WO2023142837A1 - Method for receiving synchronization signal and pbch block, and communication apparatus - Google Patents

Abstract

Provided in the embodiments of the present application are a method for receiving a synchronization signal and PBCH block, and a communication apparatus. The method comprises: in one MIB period, a narrowband terminal device receiving N SSB parts on frequency domain resources that are not completely the same, and according to the difference in PBCH data in N SSB parts that are represented in a first differential pattern, merging the PBCH data in the received N SSB parts onto any one of the N SSB parts. Compared with one instance of SSB reception, the narrowband terminal device can acquire information that is carried on more different frequency domain resources, thereby improving the SSB receiving performance of the narrowband terminal device.

Description

Method and communication device for receiving synchronization signal block

This application claims priority to a Chinese patent application with application number 202210092594.8 and titled "Method and Communication Device for Receiving Synchronization Signal Blocks" filed with the State Intellectual Property Office of China on January 26, 2022, the entire contents of which are incorporated by reference in this application.

technical field

The embodiments of the present application relate to the communication field, and more specifically, relate to a method and a communication device for receiving a synchronization signal block.

Background technique

In order to reduce the manufacturing cost of some low-cost terminal equipment, an effective implementation is to reduce the maximum bandwidth capability of the terminal equipment. It is very likely that terminal equipment with a maximum bandwidth capability of 5MHz or less will be introduced into the new radio (NR) system in the future. For ease of description, these terminal devices with specific lower bandwidth capabilities may be referred to as narrowband terminal devices.

The physical broadcasting channel (PBCH) of the synchronization signal and PBCH block (SSB) carries the necessary information for the terminal device to access the network. Therefore, the reception of the SSB is very important for the terminal device to access the network. . However, as the maximum bandwidth capability of the narrowband terminal device further decreases, the narrowband terminal device can only receive part of the data of the SSB without any processing, resulting in poor reception performance or even reception failure of the SSB. Therefore, how to improve the SSB receiving performance of the narrowband terminal equipment has become an urgent problem to be solved.

Contents of the invention

Embodiments of the present application provide a method for receiving a synchronization signal block and a communication device, which can improve the SSB receiving performance of a narrowband terminal device.

In the first aspect, a communication method is provided, and the method may be executed by a terminal device, or may also be executed by a component (such as a chip or a circuit) of the terminal device, which is not limited. For the convenience of description, the following uses terminal Device execution is taken as an example for description.

The method may include: the terminal device receives N synchronization signal block SSB parts within one MIB period, and the frequency domain resources occupied by the N SSB parts do not completely overlap, wherein the maximum bandwidth capability of the terminal device is less than the bandwidth of one SSB , N is an integer greater than or equal to 2; the terminal device combines the N SSB parts according to the first differential pattern to obtain the first SSB, and the first differential pattern is used to represent the PBCH modulation and coding of the N complete SSBs corresponding to the N SSB parts Bit difference; the terminal device acquires system information according to the first SSB.

It should be understood that the PBCH modulation and coding bits are the data obtained by encoding and then modulating the bit stream to be sent in the PBCH by the network equipment. Each complete SSB contains 864 bits of PBCH modulation and coding bits, wherein 864 bits of PBCH modulation and coding bits Each bit takes the value +1 or -1.

After the network device determines the PBCH modulation and coding of the SSB to be sent, it also needs to send the PBCH modulation and coding bits of the SSB to be sent to the terminal device through the antenna. Due to noise and fading in the channel, the terminal device receives the SSB There may be some changes in the data of each bit in the 864-bit PBCH modulation coding bits. For example, +1 becomes +0.98 and -1 becomes -0.95.

In order to distinguish whether the PBCH modulation and coding bits are the PBCH modulation and coding bits to be sent by the network equipment or the PBCH modulation and coding bits received by the terminal equipment, the 864-bit PBCH modulation and coding bits of the SSB to be sent by the network equipment are referred to as the first SSB in this application. For the PBCH data, the 864-bit PBCH modulation and coding bits of the SSB received by the terminal device are referred to as the second PBCH data of the SSB.

It should also be understood that the difference in the PBCH modulation and coding bits of the N complete SSBs corresponding to the N SSB parts represents the difference in the first PBCH data in the N SSB parts, that is, the first PBCH data in the N SSB parts are the same at the same position or different. For example, the difference of the first PBCH data in the 2 SSB parts means that the data on the X bit of the first PBCH data of the 2 SSBs are the same or different, wherein the same means that the first PBCH data of the 2 SSBs are on the X bit Both are +1 or -1, different means that the first PBCH data of the two SSBs is +1 on the X bit, and the other is -1, 1≤X≤864.

In the above technical solution, the narrowband terminal device receives SSBs at different frequency domain positions multiple times, and according to the difference of the first PBCH data in the N SSB parts represented by the first difference pattern, the received N SSB parts The second PBCH data in the N SSB parts are merged into any SSB part in the N SSB parts. Compared with one SSB reception, the narrowband terminal device can obtain more information carried on different frequency domain resources, which improves the SSB reception of the narrowband terminal device. performance.

It should be understood that when the frequency domain resources occupied by N SSB parts are the same as the frequency domain resources occupied by any complete SSB in one MIB period, the narrowband terminal equipment can also receive SSB.

With reference to the first aspect, in some implementations of the first aspect, the first differential pattern belongs to a first differential pattern set, the first differential pattern set includes multiple differential patterns, and the multiple differential patterns are different from each other, wherein the differential The pattern is the result of splicing the system frame number SFN bits of any two adjacent SSBs among the N SSBs after the XOR operation, or the difference pattern is the SFN bit of any SSB among the N SSBs and the remaining N-1 The result obtained by splicing after the SFN bit XOR operation of each SSB in the SSB, the first differential pattern set contains the differential pattern corresponding to any N SSBs, and the difference between the SFN between any N SSBs and the N SSBs The difference of SFN between parts satisfies the same relationship, where the SFN bit is the 10-bit binary number of SFN.

It should be noted that the difference between the PBCH modulation and coding bits of any two SSBs can be uniquely determined by the difference between the SFN bits of the two SSBs. Therefore, in the above technical solution, a possible specific implementation of the first differential pattern is given Way.

As an example, the first differential pattern is a splicing result obtained after exclusive OR operation of SFN bits of any two adjacently received SSB parts among the N SSB parts. For example, N=3, the SFN bits of the 3 SSB parts received by the terminal equipment are respectively SFN bit #1, SFN bit #2 and SFN bit #3, then the first differential pattern is ((SFN bit #1 XOR SFN bit #2) & (SFN bit #2 XOR SFN bit #3)).

As an example, the first differential pattern is a splicing result obtained by XOR operation of the SFN bits of any SSB part in the N SSB parts and the SFN bits of each of the remaining N-1 SSB parts. For example, N=3, the SFN bits of the 3 SSB parts received by the terminal equipment are respectively SFN bit #1, SFN bit #2 and SFN bit #3, with SFN bit #3 as the anchor point, then the first differential pattern is ( (SFN bit #1 XOR SFN bit #3) & (SFN bit #2 XOR SFN bit #3)).

With reference to the first aspect, in some implementation manners of the first aspect, the terminal device combines the N SSB parts according to the first differential pattern to obtain the first SSB, including: the terminal device determines the second differential pattern according to the first differential pattern, The bit dimension of the second differential pattern is (N-1)*X, where X is the number of PBCH modulation and coding bits in one SSB; the terminal device combines the N SSB parts according to the second differential pattern to obtain the first SSB.

It should be noted that in this application, the symbol * represents multiplication. For example, 3*6 means multiplying 3 and 6.

As an example, N=3, the SFN bits of the SSB#1 part, SSB#2 part and SSB#3 part received by the terminal equipment are respectively SFN bit #1, SFN bit #2 and SFN bit #3, according to the adjacent difference method The first differential pattern corresponding to the three SSB parts is ((SFN bit #1 exclusive OR SFN bit #2) & (SFN bit #2 exclusive OR SFN bit #3)), then the terminal device can obtain A determined second differential pattern, the bit dimension of the second differential pattern is 2*864 bits, wherein the first 864 bits of the second differential pattern are determined according to the result of (SFN bit #1 XOR SFN bit #2), Indicates the difference between the first PBCH data of SSB#1 and SSB#2, and the last 864 bits of the second differential pattern are determined according to the result of (SFN bit #2 XOR SFN bit #3), indicating SSB#2 and SSB# 3 differences of the first PBCH data. In this way, the terminal device first selects two SSB parts to merge, and then merges with the remaining SSB part to obtain data after the three SSB parts are merged.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device selects the first differential pattern from the first differential pattern set, and the selection order of the first differential pattern is random, or, the first differential pattern The selection order of a differential pattern is determined according to the matching probability of the first differential pattern.

