Communication method and device

Abstract

The embodiment of the invention provides a communication method and device, and the method comprises the steps: receiving M synchronization signals (SS) and a physical broadcast channel (PBCH) block, one SS corresponding to one network entity, one PBCH block corresponding to one or more network entities, and M being an integer greater than 1; m SS is detected based on a synchronization signal block pattern, the optimal SS is selected from the M SS for synchronization and the PBCH block is decoded, the synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, the synchronization grid group comprises at least two synchronization grids, and the synchronization grid group comprises at least two synchronization grids. One synchronization grid is used for indicating possible frequency domain positions of SS sent by one or N network entities, and N is an integer greater than 1 and less than or equal to M. By adopting the embodiment of the invention, the synchronous access of the terminal equipment is completed under the condition of scanning the SSB beams of a plurality of network entities, so that the time overhead is reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and device. Background Art

[0002] Reconfigurable intelligent surface (RIS)-assisted networks that control channel characteristics through smart metasurface elements are considered a key enabling technology to expand the coverage of wireless communication networks. RIS can be installed on large flat surfaces (such as walls or ceilings indoors, buildings or signs outdoors) to reflect radio frequency (RF) energy around obstacles and create a virtual line of sight (LoS) propagation path between the communication source and target.

[0003] If the communication system joins RIS, the initial access of the terminal equipment (UE) needs to take into account the synchronization signal and physical broadcast channel block (SSB) beams sent from the RIS side, and the entire access process becomes complicated. When there are multiple RIS in a cell, multiple SSB measurements need to be performed for each RIS, resulting in a large scanning time overhead. Summary of the invention

[0004] An embodiment of the present application provides a communication method and device, which adopts frequency division and / or code division access to achieve synchronous access of terminal devices while scanning SSB beams of multiple network entities, thereby reducing time overhead.

[0005] In a first aspect, an embodiment of the present application provides a communication method, which is applied to a terminal device, or a chip or circuit configured in the terminal device, including:

[0006] receiving M synchronization signals SS and physical broadcast channel PBCH blocks, wherein one SS corresponds to one network entity, one PBCH block corresponds to one or more network entities, and M is an integer greater than 1;

[0007] The M SSs are detected based on a synchronization signal block pattern, and the optimal SS is selected from the M SSs for synchronization and decoding of the PBCH block, wherein the synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, the synchronization grid group includes at least two synchronization grids, and one synchronization grid is used to indicate a possible frequency domain position of one or N SSs sent by the network entity, and N is an integer greater than 1 and less than or equal to M.

[0008] Frequency division and / or code division access is adopted to detect the SS of multiple network entities through the synchronization signal block pattern, so as to achieve synchronous access of terminal devices while scanning the SSB beams of multiple network entities, without indicating the frequency domain position through the PBCH block, thereby reducing communication delay.

[0009] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same;

[0010] If a first SS is detected at a frequency domain position of a first synchronization grid among the M synchronization grids, a second SS is detected at a frequency domain position having the same frequency offset in other synchronization grids among the M synchronization grids except the first synchronization grid, wherein the M SSs include the first SS and the second SS.

[0011] By using a synchronization grid group consisting of multiple synchronization grids with the same frequency domain offset and sending an SS with a fixed frequency domain offset, the terminal device does not need to perform blind detection on each synchronization grid. After detecting one SS, the frequency domain positions of all other SSs can be determined based on the frequency domain offset, thereby reducing the detection and synchronization overhead.

[0012] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different;

[0013] If a first SS is detected at a frequency domain position of a first synchronization grid among the M synchronization grids, a second SS is detected at a frequency domain position of other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0014] By using a synchronization grid group composed of multiple synchronization grids with different frequency domain offsets and sending SSs with non-fixed frequency domain offsets, it is beneficial for network devices to configure frequency domain resources.

[0015] In a possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same;

[0016] If a first SS is detected at a first frequency domain position in a first synchronization grid among the M synchronization grids, a second SS is detected at a second frequency domain position in other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0017] A synchronization grid is used to indicate the possible frequency domain positions of SSs sent by M network entities. The terminal device needs to detect the possible frequency domain positions in each synchronization grid, but can skip the frequency domain positions corresponding to the network entities that have been detected in other synchronization grids and detect the SSs at the frequency domain positions corresponding to the remaining network entities, thereby reducing the detection and synchronization overhead.

[0018] In a possible design, the M network entities share a synchronization grid, the M network entities correspond to M synchronization sequences, and the M synchronization sequences have different types and / or different fields;

[0019] If a first SS is detected at a frequency domain position of the shared synchronization grid, the first SS is detected through M synchronization sequences, and the M SSs include the first SS.

[0020] By using different synchronization sequences at the same frequency domain position to detect different SSs, initial access to different RISs is achieved, thus saving frequency domain resources of the SSs.

[0021] In one possible design, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences are of different types and / or have different fields;

[0022] If a first SS is detected at the frequency domain position of the first synchronization grid among the at least two synchronization grids, the first SS is detected respectively through the at least two synchronization sequences; a second SS is detected at the frequency domain positions of other synchronization grids among the at least two synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0023] By using a synchronization grid group and a synchronization sequence combination to detect the SSs of multiple RISs, frequency domain resources can be saved.

[0024] In one possible design, first indication information is received, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

[0025] In a possible design, the number of synchronization grids included in the synchronization grid group may be implicitly indicated by the synchronization signal block pattern, that is, different synchronization signal block patterns are associated with the number of RIS. For example, when SS appears at the first frequency domain position of the synchronization grid group, it indicates that there is only one RIS; when SS appears at the second frequency domain position of the synchronization grid group, it indicates that there are only two RIS. Alternatively, there is no need to indicate the number of synchronization grids included in the synchronization grid group. The terminal device may detect the synchronization grids in sequence, and stop synchronous access when it is detected that there is no synchronization signal on a synchronization grid.

[0026] In a possible design, the number of frequency domain positions of the M SSs is less than or equal to the number of the network entities. That is, some of the M SSs can be detected at the same frequency domain position. For example, the terminal device can detect SS1, SS2, and SS3 at the same frequency domain position in the shared synchronization grid and detect them through different synchronization sequences.

[0027] In a second aspect, an embodiment of the present application provides a communication method, which is applied to a network device, or a chip or circuit configured in a network device, including:

[0028] Based on the synchronization signal block pattern, M synchronization signals SS and physical broadcast channel PBCH blocks are sent, one SS corresponds to one network entity, and one PBCH block corresponds to one or more network entities. The synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence. The synchronization grid group includes at least two synchronization grids, and one synchronization grid is used to indicate a possible frequency domain position of a SS sent by one or N network entities. M is an integer greater than 1, and N is an integer greater than 1 and less than or equal to M.

[0029] Frequency division and / or code division access is adopted to send the SS of multiple network entities through the synchronization signal block pattern, so as to achieve synchronous access of terminal devices while scanning the SSB beams of multiple network entities, without indicating the frequency domain position through the PBCH block, thereby reducing communication delay.

[0030] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SSs sent by the network device are also the same. The network device may send a first SS at a frequency domain position of a first synchronization grid among the M synchronization grids, and send a second SS at a frequency domain position with the same frequency offset in other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0031] By using a synchronization grid group consisting of multiple synchronization grids with the same frequency domain offset and sending an SS with a fixed frequency domain offset, the terminal device does not need to perform blind detection on each synchronization grid. After detecting one SS, the frequency domain positions of all other SSs can be determined based on the frequency domain offset, thereby reducing the detection and synchronization overhead.

