CN111385867B

CN111385867B - Communication method and device

Info

Publication number: CN111385867B
Application number: CN201811641405.8A
Authority: CN
Inventors: 李超君; 郑娟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2021-07-09
Anticipated expiration: 2038-12-29
Also published as: CN111385867A; WO2020135166A1

Abstract

The application discloses a communication method and device. The synchronization process detects a first identifier of the first cell, and the terminal device further determines a second identifier of the first cell for a service transmission process, where the first identifier is one of N identifiers, the second identifier is one of M identifiers, and M is greater than N. Wherein N is less than or equal to 504 and M is greater than or equal to 1008. Therefore, the complexity of synchronous detection can be reduced, and the reliability of channel transmission is improved.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to configuration of a cell identifier (cellID).

Background

In a Long Term Evolution (LTE)/New Radio (NR) communication system, in a current cell identification (cellID) configuration, each individual cell uses a different cell ID. Here, the cell ID may refer to a Physical Cell Identity (PCI). And the terminal completes the time and frequency synchronization with the base station through the downlink synchronization process and obtains the PCI of the cell. The synchronization process is completed by detecting a synchronization sequence, the cellID corresponds to the synchronization sequence, the sequences corresponding to different cellIDs occupy the same resource on a time frequency domain for transmission, and the timing synchronization and frequency offset estimation are completed by detecting the synchronization sequence to obtain the cellID. As the number of cells increases, the transmission of synchronization sequences on the same time-frequency resource will cause more interference.

In addition, because the internet of things (M2M) applies requirements for low power consumption, deep coverage, low cost, and the like, and most of terminals of M2M are in an environment with a low signal-to-noise ratio, the complexity of synchronous detection needs to be reduced as much as possible while the synchronous detection performance is ensured.

In addition, in LTE/NR, colored interference signals in the same-frequency adjacent regions are converted into random interference through a sequence scrambling or interweaving method. The purpose of interference randomization is achieved by adding a pseudo-random sequence in a time domain during sequence scrambling, and different sequences are used by each channel or signal in different cells, subframes and users. In narrowband-based (NB-IoT based) LTE based on the internet of things, a synchronization process mainly includes two downlink synchronization signal detections, namely Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS), where the range of the number of the indexable PCIs 0 to 504, and the identification range may be {0, …,503 }. When channels such as a data channel, a control channel and the like and signals are scrambled, the cell dimension adopts the PCI to carry out sequence initialization, namely the PCI is used as an input variable of random sequence initialization, and the identification range is {0, …,503 }. The number range of the available cell IDs detected in the synchronization process is 0-504, the number of the available cell IDs is still 504 when signals such as data channels, control channels and the like and signals are scrambled, and the interference randomization effect is limited.

In NR, the synchronization signals also include PSS and SSS. The primary and secondary synchronization sequences of different cells are respectively obtained by cyclic shift of respective base sequences according to the primary and secondary synchronization sequences, and 1008 different cell IDs are supported. When channels such as a data channel, a control channel and the like are scrambled, the channel is unbound with the cell ID, and the channel can be independently configured through high-level signaling parameters, and the identification range is {0, …,1023 }. For narrowband IoT networks, design requirements support more distant and deeper coverage, the main enhancement for the synchronization channel is to repeat more densely in the time domain, and for NR systems, denser PSS/SSS results in less efficient use of resources.

Based on this, the present application provides a configuration scheme of the cell ID to reduce the detection complexity of the synchronization process and improve the reliability of channel transmission.

Disclosure of Invention

The application provides a communication method and device to reduce the detection complexity of a synchronization process and improve the reliability of channel transmission.

In a first aspect, a communication method is provided, the method including: the terminal equipment detects a first synchronization signal; the terminal equipment obtains a first identifier of a cell according to the first synchronization signal, wherein the first identifier is one of N identifiers; the terminal equipment determines a second identifier of the cell, wherein the second identifier is one of the M identifiers; wherein M is larger than N, and M, N are positive integers.

In this aspect, the synchronization process detects a first identifier of the cell, and the terminal device further determines a second identifier of the cell for use in the service transmission process, where the first identifier is one of N identifiers, the second identifier is one of M identifiers, and M is greater than N, so that complexity of synchronization detection can be reduced, and reliability of channel transmission is improved.

In one implementation, N is less than or equal to 504 and M is greater than or equal to 1008.

In this implementation, the synchronization process supports detecting 504 one of the cell identities, which may reduce the complexity of synchronization detection; and when carrying on the business transmission, can expand the range of number of cell labels to be greater than or equal to 1008, can reduce the interference among the cells, improve the reliability of the channel transmission.

In another implementation, the method further comprises: and the terminal equipment receives a downlink channel from the network equipment or sends an uplink channel to the network equipment according to the second identifier.

In the implementation mode, in the downlink channel transmission process, the terminal device descrambles the received downlink channel according to the second identifier; in the process of uplink channel transmission, the terminal device scrambles the uplink channel according to the second identifier, so that the interference among cells can be reduced, and the reliability of channel transmission can be improved.

In yet another implementation, the determining, by the terminal device, the second identifier of the cell includes: the terminal equipment receives indication information from the network equipment, wherein the indication information is used for indicating the second identifier; or the terminal device receives the second identifier from the network device; or the terminal device determines the second identifier according to a rule configured or defined in advance.

In this implementation, a plurality of ways for the terminal device to determine the second identifier are given, and any of the ways may be used to determine the second identifier.

In another implementation, the receiving, by the terminal device, the indication information from the network device includes: the terminal device receives a demodulation reference signal in a broadcast message from the network device, wherein the demodulation reference signal is used for indicating the second identifier.

In this implementation, the second identity may be implicitly indicated by the demodulation reference signal sequence.

In yet another implementation, the receiving, by the terminal device, the second identifier from the network device includes: the terminal equipment receives a random access response from the network equipment, wherein the random access response comprises the second identifier; the terminal equipment receives a radio resource control signaling or a media access control element (MAC CE) from the network equipment, wherein the radio resource control signaling or the MAC CE comprises the second identifier; or the terminal device receives broadcast information from the network device, wherein the broadcast information comprises the second identifier.

In this implementation, the second identifier may be carried in a random access response, RRC signaling, MAC CE, or a broadcast message.

In still another implementation manner, the terminal device has a first synchronization signal detection capability and/or a second synchronization signal detection capability, where a third identifier corresponding to the second synchronization signal is one of K identifiers, and K is less than or equal to 1008.

In this implementation, the terminal device may be a medium-high UE, and the medium-high UE has a first synchronization signal detection capability and/or a second synchronization signal detection capability.

In yet another implementation, the method further comprises: the terminal device detects the second synchronization signal.

