Transmitting device, receiving device and method thereof

Abstract

The present invention relates to a transmitting device (100) and a receiving device (300) of a wireless communication system (500). The transmitting device is used to transmit one or more synchronization signals on a carrier to at least one receiving device, wherein the frequency of the synchronization signal in the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is arranged on a second frequency grid, and the frequencies of two different synchronization signals in the one or more synchronization signals are located at different frequency positions in the first grid; and to transmit an indication of the carrier frequency to at least one receiving device (300), wherein the indication includes at least one integer. The receiving device (300) is used to obtain the carrier frequency based on the at least one integer. In addition, the present invention also relates to a corresponding method and a computer program.

Description

Technical Field

[0001] The invention relates to a transmitting device and a receiving device. In addition, the invention also relates to a corresponding method and a computer program. Background Art

[0002] In 3GPP New Radio (NR), the Synchronization Signal (SS) block includes the NR-Primary Synchronization Signal (NR-PSS), the NR-Secondary Synchronization Signal (NR-SSS), and the NR-Physical Broadcast Channel (NR-PBCH). After detecting the synchronization signal block, the user equipment (UE) can synchronize with the cell and obtain the cell ID and broadcast information of the cell. The broadcast information, such as the NR-Master Information Block (NR-MIB), may further include information that enables the UE to detect the NR-Physical Downlink Shared Channel (NR-PDSCH) to obtain system information, such as the remaining system information (RMSI) and other system information (OSI). NR-PBCH may include information about control channel resources on which the UE may detect the NR-Physical Downlink Control Channel (NR-PDCCH) that schedules RMSI via NR-PDSCH. NR-PBCH should be received over a large coverage area, so its payload should be minimized. Additional system information may be included in RMSI or OSI.

[0003] In 3GPP NR, the synchronization signal block is located on a frequency grid (e.g., the center frequency of the SS block or SS is located on the grid), and the frequency grid is a set of frequencies with predefined intervals between them. The frequency grid used for the synchronization signal block (represented herein as the synchronization signal grid) may be different from the frequency grid used for the NR channel (represented herein as the NR channel grid). The NR channel grid defines the carrier frequency (e.g., the center frequency of the carrier) that can be used to deploy the NR carrier. The carrier should be understood as an entity of a communication system that includes channels and signals for communication, and the carrier can be deployed in downlink and uplink communications.

[0004] The synchronization signal grid and the NR channel grid can be selected for different purposes. Therefore, in order to reduce the search complexity of the UE, the synchronization signal grid can be, for example, sparser than the NR channel grid. At least for the initial cell selection, the UE searches for the synchronization signal on the synchronization signal grid. The synchronization signal grid can be, for example, a multiple of 15kHz, which is the subcarrier spacing (SCS) in NR, such as 300kHz or 900kHz. The NR system will provide different SCSs, for example, SS can use SCSs of 15, 30, 120 or 240kHz. Additional SCSs such as 60kHz are applicable to other channels and signals. In addition, the synchronization signal grid can be different in different frequency bands, for example, it can be 100kHz in the frequency bands where LTE and NR should coexist. Similarly, the NR channel grid can be different in different frequency bands, for example, it can be 100kHz in the frequency bands where LTE and NR should coexist, and may present larger values ​​in high frequency bands with larger spectrum amounts.

[0005] If the sync signal grid and the NR channel grid are different, then it can be considered that the sync signal block is not located near the center frequency of the NR carrier, such as the carrier frequency. In addition, the NR carrier may include multiple sync signal blocks sent at different frequency positions. Thus, the sync signal grid may give a sync signal frequency position that is a subset of the channel frequency, or that is not aligned at all with the channel frequency, or that is partially aligned with the channel frequency.

[0006] In the legacy system 3GPP LTE, the synchronization signal is located near the center frequency of the carrier, and the synchronization signal grid is the same as the channel grid. Therefore, the UE can implicitly determine the carrier frequency from the frequency position of the detected synchronization signal. The carrier frequency information allows the UE to achieve one or more of the following non-limiting tasks:

[0007] Tune the oscillator to the carrier frequency.

[0008] Perform receiver filtering.

[0009] • Mobility measurements are made on cells characterized by cell ID and carrier frequency.

[0010] Detect multiple synchronization signal blocks and determine which carrier the multiple synchronization signal blocks belong to.

[0011] Determine the location of the physical resource blocks (PRBs) of the carrier.

[0012] Determine the location of the reference signal (RS).

[0013] Receive system information.

[0014] On the other hand, in 3GPP NR, the UE will not be able to implicitly determine the carrier frequency from the detected synchronization signal blocks, because the synchronization signal grid and the NR channel grid may be different. Therefore, there is a question of how to determine the NR carrier frequency in 3GPP NR. Summary of the invention

[0015] It is an object of embodiments of the present invention to provide a solution that alleviates or solves the drawbacks and problems of conventional solutions.

[0016] According to a first aspect of the present invention, the above-mentioned object and other objects are achieved by a sending device of a wireless communication system, wherein the sending device is used for:

[0017] Sending one or more synchronization signals on a carrier to at least one receiving device, wherein the frequency of a synchronization signal of the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is deployed on a second frequency grid, and the frequencies of two different synchronization signals of the one or more synchronization signals are located at different frequency positions in the first grid; and

[0018] An indication of the carrier frequency is sent to at least one receiving device, wherein the indication comprises at least one integer.

[0019] In an implementation of the first aspect, the frequency band in which the carrier is located includes values ​​determined from the first grid and the second grid, wherein the values ​​represent frequency positions.

[0020] The frequency grid in the present disclosure may be understood as a set of frequencies with predetermined intervals between them. A first frequency grid may or may not be aligned with a second frequency grid. A frequency grid may depend on frequency, i.e., different frequency grids may be used in different frequency bands.

