CN116918416A

CN116918416A - Communication method and device

Info

Publication number: CN116918416A
Application number: CN202180093990.6A
Authority: CN
Inventors: 张云昊; 吴艺群
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-02-27
Filing date: 2021-02-27
Publication date: 2023-10-20
Also published as: WO2022178881A1

Abstract

The application discloses a communication method and a communication device. The access network equipment sends a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set, and sends a physical downlink control channel to the terminal on a candidate physical downlink control channel resource of the sub-resource set, and the narrowband terminal detects the physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set, so that the narrowband terminal can determine the frequency domain position of the candidate physical downlink control channel of the narrowband terminal in the broadband COESET, and the reliability of detecting the physical downlink control channel is improved.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

As shown in fig. 1, with the development of the technologies of internet of things and mass machine-type communication (mctc), the broadband terminal and the narrowband terminal access networks gradually exhibit a large number of characteristics, such as multiple forms, in various application scenarios such as home, industry, public places, etc. For example, in an industrial automation scenario, a large number of monitoring devices (monitoring device), machines (machines), sensors (sensors), etc. exist in one plant; for another example, in a family or living scenario, there are mobile phones, wearable devices, smart home appliances, car terminals, and the like. Among the multi-mode terminals, part of the terminals are wide bandwidth capability terminals, such as mobile phones, videos, augmented reality (augmented reality, AR)/Virtual Reality (VR) devices, etc., and the bandwidth capability may be 100MHz, 50MHz, 20MHz, etc.; part of terminals are narrow bandwidth capability terminals, such as sensors, wearable devices, etc., and the bandwidth capability may be 5MHz, 2MHz, etc.

The broadband terminal can determine a candidate physical downlink control channel (physical downlink control channel candidate, PDCCH candidate) through the existing initial access procedure, and receive the PDCCH on a time-frequency resource corresponding to the candidate PDCCH. However, since the bandwidth range of the narrowband terminal received is smaller than that of the wideband terminal, the prior art is only applicable to the wideband terminal, and does not consider how the narrowband terminal receives the PDCCH, so it is necessary to provide a receiving method of the PDCCH that can be used for the narrowband terminal, so as to improve the reliability of detecting the PDCCH.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for solving the problem of how to determine the frequency domain position of a candidate physical downlink control channel of a narrowband terminal in a broadband control resource set by the narrowband terminal and improving the reliability of detecting the physical downlink control channel.

In a first aspect, a communication method is provided, the method comprising: the method comprises the steps that a terminal receives a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set; and the terminal detects the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set. In this aspect, the terminal receives a first message sent by the access network device, where the first message includes frequency domain information of a control resource set and location information of a sub-resource set, and detects a physical downlink control channel on a candidate physical downlink control channel resource of the sub-resource set, so that a frequency domain location of the candidate physical downlink control channel of the terminal can be determined in the control resource set, and reliability of detecting the physical downlink control channel is improved. The terminal may be a narrowband terminal or a wideband terminal.

In one possible implementation, the access network device determines location information for a set of sub-resources in the set of control resources before sending the first message, and then generates the first message. The set of control resources may be, for example, the set of control resources of the aforementioned broadband terminal.

In yet another possible implementation, the location information of the set of sub-resources includes at least one of: and the frequency domain initial position information of the sub-resource set in the control resource set, and the frequency resource size information of the sub-resource set. In this implementation, the terminal determines the frequency location of the candidate physical downlink control channel in the control resource set, so the location information of the sub-resource set includes frequency domain starting location information of the sub-resource set in the control resource set and/or frequency resource size information of the sub-resource set in the control resource set.

In yet another possible implementation, the frequency domain starting location information is an index of a starting control channel unit corresponding to the sub-resource set, and the frequency resource size information is an aggregation level or a maximum aggregation level corresponding to the candidate physical downlink control channel. Therefore, the candidate physical downlink control channel of the terminal can be determined according to the index of the initial control channel unit corresponding to the sub-resource set, the aggregation level corresponding to the candidate physical downlink control channel or the maximum aggregation level.