In the above technical solution, the random selection method can omit the process of storing or generating the matching probability of each differential pattern by the terminal device, thereby reducing the memory usage. The matching probability selection method provides a faster way to find the correct differential pattern, reduces the number of combined attempts of the terminal, and improves the SSB receiving efficiency of the narrowband terminal equipment.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device loads the locally stored first differential pattern set, or the terminal device calculates and generates the first differential pattern set.

In the above technical solution, loading the locally stored differential pattern set can enable the terminal device to use the local differential pattern set to determine the correct differential pattern after booting, avoiding taking up time for the terminal device to perform other operations.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device determines that the first SSB passes the cyclic redundancy check (CRC) check.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device acquires first information, and the first information includes the first set of differential patterns and the information corresponding to each differential pattern in the first set of differential patterns All starting SFNs: the terminal device determines the first differential pattern from the first differential pattern set, where all the starting SFNs corresponding to the first differential pattern include the SFN of the first SSB received within one MIB period.

In the above technical solution, when the terminal device knows the SFNs of the N SSB parts, it can directly look up the table to obtain the differential patterns corresponding to the current N SSB parts, and can find the correct combination of the N SSB parts at one time. The differential pattern improves the SSB receiving efficiency of the narrowband terminal equipment.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device acquires second information, the second information includes the first differential pattern set, and each differential pattern in the first differential pattern set corresponds to The matching probability and the smallest two SFNs among all the starting SFNs corresponding to each differential pattern; the terminal device determines all the starting SFNs corresponding to each differential pattern according to the second information; the terminal device determines the first SFN from the first differential pattern set The differential pattern, wherein all the starting SFNs corresponding to the first differential pattern include the SFN of the first SSB received in one MIB period.

In the above technical solution, when the terminal equipment knows the SFNs of N SSB parts, it can also find the correct difference pattern once by indirect table lookup, and only storing the three numbers of matching probability and initial SFN can also save the cost of the narrowband UE. storage.

In a second aspect, a communication device is provided, and the device is configured to execute the method provided in the first aspect above. Specifically, the apparatus may include a unit and/or module, such as a processing unit and/or a communication unit, for performing the first aspect and the method in any possible implementation manner of the first aspect.

In an implementation manner, the apparatus is a terminal device. When the device is a terminal device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In another implementation manner, the apparatus is a chip, a chip system, or a circuit used in a terminal device. When the device is a chip, chip system or circuit used in terminal equipment, the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit etc.; the processing unit may be at least one processor, processing circuit or logic circuit and the like.

In a third aspect, a communication device is provided, the device includes: including at least one processor, at least one processor is coupled with at least one memory, at least one memory is used to store computer programs or instructions, and at least one processor is used to read from at least one memory The computer program or instruction is invoked and executed in the communication device, so that the communication device executes the method in the first aspect and any possible implementation manner of the first aspect.

In an implementation manner, the apparatus is a terminal device.

In another implementation manner, the apparatus is a chip, a chip system, or a circuit used in a terminal device.

In a fourth aspect, the present application provides a processor configured to execute the method in the first aspect and any possible implementation manner of the first aspect.

For the sending and obtaining/receiving operations involved in the processor, if there is no special description, or if it does not conflict with its actual function or internal logic in the relevant description, it can be understood as the processor's output and reception, input and other operations , can also be understood as the sending and receiving operations performed by the radio frequency circuit and the antenna, which is not limited in this application.

In a fifth aspect, there is provided a computer-readable storage medium, where the computer-readable storage medium stores program code for execution by a device, and the program code includes a method for performing the above-mentioned first aspect and any possible implementation manner of the first aspect method in .

In a sixth aspect, a computer program product including instructions is provided, and when the computer program product is run on a computer, the computer is made to execute the method in the above-mentioned first aspect and any possible implementation manner of the first aspect.

In a seventh aspect, a chip is provided, and the chip includes a processor and a communication interface, and the processor reads instructions stored in the memory through the communication interface, and executes the method in the above-mentioned first aspect and any possible implementation manner of the first aspect.

Optionally, as an implementation, the chip further includes a memory, in which computer programs or instructions are stored, and the processor is used to execute the computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, the processor is used to execute The above first aspect and the method in any possible implementation manner of the first aspect.

According to an eighth aspect, a communication system is provided, and the communication system includes network equipment and the communication apparatus shown in the third aspect, where the network equipment may include access network equipment and/or core network equipment.

Description of drawings

FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application.

FIG. 2 is a schematic diagram of a time-frequency structure of an SSB.

Fig. 3 is a schematic flowchart of PBCH and MIB encoding processing and resource mapping.

Fig. 4 is a schematic diagram of receiving SSB by a narrowband terminal device.

Fig. 5 is a schematic flow chart of a method for receiving a synchronization signal block proposed by the present application.

FIG. 6 is a schematic diagram of frequency hopping reception of two SSBs by a narrowband terminal device.

Fig. 7 is a schematic block diagram of a communication device 1000 provided in this application.

FIG. 8 is a schematic structural diagram of a communication device 10 provided by the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the present application can be applied to various communication systems, for example, the fifth generation (5th generation, 5G), NR, long term evolution (long term evolution, LTE), Internet of things (internet of things, IoT), wireless Fidelity (wireless-fidelity, WiFi), 3rd generation partnership project (3rd generation partnership project, 3GPP) related wireless communication, or other wireless communication that may appear in the future, etc.

The technical solutions provided by this application can also be applied to machine type communication (MTC), device-to-device (D2D) networks, machine-to-machine (M2M) networks, and Internet of Things (Internet of Things) networks. of things, IoT) network or other networks.

Referring to FIG. 1, FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application. The communication system includes at least one network device, such as the network device 110 shown in FIG. 1 ; the communication system 100 may further include at least one terminal device, such as the terminal device 120 and/or the terminal device 130 shown in FIG. 1 . The network device 110 and the terminal device 120/130 can communicate through a wireless link, and then exchange information. It can be understood that network devices and terminal devices may also be referred to as communication devices.

A network device is a network-side device with a wireless transceiver function. The network device may be a device that provides a wireless communication function for a terminal device in a radio access network (radio access network, RAN), and is called a RAN device. For example, the network device may be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a next generation base station (next generation NodeB, gNB) in a 5G mobile communication system, a base station in the subsequent evolution of 3GPP, a sending and receiving point ( transmission reception point, TRP), access nodes in WiFi system, wireless relay nodes, wireless backhaul nodes, etc. In communication systems using different radio access technologies (radio access technology, RAT), the names of devices with base station functions may be different. For example, it may be called eNB or eNodeB in the LTE system, and it may be called gNB in the 5G system or NR system, and the specific name of the base station is not limited in this application. A network device may contain one or more co-sited or non-co-sited sending and receiving points. For another example, the network device may include one or more centralized units (central unit, CU), one or more distributed units (distributed unit, DU), or one or more CUs and one or more DUs. In the embodiment of the present application, the device for implementing the function of the network device may be the network device itself, or a device capable of supporting the network device to realize the function, such as a chip system or a combined device or component that can realize the function of the access network device, The device can be installed in network equipment. In the embodiment of the present application, the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.

A terminal device is a user-side device with a wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device built into the above-mentioned devices (such as a communication module , modem, or chip system, etc.). Terminal devices are used to connect people, things, machines, etc., and can be widely used in various scenarios, such as: cellular communication, device-to-device (D2D) communication, V2X communication, machine-to-machine/machine class Communication (machine-to-machine/machine-type communications, M2M/MTC) communication, Internet of Things, virtual reality (virtual reality, VR), augmented reality (augmented reality, AR), industrial control (industrial control), driverless (self driving), remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, drones, robots and other scenarios. Exemplarily, the terminal device may be a handheld terminal in cellular communication, a communication device in D2D, an IoT device in MTC, a monitoring camera in smart transportation and smart city, or a communication device on a drone, etc. Terminal equipment may sometimes be referred to as user equipment (UE), user terminal, user device, subscriber unit, subscriber station, terminal, access terminal, access station, UE station, remote station, mobile device, or wireless communication device, etc. wait. In the embodiment of the present application, the device used to realize the function of the terminal device may be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system or a combined device or component that can realize the function of the terminal device. Can be installed in terminal equipment. For convenience of description, a terminal device is used as an example in this application for description.

In order to facilitate the understanding of the technical solution of the present application, a brief introduction is given to the relevant concepts involved in the embodiments of the application.