[0021] According to the transmitting device of the first aspect, it is related to the case that more than one synchronization signal may exist in the carrier. In this case, the synchronization signals are located at different frequency positions on the first frequency grid. However, this does not exclude the case where there is only one synchronization signal in the carrier. It should also be noted that there may be multiple types of synchronization signals, such as primary synchronization signals, secondary synchronization signals, etc. Therefore, in this article, one or more synchronization signals may include different types of synchronization signals. It should also be understood that more than one synchronization signal is provided on the carrier, and the case where these multiple synchronization signals are located at different frequency positions on the first frequency grid includes the following cases: a synchronization signal may include different types of synchronization signals (e.g., NR-PSS and NR-SSS), which are separated in time (e.g., in different OFDM symbols) but use the same frequency position (i.e., the same grid value). Therefore, an example is that the first pair of synchronization signals NR-PSS_1 and NR-SSS_1 have the same frequency position, which is different from the frequency position of one synchronization signal in the second pair of synchronization signals NR-PSS_2 and NR-SSS_2. In addition, it should be understood that the carrier may also only include the first pair of synchronization signals NR-PSS_1 and NR-SSS_1 having the same frequency position.

[0022] It should also be noted that the carrier frequency may be equal to or not equal to the center frequency of the carrier. For a receiving device that cannot receive a broadband carrier, transmission and / or reception may be performed on a portion of the carrier. This portion of the broadband carrier may be regarded as a carrier of a certain receiving device, wherein its carrier frequency is limited to this portion of the broadband carrier, and this portion of the broadband carrier may not be the center frequency of the carrier.

[0023] The transmitting device according to the first aspect provides a number of advantages over conventional solutions. The transmitting device is advantageous in that it allows the receiving device to determine the carrier frequency and potentially the frequency position of the synchronization signal within the carrier and one or both of the PRB and the reference signal (RS) frequency positions.

[0024] In an implementation of the transmitting device according to the first aspect, the frequency of the synchronization signal is a center frequency of the synchronization signal or a carrier. In an example, the center frequency and the carrier frequency are different frequencies.

[0025] In an implementation manner of the transmitting device according to the first aspect, the at least one integer is a channel number.

[0026] The advantage of this implementation is that it reduces the signaling overhead for indicating the carrier frequency, since the mapping between the carrier frequency and the channel number is known. Furthermore, the carrier frequency can be uniquely determined from the channel number.

[0027] In an implementation manner of the transmitting device according to the first aspect, the channel number is associated with a unique carrier frequency.

[0028] The advantage of this implementation is that it provides a simple way to clearly determine the carrier frequency, thereby reducing the complexity of the receiver.

[0029] In an implementation of the transmitting device according to the first aspect, the frequency spectrum of the wireless communication system is divided into a plurality of non-overlapping frequency bands, and the channel number is associated with a unique carrier frequency in the frequency band.

[0030] An advantage of this implementation is that fewer bits are required to encode the information about the carrier frequency, since the range of channel number values ​​can be reduced.

[0031] In an implementation manner of the transmitting device according to the first aspect, the range of the channel number depends on the frequency band.

[0032] The advantage of this implementation is that the signaling overhead of the channel number can be reduced. For example, in a frequency band where there is a large amount of available spectrum, the frequency grid may contain fewer frequencies and therefore fewer channel numbers.

[0033] In an implementation manner of the transmitting device according to the first aspect, a frequency interval between two adjacent synchronization signals is a multiple of a subcarrier interval of a wireless communication system, and the first frequency grid is a subset of the second frequency grid.

[0034] The advantage of this implementation is that the synchronization signal is aligned with the subcarriers of other channels and the signals of the carrier.

[0035] In an implementation manner of the transmitting device according to the first aspect, the at least one integer is a relative channel number.

[0036] The advantage of this implementation is that the overhead of sending carrier frequency can be further reduced.

[0037] In an implementation manner of the transmitting device according to the first aspect, the relative channel number depends on a maximum carrier bandwidth of the wireless communication system.

[0038] The advantage of this implementation is that, considering that the synchronization signal cannot be located further away from the carrier frequency than the maximum carrier bandwidth, the overhead of sending the carrier frequency can be further reduced.

[0039] In an implementation manner of the transmitting device according to the first aspect, the range of the relative channel number depends on the maximum carrier bandwidth.

[0040] The advantage of this implementation is that, considering that the synchronization signal cannot be located further away from the carrier frequency than the maximum carrier bandwidth, the overhead of sending the carrier frequency can be further reduced.

[0041] In an implementation manner of the transmitting device according to the first aspect, the maximum carrier bandwidth depends on the frequency.

[0042] An advantage of this implementation is that a wider carrier bandwidth is provided only in frequency bands where there is a large amount of available spectrum.

[0043] In an implementation of the transmitting device according to the first aspect, the at least one integer is a first index and a second index, the first index indicates a first frequency position relative to the frequency of the synchronization signal, and the second index indicates a second frequency position relative to the first frequency position.

[0044] The advantage of this implementation is that the overhead of sending carrier frequency can be further reduced.

[0045] In an implementation of the transmitting device according to the first aspect, the first frequency position is given in the number of physical resource blocks, and the second frequency position is given in the resolution of a second frequency grid.

[0046] The advantage of this implementation is that the overhead of transmitting the carrier frequency can be further reduced, and the synchronization signal can be aligned with other channels and signals located in the resource block in terms of frequency position.

[0047] In an implementation of the transmitting device according to the first aspect, the first frequency position is given with a resolution of the first frequency grid, and the second frequency position is given with a resolution of the second frequency grid.

[0048] The advantage of this implementation is that, considering that the first grid may be more sparse than the second grid, the overhead of transmitting the carrier frequency can be further reduced.

[0049] In an implementation of the sending device according to the first aspect, the sending device (100) is further configured to:

[0050] The indication is sent in at least one of: a master information block (MIB), residual system information (RMSI), other system information (OSI), and radio resource control (RRC).