In yet another possible implementation, the frequency resource size information is an aggregation level corresponding to the candidate physical downlink control channel, and the detecting the physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set includes: and starting from the frequency domain starting position of the sub-resource set in the control resource set, and detecting the physical downlink control channel on the frequency domain resource corresponding to the aggregation level.

In yet another possible implementation, the frequency resource size information is a maximum aggregation level corresponding to the candidate physical downlink control channel, and the detecting the physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set includes: and starting from the frequency domain starting position of the sub-resource set in the control resource set, detecting the physical downlink control channel on the frequency domain resource corresponding to each aggregation level which is smaller than or equal to the maximum aggregation level. Therefore, when the frequency resource size information of the sub-resource set can also be the maximum AL corresponding to the candidate physical downlink control channel, the terminal starts from the initial CCE of the sub-resource set in CORESET#0, and detects the physical downlink control channel on the frequency domain resource corresponding to each AL which is smaller than or equal to the maximum AL, so as to accurately detect the physical downlink control channel.

In a second aspect, there is provided a communication method, the method comprising: the access network equipment sends a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set; and the access network equipment sends the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set. In this aspect, the access network device sends a first message, where the first message includes frequency domain information of the control resource set and location information of the sub-resource set, and sends a physical downlink control channel to the terminal on a candidate physical downlink control channel resource of the sub-resource set, and the narrowband terminal detects the physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set, so that the narrowband terminal can determine the frequency domain location of the candidate physical downlink control channel of the narrowband terminal in the wideband CORESET, and reliability of detecting the physical downlink control channel is improved.

In one possible implementation, the location information of the set of sub-resources includes at least one of: and the frequency domain initial position information of the sub-resource set in the control resource set, and the frequency resource size information of the sub-resource set.

In yet another possible implementation, the frequency domain starting location information is an index of a starting control channel unit corresponding to the sub-resource set, and the frequency resource size information is an aggregation level or a maximum aggregation level corresponding to the candidate physical downlink control channel.

With reference to the first aspect or the second aspect or any implementation of the first aspect or the second aspect, in a further possible implementation, the frequency domain start position information is frequency domain start resource block position information of the sub-resource set, and the frequency resource size information is a number of resource blocks of the sub-resource set. Therefore, the terminal can accurately determine the candidate physical downlink control channel of the terminal according to the frequency domain initial resource block position information of the sub-resource set and the number of the resource blocks of the sub-resource set.

With reference to the first aspect or the second aspect or any implementation of the first aspect or the second aspect, in a further possible implementation, the control resource set includes one or more frequency domain parts, and the location information of the sub-resource set is location information of the frequency domain part where the sub-resource set is located. In this implementation, the physical downlink control channel may be accurately detected in the frequency domain portion that the terminal indicated by the first message needs to detect.

With reference to the first aspect or the second aspect or any implementation of the first aspect or the second aspect, in a further possible implementation, a first set of bits in the first message is used to indicate location information of the set of sub-resources, where the first set of bits includes bits in a physical broadcast channel. The position information of the sub-resource set can be accurately indicated through reserved bits in the PBCH defined by the existing protocol or part of bits in the newly defined PBCH, so that the utilization rate of resources is improved.

With reference to the first aspect or the second aspect or any implementation of the first aspect or the second aspect, in a further possible implementation, the first bit set is used to indicate an entry in a preset table, where the preset table includes one or more entries, and each entry includes frequency domain starting position information and frequency resource size information of one sub-resource set.

With reference to the first aspect or the second aspect or any implementation of the first aspect or the second aspect, in a further possible implementation, the preset table is an entry that extends laterally or longitudinally based on a table for indicating a set of control resources.

