Transmitting apparatus, receiving apparatus and methods 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 configured to transmit 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 raster, a carrier frequency of the carrier is deployed on a second frequency raster, and frequencies of two different synchronization signals of the one or more synchronization signals are located on different frequency locations in the first raster, and to transmit an indication of the carrier frequency to at least one receiving device (300), wherein the indication comprises at least one integer. The receiving device (300) is configured to obtain the carrier frequency based on the at least one integer. Furthermore, the present invention also relates to corresponding methods and computer programs.

Description

[0001] This application is a divisional application. The original application has the application number 201780093835.8 and the original application date is August 10, 2017. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This invention relates to a transmitting device and a receiving device. Furthermore, this invention also relates to corresponding methods and computer programs. Background Technology

[0003] 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). Upon detecting the SS block, the User Equipment (UE) can synchronize with the cell and obtain the cell ID and broadcast information. 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 Remaining System Information (RMSI) and Other System Information (OSI). The NR-PBCH can include information about control channel resources on which the UE can detect the NR-Physical Downlink Control Channel (NR-PDCCH) scheduled via the NR-PDSCH to the RMSI. The NR-PBCH should be received over a large coverage area, therefore its payload should be minimized. Additional system information can be included in the RMSI or OSI.

[0004] In 3GPP NR, synchronization signal blocks reside on frequency grids (e.g., the center frequency of an SS block or SS is located on a grid), and a frequency grid is a set of frequencies with predefined intervals between them. The frequency grid used for synchronization signal blocks (referred to herein as the synchronization signal grid) may differ from the frequency grid used for NR channels (referred herein as the NR channel grid). The NR channel grid defines the carrier frequencies (e.g., the center frequency of the carrier) that can be used to deploy NR carriers. A carrier should be understood as an entity of a communication system that includes channels and signals used for communication, and a carrier can be deployed in both downlink and uplink communication.

[0005] Synchronization signal grids and NR channel grids can be selected for different purposes. Therefore, to reduce the search complexity for the UE, the synchronization signal grid can be, for example, sparser than the NR channel grid. At least for initial cell selection, the UE searches for a synchronization signal on the synchronization signal grid. The synchronization signal grid can be, for example, a multiple of 15 kHz, which is the subcarrier spacing (SCS) in NR, such as 300 kHz or 900 kHz. The NR system will provide different SCSs; for example, SS can use SCSs of 15, 30, 120, or 240 kHz. An additional SCS of 60 kHz can be applied to other channels and signals. Furthermore, the synchronization signal grid can be different in different frequency bands; for example, it can be 100 kHz in a band where LTE and NR should coexist. Similarly, the NR channel grid can be different in different frequency bands; for example, it can be 100 kHz in a band where LTE and NR should coexist, and may exhibit larger values ​​in higher frequency bands with greater spectral density.

[0006] If the synchronization signal grid and the NR channel grid are different, it can be assumed that the synchronization signal block is not located near the center frequency of the NR carrier, such as the carrier frequency. Furthermore, the NR carrier may include multiple synchronization signal blocks transmitted at different frequency locations. Therefore, the synchronization signal grid can indicate the synchronization signal frequency location, which is a subset of the channel frequency, or the synchronization signal frequency location is completely misaligned with the channel frequency, or the synchronization signal frequency location is partially aligned with the channel frequency.

[0007] In traditional 3GPP LTE systems, 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 location of the detected synchronization signal. Carrier frequency information allows the UE to perform one or more of the following non-restricted tasks:

[0008] • Tune the oscillator to the carrier frequency.

[0009] • Perform receiver filtering.

[0010] • Mobility measurement is performed on cells characterized by cell ID and carrier frequency.

[0011] • Detect multiple synchronization signal blocks and determine which carrier each synchronization signal block belongs to.

[0012] • Determine the location of the carrier's Physical Resource Block (PRB).

[0013] • Determine the location of the reference signal (RS).

[0014] • Receive system information.

[0015] On the other hand, in 3GPP NR, the UE cannot implicitly determine the carrier frequency from the detected synchronization signal block because the synchronization signal grid and the NR channel grid may be different. Therefore, there is a problem of how to determine the NR carrier frequency in 3GPP NR. Summary of the Invention

[0016] The purpose of embodiments of the present invention is to provide a solution that mitigates or resolves the defects and problems of conventional solutions.

[0017] The above and further objectives are achieved through the solutions provided in the independent claims. Other advantageous embodiments of the invention can be found in the dependent claims.