In this implementation, the terminal device first detects the second synchronization signal, that is, the wideband synchronization signal, and when the second synchronization signal fails to be detected, that is, the third identifier is not recognized, the terminal device continues to detect the first synchronization signal, and obtains the first identifier through detection.

In yet another implementation, the method further comprises: and the terminal equipment acquires the third identifier according to the first synchronous signal and the second synchronous signal.

In this implementation, the middle-high terminal device performs cell search by using the first synchronization signal and the second synchronization signal at the same time, that is, detects the first synchronization signal and the second synchronization signal at the same time, and identifies the third identifier.

In a second aspect, a communication method is provided, the method comprising: the method comprises the steps that network equipment sends a first synchronization signal, wherein the first synchronization signal corresponds to a first identifier of a first cell, and the first identifier is one of N identifiers; the network equipment informs the terminal equipment of a second identifier, wherein the second identifier is a second identifier of the first cell, and the second identifier is one of the M identifiers; wherein M is greater than N, M, N are positive integers, and the first cell is a serving cell of the network device.

In another implementation, the signal quality of the terminal device is below a first threshold.

In another implementation, the notifying, by the network device, the second identifier to the terminal device includes: the network equipment sends the second identifier to the terminal equipment; or the network device sends the indication information of the second identifier to the terminal device, wherein the indication information is used for the second identifier.

In another implementation, the sending, by the network device, the second identifier to the terminal device includes: the network equipment sends a random access response to the terminal equipment, wherein the random access response comprises the second identifier; the network equipment sends a radio resource control signaling or MAC CE to the terminal equipment, wherein the radio resource control signaling or MAC CE comprises the second identifier; or the network device sends broadcast information to the terminal device, wherein the broadcast information comprises the second identifier.

In another implementation manner, the sending, by the network device, the indication information of the second identifier to the terminal device includes: and the network equipment sends a demodulation reference signal of a broadcast message to the terminal equipment, wherein the demodulation reference signal is used for indicating the second identifier.

In yet another implementation, the method further comprises: and the network equipment sends a downlink channel to the terminal equipment or receives an uplink channel from the terminal equipment according to the second identifier.

In yet another implementation, before the network device transmits the first synchronization signal, the method further includes: the network device transmits the second synchronization signal.

In yet another implementation, while the network device transmits the first synchronization signal, the method further includes: the network device transmits the second synchronization signal.

In a third aspect, a communication method is provided, the method including: the method comprises the steps that terminal equipment receives broadcast information, wherein the broadcast information comprises a first identifier which is one of N identifiers; the terminal equipment determines a second identifier of the cell, wherein the second identifier is one of the M identifiers; wherein M is larger than N, and M, N are positive integers.

In this aspect, the PBCH carries the first identifier, and the terminal device further determines a second identifier of the cell for use in the service transmission process, where the first identifier is one of N identifiers, the second identifier is one of M identifiers, and M is greater than N, so that complexity of synchronization detection can be reduced, and reliability of channel transmission is improved.

In a fourth aspect, a method of communication is provided, the method comprising: the method comprises the steps that network equipment broadcasts broadcast information, wherein the broadcast information comprises a first identifier which is one of N identifiers; after the terminal equipment accesses the cell, the network equipment notifies the terminal equipment of a second identifier, wherein the second identifier is one of the M identifiers; wherein M is larger than N, and M, N are positive integers.

A fifth aspect provides a communication apparatus, which may implement the communication method in any possible implementation manner of the first aspect, the third aspect, or both the first aspect and the third aspect. For example, the communication device may be a chip (such as a communication chip) or a terminal device. The above-described method may be implemented by software, hardware, or by executing corresponding software by hardware.

In one possible implementation, the communication device has a structure including a processor, a memory; the processor is configured to support the apparatus to perform corresponding functions in the above-described communication method. The memory is used for coupling with the processor, which holds the necessary programs (instructions) and/or data for the device. Optionally, the communication apparatus may further include a communication interface for supporting communication between the apparatus and other network elements.

In another possible implementation manner, the communication device may include a unit or a module that performs corresponding actions in the above method.

Wherein a communication device corresponding to the first aspect comprises: a processing unit; the processing unit is used for detecting a first synchronization signal; the processing unit is further configured to obtain a first identifier of a cell according to the first synchronization signal, where the first identifier is one of N identifiers; and the processing unit is further configured to determine a second identifier of the cell, where the second identifier is one of the M identifiers; wherein M is larger than N, and M, N are positive integers.

Wherein a communication device corresponding to the third aspect comprises: a transceiving unit and a processing unit; the receiving and sending unit is used for receiving broadcast information, the broadcast information comprises a first identifier, and the first identifier is one of N identifiers; the processing unit is configured to determine a second identifier of the cell, where the second identifier is one of the M identifiers; wherein M is larger than N, and M, N are positive integers.

In yet another possible implementation, the wireless communication device includes a processor and a transceiver, the processor is coupled to the transceiver, and the processor is configured to execute a computer program or instructions to control the transceiver to receive and transmit information; the processor is further configured to implement the above-described method when the processor executes the computer program or instructions. The transceiver may be a transceiver, a transceiver circuit, or an input/output interface. When the communication device is a chip, the transceiver is a transceiver or an input/output interface.

In yet another possible implementation, the communication device has a structure including a processor; the processor is configured to support the apparatus to perform corresponding functions in the above-described communication method.

In yet another possible implementation manner, the communication device includes a processor in a structure, and the processor is configured to couple with the memory, read the instructions in the memory, and implement the above method according to the instructions.

In yet another possible implementation manner, the structure of the communication device includes a transceiver for implementing the above communication method.

When the communication device is a chip, the transceiver unit may be an input/output unit, such as an input/output circuit or a communication interface. When the communication device is a user equipment, the transceiving unit may be a transmitter/receiver or a transmitter/receiver.

A sixth aspect provides a communication apparatus, which may implement the communication method in the second aspect, the fourth aspect, or any possible implementation manner of the second aspect and the fourth aspect. For example, the communication device may be a chip (such as a baseband chip, or a communication chip, etc.) or a network device, and the above method may be implemented by software, hardware, or by executing corresponding software by hardware.

In one possible implementation, the communication device has a structure including a processor, a memory; the processor is configured to support the apparatus to perform corresponding functions in the above-described communication method. The memory is used for coupling with the processor and holds the programs (instructions) and data necessary for the device. Optionally, the communication apparatus may further include a communication interface for supporting communication between the apparatus and other network elements.

In another possible implementation manner, the communication device may include a unit module for performing corresponding actions in the above method.