In a third aspect, there is provided a communication device for performing the method of the first aspect or any of the possible implementations of the first aspect. The communication means may be a terminal in the above-described first aspect or any possible implementation of the first aspect, or a module applied in a terminal, such as a chip or a chip system. The communication device comprises a corresponding module, unit or means (means) for realizing the method, and the module, unit or means can be realized by hardware, software or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the functions described above.

With reference to the third aspect, in one possible implementation manner, the communication apparatus includes: a transceiver unit and a processing unit; the receiving and transmitting unit is used for receiving a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set; and the processing unit is used for detecting the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.

Optionally, the location information of the sub-resource set includes at least one of the following information: and the frequency domain initial position information of the sub-resource set in the control resource set, and the frequency resource size information of the sub-resource set.

Optionally, the frequency domain starting position information is an index of a starting control channel unit corresponding to the sub-resource set, and the frequency resource size information is an aggregation level or a maximum aggregation level corresponding to the candidate physical downlink control channel.

Optionally, the frequency resource size information is an aggregation level corresponding to the candidate physical downlink control channel, and the processing unit is configured to detect the physical downlink control channel on a frequency domain resource corresponding to the aggregation level, starting from a frequency domain starting position of the sub-resource set in the control resource set;

The frequency resource size information is a maximum aggregation level corresponding to the candidate physical downlink control channel, and the processing unit is configured to detect the physical downlink control channel on a frequency domain resource corresponding to each aggregation level less than or equal to the maximum aggregation level, from a frequency domain starting position of the sub-resource set in the control resource set.

With reference to the third aspect, in a further possible implementation manner, the communication apparatus includes: an input interface, an output interface, and a processing circuit; the input interface is configured to receive a first message, where the first message includes frequency domain information of a control resource set and location information of a sub-resource set; and the processing circuit is used for detecting the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.

Optionally, the frequency resource size information is an aggregation level corresponding to the candidate physical downlink control channel, and the processing circuit is configured to detect the physical downlink control channel on a frequency domain resource corresponding to the aggregation level, starting from a frequency domain starting position of the sub-resource set in the control resource set;

the frequency resource size information is a maximum aggregation level corresponding to the candidate physical downlink control channel, and the processing circuit is used for detecting the physical downlink control channel on frequency domain resources corresponding to each aggregation level smaller than or equal to the maximum aggregation level from a frequency domain starting position of the sub-resource set in the control resource set.

Illustratively, the communication device further comprises a memory coupled to the at least one processor for executing program instructions stored in the memory to cause the communication device to perform the method of the first aspect or any one of the possible implementations of the first aspect.

In one possible implementation, the memory is used to store program instructions and data. The memory is coupled to the at least one processor, which may invoke and execute program instructions stored in the memory to cause the communication device to perform the method of the first aspect or any possible implementation of the first aspect.

Illustratively, the communications apparatus further comprises a communications interface for the communications apparatus to communicate with other devices. When the communication device is a terminal, the communication interface is a transceiver, an input/output interface, or a circuit.

In one possible design, the communication device includes: at least one processor and a communication interface for performing the method of the first aspect or any of the possible implementations of the first aspect, in particular comprising: the at least one processor communicates with the outside using the communication interface; the at least one processor is configured to run a computer program to cause the communication device to perform the method of the first aspect or any of the possible implementations of the first aspect. It will be appreciated that the external portion may be an object other than the processor or other than the communication device.

In another possible design, the communication device is a chip or a system-on-chip. The communication interface may be an input/output interface, interface circuitry, output circuitry, input circuitry, pins or related circuitry, etc. on the chip or system-on-chip. The processor may also be embodied as processing circuitry or logic circuitry.

The technical effects caused by any one of the design manners in the third aspect may be referred to the technical effects caused by the different design manners in the first aspect, which are not described herein.

In a fourth aspect, there is provided a communications device for performing the method of the second aspect or any one of the possible implementations of the second aspect. The communication means may be an access network device in the second aspect or any possible implementation of the second aspect, or a module applied in an access network device, such as a chip or a chip system. The communication device comprises a module, a unit or means for realizing the method, wherein the module, the unit or the means can be realized by hardware, software or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the functions described above.