[0018] According to a first aspect of the invention, the above and other objectives are achieved by a transmitting device of a wireless communication system, the transmitting device being configured to:

[0019] Transmitting one or more synchronization signals on a carrier to at least one receiving device, wherein the frequency of one or more synchronization signals is located on a first frequency grid, the carrier frequency is deployed on a second frequency grid, and the frequencies of two different synchronization signals are located at different frequency positions in the first grid; and

[0020] An indication of the carrier frequency is sent to at least one receiving device, wherein the indication includes at least one integer.

[0021] In one implementation of the first aspect, the frequency band in which the carrier resides includes values ​​determined from the first grid and the second grid, wherein the values ​​represent frequency positions.

[0022] The frequency grid in this disclosure can be understood as a set of frequencies spaced at predetermined intervals. A first frequency grid may or may not be aligned with a second frequency grid. The frequency grid can be frequency-dependent; that is, different frequency grids can be used in different frequency bands.

[0023] According to the transmitting device of the first aspect, the case involves a situation where more than one synchronization signal can 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 preclude the case where only one synchronization signal exists in the carrier. It should also be noted that various types of synchronization signals can exist, such as primary synchronization signals, secondary synchronization signals, etc. Therefore, in this document, one or more synchronization signals can include synchronization signals of different types. It should also be understood that the case where more than one synchronization signal is provided on the carrier, and these multiple synchronization signals are located at different frequency positions on the first frequency grid, includes the case where a synchronization signal can include synchronization signals of different types (e.g., NR-PSS and NR-SSS) that are temporally separated (e.g., in different OFDM symbols) but use the same frequency position (i.e., the same grid value). Thus, an example is a first pair of synchronization signals NR-PSS_1 and NR-SSS_1 having the same frequency position, which is different from the frequency position of one of the synchronization signals in a second pair of synchronization signals NR-PSS_2 and NR-SSS_2. Furthermore, it should be understood that the carrier may also consist only of the first pair of synchronization signals NR-PSS_1 and NR-SSS_1, which have the same frequency position.

[0024] It should also be noted that the carrier frequency may or may not be equal to the center frequency of the carrier. For receiving devices that cannot receive a wideband carrier, transmission and / or reception may be performed on a portion of the carrier. This portion of the wideband carrier can be considered as the carrier of a certain receiving device, wherein its carrier frequency is restricted within this portion of the wideband carrier, and this portion of the wideband carrier may not be the center frequency of the carrier.

[0025] The transmitting device according to the first aspect offers many advantages over conventional solutions. The advantage of the transmitting device lies in its ability to allow the receiving device to determine the carrier frequency and potentially determine the frequency position of the synchronization signal within the carrier, as well as one or both of the PRB and Reference Signal (RS) frequency positions.

[0026] In the implementation of the transmitting device according to the first aspect, the frequency of the synchronization signal is the center frequency of the synchronization signal or carrier. In one example, the center frequency and the carrier frequency are different frequencies.

[0027] In the implementation of the transmitting device according to the first aspect, the at least one integer is a channel number.

[0028] 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.

[0029] In the implementation of the transmitting device according to the first aspect, the channel number is associated with a unique carrier frequency.

[0030] The advantage of this implementation is that it provides a simple way to explicitly determine the carrier frequency, thereby reducing the complexity of the receiver.

[0031] In the implementation of the transmitting device according to the first aspect, the spectrum of the wireless communication system is divided into multiple non-overlapping frequency bands, and the channel number is associated with a unique carrier frequency in the frequency band.

[0032] The advantage of this implementation is that fewer bits are needed to encode information about the carrier frequency because the range of channel number values ​​can be reduced.

[0033] In the implementation of the transmitting device according to the first aspect, the range of the channel number depends on the frequency band.

[0034] The advantage of this implementation is that it can reduce the signaling overhead of channel numbers. For example, in a frequency band with a large amount of available spectrum, the frequency grid may contain fewer frequencies, and therefore fewer channel numbers.

[0035] In the implementation of the transmitting device according to the first aspect, the frequency interval between two adjacent synchronization signals is a multiple of the subcarrier interval of the wireless communication system, and the first frequency grid is a subset of the second frequency grid.

[0036] The advantage of this implementation is that the synchronization signal is aligned with the subcarriers of other channels and the carrier signals.

[0037] In the implementation of the transmitting device according to the first aspect, the at least one integer is a relative channel number.

[0038] The advantage of this implementation is that it can further reduce the overhead of transmitting carrier frequency.