1. SSB: It consists of three parts: primary synchronization signals (PSS), secondary synchronization signals (SSS), and PBCH. Among them, the primary and secondary synchronization signals are used for: (1) downlink synchronization of terminal equipment, including clock synchronization, frame synchronization and symbol synchronization; (2) obtaining cell identities (1008 unique physical layer cell identities). PBCH is used to carry the master information block (master information block, MIB), and then obtain the necessary information for users to access the network, such as: system frame number (system frame number, SFN), system information block 1 (system information block 1, SIB1 ) the subcarrier spacing used, the time-frequency resource of SIB1, the indication information of UE camping, etc. It is stipulated in the agreement that for the initial cell selection, the terminal device can assume that the half frame including the SSB occurs at a period of 2 frames (ie 20 ms).

FIG. 2 is a schematic diagram of a time-frequency structure of an SSB. As shown in Figure 2, an SSB occupies a total of 4 orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and a total of 240 subcarriers (that is, 20 resource blocks (RB, RB) in the frequency domain. )), wherein, PSS occupies one symbol, SSS occupies one symbol, PBCH occupies three symbols and one of them is shared with SSS.

It can be seen from FIG. 2 that the bandwidth occupied by the PBCH in the frequency domain is the same as that of the SSB. Therefore, the bandwidth of the SSB in this application can also be understood as the bandwidth of the PBCH.

2. SFN: In the wireless communication system, the time domain can be divided into multiple wireless frames (frames), each wireless frame is 10ms long, and each wireless frame corresponds to a SFN. According to the constraints of the NR SSB protocol, the value range of the SFN It is 0 to 1023, that is, the SFN circulates in the order from 0 to 1023 in the time domain.

3. SFN bit: The SFN bit is the binary number of the SFN value, occupying 10 bits in total. For example, if the SFN is 2, the SFN bits of the SFN are 0000000010.

4. Information carried by the PBCH: the MIB message carried by the PBCH includes the upper 6 bits of the SFN bit, and the physical layer payload (payload) includes the lower 4 bits of the SFN bit, totaling 10 bits. As shown in Figure 3, the 32-bit bit stream of MIB plus payload is scrambled by a 24-bit cyclic redundancy check (CRC) sequence to generate a 56-bit bit stream at the sending end, and then polarized code encoding and rate matching to obtain the encoded 432-bit bit stream, and finally undergo quadrature phase shift keying (quadrature phase shift keying, QPSK) modulation to obtain 864-bit PBCH modulation coded bits, and send them through one or more antenna ports go out.

It should be understood that within a MIB change period of 80ms, assuming that the terminal device detects SSBs at a period of 20ms, it can receive at most 4 SSBs as shown in Figure 3, and the PBCH modulation and coding bits contained in each of the 4 SSBs are in The 32-bit bit stream before modulation and encoding is the same except for the 10-bit SFN bit.

It should also be understood that the PBCH modulation and coding bits are 864-bit data obtained by encoding and then modulating the 56-bit bit stream to be sent, and each SSB contains an 864-bit PBCH modulation and coding bits, wherein the 864 PBCH modulation and coding bits Each bit takes the value +1 or -1.

After the network device determines the PBCH modulation and coding of the SSB to be sent, it also needs to send the 864-bit PBCH modulation and coding bits of the SSB to be sent to the terminal device through the antenna. Due to noise and fading in the channel, the terminal device receives The data of each bit in the 864-bit PBCH modulation coding bits of the SSB may have some changes. For example, +1 becomes +0.98 and -1 becomes -0.95.

In order to distinguish whether the PBCH modulation and coding bits are the PBCH modulation and coding bits to be sent by the network equipment or the PBCH modulation and coding bits received by the terminal equipment, in this application, the 864-bit PBCH modulation and coding bits of the SSB generated by the network equipment are referred to as the first PBCH of the SSB For the data, the 864-bit PBCH modulation and coding bits of the SSB received by the terminal device are referred to as the second PBCH data of the SSB.

It can be known from the above that the PBCH of the SSB carries the necessary information for the terminal equipment to access the network, therefore, the reception of the SSB is very important for the terminal equipment to access the network. However, due to the limitation of the maximum bandwidth capability of the narrowband UE, it cannot completely receive one SSB. As an example, the maximum bandwidth of a narrowband UE is 5 MHz as an example. As shown in Figure 4, it can be seen that within a single SSB transmission cycle, a narrowband UE is limited by its own Receives about half of the data of a complete SSB (20 RBs). Compared with other large-bandwidth UEs receiving a complete SSB, the demodulation threshold will become higher, resulting in very obvious performance loss, which seriously affects the communication quality and efficiency of terminal equipment. .

In view of this, the present application proposes a method that can effectively solve the above technical problems. The method proposed in this application will be described in detail below.

As shown in FIG. 5 , FIG. 5 is a schematic flowchart of a method for receiving a synchronization signal block proposed by the present application.

S501. The terminal device receives N SSB parts within one MIB cycle, and the frequency domain resources occupied by the N SSB parts do not completely overlap, wherein the maximum bandwidth capability of the terminal device is less than the bandwidth of one SSB, and N is an integer greater than or equal to 2 .

It should be understood that within a MIB change period, the terminal device detects the SSB at a fixed period, but it cannot guarantee that the SSB can be received in each period. As an example, there are 8 frames included in a MIB change period of 80ms, the SFNs corresponding to the 8 frames are 0-7, and the SSB detection period is 20ms, then the terminal device can Detect whether there is an SSB sent by the network device, that is, the terminal device can receive the SSB in one or more frames with SFN 0, 2, 4, and 6. For example, the terminal device may receive SSB in frames with SFN 0, 2, 4, and 6, or it may receive SSB only in frames with SFN 0, 4, and 6, or it may only receive SSB in frames with SFN 6 The SSB is received in , and no more examples will be given here.

It should also be understood that the part of N SSBs means that each SSB in the N complete SSBs is completely received in the time domain, and the received SSB data is partially received in the frequency domain.

It should also be understood that the union of the frequency domain resources occupied by the N SSB parts received by the terminal device may be the same as the frequency domain resource occupied by one SSB in one MIB change period, or it may be one SSB in one MIB change period The portion of the frequency domain resource occupied by , is not limited in this application.

Wherein, the terminal device receives N SSB parts in one MIB cycle, and the frequency domain resources occupied by the N SSB parts do not completely overlap. It can also be understood that the terminal device receives N SSB parts corresponding to N SSB parts in one MIB cycle a complete SSB. Among them, frequency hopping reception is a technology for receiving data on different frequency domain resources at different times.

In order to facilitate understanding of S501, the frequency hopping reception of N SSBs by the terminal device is described here with reference to FIG. 6 . Taking N=2 as an example, SSB#1 and SSB#2 are two complete SSBs within one MIB cycle. Since the maximum bandwidth capability of the terminal device is smaller than the bandwidth of the SSB, the terminal device first receives SSB# on the first frequency domain resource. Part of the data of 1 (here called SSB#1 part, the part framed in the dotted line box on the left), and then receive part of the data of SSB#2 on the second frequency domain resource (here called SSB#2 part, the right dotted line box The part out of the box), that is to say, through two receptions, the frequency domain resources occupied by the two SSBs received by the terminal device can be the same as the frequency domain resources occupied by any complete SSB in one MIB period (hereinafter Referred to as complete reception of SSB in the frequency domain). As an example, the first frequency domain resource and the second frequency domain resource may overlap, or the lowest frequency domain position of the first frequency domain resource coincides with the highest frequency domain position of the second frequency domain resource.

It should be noted that the number of times N required by the terminal device to completely receive the SSB in the frequency domain within one MIB cycle needs to be determined according to actual conditions. For example, when the terminal device is relatively close to the network device and the coverage is good, the terminal device may only need to perform two combinations to achieve complete reception in the frequency domain. When the terminal device is far away from the network device and the coverage is slightly poor, the terminal device may need to combine three times or even four times to achieve complete reception in the frequency domain.

It can be understood that in this step, since the frequency domain resources occupied by the N SSBs obtained by receiving N SSBs are not completely overlapped, the data obtained by receiving SSBs only once will be more, in order to obtain more decoded data, it is necessary to combine the received N SSB parts. However, it can be seen from Figure 3 that since the first PBCH data of N complete SSBs corresponding to N SSB parts have different SFN bits contained in the 32-bit stream before encoding and modulation, if the terminal device directly performs N times received PBCH Combining modulation and encoding bits will introduce a large amount of noise data, which will lead to a sharp deterioration in decoding performance. Therefore, this embodiment provides a possible merging manner in S502.

S502. The terminal device combines the N SSB parts according to the first difference pattern to obtain the first SSB. The first difference pattern is used to represent the difference of the PBCH modulation coding bits in the N complete SSBs corresponding to the N SSB parts.

Wherein, the difference of PBCH modulation and coding bits in N complete SSBs can be understood as the difference of each bit in the first PBCH data of N complete SSBs.