[0032] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different. The network device can send a first SS at the frequency domain position of a first synchronization grid among the M synchronization grids, and send a second SS at the frequency domain positions of other synchronization grids among the M synchronization grids except the first synchronization grid.

[0033] By using a synchronization grid group composed of multiple synchronization grids with different frequency domain offsets and sending SSs with non-fixed frequency domain offsets, it is beneficial for network devices to configure frequency domain resources.

[0034] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same. The network device may send a first SS at a first frequency domain position in a first synchronization grid among the M synchronization grids, and send a second SS at a second frequency domain position in other synchronization grids among the M synchronization grids except the first synchronization grid, wherein the M SSs include the first SS and the second SS.

[0035] A synchronization grid is used to indicate the possible frequency domain positions of SSs sent by M network entities. The terminal device needs to detect the possible frequency domain positions in each synchronization grid, but can skip the frequency domain positions corresponding to the network entities that have been detected in other synchronization grids and detect the SSs at the frequency domain positions corresponding to the remaining network entities, thereby reducing the detection and synchronization overhead.

[0036] In one possible design, M network entities share a synchronization grid, and the M network entities correspond to M synchronization sequences, and the M synchronization sequences are of different types and / or have different fields. The network device can send M synchronization signals at the same frequency domain position of the shared synchronization grid, and send M SSs through the M synchronization sequences.

[0037] By using different synchronization sequences to send different SSs at the same frequency domain position, initial access to different RISs is achieved, thus saving frequency domain resources of the SSs.

[0038] In one possible design, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences are of different types and / or have different fields. The network device may send a first SS at a frequency domain position of a first synchronization grid among the at least two synchronization grids, and send the first SS respectively through the at least two synchronization sequences; and then send a second SS at a frequency domain position of other synchronization grids among the at least two synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0039] By using a synchronization grid group and a synchronization sequence combination to send SSs of multiple RIS, frequency domain resources can be saved.

[0040] In one possible design, first indication information is sent, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

[0041] In a possible design, the number of frequency domain positions of the M SSs is less than or equal to the number of the network entities. That is, some of the M SSs can be sent at the same frequency domain position. For example, the network device can send SS1, SS2, and SS3 at the same frequency domain position in the shared synchronization grid and send them through different synchronization sequences.

[0042] In a third aspect, an embodiment of the present application provides a communication device, including:

[0043] A receiving module, configured to receive M synchronization signals SS and physical broadcast channel PBCH blocks, wherein one SS corresponds to one network entity, one PBCH block corresponds to one or more network entities, and M is an integer greater than 1;

[0044] A processing module is used to detect the M SSs based on a synchronization signal block pattern, select the optimal SS from the M SSs for synchronization and decode the PBCH block, wherein the synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, the synchronization grid group includes at least two synchronization grids, one of the synchronization grids is used to indicate a possible frequency domain position of one or N SSs sent by the network entity, and N is an integer greater than 1 and less than or equal to M.

[0045] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same;

[0046] The processing module is further used to detect a second SS at a frequency domain position with the same frequency offset in other synchronization grids among the M synchronization grids except the first synchronization grid if a first SS is detected at the frequency domain position of the first synchronization grid among the M synchronization grids, and the M SSs include the first SS and the second SS.

[0047] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different;

[0048] The processing module is further configured to detect a second SS at the frequency domain positions of other synchronization grids among the M synchronization grids except the first synchronization grid if a first SS is detected at the frequency domain position of the first synchronization grid among the M synchronization grids, wherein the M SSs include the first SS and the second SS.

[0049] In a possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same;

[0050] The processing module is further configured to detect a second SS at a second frequency domain position in other synchronization grids among the M synchronization grids except the first synchronization grid if a first SS is detected at a first frequency domain position in a first synchronization grid among the M synchronization grids, wherein the M SSs include the first SS and the second SS.

[0051] In a possible design, the M network entities share a synchronization grid, the M network entities correspond to M synchronization sequences, and the M synchronization sequences have different types and / or different fields;

[0052] The processing module is further configured to detect the first SS through M synchronization sequences if a first SS is detected at a frequency domain position of the shared synchronization grid, wherein the M SSs include the first SS.

[0053] In one possible design, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences are of different types and / or have different fields;

[0054] The processing module is further used to detect the first SS respectively through the at least two synchronization sequences if a first SS is detected at the frequency domain position of the first synchronization grid among the at least two synchronization grids; and detect the second SS at the frequency domain positions of other synchronization grids among the at least two synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0055] In one possible design, the receiving module is also used to receive first indication information, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

[0056] In a possible design, the number of frequency domain positions of the M SSs is less than or equal to the number of the network entities.

[0057] The operations and beneficial effects performed by the communication device can refer to the method and beneficial effects described in the first aspect above, and the repeated parts will not be repeated.

[0058] In a fourth aspect, an embodiment of the present application provides a communication device, including:

[0059] A sending module, used to send M synchronization signals SS and physical broadcast channel PBCH blocks based on a synchronization signal block pattern, one SS corresponds to one network entity, one PBCH block corresponds to one or more network entities, the synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, the synchronization grid group includes at least two synchronization grids, one synchronization grid is used to indicate a possible frequency domain position of a SS sent by one or N network entities, M is an integer greater than 1, and N is an integer greater than 1 and less than or equal to M.

[0060] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the corresponding frequency domain positions between the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same.

[0061] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different.

[0062] In one possible design, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the corresponding frequency domain positions between the M synchronization grids are the same.

[0063] In a possible design, M network entities share a synchronization grid, the M network entities correspond to M synchronization sequences, and the M synchronization sequences are of different types and / or different fields.

[0064] In one possible design, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences have different types and / or different fields.

[0065] In one possible design, the sending module is also used to send first indication information, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

[0066] In a possible design, the number of frequency domain positions of the M SSs is less than or equal to the number of the network entities.

[0067] The operations and beneficial effects performed by the communication device can refer to the method and beneficial effects described in the second aspect above, and the repeated parts will not be repeated.

[0068] In a fifth aspect, the present application provides a communication device, comprising a processor and a memory, wherein the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory so that the communication device performs a method as described in any one of the first aspects.

[0069] In a sixth aspect, the present application provides a communication device, comprising a processor and a memory, wherein the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory so that the communication device performs a method as described in any one of the second aspects.

[0070] In the seventh aspect, the present application provides a communication device, which may be a terminal device, or a device in a terminal device, or a device that can be used in combination with a terminal device. Among them, the communication device may also be a chip system. The communication device may execute the method described in the first aspect. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions. The module may be software and / or hardware. The operations and beneficial effects performed by the communication device may refer to the methods and beneficial effects described in the first aspect above, and the repetitive parts will not be repeated.

[0071] In an eighth aspect, the present application provides a communication device, which may be a network device, or a device in a network device, or a device that can be used in combination with a network device. Among them, the communication device may also be a chip system. The communication device may execute the method described in the second aspect. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions. The module may be software and / or hardware. The operations and beneficial effects performed by the communication device may refer to the methods and beneficial effects described in the second aspect above, and the repetitive parts will not be repeated.

[0072] In a ninth aspect, the present application provides a computer-readable storage medium for storing a computer program. When the computer program is executed, the method described in any one of the first aspect and the second aspect is implemented.

[0073] In a tenth aspect, the present application provides a computer program product comprising a computer program, which, when executed, enables the method described in any one of the first and second aspects to be implemented.

