WO2023165548A1

WO2023165548A1 - Method for generating downlink public signal, and associated communication apparatus

Info

Publication number: WO2023165548A1
Application number: PCT/CN2023/079212
Authority: WO
Inventors: 胡锦娜; 马川
Original assignee: 华为技术有限公司
Priority date: 2022-03-02
Filing date: 2023-03-02
Publication date: 2023-09-07
Also published as: CN116760516A

Abstract

The embodiments of the present disclosure relate to a method for generating a downlink public signal, and an associated communication apparatus. According to the embodiments of the present disclosure, a network device generates a sequence in a downlink public signal at least on the basis of frequency-domain information of a frequency-domain resource which is used for sending the downlink public signal, such that the sequence generation formulas for different frequency offset positions are different, and thus data is also different. Therefore, data of a plurality of downlink public signals which occupy different frequency-domain resources in the same time domain changes along with frequency-domain information, thereby reducing a peak-to-average power ratio and avoiding the generation of nonlinear distortion in the signals. A terminal device can determine a possible sequence set of public signals by means of sweeping frequency offset positions of the public signals, thereby reducing sequence contrast complexity.

Description

Method for generating downlink common signal and associated communication device

This application claims the priority of the Chinese patent application with the application number 202210200275.4 and the title of the invention "Method for generating downlink public signal and associated communication device" submitted to the China Patent Office on March 2, 2022, the entire content of which Incorporated in this application by reference.

technical field

The present disclosure relates to the field of communication, and more particularly, to a method for generating a downlink common signal and an associated communication device.

Background technique

The access network device usually needs to send a downlink public signal to the terminal device. For example, in a Long Term Evolution (LTE) system, an access network device may send a primary synchronization signal (primary synchronization signal, PSS), a secondary synchronization signal (secondary synchronization signal, SSS) and a broadcast channel ( The downlink public signal of physical broadcast channel, PBCH) information. In the LTE system, the downlink common signal is located at the center of the carrier, and its period is fixed. When the access network device transmits the downlink public signal, it uses an omnidirectional antenna to transmit without performing beamforming (beamforming). In a new radio (new radio, NR) system, the downlink common signal sent by the access network device may also include a demodulation reference signal (demodulation reference signal, DMRS) for the PBCH. Furthermore, NR uses more antennas to enhance coverage, but more antennas will cause antenna radiation to be very narrow beams, and it is difficult for a single narrow beam to cover the entire cell. At the same time, due to hardware limitations, access network equipment often cannot transmit multiple beams covering the entire cell at the same time, so NR introduces the method of beam sweeping to cover the entire cell, that is, the access network device at a certain moment One beam direction can be sent, and different beams can be sent at multiple times to cover the direction required by the entire cell. As shown in FIG. 1 , the access network device 120 can switch between beams (for example, beam 110-1, beam 110-2, and beam 110-3), so as to realize the transmission of different beams at multiple times to cover the entire cell. direction needed. In each beam, PSS, SSS, PBCH and DMRS must be configured so that terminal equipment can achieve downlink synchronization, and PSS/SSS/PBCH/DMRS must be sent at the same time. In the NR system, PSS/SSS, PBCH and DMRS for PBCH are bundled and designed to ensure simultaneous delivery. They are collectively referred to as synchronization signal blocks (SS/PBCH block, SSB), and the corresponding beams are called SSB beams. In addition, PSS/SSS/PBCH/DMRS can be generated using a pseudo-random sequence.

In addition, as the energy consumption of access network equipment continues to rise, the energy consumption of access network equipment has become one of the main reasons for the high operating costs of operators. How to reduce the energy consumption of access network equipment has become an urgent problem to be solved.

Contents of the invention

Example embodiments of the present disclosure provide a solution for downlink common signal generation. In the field of communication, one energy-saving method can be to turn off symbols. SSB is a common downlink common signal in NR systems. SSB signals of different beams are conventionally sent through time-division multiplexing (TDM). In order to increase the chance of symbols being turned off, the transmission of the SSB can be combined with Frequency-division multiplexing (FDM) technology to reduce the symbol overhead in the time domain. As shown in Figure 2, the original 8TDM SSB can be changed to 2FDM+4TDM SSB after combining FDM technology, thus reducing the time domain overhead of SSB by half. Further, better application of FDM technology to downlink public signals needs to be considered.

In a first aspect of the present disclosure, a method for communication is provided. The method includes that the access network device determines the Frequency domain resources for sending downlink common signals. The downlink common signal includes at least one of the following: a primary synchronization signal, a secondary synchronization signal, information of the physical broadcast channel, and a demodulation reference signal for the physical broadcast channel. At least one of the following is generated based on the frequency domain information of frequency domain resources: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the sequence of the demodulation reference signal used for the physical broadcast channel . The method also includes sending the generated downlink common signal on the frequency domain resource by the access network device. In this way, the data of multiple common signals occupying different frequency domain resources in the same time domain changes with the frequency domain information, thereby reducing the peak-to-average power ratio and the probability of nonlinear distortion of the signal.

In some embodiments, the access network device generating the sequence of the downlink common signal includes: generating the first M sequence from the first primitive polynomial. Generating the sequence of the downlink public signal by the access network device further includes: performing cyclic shift on the generated first M sequence based on the first sequence shift formula. The generation of the downlink public signal by the access network device further includes: processing the cyclically shifted first M sequence to generate a sequence of the primary synchronization signal. At least one of the first sequence shift formula or the initial value of the first M sequence is associated with a frequency offset. The frequency offset is the offset of the frequency domain resources relative to the reference position in the frequency domain. In this way, it is achieved that the sequence of the primary synchronization signal is generated from the frequency domain information.

In some embodiments, the shift formula of the first sequence is y(n)=x(n+m), _NFDM is the relative offset value of the frequency offset. In some embodiments, the shift formula of the first sequence is y(n)=x(n+m), Δf _FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used for sending downlink common signals. The way of introducing a frequency offset into the sequence shift formula can intuitively change the generated sequence, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the initial value of the first M sequence is determined based on a relative offset value of the frequency offset. In some embodiments, the initial value of the first M sequence is determined based on the actual frequency offset of the frequency offset. The method of introducing the frequency offset into the initial value can simplify the modification of the current system, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the access network device generating the sequence of the downlink common signal includes: generating the second M sequence from the second primitive polynomial. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated second M sequence based on the second sequence shift formula. The generating of the downlink common signal by the access network device further includes: generating a third M sequence from a third primitive polynomial. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated third M sequence based on the third sequence shift formula. The generation of the downlink common signal by the access network device further includes: processing the cyclically shifted second M sequence and the cyclically shifted third M sequence to generate a secondary synchronization signal sequence. At least one of the second sequence shift formula, the third sequence shift formula, the initial value of the second M sequence, or the initial value of the third M sequence is associated with a frequency offset, and the frequency offset is the frequency domain resource in The offset from the reference position in the frequency domain. In this way, it is realized that the sequence of the secondary synchronization signal is generated according to the frequency domain information.

In some embodiments, the shift formula of the second sequence is y ₀ (n)=x ₀ (n+m ₀ ), _NFDM is the relative offset value of the frequency offset. In some embodiments, the shift formula of the second sequence is y ₀ (n)=x ₀ (n+m ₀ ), Δf _FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used for sending downlink common signals. The way of introducing a frequency offset into the sequence shift formula can intuitively change the generated sequence, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the third sequence shift formula is y ₁ (n)=x ₁ (n+m ₁ ), _NFDM is the relative offset value of the frequency offset. In some embodiments, the third sequence shift formula is y ₁ (n)=x ₁ (n+m ₁ ), Δf _FDM is the actual frequency offset Frequency offset, C is the interval between different frequency domain resources used to send downlink common signals.

In some embodiments, the initial value of at least one of the second M-sequence and the third M-sequence is determined based on a relative offset value of the frequency offset. In some embodiments, the initial value of at least one of the second M sequence and the third M sequence is determined based on an actual frequency offset amount of the frequency offset. The method of introducing the frequency offset into the initial value can simplify the modification of the current system, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the access network device generating the sequence of the downlink common signal includes: generating a fourth M sequence from a fourth primitive polynomial. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated fourth M sequence based on the fourth sequence shift formula. The generation of the downlink common signal by the access network device further includes: generating a fifth M sequence from a fifth primitive polynomial; and performing cyclic shift on the generated fifth M sequence based on a shift formula of the fifth sequence. The generation of the downlink common signal by the access network device further includes: and processing the cyclically shifted fourth M sequence and the cyclically shifted fifth M sequence to generate a sequence of demodulation reference signals of the physical broadcast channel. At least one of the fourth sequence shift formula, the fifth sequence shift formula, the initial value of the fourth M sequence, or the initial value of the fifth M sequence is associated with a frequency offset, and the frequency offset is the frequency domain resource in The offset from the reference position in the frequency domain. In this way, it is realized that a sequence of demodulation reference signals of a physical broadcast channel is generated according to frequency domain information.

In some embodiments, at least one of the fourth sequence shift formula and the fifth sequence shift formula is y(n)=x(n+N _FDM +1600), where _NFDM is the relative offset of the frequency offset transfer value. In some embodiments, at least one of the fourth sequence shift formula and the fifth sequence shift formula is . Δf _FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used for sending downlink common signals. The way of introducing a frequency offset into the sequence shift formula can intuitively change the generated sequence, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the initial value of the fourth M-sequence is determined based on a relative offset value of the frequency offset. In some embodiments, the initial value of the fourth M sequence is determined based on the actual frequency offset of the frequency offset. In some embodiments, the initial value of the fifth M-sequence is determined based on a relative offset value of the frequency offset. In some embodiments, the initial value of the fifth M sequence is determined based on the actual frequency offset of the frequency offset. The method of introducing the frequency offset into the initial value can simplify the modification of the current system, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the access network device generating the sequence of the downlink common signal includes: generating a sixth M sequence from a sixth primitive polynomial. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated sixth M sequence based on the sixth sequence shift formula. Generating the downlink common signal by the access network device further includes: generating a seventh M sequence from the seventh primitive polynomial. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated seventh M sequence based on the seventh sequence shift formula. The generation of the downlink common signal by the access network device further includes: processing the cyclically shifted sixth M sequence and the cyclically shifted seventh M sequence to generate the first sequence. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the first sequence based on the eighth sequence shift formula including the frequency offset to generate a sequence of demodulation reference signals of the physical broadcast channel. The frequency offset is the offset of the frequency domain resources relative to the reference position in the frequency domain. In this way, it is realized that a sequence of demodulation reference signals of a physical broadcast channel is generated according to frequency domain information.