[0039] In the implementation of the transmitting device according to the first aspect, the relative channel number depends on the maximum carrier bandwidth of the wireless communication system.

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

[0041] In the implementation of the transmitting device according to the first aspect, the range of the relative channel number depends on the maximum carrier bandwidth.

[0042] The advantage of this implementation is that, considering that the synchronization signal cannot be located further away from the carrier frequency compared to the maximum carrier bandwidth, the overhead of transmitting the carrier frequency can be further reduced.

[0043] In the implementation of the transmitting device according to the first aspect, the maximum carrier bandwidth depends on the frequency.

[0044] The advantage of this implementation is that it provides a wider carrier bandwidth only in frequency bands where there is a large amount of available spectrum.

[0045] 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 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.

[0046] The advantage of this implementation is that it can further reduce the overhead of transmitting carrier frequency.

[0047] In an implementation of the transmitting device according to the first aspect, the first frequency position is given by the number of physical resource blocks, and the second frequency position is given by the resolution of the second frequency grid.

[0048] The advantage of this implementation is that it can further reduce the overhead of transmitting carrier frequency, and the synchronization signal can be aligned with other channels and signals located in the resource block in terms of frequency position.

[0049] In an implementation of the transmitting device according to the first aspect, the first frequency position is given with the resolution of the first frequency grid, and the second frequency position is given with the resolution of the second frequency grid.

[0050] The advantage of this implementation is that, considering the first grid may be sparser than the second grid, the overhead of transmitting carrier frequency can be further reduced.

[0051] In the implementation of the transmitting device according to the first aspect, the transmitting device (100) is further configured to:

[0052] The instruction is sent in at least one of the following: Master Information Block (MIB), Remaining System Information (RMSI), Other System Information (OSI), and Radio Resource Control (RRC).

[0053] One advantage of this implementation is that the signal transmission takes place in a channel with the capability to include more information, namely, what the synchronization signal can do. Encoding the additional information in the synchronization signal increases the complexity of the receiver because it is typically based on the synchronization sequence, while MIB, RMSI, OSI, and RRC signaling are carried in channels more suitable for information transmission.

[0054] According to a second aspect of the invention, the above and other objectives are achieved by a receiving device in a wireless communication system, the receiving device being configured to:

[0055] Receive one or more synchronization signals on a carrier from a transmitting device, wherein the frequency of 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 are located at different frequency positions in the first grid.

[0056] Receive an indication of a carrier frequency from a transmitting device, wherein the indication includes at least one integer; and

[0057] The carrier frequency is obtained based on the at least one integer.

[0058] In one implementation of the second aspect, the frequency band in which the carrier resides includes values ​​determined from the first grid and the second grid.

[0059] The receiving device according to the second aspect offers several advantages over conventional solutions. One advantage is that it allows the receiving device to determine the carrier frequency and potentially determine the frequency position of the synchronization signal within the carrier, as well as one or both of the PRB and Reference Signal (RS) frequency positions.

[0060] In an implementation of the receiving device according to the second aspect, the spectrum of the wireless communication system is divided into multiple non-overlapping frequency bands, and the at least one integer is associated with a frequency band; the receiving device is further configured to:

[0061] The carrier frequency is derived by using at least one integer based on the frequency band mapping.

[0062] According to a third aspect of the present invention, a method of a transmitting device achieves the above and other objectives, the method comprising:

[0063] Transmitting one or more synchronization signals on a carrier to at least one receiving device, wherein the frequency of one or more synchronization signals is located on a first frequency grid, the carrier frequency is deployed on a second frequency grid, and the frequencies of two different synchronization signals are located at different frequency positions in the first grid; and

[0064] The carrier frequency indication is sent to the at least one receiving device, wherein the indication includes at least one integer.

[0065] In one implementation of the third aspect, the frequency band in which the carrier resides includes values ​​determined from the first grid and the second grid.

[0066] In one implementation of the third aspect, the method further includes obtaining at least one synchronization signal before sending the at least one synchronization signal.

[0067] The method according to the third aspect can be extended to an implementation corresponding to the implementation of the transmitting device according to the first aspect. Therefore, the implementation of this method includes the features of the corresponding implementation of the transmitting device.

[0068] The advantages of the method according to the third aspect are the same as the advantages of the corresponding device claims according to the first aspect.

[0069] According to a fourth aspect of the present invention, a method for achieving the above and other objectives via a receiving device is provided, the method comprising:

[0070] Receive one or more synchronization signals on a carrier from a transmitting device, wherein the frequency of 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 are located at different frequency positions in the first grid.