[0074] In the eleventh aspect, an embodiment of the present application provides a communication system, which includes at least one terminal device and at least one network device, the terminal device is used to execute the steps in the above-mentioned first aspect, and the network device is used to execute the steps in the above-mentioned second aspect.

[0075] In a twelfth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being used to communicate with an external device or an internal device, and the processor being used to implement the methods in the above aspects.

[0076] In one possible design, the chip may further include a memory, in which a computer program or instruction is stored, and the processor is used to execute the computer program or instruction stored in the memory, or other programs or instructions. When the computer program or instruction is executed, the processor is used to implement the above-mentioned various aspects of the method.

[0077] In one possible design, the chip can be integrated into a terminal device or a network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 It is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application;

[0079] Figure 2 It is a schematic diagram of the working mode of a reflective RIS;

[0080] Figure 3 This is a flow chart of UE initial access;

[0081] Figure 4 It is a schematic diagram of the SSB scanning process of RIS;

[0082] Figure 5 It is a schematic diagram of the SSB scan timing of a single RIS;

[0083] Figure 6 It is a schematic diagram of SSB scanning of multiple RIS;

[0084] Figure 7 This is a schematic diagram of an SSB configuration method;

[0085] Figure 8 It is a schematic diagram of frequency division initial access;

[0086] Fig. 9 It is a flow chart of a communication method provided in an embodiment of the present application;

[0087] Fig.10 is a schematic diagram of a synchronization signal block pattern;

[0088] Fig.11 is a schematic diagram of another synchronization signal block pattern;

[0089] Fig.12 is a schematic diagram of another synchronization signal block pattern;

[0090] Fig.13 is a schematic diagram of another synchronization signal block pattern;

[0091] Fig.14 is a schematic diagram of another synchronization signal block pattern;

[0092] Fig.15 is a structural diagram of a communication device provided in an embodiment of the present application;

[0093] Fig.16 is a structural diagram of another communication device provided in an embodiment of the present application;

[0094] Fig.17 It is a structural diagram of a terminal device provided in an embodiment of the present application;

[0095] Fig.18 It is a structural diagram of a network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0096] like Figure 1 As shown, Figure 1It is an architectural diagram of a communication system provided in an embodiment of the present application. The communication system may include a network device, a terminal device, and a network entity. Among them, the network device may include a main base station and a slave base station, and the coverage of the service cell (carrier) of one or more slave base stations is located within the coverage of the main base station. The terminal device may be located within the coverage of one or more service cells provided by the network device. When there are multiple cells providing services for the terminal device, the terminal device may operate in accordance with carrier aggregation (CA), dual connectivity (DC), or coordinated multi-point transmission, wherein one or more service cells provide at least one parameter set (numerology) and provide wireless resources for the terminal device at the same time.

[0097] The terminal device may be referred to as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., and refers to a device that provides voice and / or data connectivity to the user. For example, a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminals are: mobile phones, tablet computers, laptops, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc. The following descriptions are all based on the terminal device as UE.

[0098] Network equipment refers to the radio access network (RAN) node (or device) that connects terminal devices to the wireless network, which can also be called a base station. A base station can include a baseband unit (BBU) and a remote radio unit (RRU). BBU and RRU can be placed in different places, for example: RRU is remote and placed in an area with high traffic volume, and BBU is placed in a central computer room. BBU and RRU can also be placed in the same computer room. BBU and RRU can also be different components under the same rack. At present, some examples of RAN nodes are: evolved Node B (gNB), transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), base band unit (BBU), or wireless fidelity (Wifi) access point (AP), etc. In addition, in a network structure, the network device may include a centralized unit (CU) node, a distributed unit (DU) node, or a RAN device including a CU node and a DU node. Among them, the RAN equipment including CU nodes and DU nodes splits the protocol layer of eNB in ​​the long term evolution (LTE) system, puts some functions of the protocol layer under central control of the CU, and distributes the remaining part or all of the functions of the protocol layer in the DU, which is centrally controlled by the CU.

[0099] The network entity may include a reconfigurable intelligent surface (RIS), a satellite or an Internet of Things (IoT) device. The beam sent by the network device passes through the network entity to reach the terminal device, or the beam sent by the terminal device passes through the network entity to reach the network device.

[0100] The wireless communication systems mentioned in the scheme of the present invention include but are not limited to: narrowband Internet of Things system (NB-IoT), global system for mobile communications (GSM), enhanced data rate for GSM evolution system (EDGE), wideband code division multiple access system (WCDMA), code division multiple access 2000 system (CDMA2000), time division-synchronization code division multiple access system (TD-SCDMA), long term evolution system (LTE) and three major application scenarios of the next generation 5G mobile communication system: enhanced mobile broadbande (MBB), ultra reliable low latency communication (URLLC) and enhanced machine type communication (eMTC).

[0101] like Figure 2 As shown, Figure 2 This is a schematic diagram of how a reflective RIS works. Since the direct link between the UE and the base station is blocked by an obstacle, the signal sent by the UE can be reflected by the RIS to reach the base station. The RIS can be installed on a large plane (such as a wall or ceiling indoors, a building or sign outdoors) to reflect RF energy around obstacles and create a virtual LoS propagation path between the communication source and target.

[0102] In the future 6G scenario, in order to obtain higher array gain, a larger RIS array can be considered, such as a RIS consisting of 1024 or more arrays. In order to obtain more precise phase control, the current RIS architecture is generally considered to have a phase shifter behind each array. Since the operation of the phase shifter requires power consumption, the power consumption and cost of the RIS are very important issues in such an architecture.

[0103] like Figure 3 As shown, Figure 3This is a flow chart of UE initial access. It includes the following steps:

[0104] S301, the base station broadcasts SSB and remaining minimum system information (RMSI), wherein SSB includes primary synchronization signal (PSS), secondary synchronization signal (SSS) and PBCH.

[0105] S302, the UE detects the SS and decodes the PBCH block to obtain timing information, where the timing information includes the index of the SSB.

[0106] S303, the UE obtains RMSI information, and obtains random access channel (RACH) configuration information, uplink and downlink initial bandwidth part (BWP) configuration, and physical uplink control channel (PUCCH) configuration information from the RMSI.

[0107] Specifically, the UE can obtain the frequency domain position of the RMSI and the frequency domain position of the physical downlink control channel (PDCCH) control resource set (CORESET) according to the content in the master information block (MIB). Based on the frequency domain position, the UE can obtain the RMSI information, and obtain the RACH configuration information, the uplink and downlink initial BWP configuration, and the PUCCH configuration information from the RMSI.

[0108] S304, the UE sends a RACH preamble at a corresponding RACH occasion.

[0109] S305, the base station receives a physical random access channel (PRACH), obtains the index of the SSB, and sends the corresponding beam.

[0110] Finally, the UE and the base station complete the initial access.

[0111] If the communication system joins RIS, the initial access of the UE needs to take into account the SSB beam sent from the RIS side, and the entire access process will become more complicated. Figure 4 As shown, Figure 4 This is a schematic diagram of the SSB scanning process of RIS. In the case of a single RIS scan, the base station can periodically send an SSB beam, which reaches the UE after being reflected by the RIS, and the UE determines the service beam through beam scanning.

