Method, apparatus and system for wireless transmission with limited channel bandwidth

Abstract

The present disclosure describes methods, systems, and devices for wireless communication with limited channel bandwidth. A method includes determining, by a user equipment (UE), a transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), where the transmission bandwidth is one of a plurality of transmission bandwidths under a channel bandwidth, and the channel bandwidth is less than a bandwidth threshold.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communications. In particular, the present disclosure relates to methods, devices, and systems for wireless communications with limited channel bandwidth. Background Art

[0002] Wireless communication technology is driving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communications rely on efficient network resource management and allocation between user devices and radio access network nodes (including but not limited to base stations). The next-generation network is expected to provide high-speed, low-latency and ultra-reliable communication capabilities and meet the requirements of different industries and users.

[0003] With the rapid development of cellular mobile communication systems, more and more cells will operate at higher frequencies. For the fifth generation mobile communication technology, in general, the minimum supported bandwidth may be 5MHz, and the subcarrier spacing (SCS) is 15KHz. In some special scenarios, the railway system (e.g., the future railway mobile communication system (FRMCS)) has only 2.8 to 3.6MHz of available frequency domain resources, and the smart grid and / or public safety and / or public protection and disaster relief (PPDR) have only about 3MHz of available frequency resources, and some operators have available frequency domain resources less than 5MHz. When the bandwidth is less than 5MHz, the available frequency domain resources may 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 3.6MHz, 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. The SSB block includes a primary synchronization signal (PSS) block and a secondary synchronization signal (SSS) block. For another example, limited bandwidth (eg, less than 3.6 MHz) may reduce the aggregation level supported by the control resource set (CORESET), resulting in insufficient coverage of the physical downlink control channel (PDCCH).

[0004] The present disclosure describes various embodiments for wireless communications with limited channel bandwidth, addresses at least one of the issues / problems discussed above, minimizes performance loss in PBCH reception, minimizes performance loss due to insufficient PDCCH coverage, and thereby improves the performance of wireless communications. Summary of the invention

[0005] The present disclosure relates to methods, systems, and devices for wireless communications, and more particularly, to systems, methods, and devices for wireless communications with limited channel bandwidth.

[0006] In one embodiment, the present disclosure describes a method for wireless communication. The method includes determining, by a user equipment (UE), a transmission bandwidth by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), wherein: the transmission bandwidth is among a plurality of transmission bandwidths and within a 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 system in communication with the memory. When the processing circuit system executes the instructions, the processing circuit system 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 system in communication with the memory. When the processing circuit system executes the instructions, the processing circuit system 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 implementations thereof are described in more detail in the drawings, the description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1A An example of a wireless communication system including a radio network node and one or more user equipments is shown.

[0012] Figure 1B A schematic diagram of an exemplary embodiment for wireless communications is shown.

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

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

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

[0016] Figure 4 A schematic diagram of an exemplary embodiment for wireless communications is shown.

[0017] Figure 5 A flow chart of a method for wireless communication is shown.

[0018] Fig. 6A A schematic diagram of an exemplary embodiment for wireless communications is shown.

[0019] Figure 6BAnother schematic diagram of an exemplary embodiment for wireless communications is shown.

[0020] Figure 7 An example of another exemplary embodiment for wireless communications is shown. DETAILED DESCRIPTION

[0021] The present disclosure will now be described in detail below with reference to the accompanying drawings, which form a part of the present disclosure and show specific examples of embodiments by way of illustration. However, it is noted that the present disclosure may be embodied in a variety of different forms and, therefore, the subject matter covered or claimed is intended to be construed as not being limited to any of the embodiments set forth below.

[0022] Throughout the specification and claims, terms may have subtle meanings that are implied or suggested in the context beyond the explicitly stated meaning. Similarly, the phrases "in one embodiment" or "in some 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 some implementations" used herein do not necessarily refer to the same implementation, and the terms "in another implementation" or "in other implementations" used herein do not necessarily refer to different implementations. For example, the claimed subject matter includes combinations of exemplary embodiments or implementations (all or part).

[0023] In general, terms can be understood at least in part from usage in context. For example, terms used herein (such as "and", "or", "and / or") can include multiple meanings, which can depend at least in part on the context in which such terms are used. Typically, "or" if used in an associative list, such as A, B, or C, means A, B, and C, which are used here in an inclusive sense, and A, B, or C, which are used here only in an exclusive sense. In addition, the terms "one or more" or "at least one" used herein (depending at least in part on the context) can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, and characteristics in a plural sense. Similarly, terms such as "one", "an", or "the" can also be understood to convey singular or plural usage, which depends at least in part on the context. In addition, the term "based on" or "determined by..." can be understood to not necessarily be intended to convey a set of exclusive factors, but rather, other factors that are not necessarily explicitly described can be allowed to exist, which again depends at least in part on the context.