It can be understood that the difference in the PBCH modulation and coding bits of the N complete SSBs corresponding to the N SSB parts represents the difference in the first PBCH data in the N SSB parts, that is, the first PBCH data in the N SSB parts are the same or different in the same position . For example, the difference of the first PBCH data in the 2 SSB parts means that the data on the X bit of the first PBCH data of the 2 SSBs are the same or different, wherein the same means that the first PBCH data of the 2 SSBs are on the X bit Both are +1 or -1, different means that the first PBCH data of the two SSBs is +1 on the X bit, and the other is -1, 1≤X≤864.

To facilitate the understanding of the merging process of N SSB parts, it is temporarily assumed here that the terminal device is a non-initial access terminal device that has achieved frame synchronization, that is, the terminal device knows the SFN of the received SSB.

It should be understood that, since the PBCH data of any two complete SSBs in one MIB cycle has only the SFN bits different in the 32 bits before modulation, and the terminal equipment knows which bit positions of the two SFN bits are different, therefore, two complete SSBs Which positions of the corresponding first PBCH data have different data are known and uniquely determined by the terminal device. Therefore, the difference of the SFN bits corresponding to the 2 SSBs can be used to represent the difference of the first PBCH data of the 2 complete SSBs corresponding to the 2 SSB parts. Therefore, the first differential pattern can be understood as the difference of SFN bits of N SSB parts.

A specific method for determining the first differential pattern is given below.

(1) The terminal device determines the SFN bits for each of the N SSB parts.

As an example, if the terminal device receives a part of data of an SSB (ie, the SSB part) on a frame with an SFN of 2, the SFN bits of the SSB part are 0000000010.

(2) The terminal device may use any one of the following two methods to determine the first difference pattern.

The first method: the first differential pattern is the result obtained by concatenating the SFN bits of any two adjacently received SSB parts among the N SSB parts after the exclusive OR operation, which is hereinafter referred to as the "adjacent differential method". For example, N=3, the SFN bits of the 3 SSB parts received by the terminal equipment are respectively SFN bit #1, SFN bit #2 and SFN bit #3, then the first differential pattern is ((SFN bit #1 XOR SFN bit #2) & (SFN bit #2 XOR SFN bit #3)).

The second way: the first differential pattern is the result obtained by splicing the SFN bit of any SSB part in the N SSB parts and the SFN bit of each of the remaining N-1 SSB parts after the XOR operation, as follows It is referred to as "anchor point difference method" in this paper. For example, N=3, the SFN bits of the 3 SSB parts received by the terminal equipment are respectively SFN bit #1, SFN bit #2 and SFN bit #3, with SFN bit #3 as the anchor point, then the first differential pattern is ( (SFN bit #1 XOR SFN bit #3) & (SFN bit #2 XOR SFN bit #3)).

The following example illustrates how to combine N SSB parts according to the first differential pattern to obtain the first SSB.

Taking Figure 6 as an example, the terminal device receives two SSB#1 parts and SSB#2 parts, the frequency domain resources occupied by the SSB#1 part and the SSB#2 part do not overlap, and the SSB is completely received in the frequency domain twice, The SFNs of the two SSBs are 0 and 2 respectively, and the converted 10-bit binary numbers are 0000000000 and 0000000010, respectively, so the first differential pattern corresponding to the two SSBs is 0000000010. Then, according to the first difference pattern, the terminal device can determine which positions of the first PBCH data of the two SSBs have different data. In an implementation manner, the terminal device can obtain a determined second differential pattern according to the first differential pattern, the second differential pattern occupies 864 bits, and each bit is 0 or 1, wherein the X-th differential pattern in the second differential pattern A bit of 0 indicates that the data corresponding to the Xth bit of the first PBCH data of two complete SSBs is the same, and the Xth bit of the second differential pattern is 1 indicates that the data of the first PBCH data of two complete SSBs corresponds to the Xth bit The bit data is not the same. In this way, the terminal device can combine the two SSB parts according to the second differential pattern. Assuming that the SSB#1 part received by the terminal device includes the first M bits of the second PBCH data of SSB#1, and the SSB#2 part includes the last (864-M) bits of the second PBCH data of SSB#2, because the first The differential pattern 0000000010 is known, then, the terminal device can determine the data of the first M bits of the second PBCH data of SSB#2 according to the value of the first 4 bits in the second differential pattern, and splicing SSB#2 The combined result can be obtained from the last (864-M) bits of the second PBCH data. As an example, the SSB#1 part includes the first 4 bits of the second PBCH data of SSB#1, which are 0.98, 0.97, 1.05, and 0.93 respectively. Due to frame synchronization, the terminal device knows the first differential pattern corresponding to the two SSB parts , determine an 864-bit second differential pattern according to the first differential pattern, wherein the first 4 bits of the second differential pattern are 0100, therefore, the terminal device determines that the first 4 bits of the second PBCH data of SSB#2 are 0.98, - 1.05, 0.8, 0.93 (that is, the data of the 1st, 3rd, and 4th bits remain unchanged, and the data of the 2nd bit is reversed), and then, the last 860 bits of the second PBCH data of SSB#2 are spliced, which is equivalent to The second PBCH data of SSB#2 is obtained. Similarly, the second PBCH data of SSB#1 may also be determined according to the above method, which will not be repeated here.

It should be understood that, in the above example, if the second PBCH data of SSB#1 is obtained through combination, then the first SSB is SSB#1; if the second PBCH data of SSB#2 is obtained through combination, then the first SSB is SSB#2.

Similarly, the process for the terminal device to merge N (N≥2) SSB parts is the same as above. The terminal device can obtain a determined second differential pattern according to the first differential pattern corresponding to the N SSB parts. The bit dimension of the second differential pattern is (N-1)*864 bits, and each bit is 0 or 1. As an example, N=3, the SFN bits of the SSB#1 part, SSB#2 part and SSB#3 part received by the terminal equipment are respectively SFN bit #1, SFN bit #2 and SFN bit #3, in the adjacent difference method The first differential pattern corresponding to the three SSB parts is ((SFN bit #1 exclusive OR SFN bit #2) & (SFN bit #2 exclusive OR SFN bit #3)), then the terminal device can obtain A determined second differential pattern, where the bit dimension of the second differential pattern is 2*864 bits. Wherein, the first 864 bits of the second differential pattern are determined according to the result of (SFN bit #1 XOR SFN bit #2), and the Xth bit in the first 864 bits of the second differential pattern is 0 to indicate SSB #1 It is the same as the X-th data corresponding to the first PBCH data of SSB#2, and the X-th bit in the first 864 bits of the second differential pattern is 1, indicating that the first PBCH data corresponding to SSB#1 and SSB#2 The data of the X bits are different. The last 864 bits of the second differential pattern are determined according to the result of (SFN bit #2 XOR SFN bit #3), and the Xth bit in the last 864 bits of the second differential pattern is 0 to indicate SSB #2 and SSB The data corresponding to the Xth bit of the first PBCH data of #3 is the same, and the Xth bit in the last 864 bits of the second differential pattern is 1, indicating that the Xth bit corresponding to the first PBCH data of SSB#2 and SSB#3 data are not the same. In this way, the terminal device can first combine the SSB#1 part and the SSB#2 part to obtain a combined result, and then combine the combined result with the SSB#3 part to obtain the combined data of the three SSB parts (that is, the first SSB ).

It should be understood that the above solution is based on the non-initial access of the terminal device and the frame synchronization has been realized. Since the SFN of the received SSB is known, the terminal device can directly obtain the first differential pattern corresponding to the N SSB parts. The result of combining N SSB parts. However, for the initial access terminal equipment, the frame synchronization has not been realized yet, and the terminal equipment does not know the frame numbers of the received N SSBs. Therefore, the terminal equipment cannot directly obtain the first differential pattern corresponding to the N SSBs, and cannot A combined result is obtained according to the first difference pattern.

In view of this, below, for an initial access terminal device, a specific method for obtaining the first differential pattern corresponding to N SSB parts is given.

(1) The terminal device enumerates all possible differential patterns corresponding to the N SSBs according to the relationship of the received SFN difference values of the N SSBs.

It should be understood that the period for the terminal device to retrieve the SSB is definite, therefore, the difference between the SFNs of the received SSBs is known to the terminal device.

For example, the terminal device receives two SSB parts, and the difference between the SFNs corresponding to the two SSB parts is 2. Since the range of SFN is 0 to 1023, the terminal device needs to enumerate all the differential patterns corresponding to the SFN difference being 2. . Then, sending a frame starting with any SFN will generate 1024 differential patterns, and the 1024 differential patterns are (0,2), (1,3), (2,4), (3,5)... ..., the differential patterns corresponding to (1021,1023), (1022,0), (1023,1), and the numbers in brackets represent two SFNs respectively.

Optionally, the difference between the SFNs corresponding to the two SSB parts may also be 4 or 6, which is not limited here.