[0112] like Figure 5 As shown, Figure 5 This is a schematic diagram of the SSB scanning sequence of a single RIS. The base station periodically sends an SSB beam, and the UE periodically scans the SSB beam reflected by the RIS. Figure 6 As shown, Figure 6 This is a schematic diagram of SSB scanning of multiple RIS. If there are multiple SSB beams of RIS, the SSB beam sent by the base station reaches the UE after being reflected by multiple RIS, and the UE scans multiple SSB beams. In this case, the beam scanning time will be longer.

[0113] In order to solve the above technical problems, the embodiments of the present application provide, for example, the following solutions.

[0114] like Figure 7 As shown, Figure 7 It is a schematic diagram of an SSB configuration method. For the cell access process with multiple RIS, the entire SSB access process can be divided into mandatory SSB (mandatory SSB) and auxiliary SSB (secondarySSB). The mandatory SSB can be continuously sent at the same frequency domain position, and the secondary SSB corresponding to different RIS can be sent at different multiple frequency domain positions. Among them, the secondary SSB is used for the initial access of the RIS-assisted UE. For the secondary SSB measurement process, the synchronization signal block pattern (SS block pattern) is predefined. The SS block pattern can be determined by a synchronization raster group (synchronization raster group) and / or a synchronization sequence, and is used for the UE to synchronize access with the signals of multiple RIS, without the need for indication through PBCH, thereby reducing latency.

[0115] Among them, mandatory SSB can be considered as the SSB for initial access of existing NR, which is used for initial access between gNB, UE and RIS. Secondary SSB is the SSB for initial access between gNB and UE through RIS. Through two stages of SSB, UEs that can directly access gNB and those that cannot directly access gNB can perform initial access separately. In this way, the accessed UE can perform data transmission first, reducing the latency of the entire system.

[0116] Maintaining time and frequency synchronization between the UE and the base station is a prerequisite for the mutual transmission of data between the two. The UE completes time and frequency synchronization by detecting the synchronization signal sent by the base station. Synchronization signals are mainly divided into two categories: primary synchronization signal (PSS), which the UE searches for at a given carrier frequency for periodic synchronization. Secondary synchronization signal (SSS), once the UE detects the PSS, it knows the sending timing of the SSS, and the PCI can be obtained by detecting the SSS. In wireless communications, the correlation synchronization method is often used for time synchronization. The synchronization sequences used for time synchronization may include: maximum-length sequence (M sequence), Gold sequence, and Zadoff-Chu sequence.

[0117] The synchronization grid group may be predefined by the protocol. The synchronization grid group may include multiple synchronization grids. The synchronization grid group refers to a limited number of possible frequency domain positions of SSB (composed of PSS, SSS and physical broadcast channel PBCH blocks) in each frequency band. Each synchronization grid in the synchronization grid group corresponds to one or more RIS. The synchronization grid refers to a limited number of possible frequency domain positions of SSB in each frequency band.

[0118] The 3rd generation partnership project (3GPP) numbers the center frequency points of all possible SSBs in the entire new radio (NR) spectrum, which are called global synchronization channel numbers (GSCN). The UE detects the PSS at the GSCN frequency point on the synchronization grid. After detecting the PSS, it can further detect the SSS. The GSCN parameters of the frequency domain grid are shown in Table 1.

[0119] Table 1

[0120]

[0121] like Figure 8 As shown, Figure 8It is a schematic diagram of frequency-divided initial access. Mandatory SSB is used for the existing initial access process. Multiple RISs are configured with multiple synchronization grids, and each synchronization grid corresponds to one RIS. During the duration of secondary SSB, gNB continuously sends a fixed SSB beam to the corresponding RIS on the corresponding frequency domain resources for different RISs, and different RISs perform SSB scanning on different frequency domain resources. The UE performs detection and synchronization on different synchronization grids, that is, after detecting an SS on one synchronization grid, it detects another SS on the next synchronization grid to ensure that the UE can detect an SS with better channel quality for access. During the mandatory SSB duration, UEs that have not performed initial access perform initial access through secondary SSB. Compared with the time-divided access scheme, the UE needs to perform synchronous access at multiple possible frequency domain positions of SSB.

[0122] The following describes in detail the process of initial access through secondary SSB.

[0123] like Fig. 9 As shown, Fig. 9 1 is a flow chart of a communication method provided in an embodiment of the present application. The communication method may mainly include the following steps:

[0124] S901, the network device sends M synchronization signals SS and physical broadcast channel PBCH blocks based on the synchronization signal block pattern, one SS corresponds to one network entity, one PBCH block corresponds to one or more network entities, the synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, the synchronization grid group includes at least two synchronization grids, one synchronization grid is used to indicate a possible frequency domain position of a SS sent by one or N network entities, M is an integer greater than 1, and N is an integer greater than 1 and less than or equal to M.

[0125] Specifically, the network device can broadcast M synchronization signals SS and PBCH blocks to the terminal device through the network entity based on the synchronization signal block pattern. For multiple PBCH blocks with the same content, they can be configured in one PBCH block. Among them, the synchronization signal block pattern can include the following optional methods:

[0126] In a first optional manner, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same. Specifically, the network device may send a first SS at a frequency domain position of a first synchronization grid among the M synchronization grids, and send a second SS at a frequency domain position with the same frequency offset in other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0127] like Fig.10 As shown, Fig.10 It is a schematic diagram of a synchronization signal block pattern. The synchronization signal block pattern includes a synchronization grid group, and the synchronization grid group includes three synchronization grids. Synchronization grid 1 corresponds to RIS1, synchronization grid 2 corresponds to RIS2, and synchronization grid 3 corresponds to RIS3. Synchronization grid 1 includes possible frequency positions f1 and f2 of SS sent by RIS1, synchronization grid 2 includes possible frequency positions f3 and f4 of SS sent by RIS2, and synchronization grid 3 includes possible frequency positions f5 and f6 of SS sent by RIS3. The frequency offsets between frequency positions f1, f3, and f5 are the same, and the frequency offsets between frequency positions f2, f4, and f6 are also the same. The frequency offsets between frequency positions f1, f3, and f5 are also the same as the frequency offsets between frequency positions f2, f4, and f6. The network device may send SS1 of RIS1 at frequency position f1 in synchronization grid 1, send SS2 of RIS2 at frequency position f3 in synchronization grid 2, and send SS3 of RIS3 at frequency position f5 in synchronization grid 3. Since the frequency offsets between frequency positions f1, f3, and f5 are the same, the frequency domain offsets of the SSs sent by the network device are also the same.

[0128] In a second optional manner, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different. Specifically. The network device may send a first SS at the frequency domain position of a first synchronization grid among the M synchronization grids, and send a second SS at the frequency domain positions of other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0129] like Fig.11 As shown, Fig.11It is a schematic diagram of another synchronization signal block pattern. The synchronization signal block pattern includes a synchronization grid group, and the synchronization grid group includes three synchronization grids. The synchronization grid 1 corresponds to RIS1, the synchronization grid 2 corresponds to RIS2, and the synchronization grid 3 corresponds to RIS3. The synchronization grid 1 includes the possible frequency position f1 and frequency position f2 of the SS sent by RIS1, the synchronization grid 2 includes the possible frequency position f3 and frequency position f4 of the SS sent by RIS2, and the synchronization grid 3 includes the possible frequency position f5 and frequency position f6 of the SS sent by RIS3. The frequency offsets between the frequency positions f1, f3 and f5 are different, and the frequency offsets between the frequency positions f2, f4 and f6 are also different. The frequency offsets between the frequency positions f1, f3 and f5 are also different from the frequency offsets between the frequency positions f2, f4 and f6. The network device may send SS1 of RIS1 at frequency position f1 or frequency position f2 in synchronization grid 1, send SS2 of RIS2 at frequency position f3 or frequency position f4 in synchronization grid 2, and send SS3 of RIS3 at frequency position f5 or frequency position f6 in synchronization grid 3. Since the frequency offsets between the various frequency positions are different, the frequency domain offsets of the SSs sent by the network device are also different.

