Methods, devices, and systems for wireless transmission with limited channel bandwidth.

Abstract

The present disclosure describes a method, a system, and a device for wireless communication with a limited channel bandwidth. One method includes determining a transmission bandwidth by a user equipment (UE) receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), the transmission bandwidth being among a plurality of transmission bandwidths below the channel bandwidth, the channel bandwidth being smaller than a bandwidth threshold. In some other embodiments, an apparatus for wireless communication may include a memory storing instructions and a processing circuit in communication with the memory. When the processing circuit executes the instructions, the processing circuit is configured to perform the above method.

Description

[Technical Field]

[0001] This disclosure relates in general to wireless communication; in particular to methods, devices, and systems for wireless communication with limited channel bandwidth. [Background technology]

[0002] background Wireless communication technology is driving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communication relies on efficient network resource management and allocation between user equipment and wireless access network nodes (including, but not limited to, base stations). Next-generation networks are expected to deliver high-speed, low-latency, and ultra-high-reliability communication capabilities, meeting the requirements of various industries and users.

[0003] With the rapid evolution of cellular mobile communication systems, more and more cells will operate at higher frequencies. In fifth-generation mobile communication technology, the minimum supported bandwidth can be 5 MHz with a 15 kHz subcarrier spacing (SCS) under normal circumstances. In some special scenarios, railways (e.g., future rail mobile communication systems (FRMCS)) may have 2.8–3.6 MHz of available frequency domain resources, smart grids and / or public safety and / or public protection and disaster relief (PPDR) may have approximately 3 MHz of available frequency resources, and some operators may have less than 5 MHz of available frequency domain resources. When the bandwidth is less than 5 MHz, the available frequency domain resources may differ. In different service scenarios, the UE needs to know what the actual available transmission bandwidth is. For example, if the defined minimum bandwidth is less than 3.6 MHz, the original synchronization signal (SS) or physical broadcast channel (PBCH) block may exceed the minimum bandwidth, and one or more resource blocks (RB) of the SS / PBCH block exceeding the minimum bandwidth may become punctured, resulting in performance degradation. An SSB block may include a primary synchronization signal (PSS) block and / or a secondary synchronization signal (SSS) block. In another example, limited bandwidth (e.g., less than 3.6 MHz) may reduce the aggregation level supported by the control resource set (CORESET), resulting in insufficient effective communication range for the physical downlink control channel (PDCCH).

[0004] This disclosure describes various embodiments for limited-channel-bandwidth wireless communication that address at least one of the aforementioned problems / challenges, minimize degradation of PBCH reception, minimize degradation due to insufficient PDCCH coverage, and thus improve the performance of wireless communication. [Overview of the project] [Means for solving the problem]

[0005] overview This disclosure relates to methods, systems, and devices for wireless communication, and more specifically, to methods, systems, and devices for wireless communication with limited channel bandwidth.

[0006] In one embodiment, the disclosure describes a method for wireless communication. The method includes determining a transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB) from a user device (UE), wherein the transmission bandwidth is among several transmission bandwidths below the channel bandwidth, and the channel bandwidth is less than a bandwidth threshold.

[0007] In some other embodiments, the device for wireless communication may include a memory for storing instructions and a processing circuit communicating with the memory. When the processing circuit executes an instruction, the processing circuit is configured to perform the method described above.

[0008] In some other embodiments, a device for wireless communication may include a memory for storing instructions and a processing circuit communicating with the memory. When the processing circuit executes an instruction, the processing circuit is configured to perform the method described above.

[0009] In some other embodiments, the computer-readable medium includes instructions that cause the computer to perform the above-described method when executed by the computer.