Similarly, as an example, the terminal device receives three SSB parts in sequence. The difference between the SFNs corresponding to the first two SSB parts is 2, and the difference between the SFNs corresponding to the last two SSB parts is 4. Since the SFN ranges from 0 to 1023, then, starting with any SFN to send a frame, the terminal device enumerates (0,2,6), (1,3,7), (2,4,8), (3,5,9)... ..., (1021, 1023, 2), (1022, 0, 4), (1023, 1, 6) correspond to 1024 differential patterns, and the numbers in brackets represent 3 SFNs respectively.

Similarly, how to enumerate the differential patterns corresponding to the four SSB parts received by the terminal device in sequence will not be described here.

Optionally, when N is greater than 2, the enumerated 1024 difference patterns may be determined according to the above-mentioned adjacent difference method or anchor point difference method.

In this way, the terminal device can obtain different differential patterns according to the SFN bits corresponding to the enumerated N SFNs, and the first differential pattern corresponding to the N SSB parts received by the terminal device must be one of the 1024 differential patterns.

(2) The terminal device retains different differential patterns among the 1024 differential patterns.

Optionally, when N=2, the difference value of SFN corresponding to the two SSB parts is 2, and 9 different difference patterns as shown in Table 1 can be obtained.

Table 1

(0000000010)
(0000000110)
(0000001110)
(0000011110)
(0000111110)
(0001111110)
(0011111110)
(0111111110)
(1111111110)

Optionally, when N=3, the difference between the SFNs corresponding to the first two SSB parts is 2, and when the difference between the SFNs corresponding to the last two SSB parts is 2, according to the adjacent difference method above, it can be obtained as The 16 different differential patterns shown in Table 2.

Table 2

(0000000010 0000000110)
(0000000110 0000000010)
(0000000010 0000001110)
(0000001110 0000000010)
(0000000010 0000011110)
(0000011110 0000000010)
(0000000010 0000111110)
(0000111110 0000000010)
(0000000010 0001111110)
(0001111110 0000000010)
(0011111110 0000000010)
(0000000010 0011111110)
(0000000010 0111111110)
(0000000010 1111111110)
(0111111110 0000000010)
(1111111110 0000000010)

Optionally, when N=3, the difference between the SFNs corresponding to the first two SSB parts is 2, and when the difference between the SFNs corresponding to the last two SSB parts is 2, according to the anchor point difference method above, the first The SFN bit of the SSB part received once is the anchor point, and 16 different differential patterns as shown in Table 3 can be obtained.

table 3

Optionally, when N=3, the difference between the SFNs corresponding to the first two SSB parts is 2, and when the difference between the SFNs corresponding to the last two SSB parts is 2, according to the anchor point difference method above, the first The SFN bit of the SSB part received three times is the anchor point, and 16 different differential patterns as shown in Table 4 can be obtained.

Table 4

(0000000100 0000000010)
(0001111100 0000000010)
(0000000100 0000000110)
(0001111100 0001111110)
(0000001100 0000000010)
(0011111100 0000000010)
(0000001100 0000001110)
(0011111100 0011111110)
(0000011100 0000000010)
(0111111100 0000000010)
(0000011100 0000011110)
(0111111100 0111111110)
(0000111100 0000000010)
(0000111100 0000111110)
(1111111100 0000000010)
(1111111100 1111111110)

Optionally, when N=4, when the difference between the SFNs corresponding to two adjacent SSB parts is 2, 22 different differential patterns as shown in Table 5 can be obtained according to the above adjacent differential method .

table 5

Optionally, when N=4, when the difference between the SFNs corresponding to two adjacent SSB parts is 2, according to the anchor point difference method above, the SFN bit of the SSB part received for the first time is used as the anchor point , 22 different differential patterns as shown in Table 6 can be obtained.

Table 6

(0000000010 0000000100 0000000110)
(0000000010 0000001100 0000001110)
(0000000110 0000000100 0000001010)
(0000001110 0000001100 0000001010)
(0000000010 0000011100 0000011110)
(0000000110 0000000100 0000011010)
(0000011110 0000011100 0000011010)
(0000000010 0000111100 0000111110)
(0000000110 0000000100 0000111010)
(0000111110 0000111100 0000111010)
(0000000010 0001111100 0001111110)
(0000000110 0000000100 0001111010)
(0001111110 0001111100 0001111010)
(0000000010 0011111100 0011111110)
(0000000110 0000000100 0011111010)
(0011111110 0011111100 0011111010)
(0000000010 0111111100 0111111110)
(0000000010 1111111100 1111111110)
(0000000110 0000000100 0111111010)
(0000000110 0000000100 1111111010)
(0111111110 0111111100 0111111010)
(1111111110 1111111100 1111111010)

Optionally, when N=4, when the difference between the SFNs corresponding to two adjacent SSB parts is 2, according to the anchor point difference method above, the SFN bit of the SSB part received for the second time is used as the anchor point , 22 different differential patterns as shown in Table 7 can be obtained.

Table 7

(0000000010 0000000110 0000000100)
(0000000010 0000001110 0000001100)
(0000000110 0000000010 0000001100)
(0000001110 0000000010 0000000100)
(0000000010 0000011110 0000011100)
(0000000110 0000000010 0000011100)
(0000011110 0000000010 0000000100)
(0000000010 0000111110 0001111100)
(0000000110 0000000010 0000111100)
(0000111110 0000000010 0000000100)
(0000000010 0001111110 0001111100)
(0000000110 0000000010 0001111100)
(0001111110 0000000010 0000000100)
(0000000010 0011111110 0011111100)
(0000000110 0000000010 0011111100)
(0011111110 0000000010 0000000100)
(0000000010 0111111110 0111111100)
(0000000010 1111111110 1111111100)
(0000000110 0000000010 0111111100)
(0000000110 0000000010 1111111100)
(0111111110 0000000010 0000000100)
(1111111110 0000000010 0000000100)

Optionally, when N=4, when the difference between the SFNs corresponding to two adjacent SSB parts is 2, according to the anchor point difference method above, the SFN bit of the SSB part received for the third time is used as the anchor point , 22 different differential patterns as shown in Table 8 can be obtained.

Table 8

Optionally, when N=4, when the difference between the SFNs corresponding to two adjacent SSB parts is 2, according to the anchor point difference method above, the SFN bit of the fourth received SSB part is used as the anchor point , 22 different differential patterns as shown in Table 9 can be obtained.

Table 9

(0000000110 0000000100 0000000010)
(0000001010 0000000100 0000000110)
(0000001010 0000001100 0000001110)
(0000001110 0000001100 0000000010)
(0000011010 0000000100 0000000110)
(0000011010 0000011100 0000011110)
(0000011110 0000011100 0000000010)
(0000111010 0000000100 0000000110)
(0000111010 0000111100 0000111110)
(0000111110 0000111100 0000000010)
(0001111010 0000000100 0000000110)
(0001111010 0001111100 0001111110)
(0001111110 0001111100 0000000010)
(0011111010 0000000100 0000000110)
(0011111010 0011111100 0011111110)
(0011111110 0011111100 0000000010)
(0111111010 0000000100 0000000110)
(0111111010 0111111100 0111111110)
(0111111110 0111111100 0000000010)
(1111111010 0000000100 0000000110)
(1111111010 1111111100 1111111110)
(1111111110 1111111100 0000000010)

Optionally, the above table may also be pre-configured locally, and the terminal device reads the corresponding table locally when needed.

Optionally, the above table may be calculated by the network device and sent to the terminal device by the network device. In this step, the terminal device only needs to be able to obtain the information in the corresponding table, and the obtaining method and form form are not specifically limited in this application.

Optionally, the tables in this application may also be in a set or other forms, which is not limited in this application.

(3) During the initial access process, the terminal device selects the differential pattern in the differential pattern table corresponding to the N SSB parts in the first order, and merges the N SSB parts according to the selected differential pattern until the correct differential pattern is selected. Pattern (difference pattern actually corresponding to N SSB parts).

For ease of understanding, take N=2, and the difference between the SFNs corresponding to the two SSB parts received by the terminal device is equal to 2 as an example. The terminal device selects the difference patterns in the first order in Table 1 to perform the merging operation.

Optionally, the first order is a randomly selected order, that is, the terminal device randomly selects a differential pattern in Table 1 to combine the SSB part. Specifically, the terminal device randomly selects a differential pattern in Table 1, and if it finds that it is not a differential pattern corresponding to the N SSB parts after merging, it continues to randomly select a differential pattern from the remaining 8 differential patterns. Still not the differential pattern corresponding to the N SSB parts, continue to randomly select a differential pattern from the remaining 7 differential patterns to perform the merging operation until the correct differential pattern is selected.