Wherein a communication device corresponding to the second aspect comprises: a transceiver unit; the receiving and sending unit is used for sending a first synchronization signal, the first synchronization signal corresponds to a first identifier of a first cell, and the first identifier is one of N identifiers; the transceiver unit is further configured to notify the terminal device of a second identifier, where the second identifier is a second identifier of the first cell, and the second identifier is one of M identifiers; wherein M is greater than N, M, N are positive integers, and the first cell is a serving cell of the network device.

Wherein a communication apparatus corresponding to the fourth aspect comprises: a transceiver unit; the receiving and sending unit is used for broadcasting broadcast information, the broadcast information comprises a first identifier, and the first identifier is one of N identifiers; the receiving and sending unit is further configured to notify a second identifier to the terminal device after the terminal device accesses the cell, where the second identifier is one of the M identifiers; wherein M is larger than N, and M, N are positive integers.

When the communication device is a chip, the transceiver unit may be an input/output unit, such as an input/output circuit or a communication interface. When the communication apparatus is a network device, the transceiving unit may be a transmitter/receiver (may also be referred to as a transmitter/receiver).

In a seventh aspect, a computer-readable storage medium is provided, in which a computer program or instructions are stored, which, when executed, implement the method of the first aspect.

In an eighth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.

A ninth aspect provides a communication system comprising the communication apparatus of the fifth and sixth aspects.

Drawings

Fig. 1 is a schematic diagram of a communication system to which the present application relates;

fig. 2 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 3 is a schematic diagram of a low-end terminal device and a medium-end terminal device performing cell access and service transmission;

fig. 4a is a schematic diagram of a specific low-end terminal device performing cell access and service transmission;

fig. 4b is a schematic diagram of a specific middle-high terminal device performing cell access and service transmission;

fig. 5 is a schematic flow chart of cell access and service transmission performed by a low-end terminal device;

fig. 6 is a schematic flow chart of cell access and service transmission performed by the medium-high terminal device;

fig. 7 is a schematic block diagram of a communication device according to an embodiment of the present disclosure;

fig. 8 is a schematic block diagram of another communication device according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a simplified terminal device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a simplified network device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application are described below with reference to the drawings.

Fig. 1 presents a schematic view of a communication system to which the present application relates. The communication system may include at least one network device 100 (only 1 shown) and one or more terminal devices 200 connected to the network device 100.

The network device 100 may be a device capable of communicating with the terminal device 200. The network device 100 may be any device having a wireless transceiving function. Including but not limited to: a base station NodeB, an evolved node b, a base station in the fifth generation (5G) communication system, a base station or network device in a future communication system, an access node in a WiFi system, a wireless relay node, a wireless backhaul node, and the like. The network device 100 may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario. The network device 100 may also be a small station, a Transmission Reference Point (TRP), or the like. The embodiments of the present application do not limit the specific technologies and the specific device forms used by the network devices.

The terminal device 200 is a device with a wireless transceiving function, and can be deployed on land, including indoors or outdoors, hand-held, worn or vehicle-mounted; can also be deployed on the water surface, such as a ship and the like; and may also be deployed in the air, such as airplanes, balloons, satellites, and the like. The terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and so on. The embodiments of the present application do not limit the application scenarios. A terminal device may also sometimes be referred to as a User Equipment (UE), an access terminal device, a UE unit, a mobile station, a remote terminal device, a mobile device, a terminal (terminal), a wireless communication device, a UE agent, a UE device, or the like.

It should be noted that the terms "system" and "network" in the embodiments of the present invention may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present invention. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

The embodiment of the application provides a communication method and a communication device, wherein a first identification of a cell is detected in a synchronization process, a second identification of the cell is further determined by a terminal device and is used in a service transmission process, the first identification is one of N identifications, the second identification is one of M identifications, and M is larger than N, so that the complexity of synchronization detection can be reduced, and the reliability of channel transmission is improved.

Fig. 2 is a flowchart illustrating a communication method according to an embodiment of the present application. Wherein:

s201, a network device sends a first synchronization signal, wherein the first synchronization signal corresponds to a first identifier of a first cell, and the first identifier is one of N identifiers. N is a positive integer.

Optionally, the N or N identifiers are predefined or configured, for example, predefined by a standard.

Wherein the first cell is a serving cell of the network device. Specifically, the network device may serve at least one cell, and these cells may be referred to as serving cells of the network device. Or may also be referred to as, the first cell is a cell served by the network device.

In this embodiment, the synchronization signals include PSS, SSS, and possibly other signals.

The synchronization signal corresponds to the cell ID, and specifically, there are the following correspondence modes: a) indicated collectively by PSS and SSS; b) indicated only by SSS; c) the synchronization signal does not indicate a cell ID but is indicated by a Physical Broadcast Channel (PBCH). The above-mentioned indications can be made in particular with reference to the description in the prior art or in the prior art standard.

Specifically, the cell ID is used as a cell identifier, and if cell ID confusion occurs in an adjacent cell, measurement, mobility switching, and the like of the terminal device are affected. For an NR low power wide area network (LPWA) system, the main scenario is that a macro station performs wide coverage, and therefore, the networking density is not greatly improved compared to NB-IoT based LTE. And the number of the PCIs is determined by the number of the synchronization sequences, and more cell IDs mean higher detection complexity. For the terminal equipment of LPWA, the number of cell ID detections needs to be reduced for cost and complexity reasons.

In summary, it is proposed that the NR LPWA synchronization process detect that the number of available PCIs is maintained at 504 or less than 504. Thus, in some embodiments, the N is less than or equal to 504, i.e., N may be one of {0 … 503 }.

S202, the terminal device detects a first synchronization signal, and obtains a first identifier of the first cell according to the first synchronization signal, wherein the first identifier is one of the N identifiers.

The terminal equipment detects the first synchronization signal to complete time-frequency synchronization with the network equipment.

And since the first synchronization signal indicates the first identity, the terminal device may obtain the first identity by detecting the first synchronization signal. The value of N is small, for example, N is less than or equal to 504, so that the detection complexity is reduced, and the efficiency of detecting the synchronization signal is improved.

The terminal device detects the first synchronization signal, completes time-frequency synchronization with the network device, and can obtain system information after obtaining the first identifier, and performs random access with the network device according to the system information; or the terminal device resides in the cell after detecting the first synchronization signal.

S203, the network device informs the terminal device of a second identifier, wherein the second identifier is a second identifier of the first cell, and the second identifier is one of the M identifiers. Wherein M is larger than N and is a positive integer. And the terminal equipment determines a second identifier of the cell, wherein the second identifier is one of the M identifiers.

Optionally, the M or M identifiers are predefined or configured, for example, predefined by a standard.

Further optionally, the value of M is greater than the value of N. The first identifier is an identifier of the N identifiers, and the second identifier is an identifier of the M identifiers with a value larger than that of the N identifiers, and belongs to a larger value range.