[0071] Receive an indication of a carrier frequency from a transmitting device, wherein the indication includes at least one integer; and

[0072] The carrier frequency is obtained based on the at least one integer.

[0073] In one implementation of the fourth aspect, the frequency band in which the carrier resides includes values ​​determined from the first grid and the second grid.

[0074] 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 this method includes the features of the corresponding implementation of the receiving device.

[0075] The advantages of the method according to the fourth aspect are the same as the advantages of the corresponding device claims according to the second aspect.

[0076] The present 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 present invention. Furthermore, the present invention relates to a computer program product comprising a computer-readable medium and the computer program therein, wherein the computer program is contained in the computer-readable medium and includes one or more of the following: ROM (Read-Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), flash memory, EEPROM (Electronic EPROM), and hard disk drive.

[0077] Further applications and advantages of the present invention will become apparent from the following detailed description. Attached Figure Description

[0078] The accompanying drawings are intended to illustrate and explain different embodiments of the invention, wherein:

[0079] Figure 1 A transmitting device according to an implementation of the present invention is shown;

[0080] Figure 2 One method according to an implementation of the present invention is shown;

[0081] Figure 3 A receiving device according to an implementation of the present invention is shown;

[0082] Figure 4 Another method of implementation according to the present invention is shown;

[0083] Figure 5 A wireless system according to an implementation of the present invention is shown;

[0084] Figure 6 An example of carrier frequencies according to an implementation of the present invention is shown;

[0085] Figure 7 An implementation according to the invention is shown by using an indication of the carrier frequency through a first index and a second index;

[0086] Figure 8 A PRB grid within a frequency band is shown according to an implementation of the present invention. Detailed Implementation

[0087] Figure 1 A transmitting device 100 according to an implementation of the present invention is shown. Figure 1In 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 communication in wireless and wired communication systems, respectively. The antenna 110 coupled to the transceiver 104 has wireless communication capability, while the wired communication interface 112 coupled to the transceiver 104 has wired communication capability.

[0088] In this disclosure, the transmitting device 100 is used to perform certain actions and / or functions according to the invention. It should be understood that the transmitting device 100 includes adapted means for performing said actions and / or functions, such as processor 102 and transceiver 104.

[0089] Figure 1 The transmitting device 100 is configured to transmit one or more synchronization signals (SS) on a carrier to at least one receiving device 300, wherein the frequency of one or more synchronization signals is located on a first frequency grid, the carrier frequency is deployed on a second frequency grid, and the frequencies of two different synchronization signals are located at different frequency positions in the first grid. The transmitting device 100 is also configured to transmit an indication of the carrier frequency to at least one receiving device 300. This indication includes at least one integer.

[0090] Figure 2 It shows that it can be done in such a way Figure 1 The flowchart illustrates a corresponding method 200 performed in the transmitting device 100. Method 200 includes 202: transmitting one or more synchronization signals on a carrier to at least one receiving device 300, wherein the frequency of one or more synchronization signals is located on a first frequency grid, the carrier frequency is deployed on a second frequency grid, and the frequencies of two different synchronization signals are located at different frequency positions within the first grid. The method further includes 204: transmitting an indication of the carrier frequency to the at least one receiving device 300. This indication includes at least one integer.

[0091] Figure 3 A receiving device 300 according to an implementation of the present invention is shown. 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 device 308 known in the art. The receiving device 300 also includes an antenna 310 coupled to the transceiver 304, meaning that the receiving device 300 is used for wireless communication in a wireless communication system.

[0092] In this disclosure, the receiving device 300 is used to perform certain actions and / or functions according to the invention. It should be understood that the receiving device 300 includes adapted means for performing said actions and / or functions, such as processor 302 and transceiver 304.

[0093] The receiving device 300 is configured to receive one or more synchronization signals on a carrier from the transmitting device 100, wherein the frequency of one 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 are located at different frequency positions in the first grid. The receiving device 300 is also configured 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 further configured to obtain the carrier frequency based on the at least one integer. Examples of how the carrier frequency is obtained based on the at least one integer are explained in the following disclosure.

[0094] Figure 4 It shows that it can be done in such a way Figure 3 The flowchart illustrates a corresponding method 400 performed in the receiving device 300. Method 400 includes 402: receiving one or more synchronization signals on a carrier from the transmitting device 100, wherein the frequency of one of the 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 are located at different frequency positions in the first grid. Method 400 further includes 404: receiving an indication of a carrier frequency from the transmitting device 100, wherein the indication includes at least one integer. Method 400 further includes 406: obtaining the carrier frequency based on the at least one integer.