In some embodiments, the shifting formula of the eighth sequence is c(n)=c(n+ _NFDM ), where _NFDM is the relative offset value of the frequency offset. In some embodiments, the eighth sequence shift formula is Where Δf _FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used for sending downlink common signals. The way of introducing a frequency offset into the sequence shift formula can intuitively change the generated sequence, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the sequence of generating the downlink public signal by the access network device includes: generating the first polynomial from the eighth primitive polynomial Eight M sequences. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated eighth M sequence based on the shift formula of the eighth sequence. The generating of the downlink common signal by the access network device further includes: generating a ninth M sequence from the ninth primitive polynomial. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated ninth M sequence based on the shift formula of the ninth sequence. The generation of the downlink common signal by the access network device further includes: adding the cyclically shifted eighth M sequence and the cyclically shifted ninth M sequence to generate the second sequence. The generation of the downlink common signal by the access network device further includes: performing cyclic shift on the generated second sequence based on the tenth sequence shift formula. The generation of the downlink public signal by the access network device further includes: adding the second sequence to the data to be scrambled on the physical broadcast channel modulo 2 to generate data of the scrambled physical broadcast channel. The shift formula of the eighth sequence, the shift formula of the ninth sequence, the shift formula of the tenth sequence, the initial value of the eighth M sequence, or at least one of the initial values of the ninth M sequence is associated with a frequency offset, and the frequency offset Shift is the offset of the frequency domain resource relative to the reference position in the frequency domain. In this way, it is achieved that the data of the scrambled physical broadcast channel is generated according to the frequency domain information.

In some embodiments, at least one of the eighth sequence shift formula and the ninth sequence shift formula is y(n)=x(n+N _FDM +1600), where _NFDM is the relative offset of the frequency offset transfer value. In some embodiments, at least one of the eighth sequence shift formula and the ninth sequence shift formula is Where Δf _FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used for sending downlink common signals. The way of introducing a frequency offset into the sequence shift formula can intuitively change the generated sequence, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the shift formula of the tenth sequence is c(n)=c(n+vM _bit +N _FDM ), where v represents the lowest 2 bits of the index of the downlink common signal or the lowest bit of the index of the downlink common signal 3 bits, _NFDM indicates a relative offset value of the frequency offset, and M _bit indicates the number of bits of data to be scrambled. In some embodiments, the shift formula of the tenth sequence is Where v represents the lowest 2 bits of the index of the downlink common signal or the lowest 3 bits of the index of the downlink common signal, Δf _FDM represents the actual frequency offset of the frequency offset, and M _bit represents the number of bits of data to be scrambled. The way of introducing a frequency offset into the sequence shift formula can intuitively change the generated sequence, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In some embodiments, the initial value of the eighth M-sequence is determined based on a relative offset value of the frequency offset. In some embodiments, the initial value of the eighth M sequence is determined based on the actual frequency offset of the frequency offset. In some embodiments, the initial value of the ninth M-sequence is determined based on a relative offset value of the frequency offset. In some embodiments, the initial value of the ninth M sequence is determined based on the actual frequency offset of the frequency offset. The method of introducing the frequency offset into the initial value can simplify the modification of the current system, and introducing different frequency offsets can adapt to different downlink common signal frequency division multiplexing transmission schemes.

In a second aspect of the present disclosure, a method for communication is provided. The method includes a terminal device receiving downlink data from an access network device. The method further includes the terminal device determining the sequence set of the downlink common signal at the frequency domain position based on the frequency domain information of the frequency domain resource where the downlink data is located. The sequence set of the downlink public signal includes at least one of the following sequences generated based on the frequency domain information of the frequency domain resource: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the information used for the physical broadcast channel The sequence of the demodulation reference signal. In this way, the terminal device can determine the possible sequence set of the downlink public signal through the frequency domain information of the scanned downlink public signal, thereby reducing the number of sequence comparisons.

In some embodiments, the frequency domain information of the frequency domain resource is an offset of the frequency domain resource relative to a reference position in the frequency domain. In this way, more flexible adaptation to communication systems is possible.

In a third aspect of the present disclosure, a chip is provided, the chip includes a processor, and may also include a memory, the processor is coupled to the memory, and is used to execute computer programs or instructions stored in the memory, so that the chip implements the aforementioned first aspect or A method in any possible implementation of any aspect of the second aspect.

In a fourth aspect of the present disclosure, a computer program product is provided. The computer program product is tangibly stored on a computer-readable medium and includes computer-executable instructions that, when executed, cause the device to implement any of the possible functions according to any one of the above-mentioned first or second aspects. The operation of the method in the implementation.

In a fifth aspect of the present disclosure, a computer readable storage medium is provided. The computer-readable storage medium stores instructions, and when the instructions are executed by the processor of the device, the device implements the method in any one of the possible implementations according to any one of the first aspect or the second aspect above operation.

In a sixth aspect of the present disclosure, the present application further provides a communication device, which can implement the access network device of the method provided in the first aspect above. The communication device may be, for example, a base station, or a baseband device in a base station. The communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units or modules corresponding to the above functions. In a possible implementation manner, the communication device includes: a processor, where the processor is configured to support the communication device to perform corresponding functions of the access network device in the methods shown above. Optionally, the communication device may further include a memory, which may be coupled with the processor, and store necessary program instructions and data of the communication device. Optionally, the communication device further includes an interface circuit, where the interface circuit is used to support communication between the communication device and devices such as terminal equipment and core network equipment. In a possible implementation manner, the communication device includes corresponding functional modules, respectively configured to implement the steps in the above method. The functions may be implemented by hardware, or may be implemented by executing corresponding software through hardware. Hardware or software includes one or more modules corresponding to the above-mentioned functions. For example, the communication device includes a sending unit (sometimes also called a sending module) and a determining unit (sometimes also called a determining module), and these units can perform corresponding functions in the above method example, for example, when implementing the method provided by the first aspect, The determining unit is used for determining frequency domain resources used for sending downlink common signals. The downlink common signal includes at least one of the following: a primary synchronization signal, a secondary synchronization signal, information of the physical broadcast channel, and a demodulation reference signal for the physical broadcast channel. At least one of the following is generated based on the frequency domain information of frequency domain resources: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the sequence of the demodulation reference signal used for the physical broadcast channel . The sending unit is used for sending the generated downlink common signal on frequency domain resources. For details, refer to the description in the method provided in the first aspect, and details are not repeated here.

In a seventh aspect of the present disclosure, a communication device is provided. The present application also provides a communication device, which can realize the access network device of any method provided in the sixth aspect. The communication device may be, for example, a terminal device. The communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units or modules corresponding to the above functions. In a possible implementation manner, the communication device includes: a processor, where the processor is configured to support the communication device to execute corresponding functions of the terminal device in the methods shown above. Optionally, the communication device may further include a memory, which may be coupled with the processor, and store necessary program instructions and data of the communication device. Optionally, the communication device further includes an interface circuit, where the interface circuit is used to support communication between the communication device and equipment such as access network equipment and core network equipment. In a possible implementation manner, the communication device includes corresponding functional modules, respectively configured to implement the steps in the above method. The functions may be implemented by hardware, or may be implemented by executing corresponding software through hardware. Hardware or software includes one or more modules corresponding to the above-mentioned functions. For example, the communication device includes a receiving unit (sometimes also called a receiving module) and a determining unit (sometimes also called a determining module), and these units can perform corresponding functions in the above method example, for example, when implementing the method provided by the second aspect, The receiving unit is used for receiving downlink data from the access network equipment. The determining unit is configured to determine the sequence set of the downlink common signal at the frequency domain position based on the frequency domain information of the frequency domain resource where the downlink data is located. At least one of the following is generated based on the frequency domain information of frequency domain resources: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the sequence of the demodulation reference signal used for the physical broadcast channel . For details, refer to the description in the method provided by the second aspect, which will not be repeated here.

Description of drawings

The features, advantages and other aspects of various implementations of the present disclosure will become more apparent with reference to the following detailed description when taken in conjunction with the accompanying drawings. Several implementations of the present disclosure are shown here by way of illustration and not limitation, in the accompanying drawings:

FIG. 1 shows a schematic diagram of an access network device configured with multiple beams;

FIG. 2 shows a schematic diagram of common signal transmission combining TDM technology and FDM technology;

Figure 3 shows a schematic block diagram of a communication system in which embodiments of the present disclosure may be implemented;

Figure 4A shows a schematic diagram of FDM SSB signal transmission;

Figure 4B shows a schematic diagram of FDM SSB beam scanning;

FIG. 5 shows an interactive signaling diagram of a communication process according to some embodiments of the present disclosure;

6A-6D respectively show a flowchart of sequence generation of common signals according to some embodiments of the present disclosure;

FIG. 7A-FIG. 7D respectively show schematic diagrams of sequence generation of common signals according to some embodiments of the present disclosure;

Fig. 8 shows a flowchart implemented at an access network device according to some embodiments of the present disclosure;

Fig. 9 shows a flowchart implemented at a terminal device according to some embodiments of the present disclosure;

Figures 10A and 10B respectively show simplified block diagrams of example devices suitable for implementing embodiments of the present disclosure; and

11 is a simplified block diagram of an example device suitable for implementing embodiments of the present disclosure.

In the various drawings, the same reference numerals denote the same elements.

Detailed ways

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; A more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for exemplary purposes only, and are not intended to limit the protection scope of the present disclosure.

In the description of the embodiments of the present disclosure, the term "comprising" and its similar expressions should be interpreted as an open inclusion, that is, "including but not limited to". The term "based on" should be understood as "based on at least in part". The term "one embodiment" or "the embodiment" should be read as "at least one embodiment". In the embodiment of the present application, for a technical feature, the technical features of this technical feature are distinguished by "first" and "second", etc., and there is no difference between the technical features described by "first" and "second". sequence or order of magnitude. Other definitions, both express and implied, may also be included below.

Embodiments of the present disclosure may be implemented according to any suitable communication protocol, including, but not limited to, cellular communication protocols such as Fourth Generation (4G) and Fifth Generation (5G), such as the Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 and other wireless local area network communication protocols, and/or any other protocols currently known or developed in the future. The technical solutions of the embodiments of the present disclosure are applied to any appropriate communication system, for example: General Packet Radio Service (General Packet Radio Service, GPRS), Long Term Evolution (Long Term Evolution, LTE) system, Frequency Division Duplex (Frequency Division Duplex) , FDD) system, time division duplex (Time Division Duplex, TDD), universal mobile communication system (Universal Mobile Telecommunications Service, UMTS), narrowband Internet of Things (Narrowband Internet Of Things, NB-IoT) communication system, the future fifth generation (5G) system or New Radio (New Radio, NR), etc.

For the purpose of illustration, embodiments of the present disclosure are described below with a 5G 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) communication system as a background. However, it should be understood that the embodiments of the present disclosure are not limited to the 3GPP communication system applied to 5G, but can be applied to any communication system with similar problems, such as wireless local area network (Wireless Local Area Network, WLAN), wired communication system, or future development other communication systems, etc.