[0024] The present disclosure describes methods and apparatus for wireless communications with limited channel bandwidth.

[0025] Next-generation (NG) mobile communication systems are driving the world towards an increasingly connected and networked society. High-speed, low-latency wireless communications rely on efficient network resource management and allocation between user devices and radio access network nodes (including but not limited to radio base stations). The next-generation network is expected to provide high-speed, low-latency, and ultra-reliable communication capabilities and meet the requirements of different industries and users.

[0026] With the rapid development of cellular mobile communication systems, more and more cells will operate at higher frequencies. For the fifth generation mobile communication technology, in general (for example, when the subcarrier spacing (SCS) is 15KHz), the minimum supported bandwidth may be 5MHz. In some special scenarios, such as railway systems (for example, future railway mobile communication systems (FRMCS)), smart grids and / or public safety, the available frequency domain resources of some operators may be less than 5MHz (for example, 2.8-3.6MHz or 3MHz). When the bandwidth is less than 5MHz, the available frequency domain resources may 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 a bandwidth threshold (e.g., 5 MHz), various issues / problems may exist. Some issues / problems may include: 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 failure to work. The SSB block may include a primary synchronization signal (PSS) block and / or a secondary synchronization signal (SSS) block. Another issue / problem may include: limited bandwidth (e.g., less than 3.6 MHz) may reduce the aggregation level supported by the control resource set (CORESET), resulting in insufficient coverage of the physical downlink control channel (PDCCH). Another issue / problem may include: 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 fairly flexible L1 transmission bandwidth in band n100 to support a gradual migration from the Global System for Mobile Communications Railways (GSM-R) to FRMCS. Another issue / problem may include signal performance loss on some channels due to available bandwidth being less than 5 MHz.

[0028] The present disclosure describes various embodiments for wireless communications with limited channel bandwidth. These various embodiments may have some of the following advantages: provide a solution for identifying different transmission bandwidths, solve at least one of the above issues / problems, minimize performance loss of PBCH reception, minimize performance loss due to insufficient PDCCH coverage, thereby improving the performance of wireless communications.

[0029] Figure 1A A wireless communication system 100 is shown that includes a radio network node 118 and one or more user equipment (UE) 110. The radio network node may include a network base station, which may be a nodeB (NB, e.g., gNB) in a mobile telecommunication context. Each of the UEs may wirelessly communicate with the radio network node via one or more radio channels 115. For example, a first UE 110 may wirelessly communicate with the radio network node 118 via a channel including a plurality of radio channels during a specific time period. The network base station 118 may send high-layer signaling to the UE 110. The high-layer signaling may include configuration information for communication between the UE and the base station. In one implementation, the high-layer signaling may include a radio resource control (RRC) message.

[0030] Figure 1B An example of the structure of a synchronization signal (SS) / physical broadcast channel (PBCH) (SS / PBCH) block (SSB) is shown. The SS / PBCH block occupies 20 resource blocks (RBs) in the frequency domain and 4 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 3 demodulation reference signal (DMRS) resource elements (REs) (173) for channel estimation. In some implementations, the 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. The detailed resource mapping of signals (including PSS, SSS, PBCH DMRS) and channels (PBCH) is as follows: Figure 1BAs shown. More specifically, in the time domain, PSS and SSS occupy the first symbol and the third symbol in the SS / PBCH block, respectively. And, PBCH is mapped in the second symbol, the third symbol, and the fourth symbol. In the frequency domain, PSS and SSS occupy RE48-RE 191. 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 RE 0-RE 47 (i.e., RB 0-RB 3) and RE 192-RE 239 (i.e., RB 16-RB 19). In each PBCH PRB, DMRS is mapped on three REs out of 12 REs. Then, there are 144 REs mapped with PBCH DMRS. Therefore, the sequence length of PBCH DMRS is 144.

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

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

[0034]

[0035] In some implementations, there are 1008 unique physical layer cell identities (PCIs), which are represented by Given, where For NR, there are 3 different PSS signal sequences and 336 different SSS signal sequences for each PSS signal to indicate 1008 PCIs.

[0036] In some implementations, the physical downlink control channel (PDCCH) may be transmitted in a CORESET using one or more control channel elements (CCEs). Each CCE may consist of 6 resource element groups (REGs). The number of CCEs corresponds to the supported PDCCH aggregation level, such as 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 for CORESET#0 is 24. Figure 1C In the example shown, a PDCCH candidate for PDCCH transmission may occupy one or more CCEs depending on the aggregation level. For each CCE, the included RBs may be distributed in an interleaved mapping mode. For a dedicated spectrum less than 5 MHz, such as 3 MHz, only 15 or 16 RBs may be available. RBs for PDCCH transmission exceeding the system bandwidth cannot be used. The corresponding information about these RBs may be punctured, which results in a reduction in the aggregation level supported by the CORESET#0 configuration and severe performance degradation. Figure 1C CORESET#0 and the first bandwidth (comprising 24 RBs) of puncturing are shown. The maximum aggregation level that can be supported by the PDCCH is 4 after being interleaved and punctured by 4 RBs.

