Method, device, and system 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] The present disclosure generally relates to wireless communication. In particular, the present disclosure relates to methods, devices, and systems for wireless communication with limited channel bandwidth.

Background Art

[0002] Background Wireless communication technology is moving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communication depends on efficient network resource management and allocation between user equipment and wireless access network nodes (including but not limited to base stations). The new generation of networks is expected to achieve high-speed, low-latency, and ultra-high-reliability communication capabilities to meet the requirements from various industries and users.

[0003] With the rapid evolution of cellular mobile communication systems, an increasing number of cells are operating at higher frequencies. In the fifth-generation mobile communication technology, the minimum supported bandwidth can be 5 MHz with a 15 KHz subcarrier spacing (SCS) in normal situations. In some special scenarios, railways (e.g., future railway mobile communication systems (FRMCS)) can have available frequency region resources of 2.8 - 3.6 MHz, smart grids and / or public safety and / or public protection and disaster relief (PPDR) can have available frequency resources of about 3 MHz, and the available frequency region resources of some operators can be less than 5 MHz. When the bandwidth is less than 5 MHz, the available frequency region resources can be different. In different service scenarios, the UE needs to know what the actual available transmission bandwidth is. For example, when 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 (RBs) of the SS / PBCH block exceeding the minimum bandwidth are punctured, which may result in performance degradation. The SSB block can include a primary synchronization signal (PSS) block and / or a secondary synchronization signal (SSS) block. In another example, a limited bandwidth (e.g., less than 3.6 MHz) reduces the aggregation level supported by the control resource set (CORESET), resulting in insufficient coverage of the physical downlink control channel (PDCCH).

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

Summary of the Invention

Means for Solving the Problems

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

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

[0007] 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.

[0008] In some other embodiments, a device 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.

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

[0010] The above and other aspects and their implementations are described in more detail in the figures, description, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011]

Figure 1A

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Figure 1B

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Figure 1C

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Figure 2

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Figure 3

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Figure 4

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Figure 5

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Figure 6A

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Figure 6B

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Figure 7

Mode for Carrying Out the Invention

[0021] Detailed Description With reference to the accompanying drawings that form a part of this disclosure and illustrate specific examples of embodiments, the present disclosure will be described in detail below. However, it should be noted that the present disclosure may be embodied in various different forms, and thus the subject matter included or claimed is not intended to be limited to any of the embodiments described below.

[0022] Throughout this specification and the claims, terms may have nuanced meanings that are suggested or implied in context beyond their explicitly stated meaning. Similarly, phrases such as "in one embodiment" or "in some embodiments" as used herein do not necessarily refer to the same embodiment, and phrases such as "in another embodiment" or "in other embodiments" as used herein do not necessarily refer to different embodiments. Phrases such as "in one implementation" or "in some implementations" as used herein do not necessarily refer to the same implementation, and phrases such as "in another implementation" or "in other implementations" as used herein do not necessarily refer to different implementations. For example, the claimed subject matter is intended to include, in whole or in part, combinations of exemplary embodiments or implementations.

[0023] Generally, terms can be understood, at least in part, from their use in context. For example, terms such as "and," "or," or "and / or" as used herein may include various meanings that may depend, at least in part, on the context in which such terms are used. Typically, "or" as used to associate a list such as A, B, or C is intended to mean A, B, and C in an inclusive sense here, as well as A, B, or C in an exclusive sense here. Further, terms such as "one or more" or "at least one" as used herein may, at least in part, depend on context, be used to describe any feature, structure, or characteristic in a singular sense, or be used to describe a combination of features, structures, or characteristics in a plural sense. Similarly, terms such as "a," "an," or "the" as used herein may be understood, at least in part, from context, to convey either a singular or plural usage. Further, terms such as "based on" or "determined by" may not necessarily be intended to convey an exclusive set of factors, and instead, may, at least in part, depend on context, allow for the existence of additional factors not necessarily explicitly described.

[0024] This disclosure describes a method and a device for wireless communication with limited channel bandwidth.

[0025] The new generation (NG) mobile communication system is moving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communication depends on efficient network resource management and allocation between user equipment and wireless access network nodes (including but not limited to radio base stations). The new generation network is expected to achieve high-speed, low-latency, and ultra-high-reliability communication capabilities and meet the requirements from various industries and users.