Optionally, the first order is the order of the matching probabilities of the nine differential patterns in Table 1 from large to small, that is, the terminal device selects the differential patterns in descending order according to the matching probabilities of the nine differential patterns in Table 1 to perform the SSB part. Merge until the correct difference pattern is selected. Wherein, the matching probability of a differential pattern is the probability that the differential pattern appears in the enumerated 1024 differential patterns. For example, if a differential pattern appears 512 times in the enumerated 1024 differential patterns, the matching probability of the differential pattern is 1/2.

After the terminal device selects a differential pattern in Table 1 according to the first order, it merges the two received SSB parts according to the selected differential pattern. For the specific method of merging, refer to the description above, which will not be repeated here.

It should be understood that since one and only one of the nine differential patterns in Table 1 is the same as the differential pattern corresponding to the two SSB parts, that is to say, one and only one of the nine differential patterns can generate a combined gain, therefore, The terminal device needs at most 9 times to select the correct differential pattern.

Optionally, a verification method for determining the combination gain generated by the two SSB parts is that the first SSB generated by combining the two SSB parts passes the CRC check.

Similarly, when N=3, the terminal device can select the correct differential pattern at most 16 times, and when N=4, the terminal device can select the correct differential pattern at most 22 times. It can be seen that the above method reduces the maximum number of blind detection times of correct differential patterns corresponding to N SSB parts from 1024 to 9, 16 and 22, greatly reducing the number of blind detection times of narrowband terminal devices in the initial access stage.

The process of obtaining the first differential pattern of the N SSB parts for the initial access terminal device is described in detail above. Then, for the non-initial access terminal device that has achieved frame synchronization, the above table can also be increased by some The information is stored locally, and the terminal device can directly read the locally stored table when needed, and obtain the correct differential pattern by looking up the table.

As an example, for a scenario where the terminal device has achieved frame synchronization, the table stored locally by the terminal device may have the following two forms. The two table formats are described in detail below.

first form form

Optionally, when N=2, the difference value of SFN corresponding to the two SSB parts is 2, and the differential pattern set shown in Table 10 can be obtained. Among them, compared with Table 1, Table 10 adds a column corresponding to all starting SFNs. The data in the second column in each row represents all possible starting SFNs corresponding to the differential pattern given in the first column in each row.

Table 10

As an example, the terminal device receives two SSB parts, the SFNs of the two SSB parts are 1 and 3 respectively, and the starting SFN of the two SSB parts is 1, then, the difference between the two SSB parts can be obtained by looking up table 1 The pattern is 0000000010.

Optionally, when N=3, the difference between the SFNs corresponding to the first two SSB parts is 2, and when the difference between the SFNs corresponding to the last two SSB parts is 2, the differential pattern set shown in Table 11 can be obtained . Among them, compared with Table 2, Table 11 adds a column corresponding to all starting SFNs. The data in the second column in each row represents all possible starting SFNs corresponding to the differential pattern given in the first column in each row.

Table 11

Differential pattern	Corresponding to all starting SFNs
(0000000010 0000000110)	0, 1, 8, 9...
(0000000110 0000000010)	2, 3, 10, 11...
(0000000010 0000001110)	4, 5, 20, 21...
(0000001110 0000000010)	6, 7, 22, 23...
(0000000010 0000011110)	12, 13, 44, 45...
(0000011110 0000000010)	14, 15, 46, 47...
(0000000010 0000111110)	28, 29, 92, 93...
(0000111110 0000000010)	30, 31, 94, 95…
(0000000010 0001111110)	60, 61, 188, 189…
(0001111110 0000000010)	62, 63, 190, 191...
(0011111110 0000000010)	126, 127, 382, 383...
(0000000010 0011111110)	124, 125, 380, 381…
(0000000010 0111111110)	252, 253, 764, 765…
(0000000010 1111111110)	508, 509, 1020, 1021...
(0111111110 0000000010)	254, 255, 766, 767…
(1111111110 0000000010)	510, 511, 1022, 1023...

As an example, the terminal device receives 3 SSB parts, the SFNs of the 3 SSB parts are 1, 3, and 5 respectively, and the starting SFN of the 3 SSB parts is 1, then, the 3 SSB parts can be obtained by looking up table 1 The differential pattern of is 0000000010 0000000110.

Optionally, when N=3, the difference between the SFNs corresponding to the first two SSB parts is 2, and when the difference between the SFNs corresponding to the last two SSB parts is 2, according to the anchor point difference method above, the first The SFN bit of the SSB part received once is the anchor point, and the differential pattern set shown in Table 12 can be obtained. Among them, compared with Table 3, Table 12 adds a column corresponding to all starting SFNs. The data in the second column in each row represents all possible starting SFNs corresponding to the differential pattern given in the first column in each row.

Table 12

As an example, the terminal device receives 3 SSB parts, the SFNs of the 3 SSB parts are 1, 3, and 5 respectively, and the starting SFN of the 3 SSB parts is 1, then, the 3 SSB parts can be obtained by looking up table 1 The differential pattern for is 0000000010 0000000100.

The first table format corresponding to Table 4 to Table 9 will not be described here one by one.

For frame-synchronized terminal equipment, the first form is used. In the case of knowing the SFN of N SSB parts, the differential pattern of the current N SSB parts can be obtained by directly looking up the table, and the correct differential pattern can be found once. Based on the combination of N SSB parts, the SSB receiving efficiency of the narrowband terminal equipment is improved.

second form form

Optionally, when N=2, the difference value of SFN corresponding to the two SSB parts is 2, and the differential pattern set shown in Table 13 can be obtained. Among them, Table 13 adds two columns compared to Table 1, wherein, the data in the second column of each row represents the matching probability of the differential pattern given by the first column in each row, and the data in the third column of each row represents the matching probability of each row The minimum two starting SFNs corresponding to the differential patterns given in the first column of .

Table 13

Differential pattern	match probability	The smallest two starting frame numbers
(0000000010)	1/2	0, 1
(0000000110)	1/4	2, 3
(0000001110)	1/8	6, 7
(0000011110)	1/16	14, 15
(0000111110)	1/32	30, 31
(0001111110)	1/64	62,63
(0011111110)	1/128	126, 127
(0111111110)	1/256	254, 255
(1111111110)	1/256	510, 511

Since the second table format does not give all the starting SFNs corresponding to each differential pattern, the terminal device also needs to indirectly determine the differential patterns corresponding to the two SSB parts through the parameters in the table. Two possible ways of determining are given below.

Way 1: Determine all the starting SFNs corresponding to each differential pattern in Table 13.

For each differential pattern, all the corresponding starting SFNs can be calculated according to the following formula through the matching probability and the minimum two starting SFNs: all the starting SFNs corresponding to a differential pattern are all_SFN and satisfy: all_SFN=( 2/p)*{0,1,...,(2 ⁹ *p-1)}+start_SFN, where start_SFN is any one of the two smallest starting frame numbers. That is, all the initial SFNs corresponding to the differential pattern are obtained by multiplying the occurrence period of the differential pattern represented by 2/p by the possible number of occurrences in curly brackets and adding any minimum initial SFN. Wherein, p is the matching probability of the differential pattern.

For ease of understanding, an example is given here to illustrate how to determine all the initial SFNs of a differential pattern based on the matching probability of the differential pattern and the minimum two initial SFNs.

As an example, take the differential pattern 1111111110 in the last row of Table 13 as an example to illustrate the calculation process of determining all the initial SFNs corresponding to the differential pattern:

Given that p=1/256, first determine the maximum number of occurrences (2 ⁹ *p-1)=1, the occurrence period of the differential pattern 2/p=512,

When the number of occurrences is 0 and the minimum starting SFN is 510, the corresponding starting SFN is: 512*0+510=510.

When the number of occurrences is 0 and the minimum starting SFN is 511, the corresponding starting SFN is: 512*0+511=511.

When the number of occurrences is 1 and the minimum starting SFN is 510, the corresponding starting SFN is: 512*1+510=1022.

When the number of occurrences is 1 and the minimum starting SFN is 511, the corresponding starting SFN is: 512*1+511=1023.

To sum up, all the starting SFNs corresponding to the differential pattern 1111111110 in the last row are: 510, 511, 1022 and 1023.

In this way, the terminal device can determine all the starting SFNs corresponding to each differential pattern in Table 13, and then determine the differential patterns of the two received SSB parts.

Method 2: A minimum initial SFN can be obtained by calculating the occurrence period of the initial SFN modulus differential pattern, and then find the corresponding differential pattern according to the look-up table 13, wherein the occurrence period of a differential pattern is 2/p, and p is The matching probability of the differential pattern.

