Patent Description:
In 3GPP New Radio (NR), a Synchronization Signal (SS) block comprises NR-Primary Synchronization Signal (NR-PSS), NR-Secondary Synchronization Signal (NR-SSS) and NR-Physical Broadcast Channel (NR-PBCH). After detecting a synchronization signal block, a User Equipment (UE) is able to synchronize to a cell and obtain a cell ID of the cell as well as obtaining broadcast information. The broadcast information, e.g., the NR-Master Information Block (NR-MlB), may further contain information making it possible for the UE to detect the NR-Physical Downlink Shared Channel (NR-PDSCH) for obtaining system information, e.g., Remaining System Information (RMSI) and Other System Information (OSI). The NR-PBCH may include information about control channel resources wherein the UE may detect a NR-Physical Downlink Control Channel (NR-PDCCH) which is scheduling the RMSI through the NR-PDSCH. The NR-PBCH should be received over a large coverage area and therefore its payload should be minimized. Additional system information may be contained in the RMSI or the OSI.

In 3GPP NR, the synchronization signal block is located on a frequency raster (e.g., the center frequency of the SS block or the SS is on the raster), i.e., a set of frequencies with a predefined spacing between them. The frequency raster used for the synchronization signal block, herein denoted the synchronization signal raster, may be different from the frequency raster used for the NR channels, herein denoted the NR channel raster. The NR channel raster defines the carrier frequencies (e.g., the center frequency of a carrier) available for deploying an NR carrier. A carrier should be understood as an entity of the communication system which comprises channels and signals used for communications and carriers could be deployed in both downlink and uplink communications. More information about the SS block can be found in <NPL>).

The synchronization signal raster and the NR channel raster may be selected for different purposes. Hence, the synchronization signal raster may, e.g., be sparser than the NR channel raster to reduce the search complexity for the UE. At least for initial cell selection, the UE searches for synchronization signals on the synchronization signal raster. The synchronization signal raster could, e.g., be a multiple of <NUM>, which is a SubCarrier Spacing (SCS) in NR, say <NUM> or <NUM>. The NR system will provide different SCS, e.g., the SS may use <NUM>, <NUM>, <NUM> or <NUM> SCS. Additional SCS such as <NUM> may be applicable to other channels and signals. In addition, the synchronization signal raster may be different in different frequency bands, e.g., it could be <NUM> in bands where LTE and NR should coexist. Similarly, the NR channel raster may be different in different frequency bands, e.g., it could be <NUM> in bands where LTE and NR should coexist and could assume larger values in high frequency bands, where the amount of spectrum is much larger.

If the synchronization signal raster and NR channel raster are different, it is realized that the synchronization signal block may not be located around the center frequency of the NR carrier, e.g., the carrier frequency. Moreover, an NR carrier may include multiple synchronization signal blocks transmitted at different frequency locations. Hence, the synchronization signal raster could give synchronization signal frequency locations which are a subset of the channel frequencies, or which are not at all aligned with the channel frequencies or which are partly aligned with the channel frequencies.

In the conventional system 3GPP LTE, the synchronization signals are located around the center frequency of the carrier and the synchronization signal raster is the same as the channel raster. Hence, the UE could determine the carrier frequency implicitly from the detected frequency position of the synchronization signal. The carrier frequency information allows the UE to achieve one or several of the following non-limiting tasks:.

In 3GPP NR, on the other hand, the UE will not be able to determine the carrier frequency implicitly from the detected synchronization signal block as the synchronization signal raster and the NR channel raster may be different. Hence, there is an issue on how to determine the NR carrier frequency in 3GPP NR.

The above and further objectives are solved by the subject matter of the independent claims. Further advantageous implementation forms of the present invention can be found in the dependent claims.

According to a first aspect of the invention, the above mentioned and other objectives are achieved with a transmitting device for a wireless communication system, the transmitting device being configured to.

According to a second aspect of the invention, the above mentioned and other objectives are achieved with receiving device for a wireless communication system, the receiving device being configured to:.