[0095] Figure 5 A wireless communication system 500 according to an implementation of the present invention is illustrated. The wireless communication system 500 includes a transmitting device 100 and a receiving device 300 for operation within the wireless communication system 500. In this example, a downlink (DL) configuration is shown, meaning 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, without departing from the scope of the invention, the wireless communication system 500 may include any number of transmitting devices and any number of receiving devices.

[0096] It should be noted that this solution is not limited to the downlink scenario, and therefore can be implemented in the uplink (UL), or in both the downlink and uplink. Therefore, depending on the implementation, the transmitting device 100 and the receiving device 300 can be associated with network nodes and / or client devices.

[0097] In one example, the spectrum of the wireless communication system 500 is divided into multiple non-overlapping frequency bands, and at least one integer is associated with each frequency band. In this case, the receiving device 300 is used to map at least one integer based on the frequency bands in order to obtain the carrier frequency.

[0098] The carrier frequency indication in this document can be transmitted by the transmitting device 100 to the receiving device 300 using several different methods, 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 transmit the indication in at least one of the following: Master Information Block (MIB), Remaining System Information (RMSI), Other System Information (OSI), and Radio Resource Control (RRC).

[0099] MIB provides the fastest way to transmit carrier frequency information in broadcast channels. On the other hand, it helps to minimize the payload of broadcast channels.

[0100] The RMSI can be included in the NR-PDSCH scheduled by the NR-PDCCH, where information related to the configuration of the NR-PDCCH / NR-PDSCH is contained in the NR-MIB. If carrier frequency information is included in the RMSI, it means that the RMSI should be detectable even 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.

[0101] OSI can be included in the NR-PDSCH scheduled by the NR-PDCCH, where information related to the configuration of the NR-PDCCH / NR-PDSCH is contained in the NR-MIB and / or RMSI. If carrier frequency information is included in the OSI, it means that the OSI should be detectable even 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.

[0102] The present invention also applies if the carrier frequency indication is transmitted jointly via any combination of NR-MIB, RMSI, and OSI.

[0103] When RRC signaling is used to transmit signals, and the carrier frequency is used to define cells in higher layers for mobility measurements, a cell description including the cell ID and carrier frequency can be transmitted by RRC. In this case, since the RRC signaling is carried by NR-PDSCH, the overhead of transmitting the carrier frequency is less significant.

[0104] Possible implementations of the invention are described and explained below. In this regard, a wireless communication system 500 is considered, wherein a synchronization signal can be placed in a first frequency grid. (That is, on a set of frequencies) the minimum interval is Hz, and the carrier can be placed in the second frequency grid. Above, resulting in a minimum interval of Hz. In such a system, the first and second frequency grids can depend on the frequency band, i.e., the value representing the frequency interval. and It 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 type described above.

[0105] In one implementation of the present invention, the carrier frequency is represented as a channel number. C In this case, the mapping from channel number to carrier frequency, This can be predefined and known to the receiving device 300. For example, the mapping can be performed using closed expressions, such as: , where constant and It can be predefined and .

[0106] In one implementation, N Channel frequency According to 0≤ C ≤ N- 1. Enumeration. In this case, it is not required that the synchronization signal frequency location is a subset of the channel frequency, i.e., This may not be true. On the other hand, this implementation does not preclude the synchronization signal frequency location from being a subset of the channel frequency.

[0107] In one example, the carrier frequency is represented as the channel number. C At this time, a single enumeration is applied across all frequency bands, meaning that each channel number is associated with a unique carrier frequency. In other words, the mapping from channel number to carrier frequency... It's a one-to-one mapping, and the channel number... C Each value is associated with a unique frequency Association. This implementation is in Figure 6The top axis shows the frequency band divided into two bands, band A and band B, and illustrates eight carrier frequencies. A single enumeration is applied in the top axis, thus requiring 3 bits to represent the carrier frequency. This provides a simple way to explicitly determine the carrier frequency, but requires a size of [missing information - likely a specific value]. N The set of channel numbers to include all carrier frequencies of the system. The mapping can be frequency band specific and predefined, for example, Wherein, the grid value is a function of the channel number, that is, .

[0108] In another example, when the carrier frequency is represented as the channel number C At this time, 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 band. Therefore, the spectrum of the wireless communication system 500 is divided into multiple non-overlapping frequency bands, where the channel number... C It is associated with the unique carrier frequency in the frequency band.