In the LTE/NR system, a method of adding a pseudorandom sequence to a time domain is usually adopted to achieve the purpose of interference randomization. The PCI serves as a cell identity and is scrambled from the cell dimension. An NR LPWAin-band deployment scene, under which intra-frequency networking and inter-frequency networking exist. The intra-system interference mainly comes from LPWA cells during the same-frequency networking. For inter-frequency networking, intra-system interference comes from between LPWA and eMBB cells. Among them, the number of PCIs of NR eMBB has been extended to 1008.

In order to reduce the impact of mutual interference, the range of the number of PCIs of LPWA can be further extended to 1008 and above on the basis of 0-504 NB-IoT scenarios, according to the embodiments of the present invention. The embodiment is particularly suitable for the scene of inter-frequency networking. Optionally, in some embodiments, M is greater than or equal to 1008.

In some embodiments, S203 comprises: and the network equipment sends the second identifier to the terminal equipment. The terminal device receives the second identifier from the network device.

Specifically, for example, after the terminal device initiates random access, the network device sends a Random Access Response (RAR) to the terminal device, and the terminal device receives the RAR. Wherein the RAR comprises the second identifier. The second identity is a terminal equipment-specific (UE-specific) cell identity.

Specifically, the network device notifies the terminal device of the second identifier during the process of accessing the cell by the terminal device or after the access is completed, and when the signal quality of the terminal device is lower than a first threshold value. The signal quality of the terminal device may be used to characterize the coverage level of the terminal device, that is, the network device determines whether to extend the first identifier to the terminal device according to the coverage level of the terminal device. When the terminal device is at the edge, the interference during the channel transmission may be larger, and therefore, the cell identifier needs to be extended. Wherein the first threshold may be pre-configured or pre-defined.

For another example, the network device transmits Radio Resource Control (RRC) signaling to the terminal device, and the terminal device receives the RRC signaling. Wherein, the RRC signaling includes a second identifier. The second identifier is a cell identifier specific to the terminal device.

For another example, the network device transmits a media access control element (MAC CE) to the terminal device, and the terminal device receives the MAC CE. Wherein, the MAC CE includes the second identifier. The second identifier is a cell identifier specific to the terminal device.

For another example, after detecting the first synchronization signal, the terminal device resides in a cell, the network device broadcasts the broadcast information, and the terminal device receives the broadcast information. Wherein, the broadcast information includes a second identifier. The broadcast information refers to information transmitted by way of broadcast, including but not limited to PBCH. The second identity is a cell-specific (cell-specific) cell identity.

In some embodiments, S203 comprises: and the network equipment sends the indication information of the second identifier to the terminal equipment, wherein the indication information is used for the second identifier. And the terminal equipment receives the indication information from the network equipment.

For example, a network device transmits a demodulation reference signal (DMRS) of a broadcast message, and a terminal device receives the DMRS. The DMRS sequence may be used to indicate the second identity. The second identity is a cell identity specific to the cell.

In one implementation, the formation of the DMRS sequence is used to indicate the second identity.

In some embodiments, S203 may be replaced with: and the terminal equipment determines the second identifier according to a rule configured or defined in advance.

S204', the network equipment sends a downlink channel to the terminal equipment according to the second identifier.

And the terminal equipment receives the downlink channel from the network equipment according to the second identifier.

Specifically, the terminal device descrambles the downlink channel and the signal received from the network device by using the second identifier. Optionally, the second identifier is used as an input variable for initializing a random sequence, and the network device scrambles a downlink channel by using the random sequence.

In an optional implementation, the downlink channel includes a physical broadcast channel PBCH, and when the second identifier is a cell identifier dedicated to a cell, for example, a cell identifier carried by broadcast information or indicated by DMRS in the broadcast information, the downlink channel including the PBCH may be scrambled by the second identifier.

In yet another optional implementation, the downlink channel does not include PBCH. Here, the second identifier is a cell identifier specific to the terminal device. See in particular the description above.

And S204', the terminal equipment sends an uplink channel to network equipment according to the second identifier.

And the network equipment receives the uplink channel according to the second identifier.

Specifically, the terminal device scrambles the uplink channel and the signal sent to the network device by using the second identifier. Similarly, the second identifier is used as an input variable for initializing a random sequence, and the terminal device scrambles an uplink channel by using the random sequence.

The second identifier is the expanded cell ID, and the second identifier is one of 1008 or more identifiers, so that the number of random sequences formed by the second identifier is large, and the interference randomization effect is good, thereby improving the reliability of channel transmission.

The method can be applied to an NR LPWA system to configure the cell ID. But may also be applied to other systems, and is not limited herein. By adopting the scheme, the detection complexity in the synchronization process can be reduced, and the channel scrambling effect is better. The detection of 504 cell IDs can be supported in the synchronization process, and when channels such as PDSCH/PUSCH/PDCCH/PUCCH and the like are scrambled, 1008 and more cell IDs are supported.

According to the communication method provided by the embodiment of the application, the first identifier of the cell is detected in the synchronization process, the second identifier of the cell is further determined by the terminal device and used in the service transmission process, the first identifier is one of the N identifiers, the second identifier is one of the M identifiers, and M is greater than N, so that the complexity of synchronization detection can be reduced, and the reliability of channel transmission is improved.

In addition, in some embodiments, terminal devices of different capabilities may adopt different cell access policies.

For NR LPWA in-band (in-band) scenario deployment, as shown in fig. 3, there may be two terminal devices in the network:

the first is low-cost, low-complexity low-end terminal equipment, which is mainly used for low-rate, deep-coverage services. Such as cat.c in fig. 3.

The second is a medium-high terminal device with broadband capability, which is mainly used for services with medium-high rate and certain deep coverage capability. Such as cat.b and cat.a in fig. 3.

As can be seen from fig. 3, the low end terminal device performs cell access through LPWASS/PBCH, and performs narrowband service after the cell access. As shown in particular in fig. 4 a. The LPWASS/PBCH is NR-based SS/PBCH suitable for LPWA. The coverage performance of the synchronization signal is better than that of the common synchronization signal. After the lpwas/PBCH is introduced, for in-band deployment, there will be two kinds of synchronization signals, i.e. normal synchronization signal and lpwas/PBCH, on the system bandwidth.

As can also be seen from fig. 3, the medium-high end terminal device (especially cat.b shown in fig. 3) performs cell access through the broadband and/or narrowband SS/PBCH, and performs broadband service after the cell access. As shown in particular in fig. 4 b.