According to a third aspect of the invention, the above mentioned and other objectives are achieved with a method for a transmitting device, the method comprising:.

According to a fourth aspect of the invention, the above mentioned and other objectives are achieved with a method for a receiving device, the method comprising:.

Further applications and advantages of the present invention will be apparent from the following detailed description.

The appended drawings are intended to clarify and explain different embodiments of the present invention, in which:.

<FIG> shows a transmitting device <NUM> according to an implementation form of the invention. In the implementation shown in <FIG>, the transmitting device <NUM> comprises a processor <NUM>, a transceiver <NUM> and a memory <NUM>. The processor <NUM> is coupled to the transceiver <NUM> and the memory <NUM> by communication means <NUM> known in the art. The transmitting device <NUM> may be configured for both wireless and wired communications in wireless and wired communication systems, respectively. The wireless communication capability is provided with an antenna <NUM> coupled to the transceiver <NUM>, while the wired communication capability is provided with a wired communication interface <NUM> coupled to the transceiver <NUM>.

That the transmitting device <NUM> is configured to perform certain actions and/or functions according to the invention should in this disclosure be understood to mean that the transmitting device <NUM> comprises suitable means, such as e.g. the processor <NUM> and the transceiver <NUM>, configured to perform said actions and/or functions.

The transmitting device <NUM> in <FIG> is configured to transmit one or more synchronization signals (SSs) on a carrier to at least one receiving device <NUM>, wherein a frequency of a synchronization signal among the one or more synchronization signals is located on a first frequency raster and a carrier frequency of the carrier is deployed on a second frequency raster, and wherein frequencies of two different synchronization signals among the one or more synchronization signals are located on different frequency positions in the first raster. The transmitting device <NUM> is further configured to transmit an indication of the carrier frequency to the at least one receiving device <NUM>. The indication herein comprises at least one integer number.

<FIG> shows a flow chart of a corresponding method <NUM> which may be executed in a transmitting device <NUM>, such as the one shown in <FIG>. The method <NUM> comprises transmitting <NUM> one or more synchronization signals on a carrier to at least one receiving device <NUM>, wherein a frequency of a synchronization signal among the one or more synchronization signals is located on a first frequency raster and a carrier frequency of the carrier is deployed on a second frequency raster, and wherein frequencies of two different synchronization signals among the one or more synchronization signals are located on different frequency positions in the first raster. The method further comprises transmitting <NUM> an indication of the carrier frequency to the at least one receiving device <NUM>. The indication comprises at least one integer number.

<FIG> shows a receiving device <NUM> according to an implementation form of the invention. In the implementation shown in <FIG>, the receiving device <NUM> comprises a processor <NUM>, a transceiver <NUM> and a memory <NUM>. The processor <NUM> is coupled to the transceiver <NUM> and the memory <NUM> by communication means <NUM> known in the art. The receiving device <NUM> further comprises an antenna <NUM> coupled to the transceiver <NUM>, which means that the receiving device <NUM> is configured for wireless communications in a wireless communication system.

That the receiving device <NUM> is configured to perform certain actions and/or functions according to the invention should in this disclosure be understood to mean that the receiving device <NUM> comprises suitable means, such as e.g. the processor <NUM> and the transceiver <NUM>, configured to perform said actions and/or functions.

The receiving device <NUM> is configured to receive one or more synchronization signals on a carrier from a transmitting device <NUM>, wherein a frequency of a synchronization signal among the one or more synchronization signals is located on a first frequency raster and a carrier frequency of the carrier is deployed on a second frequency raster, and wherein frequencies of two different synchronization signals among the one or more synchronization signals are located on different frequency positions in the first raster. The receiving device <NUM> is further configured to receive an indication of the carrier frequency from the transmitting device <NUM>, wherein the indication comprises at least one integer number. The receiving device <NUM> is further configured to derive the carrier frequency based on the at least one integer number. Examples of how the carrier frequency is derived from the at least one integer number is explained in the following disclosure.