[0010] The above and other embodiments, as well as their implementations, are described in more detail in the figures, descriptions, and claims. The present invention provides, for example, the following: (Item 1) A method for wireless communication, wherein the method is The user equipment (UE) determines the transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB). Includes, The aforementioned transmission bandwidth lies among multiple transmission bandwidths below the channel bandwidth. The channel bandwidth is smaller than the bandwidth threshold. (Item 2) The aforementioned bandwidth threshold is 5 MHz. The aforementioned SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS). The method described in item 1. (Item 3) The UE determines the transmission bandwidth based on the reception of SSB in different operating bands. The aforementioned different operating bandwidths correspond to a specific domain or purpose. The method described in items 1 and 2. (Item 4) The UE derives the global synchronization channel number (GSCN) from the frequency position of the SSB, The UE determines the transmission bandwidth based on the GSCN. The method described in either item 1 or 2. (Item 5) The aforementioned UE is, Deriving parameters from the GSCN according to the formula and using those parameters to determine the transmission bandwidth, or The method involves obtaining the remainder by the GSCN mod m and using the remainder to determine the transmission bandwidth, where mod is a modulo operation and m is an integer greater than or equal to the number of transmission bandwidths under the same channel bandwidth. The method according to item 4, wherein the transmission bandwidth is determined based on the GSCN by at least one of the following. (Item 6) The aforementioned UE is, The remainder is obtained by (f / rf) mod m, where f is the frequency position of the SSB, rf is the raster frequency, and m is an integer greater than or equal to the number of transmission bandwidths under the same channel bandwidth. The transmission bandwidth is determined using the aforementioned remainder. The method according to any one of items 1 to 2, wherein the transmission bandwidth is determined based on the frequency position of the SSB. (Item 7) The method according to item 6, wherein the raster frequency corresponds to a fixed synchronous raster frequency of N*100kHz, where N is a positive integer. (Item 8) The aforementioned UE is, Based on the sequence of the PSS, a cyclic shift is obtained for the basic sequence corresponding to the sequence of the PSS, The index for the transmission bandwidth is derived according to the cyclic shift for the basic sequence, Based on the aforementioned index, the transmission bandwidth is determined under the same channel bandwidth. The method according to any one of items 1 to 2, wherein the transmission bandwidth is determined based on the sequence of PSSs within the SSB. (Item 9) The method according to item 8, wherein the PSS sequence is one of three different PSS sequences, each exhibiting a different transmission bandwidth. (Item 10) The aforementioned UE is, Based on the sequence of the SSS, a cyclic shift is obtained for the basic sequence corresponding to the sequence of the SSS, The index for the transmission bandwidth is derived according to the cyclic shift for the basic sequence, Based on the aforementioned index, the transmission bandwidth is determined under the channel bandwidth. The method according to any one of items 1 to 2, wherein the transmission bandwidth is determined based on the sequence of SSSs within the SSB. (Item 11) The sequence of the aforementioned SSS is one of 336 different SSS sequences. The aforementioned 336 different SSS sequences are classified into Q groups, where Q is an integer greater than or equal to the number of transmission bandwidths under the same channel bandwidth. The derived index corresponds to one group among the Q groups, and the sequence of the SSS belongs to the group. The method described in item 10. (Item 12) The aforementioned UE is, Based on the sequence of the SSS, an interleaved sequence corresponding to the sequence of the SSS is obtained, To derive an index for the transmission bandwidth according to the interleaving sequence, Based on the aforementioned index, the transmission bandwidth is determined under the channel bandwidth. The method according to any one of items 1 to 2, wherein the transmission bandwidth is determined based on the sequence of SSSs within the SSB. (Item 13) The sequence of the SSS is one of two different interleaved SSS sequences. The two different interleaved sequences are obtained by interleaving two basic sequences in different interleaved orders. The method described in item 12. (Item 14) The aforementioned UE is, Based on the sequence of the PBCH DMRS, parameters are obtained for initializing the scrambling sequence generator corresponding to the sequence of the PBCH DMRS. Based on the aforementioned parameters, an index for the transmission bandwidth is derived, Based on the aforementioned index, the transmission bandwidth is determined under the channel bandwidth. The method according to any one of items 1 to 2, wherein the transmission bandwidth is determined based on the sequence of PBCH DMRS in the SSB. (Item 15) The aforementioned index has one bit representing two transmission bandwidths under the same channel bandwidth, The parameter has three bits, including one bit for half-frame timing, one bit for the index, and the least significant bit (LSB) of the SSB index. The most significant bit (MSB) of the aforementioned SSB index is obtained from a set of bits in the PBCH payload, ssb-SubcarrierOffset, or subCarrierSpacingCommon within the Master Information Block (MIB). The method described in item 14. (Item 16) The aforementioned index has 2 bits representing four transmission bandwidths under the same channel bandwidth, The parameter has 3 bits, including 1 bit for half-frame timing and 2 bits for the index. The two bits of the aforementioned SSB index are obtained from the set of bits in the PBCH payload, ssb-SubcarrierOffset, or subCarrierSpacingCommon within the MIB. The method described in item 14. (Item 17) The aforementioned index has one bit representing two transmission bandwidths under the same channel bandwidth, The parameter has 3 bits, including 1 bit of the index and 2 bits of the SSB index. One bit of half-frame timing is indicated by the fifth bit in the PBCH payload. The method described in item 14. (Item 18) The aforementioned index has 2 bits representing four transmission bandwidths under the same channel bandwidth, The parameter has 3 bits, including the 2 bits of the index and the LSB of the SSB index. One bit of half-frame timing is indicated by the fifth bit in the PBCH payload. The most significant bit (MSB) of the aforementioned SSB index is obtained from the set of bits in the PBCH payload. The method described in item 14. (Item 19) The set of bits in the PBCH payload includes three bits, including the sixth bit, the seventh bit, and the eighth bit in the PBCH payload, as described in any of items 15 to 18. (Item 20) A wireless communication device comprising a processor and memory, wherein the processor is configured to read a code from the memory and perform the method described in any of items 1 to 19. (Item 21) A computer program product having computer-readable program media code stored therein, wherein the computer-readable program media code causes the processor to perform any of the methods described in items 1 to 19 when executed by the processor. [Brief explanation of the drawing]

[0011] [Figure 1A] This shows an example of a wireless communication system that includes one wireless network node and one or more user devices.

[0012] [Figure 1B] A schematic diagram of a typical embodiment for wireless communication is shown.

[0013] [Figure 1C] A schematic diagram of another typical embodiment for wireless communication is shown.

[0014] [Figure 2] An example of a network node is shown.

[0015] [Figure 3] An example of user equipment is shown.

[0016] [Figure 4] A schematic diagram of a typical embodiment for wireless communication is shown.

[0017] [Figure 5] A flowchart of the method for wireless communication is shown.

[0018] [Figure 6A] A schematic diagram of a typical embodiment for wireless communication is shown.

[0019] [Figure 6B]Another schematic diagram of a typical embodiment for wireless communication is shown.

[0020] [Figure 7] An example of another typical embodiment for wireless communication is shown. [Modes for carrying out the invention]

[0021] Detailed explanation This disclosure is described below in detail with reference to the accompanying drawings, which constitute part of this disclosure and illustrate specific examples of embodiments. However, it should be noted that this disclosure may be embodied in various different forms, and therefore the subject matter covered or claimed is not limited to any of the embodiments described below.

[0022] Throughout this specification and the claims, terms may have nuances implied or suggested in context beyond their expressly stated meanings. Similarly, the phrases “in one embodiment” or “in several embodiments” used herein do not necessarily refer to the same embodiment, and the phrases “in another embodiment” or “in other embodiments” used herein do not necessarily refer to different embodiments. The phrases “in one implementation” or “in several implementations” used herein do not necessarily refer to the same implementation, and the phrases “in another implementation” or “in other implementations” used herein do not necessarily refer to different implementations. For example, the claimed subject matter is intended to include embodiments or combinations of implementations that are illustrated in whole or in part.

[0023] In general, terms can be understood at least partially from their use in context. For example, terms such as “and,” “or,” or “and / or” as used herein may have various meanings that may depend at least partially on the context in which such terms are used. When “or” is typically used to relate a list such as A, B, or C, it is intended to mean A, B, and C, used here in an inclusive sense, as well as A, B, or C, used here in an exclusive sense. Furthermore, the terms “one or more” or “at least one” as used herein may be used at least partially on context to describe any feature, structure, or characteristic in a singular sense, or to describe a combination of features, structures, or characteristics in a plural sense. Similarly, terms such as “a,” “an,” or “the” may be understood, at least partially on context, to convey singular use or plural use. Furthermore, the terms “based on” or “determined by” may be understood not necessarily to convey an exclusive set of factors, but rather, depending at least partially on the context, may allow for the presence of additional factors that are not necessarily explicitly stated.

[0024] This disclosure describes methods and devices for wireless communication with limited channel bandwidth.

[0025] Next-generation (NG) mobile communication systems are driving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communication relies on efficient network resource management and allocation between user equipment and wireless access network nodes (including, but not limited to, wireless base stations). Next-generation networks are expected to deliver high-speed, low-latency, and ultra-high-reliability communication capabilities, meeting the requirements of various industries and users.