[0130] A third optional manner, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same. Alternatively, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different. The number of synchronization grids included in the synchronization grid group is the same as the number of network entities. Specifically, the network device may send a first SS at a first frequency domain position in a first synchronization grid among the M synchronization grids, and send a second SS at a second frequency domain position in other synchronization grids among the M synchronization grids except the first synchronization grid, wherein the M SSs include the first SS and the second SS. The M network entities include a first network entity and a second network entity. The first frequency domain position may be the frequency domain position of the SS corresponding to the first network entity, and the second frequency domain position may be the frequency domain position of the SS corresponding to the second network entity.

[0131] like Fig.12 As shown, Fig.12It is a schematic diagram of another synchronization signal block pattern. The synchronization signal block pattern includes a synchronization grid group, the synchronization grid group includes 3 synchronization grids, synchronization grid 1 includes possible frequency position f1 of SS sent by RIS1, possible frequency position f2 of SS sent by RIS2 and possible frequency position f3 of SS sent by RIS3, synchronization grid 2 includes possible frequency position f4 of SS sent by RIS1, possible frequency position f5 of SS sent by RIS2 and possible frequency position f6 of SS sent by RIS3, synchronization grid 3 includes possible frequency position f7 of SS sent by RIS1, possible frequency position f8 of SS sent by RIS2 and possible frequency position f9 of SS sent by RIS3. Among them, the frequency offsets between frequency position f1, frequency position f4 and frequency position f7 are the same, the frequency offsets between frequency position f2, frequency position f5 and frequency position f8 are also the same, and the frequency offsets between frequency position f3, frequency position f6 and frequency position f9 are also the same. The network device may send SS1 of RIS1 at frequency position f2 in synchronization grid 1, send SS2 of RIS2 at frequency position f4 in synchronization grid 2, and send SS3 of RIS3 at frequency position f9 in synchronization grid 3. Alternatively, SS1 of RIS1 may be sent at frequency position f1 in synchronization grid 1, SS2 of RIS2 may be sent at frequency position f5 in synchronization grid 2, and SS3 of RIS3 may be sent at frequency position f9 in synchronization grid 3. The network device may also send SS1, SS2, and SS3 respectively in other ways.

[0132] The fourth optional method is that M of the network entities share one synchronization grid, and the M network entities correspond to M synchronization sequences, and the M synchronization sequences have different types and / or different fields. Among them, the types of synchronization sequences may include ZC sequences, golden sequences, and M sequences. The fields of the synchronization sequence may be different root sequences of the same synchronization sequence, such as a root sequence with an index of 1 in the ZC sequence and a root sequence with an index of 2 in the ZC sequence. Specifically, the network device may send M synchronization signals at the same frequency domain position of the shared synchronization grid, and send M SSs through the M synchronization sequences.

[0133] like Fig.13 As shown, Fig.13 It is a schematic diagram of another synchronization signal block pattern. The synchronization signal block pattern includes a synchronization grid and a synchronization sequence. RIS1, RIS2 and RIS3 share a synchronization grid, that is, the network device can send SS1, SS2 and SS3 at the same frequency domain position (for example, frequency domain position f1) of the synchronization grid. Since the frequency domain positions of sending SS1, SS2 and SS3 are the same, M synchronization sequences are used to send SS1, SS2 and SS3. There are 3 options:

[0134] Option 1: Multiple RISs use different types of synchronization sequences: RIS1's SS1 is sent using the ZC sequence, RIS2's SS2 is sent using the golden sequence, and RIS3's SS3 is sent using the M sequence.

[0135] Option 2: Multiple RISs use different root sequences of the same type of synchronization sequence: use the root sequence with index 1 in the ZC sequence to send SS1 of RIS1, use the root sequence with index 2 in the ZC sequence to send SS2 of RIS2, and use the root sequence with index 3 in the ZC sequence to send SS3 of RIS3.

[0136] Option 3: Multiple RISs use a combination of different types of sequences and different root sequences: SS1 of RIS1 is sent using the root sequence with index 1 in the ZC sequence, SS2 of RIS2 is sent using the root sequence with index 2 in the ZC sequence, and SS3 of RIS3 is sent using the golden sequence.

[0137] A fifth optional manner, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences are of different types and / or have different fields. Specifically, the network device may send a first SS at a frequency domain position of a first synchronization grid among the at least two synchronization grids, and send the first SS respectively through the at least two synchronization sequences; and then send a second SS at a frequency domain position of other synchronization grids among the at least two synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0138] like Fig.14 As shown, Fig.14It is a schematic diagram of another synchronization signal block pattern. The synchronization signal block pattern includes a synchronization grid group and a synchronization sequence, and the synchronization grid group includes synchronization grid 1 and synchronization grid 2. RIS1 and RIS2 share synchronization grid 1, RIS1 corresponds to the ZC sequence, and RIS2 corresponds to the golden sequence. RIS3 and RIS4 share synchronization grid 2, RIS3 corresponds to the ZC sequence, and RIS4 corresponds to the golden sequence. The network device can send SS1 and SS2 at the frequency domain position f1 of synchronization grid 1, and use the ZC sequence to send SS1 of RIS1, and use the golden sequence to send SS2 of RIS2. The network device can send SS3 and SS4 at the frequency domain position f3 of synchronization grid 2, and use the ZC sequence to send SS3 of RIS3, and use the golden sequence to send SS4 of RIS4. Among them, the synchronization sequences corresponding to SS1 and SS3 are the same, but the frequency domain positions are different, and the synchronization sequences corresponding to SS2 and SS4 are the same, but the frequency domain positions are different.

[0139] Optionally, the network device may send first indication information to the terminal device, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group. The first indication information may be included in a system message, such as a MIB message.

[0140] Optionally, the number of synchronization grids included in the synchronization grid group can be implicitly indicated by the synchronization signal block pattern, that is, different synchronization signal block patterns are associated with the number of RIS. For example, when SS appears in the first frequency domain position of the synchronization grid group, it means that there is only one RIS; when SS appears in the second frequency domain position of the synchronization grid group, it means that there are only two RIS. Alternatively, there is no need to indicate the number of synchronization grids included in the synchronization grid group. The terminal device can detect the synchronization grids in turn, and stop synchronous access when it is detected that there is no synchronization signal on a synchronization grid.

[0141] The number of frequency domain positions of the M SSs is less than or equal to the number of the network entities. That is, some of the M SSs can be sent at the same frequency domain position. For example, the network device can send SS1, SS2 and SS3 at the same frequency domain position in the shared synchronization grid, and send them separately through different synchronization sequences.

[0142] Optionally, before sending M synchronization signals SS and physical broadcast channel PBCH blocks (secondary SSB), the network device may broadcast a mandatory SSB to the terminal device. The PBCH block in the mandatory SSB may include second indication information, and the second indication information may be used to indicate the frequency domain position of the SS sent by the network entity. The terminal device may detect the SS in the secondary SSB sent by the network device at the frequency domain position of the SS indicated by the second indication information.