[0109] Therefore, the mapping from channel number to carrier frequency It is a one-to-many mapping, and the channel number C Each value can be associated with more than one frequency. Association. However, this still provides a unique mapping for receiving device 300. This is because the receiving device 300 knows which frequency band it is detecting the synchronization signal block in. However, it should be noted that the mapping can be different in different frequency bands; for example, the mapping can be frequency band-specific and predefined, such as... Wherein, the grid value is a function of the channel number. This implementation is in Figure 6 As shown in the bottom axis, the enumeration is repeated for each band A and band B. Therefore, 2 bits are needed to represent the carrier frequency in this case. The advantage of doing this is that fewer bits are needed to encode information about the carrier frequency, for example, when N The frequency positions are divided into M When using a frequency band, from Bits reduced to Bits. One objective of this is to minimize the number of bits required to indicate the carrier frequency, as the number of carrier frequencies can be very large, and for a given channel, a large 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 with a cell ID, for example, to define a measurement object, further information about the specified frequency band may be needed so that the receiving device 300 can uniquely determine the correct carrier frequency.

[0110] In one implementation, the channel number C You can use the MIB Used to indicate, of which SC This represents the total number of subcarriers within a given frequency band. This provides maximum deployment flexibility at the cost of signaling overhead.

[0111] Other possible implementations of the invention apply 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 between the frequency positions of two adjacent synchronization signals... It is a multiple of the subcarrier spacing (SCS) supported by the wireless communication system 500. Furthermore, the synchronization signal frequency location is a subset of the channel frequency, i.e., Here, the multiple of SCS can include the distance between the frequency positions of the two synchronization signals. It refers to the PRB bandwidth for a given SCS. B (Also a multiple of SCS) n times, ,in, n is a positive integer.

[0112] In one implementation, the use of relative channel numbers is disclosed here, provided that the above assumption holds true. To indicate the carrier frequency, that is, In this case, the receiving device 300 detects the frequency position of the synchronization signal block. The frequency position of the synchronization signal block is located on the channel grid and its relative carrier frequency is determined based on a predefined mapping rule. .For example, It can be a carrier frequency grid A multiple of. The carrier frequency is derived based on the aforementioned relative channel number. .because Therefore, The number of bits representing the relative channel number can be... ,in N It refers to the number of synchronization signal frequencies.

[0113] In another implementation, when the above assumption holds, the use of relative channel numbers is disclosed here. To indicate the carrier frequency, that is, In this case, the receiving device is informed of the 300 frequency position. The frequency location is situated on the channel grid and its relative carrier frequency is determined based on predefined mapping rules. .For example, It can be a carrier frequency grid A multiple of. The carrier frequency is derived based on the aforementioned relative channel number. .because Therefore, The number of bits representing the relative channel number can be... ,in N It is the number of channel grids in this frequency band.

[0114] One advantage that can be recognized is that the number can be determined from the maximum carrier bandwidth. N That is, the maximum number of carrier frequencies that can be located within a carrier. It can be recognized that this provides a minimum value. N This is because, relative to the carrier bandwidth, the carrier frequency cannot be located further away from the synchronization signal block frequency. For example, suppose the maximum carrier bandwidth is... W Hz, from which we can derive By using the floor function, we can make Indicates greater than x The smallest integer. Furthermore, the maximum carrier bandwidth can depend on the frequency band; for example, a very wide carrier can be used in higher frequency bands. Also, the second grid may differ in different frequency bands. Therefore, the number... N It can depend on the frequency, for example, .

[0115] If, in addition to requiring placement on the first grid and on the position of the in-carrier synchronization signal block, other constraints can be assumed, then the quantity... N It can be further reduced. For example, assume the carrier frequency and the synchronization channel block frequency... The distance cannot exceed X Hz (of which X (less than the maximum carrier bandwidth), from which we can conclude .

[0116] quantity N A single enumeration can then be performed, and the results can be obtained based on all synchronization signal frequencies in the wireless communication system 500.

[0117] In another case, quantity N Multiple enumerations are possible. This is achieved by dividing the spectrum into predefined disjoint frequency bands and performing enumeration independently for each band. Therefore, the mapping... It is a one-to-many mapping, and each value It can be with more than one frequency Association. However, this still provides a unique mapping for receiving device 300. This is because the receiving device 300 knows which frequency band it is detecting the synchronization signal block in. The advantage of this is that fewer bits are needed to encode information about the carrier frequency; for example, when…N The frequency positions are divided into M When using a frequency band, from Bits reduced to Bits. When the carrier frequency is used with the cell ID, for example, to define a measurement object, further information about the specified frequency band may be needed so that the receiving device 300 can uniquely determine the correct carrier frequency.