[0026] With the rapid evolution of cellular mobile communication systems, an increasing number of cells are operating at higher frequencies. In the case of the fifth-generation mobile communication technology, the minimum supported bandwidth can be 5 MHz in normal situations (e.g., when the subcarrier spacing (SCS) is 15 KHz). In some special scenarios such as railways (e.g., future railway mobile communication systems (FRMCS)), smart grids, and / or public safety, the available frequency domain resources of some operators can 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 region resources can be different. In different service scenarios, the UE needs to know the actual available transmission bandwidth.

[0027] When the available frequency resources are less than the bandwidth threshold (e.g., 5 MHz), there can be various problems / issues. Some problems / issues may include that when 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 (RBs) of the SS / PBCH block exceeding the minimum bandwidth may be punctured, resulting in performance degradation or inoperability. The SSB block may include a primary synchronization signal (PSS) block and / or a secondary synchronization signal (SSS) block. Another problem / issues may include that a limited bandwidth (e.g., less than 3.6 MHz) may reduce the aggregation level supported by the control resource set (CORESET), potentially leading to insufficient physical downlink control channel (PDCCH) coverage. Another problem / issues may include that when the bandwidth is less than 5 MHz, the available frequency domain resources may be different. In different service scenarios, the UE needs to know the actual available transmission bandwidth. For example, FRMCS may require a very flexible L1 transmission bandwidth in band n100 to support a gradual transition from Global System for Mobile Communications - Railway (GSM-R) to FRMCS. Another problem / issues 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 can have some of the advantages of providing solutions for identifying different transmission bandwidths, addressing at least one of the aforementioned problems / issues, minimizing degradation in PBCH reception, minimizing degradation due to insufficient PDCCH coverage, and thus improving the performance of wireless communication.

[0029] FIG. 1A shows a wireless communication system 100 including a wireless network node 118 and one or more user equipment (UE) 110. The wireless network node may include a network base station, and the network base station may be a Node B (NB, e.g., gNB) in a mobile telecommunication context. Each of the UEs may wirelessly communicate with the wireless network node via one or more wireless channels 115. For example, the first UE 110 may wirelessly communicate with the wireless network node 118 via a channel including a plurality of wireless channels during a certain time period. The network base station 118 may transmit upper layer signaling to the UE 110. The upper layer signaling may include configuration information for communication between the UE and the base station. In one embodiment, the upper layer signaling may include a Radio Resource Control (RRC) message.

[0030] FIG. 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) in the frequency domain and four consecutive time domain symbols. 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 the fourth symbol (164) are mapped to the PBCH. Each RB (171) of the PBCH may include three Demodulation Reference Signal (DMRS) resource elements (REs) (173) for channel estimation. In some implementations, the CORESET may occupy at least 24 RB of frequency domain resources.

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

[0032] In some implementations, for the first frequency range (FR1) (e.g., sub - 6 GHz frequency), for example, 3 - bit timing information indicating an SSB index or an SSB index and a half - frame indication is carried by PBCH DMRS. Eight sequences corresponding to the 3 bits can be defined for 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 at the SSB and the eight local DMRS sequences.

[0033] In some implementations, eight sequences are defined for each cell in NR for PBCH DMRS. That is, 3-bit information is carried by PBCH DMRS. Therefore, the SSB index or the SSB index and the half-frame indication can be indicated by initializing the DMRS sequence as in the following formula, where C init is the initial value,

Chem.

[0034]

Math.

[0035] In some implementations,

Chem.

Chem.

Chem.

[0036] In some implementations, the physical downlink control channel (PDCCH) can be transmitted in a CORESET using one or more control channel elements (CCE). Each CCE can be composed of six resource element groups (REG). The number of CCEs corresponds to the supported PDCCH aggregation levels, 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 of CORESET#0 is 24. In the example shown in Figure 1C, PDCCH candidates for PDCCH transmission may occupy one or more CCEs according to the aggregation level. For each CCE, the included RBs may be distributed under the mode of interleaving mapping. In the case of dedicated spectrum less than 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 in the aggregation level supported by the CORESET#0 configuration and a serious performance degradation. Figure 1C shows CORESET#0 and the first bandwidth (including 24 RBs) of puncturing. The maximum aggregation level is 4, which can be supported by the PDCCH after interleaving and puncturing 4 RBs.