As an example, the SFN of the first SSB part of the two SSB parts received by the terminal device is 1022, and the occurrence period of the first differential pattern 0000000010 in Table 13 is 2/p=4, 1022 modulo 4=2, 2 does not include In the two minimum SFNs corresponding to 0000000010 (that is, 0 and 1), therefore, the first differential pattern is not a differential pattern of two SSB parts, and the terminal device continues to judge, and the appearance period of the second differential pattern 0000000110 in Table 13 is 2/p=8, 1022 modulo 8=6, 6 is not included in the two minimum SFNs (ie 2 and 3) corresponding to 0000000110, therefore, the second differential pattern is not a differential pattern of 2 SSBs. By analogy, the occurrence period of the last differential pattern 1111111110 in Table 13 is 2/p=512, 1022 modulo 512=510, since 510 is included in the two minimum SFNs (i.e. 510 and 511) corresponding to 1111111110, therefore, finally A differential pattern is a differential pattern corresponding to two SSB parts.

The second table form corresponding to Table 4 to Table 9 and the method for determining the correct difference pattern will not be described here one by one.

For frame-synchronized terminal devices, the second form is used. When the terminal device knows the SFN of N SSB parts, the indirect table lookup can also find the correct difference pattern at one time, and the second form includes the difference Only three values of the matching probability and the initial SFN are stored outside the pattern, which can also save the storage space of the terminal device compared with the second form.

The process of obtaining the first differential pattern of the N SSB parts through the pre-configured differential pattern table or the differential pattern table calculated by itself for the initial access terminal device and the non-initial access terminal device that has achieved frame synchronization has been described in detail above. description, and then the terminal device combines the N SSB parts according to the acquired first differential pattern to obtain the first SSB. For the specific process of combining to obtain the first SSB, refer to the description in S502, which will not be repeated here.

S503. The terminal device acquires system information according to the first SSB.

Specifically, the terminal device demodulates and decodes the data in the first SSB, so as to obtain necessary information for the terminal device to access the network.

In the above technical solution, the narrowband terminal device first hops the received N SSB parts multiple times, and then merges the data of the N SSB parts across frames according to the differential pattern corresponding to the N SSB parts, thereby improving the SSB of the narrowband terminal device. Receive performance. It should be understood that when the frequency domain resources occupied by N SSB parts are the same as the frequency domain resources occupied by any complete SSB in one MIB period, the narrowband terminal equipment can also receive SSB.

The communication method provided by the present application has been described in detail above, and the communication device provided by the present application will be introduced below.

Referring to FIG. 7 , FIG. 7 is a schematic block diagram of a communication device 1000 provided in this application.

In a possible design, the communication device 1000 includes a receiving unit 1100 and a processing unit 1200 . The communication device 1000 can implement the steps or processes corresponding to the execution of the terminal device in the above method embodiments, for example, the communication device 1000 can be a terminal device, or can also be a chip or a circuit configured in the terminal device. The receiving unit 1100 is configured to perform receiving-related operations of the terminal device in the above method embodiments, and the processing unit 1200 is configured to perform processing-related operations of the terminal device in the above method embodiments.

In a possible implementation manner, the receiving unit 1100 receives N synchronization signal block SSB parts within one master information block MIB period, and the frequency domain resources occupied by the N SSB parts do not completely overlap, wherein the maximum bandwidth of the terminal device The capability is less than the bandwidth of one SSB, and the N is an integer greater than or equal to 2; the processing unit 1200 combines the N SSB parts according to the first differential pattern to obtain the first SSB, and the first differential pattern is used to represent Differences in PBCH modulation and coding bits of N complete SSBs corresponding to the N SSB parts; the processing unit 1200 is further configured to acquire system information according to the first SSB. For the first differential pattern, reference may be made to the description in the above embodiment corresponding to FIG. 5 , which will not be repeated here.

Optionally, the processing unit 1200 is specifically configured to: determine a second differential pattern according to the first differential pattern, the bit dimension of the second differential pattern is (N-1)*X, and the X is a PBCH in an SSB Modulating the number of coded bits; combining the N SSB parts according to the second differential pattern to obtain the first SSB.

Optionally, the processing unit 1200 is further configured to load the locally stored first differential pattern set, or calculate and generate the first differential pattern set.

Optionally, the processing unit 1200 is further configured to determine that the first SSB passes the cyclic redundancy check (CRC).

Optionally, the receiving unit 1100 is further configured to acquire first information, where the first information includes the first differential pattern set and all starting SFNs corresponding to each differential pattern in the first differential pattern set; processing The unit 1200 is further configured to determine the first differential pattern from the first differential pattern set, where all the starting SFNs corresponding to the first differential pattern include the first SFN received in the one MIB period SSB's SFN.

Optionally, the receiving unit 1100 is further configured to obtain second information, where the second information includes the first set of differential patterns, matching probabilities corresponding to each differential pattern in the first set of differential patterns, and the The two smallest SFNs among all the starting SFNs corresponding to each differential pattern; the processing unit 1200 is further configured to determine all the starting SFNs corresponding to each differential pattern according to the second information; the processing unit 1200 is also used to Determining the first differential pattern from the first differential pattern set, wherein all starting SFNs corresponding to the first differential pattern include the SFN of the first SSB received in the one MIB period.

Optionally, the communication device 1000 further includes a sending unit 1300 . The sending unit 1300 and the receiving unit 1100 can also be integrated into a transceiver unit, which has both receiving and sending functions, which is not limited here.

Optionally, in an implementation manner in which the communication apparatus 1000 is a terminal device in the method embodiment, the sending unit 1300 may be a transmitter, and the receiving unit 1100 may be a receiver. Receiver and transmitter can also be integrated into a transceiver. The processing unit 1200 may be a processing device.

Wherein, the functions of the processing device may be realized by hardware, or may be realized by executing corresponding software by hardware. For example, the processing device may include a memory and a processor, where the memory is used to store computer programs, and the processor reads and executes the computer programs stored in the memory, so that the communication device 1000 executes the operations and operations performed by the terminal device in each method embodiment. /or processing. Alternatively, the processing means may comprise only a processor, and the memory for storing the computer program is located outside the processing means. The processor is connected to the memory through circuits/wires to read and execute the computer programs stored in the memory. As another example, the processing device may be a chip or an integrated circuit.

Optionally, in an implementation where the communication device 1000 is a chip or an integrated circuit installed in a terminal device, the sending unit 1300 and the receiving unit 1100 may be a communication interface or an interface circuit, for example, the sending unit 1300 is an output interface or an output circuit, the receiving unit 1100 is an input interface or an input circuit. The processing unit 1200 may be a processor or a microprocessor integrated on the chip or integrated circuit. It is not limited here.

Referring to FIG. 8 , FIG. 8 is a schematic structural diagram of a communication device 10 provided in this application. The device 10 includes a processor 11, and optionally, a memory 12, the processor 11 is coupled to the memory 12, the memory 12 is used to store computer programs or instructions and/or data, and the processor 11 is used to execute the computer stored in the memory 12. programs or instructions, or read data stored in the memory 12, to execute the methods in the above method embodiments.

Optionally, there are one or more processors 11 .

Optionally, there are one or more memories 12 .

Optionally, the memory 12 is integrated with the processor 11, or is set separately.

Optionally, as shown in FIG. 8 , the device 10 further includes a transceiver 13, and the transceiver 13 is used for receiving and/or sending signals. For example, the processor 11 is configured to control the transceiver 13 to receive and/or send signals.

As a solution, the apparatus 10 is used to implement the operations performed by the terminal device in the above method embodiments.

For example, the processor 11 is configured to execute computer programs or instructions stored in the memory 12, so as to implement related operations performed by the terminal device in the above method embodiments. For example, implement the method performed by the terminal device in the embodiment shown in FIG. 5 .

In addition, the present application also provides a computer-readable storage medium, where computer instructions are stored in the computer-readable storage medium, and when the computer instructions are run on the computer, the operations performed by the terminal device in each method embodiment of the present application are and/or process is executed.

The present application also provides a computer program product. The computer program product includes computer program codes or instructions. When the computer program codes or instructions are run on the computer, the operations and/or processes performed by the terminal device in each method embodiment of the present application are be executed.

In addition, the present application also provides a chip, and the chip includes a processor. The memory used to store the computer program is set independently of the chip, and the processor is used to execute the computer program stored in the memory, so that the operations and/or processing performed by the terminal device in any method embodiment are performed.

Further, the chip may further include a communication interface. The communication interface may be an input/output interface, or an interface circuit or the like. Further, the chip may further include a memory.

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip capable of processing signals. In the implementation process, each step of the above-mentioned method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software. The processor can be a central processing unit (central processing unit, CPU), or other general-purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuits, ASICs), field programmable Gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like. The steps of the methods disclosed in the embodiments of the present application may be directly implemented by a hardware coded processor, or executed by a combination of hardware and software modules in the coded processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

The memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory can be random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, many forms of RAM are available such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM ) and direct memory bus random access memory (direct rambus RAM, DRRAM).