[0038] The present disclosure describes various embodiments for sending information with limited channel bandwidth, addressing at least one of the issues / problems discussed above, minimizing performance loss in PBCH reception, minimizing performance loss due to insufficient PDCCH coverage, and thereby improving the performance of wireless communications.

[0039] Figure 2 An example of an electronic device 200 for implementing a network base station is shown. The example electronic device 200 may include a radio transmit / receive (Tx / Rx) circuit system 208 for sending / receiving communications with UEs and / or other base stations. The electronic device 200 may also include a network interface circuit system 209 for enabling the base station to communicate with other base stations and / or a core network (e.g., 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 an operator or the like.

[0040] The electronic device 200 may also include a system circuit system 204. The system circuit system 204 may include (multiple) processors 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 for one or more processors in the processor 124 to perform the functions of the 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 allocations, and / or other parameters.

[0041] Figure 3 An example of an electronic device for implementing a terminal device 300 (e.g., a user equipment (UE)) is shown. UE 300 may be a mobile device, such as a smart phone or a mobile communication module provided in a vehicle. UE 300 may include a communication interface 302, a system circuit system 304, an input / output interface (I / O) 306, a display circuit system 308, and a memory 309. The display circuit system may include a user interface 310. The system circuit system 304 may include any combination of hardware, software, firmware, or other logic / circuitry systems. The system circuit system 304 may be implemented, for example, with one or more systems on a chip (SoC), application specific integrated circuits (ASICs), discrete analog and digital circuits, and other circuit systems. The system circuit system 304 may be part of the implementation of any desired function in UE 300. In this regard, the system circuit system 304 may include logic that facilitates, for example, decoding and playing music and videos, such as MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback; running applications; accepting user input; saving and retrieving application data; establishing, maintaining, and terminating cellular phone calls or data connections, such as Internet connections; establishing, maintaining, and terminating wireless network connections, Bluetooth connections, or other connections; and displaying 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 facial recognition input, buttons, switches, speakers, and other user interface elements. Additional examples of the I / O interface 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headphone 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] refer to Figure 3, the communication interface 302 may include a radio frequency (RF) transmission (Tx) and reception (Rx) circuit system 316 for processing signal transmission and reception through one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceiver may be a wireless transceiver that includes a modulation / demodulation circuit system, a digital-to-analog converter (DAC), a shaping table, an analog-to-digital converter (ADC), a filter, a waveform shaper, a filter, a preamplifier, a power amplifier, and / or other logic for transmitting and receiving through one or more antennas or (for some devices) through a physical (e.g., wired) medium. The signals sent and received may follow any of a variety of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM), frequency channels, bit rates, and encodings. As a specific example, the communication interface 302 may include a transceiver that supports 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, whether produced by the 3rd Generation Partnership Project (3GPP), the GSM Association, 3GPP2, IEEE, or other partners or standards bodies.

[0043] refer to Figure 3 , the system circuit system 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 implement the desired functions of the UE 300. The parameters 328 may provide and specify configuration and operating options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, or other data that the UE 300 will send or has received through the communication interface 302. In various implementations, the system power for the UE 300 may be provided by a power storage device such as a battery or a transformer.

[0044] The present disclosure describes several embodiments as follows, which may be partially or completely implemented in Figure 2-Figure 3 The method is implemented on the network base station and / or user equipment described in the embodiment.

[0045] In some implementations, under normal circumstances (e.g., when the subcarrier spacing (SCS) is 15KHz), the minimum supported bandwidth may be 5MHz. In some special scenarios, such as railway systems (e.g., future railway mobile communications system (FRMCS)), smart grids, and / or public safety, the available frequency domain resources of some operators may be less than 5MHz (e.g., 2.8-3.6MHz or 3MHz). For example, when the defined minimum bandwidth is less than 3.6MHz, 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 may be punctured, resulting in performance degradation or failure to work.

[0046] In various embodiments of the present disclosure, channel bandwidth (BW) refers to a number of fixed RF bandwidth configurations supported by a UE, such as 5 MHz and 10 MHz; and transmission bandwidth configuration refers to the number of RBs actually used to transmit content in the channel bandwidth of the UE. That is, the transmission bandwidth configuration is included in the following examples: Figure 4 The channel bandwidth is within the channel bandwidth shown, but the channel bandwidth may not be fully occupied. Since the number of available RBs may be different in different scenarios such as smart grid and public protection and disaster relief (PPDR), different transmission bandwidths (for example, 12 RBs, 15 RBs, etc.) need to be defined for the same channel bandwidth such as 3 MHz. For application scenarios such as FRMCS in band n100, different transmission bandwidths can be defined for the same channel bandwidth due to the coexistence requirements of GSM-R and FRMCS. When multiple transmission BWs are defined under one channel BW, it is necessary to indicate different transmission bandwidths for UE to receive information.