[0038] The present disclosure describes various embodiments for transmitting information using a limited channel bandwidth, addressing at least one of the aforementioned problems / issues, minimizing the degradation of PBCH reception, minimizing the 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 wireless transmission / reception (Tx / Rx) circuit 208 for transmitting / receiving communication with a UE and / or other base stations. The electronic device 200 may also include a network interface circuit 209 for communicating the base station with other base stations and / or a core network, e.g., optical or wired interconnection, Ethernet (registered trademark), and / or other data transmission media / protocols. The electronic device 200 may optionally include an input / output (I / O) interface 206 for communicating with an operator, etc.

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

[0041] FIG. 3 shows an example of an electronic device implementing a terminal device 300 (e.g., a user equipment (UE)). The UE 300 may be a mobile device, e.g., a smartphone or a mobile communication module disposed within 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 a 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, for example, using one or more system-on-chips (SoCs), application-specific integrated circuits (ASICs), discrete analog and digital circuits, and other circuits. The system circuit 304 may be part of the implementation of any desired function in the UE 300. In that regard, the system circuit 304 may include, by way of example, logic to facilitate the decoding and playback of music and video, e.g., the decoding and playback of MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV, the execution of applications, the reception of user input, the storage and retrieval of application data, the establishment, maintenance, and termination of a cellular phone call, or, by way of example, the establishment, maintenance, and termination of a data connection for an Internet connection, the establishment, maintenance, and termination of a wireless network connection, a Bluetooth® connection, or other connections, and the 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, tactile feedback or other tactile output, voice or face recognition input, buttons, switches, speakers, and other user interface elements. Further examples of the I / O interface 306 may include a microphone, 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 input.

[0042] Referring to FIG. 3, the communication interface 302 may include radio frequency (RF) transmit (Tx) and receive (Rx) circuitry 316 that processes the transmission and reception of signals via one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceiver may be a wireless transceiver that includes modulation / demodulation circuitry, digital-to-analog converters (DACs), shaping tables, analog-to-digital converters (ADCs), filters, waveform shapers, filters, preamplifiers, power amplifiers, and / or other logic for transmitting and receiving via one or more antennas or, in the case of some devices, via a physical (e.g., wired) medium. The signals transmitted and received may conform to any of a variety of arrays of format, protocol, modulation (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM), frequency channel, bit rate, and coding. As a specific example, the 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 techniques described below are applicable to other wireless communication technologies regardless of whether they arise from the 3rd Generation Partnership Project (3GPP®), GSM® Association, 3GPP2, IEEE, or other partnership or standards body.

[0043] Referring to FIG. 3, the system circuit 304 may include one or more processors 321 and a memory 322. The memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute the instructions 326 to perform desired functions for the UE 300. The parameters 328 may provide and specify the configuration and operation options of the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, or other data transmitted or received by the UE 300 via the communication interface 302. In various embodiments, the system power of the UE 300 may be supplied by a power storage device such as a battery or a transformer.

[0044] The present disclosure describes several embodiments that may be implemented partially or wholly on the network base station and / or user equipment described above in FIGS. 2-3.

[0045] In some implementations, the minimum supported bandwidth can be 5 MHz in normal situations (e.g., when the subcarrier spacing (SCS) is 15 KHz). In some special scenarios such as railways (e.g., future railway mobile communication systems (FRMCS)), smart grids, and / or public safety, the available frequency domain resources of some operators can 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, and one or more resource blocks (RBs) of the SS / PBCH block that exceed the minimum bandwidth are punctured, which may result in performance degradation or inoperability.

[0046] In various embodiments of the present disclosure, the channel bandwidth (BW) refers to several fixed RF bandwidth configurations supported by the UE, such as 5 MHz and 10 MHz, and the transmission bandwidth configuration refers to the number of resource blocks (RBs) actually used to transmit content with the UE's channel bandwidth. That is, the transmission bandwidth configuration is included within the channel bandwidth as shown in FIG. 4, but does not have to fully occupy the channel bandwidth. Since the number of available RBs may be different in different scenarios such as smart grid 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 an applicable scenario such as the FRMCS of band n100, different transmission bandwidths may be defined for the same channel bandwidth due to the coexistence requirements between GSM-R and FRMCS. Although multiple transmission BWs are defined under one channel BW, it is necessary to indicate different transmission bandwidths for the UE to receive information.

[0047] The present disclosure addresses at least one of the aforementioned problems / issues, minimizes the degradation of PBCH reception, minimizes the degradation due to insufficient PDCCH coverage, and thus describes various embodiments for wireless communication with limited channel bandwidth that improve the performance of wireless communication.