<FIG> shows a flow chart of a corresponding method <NUM> which may be executed in a receiving device <NUM>, such as the one shown in <FIG>. The method <NUM> comprises receiving <NUM> one or more synchronization signals on a carrier from a transmitting device <NUM>, wherein a frequency of a synchronization signal among the one or more synchronization signals is located on a first frequency raster and a carrier frequency of the carrier is deployed on a second frequency raster, and wherein frequencies of two different synchronization signals among the one or more synchronization signals are located on different frequency positions in the first raster. The method <NUM> further compromises receiving <NUM> an indication of the carrier frequency from the transmitting device <NUM>, wherein the indication comprises at least one integer number. The method <NUM> further comprises deriving <NUM> the carrier frequency based on the at least one integer number.

<FIG> shows a wireless communication system <NUM> according to an implementation of the invention. The wireless communication system <NUM> comprises a transmitting device <NUM> and a receiving device <NUM> configured to operate in the wireless communication system <NUM>. In this example, the downlink (DL) case is illustrated which means that the transmitting device <NUM> is part of a network node (such as a base station) whilst the receiving device <NUM> is part of a client device (such as a UE). In the wireless communication system <NUM>, synchronization signals (SSs) are transmitted by the transmitting device <NUM> and received by the receiving device <NUM>. For simplicity, the wireless communication system <NUM> shown in <FIG> only comprises one transmitting device <NUM> and one receiving device <NUM>. However, the wireless communication system <NUM> may comprise any number of transmitting devices and any number of receiving devices without deviating from the scope of the invention.

It is to be noted that the present solution is not limited to the downlink case and can therefore be implemented in the uplink (UL) or both in the downlink and the uplink. Hence, the transmitting device <NUM> and the receiving device <NUM> may be associated with a network node and/or a client device depending on the implementation case.

In one example, the frequency spectrum of the wireless communication system <NUM> is divided into a plurality of non-overlapping frequency bands, and the at least one integer number is associated with a frequency band. In this case, the receiving device <NUM> is configured to map the at least one integer number based on the frequency band so as to derive the carrier frequency.

The indication of the carrier frequency herein could be signaled by the transmitting device <NUM> to the receiving device <NUM> using several different methods, e.g., depending on when during the access procedure the receiving device <NUM> needs to be aware of the carrier frequency. The transmitting device <NUM> is hence configured to transmit the indication in at least one of: a Master Information Block (MIB), Remaining System Information (RMSI), Other System Information (OSI), and Radio Resource Control (RRC).

The MIB offers the quickest way of delivering the carrier frequency information in a broadcast channel. On the other hand, it is beneficial to minimize the payload of the broadcast channel.

The RMSI can be contained in the NR-PDSCH which is scheduled by the NR-PDCCH, where information related to the configuration of the NR-PDCCH/NR-PDSCH are contained in the NR-MIB. If the carrier frequency information is contained in the RMSI, it implies that the RMSI should be detectable without knowing the carrier frequency. Hence, resources in NR-PDCCH/NR-PDSCH for determining RMSI should not depend on the carrier frequency but may be determined from the NR-SS and/or NR-PBCH.

The OSI can be contained in the NR-PDSCH which is scheduled by the NR-PDCCH, where information related to the configuration of the NR-PDCCH/NR-PDSCH are contained in the NR-MIB and/or the RMSI. If the carrier frequency information is contained in the OSI, it implies that the OSI should be detectable without knowing the carrier frequency. Hence, resources in NR-PDCCH/NR-PDSCH for determining OSI should not depend on the carrier frequency but may be determined from the NR-SS and/or NR-PBCH.

The invention is also applicable if the indication of the carrier frequency is jointly transmitted by any of the NR-MIB, RMSI and OSI.