[0047] The present disclosure describes various embodiments for wireless communications with limited channel bandwidth, addresses at least one of the issues / problems discussed above, minimizes performance loss in PBCH reception, minimizes performance loss due to insufficient PDCCH coverage, and thereby improves the performance of wireless communications.

[0048] refer to Figure 5 , the present disclosure describes various embodiments of a method 500 for wireless communication. The method 500 includes step 510, i.e., determining, by a user equipment (UE) by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB), a transmission bandwidth, wherein: the transmission bandwidth is among a plurality of transmission bandwidths and in a channel bandwidth, and the channel bandwidth is less than a bandwidth threshold.

[0049] In some implementations, 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 receiving SSBs in different operating frequency bands, and / or the different operating frequency bands correspond to specific areas or purposes.

[0051] In some implementations, the UE derives a global synchronization channel number (GSCN) from the frequency location 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 a parameter from the GSCN according to a formula and using the parameter to determine the transmission bandwidth, or obtaining a remainder by GSCN mod m and using the remainder to determine the transmission bandwidth, where mod is a modular operation and m is an integer equal to or greater than the number of transmission bandwidths under the same channel bandwidth.

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

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

[0055] In some implementations, the UE determines the transmission bandwidth based on the sequence of the PSS in the SSB in the following manner: based on the sequence of the PSS, obtain a cyclic shift of a base sequence corresponding to the sequence of the PSS, derive an index for the transmission bandwidth based on the cyclic shift of the base sequence, and / or based on the index, determine the transmission bandwidth under the same channel bandwidth.

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

[0057] In some implementations, the UE determines the transmission bandwidth based on the sequence of the SSS in the SSB in the following manner: based on the sequence of the SSS, obtains a cyclic shift of a base sequence corresponding to the sequence of the SSS, derives an index for the transmission bandwidth based on the cyclic shift for the base sequence, and / or determines the transmission bandwidth under the channel bandwidth based on the index.

[0058] In some implementations, the sequence of SSS is an SSS sequence among 336 different SSS sequences, the 336 different SSS sequences are classified into Q groups, where Q is an integer equal to or greater than 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 sequence of SSS belongs to the group.

[0059] In some implementations, the UE determines the transmission bandwidth based on the sequence of the SSS in the SSB in the following manner: based on the sequence of the SSS, obtaining an interleaving sequence corresponding to the sequence of the SSS, deriving an index for the transmission bandwidth according to the interleaving sequence, and / or based on the index, determining the transmission bandwidth under the channel bandwidth.

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

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

[0062] In some implementations, the index has one bit, which represents two transmission bandwidths under the same channel bandwidth; the parameter has three bits, which include one bit of half-frame timing, one bit of 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 the following items: a set of bits in the PBCH payload, ssb-SubcarrierOffset or subCarrierSpacingCommon in the master information block (MIB).

[0063] In some implementations, the index has two bits, which represent four transmission bandwidths under the same channel bandwidth; the parameter has three bits, which include one bit of half-frame timing and two bits of index; and / or the two bits of SSB index are obtained from: a bit set in the PBCH payload, ssb-SubcarrierOffset in the MIB, or subCarrierSpacingCommon.

[0064] In some implementations, the index has one bit, which represents two transmission bandwidths under the same channel bandwidth; the parameter has three bits, which include one bit of index and two bits of SSB index; and / or one bit of half-frame timing is indicated by the fifth bit in the PBCH payload, ssb-SubcarrierOffset or subCarrierSpacingCommon in the MIB.

[0065] In some implementations, the index has two bits, indicating four transmission bandwidths under the same channel bandwidth; the parameter has three bits, including two 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; and / or the most significant bit (MSB) of the SSB index is obtained from: a bit set in the PBCH payload, ssb-SubcarrierOffset in the MIB, or subCarrierSpacingCommon.

[0066] In some implementations, the set of bits in the PBCH payload includes three bits, including a sixth bit, a seventh bit, and an eighth bit in the PBCH payload.

[0067] Embodiment Set I

[0068] The present disclosure describes various embodiments of a method, system, or computer-readable medium for indicating different transmission bandwidths corresponding to the same channel bandwidth.

[0069] 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 RBs and 12 RBs) can be supported. Then, two operating bands are defined for them, an operating band X with upper and lower frequency boundaries is defined for a transmission bandwidth of 15 RBs, and an operating band Y is defined for a transmission bandwidth of 12 RBs. There may be frequency overlap between these bands, which may not generally be a problem because different transmission bandwidths are not used in the same region (e.g., the same country). Therefore, for a specific region or purpose, the UE may support a specific band to uniquely determine the supported transmission bandwidth.