[0048] Referring to FIG. 5, the present disclosure describes various embodiments of a method 500 for wireless communication. The method 500 includes step 510 of 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 under the channel bandwidth, and the channel bandwidth being smaller than a bandwidth threshold.

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

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

[0051] In some embodiments, the UE derives the 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 derives a parameter from the GSCN according to an equation and uses the parameter to determine the transmission bandwidth, or obtains a remainder by GSCN mod m and uses 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, and determines the transmission bandwidth based on the GSCN by at least one of these.

[0053] In some implementations, the UE obtains a remainder 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, and / or determines the transmission bandwidth based on the frequency position of the SSB by using the remainder to determine the transmission bandwidth.

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

[0055] In some implementations, the UE obtains the cyclic shift of the basic sequence corresponding to the PSS sequence based on the PSS sequence, derives an index for the transmission bandwidth according to the cyclic shift with respect to the basic sequence, and / or determines the transmission bandwidth under the same channel bandwidth based on the index, thereby determining the transmission bandwidth based on the PSS sequence within the SSB.

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

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

[0058] In some implementations, the 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 among the Q groups, and the SSS sequence belongs to the group.

[0059] In some implementations, the UE determines the transmission bandwidth based on the SSS sequence in the SSB by obtaining an interleaving sequence corresponding to the SSS sequence based on the SSS sequence, deriving an index for the transmission bandwidth according to the interleaving 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 interleaving sequences are obtained by interleaving two basic sequences in different interleaving orders.

[0061] In some implementations, the UE obtains parameters for initializing a scrambling sequence generator corresponding to the PBCH DMRS sequence based on the PBCH DMRS sequence, derives an index for the transmission bandwidth based on the parameters, and / or determines the transmission bandwidth under the channel bandwidth based on the index, thereby determining the transmission bandwidth based on the PBCH DMRS sequence within the SSB.

[0062] In some implementations, the index has 1 bit representing two transmission bandwidths under the same channel bandwidth, the parameter has 3 bits including 1 bit of half-frame timing, 1 bit of 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 within the master information block (MIB), ssb-SubcarrierOffset, or subCarrierSpacingCommon.

[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 of half-frame timing and 2 bits of the index, and / or the 2 bits of the SSB index are obtained from a set of bits in the PBCH payload of the MIB, ssb-SubcarrierOffset, or subCarrierSpacingCommon.

[0064] In some implementations, the index has 1 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, and / or the 1 bit of half-frame timing is indicated by a fifth bit in the PBCH payload within the MIB, ssb-SubcarrierOffset, or subCarrierSpacingCommon.

[0065] In some implementations, the index has 2 bits representing 4 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, 1 bit of the half-frame timing is indicated by the 5th 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 3 bits including the 6th bit, 7th bit, and 8th bit in the PBCH payload. Embodiment Set I

[0067] This disclosure describes various embodiments of a method, system, or computer-readable medium 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 3 MHz channel bandwidth, two potential transmission bandwidths (e.g., 15 RBs and 12 RBs) may be supported. Next, two operating bands are defined for them, an operating band X with upper and lower frequency boundaries for a transmission bandwidth of 15 RBs is defined, and an operating band Y is defined for a transmission bandwidth of 12 RBs. There may be a frequency overlap between these bands, which generally may not be a problem because different transmission bandwidths are not used in the same area (e.g., the same country). Thus, for a particular region or purpose, the UE may support a particular band to uniquely determine the supported transmission bandwidth.

[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 an equation for dedicated spectrum less than 5 MHz. In some implementations, one or more parameters in the equation may be related to the transmission bandwidth.

[0070] As an example, the equation may be 3N+(M - 3) / 2, where N and M are integers. The parameter M can take values of {1, 3, 5}. Different values of M can each be used to indicate different transmission bandwidths. Thus, when 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 subsequent signal.

[0071] Regarding 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 each be used to indicate different transmission bandwidths. When detecting an SSB, the UE can know the current corresponding transmission bandwidth according to the value of N obtained by calculation based on the frequency position where the UE detected the SSB in order to receive the subsequent signal.

[0072] Regarding another example, in the equation 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 values of {N, M} can be used to indicate different transmission bandwidths. When detecting an SSB, the UE can know the current corresponding transmission bandwidth according to the combination of values of {N, M} obtained by calculation based on the frequency position where the UE detected the SSB in order to receive the subsequent signal.