[0026] With the rapid evolution of cellular mobile communication systems, more and more cells will operate at higher frequencies. For fifth-generation mobile communication technology, the minimum supported bandwidth can be 5 MHz under normal circumstances (e.g., when the subcarrier spacing (SCS) is 15 kHz). In some special scenarios, such as railways (e.g., future rail mobile communication systems (FRMCS)), smart grids, and / or public safety, the available frequency domain resources for some operators may be less than 5 MHz (e.g., 2.8-3.6 MHz or 3 MHz). When the bandwidth is less than 5 MHz, the available frequency domain resources may differ. In different service scenarios, the UE needs to know the actual available transmission bandwidth.

[0027] If the available frequency resources are below a bandwidth threshold (e.g., 5 MHz), various problems / challenges may arise. Some problems / challenges may include the fact that if the defined minimum bandwidth is less than 3.6 MHz, the original synchronization signal (SS) or physical broadcast channel (PBCH) block may exceed the minimum bandwidth, potentially causing one or more resource blocks (RBs) of the SS / PBCH block exceeding the minimum bandwidth to become punctured, resulting in performance degradation or inoperability. An SSB block may include primary synchronization signal (PSS) blocks and / or secondary synchronization signal (SSS) blocks. Another problem / challenge may include the fact that limited bandwidth (e.g., less than 3.6 MHz) can reduce the aggregation level supported by the control resource set (CORESET), potentially leading to insufficient physical downlink control channel (PDCCH) coverage. Yet another problem / challenge may include the fact that the available frequency domain resources may differ when the bandwidth is less than 5 MHz. In different service scenarios, the UE needs to know the actual available transmission bandwidth. For example, FRMCS may require a highly flexible L1 transmission bandwidth at bandwidth n100 to support the gradual transition from the Global System for Mobile Communications Railways (GSM-R) to FRMCS. Another issue / challenge may include signal performance loss on some channels due to the available bandwidth being less than 5 MHz.

[0028] This disclosure describes various embodiments for wireless communication with limited channel bandwidth. These various embodiments may have some advantages, such as providing a solution for identifying different transmission bandwidths, addressing at least one of the aforementioned problems / issues, minimizing degradation of PBCH reception, minimizing degradation due to insufficient PDCCH coverage, and thus improving the performance of wireless communication.

[0029] Figure 1A shows a wireless communication system 100 including a wireless network node 118 and one or more user devices (UEs) 110. The wireless network node may include a network base station, which may be a node B (NB, e.g., gNB) in a mobile telecommunications context. Each UE can wirelessly communicate with the wireless network node via one or more radio channels 115. For example, a first UE 110 can wirelessly communicate with the wireless network node 118 over a channel containing multiple radio channels for a certain period of time. The network base station 118 may transmit upper-layer signaling to the UEs 110. The upper-layer signaling may include configuration information for communication between the UEs and the base station. In one embodiment, the upper-layer signaling may include a radio resource control (RRC) message.

[0030] Figure 1B shows an example of the structure of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) (SS / PBCH) block (SSB). The SS / PBCH block occupies 20 resource blocks (RBs) and four consecutive time-domain symbols in the frequency domain. The first symbol (161) is mapped to the primary synchronization signal (PSS), the third symbol (163) is mapped to the secondary synchronization signal (SSS) and the physical broadcast channel (PBCH), and the second symbol (162) and fourth symbol (164) are mapped to the PBCH. Each RB (171) of the PBCH may contain three demodulated reference signal (DMRS) resource elements (REs) (173) for channel estimation. In some implementations, CORESET may occupy at least 24 RBs of frequency-domain resources.

[0031] In some implementations, an SS / PBCH block consists of 240 consecutive subcarriers (or resource elements (REs)) or 20 RBs in the frequency domain and 4 OFDM symbols in the time domain. A detailed resource mapping of signals (including PSS, SSS, and PBCH DMRS) and channels (PBCH) is shown in Figure 1B. More specifically, in the time domain, PSS and SSS occupy the first and third symbols, respectively, within the SS / PBCH block. PBCH is mapped to the second, third, and fourth symbols. In the frequency domain, PSS and SSS occupy RE48-RE191. For the second and fourth symbols, PBCH occupies all 240 REs or 20 PRBs in the SS / PBCH block, while for the third symbol, PBCH occupies RE0-RE47 (i.e., RB0-RB3) and RE192-RE239 (i.e., RB16-RB19). In each PBCH PRB, DMRS maps to 3 of the 12 REs. Then, 144 REs are mapped in the PBCH DMRS. Therefore, the sequence length of the PBCH DMRS is 144.

[0032] In some implementations, for a first frequency range (FR1) (e.g., sub-6 GHz frequencies), 3-bit timing information indicating, for example, the SSB index or the SSB index and half-frame indication is carried by the PBCH DMRS. Eight sequences corresponding to 3 bits may be defined for the PBCH DMRS per cell. The UE can first detect the PBCH DMRS sequence from the base station and then perform channel estimation for PBCH decoding. The UE can obtain the specific position of the SSB determined by the SSB index within the half-frame by performing correlation detection between the DMRS sequence received in SSB and the eight local DMRS sequences.

[0033] In some implementations, eight sequences are defined per cell in NR for the PBCH DMRS. That is, 3-bit information is carried by the PBCH DMRS. Therefore, the SSB index or SSB index and half-frame indicator can be shown by initializing the DMRS sequence as shown in the following equation, where C init This is the initial value, [ka] This is the cell identifier (ID) number.

[0034]

number

[0035] In some implementations, [ka] There are 1008 unique physical layer cell identification (PCI) values ​​given by, where, [ka] and [ka] In the case of NR, to represent 1008 PCIs, there are three different PSS signal sequences and 336 different SSS signal sequences for each PSS signal.

[0036] In some implementations, a physical downlink control channel (PDCCH) may be transmitted in a CORESET using one or more control channel elements (CCEs). Each CCE may consist of six resource element groups (REGs). The number of CCEs corresponds to the supported PDCCH aggregation level, e.g., 1, 2, 4, 8, or 16.