[0051] One advantage of this implementation is that the signal is transmitted in a channel that has the ability to contain more information, namely information about what the synchronization signal can do. The encoding of the additional information in the synchronization signal increases the complexity of the receiver because it is usually based on the synchronization sequence, while the MIB, RMSI, OSI and RRC signaling are carried in a channel that is more suitable for information transmission.

[0052] According to a second aspect of the present invention, the above-mentioned object and other objects are achieved by a receiving device of a wireless communication system, the receiving device being used for:

[0053] Receiving one or more synchronization signals on a carrier from a transmitting device, wherein the frequency of a synchronization signal in the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is deployed on a second frequency grid, and the frequencies of two different synchronization signals in the one or more synchronization signals are located at different frequency positions in the first grid;

[0054] receiving an indication of a carrier frequency from a transmitting device, wherein the indication comprises at least one integer; and

[0055] The carrier frequency is obtained based on the at least one integer.

[0056] In an implementation manner of the second aspect, the frequency band in which the carrier is located includes values ​​determined from the first grid and the second grid.

[0057] The receiving device according to the second aspect provides a number of advantages over conventional solutions. One advantage is that it allows the receiving device to determine the carrier frequency and potentially the frequency position of the synchronization signal within the carrier and one or both of the PRB and Reference Signal (RS) frequency positions.

[0058] In an implementation of the receiving device according to the second aspect, the frequency spectrum of the wireless communication system is divided into a plurality of non-overlapping frequency bands, and the at least one integer is associated with a frequency band, and the receiving device is further configured to:

[0059] The at least one integer is mapped based on a frequency band to derive a carrier frequency.

[0060] According to a third aspect of the present invention, the above-mentioned object and other objects are achieved by a method of sending a device, the method comprising:

[0061] Sending one or more synchronization signals on a carrier to at least one receiving device, wherein a frequency of a synchronization signal of the one or more synchronization signals is located on a first frequency grid, a carrier frequency of the carrier is deployed on a second frequency grid, and frequencies of two different synchronization signals of the one or more synchronization signals are located at different frequency positions in the first grid; and

[0062] An indication of the carrier frequency is sent to the at least one receiving device, wherein the indication comprises at least one integer.

[0063] In an implementation of the third aspect, the frequency band in which the carrier is located includes values ​​determined from the first grid and the second grid.

[0064] In an implementation of the third aspect, the method further includes obtaining at least one synchronization signal before sending the at least one synchronization signal.

[0065] The method according to the third aspect can be extended to an implementation corresponding to the implementation of the sending device according to the first aspect. Therefore, the implementation of the method includes the features of the corresponding implementation of the sending device.

[0066] The advantages of the method according to the third aspect are the same as the advantages of the corresponding device according to the first aspect.

[0067] According to a fourth aspect of the present invention, the above-mentioned object and other objects are achieved by a method of a receiving device, the method comprising:

[0068] Receiving one or more synchronization signals on a carrier from a transmitting device, wherein the frequency of a synchronization signal in the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is deployed on a second frequency grid, and the frequencies of two different synchronization signals in the one or more synchronization signals are located at different frequency positions in the first grid;

[0069] receiving an indication of a carrier frequency from a transmitting device, wherein the indication comprises at least one integer; and

[0070] The carrier frequency is obtained based on the at least one integer.

[0071] In an implementation of the fourth aspect, the frequency band in which the carrier is located includes values ​​determined from the first grid and the second grid.

[0072] The method according to the fourth aspect can be extended to an implementation corresponding to the implementation of the receiving device according to the second aspect. Therefore, the implementation of the method includes the features of the corresponding implementation of the receiving device.

[0073] The advantages of the method according to the fourth aspect are the same as the advantages of the corresponding device according to the second aspect.

[0074] The invention also relates to a computer program, represented in code, which, when run by a processing device, causes the processing device to perform any method according to the invention. Furthermore, the invention also relates to a computer program product comprising a computer readable medium and said computer program, wherein the computer program is included in the computer readable medium and comprises one or more of the following group: ROM (Read Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), Flash memory, EEPROM (Electronic EPROM) and hard disk drive.

[0075] Further applications and advantages of the present invention will be apparent from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The accompanying drawings are intended to illustrate and explain different embodiments of the present invention, in which:

[0077] Figure 1 A sending device according to an implementation of the present invention is shown;

[0078] Figure 2 A method according to an implementation mode of the present invention is shown;

[0079] Figure 3 A receiving device according to an implementation of the present invention is shown;

[0080] Figure 4 Another method according to the implementation of the present invention is shown;

[0081] Figure 5 A wireless system according to an implementation of the present invention is shown;

[0082] Figure 6 shows an enumeration of carrier frequencies according to an implementation of the present invention;

[0083] Figure 7 An indication of a carrier frequency by using a first index and a second index according to an implementation of the present invention is shown;

[0084] Figure 8(a) and 8(b) A PRB grid within a frequency band according to an implementation of the present invention is shown. DETAILED DESCRIPTION

[0085] Figure 1 FIG. 1 shows a sending device 100 according to an implementation of the present invention. Figure 1 In the illustrated implementation, the transmitting device 100 includes a processor 102, a transceiver 104, and a memory 106. The processor 102 is coupled to the transceiver 104 and the memory 106 via a communication device 108 known in the art. The transmitting device 100 can be used for wireless and wired communications in wireless and wired communication systems, respectively. An antenna 110 coupled to the transceiver 104 has wireless communication capabilities, and a wired communication interface 112 coupled to the transceiver 104 has wired communication capabilities.

[0086] In the present disclosure, the sending device 100 is used to perform certain actions and / or functions according to the present invention. It should be understood that the sending device 100 includes appropriate devices for performing the actions and / or functions, such as a processor 102 and a transceiver 104.