The following describes in detail the procedures of the low end terminal device and the medium end terminal device for acquiring the cell identifier respectively:

the low-end terminal device performs downlink synchronization through the narrowband synchronization signal, and detects to obtain a first identifier, where the first identifier is one of 504 cell identifiers. When random access is carried out, the cell identification is expanded into a second identification according to the coverage level, the second identification is one of 1008 cell identifications and more than 1008 cell identifications, and narrow-band service is carried out after access. As shown in fig. 5, the method includes at least one of the following steps (in some scenarios, one or more of the steps may not be performed):

s501, the terminal device detects the first synchronization signal, completes downlink time frequency synchronization and obtains a first identifier.

In this embodiment, the terminal device is a low-end terminal device, and the terminal device only has the capability of detecting the first synchronization signal. Here, "provided only" means that the capability of detecting the first and second synchronization signals is provided only with the capability of detecting the first synchronization signal, and is not provided with the capability of detecting the second synchronization signal.

And the terminal equipment completes downlink time-frequency synchronization through synchronous sequence detection. And detecting to obtain a first identifier, wherein the first identifier is one of the N identifiers. Since the first synchronization signal indicates the first identity, the terminal device may obtain the first identity by detecting the first synchronization signal. The value of N is small, for example, N is less than or equal to 504, so that the detection complexity is reduced, and the efficiency of detecting the synchronization signal is improved.

It should be noted that the flow and the embodiment shown in fig. 5 may be implemented independently, or may be further specifically described and implemented based on the above-mentioned embodiments of steps S201 to S204 ″. S501 is a cell search process, and is a further limitation to the partial method steps of steps S201 and S202.

And S502, the terminal equipment reads the system information.

The terminal device reads a Master Information Block (MIB), System Information (SI). The system information is used for subsequent random access, and the system information needed by residence and access in the cell is broadcast in the MIB and the SI.

S503, the terminal equipment completes uplink access.

And the terminal equipment is accessed to the network equipment according to the system information.

S504, the network device configures a second identifier for the terminal device according to the signal quality of the terminal device, and sends the second identifier to the terminal device.

The random access procedure may include at least one of steps S503 and S504. S504 is a further detailed description and implementation of step S203 of the embodiment shown in fig. 2.

The signal quality (e.g., Reference Signal Receiving Power (RSRP)) may reflect the coverage level of the terminal device. When the terminal device is at the edge, the interference during the channel transmission may be larger, and therefore, the cell identifier needs to be extended. The network device may determine whether to configure the extended cell ID according to the coverage level of the terminal device.

In step S504, the network device may also configure the terminal device with a second identifier according to other information, where the other information is related to a coverage level or a channel quality of the terminal device.

And S505, carrying out narrow-band uplink and downlink channel transmission between the network equipment and the terminal equipment. The step S505 is a channel transmission procedure. This step S505 is a further elaboration and implementation of steps S204' and S204 "of the embodiment shown in fig. 2.

Specifically, the terminal device descrambles the downlink channel and the signal received from the network device by using the second identifier. The second identifier is used as an input variable for initializing a random sequence, and the network equipment scrambles a downlink channel by using the random sequence. And the terminal equipment scrambles the uplink channel and the signal sent to the network equipment by adopting the second identifier. Similarly, the second identifier is used as an input variable for initializing a random sequence, and the terminal device scrambles an uplink channel by using the random sequence.

The low-end terminal equipment is mainly used for low-rate and deep-coverage services, and uplink and downlink channel transmission is carried out in a narrow band.

In this embodiment, a narrowband synchronization signal is used, so that the system resource efficiency is higher and the coverage capability is better. The synchronization process supports the detection of 504 cell IDs, and the detection complexity is reduced; and channel transmission is carried out according to the expanded cell identification, so that the channel interference randomization effect is improved, and the reliability of channel transmission is improved.

The middle-high terminal equipment can detect the second synchronization signal (broadband SS/PBCH block) firstly, detect the first synchronization signal (narrow-band SS/PBCH block) after the detection fails, and allocate resources to perform broadband service after synchronous access is performed through the first synchronization signal. As shown in fig. 6, the method includes at least one of the following steps (in some scenarios, one or more of the steps may not be performed):

s601, the terminal device detects a second synchronization signal.

In this embodiment, the terminal device is a medium-high terminal device, and the terminal device has a capability of detecting the second synchronization signal and/or the first synchronization signal.

And the third identifier corresponding to the second synchronization signal is one of K identifiers. K equals 1008.

S602, judging whether downlink synchronization is successful; if so, proceed to S603; otherwise, go to step S604.

Since the third identifier corresponding to the second synchronization signal is one of K identifiers, where K is equal to 1008, the detection complexity of the synchronization signal is improved, and the terminal device may fail to detect the second synchronization signal.

S603, if the terminal device detects the second synchronization signal successfully, the terminal device and the network device complete time-frequency synchronization, acquire a third identifier and acquire system information.

And searching and detecting the broadband SS/PBCH block, and reading the MIB and the SI if time-frequency synchronization is completed and a third identifier is obtained, wherein the third identifier is one of 0-1007 identifiers.

S604, if the downlink synchronization fails, the terminal device detects the first synchronization signal.

And if the broadband SS/PBCH block is tried to be detected for a plurality of times, starting to detect the narrowband SS/PBCH block.

In some other embodiments, the medium-high terminal device may also perform cell search by using the first synchronization signal and the second synchronization signal at the same time, that is, detect the first synchronization signal and the second synchronization signal at the same time, and identify the third identifier.

S605, the terminal equipment and the network equipment complete time-frequency synchronization, obtain a first identifier and read system information.

And obtaining a first identifier by detecting the first synchronization signal, wherein the first identifier is one of 0-503 identifiers. And reading the LPWA MIB and SI to complete the cell search.

It should be noted that the flow and the embodiment shown in fig. 6 are further specifically explained and implemented based on the example of the above steps S201 to S204 ″. Wherein, the cell search process may include at least one of the above-mentioned S601 to S605, and S601 to S605 are further limitations of the partial method steps of the above-mentioned steps S201 and S202.

S606, the terminal device detects the second synchronization signal, completes time frequency synchronization with the network device successfully, acquires the third identifier, and after acquiring system information, the terminal device initiates random access on the eMBB.

And the terminal equipment directly accesses the MIB and the SI on the eMBB after reading the MIB and the SI.

S607, the terminal device detects the failure of the second synchronous signal, detects the first synchronous signal, completes time-frequency synchronization, obtains the first identifier, and finishes uplink access with the network device after reading the system information.

After reading LPWAMIB and SI, the terminal equipment initiates random access on eMBB.

The random access procedure may include at least one of steps S606 and S607.

And S608, the network equipment configures a second identifier through the RAR according to the signal quality of the terminal equipment.

The network device configures the extended cell ID in the RAR as required, and can extend the cell ID to over 1008 cells.