The term "terminal device" used in this disclosure refers to any terminal device capable of wired or wireless communication with network devices. The terminal equipment involved in this embodiment of the present application can also be referred to as a terminal, which can be a device with a wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on water (such as Ships, etc.); can also be deployed in the air (such as aircraft, balloons and satellites, etc.). The terminal device may be user equipment (User Equipment, UE), where the UE includes a handheld device with a wireless communication function, a vehicle device, a wearable device, or a computing device. Exemplarily, the UE may be a mobile phone (Mobile Phone), a tablet computer or a computer with a wireless transceiver function. Terminal devices can also be virtual reality (Virtual Reality, VR) terminal devices, augmented reality (Augmented Reality, AR) terminal devices, wireless terminals in industrial control, wireless terminals in unmanned driving, wireless terminals in telemedicine, smart Wireless terminals in power grids, wireless terminals in Smart City, wireless terminals in Smart Home, etc. In the embodiment of the present application, the device for realizing the function of the terminal may be a terminal; it may also be a device capable of supporting the terminal to realize the function, such as a chip system, and the device may be installed in the terminal. In the embodiment of the present application, the system-on-a-chip may be composed of chips, or may include chips and other discrete devices. In the technical solutions provided by the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described by taking the terminal as an example in which the device for realizing the functions of the terminal is a terminal and the terminal is a UE.

The term "network device" as used in this disclosure is an entity or node that can be used to communicate with end devices. The network devices involved in the embodiments of the present application include access network devices. For example, a base station may be a device deployed in a wireless access network and capable of performing wireless communication with a terminal. Among them, the base station may have various forms, such as a macro base station, a micro base station, a relay station, and an access point. Exemplarily, the base station involved in this embodiment of the present application may be a base station in 5G or a base station in LTE, where the base station in 5G may also be called a transmission reception point (Transmission Reception Point, TRP) or gNB. In the embodiment of the present application, the device for realizing the function of the network device may be a network device; it may also be a device capable of supporting the network device to realize the function, such as a chip system, and the device may be installed in the network device. In the technical solutions provided by the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described by taking the apparatus for realizing the functions of the network equipment as network equipment and taking the network equipment as a base station as an example.

The term "core network (Core Network, CN) device" used in this disclosure may mean that CN devices correspond to different devices in different systems. For example, in the third generation (Third Generation, 3G) communication system, it can correspond to the serving support node (Serving GPRS Support Node, SGSN) of General Packet Radio Service (General Packet Radio Service, GPRS) and/or the gateway support node of GPRS ( Gateway GPRS Support Node, GGSN). In the 4G communication system, it may correspond to a Mobility Management Entity (MME) and/or a Serving Gateway (S-GW). In the 5G communication system, it can correspond to the access and mobility management function (Access and Mobility Management Function, AMF), the session management function (Session Management Function, SMF) or the user plane function (User plane Function, UPF).

The technical solutions provided by the embodiments of the present application may be applied to wireless communication between communication devices. Wireless communication between communication devices may include: wireless communication between network devices and terminals, wireless communication between network devices and network devices, and wireless communication between terminals. Wherein, in the embodiment of the present application, the term "wireless communication" may also be referred to as "communication" for short, and the term "communication" may also be described as "data transmission", "information transmission" or "transmission".

As mentioned above, the downlink common signal may include PSS. When a terminal device enters the NR system, it first searches for the PSS. At this stage, the terminal equipment searches for cells on a given carrier frequency. Once the terminal equipment detects the PSS, the terminal equipment synchronizes to the PSS period. The downlink common signal may also include SSS. Once the terminal device detects the PSS, it also knows the sending timing of the SSS. By detecting the SSS, the terminal device can determine the physical cell identifier (physical cell identifier, PCI). The downlink common signal may also include PBCH information. The information carried by the PBCH is called the master system information block (Master Information Block, MIB), including the system frame number, cell block ID, system information block (system information block, SIB) parameter set and other information. Get the rest of the system information for the webcast. The downlink common signal may also include DMRS for PBCH.

In addition, FDM technology can be applied to the transmission of downlink common signals. However, when multiple downlink common signals of a cell are sent in the same time domain resource through FDM, since the data in each downlink common signal is basically the same, multiple superimposed signals in OFDM symbols will be modulated by the same initial phase signal, resulting in Larger instantaneous power peak, resulting in a higher peak-to-average power ratio (Peak to Average Power Ratio, PARP), makes the signal easily enter the nonlinear region of the power amplifier, resulting in nonlinear distortion of the signal. Therefore, it is necessary to design a new method for generating downlink common signals, so that multiple downlink common signals transmitted on the same time domain resource have certain differences in data, thereby reducing PAPR.

In order to at least partly solve the above problems and other potential problems, it is necessary to propose a new method for generating a downlink common signal. According to an embodiment of the present disclosure, the network device generates the sequence in the downlink public signal based at least on the basis of the frequency domain information of the frequency domain resources used to send the downlink public signal, so that the sequence generation formulas of different frequency offset positions are different, so the data are also different . Thus, the data of multiple downlink common signals occupying different frequency domain resources in the same time domain changes with frequency domain information, thereby reducing the peak-to-average power ratio and avoiding nonlinear distortion of signals. The terminal device can determine the possible sequence set of the downlink public signal by scanning the frequency offset position of the downlink public signal, thereby reducing the complexity of sequence comparison.

FIG. 3 shows a schematic diagram of a communication system 300 in which embodiments of the present disclosure may be implemented. The communication system 300 includes a terminal device 310-1, a terminal device 310-2, ..., a terminal device 310-N, which may be collectively referred to as "terminal devices 310", where N is any positive integer. The communication system 300 as part of a communication network also includes an access network device 320 . The terminal device and the access network device can communicate with each other. Terminal device 310 may also receive messages from core network devices. The term "entity" used herein refers to a network element that can implement a specific function. As shown in FIG. 3 , the terminal device 3310 communicates with the access network device 320 (ie, via a Uu link). The term "uplink (UL) data" used herein refers to data sent by a terminal device to a network device. The term "downlink (Downlink, DL) data" used herein refers to data sent by a network device to a terminal device.

Communication system 300 may include any suitable number of devices and cells. In the communication system 300, the terminal device 310 and the access network device can communicate data and control information with each other. It should be understood that the number of various devices and their connections shown in FIG. 3 are given for illustrative purposes and no limitation is suggested. Communication system 300 may include any suitable number of devices and networks suitable for implementing embodiments of the present disclosure.

4A and 4B illustrate scenarios to which embodiments of the present disclosure can be applied. FIG. 4A shows a schematic diagram of sending downlink common signals by using FDM. In the scenario shown in FIG. 4A , the terminal device may know the frequency offset information of the downlink public signal. The frequency offset information is expressed as when using FDM technology to send n downlink common signals, n downlink common signals occupy n frequency domain resources on the same time domain resource, based on the frequency domain position of one of the frequency domain resources, and n- The frequency domain offset of one frequency domain resource relative to the reference position is referred to as frequency offset information of the FDM downlink common signal. As shown in FIG. 4A , frequency domain resources that can be used for sending downlink common signals include frequency domain resources 40 , frequency domain resources 41 , frequency domain resources 42 and frequency domain resources 43 . If the starting frequency point 400 of the frequency domain resource 40 is used as the reference position, the frequency offset of the frequency domain resource 41 relative to the reference position is the frequency offset 410 . The frequency offset of the frequency domain resource 42 relative to the reference position is the frequency offset 420 . The frequency offset of the frequency domain resource 43 relative to the reference position is the frequency offset 430 . Figure 4B shows a schematic diagram of FDM SSB beam scanning. The scenario shown in FIG. 4B is applicable to the unknown frequency offset information of the terminal device. It can be understood that the number of frequency domain resources and the number of beams shown in FIG. 4A and FIG. 4B are only exemplary and not limiting.

Exemplary embodiments of the present disclosure will be discussed in detail below with reference to the accompanying drawings. For ease of discussion, the paging process and signaling interaction between communication entities according to an example embodiment of the present disclosure will be described with reference to the example communication system of FIG. 3 . It should be understood that the exemplary embodiments of the present disclosure may be similarly applied in other communication systems.

Figure 5 shows a signaling diagram of an interaction 500 of a communication process for paging according to some embodiments of the present disclosure. The interaction 500 involves a terminal device and a core network device, for example, a terminal device 310-1 and a core network device 320 as shown in FIG. 3 .

The core network device determines (5010) frequency domain resources for sending downlink common signals. As shown in FIG. 4A , frequency domain resources that can be used for sending downlink common signals include frequency domain resources 40 , frequency domain resources 41 , frequency domain resources 42 and frequency domain resources 43 . The core network device may determine frequency domain resources used for sending downlink common signals from these frequency domain resources.

The core network device generates (5020) a sequence set of downlink common signals based on at least the determined frequency domain information of the frequency domain resources. The frequency domain information may be an offset of the determined frequency domain resource relative to a reference position in the frequency domain. In some embodiments, the reference position may be a starting frequency point of any one of the frequency domain resources capable of sending downlink synchronization signals. For example, as shown in FIG. 4A , the reference position may be the starting frequency point 400 of the frequency domain resource 40, the starting frequency point 401 of the frequency domain resource 41, the starting frequency point 402 of the frequency domain resource 42, and the starting frequency point 402 of the frequency domain resource 43. Any one of the starting frequency points 403. Optionally, the reference position may be any frequency point in the frequency domain. For example, as shown in FIG. 4A , the reference position may be frequency point 404 . For the purpose of illustration only, the frequency point 400 is used as the reference position below to describe the embodiment of the present disclosure. In some embodiments, intervals between different frequency domain resources used for sending the downlink common signal may be the same. For example only, the values of the frequency offset 410, the frequency offset 420, and the frequency offset 430 may be incrementally increased, for example, 20 resource blocks (resource block, RB), 40 RBs, and 60 RBs, respectively. Optionally, intervals between different frequency domain resources used for sending the downlink common signal may be different. For example, the values of frequency offset 410, frequency offset 420, and frequency offset 430 may be any suitable number of resource blocks. It can be understood that the above value of the frequency offset is only exemplary rather than limiting.

In some embodiments, the core network device may generate a sequence set of downlink common signals based on the actual frequency offset of the frequency offset. For example, referring to FIG. 4A , if the determined frequency domain resource is frequency domain resource 41 and the reference position is frequency point 400 , the core network device may generate a sequence set of downlink common signals based on frequency offset 410 . As an example only, if the frequency offset 410 is 20 resource blocks (resource block, RB), the core network device may generate a sequence set of downlink common signals based on 20 RBs. In this manner, it is realized that downlink common signals on different frequency domain resources have different sequence sets, and excessive PARP is avoided.