[0070] In some embodiments, for dedicated spectrum less than 5 MHz, the global synchronization channel number (GSCN) corresponding to the frequency position of the SS block (defined as SS REF ) is given by a formula. In some implementations, one or more parameters in the formula may be related to the transmission bandwidth.

[0071] For example, the formula may be 3N+(M-3) / 2, where N and M are integers. The parameter M may be a value in {1, 3, 5}. Different values ​​of M may be used to indicate different transmission bandwidths, respectively. Therefore, when an SSB is detected, the UE may obtain the current corresponding transmission bandwidth according to the M value, thereby receiving subsequent signals, and the M value is calculated according to the frequency position of the detected SSB.

[0072] For another example, in the formula 3N+(M-3) / 2, the parameter N may be a value from 1 to 2499. Different values ​​of N may be used to indicate different transmission bandwidths. When an SSB is detected, the UE may learn the current corresponding transmission bandwidth according to the value of N, thereby receiving subsequent signals. The value of N is obtained by calculation according to the frequency position of the SSB detected by the UE.

[0073] For another example, in the formula 3N+(M-3) / 2, M can be a value in {1, 3, 5}, and N can be a value from 1 to 2499. Different value combinations of {N, M} can be used to indicate different transmission bandwidths. When an SSB is detected, the UE can learn the current corresponding transmission bandwidth according to the value combination of {N, M}, so as to receive subsequent signals. The value combination of {N, M} is obtained by calculation according to the frequency position where the UE detects the SSB.

[0074] In some embodiments, the value of GSCN mod m is used to indicate different transmission bandwidths, where mod is a modulus operation that returns the remainder of a division, and m is equal to or greater than 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 based on the value of GSCN mod m, and the GSCN is obtained by calculation based on the frequency position at which the UE detects the SSB, thereby receiving subsequent signals.

[0075] In some embodiments, for dedicated spectrum less than 5 MHz, the synchronization grid is fixedly defined as 100 kHz, (SS REF / sync grid) mod n value can be used to indicate different transmission bandwidths, and SS REF is the frequency position of the SS block, and n is equal to or greater than the number of transmission bandwidths under the same channel bandwidth. In other words, this value is the remainder obtained by dividing the frequency position of the SSB by the grid frequency and then dividing it by m. In some implementations, the synchronization grid frequency can be a positive integer multiple of 100kHz, such as 200kHz, 300kHz, 500kHz, 800kHz, etc.

[0076] For example, the channel bandwidth is 3 MHz, and there are two types of transmission bandwidths: 15 RBs and 16 RBs, so the number of transmission bandwidths under the same channel bandwidth is 2. For example, n=2 is selected; when When (SS REF / 100kHz)mod 2=1, the transmission bandwidth is indicated as 16 RBs.

[0077] Example Set II

[0078] The present disclosure describes various embodiments of methods, systems, or computer-readable media for using PSS or SSS sequences to indicate different transmission bandwidths. In some implementations, PSS and / or SSS sequences can be used to indicate different transmission bandwidths because the application scenarios of dedicated spectrum systems are relatively simple and do not require indicating up to 1008 cell IDs.

[0079] In some embodiments, different sequences of the PSS signal are used to indicate different transmission bandwidths. For example, the PSS signal has three different sequences: {x0}, {x1}, and {x2}, which correspond to different cyclic shifts of a basic maximum length sequence (M sequence), and its length is 127, as shown in the following equation.

[0080] x0(n)=x(n)=x(n+0*43mod127)

[0081] x1(n)=x(n+43mod 127)=x(n+1*43mod 127)

[0082] x2(n)=x(n+86mod 127)=x(n+2*43mod127)

[0083] In some implementations, the transmission band index (i band ) defines three different transmission bandwidths, and i band Can be {0, 1, 2}. Index (i band ) corresponds to a different cyclic shift of the base M sequence; in other words, i band Each value of corresponds to a different cyclic shift of a particular sequence of the PSS signal, as shown below.

[0084] d PSS =x(n+(43i band )mod127)

[0085] Therefore, three different cyclic shifts of the PSS signal sequence can be used to indicate three different transmission bandwidths. 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.

[0086] In some embodiments, different SSS signal sequences are used to indicate different transmission bandwidths. In some implementations, for each PSS signal in the PSS signal, there may be 336 different SSS signal sequences, and each sequence corresponds to a different cyclic shift. The 336 different sequences may be classified into Q groups. Q is equal to or greater than the number of different transmission bandwidths. The transmission band index (i band ) defines Q different transmission bandwidths, and i band They can be {0,1,2,...,Q-1} respectively. band Each value of corresponds to a different set of cyclic shifts; in other words, i band Each value of 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 specific set the sequence belongs to. The number of cell IDs that can be indicated using PSS signals and SSS signals is 3*(336 / Q).