Step S608 is a further detailed illustration and implementation of step S203 of the embodiment shown in fig. 2.

And S609, after the terminal equipment initiates random access on the eMBB, broadband uplink/downlink channel transmission is carried out between the terminal equipment and the network equipment.

And after the terminal equipment is accessed on the eMBB, carrying out broadband service.

S610, after S608, the network device configures the eMBB resource for the terminal device through RRC signaling.

The network equipment configures eMB broadband resources for the terminal equipment through the special signaling, and the terminal equipment carries out broadband uplink/downlink service according to the eMB broadband resources.

And S611, carrying out broadband uplink/downlink channel transmission between the terminal equipment and the network equipment.

Steps S609 to S611 are further detailed illustrations and implementations of steps S204 'and S204' of the embodiment shown in FIG. 2.

In this embodiment, the first narrowband synchronization signal is adopted, so that the detection performance is better, the coverage capability is stronger, the coverage is farther, the energy consumption is lower, and the user experience is improved.

In some further embodiments, there is provided a method of communication, the method comprising: the method comprises the steps that network equipment broadcasts broadcast information, and terminal equipment receives the broadcast information, wherein the broadcast information comprises a first identifier which is one of N identifiers; the network equipment notifies a second identifier to the terminal equipment after the terminal equipment accesses the cell, the terminal equipment determines the second identifier of the cell, and the second identifier is one of the M identifiers; wherein M is larger than N, and M, N are positive integers. That is, in this embodiment, the synchronization signal does not indicate the cell ID, which is all indicated by the broadcast information. The broadcast information refers to information transmitted by a broadcast method, and may be PBCH.

In this embodiment, the broadcast information carries the first identifier, and the terminal device further determines a second identifier of the cell, where the second identifier is used in the service transmission process, the first identifier is one of N identifiers, the second identifier is one of M identifiers, and M is greater than N, so that complexity of synchronization detection can be reduced, and reliability of channel transmission is improved.

The method of embodiments of the present invention is set forth above in detail and the apparatus of embodiments of the present invention is provided below.

Based on the same concept of the communication method in the foregoing embodiment, as shown in fig. 7, the embodiment of the present application further provides a communication apparatus 7000, which can be applied to the communication method shown in fig. 2, fig. 5, or fig. 6. The communication device 7000 may be the terminal device 200 shown in fig. 1, or may be a component (e.g., a chip) applied to the terminal device 200. The communication apparatus 7000 comprises the processing unit 71 and may further comprise a transceiving unit 72. Wherein:

the processing unit 71 is configured to detect a first synchronization signal;

the processing unit 71 is further configured to obtain a first identifier of a cell according to the first synchronization signal, where the first identifier is one of N identifiers;

the processing unit 71 is further configured to determine a second identifier of the cell, where the second identifier is one of the M identifiers;

wherein M is larger than N, and M, N are positive integers.

In another implementation manner, the transceiver unit 72 is configured to receive a downlink channel from the network device or send an uplink channel to the network device according to the second identifier.

In yet another implementation, the transceiver unit 72 is further configured to receive indication information from the network device, where the indication information is used to indicate the second identifier; or

The transceiver unit 72 is further configured to receive a second identifier from the network device; or

The processing unit 71 is further configured to determine the second identifier according to a preconfigured or defined rule.

In yet another implementation, the transceiver unit 72 is further configured to receive a demodulation reference signal in a broadcast message from the network device, where the demodulation reference signal is used to indicate the second identifier.

In yet another implementation, the transceiver unit 72 is further configured to receive a random access response from the network device, where the random access response includes the second identifier; or

The transceiving unit 72 is further configured to receive a radio resource control signaling or a media access control element, MAC CE, from the network device, where the radio resource control signaling or the MAC CE includes the second identifier; or

The transceiving unit 72 is further configured to receive broadcast information from the network device, wherein the broadcast information includes the second identifier.

In yet another implementation, the processing unit 71 is further configured to detect the second synchronization signal.

In yet another implementation, the processing unit 71 is further configured to obtain the third identifier according to the first synchronization signal and the second synchronization signal.

More detailed descriptions about the processing unit 71 and the transceiver unit 72 can be directly obtained by referring to the related descriptions of the terminal device in the method embodiments shown in fig. 2, fig. 5, or fig. 6, which are not repeated herein.

The above-mentioned transmitting/receiving unit may be an integrated unit having a transmitting/receiving function, or may be an independent receiving unit having a receiving function and a transmitting unit having a transmitting function, and may be logically referred to as "transmitting/receiving unit".

Based on the same concept of the communication method in the foregoing embodiment, as shown in fig. 8, the embodiment of the present application further provides a communication device 8000, which can be applied to the communication method shown in fig. 2, fig. 5 or fig. 6. The communication device 8000 may be the network device 100 shown in fig. 1, or may be a component (e.g., a chip) applied to the network device 100. The communication device 8000 includes: a transceiver unit 81. Wherein:

the transceiver unit 81 is configured to send a first synchronization signal, where the first synchronization signal corresponds to a first identifier of a first cell, and the first identifier is one of N identifiers;

the transceiver unit 81 is further configured to notify the terminal device of a second identifier, where the second identifier is a second identifier of the first cell, and the second identifier is one of M identifiers;

wherein M is greater than N, M, N are positive integers, and the first cell is a serving cell of the network device.

In yet another implementation, the transceiving unit 81 is further configured to send the second identifier to the terminal device; or the transceiver 81 is further configured to send indication information of the second identifier, where the indication information is used for the second identifier.

In yet another implementation, the transceiving unit 81 is further configured to send a random access response to the terminal device, where the random access response includes the second identifier; or

Sending a radio resource control signaling or MAC CE to the terminal equipment, wherein the radio resource control signaling or MAC CE comprises the second identifier; or

Sending broadcast information to the terminal equipment, wherein the broadcast information comprises the second identifier;

in yet another implementation manner, the transceiving unit 81 is further configured to transmit a demodulation reference signal of a broadcast message to the terminal device, where the demodulation reference signal is used to indicate the second identifier.

In yet another implementation manner, the transceiver unit 81 is further configured to send a downlink channel to the terminal device or receive an uplink channel from the terminal device according to the second identifier.

In yet another implementation, the transceiver unit 81 is further configured to transmit the second synchronization signal before transmitting the first synchronization signal.

In yet another implementation, the transceiver unit 81 is further configured to transmit the second synchronization signal at the same time as the first synchronization signal.

The more detailed description about the transceiver 81 can be directly obtained by referring to the related description of the network device in the method embodiment shown in fig. 2, fig. 5, or fig. 6, which is not repeated herein.