[0087] Figure 1The transmitting device 100 in the embodiment is used to transmit one or more synchronization signals (synchronization signal, SS) on a carrier to at least one receiving device 300, wherein the frequency of the synchronization signal in the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is deployed on a second frequency grid, and the frequencies of two different synchronization signals in the one or more synchronization signals are located at different frequency positions in the first grid. The transmitting device 100 is also used to send an indication of the carrier frequency to at least one receiving device 300. The indication here includes at least one integer.

[0088] Figure 2 It shows that it can be Figure 1 Flowchart of a corresponding method 200 executed in the sending device 100 shown. The method 200 includes 202: sending one or more synchronization signals on a carrier to at least one receiving device 300, wherein the frequency of the synchronization signal in the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is deployed on a second frequency grid, and the frequencies of two different synchronization signals in the one or more synchronization signals are located at different frequency positions in the first grid. The method also includes 204: sending an indication of the carrier frequency to at least one receiving device 300. The indication includes at least one integer.

[0089] Figure 3 FIG. 3 shows a receiving device 300 according to an implementation of the present invention. Figure 3 In the illustrated implementation, the receiving device 300 includes a processor 302, a transceiver 304, and a memory 306. The processor 302 is coupled to the transceiver 304 and the memory 306 via a communication means 308 known in the art. The receiving device 300 also includes an antenna 310 coupled to the transceiver 304, which means that the receiving device 300 is used for wireless communication in a wireless communication system.

[0090] In the present disclosure, the receiving device 300 is used to perform certain actions and / or functions according to the present invention. It should be understood that the receiving device 300 includes appropriate devices for performing the actions and / or functions, such as a processor 302 and a transceiver 304.

[0091] The receiving device 300 is used to receive one or more synchronization signals on a carrier from the transmitting device 100, wherein the frequency of the synchronization signal in the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is deployed on a second frequency grid, and the frequencies of two different synchronization signals in the one or more synchronization signals are located at different frequency positions in the first grid. The receiving device 300 is also used to receive an indication of the carrier frequency from the transmitting device 100, wherein the indication includes at least one integer. The receiving device 300 is also used to obtain the carrier frequency based on the at least one integer. An example of how to obtain the carrier frequency based on the at least one integer is explained in the following disclosure.

[0092] Figure 4 It shows that it can be Figure 3 Flowchart of a corresponding method 400 executed in the receiving device 300 shown. The method 400 includes 402: receiving one or more synchronization signals on a carrier from the transmitting device 100, wherein the frequency of the synchronization signal in the one or more synchronization signals is located on a first frequency grid, the carrier frequency of the carrier is deployed on a second frequency grid, and the frequencies of two different synchronization signals in the one or more synchronization signals are located at different frequency positions in the first grid. The method 400 also includes 404: receiving an indication of the carrier frequency from the transmitting device 100, wherein the indication includes at least one integer. The method 400 also includes 406: obtaining the carrier frequency based on the at least one integer.

[0093] Figure 5 A wireless communication system 500 according to an implementation of the present invention is shown. The wireless communication system 500 includes a transmitting device 100 and a receiving device 300 for operating in the wireless communication system 500. In this example, a downlink (DL) situation is shown, which means that the transmitting device 100 is part of a network node (such as a base station) and the receiving device 300 is part of a client device (such as a UE). In the wireless communication system 500, a synchronization signal (SS) is transmitted by the transmitting device 100 and received by the receiving device 300. For simplicity, Figure 5 The wireless communication system 500 shown includes only one transmitting device 100 and one receiving device 300. However, the wireless communication system 500 may include any number of transmitting devices and any number of receiving devices without departing from the scope of the present invention.

[0094] It should be noted that the present solution is not limited to the downlink case, and thus can be implemented in the uplink (UL), or in both the downlink and the uplink.Thus, depending on the implementation, the transmitting device 100 and the receiving device 300 can be associated with a network node and / or a client device.

[0095] In one example, the frequency spectrum of the wireless communication system 500 is divided into a plurality of non-overlapping frequency bands, and at least one integer is associated with the frequency band. In this case, the receiving device 300 is configured to map the at least one integer based on the frequency band to obtain a carrier frequency.

[0096] The indication of the carrier frequency herein can be sent by the transmitting device 100 to the receiving device 300 using several different methods, for example, depending on when the receiving device 300 needs to know the carrier frequency during the access process. Therefore, the transmitting device 100 is configured to send the indication in at least one of the following: a master information block (MIB), residual system information (RMSI), other system information (OSI), and radio resource control (RRC).

[0097] MIB provides the fastest way to transmit carrier frequency information in the broadcast channel. On the other hand, it is helpful to minimize the payload of the broadcast channel.

[0098] The RMSI may be included in the NR-PDSCH scheduled by the NR-PDCCH, where information about the configuration of the NR-PDCCH / NR-PDSCH is included in the NR-MIB. If the carrier frequency information is included in the RMSI, it means that the RMSI should be detectable without knowing the carrier frequency. Therefore, the resources in the NR-PDCCH / NR-PDSCH used to determine the RMSI should not depend on the carrier frequency, but can be determined from the NR-SS and / or NR-PBCH.

[0099] The OSI may be included in the NR-PDSCH scheduled by the NR-PDCCH, where information related to the configuration of the NR-PDCCH / NR-PDSCH is included in the NR-MIB and / or RMSI. If the carrier frequency information is included in the OSI, it means that the OSI should be detectable without knowing the carrier frequency. Therefore, the resources in the NR-PDCCH / NR-PDSCH used to determine the OSI should not depend on the carrier frequency, but can be determined from the NR-SS and / or NR-PBCH.

[0100] The present invention is also applicable if the indication of the carrier frequency is sent jointly through any combination of NR-MIB, RMSI and OSI.