[0037] In some implementations, according to the control resource set (e.g., CORESET#0) configuration table, the minimum number of RBs in CORESET#0 is 24. In the example shown in Figure 1C, a PDCCH candidate for PDCCH transmission may occupy one or more CCEs depending on the aggregation level. For each CCE, the included RBs can be distributed under the mode of interleaved mapping. For dedicated spectra below 5 MHz, e.g., 3 MHz, only 15 or 16 RBs may be available. RBs for PDCCH transmission exceeding the system bandwidth cannot be used. The corresponding information in these RBs may be punctured, which results in a reduction of the aggregation level supported by the CORESET#0 configuration and a serious performance degradation. Figure 1C shows the first bandwidth of CORESET#0 and puncture (including 24 RBs). The maximum aggregation level is 4, which can be supported by PDCCH after interleaving and puncturing 4 RBs.

[0038] This disclosure describes various embodiments for transmitting information using limited channel bandwidth, addressing at least one of the aforementioned problems / challenges, minimizing degradation of PBCH reception, minimizing degradation due to insufficient PDCCH coverage, and thus improving the performance of wireless communication.

[0039] Figure 2 shows an example of an electronic device 200 implementing a network base station. The exemplary electronic device 200 may include a radio transmission / reception (Tx / Rx) circuit 208 for transmitting / receiving communications with UEs and / or other base stations. The electronic device 200 may also include a network interface circuit 209 for the base station to communicate with other base stations and / or core networks, such as optical or wired interconnects, Ethernet®, and / or other data transmission media / protocols. The electronic device 200 may optionally include an input / output (I / O) interface 206 for communicating with operators and the like.

[0040] The electronic device 200 may also include a system circuit 204. The system circuit 204 may include a processor 221 and / or memory 222. Memory 222 may include an operating system 224, instructions 226, and parameters 228. Instructions 226 may configure one or more of the processors 124 to perform the functions of a network node. Parameters 228 may include parameters to support the execution of instructions 226. For example, parameters may include network protocol settings, bandwidth parameters, radio frequency mapping assignments, and / or other parameters.

[0041] Figure 3 shows an example of an electronic device that implements a terminal device 300 (e.g., a user device (UE)). The UE 300 may be a mobile device, such as a smartphone or mobile communication module placed in a vehicle. The UE 300 may include a communication interface 302, a system circuit 304, an input / output interface (I / O) 306, a display circuit 308, and storage 309. The display circuit may include a user interface 310. The system circuit 304 may include any combination of hardware, software, firmware, or other logic / circuits. The system circuit 304 may be implemented using, for example, one or more system-on-a-chip (SoCs), application-specific integrated circuits (ASICs), separate analog and digital circuits, and other circuits. The system circuit 304 may be part of an implementation of any desired function in the UE 300. In this regard, the system circuit 304 may include logic to facilitate, for example, decoding and playback of music and video, e.g., decoding and playback of MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV; execution of applications; acceptance of user input; storage and retrieval of application data; establishment, maintenance, and termination of data connections for mobile phone calls or, as an example, internet connections; establishment, maintenance, and termination of wireless network connections, Bluetooth® connections, or other connections; and display of relevant information on the user interface 310. The user interface 310 and the input / output (I / O) interface 306 may include a graphical user interface, a touch-sensitive display, haptic feedback or other haptic output, voice or facial recognition input, buttons, switches, speakers, and other user interface elements. Further examples of the I / O interface 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headset and microphone input / output jacks, Universal Serial Bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors), and other types of inputs.

[0042] Referring to Figure 3, the communication interface 302 may include a radio frequency (RF) transmission (Tx) and reception (Rx) circuit 316 that handles the transmission and reception of signals via one or more antennas 314. The communication interface 302 may include one or more transceivers. A transceiver may be a radio transceiver that includes a modulation / demodulation circuit, a digital-to-analog converter (DAC), a shaping table, an analog-to-digital converter (ADC), filters, waveform shapers, filters, preamplifiers, power amplifiers, and / or other logic for transmitting and receiving via one or more antennas or (for some devices) via a physical (e.g., wired) medium. The signals transmitted and received may conform to one of a variety of arrays of format, protocol, modulation (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM), frequency channels, bit rate, and encoding. As a specific example, communication interface 302 may include transceivers that support transmission and reception under 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS), High-Speed ​​Packet Access (HSPA)+, 4G / Long-Term Evolution (LTE), and 5G standards. However, the technologies described below are applicable to other wireless communication technologies, whether they originate from the Third Generation Partnership Project (3GPP®), GSM® Association, 3GPP2, IEEE, or other partnerships or standardization bodies.

[0043] Referring to Figure 3, the system circuit 304 may include one or more processors 321 and memory 322. Memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute instructions 326 to perform desired functions for the UE300. Parameters 328 may provide and specify configuration and operation options for instructions 326. Memory 322 may also store any BT, WiFi, 3G, 4G, 5G, or other data that the UE300 transmits or receives via the communication interface 302. In various embodiments, the system power of the UE300 may be supplied by an energy storage device such as a battery or transformer.

[0044] This disclosure describes several embodiments that may be partially or completely implemented on the network base stations and / or user equipment described in Figures 2 and 3.

[0045] In some implementations, the minimum supported bandwidth may be 5 MHz under normal circumstances (e.g., when the subcarrier spacing (SCS) is 15 kHz). In some special scenarios, such as railways (e.g., future rail mobile communication systems (FRMCS)), smart grids, and / or public safety, the available frequency domain resources for some operators may be less than 5 MHz (e.g., 2.8–3.6 MHz or 3 MHz). For example, if the defined minimum bandwidth is less than 3.6 MHz, the original synchronization signal (SS) or physical broadcast channel (PBCH) block may exceed the minimum bandwidth, potentially causing one or more resource blocks (RBs) of the SS / PBCH block to become punctured, resulting in performance degradation or inoperability.

[0046] In various embodiments of this disclosure, channel bandwidth (BW) refers to several fixed RF bandwidth configurations supported by the UE, such as 5 MHz and 10 MHz, and transmission bandwidth configuration refers to the number of RBs actually used to transmit content within the UE's channel bandwidth. That is, the transmission bandwidth configuration is contained within the channel bandwidth as shown in Figure 4, but does not have to occupy the entire channel bandwidth. Because the number of RBs available may differ in different scenarios such as smart grids and public protection and disaster relief (PPDR), it is necessary to define different transmission bandwidths (e.g., 12 RBs, 15 RBs, etc.) for the same channel bandwidth, such as 3 MHz. In application scenarios such as FRMCS with bandwidth n100, different transmission bandwidths may be defined for the same channel bandwidth due to the coexistence requirements of GSM-R and FRMCS. Multiple transmission BWs are defined under one channel BW, but it is necessary to indicate different transmission bandwidths for the UE to receive information.