[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 detecting an SSB, the UE can determine the current corresponding transmission bandwidth according to the value of GSCN mod m, and GSCN is obtained by calculation according to the frequency position where the UE detects the SSB for receiving subsequent signals.

[0074] In some embodiments, the synchronization raster is fixedly defined as 100 kHz for dedicated spectrum less than 5 MHz, and the value of (SS REF / synchronization raster) mod n can be used to indicate different transmission bandwidths, where 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 dividing the frequency position of the SSB by the raster frequency by m. In some implementation forms, 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, if the channel bandwidth is 3 MHz and there are two types of transmission bandwidths, 15RB and 16RB, the number of transmission bandwidths under the same channel bandwidth is 2. For one example, n = 2 is selected,

Chemical formula

[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 scenario of a dedicated spectrum system is relatively simple and does 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 indicate different transmission bandwidths. In some implementations, there may be 336 different sequences of SSS signals for each PSS signal, and each sequence corresponds to a different cyclic shift. The 336 different sequences can be classified into Q groups. Q is greater than or equal to the amount of different transmission bandwidths. Q different types of transmission bandwidths are defined by a transmission bandwidth index (i band ) and i band may each be {0, 1, 2,..., Q - 1}. Each value of i band corresponds to a different set of cyclic shifts. In other words, each value of i band corresponds to a specific set of sequences of SSS signals. When an SSS signal is detected, the current transmission bandwidth can be determined by identifying which specific 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 interleaving sequences of m1 and m2 of the SSS signal can be used to indicate two different transmission bandwidths. Similar to the sequences of the SSS signal in some implementations, two M sequences (m1 and m2) having a length of 31 are interleaved to generate two types of SSS, namely SSS1 and SSS2. For example, in SSS1, the sequence of m1 is before the sequence of m2, and in SSS2, the sequence of m2 is before the sequence of m1. After receiving the SSS signal, the current transmission bandwidth can be obtained by detecting the sequence of either SSS1 or SSS2. Embodiment Set III

[0082] The present disclosure describes various embodiments of a method, system, or computer-readable medium for indicating different transmission bandwidths using PBCH DMRS sequences. The base station is a parameter

Chemical formula

[0083] In some embodiments, two different transmission bandwidths are defined by the transmission bandwidth index (i band ), and i band can be 0 or 1 respectively. Different PBCH DMRS sequences are used to indicate two types of transmission bandwidths and two types of SSB indexes. Therefore, another 1 bit is required to indicate one MSB of the SSB index, which can be any one of the following 3 bits in the PBCH payload

Chemical

Chemical

Chemical

Chem.

Math.

[0084] In some embodiments, the four different transmission bandwidths are defined by the transmission bandwidth index (i band ), and i band can be 0, 1, 2, or 3 respectively. Different PBCH DMRS sequences are used to indicate the four transmission bandwidths. The 2 bits indicating the SSB index can be any 2 bits of the following 2 bits

Chem.

Chem.

Math.

[0085] The PBCH DMRS sequence is generated by defining the parameter

Chem.

Chem.

[0086] In some embodiments, two different transmission bandwidths are defined by the transmission bandwidth index (i band ), and i band may each be 0 or 1. Different PBCH DMRS sequences are used to indicate two types of transmission bandwidths and four types of SSB indexes. In other words, the PBCH DMRS sequence is initialized by a 1-bit transmission bandwidth index and a 2-bit SSB index. The sequence of PBCH DMRS is generated by defining the parameter

Chem.

Math.

[0087] In some embodiments, four different transmission bandwidths are defined by the transmission bandwidth index (i band ), and i bandmay each be 0, 1, 2, or 3. Different PBCH DMRS sequences are used to indicate four types of transmission bandwidths and the 1 LSB of the SSB index. Therefore, another 1 bit is required to indicate one MSB of the SSB index, which is the following 3 bits within the PBCH payload

Chem.

Chem.

Math.

[0088] The present disclosure describes various embodiments of a method, system, or computer-readable medium for reducing system performance loss caused by limited frequency domain resources.

[0089] In some embodiments, as shown in FIG. 6A, an initial downlink bandwidth part (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 FIG. 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 SIB1 PDCCH, such as at least one of paging, SIBs other than SIB1 (OSI), Msg2, Msg4, or other unicast PDCCHs. In some implementations, the first bandwidth of CORESET#0, which includes, for example, 24 resource blocks (RBs), may be configured by the physical broadcast channel (PBCH). The number of resources occupied by the second bandwidth of CORESET#0 in the frequency domain is the same as the initial downlink bandwidth part (DLBWP) configured by SIB1 as shown in FIG. 6B.