[0101] When RRC signaling is used to send signals and the carrier frequency is used to define the cell in the higher layer for mobility measurement, the cell description including the cell ID and the carrier frequency can be sent by RRC. In this case, since the RRC signaling is carried by NR-PDSCH, the overhead of sending the carrier frequency is less important.

[0102] In the following, possible implementations of the present invention are described and explained. In this regard, consider a wireless communication system 500, wherein the synchronization signal may be placed in a first frequency grid {f SS,i} (i.e., a set of frequencies), resulting in a minimum separation of |f SS,i -f SS,i+1 |=Δf SS Hz, and the carrier can be placed on the second frequency grid {f C,i}, resulting in a minimum interval of |f C,i -f C,i+1 |=Δf C In such a system, the first frequency grid and the second frequency grid may depend on the frequency band, ie, the value Δf representing the frequency interval SS (f SS,i ) and Δf C (f C,i ) may not be a constant and may be a function of frequency. However, it should be noted that the present invention is not limited to wireless communication systems of the above type.

[0103] In one implementation of the present invention, the carrier frequency is represented by the channel number C. In this case, the mapping from the channel number to the carrier frequency, C→f C,i , may be predefined and known to the receiving device 300. For example, the mapping may be performed using a closed-form expression, such as: DL =F DL_low +Δf C (CN offs_DL ), where the constant F DL_low and N offs_DL can be predefined and F DL =f C,i .

[0104] In one implementation, the N channel frequencies It can be enumerated according to 0≤C≤N-1. In this case, it is not required that the synchronization signal frequency position is a subset of the channel frequency, that is, On the other hand, this implementation does not exclude that the synchronization signal frequency position is a subset of the channel frequency.

[0105] In one example, when the carrier frequency is represented as a channel number C, a single enumeration is applied across all frequency bands, which means that each channel number is associated with a unique carrier frequency. That is, the mapping of channel number to carrier frequency C→f C,i is a one-to-one mapping, and each value of the channel number C is associated with a unique frequency f C,i This is implemented in Figure 6The top axis of FIG. 1 is shown in FIG. 2 , where the frequency band is divided into two bands, namely, band A and band B, and 8 carrier frequencies are shown. In the top axis, a single enumeration is applied, so 3 bits are required to represent the carrier frequency. This provides a simple way to unambiguously determine the carrier frequency, but requires a channel number set of size N to include all carrier frequencies of the system. The mapping can be band specific and predefined, for example, F DL =F DL_low +Δf C (C)(CN offs_DL ), where the grid value is a function of the channel number, i.e., Δf C (C).

[0106] In another example, when the carrier frequency is represented as a channel number C, multiple enumerations are applied across all frequency bands. This can be achieved by dividing the spectrum into predefined non-overlapping frequency bands and performing enumeration independently for each frequency band. Thus, the spectrum of the wireless communication system 500 is divided into multiple non-overlapping frequency bands, wherein the channel number C is associated with a unique carrier frequency in the frequency band.

[0107] Therefore, the mapping from channel number to carrier frequency C→f C,i is a one-to-many mapping, and each value of the channel number C can be associated with more than one frequency f C,i However, this still provides a unique mapping C→f for the receiving device 300 C,i , because the receiving device 300 knows in which frequency band it is detecting the synchronization signal block. However, it should be noted that the mapping may be different in different frequency bands, for example, the mapping may be frequency band specific and predefined, for example, F DL =F DL_low +Δf C (C)(CN offs_DL ), where the grid value is a function of the channel number, Δf C (C). This is achieved in Figure 6, where the enumeration is repeated for each band A and band B. Therefore, 2 bits are required to represent the carrier frequency in this case. The advantage of this is that fewer bits are required to encode information about the carrier frequency, for example, when N frequency positions are divided into M frequency bands, it is reduced from log2N bits to log2(N / M) bits. One purpose of this is to minimize the number of bits required to indicate the carrier frequency, because the number of carrier frequencies can be very large, and for a given channel, a larger signaling overhead results in smaller area coverage (i.e., a higher code rate). Area coverage is particularly important for channels used for initial access, such as synchronization signals, broadcast signals, and channels used to transmit system information. When the carrier frequency is used together with the cell ID, for example, to define a measurement object, further information about the specified frequency band may be required so that the receiving device 300 can uniquely determine the correct carrier frequency.

[0108] In one implementation, the channel number C can be indicated using log2SC bits in the MIB, where SC is the total number of subcarriers in a given frequency band. This provides maximum deployment flexibility at the expense of signaling overhead.

[0109] Other possible implementations of the present invention are applicable when the frequency spacing between two adjacent synchronization signals is a multiple of the subcarrier spacing of the wireless communication system 500, and the first frequency grid is a subset of the second frequency grid. In other words, the distance Δf between the frequency positions of two adjacent synchronization signals is SS is a multiple of the subcarrier spacing (SCS) supported by the wireless communication system 500. In addition, the synchronization signal frequency position is a subset of the channel frequency, that is, Here, the multiple of SCS can include the distance Δf between the frequency positions of two synchronization signals. SS is n times the PRB bandwidth B (also a multiple of SCS) for a given SCS, Δf SS =n·B, where n is a positive integer.

[0110] In one implementation, when the above assumption holds, it is disclosed herein that the relative channel number ΔC is used to indicate the carrier frequency, that is, -(N-1)≤ΔC≤N-1. In this case, the receiving device 300 detects the synchronization signal block frequency position f SS,i The synchronization signal block frequency position is located on the channel grid and determines the relative carrier frequency ΔC→Δf based on a predefined mapping rule C,i For example, Δf C,i It can be the carrier frequency grid Δf C =|f C,i -f C,i+1 The carrier frequency is derived based on the above relative channel number, f SS,i +ΔfC,i .because It follows from this The number of bits representing the relative channel number may be log2(2N+1), where N is the number of synchronization signal frequencies.