In some other embodiments, the core network device may generate the sequence set of the downlink public signal based on the relative offset value of the frequency offset. As an example only, as shown in FIG. 4A, when the reference position is the frequency point 400, the frequency offset 410 of the frequency domain resource 41 is 20 RBs, the frequency offset 420 of the frequency domain resource 42 is 40 RBs, and the frequency offset 420 of the frequency domain resource 43 is The frequency offset 430 is 60 RBs, the relative offset value of the frequency offset 410 may be 1, the relative offset value of the frequency offset 420 may be 2, and the relative offset value of the frequency offset 430 may be 3. In this case, if the determined frequency domain resource is the frequency domain resource 41, the core network device may generate the sequence set of the downlink common signal based on the relative offset value 1. If the determined frequency domain resource is the frequency domain resource 42, the core network device may generate the sequence set of the downlink common signal based on the relative offset value 2. In this manner, different downlink common signal frequency division multiplexing transmission schemes can be more flexibly applied.

In some embodiments, frequency domain information of frequency domain resources may be predetermined at the core network device and the terminal device. For example, the relative offset value and/or the actual offset value of the frequency offset may be predetermined. Optionally, the frequency domain information of the frequency domain resources may be included in the system information.

The downlink common signal includes one or more of PSS, SSS, PBCH information and DMRS for PBCH. Therefore, the core network device generates one or more items of the PSS sequence, the SSS sequence, the scrambled PBCH information, and the DMRS sequence for the PBCH based on the determined frequency domain information of the frequency domain resource. In some embodiments, the core network The device can apply frequency domain information to the initial value of the sequence or to a polynomial that generates the sequence. Optionally, the core network device may apply the frequency domain information to the cyclic shift process. Generation of downlink common signals according to some embodiments of the present disclosure will be described later with reference to FIGS. 6A-6D and FIGS. 7A-7D .

The core network device sends (5030) a downlink common signal on the determined frequency domain resource. For example, a core network device may send downlink public signals to multiple terminal devices it serves. In other words, the core network equipment can broadcast the downlink common signal.

The terminal device determines (5040) the sequence set of the downlink common signal. In some embodiments, the terminal device searches for the downlink common signal at the frequency domain position where the downlink common signal may appear. In this case, if the terminal device receives downlink data from the core network device at a certain frequency domain position, the terminal device determines the sequence set of the downlink common signal at the frequency domain position based on the frequency information of the frequency domain position. In some other embodiments, the terminal device may first determine the frequency domain position where the downlink common signal is to be received. In this case, the terminal device monitors and receives downlink data at the frequency domain position. The terminal device determines the sequence set of the downlink common signal based on the frequency information of the frequency domain position. The terminal device can perform a correlation comparison between the received downlink data and the sequences in the downlink public signal sequence set. If the correlation satisfies the predetermined condition, the terminal device has received the downlink public signal corresponding to the frequency domain position. If the correlation does not satisfy the predetermined condition, the terminal device does not receive the downlink public signal corresponding to the frequency domain position.

In some embodiments, the terminal device may not be able to obtain the frequency offset information. In this case, the terminal device needs to perform a correlation comparison between the received downlink data and all possible sequences. For example, the terminal device may first use any possible frequency offset information to perform a correlation comparison with the sequence generated by the downlink data. If the correlation does not meet the predetermined conditions, the terminal device can use the sequence generated based on any other possible frequency offset information (and compare the correlation with the downlink data. By analogy, until the correlation meets the predetermined conditions, or all possible sequences are used.

The generation of downlink common signals according to some embodiments of the present disclosure is described below with reference to FIGS. 6A-6D and FIGS. 7A-7D .

FIG. 6A shows a flowchart of a method 601 for generating a sequence of PSSs according to some embodiments of the present disclosure. Method 601 can be implemented at core network device 320 as shown in FIG. 3 .

At block 6011, the core network device generates a first M sequence from the first primitive polynomial. The term "primitive polynomial" used in this article is a mathematical concept that is the only polynomial that decomposes a full ring such that the greatest common factor of all coefficients is 1. Primitive polynomials are not equal to zero, and polynomials accompanying primitive polynomials are still primitive polynomials. For example, the first primitive polynomial may be x ⁷ +x ⁴ +1, and the length of the first M sequence may be 127. In some embodiments, the initial value of the first M sequence may be a predefined value, which is not associated with a frequency offset. In other embodiments, the initial value of the first M-sequence may be associated with a frequency offset. For example, the initial value of the first M sequence can be changed as the frequency offset changes. In other words, the initial value of the first M sequence may be a function of the frequency offset value. In some embodiments, the initial value of the first M sequence is determined based on the relative offset value of the frequency offset. As an example only, the initial value of the first M sequence can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. understandable, can be any suitable function formula. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. For example, if the value of _NFDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of _NFDM is 1, it means that the frequency offset degree of the determined frequency domain resources relative to the reference position is 1, and the actual frequency offset value can be determined according to specific parameters. Optionally, the initial value of the first M sequence is determined based on an actual frequency offset of the frequency offset. For example, the initial value of the first M sequence can be expressed as Wherein Δf _FDM is the actual frequency offset degree of the determined frequency domain resources. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. For example, if the value of Δf _FDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of Δf _FDM is 20RB, it means that the determined frequency domain The offset of the resource relative to the reference position is 20RB. In this way, it is realized that the initial value of the sequence is changed with the change of the frequency offset, so that the generated PSS sequence is changed with the change of the frequency offset, and the nonlinear distortion caused by too high PARP is avoided.

At block 6012, the core network device cyclically shifts the first M sequence based on the first sequence shift formula. In some embodiments, the first sequence shift formula can be predefined, which is not associated with frequency offset. In other embodiments, the first sequence shift formula may be associated with a frequency offset. In other words, the shifting formula of the first sequence may change as the frequency offset changes, that is, the shifting formula of the first sequence may be a function of the frequency offset value. As an example only, the first sequence shift formula can be expressed as y(n)=x(n+m), in _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. is based on the cell ID. specifically, is the cell identification (ID). Optionally, the shift formula of the first sequence may be expressed as y(n)=x(n+m), in Δf _FDM is the actual frequency offset degree of the determined frequency domain resource. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. C represents the interval between different frequency domain resources used for sending downlink common signals. For example, if the interval between different frequency domain resources is 20RB, then C is 20RB. In some embodiments, intervals between different frequency domain resources may be different, and C may be a different value, for example, 10RB, 20RB, 30RB and so on.

At block 6013, the core network device processes the cyclically shifted first M sequence to generate a PSS sequence. In this way, the generation of the sequence of the PSS is associated with a frequency offset, avoiding excessively high peak-to-average power ratios.

As noted above, in some embodiments, the first sequence of shifting formulas may be associated with a frequency offset. As shown in FIG. 7A , the shift register 711 can be x(n+7)=[x(n+4)+x(n)] mod2. In some embodiments, the initial value of the shift register may be 1110110, that is, s ₆ =1, s ₅ =1, s ₄ =1, s ₃ =0, s ₂ =1, s ₁ =1, s ₀ =0. The sequence x(n) output by the shift register 711 can be circularly shifted (712). In some embodiments, the shift formula can be expressed as y(n)=x(n+m), cyclic shift bit. In other embodiments, the shift formula can be expressed as y(n)=x(n+m), cyclic shift bit. Sign conversion (713) is performed on the cyclically shifted sequence y(n) to generate a sequence of PSSs. For example, the formula for symbol conversion can be expressed as d _PSS (n)=1-2y(n), where n=0, 1, . . . , 126, and d _pss is the sequence of generated PSS.

As mentioned above, in some embodiments, the initial value of the first M-sequence may be associated with a frequency offset. In some embodiments, the initial value of the shift register can be expressed as Optionally, the initial value can be expressed as The sequence x(n) output by the shift register 711 can be circularly shifted (712). The shift formula can be expressed as y(n)=x(n+m), cyclic shift bit. Sign conversion (713) is performed on the cyclically shifted sequence y(n) to generate a sequence of PSSs. For example, the formula for symbol conversion can be expressed as d _PSS (n)=1-2y(n), where n=0, 1, . . . , 126, and d _pss is the sequence of generated PSS.

FIG. 6B shows a flowchart of a method 602 for generating a sequence of SSSs according to some embodiments of the present disclosure. The method 602 can be implemented at the core network device 320 as shown in FIG. 3 .

At block 6021, the core network device generates a second M-sequence from the second primitive polynomial. For example, the second primitive polynomial may be x ⁷ +x ⁴ +1, and the length of the second M sequence may be 127. In other embodiments, the initial value of the second M sequence may be a predefined value, which is not associated with a frequency offset. In some embodiments, the initial value of the second M-sequence may be associated with a frequency offset. For example, the initial value of the second M sequence can be changed as the frequency offset changes. In other words, the initial value of the second M sequence may be a function of the frequency offset value. In some embodiments, the initial value of the second M-sequence is determined based on the relative offset value of the frequency offset. As an example only, this initial value can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. understandable, can be any suitable function formula. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. For example, if the value of _NFDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of _NFDM is 1, it means that the frequency offset degree of the determined frequency domain resources relative to the reference position is 1, and the actual frequency offset value can be determined according to specific parameters. Optionally, the initial value of the second M sequence is determined based on the actual frequency offset of the frequency offset. For example, the initial value of the second M sequence can be expressed as Wherein Δf _FDM is the actual frequency offset degree of the determined frequency domain resources. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. For example, if the value of Δf _FDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of Δf _FDM is 20RB, it means that the determined offset of the frequency domain resource relative to the reference position is 20RB. In this way, it is realized that the initial value of the sequence is changed with the change of the frequency offset, so that the generated SSS sequence is changed with the change of the frequency offset, and the nonlinear distortion caused by too high PARP is avoided.

At block 6022, the core network device cyclically shifts the second M sequence based on the second sequence shift formula. In some embodiments, the second sequence shift formula can be predefined, which is not associated with frequency offset. In other embodiments, the second sequence shift formula may be associated with a frequency offset. In other words, the shifting formula of the second sequence may change as the frequency offset changes, that is, the shifting formula of the second sequence may be a function of the frequency offset value. As an example only, the second sequence shift formula can be expressed as y ₀ (n)=x ₀ (n+m ₀ ), in _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. and is determined based on the cell ID. specifically, is the cell ID. Optionally, the shift formula of the second sequence may be expressed as y ₀ (n)=x ₀ (n+m ₀ ), in Δf _FDM is the actual frequency offset degree of the determined frequency domain resources. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. C represents the interval between different frequency domain resources used for sending downlink common signals. For example, if the interval between different frequency domain resources is 20RB, then C is 20RB. In some embodiments, intervals between different frequency domain resources may be different, and C may be a different value, for example, 10RB, 20RB, 30RB and so on.