[0047] This disclosure describes various embodiments for limited-channel-bandwidth wireless communication that address at least one of the aforementioned problems / challenges, minimize degradation of PBCH reception, minimize degradation due to insufficient PDCCH coverage, and thus improve the performance of wireless communication.

[0048] Referring to Figure 5, the present disclosure describes various embodiments of Method 500 for wireless communication. Method 500 includes a step 510 in which a user device (UE) determines a transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), wherein the transmission bandwidth is among several transmission bandwidths below the channel bandwidth, and the channel bandwidth is less than a bandwidth threshold.

[0049] In some embodiments, the bandwidth threshold is 5 MHz, and / or SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and / or a PBCH demodulated reference signal (DMRS).

[0050] In some implementations, the UE determines the transmission bandwidth based on the reception of SSB at different operating bands, and / or the different operating bands correspond to specific domains or purposes.

[0051] In some embodiments, the UE derives a global synchronization channel number (GSCN) from the frequency position of the SSB, and / or the UE determines the transmission bandwidth based on the GSCN.

[0052] In some implementations, the UE determines the transmission bandwidth based on the GSCN by at least one of the following: deriving parameters from the GSCN according to an equation and using those parameters to determine the transmission bandwidth; or obtaining the remainder by GSCN mod m and using the remainder, wherein mod is a modulo operation and m is an integer greater than or equal to the number of transmission bandwidths under the same channel bandwidth.

[0053] In some implementations, the UE determines the transmission bandwidth based on the SSB frequency position by obtaining the remainder by (f / rf)mod m, where f is the SSB frequency position, rf is the raster frequency, and m is an integer greater than or equal to the number of transmission bandwidths under the same channel bandwidth, and / or by determining the transmission bandwidth using the remainder.

[0054] In some implementations, the raster frequency corresponds to a fixed synchronous raster frequency of N*100kHz, where N is a positive integer.

[0055] In some implementations, the UE determines the transmission bandwidth based on the sequence of PSSs in the SSB by obtaining a cyclic shift of the base sequence corresponding to the sequence of PSSs, deriving an index for the transmission bandwidth according to the cyclic shift of the base sequence, and / or determining the transmission bandwidth under the same channel bandwidth based on the index.

[0056] In some implementations, a PSS sequence is one of three different PSS sequences, each representing a different transmission bandwidth.

[0057] In some implementations, the UE determines the transmission bandwidth based on the sequence of SSS in the SSB by obtaining a cyclic shift of the base sequence corresponding to the sequence of SSS based on the sequence of SSS, deriving an index for the transmission bandwidth according to the cyclic shift relative to the base sequence, and / or determining the transmission bandwidth under the channel bandwidth based on the index.

[0058] In some implementations, an SSS sequence is one of 336 different SSS sequences, the 336 different SSS sequences are classified into Q groups, Q is an integer greater than or equal to the number of transmission bandwidths under the same channel bandwidth, and / or the derived index corresponds to a group within the Q groups, and the SSS sequence belongs to the said group.

[0059] In some implementations, the UE determines the transmission bandwidth based on the sequence of SSSs within the SSB by obtaining the interleaved sequence corresponding to the sequence of SSSs based on the sequence of SSSs, deriving an index for the transmission bandwidth according to the interleaved sequence, and / or determining the transmission bandwidth under the channel bandwidth based on the index.

[0060] In some implementations, the SSS sequence is one of two different interleaved SSS sequences, and / or the two different interleaved sequences are obtained by interleaving two base sequences in different interleaved orders.

[0061] In some implementations, the UE determines the transmission bandwidth based on the PBCH DMRS sequence by obtaining parameters to initialize a scrambling sequence generator corresponding to the PBCH DMRS sequence based on the PBCH DMRS sequence, deriving an index for the transmission bandwidth based on the parameters, and / or determining the transmission bandwidth under the channel bandwidth based on the index.

[0062] In some implementations, the index has one bit representing two transmission bandwidths under the same channel bandwidth, the parameter has three bits including one bit for half-frame timing, one bit for the index, and the least significant bit (LSB) of the SSB index, and / or the most significant bit (MSB) of the SSB index is obtained from a set of bits in the PBCH payload, ssb-SubcarrierOffset, or subCarrierSpacingCommon within the Master Information Block (MIB).

[0063] In some implementations, the index has 2 bits representing four transmission bandwidths under the same channel bandwidth, the parameter has 3 bits including 1 bit for half-frame timing and 2 bits for the index, and / or the 2 bits for the SSB index are obtained from a set of bits in the MIB's PBCH payload, ssb-SubcarrierOffset, or subCarrierSpacingCommon.

[0064] In some implementations, the index has one bit representing two transmission bandwidths under the same channel bandwidth, the parameter has three bits including one bit for the index and two bits for the SSB index, and / or one bit for half-frame timing, indicated by a fifth bit in the PBCH payload, ssb-SubcarrierOffset, or subCarrierSpacingCommon within the MIB.

[0065] In some implementations, the index has 2 bits representing four transmission bandwidths under the same channel bandwidth, the parameter has 3 bits including the 2 bits of the index and the LSB of the SSB index, the 1 bit of half-frame timing is indicated by a fifth bit in the PBCH payload, and / or the most significant bit (MSB) of the SSB index is obtained from a set of bits in the PBCH payload, ssb-SubcarrierOffset, or subCarrierSpacingCommon in the MIB.

[0066] In some implementations, the set of bits in the PBCH payload includes three bits, which are the sixth, seventh, and eighth bits in the PBCH payload. Embodiment Set I

[0067] This disclosure describes various embodiments of methods, systems, or computer-readable media for indicating different transmission bandwidths corresponding to the same channel bandwidth.

[0068] In some embodiments, different operating bands are defined for different transmission bandwidths corresponding to the same channel bandwidth. For example, for a channel bandwidth of 3 MHz, two potential transmission bandwidths (e.g., 15 RB and 12 RB) may be supported. Then, two operating bands are defined for them: operating band X is defined for the 15 RB transmission bandwidth, with upper and lower frequency boundaries, and operating band Y is defined for the 12 RB transmission bandwidth. Frequency overlap may exist between these bands, which may not be a problem in general, as different transmission bandwidths are not used in the same area (e.g., the same country). Thus, for a particular domain or purpose, the UE may support specific bands to uniquely determine the supported transmission bandwidths.