When RRC signaling is used for signaling and the carrier frequency is used to define cells in higher layers for mobility measurements, a cell description comprising both cell ID and carrier frequency could be signaled by RRC. In this case, the overhead of signaling the carrier frequency is less critical since RRC signaling is carried by the NR-PDSCH.

In the following, possible implementation forms of the invention are described and explained. In this respect a wireless communication system <NUM> where synchronization signals could be placed on a first frequency raster {fSS,i} (i.e., a set of frequencies) resulting in a minimum separation of |fSS,i - fSS,i+<NUM> | = ΔfSS Hz and where carriers could be placed on a second frequency raster {fC,i} resulting in a minimum separation of |fC,i - fC,i+<NUM> | = ΔfC Hz, is considered. The first frequency raster and the second frequency raster could in such a system be frequency band dependent, i.e., the values ΔfSS(fSS,i ) and ΔfC(fC,i) representing the frequency spacing may not be constants and could be a function of the frequency. It is however noted that the invention is not limited to the above described type of wireless communication system.

In one implementation of the invention, the carrier frequency is indicted as a channel number C. In this case the mapping from a channel number to a carrier frequency, C → fC,i, could be pre-defined and be known to the receiving device <NUM>. As an example, the mapping could be performed using a closed form expression, such as: FDL = FDL_low + ΔfC(C - NOffs_DL), where the constants FDL_low and NOffs_DL can be predefined and FDL = fC,i.

In one realization, N channel frequencies <MAT> could be enumerated from, <NUM> ≤ C ≤ N - <NUM>. In this case, there is no requirement that the synchronization signal frequency locations are a subset of the channel frequencies, i.e., {fSS,i } ⊆ {fC,i } may not hold. On the other hand, this implementation does not preclude that the synchronization signal frequency locations are a subset of the channel frequencies.

In one example when the carrier frequency is indicted as a channel number C, a single enumeration is applied over all frequency bands which means that each channel number is associated with a unique carrier frequency. That is, the mapping of a channel number to a carrier frequency C → fC,i is a one-to-one mapping and every value of the channel number C is associated with a unique frequency fC,i. This implementation is illustrated in the top axis in <FIG> in which the frequency band is divided into two bands, i.e. band A and band B, and <NUM> carrier frequencies are shown. In the top axis a single enumeration is applied and <NUM> bits are therefore needed for representing a carrier frequency. This would provide a simple way to unambiguously determine the carrier frequency but requires the size N of the set of channel numbers to encompass all carrier frequencies of the system. The mapping could be frequency band specific and pre-defined, e.g., FDL = FDL_low + ΔfC(C)(C - NOffs_DL), where the raster value is a function of the channel number, i.e. ΔfC(C).

In another example when the carrier frequency is indicted as a channel number C, multiple enumerations are applied over all frequency bands. This can be realized by dividing the spectrum into pre-defined disjoint frequency bands and performing an enumeration independently for each frequency band. Therefore, the frequency spectrum of the wireless communication system <NUM> is divided into a plurality of non-overlapping frequency bands, and wherein the channel number C is associated with a unique carrier frequency in a frequency band.

Hence, the mapping from a channel number to a carrier frequency C → fC,i is a one-to-many mapping and every value of the channel number C could be associated with more than one frequency fC,i. However, this still provides the receiving device <NUM> with a unique mapping C → fC,i since it knows in which frequency band it is detecting the synchronization signal block. It is noted however that the mapping may be different in different frequency bands, e.g., the mapping could be frequency band specific and pre-defined, e.g., FDL = FDL_low + ΔfC(C)(C - NOffs_DL), where the raster value is a function of the channel number, ΔfC(C). This implementation is illustrated in the bottom axis in <FIG> in which the enumeration is repeated for each band A and B. Hence, <NUM> bits are needed in this case for representing a carrier frequency. The advantage of this is that fewer bits are needed for encoding the information about the carrier frequency, e.g., a reduction from log<NUM> N bits to log<NUM> (N /M) when N frequency positions are divided into M frequency bands. It is one objective to minimize the number of bits needed for indicating the carrier frequency, since the number of carrier frequencies may be very large while a large signaling overhead incurs smaller area coverage (i.e., higher code rates) for a given channel. Area coverage is particularly important for channels used for the initial access, such as synchronization signals, broadcast signals and for channels delivering system information. When carrier frequency is used together with cell ID, e.g., to define a measurement object, further information about the designated frequency band may be needed in order for the receiving device <NUM> to be able to determine the correct carrier frequency uniquely.