[0091] In some implementations, in the case of the CORESET#0 configuration with the first bandwidth, since the channel bandwidth is limited, some data may be punctured. The UE needs to determine a dedicated spectrum range to detect the PDCCH after puncturing.

[0092] In some implementations, the dedicated spectrum range is determined from the determined system bandwidth. In some implementations, k ssb = 0, which means that the synchronization raster overlaps with the channel raster in the RAN4 definition, and the available resource blocks (RBs) for the frequency position and the 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 bandwidth is SS REF - k ssb and the available RBs of the system bandwidth are one more RB than the RBs used for SSB transmission.

[0093] In some implementations, for the PDCCH detected within CORESET#0 having a second bandwidth, the PDCCH candidates are mapped within the second bandwidth of CORESET#0. FIG. 7 shows the second bandwidth (16 RBs) of CORESET#0 in the available system bandwidth, indicating that a higher aggregation level (e.g., AL = 8) can be supported with similarly restricted frequency domain resources, in other words, a coverage larger than the puncturing pattern shown in FIG. 1C can be supported.

[0094] In some embodiments, a method for solving problems related to power boosting can be described. Power boosting can be used for PBCH to reduce the performance loss due to the reduction in the number of RBs. This can result in a measurement inconsistency between the value obtained from measuring PBCH DMRS and the value obtained from measuring SSS during neighboring cell measurement, for example, the synchronization 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) with respect to SSSEPRE and notifying the offset and the number of RBs for an adjacent cell or a UE under an adjacent cell.

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

[0096] Some embodiments for resolving the conflict between PDSCH DMRS and the enhanced PDCCH may include extending the definition of the time-domain symbol position of PDSCH DMRS. For example, it becomes possible to map PDSCH DMRS based on slot scheduling from the 5th and 6th symbols of a slot. In other words, for PDSCH mapping type A, DMRS-TypeA-Position = pos4 or DMRS-TypeA-Position = pos5 is allowed.

[0097] In some embodiments for resolving the conflict between PDSCH DMRS and the enhanced PDCCH, the PDSCH DMRS on the 5th or 6th OFDM symbol within a slot conflicts with the DCI information of the enhanced PDCCH. One way includes having the PDSCH DMRS perform mapping on resources other than the conflicting ones in a rate matching manner to ensure the integrity of the enhanced PDCCH information.

[0098] In some embodiments for resolving the conflict between PDSCH DMRS and the enhanced PDCCH, the PDSCH DMRS on the 5th or 6th OFDM symbol within a slot conflicts with the PDCCH DMRS of the enhanced PDCCH. One way includes not transmitting the PDSCH DMRS on the conflicting resources. Therefore, the PDCCH and the PDCCH share the PDCCH DMRS, which means that the PDSCH uses the PDCCH DMRS to perform channel estimation.

[0099] The present disclosure describes a method, an apparatus, and a computer-readable medium for wireless communication. The present disclosure addresses the problems related to wireless communication with limited channel bandwidth. The method, device, and computer-readable medium described in the present disclosure facilitate the performance of wireless transmission between a user equipment and a base station, and thus may improve efficiency and overall performance. The method, device, and computer-readable medium described in the present disclosure can improve the overall efficiency of a wireless communication system.

[0100] Throughout this specification, references to features, advantages, or similar language do not imply that all of the features and advantages realizable by the solution should or must be included in any single implementation. Rather, the language referring to the features and advantages is understood to mean that a particular feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the solution. Accordingly, the descriptions of the features and advantages throughout this specification, and similar language, may, but do not necessarily, refer to the same embodiment.

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

Claims

1. A method for wireless communication, the method comprising: determining a transmission bandwidth by a user equipment (UE) receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB); wherein the transmission bandwidth is among a plurality of transmission bandwidths below a channel bandwidth; and the channel bandwidth is smaller than a bandwidth threshold.

2. The bandwidth threshold is 5 MHz; the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS); The method according to claim 1.

3. The UE determines the transmission bandwidth based on reception of SSBs in different operating bands; the different operating bands correspond to a specific area or purpose. The method according to claims 1 to 2.

4. The UE derives a global synchronization channel number (GSCN) from the frequency position of the SSB; and the UE determines the transmission bandwidth based on the GSCN. The method according to any one of claims 1 to 2.