The embodiment of the application also provides a communication device, and the communication device is used for executing the communication method. Some or all of the above communication methods may be implemented by hardware or may be implemented by software.

Alternatively, the communication device may be a chip or an integrated circuit when embodied.

Optionally, when part or all of the communication method of the foregoing embodiment is implemented by software, the communication apparatus includes: a memory for storing a program; a processor for executing the program stored in the memory, when the program is executed, the communication apparatus may implement the communication methods provided by the terminal device and the network device in the embodiments shown in fig. 2, fig. 5 or fig. 6, respectively.

Alternatively, the memory may be a physically separate unit or may be integrated with the processor. The memory may also be used to store data.

Alternatively, when part or all of the communication method of the above embodiments is implemented by software, the communication apparatus may include only a processor. The memory for storing the program is located outside the communication device and the processor is connected to the memory by means of a circuit/wire for reading and executing the program stored in the memory.

The processor may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.

The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

The memory may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include a non-volatile memory (non-volatile memory), such as a flash memory (flash memory), a Hard Disk Drive (HDD) or a solid-state drive (SSD); the memory may also comprise a combination of memories of the kind described above.

It is to be understood that the units in the above-described respective communication device embodiments may also be referred to as modules.

Fig. 9 shows a simplified schematic diagram of a terminal device. For easy understanding and illustration, in fig. 9, the terminal device is exemplified by a mobile phone. As shown in fig. 9, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 8. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, an antenna and a radio frequency circuit having a transceiving function may be regarded as a receiving unit and a transmitting unit (which may also be collectively referred to as a transceiving unit) of a terminal device, and a processor having a processing function may be regarded as a processing unit of the terminal device. As shown in fig. 9, the terminal device includes a transceiver unit 91 and a processing unit 92. The transceiving unit 91 may also be referred to as a receiver/transmitter (transmitter), receiver/transmitter circuitry, etc. The processing unit 92 may also be referred to as a processor, a processing board, a processing module, a processing device, etc. The transceiver unit 91 is configured to implement the functions of the transceiver unit 72 in the embodiment shown in fig. 7, and the processing unit 92 is configured to implement the functions of the processing unit 71 in the embodiment shown in fig. 7.

For example, in one embodiment, the transceiving unit 91 is configured to perform the functions of the terminal device in steps S201, S203, and S204' or S204 ″ in the embodiment shown in fig. 2; and the processing unit 92 is adapted to perform step S202 in the embodiment shown in fig. 2.

Fig. 10 shows a simplified schematic diagram of a network device. The network device includes a radio frequency signal transceiving and converting part and a part 102, and the radio frequency signal transceiving and converting part includes a transceiving unit 101. The radio frequency signal receiving, transmitting and converting part is mainly used for receiving and transmitting radio frequency signals and converting the radio frequency signals and baseband signals; the 102 part is mainly used for baseband processing, network equipment control and the like. The transceiving unit 101 may also be referred to as a receiver/transmitter (transmitter), receiver/transmitter circuitry, etc. Portion 102 is typically a control center of the network device, which may be generally referred to as a processing unit, for controlling the source network device to perform the steps described above with respect to the network device in fig. 2, 5, or 6. Reference is made in particular to the description of the relevant part above. The transceiving unit 101 may be used to implement the functionality of the transceiving unit 101 in the embodiment shown in fig. 8.

Section 102 may include one or more boards, each of which may include one or more processors and one or more memories, the processors being configured to read and execute programs in the memories to implement baseband processing functions and control of network devices. If a plurality of single boards exist, the single boards can be interconnected to increase the processing capacity. As an alternative implementation, multiple boards may share one or more processors, multiple boards may share one or more memories, or multiple boards may share one or more processors at the same time.

For example, in one embodiment, the transceiving unit 101 is configured to perform the functions of the network device in steps S201, S203, and S204' or S204 ″ in the embodiment shown in fig. 2.

Embodiments of the present application also provide a computer-readable storage medium, in which a computer program or instructions are stored, and when the computer program or instructions are executed, the method of the above aspects is implemented.

Embodiments of the present application also provide a computer program product comprising instructions which, when executed on a computer, cause the computer to perform the method according to the above aspects.

The embodiment of the application also provides a communication system which comprises the communication device.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the division of the unit is only one logical function division, and other division may be implemented in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. The shown or discussed mutual coupling, direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some interfaces, and may be in an electrical, mechanical or other form.

Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on or transmitted over a computer-readable storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)), or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a read-only memory (ROM), or a Random Access Memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, such as a Digital Versatile Disk (DVD), or a semiconductor medium, such as a Solid State Disk (SSD).

Claims

1. A method of communication, the method comprising:

the terminal equipment detects a first synchronization signal;

the terminal equipment obtains a first identifier of a cell according to the first synchronization signal, wherein the first identifier is one of N identifiers;

the terminal equipment determines a second identifier of the cell, wherein the second identifier is one of the M identifiers;

the terminal equipment receives a downlink channel from the network equipment according to the second identifier and descrambles the received downlink channel according to the second identifier; alternatively, the first and second electrodes may be,

the terminal equipment scrambles an uplink channel according to the second identifier and sends the uplink channel to network equipment;

wherein M is greater than N, M, N are positive integers, N is less than or equal to 504, and M is greater than or equal to 1008.

2. The method of claim 1, wherein the determining, by the terminal device, the second identity of the cell comprises:

the terminal equipment receives indication information from the network equipment, wherein the indication information is used for indicating the second identifier; or

The terminal equipment receives a second identifier from the network equipment; or

And the terminal equipment determines the second identifier according to a rule configured or defined in advance.

3. The method of claim 2, wherein:

the terminal equipment receives the indication information from the network equipment, and the indication information comprises the following steps:

the terminal device receives a demodulation reference signal in a broadcast message from the network device, wherein the demodulation reference signal is used for indicating the second identifier;

or

The terminal device receiving the second identifier from the network device, including:

the terminal equipment receives a random access response from the network equipment, wherein the random access response comprises the second identifier;

the terminal equipment receives a radio resource control signaling or a media access control element (MAC CE) from the network equipment, wherein the radio resource control signaling or the MAC CE comprises the second identifier; or

The terminal device receives broadcast information from the network device, wherein the broadcast information comprises the second identifier.

4. The method according to any one of claims 1-2, wherein the terminal device has a first synchronization signal detection capability and/or a second synchronization signal detection capability, wherein the third identifier corresponding to the second synchronization signal is one of K identifiers, and K is less than or equal to 1008.

5. The method of claim 4, further comprising at least one of:

the terminal equipment detects the second synchronous signal;

and the terminal equipment acquires the third identifier according to the first synchronous signal and the second synchronous signal.