At block 6023, the core network device generates a third M-sequence from the third primitive polynomial. For example, the third primitive polynomial may be x ⁷ +x+1, and the length of the third M sequence may be 127. In other embodiments, the initial value of the third M sequence may be a predefined value, which is not associated with a frequency offset. In some embodiments, the initial value of the third M-sequence may be associated with a frequency offset. For example, the initial value of the third M sequence may be changed as the frequency offset changes. In other words, the initial value of the third M sequence may be a function of the frequency offset value. In some embodiments, the initial value of the third M-sequence is determined based on the relative offset value of the frequency offset. As an example only, this initial value can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. understandable, can be any suitable function formula. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. For example, if the value of _NFDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of _NFDM is 1, it means that the frequency offset degree of the determined frequency domain resources relative to the reference position is 1, and the actual frequency offset value can be determined according to specific parameters. Optionally, the initial value of the third M sequence is determined based on the actual frequency offset of the frequency offset. For example, the initial value of the third M sequence can be expressed as Wherein Δf _FDM is the actual frequency offset degree of the determined frequency domain resources. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. For example, if the value of Δf _FDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of Δf _FDM is 20RB, it means that the determined frequency domain resources relative to the reference position The offset is 20RB. In this way, it is realized that the initial value of the sequence is changed with the change of the frequency offset, so that the generated SSS sequence is changed with the change of the frequency offset, and the nonlinear distortion caused by too high PARP is avoided.

At block 6024, the core network device cyclically shifts the third M sequence based on the third sequence shift formula. In some embodiments, the third sequence shift formula can be predefined, which is not associated with frequency offset. In other embodiments, the third sequence shift formula may be associated with a frequency offset. In other words, the shifting formula of the third sequence may change as the frequency offset changes, that is, the shifting formula of the third sequence may be a function of the frequency offset value. As an example only, the third sequence shift formula can be expressed as y ₁ (n)=x ₁ (n+m ₁ ), in _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. and is determined based on the cell ID. specifically, is the cell ID. Optionally, the third sequence shift formula can be expressed as y ₁ (n)=x ₁ (n+m ₁ ), in Δf _FDM is the actual frequency offset degree of the determined frequency domain resource. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. C represents the interval between different frequency domain resources used for sending downlink common signals. For example, if the interval between different frequency domain resources is 20RB, then C is 20RB. In some embodiments, intervals between different frequency domain resources may be different, and C may be a different value, for example, 10RB, 20RB, 30RB and so on.

At block 6025, the core network device processes the cyclically shifted second M sequence and the cyclically shifted third M sequence to generate an SSS sequence. In this way, the generation of the sequence of the SSS is associated with a frequency offset, thereby avoiding an excessively high peak-to-average power ratio.

As noted above, in some embodiments, the second sequence of shifting formulas may be associated with a frequency offset. As shown in FIG. 7B , the shift register 721 can be x ₀ (n+7)=[x ₀ (n+4)+x ₀ (n)]mod2. In some embodiments, the initial value of the shift register may be 1110110, that is, s ₆ =1, s ₅ =1, s ₄ =1, s ₃ =0, s ₂ =1, s ₁ =1, s ₀ =0. The sequence x ₀ (n) output by the shift register 721 can be circularly shifted ( 722 ). In some embodiments, the shift formula can be expressed as y ₀ (n)=x ₀ (n+m ₀ ), the cyclic shift bit. In other embodiments, the shift formula can be expressed as y ₀ (n)=x ₀ (n+m ₀ ), the cyclic shift bit.

As mentioned above, in some embodiments, the initial value of the second M-sequence may be associated with a frequency offset. In some embodiments, the initial value of the shift register can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. Optionally, the initial value can be expressed as The sequence x ₀ (n) output by the shift register 721 can be circularly shifted ( 722 ). The shift formula can be expressed as y ₀ (n)=x ₀ (n+m ₀ ), cyclic shift bit.

In other embodiments, the third sequence shift formula may be associated with a frequency offset. As shown in FIG. 7B , the shift register 723 can be x ₁ (n+7)=[x ₁ (n+1)+x ₁ (n)]mod2. In some embodiments, the initial value of the shift register may be 0000001, that is, s ₆ =0, s ₅ =0, s ₄ =0, s ₃ =0, s ₂ =0, s ₁ =0, s ₀ =1. The sequence x ₁ (n) output by the shift register 723 can be circularly shifted (724). In some embodiments, the shift formula can be expressed as y ₁ (n)=x ₁ (n+m ₁ ), the cyclic shift bit. In other embodiments, the shift formula can be expressed as y ₁ (n)=x ₁ (n+m ₁ ), the cyclic shift bit.

As noted above, in some embodiments, the initial value of the third M-sequence may be associated with a frequency offset. In some embodiments, the initial value of the shift register can be expressed as Optionally, the initial value can be expressed as The sequence x ₁ (n) output by the shift register 723 can be circularly shifted (724). shift formula Can be expressed as y ₁ (n)=x ₁ (n+m ₁ ), cyclic shift bit.

The cyclically shifted sequence y ₀ (n) and the cyclically shifted sequence y ₁ (n) undergo sign conversion and addition to generate a sequence of SSS. For example, the formula of sequence addition and sign conversion can be expressed as d _SSS (n)=[1-2y ₀ (n) mod127][1-2y ₁ (n) mod127], where n=0, 1,... , 126, d _sss is the generated SSS sequence.

FIG. 6C shows a flowchart of a method 603 for generating a DMRS for PBCH according to some embodiments of the present disclosure. Method 603 can be implemented at core network device 320 as shown in FIG. 3 .

At block 6031, the core network device generates a fourth M-sequence from the fourth primitive polynomial. For example, the fourth primitive polynomial may be x ³¹ +x ³ +1, and the length of the fourth M sequence may be 127. In other embodiments, the initial value of the fourth M sequence may be a predefined value, which is not associated with a frequency offset. In some embodiments, the initial value of the fourth M-sequence may be associated with a frequency offset. For example, the initial value of the fourth M sequence can be changed as the frequency offset changes. In other words, the initial value of the fourth M sequence may be a function of the frequency offset value. In some embodiments, the initial value of the fourth M-sequence is determined based on the relative offset value of the frequency offset. As an example only, this initial value can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. understandable, can be any suitable function formula. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. For example, if the value of _NFDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of _NFDM is 1, it means that the frequency offset degree of the determined frequency domain resources relative to the reference position is 1, and the actual frequency offset value can be determined according to specific parameters. Optionally, the initial value of the fourth M sequence is determined based on an actual frequency offset of the frequency offset. For example, the initial value of the fourth M sequence can be expressed as Wherein Δf _FDM is the actual frequency offset degree of the determined frequency domain resources. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. For example, if the value of Δf _FDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of Δf _FDM is 20RB, it means that the determined offset of the frequency domain resource relative to the reference position is 20RB. In this way, it is realized that the initial value of the sequence is changed with the change of the frequency offset, so that the generated DMRS sequence of the PBCH is changed with the change of the frequency offset, and the nonlinear distortion caused by too high PARP is avoided.

At block 6032, the core network device cyclically shifts the fourth M sequence based on the fourth sequence shift formula. In some embodiments, the fourth sequence shift formula can be predefined, which is not associated with frequency offset. In other embodiments, the fourth sequence shift formula may be associated with a frequency offset. In other words, the shifting formula of the fourth sequence may vary with the frequency offset, that is, the shifting formula of the fourth sequence may be a function of the frequency offset value. As an example only, the fourth sequence shift formula can be expressed as y ₀ (n)=x ₀ (n+N _FDM +1600). _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. Optionally, the fourth sequence shift formula can be expressed as Δf _FDM is the actual frequency offset degree of the determined frequency domain resources. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. C represents the interval between different frequency domain resources used for sending downlink common signals. For example, if the interval between different frequency domain resources is 20RB, then C is 20RB. In some embodiments, intervals between different frequency domain resources may be different, and C may be a different value, for example, 10RB, 20RB, 30RB and so on.

At block 6033, the core network device generates a fifth M-sequence from the fifth primitive polynomial. For example, the fifth primitive polynomial may be x ³¹ +x ³ +x ² +x+1, and the length of the fifth M sequence may be 127. In other embodiments, the initial value of the fifth M sequence may be a predefined value, which is not associated with a frequency offset. In some embodiments, the initial value of the fifth M-sequence may be associated with a frequency offset. For example, the initial value of the fifth M sequence can be changed as the frequency offset changes. In other words, the initial value of the fifth M-sequence may be a function of the frequency offset value. In some embodiments, the initial value of the fifth M-sequence is determined based on the relative offset value of the frequency offset. As an example only, this initial value can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. Optionally, the initial value of the fifth M sequence is determined based on an actual frequency offset of the frequency offset. For example, the initial value of the fifth M sequence can be expressed as Wherein Δf _FDM is the actual frequency offset degree of the determined frequency domain resource. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. For example, if the value of Δf _FDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of Δf _FDM is 20RB, it means that the determined offset of the frequency domain resource relative to the reference position is 20RB. In this way, it is realized that the initial value of the sequence is changed with the change of the frequency offset, so that the generated DMRS sequence of the PBCH is changed with the change of the frequency offset, and the nonlinear distortion caused by too high PARP is avoided.

At block 6034, the core network device cyclically shifts the fifth M sequence based on the fifth sequence shift formula. In some embodiments, the fifth sequence shift formula may be predefined, which is not associated with a frequency offset. In other embodiments, the fifth sequence shift formula may be associated with a frequency offset. In other words, the shifting formula of the fifth sequence may change as the frequency offset changes, that is, the shifting formula of the fifth sequence may be a function of the frequency offset value. As an example only, the fifth sequence shift formula can be expressed as y ₁ (n)=x ₁ (n+N _FDM +1600), where _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. Optionally, the shift formula of the fifth sequence can be expressed as Δf _FDM is the actual frequency offset degree of the determined frequency domain resources. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. C represents the interval between different frequency domain resources used for sending downlink common signals. For example, if the interval between different frequency domain resources is 20RB, then C is 20RB. In some embodiments, intervals between different frequency domain resources may be different, and C may be a different value, for example, 10RB, 20RB, 30RB and so on.

At block 6035, the core network device processes the cyclically shifted fourth M sequence and the cyclically shifted fifth M sequence to generate a DMRS sequence for the PBCH. In some embodiments, the core network device adds the cyclically shifted fourth M sequence and the cyclically shifted fifth M sequence, and then performs symbol conversion to generate a DMRS sequence for the PBCH. In other embodiments, the core network device processes the cyclically shifted fourth M sequence and the cyclically shifted fifth M sequence to generate an intermediate sequence (hereinafter referred to as "the first sequence"). In this case, the core network device cyclically shifts the first sequence based on a sequence shift formula including a frequency offset, and then performs symbol conversion to generate a DMRS sequence for PBCH. As an example only, the sequence shift formula can be expressed as c(n)=c(n+N _FDM ). Optionally, the sequence shift formula can be expressed as In this way, the generation of the sequence of the DMRS is associated with a frequency offset, thereby avoiding an excessively high peak-to-average power ratio.