[0087] In some embodiments, different interleaved sequences of m1 and m2 of the SSS signal can be used to indicate two different transmission bandwidths. Similar to the SSS signal sequence in some implementations, two M sequences (m1 and m2) of length 31 are interleaved to generate two types of SSS: SSS1 and SSS2. For example, in SSS1, the m1 sequence precedes the m2 sequence; and in SSS2, the m2 sequence precedes the m1 sequence. After receiving the SSS signal, the current transmission bandwidth can be obtained by detecting which sequence of SSS1 and SSS2.

[0088] Example Set III

[0089] The present disclosure describes various embodiments of methods, systems, or computer-readable media for using PBCH DMRS sequences to indicate different transmission bandwidths. The base station can define parameters To initialize the scrambling sequence generator of the PBCH DMRS sequence. In some implementations, in scenarios where the frequency is lower than 3 GHz, the maximum number of SS / PBCH blocks included in the SS block burst set is 4, so that i SSB 0, 1, 2 and 3 respectively. In other words, the DMRS sequence carries 2 bits of information of the SSB index. In some implementations, in the first frequency range (FR1), some bits of the PBCH payload are reserved or can be 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.

[0090] In some embodiments, the transmission band index (i band ) defines two different transmission bandwidths, and i bandcan be 0 or 1 respectively. Different PBCH DMRS sequences are used to indicate two transmission bandwidths and two SSB indexes. Therefore, another 1 bit is needed to indicate 1 MSB of the SSB index, which can be the following three bits in the PBCH payload (i.e., ) in any one of the bits. In other words, the PBCH DMRS sequence is composed of Initialization, which includes 1 bit of transmission band index, 1 LSB of SSB index and 1 bit of half frame timing. In the PBCH DMRS sequence, 1 bit of half-frame timing is at its MSB, followed by 1 bit of transmission band index, and then 1 LSB of SSB index at its LSB. The PBCH DMRS sequence is defined by the parameters in the following equation: In some implementations, the 1 MSB of the SSB index can be any bit of ssb-SubcarrierOffset or subCarrierSpacingCommon in the MIB.

[0091]

[0092] In some embodiments, the transmission band index (i band ) defines four different transmission bandwidths, and i band The 2 bits used to indicate the SSB index can be the following two bits in the PBCH payload (i.e., ) . In other words, the PBCH DMRS sequence is initialized by a 2-bit transmission band index and a 1-bit half-frame timing. The PBCH DMRS sequence is defined by the parameters in the following equation: In some implementations, the two bits of the SSB index may be 2 bits of ssb-SubcarrierOffset or subCarrierSpacingCommon in the MIB.

[0093]

[0094] The PBCH DMRS sequence is defined by the parameter To generate, where n hf is the half frame timing, which is determined by Therefore, the n carried by the DMRS sequence hf The information may be reused to indicate different transmission bandwidths of less than 5 MHz of dedicated spectrum in the frequency range around 900 MHz.

[0095] In some embodiments, the transmission band index (iband ) defines two different transmission bandwidths, and i band can be 0 or 1 respectively. Different PBCH DMRS sequences are used to indicate two transmission bandwidths and four SSB indices. In other words, the PBCH DMRS sequence is initialized by a 1-bit transmission band index and a 2-bit SSB index. The PBCH DMRS sequence is defined by the parameters in the following equation: To generate.

[0096]

[0097] In some embodiments, the transmission band index (i band ) defines four different transmission bandwidths, and i band It can be 0, 1, 2 or 3 respectively. Different PBCH DMRS sequences are used to indicate 4 transmission bandwidths and 1 LSB of the SSB index. Therefore, another 1 bit is needed to indicate 1 MSB of the SSB index, which can be the following three bits in the PBCH payload (i.e., ) In other words, the PBCH DMRS sequence is initialized by the 2-bit transmission band index and 1 LSB of the SSB index. The PBCH DMRS sequence is defined by the parameters in the following equation: In some implementations, the 1 MSB of the SSB index can be any bit of ssb-SubcarrierOffset or subCarrierSpacingCommon in the MIB.

[0098]

[0099] Example Set IV

[0100] 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.

[0101] In some embodiments, Fig. 6A As shown, an initial downlink bandwidth part (DL BWP) (620) is defined within the available system bandwidth (610), and the initial DL BWP is less than or equal to the available system bandwidth in the frequency domain.

[0102] In some embodiments, reference Figure 6B, a first bandwidth (630) of a control resource set numbered zero (e.g., CORESET#0) is configured to receive a system information block (SIB1) PDCCH, and a second bandwidth (640) of CORESET#0 is configured to receive a signal other than 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 (e.g., including 24 RBs) may be configured by PBCH. The number of resources occupied by the second bandwidth of CORESET#0 in the frequency domain is the same as that of Figure 6B The initial DL BWP configured by SIB1 is shown to be the same.