[0069] In some embodiments, the frequency position of the SS block (SS REFThe global synchronization channel number (GSCN) corresponding to (as defined) is given by the formula for the dedicated spectrum below 5 MHz. In some implementations, one or more parameters in the formula may relate to the transmission bandwidth.

[0070] For example, the formula could also be 3N + (M-3) / 2, in which case N and M are integers. The parameter M can be a value of {1, 3, 5}. Different values ​​of M can be used to represent different transmission bandwidths, respectively. Thus, upon detecting an SSB, the UE can obtain the current corresponding transmission bandwidth according to the M value calculated according to the frequency position of the detected SSB in order to receive the next signal.

[0071] In another example, in the equation 3N + (M-3) / 2, the parameter N may be a value from 1 to 2499. Different values ​​of N can be used to represent different transmission bandwidths, respectively. When an SSB is detected, the UE can know the current corresponding transmission bandwidth according to the value of N obtained by calculation based on the frequency position at which the UE detected the SSB, in order to receive subsequent signals.

[0072] Regarding another example, in the formula 3N + (M-3) / 2, M can be a value within {1, 3, 5} and N can be a value from 1 to 2499. Different combinations of {N,M} values ​​can be used to represent different transmission bandwidths. When an SSB is detected, the UE can know the current corresponding transmission bandwidth according to the combination of {N,M} values ​​obtained by calculation based on the frequency position at which the UE detected the SSB, in order to receive subsequent signals.

[0073] In some embodiments, the value of GSCN mod m is used to indicate different transmission bandwidths, where mod is a modulo operation that returns the remainder of a division, and m is greater than or equal to the number of different transmission bandwidths under the same channel bandwidth. When an SSB is detected, the UE can determine the current corresponding transmission bandwidth according to the value of GSCN mod m, and the GSCN is obtained by calculation according to the frequency position where the UE detected the SSB in order to receive a subsequent signal.

[0074] In some embodiments, the synchronous raster is fixed as 100 kHz for dedicated spectra below 5 MHz, (SS REF (Synchronized raster) The value of mod n can be used to indicate different transmission bandwidths, SS REF is the frequency position of the SS block, and n is greater than or equal to the number of transmission bandwidths under the same channel bandwidth. In other words, the value is the remainder obtained by dividing the quotient of the SSB frequency position by the raster frequency by m. In some implementations, the synchronization raster frequency may be a positive integer multiple of 100 kHz, such as 200 kHz, 300 kHz, 500 kHz, 800 kHz, etc.

[0075] For example, the channel bandwidth is 3 MHz, and there are two types of transmission bandwidths, 15 RB and 16 RB, so the number of transmission bandwidths under the same channel bandwidth is 2. For one example, n=2 is selected. [ka] In this case, the transmission bandwidth is indicated as 15RB, (SS REF ( / 100kHz) When mod2=1, the transmission bandwidth is shown as 16RB. Embodiment Set II

[0076] This disclosure describes various embodiments of a method, system, or computer-readable medium for indicating different transmission bandwidths using PSS or SSS sequences. In some implementations, the application scenarios of dedicated spectrum systems are relatively simple and do not require indicating 1008 cell IDs, so different transmission bandwidths can be indicated using PSS and / or SSS sequences.

[0077] In some embodiments, different PSS signal sequences are used to indicate different transmission bandwidths. For example, as shown in the following formula, there are three different sequences of PSS signals, namely {x0}, {x1}, and {x2}, each corresponding to a different cyclic shift of a base maximum length sequence (M-sequence) with a length of 127.

Number

[0078] In some implementation forms, three different transmission bandwidths are defined by a transmission bandwidth index (i band ), and i band may be {0, 1, 2}. Each value of the index (i band ) corresponds to a different cyclic shift of the base M-sequence. In other words, each value of i band corresponds to a different cyclic shift of a specific sequence of PSS signals as follows.

Number

[0079] Therefore, three different transmission bandwidths can be indicated using three different cyclic shifts of the PSS signal sequence. When the SSS signal is detected, the current transmission bandwidth can be determined by identifying which specific sequence it is. The number of cell IDs that can be indicated using the SSS signal is 336.

[0080] In some embodiments, different sequences of SSS signals are used to represent different transmission bandwidths. In some implementations, there may be 336 different sequences of SSS signals for each PSS signal, each sequence corresponding to a different cyclic shift. The 336 different sequences can be classified into Q groups, where Q is greater than or equal to the amount of different transmission bandwidths. Q different transmission bandwidths are represented by a transmission bandwidth index (i band Defined by i band These can each be {0, 1, 2, ..., Q-1}. band Each value corresponds to a different set of cyclic shifts, in other words, i band Each value corresponds to a specific set of SSS signal sequences. When an SSS signal is detected, the current transmission bandwidth can be determined by identifying which particular set the sequence belongs to. The number of cell IDs that can be indicated using PSS and SSS signals is 3*(336 / Q).

[0081] In some embodiments, different interleaved sequences of m1 and m2 in the SSS signal can be used to represent two different transmission bandwidths. Similar to the sequences of the SSS signal in some implementations, two M sequences (m1 and m2) having length 31 are interleaved to generate two types of SSS, namely SSS1 and SSS2. For example, in SSS1, the sequence of m1 precedes the sequence of m2, and in SSS2, the sequence of m2 precedes the sequence of m1. After receiving the SSS signal, the current transmission bandwidth can be obtained by detecting either the SSS1 or SSS2 sequence. Embodiment Set III

[0082] This disclosure describes various embodiments of a method, system, or computer-readable medium for indicating different transmission bandwidths using PBCH DMRS sequences. The base station parameters [ka] The PBCH DMRS sequence scrambling sequence generator can be initialized by defining the following. In some implementations, in scenarios where the frequency is less than 3 GHz, the maximum number of SS / PBCH blocks included in the SS block burst set is 4, thereby i SSB These are 0, 1, 2, and 3, respectively. In other words, there is 2 bits of SSB index information carried by the DMRS sequence. In some implementations, in the first frequency range (FR1), some bits of the PBCH payload may be reserved or reused to indicate the SSB index, so that the 2 bits of the SSB index carried by the DMRS sequence can be used to indicate different transmission bandwidths.