As noted above, in some embodiments, a fourth sequence of shifting formulas may be associated with a frequency offset. As shown in FIG. 7C , the shift register 731 can be x ₀ (n+31)=[x ₀ (n+3)+x ₀ (n)]mod2. In some embodiments, the initial value of the shift register may be 0000000000000000000000000000001. The sequence x ₀ (n) output by the shift register 731 can be circularly shifted ( 732 ). In some embodiments, the shift formula can be expressed as y ₀ (n)=x ₀ (n+N _FDM +1600), cyclically shifting N _FDM +1600 bits. In other embodiments, the shift formula can be expressed as cyclic shift bit.

As mentioned above, in some embodiments, the initial value of the fourth M-sequence may be associated with a frequency offset. In some embodiments, the initial value of the shift register can be expressed as Optionally, the initial value can be expressed as The sequence x ₀ (n) output by the shift register 731 can be circularly shifted ( 732 ). shift formula It can be expressed as y ₀ (n)=x ₀ (n+1600), and the circular shift is 1600 bits.

As noted above, in some embodiments, a fifth sequence of shift formulas may be associated with a frequency offset. As shown in FIG. 7C, the shift register 733 can be x ₁ (n+31)=[x ₁ (n+3)+x ₁ (n+2)+x ₁ (n+1)+x ₁ (n) ] mod2. In some embodiments, the initial value of the shift register can be The sequence x ₁ (n) output by the shift register 733 can be circularly shifted (734). In some embodiments, the shift formula can be expressed as y ₁ (n)=x ₁ (n+N _FDM +1600), cyclically shifting N _FDM +1600 bits. In other embodiments, the shift formula can be expressed as cyclic shift bit.

As mentioned above, in some embodiments, the initial value of the fifth M-sequence may be associated with a frequency offset. In some embodiments, the initial value of the shift register can be expressed as Optionally, the initial value can be expressed as The sequence x1(n) output by the shift register 733 can be circularly shifted (734). The shift formula can be expressed as y ₁ (n)=x ₁ (n+1600), and the circular shift is 1600 bits.

In some embodiments, as shown in FIG. 7C , the cyclically shifted sequence y ₀ (n) and the cyclically shifted sequence y ₁ (n) perform sequence addition and symbol conversion to generate a DMRS sequence. For example, the formula for sequence addition can be expressed as c(n)=[y ₀ (n)+y ₁ (n)]mod2, and the sign conversion formula is expressed as Where r _DMRSforPBCH is the generated DMRS sequence.

In other embodiments, after sequence addition of the cyclically shifted sequence y ₀ (n) and cyclically shifted sequence y ₁ (n), the core network device may perform sequence shifting, and then perform symbol conversion . As an example only, the sequence shift formula can be expressed as c(n)=c(n+N _FDM ). Optionally, the sequence shift formula can be expressed as

FIG. 6D shows a flowchart of a method 604 for generating scrambled PBCH information according to some embodiments of the present disclosure. The method 604 can be implemented at the core network device 320 as shown in FIG. 3 .

At block 6041, the core network device generates an eighth M-sequence from the eighth primitive polynomial. For example, the eighth primitive polynomial may be x ³¹ +x ³ +1, and the length of the eighth M sequence may be 127. In other embodiments, the initial value of the eighth M sequence may be a predefined value, which is not associated with a frequency offset. In some embodiments, the initial value of the eighth M-sequence may be associated with a frequency offset. For example, the initial value of the eighth M sequence can be changed as the frequency offset changes. In other words, the initial value of the fourth M sequence may be a function of the frequency offset value. In some embodiments, the initial value of the eighth M-sequence is determined based on the relative offset value of the frequency offset. As an example only, this initial value can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. understandable, can be any suitable function formula. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. For example, if the value of _NFDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. Optionally, the initial value of the eighth M sequence is determined based on an actual frequency offset of the frequency offset. For example, the initial value of the eighth M sequence can be expressed as Wherein Δf _FDM is the actual frequency offset degree of the determined frequency domain resource. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. For example, if the value of Δf _FDM is 0, it means that the determined frequency domain resource has no frequency offset relative to the reference position, that is, the determined frequency domain resource is located at the reference position. If the value of Δf _FDM is 20RB, it means that the determined offset of the frequency domain resource relative to the reference position is 20RB. In this way, it is realized that the initial value of the sequence is changed with the change of the frequency offset, so that the generated scrambled PBCH information is changed with the change of the frequency offset, and the nonlinear distortion caused by too high PARP is avoided.

At block 6042, the core network device cyclically shifts the eighth M sequence based on the eighth sequence shift formula. in a certain In some embodiments, the shift formula of the eighth sequence may be predefined, which is not associated with the frequency offset. In other embodiments, the eighth sequence shift formula may be associated with a frequency offset. In other words, the shifting formula of the eighth sequence may vary with the change of the frequency offset, that is, the shifting formula of the eighth sequence may be a function of the frequency offset value. As an example only, the eighth sequence shift formula can be expressed as y ₀ (n)=x ₀ (n+N _FDM +1600). _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. Optionally, the eighth sequence shift formula can be expressed as Δf _FDM is the actual frequency offset degree of the determined frequency domain resource. Δf _FDM can be any suitable value, for example, 0, 20RB, 40RB, 60RB. C represents the interval between different frequency domain resources used for sending downlink common signals. For example, if the interval between different frequency domain resources is 20RB, then C is 20RB. In some embodiments, intervals between different frequency domain resources may be different, and C may be a different value, for example, 10RB, 20RB, 30RB and so on.

At block 6043, the core network device generates a ninth M-sequence from the ninth primitive polynomial. For example, the ninth primitive polynomial may be x ³¹ +x ³ +x ² +x+1, and the length of the ninth M sequence may be 127. In other embodiments, the initial value of the ninth M sequence may be a predefined value, which is not associated with a frequency offset. In some embodiments, the initial value of the ninth M-sequence may be associated with a frequency offset. For example, the initial value of the ninth M sequence can be changed as the frequency offset changes. In other words, the initial value of the ninth M-sequence may be a function of the frequency offset value. In some embodiments, the initial value of the ninth M-sequence is determined based on the relative offset value of the frequency offset. As an example only, this initial value can be expressed as Wherein _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. _NFDM can be any suitable value, eg, 0, 1, 2, 3, etc. Optionally, the initial value of the ninth M sequence is determined based on the actual frequency offset of the frequency offset. For example, the initial value of the ninth M sequence can be expressed as Wherein Δf _FDM is the actual frequency offset degree of the determined frequency domain resource. In this way, it is realized that the initial value of the sequence is changed with the change of the frequency offset, so that the generated scrambled PBCH information is changed with the change of the frequency offset, and the nonlinear distortion caused by too high PARP is avoided.

At block 6044, the core network device cyclically shifts the ninth M sequence based on the ninth sequence shift formula. In some embodiments, the ninth sequence shift formula can be predefined, which is not associated with frequency offset. In other embodiments, the ninth sequence of shift formulas may be associated with a frequency offset. In other words, the shifting formula of the ninth sequence may vary with the frequency offset, that is, the shifting formula of the ninth sequence may be a function of the frequency offset value. As an example only, the shift formula of the ninth sequence may be expressed as y ₁ (n)=x ₁ (n+N _FDM +1600), where _NFDM is the frequency offset degree of the determined frequency domain resource relative to the reference position. Optionally, the ninth sequence shift formula can be expressed as C represents the interval between different frequency domain resources used for sending downlink common signals. For example, if the interval between different frequency domain resources is 20RB, then C is 20RB. In some embodiments, intervals between different frequency domain resources may be different, and C may be a different value, for example, 10RB, 20RB, 30RB and so on.

At block 6045, the core network device processes the cyclically shifted eighth M-sequence and the cyclically shifted ninth M-sequence to generate a second sequence. At block 6046, the core network device cyclically shifts the second sequence based on the tenth sequence shift formula. In some embodiments, the tenth sequence shift formula can be predefined, which is not associated with frequency offset. In other embodiments, the tenth sequence shift formula may be associated with a frequency offset. In other words, the shift formula of the tenth sequence may vary with the change of the frequency offset, that is, the shift formula of the tenth sequence may be a function of the frequency offset value. As an example only, the tenth sequence shift formula can be expressed as c(n)=c(n+vM _bit +N _FDM ), where v represents the lowest 2 bits of the index of the downlink common signal or the downlink common The lowest 3 bits of the signal index, _NFDM indicates a relative offset value of the frequency offset, and M _bit indicates the number of bits of data to be scrambled. Optionally, the shift formula of the tenth sequence can be expressed as Where v represents the lowest 2 bits of the index of the downlink common signal or the lowest 3 bits of the index of the downlink common signal, Δf _FDM represents the actual frequency offset of the frequency offset, and M _bit represents the data to be scrambled the number of bits. At block 6047, the core network device adds the second sequence to the data to be scrambled on the physical broadcast channel modulo 2 to generate scrambled physical broadcast channel data.

As noted above, in some embodiments, an eighth sequence shift formula may be associated with a frequency offset. As shown in FIG. 7D , the shift register 741 can be x ₀ (n+31)=[x ₀ (n+3)+x ₀ (n)]mod2. In some embodiments, the initial value of the shift register may be 0000000000000000000000000000001. The sequence x ₀ (n) output by the shift register 741 can be circularly shifted ( 742 ). In some embodiments, the shift formula can be expressed as y ₀ (n)=x ₀ (n+N _FDM +1600), cyclically shifting N _FDM +1600 bits. In other embodiments, the shift formula can be expressed as cyclic shift bit.

As noted above, in some embodiments, the initial value of the eighth M-sequence may be associated with a frequency offset. In some embodiments, the initial value of the shift register can be expressed as Optionally, the initial value can be expressed as The sequence x ₀ (n) output by the shift register 741 can be circularly shifted ( 742 ). The shift formula can be expressed as y ₀ (n)=x ₀ (n+1600), and the circular shift is 1600 bits.

As noted above, in some embodiments, a ninth sequence of shifting formulas may be associated with a frequency offset. As shown in FIG. 7D, the shift register 743 can be x ₁ (n+31)=[x ₁ (n+3)+x ₁ (n+2)+x ₁ (n+1)+x ₁ (n) ] mod2. In some embodiments, the initial value of the shift register can be The sequence x ₁ (n) output by the shift register 743 can be circularly shifted ( 744 ). In some embodiments, the ninth shift formula can be expressed as y ₁ (n)=x ₁ (n+N _FDM +1600), cyclically shifting N _FDM +1600 bits. In other embodiments, the ninth shift formula can be expressed as cyclic shift bit.