6. A method of communication, the method comprising:

the method comprises the steps that network equipment sends a first synchronization signal, wherein the first synchronization signal corresponds to a first identifier of a first cell, and the first identifier is one of N identifiers;

the network equipment informs a terminal equipment of a second identifier, wherein the second identifier is a second identifier of the first cell, and the second identifier is one of the M identifiers;

the network equipment scrambles a downlink channel according to the second identifier and sends the downlink channel to the terminal equipment; alternatively, the first and second electrodes may be,

the network equipment receives an uplink channel from the terminal equipment, wherein the uplink channel is scrambled by the second identifier;

wherein M is greater than N, M, N are both positive integers, the first cell is a serving cell of the network device, N is less than or equal to 504, and M is greater than or equal to 1008.

7. The method of claim 6, wherein the signal quality of the terminal device is below a first threshold.

8. The method of any of claims 6 to 7, wherein the network device informing the terminal device of the second identity comprises:

the network equipment sends the second identifier to the terminal equipment; or

And the network equipment sends the indication information of the second identifier to the terminal equipment, wherein the indication information is used for the second identifier.

9. The method of claim 8, wherein:

the network device sends the second identifier to the terminal device, including:

the network equipment sends a random access response to the terminal equipment, wherein the random access response comprises the second identifier;

the network equipment sends a radio resource control signaling or MAC CE to the terminal equipment, wherein the radio resource control signaling or MAC CE comprises the second identifier; or

The network equipment sends broadcast information to the terminal equipment, wherein the broadcast information comprises the second identifier; or

The network device sends the indication information of the second identifier to the terminal device, including:

and the network equipment sends a demodulation reference signal of a broadcast message to the terminal equipment, wherein the demodulation reference signal is used for indicating the second identifier.

10. The method according to any one of claims 6 to 7, wherein the terminal device has a first synchronization signal detection capability and/or a second synchronization signal detection capability, wherein the third identifier corresponding to the second synchronization signal is one of K identifiers, and K is less than or equal to 1008.

11. The method of claim 10, wherein prior to the network device transmitting the first synchronization signal, the method further comprises: the network equipment transmits the second synchronization signal; or

While the network device transmits the first synchronization signal, the method further comprises: the network device transmits the second synchronization signal.

12. A communications apparatus, the apparatus comprising: a processing unit and a transceiver unit; wherein:

the processing unit is used for detecting a first synchronization signal;

the processing unit is further configured to obtain a first identifier of a cell according to the first synchronization signal, where the first identifier is one of the N identifiers;

the processing unit is further configured to determine a second identifier of the cell, where the second identifier is one of the M identifiers;

the transceiver unit is configured to receive a downlink channel from a network device according to the second identifier;

the processing unit is further configured to descramble the received downlink channel according to the second identifier; alternatively, the first and second electrodes may be,

the processing unit is further configured to scramble an uplink channel according to the second identifier;

the transceiver unit is further configured to send the uplink channel to a network device;

13. The apparatus of claim 12, wherein:

the transceiver unit is further configured to receive indication information from the network device, where the indication information is used to indicate the second identifier; or

The transceiver unit is further configured to receive a second identifier from the network device; or

The processing unit is further configured to determine the second identifier according to a rule configured or defined in advance.

14. The apparatus of claim 13, wherein:

the transceiver unit is further configured to receive a demodulation reference signal in a broadcast message from the network device, where the demodulation reference signal is used to indicate the second identifier; or

The transceiver unit is further configured to receive a random access response from the network device, where the random access response includes the second identifier;

the transceiving unit is further configured to receive a radio resource control signaling or a media access control element, MAC CE, from the network device, where the radio resource control signaling or the MAC CE includes the second identifier; or

The transceiver unit is further configured to receive broadcast information from the network device, where the broadcast information includes the second identifier.

15. The apparatus according to any of claims 12 to 13, wherein the terminal device has a first synchronization signal detection capability and/or a second synchronization signal detection capability, wherein the third identifier corresponding to the second synchronization signal is one of K identifiers, and K is less than or equal to 1008.

16. The apparatus of claim 15, wherein:

the processing unit is further configured to detect the second synchronization signal; and/or

The processing unit is further configured to obtain the third identifier according to the first synchronization signal and the second synchronization signal.

17. A communications apparatus, the apparatus comprising: a transceiving unit and a processing unit; wherein:

the receiving and sending unit is configured to send a first synchronization signal, where the first synchronization signal corresponds to a first identifier of a first cell, and the first identifier is one of N identifiers;

the transceiver unit is further configured to notify a terminal device of a second identifier, where the second identifier is a second identifier of the first cell, and the second identifier is one of M identifiers;

the processing unit is configured to scramble the downlink channel according to the second identifier;

the transceiver unit is further configured to send the downlink channel to the terminal device; alternatively, the first and second electrodes may be,

the transceiver unit is further configured to receive an uplink channel from the terminal device, where the uplink channel is scrambled by the second identifier;

wherein M is greater than N, M, N are positive integers, the first cell is a serving cell of a network device, N is less than or equal to 504, and M is greater than or equal to 1008.

18. The apparatus of claim 17, wherein the signal quality of the terminal device is below a first threshold.

19. The apparatus of any one of claims 17 to 18, wherein:

the transceiver unit is further configured to send the second identifier to the terminal device; or

The transceiver unit is further configured to send, to the terminal device, indication information of the second identifier, where the indication information is used for the second identifier.

20. The apparatus of claim 19, wherein:

the transceiver unit is further configured to send a random access response to the terminal device, where the random access response includes the second identifier;

the transceiver unit is further configured to send a radio resource control signaling or an MAC CE to the terminal device, where the radio resource control signaling or the MAC CE includes the second identifier; or

The transceiver unit is further configured to send broadcast information to the terminal device, where the broadcast information includes the second identifier; or

The transceiver unit is further configured to send a demodulation reference signal of a broadcast message to the terminal device, where the demodulation reference signal is used to indicate the second identifier.

21. The apparatus according to any of claims 17 to 18, wherein the terminal device has a first synchronization signal detection capability and/or a second synchronization signal detection capability, wherein the third identifier corresponding to the second synchronization signal is one of K identifiers, and K is less than or equal to 1008.

22. The apparatus as claimed in claim 21, wherein said transceiver unit is further configured to transmit said second synchronization signal; or

The transceiver unit is further configured to transmit a first synchronization signal, and the apparatus further includes: the network device transmits the second synchronization signal.

23. A chip system, the chip system comprising a processor for supporting a terminal device to implement the communication method of any one of claims 1-5.

24. A chip system, the chip system comprising a processor for supporting a network device to implement the communication method of any one of claims 6 to 11.

25. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method of any one of claims 1-5 or the method of any one of claims 6-11.