[0083] In some embodiments, two different transmission bandwidths are defined by a transmission bandwidth index (i band Defined by i band These can each be 0 or 1. Different PBCH DMRS sequences are used to indicate two types of transmission bandwidth and two types of SSB indices. Therefore, another bit is needed to indicate one MSB of the SSB index, which is the following 3 bits in the PBCH payload. [ka] It could be any one of the following. In other words, the PBCH DMRS sequence includes a 1-bit transmission bandwidth index, a 1-LSB SSB index, and a 1-bit half-frame timing. [ka] It is initialized by [this method]. [ka] So, the 1-bit half-frame timing is at its MSB, followed by the 1-bit transmission bandwidth index, and then the LSB, which is the 1LSB SSB index. The PBCH DMRS sequence is parameter [ka] It is generated by defining it by the following formula. In some implementations, 1MSB of the SSB index can be any bit of ssb-SubcarrierOffset or subCarrierSpacingCommon in the MIB.

number

[0084] In some embodiments, four different transmission bandwidths are defined by a transmission bandwidth index (i band Defined by i band These may be 0, 1, 2, or 3, respectively. Different PBCH DMRS sequences are used to indicate four different transmission bandwidths. The two bits indicating the SSB index are the following two bits in the PBCH payload. [ka] It can be any two bits. In other words, the PBCH DMRS sequence is initialized with a 2-bit transmission bandwidth index and a 1-bit half-frame timing. The PBCH DMRS sequence is parameter [ka] It is generated by defining it with the following formula. In some implementations, the two bits of the SSB index can be either the two bits of ssb-SubcarrierOffset or subCarrierSpacingCommon in the MIB.

number

[0085] The PBCH DMRS sequence is parameter [ka] It is generated by defining n, where n hf This is half-frame timing, and this is with the PBCH payload. [ka] This is shown again by the DMRS sequence n hf The information can be reused to show different transmission bandwidths of dedicated spectra below 5 MHz, with a frequency range of approximately 900 MHz.

[0086] In some embodiments, two different transmission bandwidths are defined by a transmission bandwidth index (i band Defined by i band These can each be 0 or 1. Different PBCH DMRS sequences are used to indicate two types of transmission bandwidth and four types of SSB indices. In other words, a PBCH DMRS sequence is initialized with a 1-bit transmission bandwidth index and a 2-bit SSB index. The PBCH DMRS sequence is parameter [ka] It is generated by defining it using the following formula.

number

[0087] In some embodiments, four different transmission bandwidths are defined by a transmission bandwidth index (i band Defined by i bandThese can each be 0, 1, 2, or 3. Different PBCH DMRS sequences are used to indicate four different transmission bandwidths and 1 LSB SSB indices. Therefore, another 1 bit is needed to indicate one MSB of the SSB index, which is the following 3 bits in the PBCH payload. [ka] It could be either of the following. In other words, the PBCH DMRS sequence is initialized with a 2-bit transmission bandwidth index and a 1-LSB SSB index. The PBCH DMRS sequence is parameter [ka] It is generated by defining it by the following formula. In some implementations, 1MSB of the SSB index can be any bit of ssb-SubcarrierOffset or subCarrierSpacingCommon in the MIB.

number

[0088] This disclosure describes various embodiments of methods, systems, or computer-readable media for reducing system performance losses caused by limited frequency domain resources.

[0089] In some embodiments, as shown in Figure 6A, the initial downlink bandwidth portion (DLBWP) (620) is defined within the available system bandwidth (610), and the initial DLBWP is less than or equal to the available system bandwidth in the frequency domain.

[0090] In some embodiments, referring to Figure 6B, the first bandwidth (630) of control resource set number 0 (e.g., CORESET#0) is configured to receive the System Information Block (SIB1) PDCCH, and the second bandwidth (640) of CORESET#0 is configured to receive signals other than the SIB1 PDCCH, such as paging, SIBs other than SIB1(OSI), Msg2, Msg4, or at least one of other unicast PDCCHs. In some implementations, the first bandwidth of CORESET#0 may consist of PBCHs, for example, containing 24 RBs. The number of resources occupied by the second bandwidth of CORESET#0 in the frequency domain is the same as the initial DLBWP, which consists of SIB1, as shown in Figure 6B.

[0091] In some implementations, with a CORESET#0 configuration having a first bandwidth, some data may be punctured due to the limited channel bandwidth. The UE needs to determine a dedicated spectral range to detect PDCCH after puncture.

[0092] In some implementations, the dedicated spectral range is determined from the determined system bandwidth. In some implementations, k ssb = 0, which means the synchronous raster overlaps with the channel raster in the RAN4 definition, and the available RBs of the frequency position and system bandwidth are determined to be the same as the SSB bandwidth. In some implementations, k ssb ≠0, and the frequency position of the system BW is SS REF -k ssb Therefore, the available RBs in the system bandwidth are one more RB than the RBs used for SSB transmission.

[0093] In some implementations, for PDCCHs detected within CORESET#0 which has a second bandwidth, PDCCH candidates are mapped within the second bandwidth of CORESET#0. Figure 7 shows the second bandwidth of CORESET#0 (16RB) in the available system bandwidth, demonstrating that higher aggregation levels (e.g., AL=8) may be supported with similarly limited frequency domain resources, in other words, greater coverage than the puncture scheme shown in Figure 1C may be supported.

[0094] In some embodiments, methods for solving problems related to power boosting can be described. Power boosting may be used for PBCH to reduce performance loss due to a reduction in the number of RBs. This can result in a measurement mismatch between the value obtained from measuring the PBCH DMRS and the value obtained from measuring the SSS during neighbor cell measurements, e.g., synchronous signal reference signal received power (SS-RSRP). This problem can be solved by defining an offset of the PBCH DMRS energy per resource element (EPRE) relative to the SSSEPRE and notifying the offset and the number of RBs relative to the neighboring cell or UE below the neighboring cell.

[0095] In some embodiments, the number of OFDM symbols in CORESET#0 may be extended (e.g., up to 4) to reduce PDCCH reception performance loss resulting from a reduction in the number of RBs. This may result in competition between PDCCH DMRS and the extended PDCCH.

[0096] Some embodiments for resolving conflicts between PDSCH DMRS and extended PDCCH may include extending the definition of the time-domain symbol position of PDSCH DMRS. For example, it becomes possible to map PDSCH DMRS from the fifth and sixth symbols of a slot based on slot scheduling. In other words, for PDSCH mapping type A, DMRS-TypeA-Position=pos4 or DMRS-TypeA-Position=pos5 are acceptable.