[0143] Optionally, if some terminal devices fail to detect the mandatory SSB, the access of these terminal devices fails, indicating that there are terminal devices that have not performed initial access. The network device can send a secondary SSB, and these terminal devices that have not performed initial access can perform initial access through the secondary SSB.

[0144] S902, the terminal device detects the M SSs based on the synchronization signal block pattern, selects the best SS from the M SSs to synchronize and decode the PBCH block.

[0145] Specifically, the terminal device detects the M SSs based on the synchronization signal block pattern to obtain M SSs, selects the best SS from the M SSs, determines the frequency domain position of the PBCH block through the best SS, decodes the PBCH block at the frequency domain position of the PBCH block, obtains the control information in the PBCH block and completes the initial access. Detecting the M SSs based on the synchronization signal block pattern may include the following optional methods:

[0146] In a first optional manner, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same. If the terminal device detects the first SS at the frequency domain position of the first synchronization grid among the M synchronization grids, the second SS is detected at the frequency domain position with the same frequency offset in other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS. By using a synchronization grid group composed of multiple synchronization grids with the same frequency domain offset and sending an SS with a fixed frequency domain offset, the terminal device does not need to perform blind detection on each synchronization grid. After detecting one SS, the frequency domain positions of all other SSs can be determined according to the frequency domain offset, thereby reducing the detection and synchronization overhead.

[0147] For example, Fig.10As shown, if the terminal device detects SS1 at frequency position f1 in synchronization grid 1, the terminal device can detect SS2 at frequency position f3 in synchronization grid 2 and detect SS3 at frequency position f5 in synchronization grid 3. The frequency domain position of SS2 and the frequency domain position of SS3 are related to the frequency domain position of SS1.

[0148] In a second optional manner, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different. If a first SS is detected at the frequency domain position of the first synchronization grid among the M synchronization grids, a second SS is detected at the frequency domain positions of other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS. A synchronization grid group composed of multiple synchronization grids with different frequency domain offsets and sending SSs with non-fixed frequency domain offsets is conducive to the configuration of frequency domain resources by network devices.

[0149] For example, Fig.11 As shown, if the network device detects SS1 at frequency position f1 in synchronization grid 1, the network device can detect SS2 at frequency position f3 or frequency position f4 in synchronization grid 2, and detect SS3 at frequency position f5 or frequency position f6 in synchronization grid 3. The frequency domain position of SS2 and the frequency domain position of SS3 are independent of the frequency domain position of SS1.

[0150] A third optional manner is that the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same; or, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different. If a first SS is detected at a first frequency domain position in a first synchronization grid among the M synchronization grids, a second SS is detected at a second frequency domain position in other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS. The possible frequency domain positions of the SSs sent by M network entities are indicated by one synchronization grid, and the terminal device needs to detect the possible frequency domain positions in each synchronization grid, but can skip the frequency domain positions corresponding to the network entities that have been detected in other synchronization grids, and detect the SSs at the frequency domain positions corresponding to the remaining network entities, thereby reducing the detection and synchronization overhead.

[0151] For example, Fig.12As shown, if the terminal device detects SS1 at frequency position f2 in synchronization grid 1, the terminal device can jump to synchronization grid 2 and detect SS2 or SS3 at frequency position f4 or frequency position f6 of synchronization grid 2 without continuing to detect in synchronization grid 1 or detecting at frequency position f5 of synchronization grid 2.

[0152] In a fourth optional manner, M network entities share a synchronization grid, and the M network entities correspond to M synchronization sequences, and the M synchronization sequences have different types and / or different fields. If a first SS is detected at a frequency domain position of the shared synchronization grid, the first SS is detected by the M synchronization sequences, and the first SS may be part or all of the M SSs. By using different synchronization sequences to detect SSs at the same frequency domain position, different RISs are initially accessed, thereby saving frequency domain resources of the SS.

[0153] For example, Fig.13 As shown, if the terminal device detects SS1, SS2 and SS3 at the same frequency domain position (for example, frequency domain position f1) of the synchronization grid, the terminal device can use the root sequence with an index of 1 in the ZC sequence to detect SS1 of RIS1, use the root sequence with an index of 2 in the ZC sequence to detect SS2 of RIS2, and use the root sequence with an index of 3 in the ZC sequence to detect SS3 of RIS3.

[0154] A fifth optional manner, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences have different types and / or different fields. If a first SS is detected at a frequency domain position of a first synchronization grid among the at least two synchronization grids, the first SS is detected respectively by the at least two synchronization sequences, and a second SS is detected at a frequency domain position of other synchronization grids except the first synchronization grid among the at least two synchronization grids. Among them, the first SS is part or all of the SSs among the at least two SSs corresponding to the at least two synchronization grids. The second SS is the other SS among the M SSs except the at least two SSs corresponding to the at least two synchronization grids. The M SSs include the first SS and the second SS. By using a combination of a synchronization grid group and a synchronization sequence to detect the SSs of multiple RISs, frequency domain resources can be saved.

[0155] For example, Fig.14As shown, if the terminal device detects SS1 and SS2 at the frequency domain position f1 of synchronization grid 1, the terminal device can use the ZC sequence to detect SS1 corresponding to RIS1 and use the golden sequence to detect SS2 of RIS2. Then, jump to the frequency domain position f3 or frequency domain position f4 of synchronization grid 2 to continue detection. If the terminal device detects SS3 and SS4 at the frequency domain position f3 of synchronization grid 2, the terminal device can use the ZC sequence to detect SS3 of RIS3 and use the golden sequence to detect SS4 of RIS4.

[0156] In an embodiment of the present application, a frequency division and / or code division access method is adopted to detect the SS of multiple network entities through a synchronization signal block pattern, so as to achieve synchronous access of the terminal device while scanning the SSB beams of multiple network entities, without indicating the frequency domain position through the PBCH block, thereby reducing the communication delay.

[0157] It can be understood that in the above-mentioned method embodiments, the methods and operations implemented by the terminal device can also be implemented by components that can be used for the terminal device (such as chips or circuits), and the methods and operations implemented by the network device can also be implemented by components that can be used for the network device (such as chips or circuits).

[0158] The embodiment of the present application can divide the functional modules of the terminal device or network device according to the above method example. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. The following is an example of using each functional module divided according to each function to illustrate.

[0159] Above, combined Fig. 9 The method provided by the embodiment of the present application is described in detail. Figure 15 to Figure 16 The communication device provided in the embodiment of the present application is described in detail. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, so the contents not described in detail can be referred to the method embodiment above, and will not be repeated here for the sake of brevity.

[0160] See also Fig.15 , Fig.15 15 is a schematic diagram of a communication device provided in an embodiment of the present application. The communication device may include a receiving module 1501 and a processing module 1502.

[0161] The communication device can implement the steps or processes executed by the terminal device in the above method embodiment, for example, it can be a terminal device, or a chip or circuit configured in the terminal device. The receiving module 1501 is used to perform the sending and receiving related operations on the terminal device side in the above method embodiment, and the processing module 1502 is used to perform the processing related operations of the terminal device in the above method embodiment.

[0162] The receiving module 1501 is configured to receive M synchronization signals SS and physical broadcast channel PBCH blocks, where one SS corresponds to one network entity, one PBCH block corresponds to one or more network entities, and M is an integer greater than 1;

[0163] The processing module 1502 is used to detect the M SSs based on the synchronization signal block pattern, select the optimal SS from the M SSs for synchronization and decode the PBCH block, wherein the synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, the synchronization grid group includes at least two synchronization grids, one of the synchronization grids is used to indicate a possible frequency domain position of one or N SSs sent by the network entity, and N is an integer greater than 1 and less than or equal to M.