As noted above, in some embodiments, the initial value of the ninth M-sequence may be associated with a frequency offset. In some embodiments, the initial value of the shift register can be expressed as Optionally, the initial value can be expressed as The sequence x ₁ (n) output by the shift register 743 can be circularly shifted ( 744 ). The shift formula can be expressed as y ₁ (0)=x ₁ (n+1600), and the circular shift is 1600 bits.

As shown in FIG. 7D , the sequence addition of the cyclically shifted sequence y ₀ (n) and the cyclically shifted sequence y ₁ (n) is performed to obtain the second sequence c(n). For example, the formula for sequence addition can be expressed as c(n)=[y ₀ (n)+y ₁ (n)] mod2. The second sequence c(n) undergoes a shift cycle (745) based on the tenth sequence shift formula. In some embodiments, the tenth sequence shift formula may be associated with a frequency offset. In some embodiments, the tenth shift formula can be expressed as c(n)=c(n+vM _bit + _NFDM ), cyclically shifting _NFDM bits. In other embodiments, the shift formula can be expressed as cyclic shift bit. The core network device performs symbol conversion on the cyclically shifted second sequence. For example, the symbol conversion formula can be expressed as b _PBCH (n)=[b(n)+c(n)]mod2, where b(n) is PBCH data to be scrambled.

FIG. 8 shows a schematic diagram of the flow of an exemplary communication method 800 . Method 800 is implemented at an access network device, eg, access network device 120 .

At block 810, the core network device determines frequency domain resources for sending downlink common signals. The core network device generates one or more items of the PSS sequence, the SSS sequence, the scrambled PBCH information, and the DMRS sequence for the PBCH based on the determined frequency domain information of the frequency domain resource. It has been described with reference to FIG. 5 and FIG. 6A-FIG. 7D that the core network device determines frequency domain resources for sending downlink common signals and the core network device generates a sequence set of downlink common signals based on frequency information, so details are not repeated here.

At block 820, the core network device transmits a downlink common signal on the determined frequency domain resource. For example, a core network device may send downlink public signals to multiple terminal devices it serves. In other words, the core network equipment can broadcast the downlink common signal. It has been described with reference to FIG. 5 that the core network device sends the downlink common signal, and details are not repeated here.

FIG. 9 shows a schematic diagram of the flow of an exemplary communication method 900 . The method 900 is implemented at a terminal device, for example, the terminal device 110-1.

At block 910, the terminal device receives downlink data. The reception of downlink data by the terminal device has been described with reference to FIG. 5 , which will not be repeated here.

At block 920, the terminal device determines the sequence set of the downlink common signal at the frequency domain location based on the frequency domain information of the frequency domain resource where the downlink data is located. It has been described with reference to FIG. 5 that the terminal device determines the sequence set of the downlink common signal, and details are not repeated here.

10A to 10B show schematic block diagrams of communication devices according to some embodiments of the present disclosure. The communication means may be implemented as a device or a chip in a device, and the scope of the present disclosure is not limited in this respect.

As shown in FIG. 10A , the device 1001 includes a determining unit 1010 and a sending unit 1020 . The determining unit 1010 is configured to determine frequency domain resources for sending downlink common signals. The downlink common signal includes at least one of the following: a primary synchronization signal, a secondary synchronization signal, information of a physical broadcast channel, and a demodulation reference signal for the physical broadcast channel. At least one of the following is generated based on the frequency domain information of the frequency domain resources: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the demodulation of the physical broadcast channel Sequence of reference signals. The sending unit 102 is configured to receive a paging message corresponding to a terminal device from a core network device. The sending unit 1101 is further configured to send the generated downlink common signal on frequency domain resources. It can be understood that the device 1000 may further include other units for implementing the method shown in FIG. 5 .

As shown in FIG. 10B , the device 1000 includes a receiving unit 1011 and a determining unit 1021 . The receiving unit 1011 is configured to receive downlink data from a network device. The determining unit 1021 is configured to determine the sequence set of the downlink common signal at the frequency domain position based on the frequency domain information of the frequency domain resource where the downlink data is located. At least one of the following is generated based on the frequency domain information of frequency domain resources: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the demodulation reference signal for the physical broadcast channel the sequence of. It can be understood that the device 1002 may further include other units for implementing the method shown in FIG. 5 .

FIG. 11 is a simplified block diagram of an example device 1100 suitable for implementing embodiments of the present disclosure. The device 1100 may be used to implement a terminal device, an access network device, or a core network device as shown in FIG. 1 . As shown, device 1100 includes one or more processors 1110 , one or more memories 1120 coupled to processors 1110 , and communication module 1140 coupled to processors 1110 .

The communication module 1140 can be used for two-way communication. The communication module 1140 may have at least one communication interface for communication. Communication interfaces may include any interface necessary to communicate with other devices.

The processor 1110 can be any type suitable for the local technology network, and can include but not limited to at least one of the following: a general purpose computer, a special purpose computer, a microcontroller, a digital signal processor (Digital Signal Processor, DSP), or a control based One or more of the multi-core controller architectures of the processor. Device 1100 may have multiple processors, such as application specific integrated circuit chips, that are time slaved to a clock that is synchronized to a main processor.

Memory 1120 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memory include but are not limited to at least one of the following: read-only memory (Read-Only Memory, ROM) 1124, erasable programmable read-only memory (Erasable Programmable Read Only Memory, EPROM), flash memory, hard disk , Compact Disc (CD), Digital Video Disk (Digital Versatile Disc, DVD) or other magnetic and/or optical storage. Examples of volatile memory include, but are not limited to, at least one of: Random Access Memory (RAM) 1122, or other volatile memory that does not persist for the duration of a power outage.

The computer program 1130 comprises computer-executable instructions executed by the associated processor 1110 . The program 1130 may be stored in the ROM 1120 . Processor 1110 can execute any suitable action and processing.

Embodiments of the present disclosure may be implemented by means of a program 1130 such that the device 1100 may perform any process as discussed with reference to FIGS. 5 to 9 . Embodiments of the present disclosure can also be realized by hardware or by a combination of software and hardware.

In some embodiments, program 1130 may be tangibly embodied on a computer-readable medium, which may be included in device 1100 (such as in memory 1120 ) or other storage device accessible by device 1100 . Program 1130 may be loaded from a computer readable medium into RAM 1222 for execution. The computer readable medium may include any type of tangible nonvolatile memory such as ROM, EPROM, flash memory, hard disk, CD, DVD, and the like.

In general, the various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor or other computing device. While various aspects of the embodiments of the present disclosure are shown and described as block diagrams, flowcharts, or using some other pictorial representation, it should be understood that the blocks, devices, systems, techniques or methods described herein can be implemented as, without limitation, Exemplary, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controllers or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product comprises computer-executable instructions, eg included in program modules, which are executed in a device on a real or virtual processor of a target to perform the process/method as above with reference to FIGS. 5-9 . Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or divided as desired among the program modules. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote storage media.

Computer program codes for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program codes can be provided to processors of general-purpose computers, special-purpose computers, or other programmable data processing devices, so that when the program codes are executed by the computer or other programmable data processing devices, The functions/operations specified in are implemented. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.

In the context of the present disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform the various processes and operations described above. Examples of carriers include signals, computer readable media, and the like. Examples of signals may include electrical, optical, radio, sound, or other forms of propagated signals, such as carrier waves, infrared signals, and the like.

A computer readable medium may be any tangible medium that contains or stores a program for or related to an instruction execution system, apparatus, or device. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of computer-readable storage media include electrical connections with one or more wires, portable computer diskettes, hard disks, random storage access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash), optical storage, magnetic storage, or any suitable combination thereof.

In addition, while operations of methods of the present disclosure are depicted in a particular order in the figures, this does not require or imply that operations must be performed in that particular order, or that all illustrated operations must be performed, to achieve desirable results. Conversely, the steps depicted in the flowcharts may be performed in an altered order. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution. It should also be noted that the features and functions of two or more devices according to the present disclosure may be embodied in one device. Conversely, a device described above with Features and functions can be further divided to be embodied by multiple means.

Claims

A communication method, characterized in that the method comprises:

The access network device determines frequency domain resources for sending downlink public signals, where the downlink public signals include at least one of the following: a primary synchronization signal, a secondary synchronization signal, information about a physical broadcast channel, and information about the physical broadcast channel demodulation reference signal,

Wherein at least one of the following items is generated based on the frequency domain information of the frequency domain resource: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the information used for the a sequence of said demodulation reference signals of said physical broadcast channel; and

The access network device sends the generated downlink common signal on the frequency domain resource.
The communication method according to claim 1, wherein the sequence in which the access network device generates the downlink public signal comprises:

generating a first M sequence from a first primitive polynomial;

Perform cyclic shift on the generated first M sequence based on the first sequence shift formula; and

processing the cyclically shifted first M sequence to generate a sequence of the primary synchronization signal,

Wherein at least one of the first sequence shift formula or the initial value of the first M sequence is associated with a frequency offset, where the frequency offset is the relative reference position of the frequency domain resources in the frequency domain offset.
The communication method according to claim 2, wherein the shift formula of the first sequence is y(n)=x(n+m), NFDM is the relative offset value of the frequency offset; or

Wherein, the shift formula of the first sequence is y(n)=x(n+m), Δf FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used to send the downlink common signal.
The communication method according to claim 2, wherein the initial value of the first M sequence is determined based on a relative offset value of the frequency offset; or

The initial value of the first M sequence is determined based on the actual frequency offset of the frequency offset.
The communication method according to any one of claims 1-4, wherein the sequence of generating the downlink public signal by the access network device comprises:

generating a second M sequence from a second primitive polynomial;

Perform cyclic shift on the generated second M sequence based on the second sequence shift formula;

generating a third M sequence from a third primitive polynomial;

Perform cyclic shift on the generated third M sequence based on a third sequence shift formula; and

processing the cyclically shifted second M sequence and the cyclically shifted third M sequence to generate the secondary synchronization signal sequence,

Wherein at least one of the second sequence shift formula, the third sequence shift formula, the initial value of the second M sequence, or the initial value of the third M sequence is associated with a frequency offset , the frequency offset is an offset of the frequency domain resource relative to a reference position in the frequency domain.
The communication method according to claim 5, wherein the shift formula of the second sequence is y 0 (n)=x 0 (n+m 0 ), NFDM is the relative offset value of the frequency offset; or

Wherein the second sequence shift formula is y 0 (n)=x 0 (n+m 0 ), Δf FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used to send the downlink common signal.
The communication method according to claim 5, characterized in that,

The third sequence shift formula is y 1 (n)=x 1 (n+m 1 ), NFDM is the relative offset value of the frequency offset; or

The third sequence shift formula is y 1 (n)=x 1 (n+m 1 ), Δf FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used to send the downlink common signal.
The communication method according to claim 5, wherein the initial value of at least one of the second M sequence and the third M sequence is determined based on a relative offset value of the frequency offset ;or