[0111] In another implementation, when the above assumption holds, it is disclosed herein that the relative channel number ΔC is used to indicate the carrier frequency, that is, -(N-1)≤ΔC≤N-1. In this case, the receiving device 300 is informed of the frequency position f WB , the frequency position is located on the channel grid and determines the relative carrier frequency ΔC→Δf based on a predefined mapping rule C,i For example, Δf C,i It can be the carrier frequency grid Δf C =|f C,i -f C,i+1 The carrier frequency is derived based on the above relative channel number, f WB +Δf C,i Because f WB ∈{f C,i}, it follows that The number of bits representing the relative channel number may be log2(2N+1), where N is the number of channel grids in the frequency band.

[0112] One advantage that can be appreciated is that the number N, i.e. the maximum number of carrier frequencies that can be located within a carrier, can be determined from the maximum carrier bandwidth. It can be appreciated that this provides a minimum value for N, since the carrier frequencies cannot be located further from the synchronization signal block frequency relative to the carrier bandwidth. For example, assuming the maximum carrier bandwidth is WHz, it follows that By rounding up, represents the smallest integer greater than x. Furthermore, the maximum carrier bandwidth may depend on the frequency band, for example, a very wide carrier may be used in a higher frequency band. Moreover, the second grid may be different in different frequency bands. Thus, the number N may depend on the frequency, for example,

[0113] If other constraints are assumed in addition to the requirement to be placed on the first grid and the requirement to be placed on the location of the synchronization signal block within the carrier, the number N can be further reduced. For example, assuming that the carrier frequency is the same as the synchronization channel block frequency f SS,i The distance cannot exceed XHz (where X is less than the maximum carrier bandwidth), so

[0114] The number N may then be enumerated in a single manner and obtained based on all synchronization signal frequencies in the wireless communication system 500 .

[0115] In another case, the number N can be multiple enumerated. This is achieved by dividing the spectrum into predefined non-overlapping frequency bands and performing the enumeration independently for each band. Thus, the mapping ΔC → Δf C,i is a one-to-many mapping, and each value ΔC can be associated with more than one frequency Δf C,i However, this still provides a unique mapping ΔC→f for the receiving device 300 C,i , because the receiving device 300 knows in which frequency band it is detecting the synchronization signal block. This has the advantage that fewer bits are needed to encode the information about the carrier frequency, for example, when N frequency positions are divided into M frequency bands, from log2(2N+1) bits to log2(2N / M) bits. When the carrier frequency is used together with the cell ID, for example, to define a measurement object, further information about the specified frequency band may be required so that the receiving device 300 can uniquely determine the correct carrier frequency.

[0116] In another implementation of the present invention, when the above assumption is established, a first index and a second index are used to indicate the carrier frequency. The first index indicates a first frequency position relative to the frequency position of the synchronization signal, and the second index indicates a second frequency position relative to the first frequency position indicated by the first index.

[0117] In a possible implementation of the present invention, the first frequency position is given as the number of PRBs or the resolution of the first frequency grid. Therefore, the second frequency position is given as the resolution of the second frequency grid. The resolution of the grid here refers to the frequency interval between two adjacent frequencies of the grid.

[0118] In one implementation of this implementation, it is assumed that for a given SCS, the distance Δf between the frequency positions of two synchronization signals is SS is n times the PRB bandwidth B, Δf SS =n·B, where n is a positive integer. Therefore, the first index -(M-1)≤δ≤M-1 determines the offset relative to the detected synchronization signal frequency position, where the carrier frequency is located at the synchronization signal frequency position, for example, the offset is expressed in PRB bandwidth step B or first frequency grid step (also expressed as SS grid step, or SS grid resolution). In one implementation, the value M determines the PRB or first frequency grid step Δf applicable to the frequency band SS In another implementation, the value M determines the PRB or first frequency grid step size Δf applicable to the above maximum carrier bandwidth. SSIt will be appreciated that this can reduce the value of M, since the distance between the synchronization signal and the carrier frequency cannot be greater than the maximum carrier bandwidth (which may depend on the frequency band). The second index provides the location of the carrier frequency within the PRB or within the frequency region defined by two consecutive synchronization signal frequencies. For example, Figure 7 In the case of a sync signal block, the carrier frequency is located at a distance of 100 km from the detected sync signal block frequency (i.e., f SS,i ) 3 PRBs (second index), and the carrier frequency is located at a second carrier frequency (first index) at a distance from the position obtained from the first index. Assuming that the first index has a step size or granularity greater than the second frequency grid, and assuming the distance, the above-mentioned synchronization signal block frequency at which the above-mentioned carrier frequency can be located, there is a limit on how many PRBs or how many synchronization signal grid positions there are, for example, limited by the maximum carrier bandwidth, which makes it possible to reduce the number of bits used to represent the carrier frequency.

[0119] A consequence of the present invention is that once the receiving device 300 determines the carrier frequency, the receiving device 300 can determine the PRB frequency position and / or RS frequency position within the carrier, assuming that their frequency positions are associated with the carrier frequency. For example, if the system bandwidth is sent to the receiving device 300 using the carrier frequency as well as the system bandwidth, the PRB position within the carrier frequency band can be determined. For each system bandwidth, one PRB position is determined.

[0120] In one example, if the total number of PRBs in band Z is an odd number, the center frequency of PRB#(Z+1) / 2 is aligned with the carrier frequency. In this case, the PRB positions are as shown in FIG8(a). If the total number of PRBs in band (Z) is an even number, the carrier frequency is located between PRB#(Z / 2) and PRB#(Z / 2+1), and the PRBs are located as shown in FIG8(b).

[0121] The advantage of aligning PRBs within a carrier according to a given frequency (such as the above-mentioned carrier frequency) is that the PRBs of multiple carriers become aligned in frequency position. This enables the use of inter-cell interference coordination techniques.