[0164] Optionally, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same;

[0165] The processing module 1502 is also used to detect a second SS at a frequency domain position with the same frequency offset in other synchronization grids among the M synchronization grids except the first synchronization grid if a first SS is detected at the frequency domain position of the first synchronization grid among the M synchronization grids, and the M SSs include the first SS and the second SS.

[0166] Optionally, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different;

[0167] The processing module 1502 is further used to detect a second SS at the frequency domain position of other synchronization grids among the M synchronization grids except the first synchronization grid if a first SS is detected at the frequency domain position of the first synchronization grid among the M synchronization grids, and the M SSs include the first SS and the second SS.

[0168] Optionally, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same;

[0169] The processing module 1502 is also used to detect a second SS at a second frequency domain position in other synchronization grids among the M synchronization grids except the first synchronization grid if a first SS is detected at a first frequency domain position in the first synchronization grid among the M synchronization grids, and the M SSs include the first SS and the second SS.

[0170] Optionally, M network entities share one synchronization grid, the M network entities correspond to M synchronization sequences, and the M synchronization sequences have different types and / or different fields;

[0171] The processing module 1502 is further configured to detect the first SS through M synchronization sequences if a first SS is detected at a frequency domain position of the shared synchronization grid, wherein the M SSs include the first SS.

[0172] Optionally, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences have different types and / or different fields;

[0173] The processing module 1502 is also used to detect the first SS respectively through the at least two synchronization sequences if a first SS is detected at the frequency domain position of the first synchronization grid among the at least two synchronization grids; and detect the second SS at the frequency domain positions of other synchronization grids among the at least two synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

[0174] Optionally, the receiving module 1501 is further used to receive first indication information, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

[0175] Optionally, the number of frequency domain positions of the M SSs is less than or equal to the number of the network entities.

[0176] It should be noted that the implementation of each module can also refer to Fig. 9 The corresponding description of the method embodiment shown executes the method and functions performed by the terminal device in the above embodiment.

[0177] See also Fig.16 , Fig.16 16 is a schematic diagram of a communication device provided in an embodiment of the present application. The communication device may include a sending module 1601.

[0178] The communication device can implement the steps or processes executed by the network device in the above method embodiment, for example, it can be a network device, or a chip or circuit configured in the network device. The sending module 1601 is used to perform the sending and receiving related operations on the network device side in the above method embodiment.

[0179] The sending module 1601 is used to send M synchronization signals SS and physical broadcast channel PBCH blocks based on the synchronization signal block pattern, one SS corresponds to one network entity, and one PBCH block corresponds to one or more network entities. The synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, and the synchronization grid group includes at least two synchronization grids. One synchronization grid is used to indicate a possible frequency domain position of a SS sent by one or N network entities. M is an integer greater than 1, and N is an integer greater than 1 and less than or equal to M.

[0180] Optionally, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same.

[0181] Optionally, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different.

[0182] Optionally, the synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same.

[0183] In a possible design, M network entities share a synchronization grid, the M network entities correspond to M synchronization sequences, and the M synchronization sequences are of different types and / or different fields.

[0184] Optionally, the synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences are of different types and / or different fields.

[0185] Optionally, the sending module 1601 is further used to send first indication information, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

[0186] Optionally, the number of frequency domain positions of the M SSs is less than or equal to the number of the network entities.

[0187] It should be noted that the implementation of each module can also refer to Fig. 9 The corresponding description of the method embodiment shown executes the method and functions performed by the network device in the above embodiment.

[0188] Fig.17 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application. The terminal device can be applied to Figure 1 In the system shown, the functions of the terminal device in the above method embodiment are executed, or the steps or processes executed by the terminal device in the above method embodiment are realized.

[0189] like Fig.17 As shown, the terminal device includes a processor 1701 and a transceiver 1702. Optionally, the terminal device also includes a memory 1703. The processor 1701, the transceiver 1702 and the memory 1703 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 1703 is used to store a computer program, and the processor 1701 is used to call and run the computer program from the memory 1703 to control the transceiver 1702 to send and receive signals. Optionally, the terminal device may also include an antenna for sending the uplink data or uplink control signaling output by the transceiver 1702 through a wireless signal.

[0190] The processor 1701 and the memory 1703 may be combined into a processing device, and the processor 1701 is used to execute the program code stored in the memory 1703 to implement the above functions. In specific implementation, the memory 1703 may also be integrated into the processor 1701, or independent of the processor 1701. Fig.15 Corresponding to the processing module in.

[0191] The transceiver 1702 can be used with Fig.15 The receiving module in FIG. 1702 may also be referred to as a transceiver unit or a transceiver module. The transceiver 1702 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0192] It should be understood that Fig.17 The terminal equipment shown is capable of implementing Fig. 9 The method embodiment shown involves various processes of the terminal device. The operations and / or functions of each module in the terminal device are respectively to implement the corresponding processes in the above method embodiment. For details, please refer to the description in the above method embodiment. To avoid repetition, the detailed description is appropriately omitted here.

[0193] The processor 1701 can be used to execute the actions implemented by the terminal device in the previous method embodiment, and the transceiver 1702 can be used to execute the actions of the terminal device sending to or receiving from the terminal device described in the previous method embodiment. Please refer to the description in the previous method embodiment for details, which will not be repeated here.

[0194] Among them, the processor 1701 can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the contents disclosed in this application. The processor 1701 can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The communication bus 1704 can be a peripheral component interconnect standard PCI bus or an extended industrial standard structure EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.17 Only one thick line is used to represent it, but it does not mean that there is only one bus or one type of bus. The communication bus 1704 is used to realize the connection and communication between these components. Among them, the transceiver 1702 in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 1703 may include volatile memory, such as nonvolatile dynamic random access memory (NVRAM), phase change random access memory (PRAM), magnetoresistive random access memory (MRAM), etc., and may also include non-volatile memory, such as at least one disk storage device, electrically erasable programmable read-only memory (EEPROM), flash memory devices, such as NOR flash memory or NAND flash memory, semiconductor devices, such as solid state disk (SSD), etc. The memory 1703 may also be at least one storage device located away from the aforementioned processor 1701. The memory 1703 may optionally store a set of computer program codes or configuration information. Optionally, the processor 1701 may also execute a program stored in the memory 1703. The processor may cooperate with the memory and the transceiver to execute any method and function of the terminal device in the above-mentioned application embodiment.

[0195] Fig.18is a schematic diagram of the structure of a network device provided in an embodiment of the present application. The network device can be applied to Figure 1 In the system shown, the functions of the network device in the above method embodiment are executed, or the steps or processes executed by the network device in the above method embodiment are realized.

[0196] like Fig.18 As shown, the network device includes a processor 1801 and a transceiver 1802. Optionally, the network device also includes a memory 1803. The processor 1801, the transceiver 1802 and the memory 1803 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 1803 is used to store a computer program, and the processor 1801 is used to call and run the computer program from the memory 1803 to control the transceiver 1802 to send and receive signals. Optionally, the network device may also include an antenna for sending the uplink data or uplink control signaling output by the transceiver 1802 through a wireless signal.

[0197] The processor 1801 and the memory 1803 may be combined into a processing device, and the processor 1801 is used to execute the program code stored in the memory 1803 to implement the above functions. In specific implementation, the memory 1803 may also be integrated into the processor 1801, or independent of the processor 1801.