Wherein the initial value of at least one of the second M sequence and the third M sequence is determined based on the actual frequency offset of the frequency offset.
The communication method according to any one of claims 1-8, wherein the sequence of generating the downlink public signal by the access network device comprises:

generating a fourth M sequence from a fourth primitive polynomial;

Perform cyclic shift on the generated fourth M sequence based on the fourth sequence shift formula;

generating a fifth M sequence from a fifth primitive polynomial;

Perform cyclic shift on the generated fifth M sequence based on the fifth sequence shift formula; and

processing the cyclically shifted fourth M sequence and the cyclically shifted fifth M sequence to generate a sequence of demodulation reference signals of the physical broadcast channel,

Wherein at least one of the fourth sequence shift formula, the fifth sequence shift formula, the initial value of the fourth M sequence, or the initial value of the fifth M sequence is associated with a frequency offset , the frequency offset is an offset of the frequency domain resource relative to a reference position in the frequency domain.
The communication method according to claim 9, wherein at least one of the fourth sequence shift formula and the fifth sequence shift formula is y(n)=x(n+N FDM +1600) , where NFDM is the relative offset value of the frequency offset; or

At least one of the fourth sequence shift formula and the fifth sequence shift formula is Where Δf FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used to send the downlink common signal.
The communication method according to claim 9, characterized in that,

The initial value of the fourth M sequence is determined based on a relative offset value of the frequency offset; or

The initial value of the fourth M sequence is determined based on the actual frequency offset of the frequency offset.
The communication method according to claim 9, characterized in that,

The initial value of the fifth M-sequence is determined based on a relative offset value of the frequency offset; or

The initial value of the fifth M sequence is determined based on the actual frequency offset of the frequency offset.
The communication method according to any one of claims 1-8, wherein the sequence of generating the downlink public signal by the access network device comprises:

generating a sixth M sequence from a sixth primitive polynomial;

Perform cyclic shift on the generated sixth M sequence based on the sixth sequence shift formula;

generating a seventh M sequence from a seventh primitive polynomial;

Perform cyclic shift on the generated seventh M sequence based on the seventh sequence shift formula;

converting the cyclically shifted sixth M sequence and the cyclically shifted seventh M sequence to generate a first sequence; and

Based on an eighth sequence shift formula including a frequency offset, cyclically shift the first sequence to generate a sequence of demodulation reference signals of the physical broadcast channel, where the frequency offset is the frequency domain resource The offset from the reference position in the frequency domain.
The communication method according to claim 13, wherein the shift formula of the eighth sequence is c(n)=c(n+N FDM ), wherein NFDM is the relative offset value of the frequency offset; or

The shift formula of the eighth sequence is Where Δf FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used to send the downlink common signal.
The communication method according to any one of claims 1-14, wherein the sequence of generating the downlink public signal by the access network device comprises:

generating an eighth M sequence from an eighth primitive polynomial;

Perform cyclic shift on the generated eighth M sequence based on the shift formula of the eighth sequence;

generating a ninth M sequence from a ninth primitive polynomial;

Perform cyclic shift on the generated ninth M sequence based on the ninth sequence shift formula;

adding the cyclically shifted eighth M sequence and the cyclically shifted ninth M sequence to generate a second sequence;

Perform cyclic shift on the generated second sequence based on the tenth sequence shift formula; and

adding the second sequence to the physical broadcast channel data to be scrambled modulo 2 to generate scrambled physical broadcast channel data,

Wherein, at least one of the shift formula of the eighth sequence, the shift formula of the ninth sequence, the shift formula of the tenth sequence, the initial value of the eighth M sequence, or the initial value of the ninth M sequence One item is associated with a frequency offset, where the frequency offset is an offset of the frequency domain resource relative to a reference position in the frequency domain.
The communication method according to claim 15, wherein at least one of the eighth sequence shift formula and the ninth sequence shift formula is y(n)=x(n+N FDM +1600) , where NFDM is the relative offset value of the frequency offset; or

At least one of the eighth sequence shift formula and the ninth sequence shift formula is Where Δf FDM is the actual frequency offset of the frequency offset, and C is the interval between different frequency domain resources used to send the downlink common signal.
The communication method according to claim 15, wherein the shift formula of the tenth sequence is c(n)=c(n+vM bit +N FDM ), where v represents the index of the downlink common signal The lowest 2 bits or the lowest 3 bits of the index of the downlink common signal, NFDM indicates a relative offset value of the frequency offset, and M bit indicates the number of bits of data to be scrambled; or

Wherein the shift formula of the tenth sequence is Where v represents the lowest 2 bits of the index of the downlink common signal or the lowest 3 bits of the index of the downlink common signal, Δf FDM represents the actual frequency offset of the frequency offset, and M bit represents the bit of the data to be scrambled number.
The communication method according to claim 15, wherein the initial value of the eighth M sequence is determined based on a relative offset value of the frequency offset; or

The initial value of the eighth M sequence is determined based on the actual frequency offset of the frequency offset.
The communication method according to claim 15, wherein the initial value of the ninth M sequence is determined based on a relative offset value of the frequency offset; or

The initial value of the ninth M sequence is determined based on the actual frequency offset of the frequency offset.
A communication method, characterized in that the method comprises:

The terminal device receives downlink data from the access network device; and

The terminal device determines the sequence set of the downlink common signal at the frequency domain position based on the frequency domain information of the frequency domain resource where the downlink data is located, wherein at least one of the following items is generated based on the frequency domain information of the frequency domain resource of: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the scrambled information of the physical broadcast channel, and the sequence of the demodulation reference signal used for the physical broadcast channel.
The method according to claim 20 or 21, wherein the frequency domain information of the frequency domain resource is an offset of the frequency domain resource relative to a reference position in the frequency domain.
An access network device, comprising:

A processor configured to determine frequency domain resources for sending downlink common signals, where the downlink common signals include at least one of the following: a primary synchronization signal, a secondary synchronization signal, information on a physical broadcast channel, and information used for the physical broadcast The demodulation reference signal of the channel, wherein at least one of the following is generated based on the frequency domain information of the frequency domain resource: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, and the scrambled physical broadcast channel and the sequence of the demodulation reference signal for the physical broadcast channel; and

A transceiver configured to send the generated downlink common signal on the frequency domain resource.
The access network device according to claim 22, wherein the processor is further configured to:

generating a first M sequence from a first primitive polynomial;

Perform cyclic shift on the generated first M sequence based on the first sequence shift formula; and

processing the cyclically shifted first M sequence to generate a sequence of the primary synchronization signal,

Wherein at least one of the first sequence shift formula or the initial value of the first M sequence is associated with a frequency offset, wherein the frequency offset is the relative reference position of the frequency domain resources in the frequency domain offset.
The access network device according to claim 22 or 23, wherein the processor is further configured to: generate a second M-sequence from a second primitive polynomial;

Perform cyclic shift on the generated second M sequence based on the second sequence shift formula;

generating a third M sequence from a third primitive polynomial;

Perform cyclic shift on the generated third M sequence based on a third sequence shift formula; and

processing the cyclically shifted second M sequence and the cyclically shifted third M sequence to generate the secondary synchronization signal sequence,

Wherein at least one of the second sequence shift formula, the third sequence shift formula, the initial value of the second M sequence, or the initial value of the third M sequence is associated with a frequency offset , the frequency offset is an offset of the frequency domain resource relative to a reference position in the frequency domain.
The access network device according to any one of claims 22-24, wherein the processor is further configured to:

generating a fourth M sequence from a fourth primitive polynomial;

Perform cyclic shift on the generated fourth M sequence based on the fourth sequence shift formula;

generating a fifth M sequence from a fifth primitive polynomial;

Perform cyclic shift on the generated fifth M sequence based on the fifth sequence shift formula; and

processing the cyclically shifted fourth M sequence and the cyclically shifted fifth M sequence to generate the a sequence of demodulation reference signals for the physical broadcast channel,

Wherein at least one of the fourth sequence shift formula, the fifth sequence shift formula, the initial value of the fourth M sequence, or the initial value of the fifth M sequence is associated with a frequency offset , the frequency offset is an offset of the frequency domain resource relative to a reference position in the frequency domain.
The access network device according to any one of claims 22-25, wherein the processor is further configured to:

generating a sixth M sequence from a sixth primitive polynomial;

Perform cyclic shift on the generated sixth M sequence based on the sixth sequence shift formula;

generating a seventh M sequence from a seventh primitive polynomial;

Perform cyclic shift on the generated seventh M sequence based on the seventh sequence shift formula;

converting the cyclically shifted sixth M sequence and the cyclically shifted seventh M sequence to generate a first sequence; and

Based on an eighth sequence shift formula including a frequency offset, cyclically shift the first sequence to generate a sequence of demodulation reference signals of the physical broadcast channel, where the frequency offset is the frequency domain resource The offset from the reference position in the frequency domain.
The access network device according to any one of claims 22-25, wherein the processor is further configured to:

generating an eighth M sequence from an eighth primitive polynomial;

Perform cyclic shift on the generated eighth M sequence based on the shift formula of the eighth sequence;

generating a ninth M sequence from a ninth primitive polynomial;

Perform cyclic shift on the generated ninth M sequence based on the ninth sequence shift formula;

adding the cyclically shifted eighth M sequence and the cyclically shifted ninth M sequence to generate a second sequence;

Perform cyclic shift on the generated second sequence based on the tenth sequence shift formula; and

adding the second sequence to the physical broadcast channel data to be scrambled modulo 2 to generate scrambled physical broadcast channel data,

Wherein, at least one of the shift formula of the eighth sequence, the shift formula of the ninth sequence, the shift formula of the tenth sequence, the initial value of the eighth M sequence, or the initial value of the ninth M sequence One item is associated with a frequency offset, where the frequency offset is an offset of the frequency domain resource relative to a reference position in the frequency domain.
A terminal device comprising:

a transceiver configured to receive downlink data from the access network device; and

A processor configured to determine the sequence set of the downlink common signal at the frequency domain location based on the frequency domain information of the frequency domain resource where the downlink data is located, wherein at least one of the following is based on the frequency domain of the frequency domain resource Information generated: the sequence of the primary synchronization signal, the sequence of the secondary synchronization signal, the information of the scrambled physical broadcast channel, and the sequence of the demodulation reference signal used for the physical broadcast channel.
A chip, the chip includes a processor and a memory, the processor is coupled to the memory, and is used to execute computer programs or instructions stored in the memory, so that the chip implements any A method according to one or a method according to any one of claims 20 to 21.
A computer-readable storage medium, the computer-readable storage medium has instructions stored thereon, and when the instructions are executed by a processor of the device, the device implements the device according to any one of claims 1 to 19. or a method according to any one of claims 20 to 21.
A computer program product tangibly stored on a computer-readable medium and comprising computer-executable instructions which, when executed, cause an apparatus to implement a device according to any one of claims 1 to 19. A method according to claim 2 or a method according to any one of claims 20 to 21.