[0122] Depending on the technology and terminology used, the network node in this article can also be represented as a radio network node, an access network node, an access point or a base station, such as a radio base station (Radio Base Station, RBS). In some networks, the radio base station can be called a transmitter, "eNB", "eNodeB", "NodeB" or "B node". Radio network nodes can have different categories based on transmission power and cell size, such as macro eNodeB, home eNodeB or micro base station. A radio network node can be a station (Station, STA), which is any device that includes IEEE 802.11-Media Access Control (MAC) and Physical Layer (PHY) interfaces that comply with the Wireless Medium (WM). A radio network node can also be a base station corresponding to a fifth generation (5G) wireless system.

[0123] The client device herein may be represented as a user device, user equipment (UE), mobile station, internet of things (IoT) device, sensor device, wireless terminal and / or mobile terminal, which is capable of wireless communication in a wireless communication system (sometimes also referred to as a cellular wireless system). UE may also refer to a mobile phone, a cellular phone, a computer tablet or a laptop computer with wireless capabilities. The UE in the context of the present disclosure may be, for example, a portable, pocket-storable, handheld, computer-contained or vehicle-mounted mobile device, which is capable of communicating voice and / or data with another entity (e.g., another receiver or server) through a wireless access network. The UE may be a station (STA), which is any device that includes IEEE 802.11-Media Access Control (MAC) and Physical Layer (PHY) interfaces that comply with the Wireless Medium (WM). The UE may also be used for communications in 3GPP-related LTE and LTE-Advanced, WiMAX and its evolution, and fifth-generation wireless technologies (e.g., new wireless).

[0124] In addition, any method according to an embodiment of the present invention can be implemented in a computer program having a code device, which causes the processing device to perform the steps of the method when it is run by a processing device. The computer program is included in a computer-readable medium of a computer program product. The computer-readable medium can basically include any memory, for example, a ROM (read-only memory), a PROM (programmable read-only memory), an EPROM (erasable PROM), a flash memory, an EEPROM (electrically erasable PROM), or a hard disk drive.

[0125] Furthermore, it is recognized by those skilled in the art that the network nodes and the client devices include necessary communication capabilities in the form of functions, means, units, elements, etc., for performing the present solution. Examples of other such means, units, elements and functions are: processors, memories, buffers, control logic, encoders, decoders, rate matchers, de-rate matchers, mapping units, multipliers, decision units, selection units, switches, interleavers, de-interleavers, modulators, demodulators, inputs, outputs, antennas, amplifiers, receiver units, transmitter units, DSPs, MSDs, TCM encoders, TCM decoders, power supply units, feeding devices, communication interfaces, communication protocols, etc., which are appropriately arranged together to perform the solution of the present invention.

[0126] In particular, the processors of the network nodes and client devices may include, for example, one or more instances of a central processing unit (CPU), a processing unit, a processing circuit, a processor, an application specific integrated circuit (ASIC), a microprocessor, or other processing logic that can interpret and execute instructions. Therefore, the expression "processor" may refer to a processing circuit including multiple processing circuits, such as any one, part, or all of the processing circuits mentioned above. The processing circuit may also perform data processing functions for inputting, outputting, and processing data, including data buffering and device control functions, such as call processing control, user interface control, etc.

[0127] Finally, it should be understood that the present invention is not limited to the embodiments described above.

Claims

1. A transmitting device (100) of a wireless communication system (500), the transmitting device (100) being used for: One or more synchronization signals on a carrier are transmitted to at least one receiving device (300), wherein: The frequency of the synchronization signal of the one or more synchronization signals is located on a first frequency grid, and the carrier frequency of the carrier is arranged on a second frequency grid; and sending an indication of the carrier frequency to the at least one receiving device (300), wherein the indication comprises at least one integer; The frequency interval between two adjacent synchronization signals is a multiple of the subcarrier interval of the wireless communication system (500), and the first frequency grid is a subset of the second frequency grid.

2. The transmitting device (100) according to claim 1, wherein: The at least one integer is a channel number.

3. The transmitting device (100) according to claim 2, wherein: The channel number is associated with a unique carrier frequency.

4. The transmitting device (100) according to claim 2 or 3, wherein: The frequency spectrum of the wireless communication system (500) is divided into a plurality of non-overlapping frequency bands, wherein the channel number is associated with a unique carrier frequency in a frequency band.

5. The transmitting device (100) according to claim 4, wherein: The range of the channel numbers depends on the frequency band.

6. The transmitting device (100) according to claim 1, wherein: The at least one integer is a relative channel number.

7. The transmitting device (100) according to claim 6, wherein: The relative channel number depends on the maximum carrier bandwidth of the wireless communication system (500).

8. The transmitting device (100) according to claim 7, wherein: The range of the relative channel numbers depends on the maximum carrier bandwidth.

9. The transmitting device (100) according to claim 7 or 8, wherein: The maximum carrier bandwidth depends on the frequency.

10. The transmitting device (100) according to claim 1, wherein: The at least one integer is a first index and a second index, the first index indicating a first frequency position relative to the frequency of the synchronization signal, and the second index indicating a second frequency position relative to the first frequency position.

11. The transmitting device (100) according to claim 10, wherein: The first frequency position is given in number of physical resource blocks and the second frequency position is given in a resolution of the second frequency grid.

12. The transmitting device (100) according to claim 10, wherein: The first frequency position is given at a resolution of the first frequency grid, and the second frequency position is given at a resolution of the second frequency grid.

13. The sending device (100) according to any one of claims 1 to 3, wherein the sending device (100) is used for: The indication is sent in at least one of: a master information block (MIB), residual system information (RMSI), other system information (OSI), and radio resource control (RRC).