5. The UE derives a parameter from the GSCN according to a formula and uses the parameter to determine the transmission bandwidth, or obtains a remainder by GSCN mod m and uses 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 claim 4, wherein the transmission bandwidth is determined based on the GSCN by at least one of the above.

6. The UE obtains a remainder 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; and uses the remainder to determine the transmission bandwidth. The method according to any one of claims 1 to 2, wherein the transmission bandwidth is determined based on the frequency position of the SSB by the above.

7. The raster frequency corresponds to a fixed synchronization raster frequency of N*100 kHz, where N is a positive integer. The method according to claim 6.

8. The UE obtains a cyclic shift with respect to a basic sequence corresponding to the sequence of the PSS based on the sequence of the PSS. Deriving an index for the transmission bandwidth according to the cyclic shift with respect to the basic sequence; Determining the transmission bandwidth under the same channel bandwidth based on the index; The method according to any one of claims 1 to 2, wherein the transmission bandwidth is determined based on the sequence of the PSS in the SSB. **Claim 9** The method according to claim 8, wherein the sequence of the PSS is one of three different PSS sequences each indicating a different transmission bandwidth. **Claim 10** The UE Obtaining a cyclic shift with respect to a basic sequence corresponding to the sequence of the SSS based on the sequence of the SSS; Deriving an index for the transmission bandwidth according to the cyclic shift with respect to the basic sequence; Determining the transmission bandwidth under the channel bandwidth based on the index; The method according to any one of claims 1 to 2, wherein the transmission bandwidth is determined based on the sequence of the SSS in the SSB. **Claim 11** The sequence of the SSS is one of 336 different SSS sequences; The 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 of the Q groups, and the sequence of the SSS belongs to the group. The method according to claim 10. **Claim 12** The UE Obtaining an interleaving sequence corresponding to the sequence of the SSS based on the sequence of the SSS; Deriving an index for the transmission bandwidth according to the interleaving sequence; Determining the transmission bandwidth under the channel bandwidth based on the index; The method according to any one of claims 1 to 2, wherein the transmission bandwidth is determined based on the sequence of the SSS in the SSB. **Claim 13** The sequence of the SSS is one of two different interleaved SSS sequences; The two different interleaving sequences are obtained by interleaving two basic sequences in different interleaving orders. The method according to claim 12. **Claim 14** The UE Obtaining parameters for initializing a scrambling sequence generator corresponding to the sequence of the PBCH DMRS based on the sequence of the PBCH DMRS; Deriving an index for the transmission bandwidth based on the parameters; Determining the transmission bandwidth under the channel bandwidth based on the index The method according to any one of claims 1 to 2, wherein the transmission bandwidth is determined based on the sequence of the PBCH DMRS in the SSB.

15. The index has 1 bit representing two transmission bandwidths under the same channel bandwidth, The parameters have 3 bits including 1 bit of half-frame timing, 1 bit of the index, and the least significant bit (LSB) of the SSB index, 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 master information block (MIB), The method according to claim 14.

16. The index has 2 bits representing four transmission bandwidths under the same channel bandwidth, The parameters have 3 bits including 1 bit of half-frame timing and 2 bits of the index, The 2 bits of the SSB index are obtained from a set of bits in the PBCH payload, ssb-SubcarrierOffset, or subCarrierSpacingCommon in the MIB, The method according to claim 14.

17. The index has 1 bit representing two transmission bandwidths under the same channel bandwidth, The parameters have 3 bits including 1 bit of the index and 2 bits of the SSB index, 1 bit of half-frame timing is indicated by the 5th bit in the PBCH payload, The method according to claim 14.

18. The index has 2 bits representing four transmission bandwidths under the same channel bandwidth, The parameters have 3 bits including the 2 bits of the index and the LSB of the SSB index, 1 bit of half-frame timing is indicated by the 5th bit in the PBCH payload, The most significant bit (MSB) of the SSB index is obtained from a set of bits within the PBCH payload, The method according to claim 14.

19. The set of bits within the PBCH payload includes three bits including the sixth bit, the seventh bit, and the eighth bit within the PBCH payload. The method according to any one of claims 15 to 18.

20. A wireless communication device comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement the method according to any one of claims 1 to 19.

21. A computer program product in which computer-readable program media code is stored, wherein the computer-readable program media code causes the processor to implement the method according to any one of claims 1 to 19 when executed by the processor.

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