[0198] The transceiver 1802 can be used with Fig.16 The transceiver 1802 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0199] It should be understood that Fig.18 The network equipment shown can achieve Fig. 9 The method embodiment shown involves various processes of the network device. The operations and / or functions of each module in the network device are respectively to implement the corresponding processes in the above method embodiment. For details, please refer to the description in the above method embodiment. To avoid repetition, the detailed description is appropriately omitted here.

[0200] The processor 1801 can be used to execute the actions implemented by the network device in the previous method embodiment, and the transceiver 1802 can be used to execute the actions of the terminal device sending to or receiving from the network device described in the previous method embodiment. Please refer to the description in the previous method embodiment for details, which will not be repeated here.

[0201] The processor 1801 may be any of the above mentioned processors. The communication bus 1804 may be a PCI bus or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.18 Only one thick line is used to represent it, but it does not mean that there is only one bus or one type of bus. The communication bus 1804 is used to realize the connection and communication between these components. Among them, the transceiver 1802 of the device in the embodiment of the present application is used to communicate signaling or data with other devices. The memory 1803 can be the various types of memory mentioned above. The memory 1803 can also be at least one storage device located away from the aforementioned processor 1801. A group of computer program codes or configuration information are stored in the memory 1803, and the processor 1801 executes the program in the memory 1803. The processor can cooperate with the memory and the transceiver to execute any one of the methods and functions of the network device in the above-mentioned application embodiment.

[0202] An embodiment of the present application also provides a chip system, which includes a processor for supporting a terminal device or a network device to implement the functions involved in any of the above embodiments, such as generating or processing a synchronization signal involved in the above method.

[0203] In one possible design, the chip system may also include a memory, which is used for computer programs and data necessary for the terminal device or network device. The chip system may be composed of a chip, or may include a chip and other discrete devices. The input and output of the chip system correspond to the receiving and sending operations of the terminal device or network device in the method embodiment, respectively.

[0204] According to the method provided in the embodiment of the present application, the present application also provides a computer program product, the computer program product comprising: a computer program, when the computer program is run on a computer, causes the computer to execute Fig. 9 A method according to any one of the embodiments shown.

[0205] According to the method provided in the embodiment of the present application, the present application also provides a computer-readable medium, which stores a computer program, and when the computer program is run on a computer, the computer executes Fig. 9 A method according to any one of the embodiments shown.

[0206] According to the method provided in the embodiment of the present application, the present application also provides a communication system, which includes one or more terminal devices and one or more network devices as mentioned above.

[0207] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disc (SSD)).

[0208] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: The method comprises: receiving M synchronization signals SS and physical broadcast channel PBCH blocks, wherein one SS corresponds to one network entity, one PBCH block corresponds to one or more network entities, and M is an integer greater than 1; The M SSs are detected based on a synchronization signal block pattern, and an optimal SS is selected from the M SSs for synchronization and decoding of the PBCH block, wherein the synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence, the synchronization grid group includes at least two synchronization grids, and one synchronization grid is used to indicate a possible frequency domain position of one or N SSs sent by the network entity, and N is an integer greater than 1 and less than or equal to M.

2. The method according to claim 1, characterized in that The synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SS sent by the network device are also the same; The detecting the M SSs based on the synchronization signal block pattern comprises: If a first SS is detected at a frequency domain position of a first synchronization grid among the M synchronization grids, a second SS is detected at a frequency domain position having the same frequency offset in other synchronization grids among the M synchronization grids except the first synchronization grid, wherein the M SSs include the first SS and the second SS.

3. The method according to claim 1, characterized in that The synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different; The detecting the M SSs based on the synchronization signal block pattern comprises: If a first SS is detected at a frequency domain position of a first synchronization grid among the M synchronization grids, a second SS is detected at a frequency domain position of other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

4. The method according to claim 1, characterized in that The synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same; The detecting the M SSs based on the synchronization signal block pattern comprises: If a first SS is detected at a first frequency domain position in a first synchronization grid among the M synchronization grids, a second SS is detected at a second frequency domain position in other synchronization grids among the M synchronization grids except the first synchronization grid, and the M SSs include the first SS and the second SS.

5. The method according to claim 1, characterized in that The M network entities share a synchronization grid, the M network entities correspond to M synchronization sequences, and the M synchronization sequences have different types and / or different fields; The detecting the M SSs based on the synchronization signal block pattern comprises: If a first SS is detected at a frequency domain position of the shared synchronization grid, the first SS is detected through M synchronization sequences, and the M SSs include the first SS.

6. The method according to claim 1, characterized in that The synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences are of different types and / or have different fields; The detecting the M SSs based on the synchronization signal block pattern comprises: If a first SS is detected at a frequency domain position of a first synchronization grid among the at least two synchronization grids, detecting the first SS respectively through the at least two synchronization sequences; A second SS is detected at a frequency domain position of other synchronization grids except the first synchronization grid among the at least two synchronization grids, and the M SSs include the first SS and the second SS.

7. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: First indication information is received, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

8. The method according to any one of claims 1 to 7, characterized in that: The number of frequency domain positions of the M SSs is less than or equal to the number of the network entities.

9. A communication method, characterized in that: The method comprises: Based on the synchronization signal block pattern, M synchronization signals SS and physical broadcast channel PBCH blocks are sent, one SS corresponds to one network entity, and one PBCH block corresponds to one or more network entities. The synchronization signal block pattern is determined by a synchronization grid group and / or a synchronization sequence. The synchronization grid group includes at least two synchronization grids, and one synchronization grid is used to indicate a possible frequency domain position of a SS sent by one or N network entities. M is an integer greater than 1, and N is an integer greater than 1 and less than or equal to M.

10. The method according to claim 9, characterized in that The synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same, and the frequency domain offsets of the SSs sent by the network devices are also the same.

11. The method according to claim 9, characterized in that The synchronization grid group includes M synchronization grids, one synchronization grid corresponds to one network entity, the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are different, and the frequency domain offsets of the SS sent by the network device are also different.

12. The method according to claim 9, characterized in that The synchronization grid group includes M synchronization grids, one synchronization grid corresponds to M network entities, and the frequency offsets of the frequency domain positions corresponding to the M synchronization grids are the same.

13. The method according to claim 9, characterized in that The M network entities share one synchronization grid, the M network entities correspond to M synchronization sequences, and the M synchronization sequences have different types and / or different fields.

14. The method according to claim 9, characterized in that The synchronization grid group includes at least two synchronization grids, at least two network entities among the M network entities share one synchronization grid, the at least two network entities correspond to at least two synchronization sequences, and the at least two synchronization sequences have different types and / or different fields.

15. The method according to any one of claims 9 to 14, characterized in that: The method further comprises: Sending first indication information, where the first indication information is used to indicate the number of synchronization grids included in the synchronization grid group.

16. The method according to any one of claims 9 to 15, characterized in that: The number of frequency domain positions of the M SSs is less than or equal to the number of the network entities.

17. A communication device, characterized in that: The communication device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the communication device to perform the method according to any one of claims 1 to 8.

18. A communication device, characterized in that: The device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the communication device to perform the method according to any one of claims 9 to 16.

19. A computer-readable storage medium, characterized in that: The computer-readable storage medium comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 16 is implemented.

20. A chip, characterized in that: The chip includes a processor and a communication interface, wherein the communication interface is used to communicate with an external device or an internal device, and the processor is used to implement the method according to any one of claims 1-16.

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