[0118] In another implementation of the invention, when the above assumption holds true, 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.

[0119] In a possible implementation of the invention, the first frequency position is given by the number of PRBs or the resolution of the first frequency grid. Therefore, the second frequency position is given by the resolution of the second frequency grid. The grid resolution here refers to the frequency interval between two adjacent frequencies of the grid.

[0120] In one implementation of this approach, it is assumed that for a given SCS, the distance between the frequency positions of two synchronization signals is... It is PRB bandwidth B of n times, ,in, n Positive integer. Therefore, the first index. The offset relative to the detected synchronization signal frequency position is determined, wherein the carrier frequency is located at the synchronization signal frequency position, for example, the offset is in PRB bandwidth steps. B Or it can be represented by the first frequency grid step size (also expressed as the SS grid step size, or SS grid resolution). In one implementation, the value... M Determine the PRB or first frequency grid step size applicable to the above frequency band. The quantity. In another implementation, the value M Determine the PRB or first frequency grid step size applicable to the aforementioned maximum carrier bandwidth. The quantity. It can be recognized that this can reduce... M The value of is determined because the distance between the synchronization signal and the carrier frequency cannot exceed 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 a frequency region defined by two consecutive synchronization signal frequencies. For example, in Figure 7 In this context, the carrier frequency is located at the frequency of the detected synchronization signal block (i.e., At 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 the first index has a step size or granularity greater than the second frequency grid, and assuming the distance, the aforementioned carrier frequency can be located at the aforementioned synchronization signal block frequency. The number of PRBs or synchronization signal grid positions is limited, for example, by the maximum carrier bandwidth, which allows for a reduction in the number of bits used to represent the carrier frequency.

[0121] One result of this invention is that once the receiving device 300 determines the carrier frequency, it can determine the PRB frequency position and / or RS frequency position within the carrier, assuming their frequency positions are associated with the carrier frequency. For example, if the system bandwidth is transmitted to the receiving device 300 using the carrier frequency and the system bandwidth, the PRB position within the carrier band can be determined. One PRB position is determined for each system bandwidth.

[0122] In one example, if the frequency band Z If the total number of PRBs in the array is odd, then PRB#( Z The center frequency of +1) / 2 is aligned with the carrier frequency. In this case, the PRB position is as follows: Figure 8 As shown in (a). If the frequency band ( Z If the total number of PRBs within a given range is even, then the carrier frequency is located within PRB#( Z / 2) and PRB#( Z Between / 2+1), and PRB is located as follows Figure 8 The location shown in (b).

[0123] The advantage of aligning PRBs within a carrier according to a given frequency (e.g., the carrier frequency mentioned above) is that the PRBs of multiple carriers become aligned in frequency position. This enables the use of techniques for inter-cell interference coordination.

[0124] Depending on the technologies and terminology used, network nodes in this document can also be referred to as wireless network nodes, access network nodes, access points, or base stations, such as radio base stations (RBS). In some networks, a radio base station may be called a transmitter, "eNB," "eNodeB," "NodeB," or "B-node." Wireless network nodes can be classified differently based on transmission power and cell size, such as macro eNodeBs, home eNodeBs, or pico base stations. A wireless network node can be a station (STA), which is any device that includes IEEE 802.11—Media Access Control (MAC) and Physical Layer (PHY) interfaces compliant with Wireless Medium (WM). A wireless network node can also be a base station corresponding to a fifth-generation (5G) wireless system.

[0125] The client device in this document can refer to a user equipment (UE), a mobile station, an Internet of Things (IoT) device, a sensor device, a wireless terminal, and / or a mobile terminal capable of wireless communication in a wireless communication system (sometimes also called a cellular wireless system). The UE can also refer to a wirelessly capable mobile phone, cellular phone, computer tablet, or laptop. In the context of this disclosure, the UE can be, for example, a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device capable of communicating voice and / or data with another entity (e.g., another receiver or server) via a wireless access network. The UE can be a station (STA), which is any device containing IEEE 802.11—Media Access Control (MAC) and Physical Layer (PHY) interfaces compliant with Wireless Medium (WM). The UE can also be used for communications in 3GPP-related LTE and LTE-Advanced, WiMAX and its evolutions, and fifth-generation wireless technologies (e.g., New Radio).