[0103] In some implementations, for the CORESET#0 configuration with the first bandwidth, some data may be punctured due to limited channel bandwidth. The UE needs to determine the dedicated spectrum range to detect the PDCCH after puncturing.

[0104] In some implementations, the dedicated spectrum range is determined based on the determined system bandwidth. ssb = 0, which means that the synchronization grid overlaps with the channel grid defined in RAN4, and the frequency position and available RBs of the system bandwidth will be determined to be the same as the SSB bandwidth. ssb ≠0, the frequency position of the system BW will be SS RFF -k ssb , and the available RBs of the system bandwidth will be one more RB than the RBs used for SSB transmission.

[0105] In some implementations, for a PDCCH detected within CORESET#0 having a second bandwidth, the PDCCH candidates are mapped within the second bandwidth of CORESET#0. Figure 7 FIG. 4 shows a second bandwidth (16 RB) of CORESET#0 in the available system bandwidth, showing that a higher aggregation level (eg, AL=8) can be supported on similar limited frequency domain resources. In other words, a higher aggregation level (eg, AL=8) can be supported. Figure 1C The punch scheme shown provides greater coverage.

[0106] In some embodiments, a method for solving problems related to power boosting may be described. Power boosting may be used for PBCH to reduce performance loss due to a reduction in the number of RBs. This may result in inconsistent measurements (e.g., synchronization signal reference signal received power (SS-RSRP)) between values ​​obtained by measuring the PBCH DMRS and values ​​obtained by measuring the SSS during neighboring cell measurements. This problem may be solved by defining an offset of the PBCH DMRS per resource element energy (EPRE) to the SSS EPRE, and notifying the neighboring cell or UEs under the neighboring cell of the offset and the number of RBs.

[0107] In some embodiments, the number of OFDM symbols of CORESET#0 may be extended (eg, extended to 4) to reduce the PDCCH reception performance loss due to the reduction in the number of RBs. This may result in a collision between the PDSCH DMRS and the extended PDCCH.

[0108] Some embodiments for resolving the conflict between PDSCH DMRS and extended PDCCH may include the definition of the time domain symbol position of the extended PDSCH DMRS. For example, it is allowed to map PDSCH DMRS from the fifth symbol and the sixth symbol of the time slot based on time slot scheduling. In other words, for PDSCH mapping type A, DMRS-TypeA-Position=pos4 or DMRS-TypeA-Position=pos5 is allowed.

[0109] Some embodiments for resolving the conflict between PDSCH DMRS and extended PDCCH, wherein the PDSCH DMRS on the fifth OFDM symbol or the sixth OFDM symbol in the time slot conflicts with the DCI information of the extended PDCCH. A method includes mapping the PDSCH DMRS on resources other than the conflict in a rate matching manner to ensure the integrity of the extended PDCCH information.

[0110] Some embodiments for resolving a conflict between a PDSCH DMRS and an extended PDCCH, wherein a PDSCH DMRS on the fifth OFDM symbol or the sixth OFDM symbol in a time slot conflicts with a PDCCH DMRS of an extended PDCCH. A method includes not sending a PDSCH DMRS on 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.

[0111] The present disclosure describes methods, apparatus, and computer-readable media for wireless communications. The present disclosure solves the problem of wireless communications with limited channel bandwidth. The methods, apparatus, and computer-readable media described in the present disclosure can facilitate the performance of wireless transmissions between user equipment and base stations, thereby improving efficiency and overall performance. The methods, apparatus, and computer-readable media described in the present disclosure can improve the overall efficiency of wireless communication systems.

[0112] References to features, advantages, or similar language throughout the specification do not imply that all features and advantages that may be achieved with the present solution should or are included in any single implementation thereof. Rather, language referring to 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 present solution. Thus, discussion of features and advantages and similar language throughout the specification may, but does not necessarily, refer to the same embodiment.

[0113] In addition, the features, advantages, and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. Based on the description herein, one of ordinary skill in the relevant art will recognize that the present solution may be practiced without one or more of the specific features or advantages of a particular embodiment. In other cases, it may be recognized in certain embodiments that additional features and advantages may not be present in all embodiments of the present solution.

Claims

1. A method for wireless communication, comprising: The transmission bandwidth is determined by the user equipment (UE) by receiving a synchronization signal or a physical broadcast channel (SS / PBCH) block (SSB); as well as in: The transmission bandwidth is among a plurality of transmission bandwidths and within a channel bandwidth, and The channel bandwidth is less than a bandwidth threshold.

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

3. The method according to claims 1 to 2, wherein: The UE determines the transmission bandwidth based on receiving SSB in different operating frequency bands, and The different operating frequency bands correspond to specific areas or purposes.