In one implementation, the channel number C can be indicated using log<NUM> SC bits in MIB, where SC is the total number of subcarriers within a given frequency band. This gives maximum deployment flexibility at the cost of signaling overhead.

Further possible implementations of the invention apply when a frequency spacing between two neighboring synchronization signals is a multiple of a sub-carrier spacing of the wireless communication system <NUM>, and wherein the first frequency raster is a subset of the second frequency raster. In other words, the distance between two neighboring synchronization signal frequency locations, ΔfSS, is a multiple of a SubCarrier Spacing (SCS) supported by the wireless communication system <NUM>. Further, the synchronization signal frequency locations are a subset of the channel frequencies, i.e., {fSS,i } ⊆ {fC,i }. Herein, a multiple of a SCS may include the case where the distance between two synchronization signal frequency locations, ΔfSS, is a multiple n of a PRB bandwidth B (which is also a multiple of a SCS) for a certain given SCS, ΔfSS = n · B, where n is a positive integer.

In one implementation when the above assumptions hold, it is disclosed here that the carrier frequency is indicated using a relative channel number ΔC, i.e. -(N - <NUM>) ≤ ΔC ≤ N - <NUM>. In this case the receiving device <NUM> detects the synchronization signal block frequency location fSS,i, which is on the channel raster and determines a relative carrier frequency ΔC → ΔfC,i based on a pre-defined mapping rule. For example, ΔfC,i may be a multiple of the carrier frequency raster, ΔfC = |fC,i - fC,i+<NUM> |. The carrier frequency is derived based on the relative number, fSS,i + ΔfC,i. Since {fSS,i } ⊆ {fC,i }, it follows that fSS,i + ΔfC,i ⊆ {fC,i }. The number of bits to represent the relative channel number could be log<NUM> (<NUM>N + <NUM>) where N is the number of synchronization signal frequencies.

In another implementation when the above assumptions hold, it is disclosed here that the carrier frequency is indicated using a relative channel number ΔC, i.e. -(N - <NUM>) ≤ ΔC ≤ N - <NUM>. In this case the receiving device <NUM> is informed of a frequency location fWB, which is on the channel raster and determines a relative carrier frequency ΔC → ΔfC,i based on a pre-defined mapping rule. For example, ΔfC,i may be a multiple of the carrier frequency raster, ΔfC = |fC,i - fC,i+<NUM> |. The carrier frequency is derived based on the relative number, fWB + ΔfC,i. Since fWB ∈ {fC,i }, it follows that fWB + ΔfC,i ⊆ {fC,i }. The number of bits to represent the relative channel number could be log<NUM>(<NUM>N + <NUM>) where N is the number of channel rasters on this frequency band.

It is realized that one advantage is that the number N could be determined from the maximum carrier bandwidth, i.e., the maximum number of carrier frequencies that could be located within a carrier. It is realized that this would offer a minimum value of N since the carrier frequency could not be located farther away from the synchronization signal block frequency than the carrier bandwidth. For example, suppose that the maximum carrier bandwidth is W Hz, it follows that <MAT>, utilizing the ceiling operator, such that <MAT> denotes the smallest integer being larger than x. Furthermore, the maximum carrier bandwidth may depend on the frequency band, e.g., very wide carriers may be used in higher frequency bands. Also, the second raster may be different in different frequency bands. Therefore, the number N could be frequency dependent such as <MAT>.