14. A receiving device (300) of a wireless communication system (500), the receiving device (300) being configured to: One or more synchronization signals on a carrier are received from a transmitting device (100), wherein: The frequency of the synchronization signal in the one or more synchronization signals is located on a first frequency grid, and the carrier frequency of the carrier is arranged on a second frequency grid; receiving an indication of the carrier frequency from the transmitting device (100), wherein the indication comprises at least one integer; and obtaining the carrier frequency based on the at least one integer; The frequency interval between two adjacent synchronization signals is a multiple of the subcarrier interval of the wireless communication system (500), and the first frequency grid is a subset of the second frequency grid.

15. The receiving device (300) according to claim 14, wherein: The frequency spectrum of the wireless communication system (500) is divided into a plurality of non-overlapping frequency bands, and the at least one integer is associated with a frequency band, wherein the receiving device (300) is configured to: The at least one integer is mapped based on the frequency band to obtain the carrier frequency.

16. The receiving device (300) according to claim 14, wherein: The at least one integer is a channel number.

17. The receiving device (300) according to claim 16, wherein: The channel number is associated with a unique carrier frequency.

18. The receiving device (300) according to any one of claims 14, 16 to 17, The indication is received in at least one of: a master information block (MIB), residual system information (RMSI), other system information (OSI), and radio resource control (RRC).

19. A method (200) for wireless communication, the method comprising: Sending (202) one or more synchronization signals on a carrier to at least one receiving device (300), wherein the frequencies of the synchronization signals of the one or more synchronization signals are located on a first frequency grid and the carrier frequency of the carrier is arranged on a second frequency grid; and sending (204) an indication of the carrier frequency to the at least one receiving device (300), wherein the indication comprises at least one integer; The frequency interval between two adjacent synchronization signals is a multiple of the subcarrier interval of the wireless communication system (500), and the first frequency grid is a subset of the second frequency grid.

20. The method (200) of claim 19, wherein: The at least one integer is a channel number.

21. The method (200) of claim 20, wherein: The channel number is associated with a unique carrier frequency.

22. The method (200) according to claim 20 or 21, wherein: The frequency spectrum of the wireless communication system (500) is divided into a plurality of non-overlapping frequency bands, wherein the channel number is associated with a unique carrier frequency in a frequency band.

23. The method (200) of claim 22, wherein: The range of the channel numbers depends on the frequency band.

24. The method (200) of claim 19, wherein: The at least one integer is a relative channel number.

25. The method (200) of claim 24, wherein: The relative channel number depends on the maximum carrier bandwidth of the wireless communication system (500).

26. The method (200) of claim 25, wherein: The range of the relative channel numbers depends on the maximum carrier bandwidth.

27. The method (200) according to claim 25 or 26, wherein: The maximum carrier bandwidth depends on the frequency.

28. The method (200) of claim 19, wherein: The at least one integer is a first index and a second index, the first index indicating a first frequency position relative to the frequency of the synchronization signal, and the second index indicating a second frequency position relative to the first frequency position.

29. The method (200) of claim 28, wherein: The first frequency position is given in number of physical resource blocks and the second frequency position is given in a resolution of the second frequency grid.

30. The method (200) of claim 28, wherein: The first frequency position is given at a resolution of the first frequency grid, and the second frequency position is given at a resolution of the second frequency grid.

31. The method (200) according to any one of the preceding claims 19 to 21, The indication is sent in at least one of: a master information block (MIB), residual system information (RMSI), other system information (OSI), and radio resource control (RRC).

32. The method (200) of claim 19, wherein the frequency band in which the carrier lies comprises values ​​determined from the first frequency grid and the second frequency grid.

33. The method (200) of claim 19, further comprising obtaining at least one synchronization signal prior to transmitting the one or more synchronization signals.

34. A method (400) for wireless communication, the method comprising: Receiving (402) one or more synchronization signals on a carrier from a transmitting device (100), wherein the frequency of a synchronization signal of the one or more synchronization signals is located on a first frequency grid and the carrier frequency of the carrier is arranged on a second frequency grid; receiving (404) an indication of the carrier frequency from the transmitting device (100), wherein the indication comprises at least one integer; and obtaining (406) the carrier frequency based on the at least one integer; The frequency interval between two adjacent synchronization signals is a multiple of the subcarrier interval of the wireless communication system (500), and the first frequency grid is a subset of the second frequency grid.

35. The method (400) of claim 34, wherein: The frequency spectrum of the wireless communication system (500) is divided into a plurality of non-overlapping frequency bands, and the at least one integer is associated with a frequency band, wherein the receiving device (300) is configured to: The at least one integer is mapped based on the frequency band to obtain the carrier frequency.

36. The method (400) of claim 34, the frequency band in which the carrier lies comprises values ​​determined from the first frequency grid and the second frequency grid.

37. The method (400) of claim 34, wherein: The at least one integer is a channel number.

38. The method (400) of claim 37, wherein: The channel number is associated with a unique carrier frequency.

39. The method (400) according to any one of claims 34, 37 to 38, The indication is received in at least one of: a master information block (MIB), residual system information (RMSI), other system information (OSI), and radio resource control (RRC).

40. A computer-readable storage medium storing instructions, which, when executed on a computer, enable the computer to execute the method according to any one of claims 19 to 33 or 34 to 39.

41. A computer program product, comprising a computer program, which, when run on a computer, causes the computer to perform the method of any one of claims 19 to 33 or 34 to 39.

42. A communication system (500), comprising: A receiving device (300) according to any one of claims 14 to 18, and a transmitting device (100) according to any one of claims 1 to 13.

43. An apparatus for wireless communication, comprising: A memory (106) for storing a computer program; and A processor (102) is used to call and run the computer program from the memory to perform the method according to any one of claims 19 to 33.

44. An apparatus for wireless communication, comprising: A memory (306) for storing a computer program; and A processor (302) is used to call and run the computer program from the memory to execute the method according to any one of claims 34 to 39.

Images