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

5. The method according to claim 4, wherein: The UE determines the transmission bandwidth based on the GSCN by at least one of the following: deriving parameters from the GSCN according to a formula and using the parameters to determine the transmission bandwidth, or A remainder is obtained by the GSCN mod m, and the transmission bandwidth is determined using the remainder, wherein mod is a modular operation and m is an integer equal to or greater than the number of transmission bandwidths under the same channel bandwidth.

6. The method according to any one of claims 1 to 2, wherein: The UE determines the transmission bandwidth based on the frequency position of the SSB by: obtaining a remainder by (f / rf) mod m, wherein f is the frequency position of the SSB, rf is a grid frequency, and m is an integer equal to or greater than the number of transmission bandwidths under the same channel bandwidth; and The transmission bandwidth is determined using the remainder.

7. The method according to claim 6, wherein: The grid frequency corresponds to a fixed synchronous grid frequency of N*100 kHz, where N is a positive integer.

8. The method according to any one of claims 1 to 2, wherein: The UE determines the transmission bandwidth based on the sequence of the PSS in the SSB by: based on the sequence of the PSS, obtaining a cyclic shift for a base sequence corresponding to the sequence of the PSS, deriving an index for the transmission bandwidth based on the cyclic shift for the base sequence, and Based on the index, the transmission bandwidth under the same channel bandwidth is determined.

9. The method according to claim 8, wherein: The sequence of the PSS is one of three different PSS sequences, each of the three different PSS sequences indicating a different transmission bandwidth.

10. The method according to any one of claims 1 to 2, wherein: The UE determines the transmission bandwidth based on the sequence of the SSS in the SSB by: based on the sequence of the SSS, obtaining a cyclic shift for a base sequence corresponding to the sequence of the SSS, deriving an index for the transmission bandwidth based on the cyclic shift for the base sequence, and Based on the index, the transmission bandwidth under the channel bandwidth is determined.

11. The method according to claim 10, wherein: said sequence of said SSS is one of 336 different SSS sequences, The 336 different SSS sequences are classified into Q groups, where Q is an integer equal to or greater than the number of transmission bandwidths under the same channel bandwidth, and The derived index corresponds to a group among the Q groups, and the sequence of the SSS belongs to the group.

12. The method according to any one of claims 1 to 2, wherein: The UE determines the transmission bandwidth based on the sequence of the SSS in the SSB by: Based on the sequence of the SSS, obtaining an interleaving sequence corresponding to the sequence of the SSS, deriving an index for the transmission bandwidth based on the interleaving sequence, and Based on the index, the transmission bandwidth under the channel bandwidth is determined.

13. The method according to claim 12, wherein: The sequence of the SSS is one of two different interleaved SSS sequences, and The two different interleaving sequences are obtained by interleaving two base sequences in different interleaving orders.

14. The method according to any one of claims 1 to 2, wherein: The UE determines the transmission bandwidth based on a sequence of the PBCH DMRS in the SSB by: Based on the sequence of the PBCH DMRS, obtaining a parameter for initializing a scrambling sequence generator corresponding to the sequence of the PBCH DMRS, deriving an index for the transmission bandwidth based on the parameter, and Based on the index, the transmission bandwidth under the channel bandwidth is determined.

15. The method according to claim 14, wherein: The index has one bit, and the one bit represents two transmission bandwidths under the same channel bandwidth; The parameter has three bits, the three bits including one bit of half-frame timing, one bit of the index, and the least significant bit (LSB) of the SSB index; and The most significant bit (MSB) of the SSB index is obtained from: a bit set in the PBCH payload, ssb-SubcarrierOffset or subCarrierSpacingCommon in the master information block (MIB).

16. The method of claim 14, wherein: The index has two bits, and the two bits represent four transmission bandwidths under the same channel bandwidth; The parameter has three bits, the three bits including one bit of half-frame timing and the two bits of the index; and The two bits of the SSB index are obtained from: the bit set in the PBCH payload, ssb-SubcarrierOffset in the MIB, or subCarrierSpacingCommon.

17. The method of claim 14, wherein: The index has one bit, and the one bit represents two transmission bandwidths under the same channel bandwidth; The parameter has three bits, the three bits including one bit of the index and two bits of the SSB index; and One bit of half-frame timing is indicated by the fifth bit in the PBCH payload.

18. The method of claim 14, wherein: The index has two bits, and the two bits represent four transmission bandwidths under the same channel bandwidth; The parameter has three bits, the three bits including the two 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; and The most significant bit (MSB) of the SSB index is obtained from a set of bits in the PBCH payload.

19. A method according to any one of claims 15 to 18, wherein: The set of bits in the PBCH payload includes three bits, and the three bits include a sixth bit, a seventh bit, and an eighth bit in the PBCH payload.

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

21. A computer program product comprising computer readable program medium code stored thereon, which, when executed by a processor, causes the processor to implement the method according to any one of claims 1 to 19.

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