If other restrictions could be assumed, in addition to requiring placement on the first raster, on the location the synchronization signal block(s) within the carrier, the number N could be decreased further. For example, suppose that the carrier frequency cannot be located farther away than X Hz (where X is smaller than the maximum carrier bandwidth) from the synchronization signal block frequency fSS,i, it follows that <MAT>.

The number N could follow a single enumeration and be derived based on all synchronization signal frequencies in the wireless communication system <NUM>.

The number N could in another case follow multiple enumerations. This is realized by dividing the spectrum into pre-defined disjoint frequency bands and performing an enumeration independently for each frequency band. Hence, the mapping ΔC → ΔfC,i is a one-to-many mapping and every value ΔC could be associated with more than one frequency ΔfC,i. However, this still provides the receiving device <NUM> with a unique mapping ΔC → fC,i since it knows in which frequency band it is detecting the synchronization signal block. The advantage of this is that fewer bits need to be used for encoding the information about the carrier frequency, e.g., a reduction from log<NUM>(<NUM>N + <NUM>) bits to log<NUM>(<NUM>N /M) when N frequency positions are divided into M frequency bands. When carrier frequency is used together with cell ID, e.g., to define a measurement object, further information about the designated frequency band may be needed in order for the receiving device <NUM> to uniquely be able to determine the correct carrier frequency.

In the invention, when the above assumptions hold, the carrier frequency is indicated using a first index and a second index. The first index indicates a first frequency location relative to the frequency location of the synchronization signal and the second index indicates a second frequency location relative to the first frequency location indicated by the first index.

In possible implementations of the invention, the first frequency location is given in number of PRBs or in a resolution of the first frequency raster. The second frequency location is therefore given in a resolution the second frequency raster. By resolution of a raster, it is here meant the frequency spacing between two neighbouring frequencies of the raster.

In one realization of this implementation, it is assumed that the distance between two synchronization signal frequency locations, ΔfSS, is a multiple n of a PRB bandwidth B for a certain given SCS, ΔfSS = n · B, where n is a positive integer. The first index -(M - <NUM>) ≤ δ ≤ M - <NUM> therefore determines an offset, e.g., in terms of PRB bandwidth steps B or first frequency raster steps (also denoted SS raster steps, or SS raster resolution), from the detected synchronization signal frequency location wherein the carrier frequency is located. In one realization, the value M determines the number of PRBs or first frequency raster steps ΔfSS that could fit into the frequency band. In another realization, the value M determines the number of PRBs or first frequency raster steps ΔfSS that could fit into the maximum carrier bandwidth. It is realized that this may reduce the value of M since the distance between the synchronization signal and the carrier frequency cannot be larger than the maximum carrier bandwidth (which may be frequency band dependent). The second index provides the location of the carrier frequency within the PRB or within the frequency region confined by two consecutive synchronization signal frequencies. For example, in <FIG>, the carrier frequency is located <NUM> PRBs (second index) away from the detected synchronization signal block frequency (i.e., fSS,i) and the carrier frequency is located on the second carrier frequency (first index) from the location derived from the first index. This allows reducing the number of bits for representing the carrier frequency, assuming that the first index has steps or granularity which are larger than the second frequency raster and that there is a constraint on how many PRBs or synchronization signal raster positions away from the synchronization signal block frequency that the carrier frequency could be placed, e.g., being limited by the maximum carrier bandwidth.

One consequence of the invention is that, once the receiving device <NUM> has determined the carrier frequency, it could determine the PRB frequency locations and/or the RS frequency locations within a carrier, assuming their frequency locations are associated with the carrier frequency. For example, if the system bandwidth is signaled to the receiving device <NUM> with the carrier frequency and the system bandwidth, the PRB locations within the carrier frequency band can be determined. For each system bandwidth, one PRB location is determined.