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, the memory (storage module) may be integrated in the processor.

It should also be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application can be embodied in the form of software products. The computer software products are stored in a storage medium and include several instructions to make a computer device (which can be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: various media capable of storing program codes such as U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk.

It should be understood that references to "an embodiment" throughout this specification mean that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Thus, the various embodiments throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

It should also be understood that the ordinal numerals such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority or importance etc. For example, the first information and the second information do not indicate the difference in information volume, content, priority or importance.

It should also be understood that in this application, "when", "if" and "if" all mean that the network element will make corresponding processing under certain objective circumstances, and it is not a limited time, and it does not require the network element to There must be an action of judgment during implementation, and it does not mean that there are other restrictions.

It should also be understood that in this application, "at least one" means one or more, and "multiple" means two or more. "At least one item" or similar expressions refer to one item or multiple items, that is, any combination of these items, including any combination of a single item or plural items. For example, at least one item (piece) of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c.

It should also be understood that the meaning of the expression similar to "the item includes one or more of the following: A, B, and C" appearing in this application, unless otherwise specified, usually means that the item can be any of the following : A; B; C; A and B; A and C; B and C; A, B and C; A and A; A, A and A; A, A and B; A, A and C, A, B and B; A, C and C; B and B, B, B and B, B, B and C, C and C; C, C and C, and other combinations of A, B and C. The above is an example of the three elements of A, B and C to illustrate the optional items of the project. When the expression is "the project includes at least one of the following: A, B, ..., and X", it is in the expression When there are more elements, then the applicable entries for this item can also be obtained according to the aforementioned rules.

It should also be understood that the term "and/or" in this article is only an association relationship describing associated objects, indicating that there may be three relationships, for example, A and/or B may indicate: A exists alone, and A and B exist simultaneously. B, the case where B exists alone, where A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. For example, A/B means: A or B.

It should also be understood that in each embodiment of the present application, "A corresponds to B" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B may also be determined according to A and/or other information.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (17)

1. A method for receiving a synchronization signal block, comprising:

   The terminal device receives N synchronization signal block SSB parts within one master information block MIB period, and the frequency domain resources occupied by the N SSB parts do not completely overlap, wherein the maximum bandwidth capability of the terminal device is less than the bandwidth of one SSB, The N is an integer greater than or equal to 2;

   The terminal device combines the N SSB parts according to the first differential pattern to obtain the first SSB, and the first differential pattern is used to represent the PBCH modulation and coding bits of the N complete SSBs corresponding to the N SSB parts difference;

   The terminal device acquires system information according to the first SSB.
2. The method according to claim 1, wherein the first differential pattern belongs to a first differential pattern set, the first differential pattern set includes a plurality of differential patterns, and the multiple differential patterns are different from each other, Wherein, the differential pattern is the result of splicing the system frame number SFN bits of any two adjacent SSBs in the N SSBs after the XOR operation, or the differential pattern is the SFN bit of any SSB in the N SSBs The result obtained after splicing with the SFN bit XOR operation of each SSB in the remaining N-1 SSBs, the first differential pattern set contains differential patterns corresponding to any N SSBs, and the arbitrary N SSBs The difference between the SFN and the difference between the SFN between the N SSB parts satisfy the same relationship, where the SFN bit is a 10-bit binary number of the SFN.
3. The method according to claim 1 or 2, wherein the terminal device combines the N SSB parts according to the first differential pattern to obtain the first SSB, including:

   The terminal device determines a second differential pattern according to the first differential pattern, the bit dimension of the second differential pattern is (N-1)*X, and the X is the number of bits of PBCH modulation and coding bits in one SSB;

   The terminal device combines the N SSB parts according to the second differential pattern to obtain the first SSB.
4. The method according to claim 2 or 3, characterized in that the method further comprises:

   The terminal device selects the first differential pattern from the first differential pattern set, and the selection order of the first differential pattern is random, or, the selection order of the first differential pattern is based on the first differential pattern The matching probability of a differential pattern is determined.
5. The method according to any one of claims 2 to 4, wherein the method further comprises:

   The terminal device loads the locally stored first differential pattern set,

   or,

   The terminal device calculates and generates the first difference pattern set.
6. The method according to any one of claims 1 to 5, wherein the method further comprises:

   The terminal device determines that the first SSB passes a cyclic redundancy check (CRC) check.
7. The method according to claim 2 or 3, characterized in that the method further comprises:

   The terminal device acquires first information, where the first information includes the first differential pattern set and all starting SFNs corresponding to each differential pattern in the first differential pattern set;

   The terminal device determines the first differential pattern from the first differential pattern set, where all the starting SFNs corresponding to the first differential pattern include the first SSB received in the one MIB period SFN.
8. The method according to claim 2 or 3, characterized in that the method further comprises:

   The terminal device acquires second information, where the second information includes the first set of differential patterns, matching probabilities corresponding to each differential pattern in the first differential pattern set, and all matching probabilities corresponding to each differential pattern. The two smallest SFNs among the starting SFNs;

   determining, by the terminal device, all starting SFNs corresponding to each differential pattern according to the second information;

   The terminal device determines the first differential pattern from the first differential pattern set, where all the starting SFNs corresponding to the first differential pattern include the first SSB received in the one MIB period SFN.
9. A communication device, characterized in that the communication device is a terminal device or a chip in the terminal device includes:

   The receiving unit is configured to receive N synchronization signal block SSB parts within one master information block MIB period, the frequency domain resources occupied by the N SSB parts do not completely overlap, wherein the maximum bandwidth capability of the terminal device is less than one SSB bandwidth, the N is an integer greater than or equal to 2;

   A processing unit, configured to combine the N SSB parts according to the first differential pattern to obtain the first SSB, and the first differential pattern is used to represent the PBCH modulation coding bits of the N complete SSBs corresponding to the N SSB parts difference;

   The processing unit is further configured to acquire system information according to the first SSB.
10. The device according to claim 9, wherein the first differential pattern belongs to a first differential pattern set, the first differential pattern set includes a plurality of differential patterns, and the multiple differential patterns are different from each other, Wherein, the differential pattern is the result of splicing the system frame number SFN bits of any two adjacent SSBs in the N SSBs after the XOR operation, or the differential pattern is the SFN bit of any SSB in the N SSBs The result obtained after splicing with the SFN bit XOR operation of each SSB in the remaining N-1 SSBs, the first differential pattern set contains differential patterns corresponding to any N SSBs, and the arbitrary N SSBs The difference between the SFN and the difference between the SFN between the N SSB parts satisfy the same relationship, where the SFN bit is a 10-bit binary number of the SFN.
11. The device according to claim 9 or 10, wherein the processing unit is specifically configured to determine a second differential pattern according to the first differential pattern, and the bit dimension of the second differential pattern is (N-1 )*X, where X is the number of PBCH modulation coded bits in one SSB; and, according to the second differential pattern, the N SSB parts are combined to obtain the first SSB.
12. The device according to claim 10 or 11, wherein the processing unit is further configured to select the first differential pattern from the set of first differential patterns, wherein the selection of the first differential pattern The order is random, or, the selection order of the first difference pattern is determined according to the matching probability of the first difference pattern.
13. The device according to any one of claims 10 to 12, wherein the processing unit is further configured to load the locally stored first differential pattern set, or calculate and generate the first differential pattern gather.
14. The device according to any one of claims 9 to 13, wherein the processing unit is further configured to determine that the first SSB passes a cyclic redundancy check (CRC).
15. Apparatus according to claim 10 or 11, characterized in that

    The receiving unit is further configured to obtain first information, where the first information includes the first differential pattern set and all starting SFNs corresponding to each differential pattern in the first differential pattern set;

    The processing unit is further configured to determine the first differential pattern from the first differential pattern set, where all the starting SFNs corresponding to the first differential pattern include the first SFN received in the one MIB cycle. One SSB's SFN.
16. Apparatus according to claim 10 or 11, characterized in that

    The receiving unit is further configured to acquire second information, the second information including the first set of differential patterns, the matching probability corresponding to each differential pattern in the first differential pattern set, and the matching probability of each differential pattern The smallest two SFNs among all the starting SFNs corresponding to the pattern;

    The processing unit is further configured to determine all starting SFNs corresponding to each differential pattern according to the second information;

    The processing unit is further configured to determine the first differential pattern from the first differential pattern set, where all the starting SFNs corresponding to the first differential pattern include the first SFN received in the one MIB cycle. One SSB's SFN.
17. A computer-readable storage medium, characterized in that computer instructions are stored in the computer-readable storage medium, and when the computer instructions are run on a computer, the method according to any one of claims 1 to 8 be executed.

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