[0126] Furthermore, any method according to embodiments of the present invention can be implemented in a computer program having code means, which, when run by a processing means, causes the processing means to perform the steps of the method. The computer program is included in a computer-readable medium of the computer program product. The computer-readable medium can substantially include any memory, such as ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable PROM), flash memory, EEPROM (Electrically Erasable PROM), or hard disk drive.

[0127] Furthermore, those skilled in the art will recognize that network nodes and client devices include the necessary communication capabilities, such as functions, devices, units, and elements, for implementing this solution. Other examples of such devices, units, elements, and functions include: processors, memories, buffers, control logic, encoders, decoders, rate matchers, rate dematchers, mapping units, multipliers, decision units, selection units, switches, interleavers, deinterleavers, 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 suitably arranged together to implement the solution of this invention.

[0128] Specifically, the processors of network nodes and client devices may include, for example, a Central Processing Unit (CPU), a processing unit, processing circuitry, a processor, an Application-Specific Integrated Circuit (ASIC), a microprocessor, or one or more instances of other processing logic capable of interpreting and executing instructions. Therefore, the term "processor" can refer to processing circuitry comprising multiple processing circuits, such as any, some, or all of the processing circuitry mentioned above. Processing circuitry can 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.

[0129] Finally, it should be understood that the present invention is not limited to the above embodiments, nor to all embodiments included within the scope of the appended independent claims.

Claims

1. A method for a transmitting device, the method comprising: Transmitting one or more synchronization signals on a carrier to at least one receiving device, wherein the frequency of one or more synchronization signals is located on a first frequency grid, and the carrier frequency of the carrier is deployed on a second frequency grid; and The carrier frequency indication is sent to the at least one receiving device, wherein the indication includes at least one integer, the at least one integer being 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 position of the carrier frequency relative to the first frequency position.

2. A method for receiving a device, the method comprising: Receive one or more synchronization signals on a carrier from a transmitting device, wherein the frequency of one or more synchronization signals is located on a first frequency grid, and the carrier frequency of the carrier is deployed on a second frequency grid; The transmitter receives an indication of the carrier frequency, wherein the indication includes at least one integer, the at least one integer being 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 position of the carrier frequency relative to the first frequency position; and The carrier frequency is obtained based on the at least one integer.

3. The method according to claim 1 or 2, wherein, The frequency spacing between two adjacent synchronization signals is a multiple of the subcarrier spacing in a wireless communication system.

4. The method according to claim 1 or 2, wherein, The first frequency grid is a subset of the second frequency grid.

5. The method according to any one of claims 1 to 4, wherein, The first frequency location is given by the number of physical resource blocks, and the carrier frequency location is given by the resolution of the second frequency grid.

6. The method according to any one of claims 1 to 4, wherein, The first frequency position is given with the resolution of the first frequency grid, and the position of the carrier frequency is given with the resolution of the second frequency grid.

7. The method according to any one of claims 1-6, The instruction is sent in at least one of the following: Master Information Block (MIB), Remaining System Information (RMSI), Other System Information (OSI), and Radio Resource Control (RRC).

8. The method according to any one of claims 1 to 4, wherein, The first frequency location is given by the number of physical resource blocks, and the second index provides the location of the carrier frequency within the physical resource block.

9. The method according to any one of claims 1 to 8, wherein, The carrier frequency is equal to the center frequency of the carrier.

10. The method according to any one of claims 1 to 8, wherein, The carrier frequency is not equal to the center frequency of the carrier.

11. The method according to any one of claims 1 to 10, wherein the frequency band in which the carrier is located includes values ​​determined from the first frequency grid and the second frequency grid.

12. The method according to any one of claims 1 to 11, wherein the frequencies of two different synchronization signals among the one or more synchronization signals are located at different frequency positions in the first frequency grid.

13. A computer program product having program code, the computer program product comprising a computer program that, when run on a computer, performs the method according to any one of claims 1 to 12.

14. A computer-readable storage medium comprising a computer program that, when executed on a computer, causes the computer to perform the method of any one of claims 1 to 12.

15. An apparatus comprising: Memory, used to store computer programs; and A processor for calling and running the computer program from the memory to perform the method according to any one of claims 1 to 12.

16. A communication system, comprising: The apparatus for performing the method as described in claim 1, or any one of claims 3 to 12 referencing claim 1, and the apparatus for performing the method as described in claim 2, or any one of claims 3 to 12 referencing claim 2.

17. A communication apparatus comprising a unit for performing the method as described in any one of claims 1 to 12.

Images