In one example, if the total number of PRBs within the frequency band Z is odd, then the central frequency of PRB#(Z+<NUM>)/<NUM> is aligned with the carrier frequency. In this case, the PRB location is located as illustrated in <FIG>. If the total number of PRBs within the frequency band (Z) is even, then the carrier frequency is located between PRB#(Z/<NUM>) and PRB#(Z/<NUM>+<NUM>) and the PRB is located as illustrated in <FIG>.

An advantage of aligning the PRBs from a given frequency (e.g., the carrier frequency) in a carrier is that the PRBs become frequency position aligned between carriers. This enables use of techniques utilizing inter-cell interference coordination.

The network node herein may also be denoted as a radio network node, an access network node, an access point, or a base station, e.g. a Radio Base Station (RBS), which in some networks may be referred to as transmitter, "eNB", "eNodeB", "NodeB" or "B node", depending on the technology and terminology used. The radio network nodes may be of different classes such as e.g. macro eNodeB, home eNodeB or pico base station, based on transmission power and thereby also cell size. The radio network node can be a Station (STA), which is any device that contains an IEEE <NUM>-conformant Media Access Control (MAC) and Physical Layer (PHY) interface to the Wireless Medium (WM). The radio network node may also be a base station corresponding to the fifth generation (<NUM>) wireless systems.

The client device herein may be denoted as a user device, a User Equipment (UE), a mobile station, an internet of things (IoT) device, a sensor device, a wireless terminal and/or a mobile terminal, is enabled to communicate wirelessly in a wireless communication system, sometimes also referred to as a cellular radio system. The UEs may further be referred to as mobile telephones, cellular telephones, computer tablets or laptops with wireless capability. The UEs in the present context may be, for example, portable, pocket-storable, hand-held, computer-comprised, or vehicle-mounted mobile devices, enabled to communicate voice and/or data, via the radio access network, with another entity, such as another receiver or a server. The UE can be a Station (STA), which is any device that contains an IEEE <NUM>-conformant Media Access Control (MAC) and Physical Layer (PHY) interface to the Wireless Medium (WM). The UE may also be configured for communication in 3GPP related LTE and LTE-Advanced, in WiMAX and its evolution, and in fifth generation wireless technologies, such as New Radio.

Moreover, it is realized by the skilled person that the network node and the client device comprises the necessary communication capabilities in the form of e.g., functions, means, units, elements, etc., for performing the present solution. Examples of other such means, units, elements and functions are: processors, memory, buffers, control logic, encoders, decoders, rate matchers, de-rate matchers, mapping units, multipliers, decision units, selecting units, switches, interleavers, de-interleavers, modulators, demodulators, inputs, outputs, antennas, amplifiers, receiver units, transmitter units, DSPs, MSDs, TCM encoder, TCM decoder, power supply units, power feeders, communication interfaces, communication protocols, etc. which are suitably arranged together for performing the present solution.

Especially, the processor(s) of the network node and the client device may comprise, e.g., 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 may interpret and execute instructions. The expression "processor" may thus represent a processing circuitry comprising a plurality of processing circuits, such as, e.g., any, some or all of the ones mentioned above. The processing circuitry may further perform data processing functions for inputting, outputting, and processing of data comprising data buffering and device control functions, such as call processing control, user interface control, or the like.

Claim 1:
A transmitting device (<NUM>) for a wireless communication system (<NUM>), the transmitting device (<NUM>) being configured to:
transmit one or more synchronization signals on a carrier to at least one receiving device (<NUM>), wherein a frequency of a synchronization signal among the one or more synchronization signals is located on a first frequency raster and a carrier frequency of the carrier is deployed on a second frequency raster, and wherein frequencies of two different synchronization signals among the one or more synchronization signals are located on different frequency positions in the first raster; and
transmit an indication of the carrier frequency to the at least one receiving device (<NUM>), wherein the indication of the carrier frequency comprises at least one integer number, and wherein the at least one integer number is a first index indicating an offset indicative of a first frequency location relative to a location of the frequency of the synchronization signal and a second index indicating a second frequency location indicative of a location of the carrier frequency relative to the first frequency location.