[0097] In some embodiments for resolving conflicts between PDSCH DMRS and Extended PDCCH, the PDSCH DMRS on a fifth or sixth OFDM symbol in a slot conflicts with the DCI information of the Extended PDCCH. One method involves the PDSCH DMRS performing a mapping to non-conflicting resources using a rate-matching scheme to ensure the integrity of the Extended PDCCH information.

[0098] In some embodiments for resolving conflicts between PDSCH DMRS and Extended PDCCH, the PDSCH DMRS on the fifth or sixth OFDM symbol in a slot conflicts with the PDCCH DMRS of Extended PDCCH. One method involves not sending PDSCH DMRS on the conflicting resources. Thus, PDCCH and PDCCH share PDCCH DMRS, which means that PDSCH uses PDCCH DMRS to perform channel estimation.

[0099] This disclosure describes methods, apparatus, and computer-readable media for wireless communication. This disclosure addresses the problems of wireless communication with limited channel bandwidth. The methods, devices, and computer-readable media described in this disclosure can facilitate the performance of wireless transmission between user equipment and base stations, and thus improve efficiency and overall performance. The methods, devices, and computer-readable media described in this disclosure can improve the overall efficiency of wireless communication systems.

[0100] Throughout this specification, references to features, benefits, or similar terms do not imply that all features and benefits that may be realized by the Solution should or will be included in any single implementation thereof. Rather, any terms referring to features and benefits should be understood to mean that certain features, benefits, or characteristics described in relation to an embodiment are included in at least one embodiment of the Solution. Accordingly, descriptions of features and benefits, and similar terms throughout this specification, may, but not necessarily, refer to the same embodiment.

[0101] Furthermore, the features, advantages, and characteristics described herein can be combined in any suitable manner in one or more embodiments. Those skilled in the art will recognize, in light of the description herein, that the present solution can be implemented without one or more of the particular features or advantages of a particular embodiment. In other examples, further features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.

Claims

1. A method for wireless communication, wherein the method is The user equipment (UE) determines the transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), wherein the transmission bandwidth includes a certain number of resource blocks (RBs) within the UE channel bandwidth, which are used for transmission. Includes, The UE channel bandwidth is 3 MHz. The aforementioned transmission bandwidth is one of several transmission bandwidths within the aforementioned UE channel bandwidth. The method wherein the plurality of transmission bandwidths include 15 resource blocks (RBs) and 12 RBs.

2. The method according to claim 1, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS).

3. The UE derives the global synchronization channel number (GSCN) from the frequency position of the SSB, The UE determines the transmission bandwidth based on the GSCN. The method according to any one of claims 1 to 2, further comprising:

4. Determining the transmission bandwidth based on the GSCN means that Deriving parameters from the GSCN according to the formula, and using those parameters to determine the transmission bandwidth, or The method involves obtaining the remainder by GSCN mod m and using the remainder to determine the transmission bandwidth, where mod is a modulo operation and m is an integer greater than or equal to the number of transmission bandwidths under the channel bandwidth. The method according to claim 3, comprising at least one of the following.

5. The aforementioned UE, The remainder is obtained by (f / rf) mod m, where f is the frequency position of the SSB, rf is the raster frequency, and m is an integer greater than or equal to the number of transmission bandwidths under the channel bandwidth. The transmission bandwidth is determined using the aforementioned remainder. This further includes determining the transmission bandwidth based on the frequency position of the SSB, Preferably, the raster frequency corresponds to a fixed synchronous raster frequency of N * 100 kHz, where N is a positive integer, according to any one of claims 1 to 2.

6. The aforementioned UE, Based on the PSS sequence, obtain a cyclic shift for the base sequence corresponding to the PSS sequence, The index for the transmission bandwidth is derived according to the cyclic shift for the basic sequence, Based on the aforementioned index, the transmission bandwidth is determined under the same channel bandwidth. This involves determining the transmission bandwidth based on the sequence of PSS within the SSB, or The aforementioned UE, Based on the SSS sequence, obtain a cyclic shift for the basic sequence corresponding to the SSS sequence, The index for the transmission bandwidth is derived according to the cyclic shift for the basic sequence, Based on the aforementioned index, the transmission bandwidth is determined under the channel bandwidth. The method according to any one of claims 1 to 2, further comprising determining the transmission bandwidth based on the sequence of SSSs within the SSB.

7. The method according to claim 1, preferably further comprising the UE determining the transmission bandwidth in bandwidth n100.

8. It is a device, Memory for storing instructions, At least one processor that communicates with the memory and Equipped with, When the at least one processor executes the instruction, the at least one processor, Determining the transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), wherein the transmission bandwidth includes a number of resource blocks (RBs) within the UE channel bandwidth and is used for transmission. The device is configured to perform the above action, The UE channel bandwidth is 3 MHz. The aforementioned transmission bandwidth is one of several transmission bandwidths within the aforementioned UE channel bandwidth. The device comprises 15 resource blocks (RBs) and 12 RBs, respectively, with the aforementioned multiple transmission bandwidths.

9. The apparatus according to claim 8, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS).

10. When the at least one processor executes the instruction, the at least one processor, The global synchronization channel number (GSCN) is derived from the frequency position of the aforementioned SSB, Determining the transmission bandwidth based on the GSCN The apparatus according to claim 8, configured to cause the apparatus to perform the above.

11. The apparatus according to claim 8, wherein when the at least one processor executes the instruction, the at least one processor is configured to cause the apparatus to determine the transmission bandwidth in bandwidth n100.

12. A non-temporary computer-readable medium for storing instructions, wherein the instructions, when executed by a computer, Determining the transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), wherein the transmission bandwidth includes a number of resource blocks (RBs) within the UE channel bandwidth and is used for transmission. It is configured to cause the computer to perform the following: The UE channel bandwidth is 3 MHz. The aforementioned transmission bandwidth is one of several transmission bandwidths within the aforementioned UE channel bandwidth. The aforementioned multiple transmission bandwidths are non-temporary computer-readable media comprising 15 resource blocks (RBs) and 12 RBs.

13. The non-temporary computer-readable medium according to claim 12, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS).

14. When the aforementioned instruction is executed by the computer, The global synchronization channel number (GSCN) is derived from the frequency position of the aforementioned SSB, Determining the transmission bandwidth based on the GSCN A non-temporary computer-readable medium according to claim 12, configured to cause the computer to perform the action.

15. The non-temporary computer-readable medium according to claim 12, wherein the instruction, when executed by the computer, causes the computer to determine the transmission bandwidth in bandwidth n100.

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