With reference to the fourth aspect, in one possible implementation manner, the communication apparatus includes: a transmitting/receiving unit; the receiving and transmitting unit is used for sending a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set; and the transceiver unit is further configured to send a physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.

With reference to the fourth aspect, in a further possible implementation manner, the communication apparatus includes: an input interface, an output interface, and a processing circuit; the output interface is configured to send a first message, where the first message includes frequency domain information of a control resource set and location information of a sub-resource set; and the output interface is further configured to send a physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set.

Illustratively, the communication device further comprises a memory coupled to the at least one processor for executing program instructions stored in the memory to cause the communication device to perform the method of the second aspect or any one of the possible implementations of the second aspect.

In one possible implementation, the memory is used to store program instructions and data. The memory is coupled to the at least one processor, which may invoke and execute program instructions stored in the memory to cause the communication device to perform the method of the second aspect or any possible implementation of the second aspect described above.

Illustratively, the communications apparatus further comprises a communications interface for the communications apparatus to communicate with other devices. When the communication device is an access network device, the communication interface is a transceiver, an input/output interface, or a circuit.

In one possible design, the communication device includes: at least one processor and a communication interface for performing the method of the second aspect or any of the possible implementations of the second aspect, in particular comprising: the at least one processor communicates with the outside using the communication interface; the at least one processor is configured to run a computer program to cause the communication device to perform the method of the second aspect or any one of the possible implementations of the second aspect. It will be appreciated that the external portion may be an object other than the processor or other than the communication device.

The technical effects of any one of the design manners in the fourth aspect may be referred to the technical effects of the different design manners in the second aspect, which are not described herein.

With reference to the third aspect or the fourth aspect or any implementation of the third aspect or the fourth aspect, in a further possible implementation, the frequency domain start position information is frequency domain start resource block position information of the sub-resource set, and the frequency resource size information is a number of resource blocks of the sub-resource set.

With reference to the third aspect or the fourth aspect or any implementation of the third aspect or the fourth aspect, in a further possible implementation, the control resource set includes one or more frequency domain parts, and the location information of the sub-resource set is location information of the frequency domain part where the sub-resource set is located.

With reference to the third aspect or the fourth aspect or any implementation of the third aspect or the fourth aspect, in a further possible implementation, a first set of bits in the first message is used to indicate location information of the set of sub-resources, where the first set of bits includes bits in a physical broadcast channel.

With reference to the third aspect or the fourth aspect or any implementation of the third aspect or the fourth aspect, in a further possible implementation, the first bit set is used to indicate an entry in a preset table, where the preset table includes one or more entries, and each entry includes frequency domain starting position information and frequency resource size information of one sub-resource set.

In a fifth aspect, there is provided a communication system comprising a communication device in any implementation of the third aspect or the third aspect, and a communication device in any implementation of the fourth aspect or the fourth aspect.

In a sixth aspect, there is provided a computer readable storage medium storing a computer program which, when run on a computer, performs the method of any one of the aspects or aspects described above.

In a seventh aspect, there is provided a computer program product which, when run on a computer, causes any one of the above aspects or aspects to be carried out.

In an eighth aspect, there is provided a computer program which, when run on a computer, causes any one of the above aspects or aspects to be carried out.

Drawings

FIG. 1 is a schematic diagram of a broadband terminal and a narrowband terminal access network;

fig. 2 is a schematic flow chart of initial access of a broadband terminal;

fig. 3 is a schematic diagram of an internal structure of a synchronization signal/physical broadcast channel block;

FIG. 4 is a diagram showing the mapping of CCEs and REGs in CORESET#0;

fig. 5 is a schematic diagram of a communication system according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device 400 according to an embodiment of the present application;

fig. 7 is a schematic flow chart of a communication method according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating an indication of location information of a sub-resource set according to an embodiment of the present application;

FIG. 9 is a schematic diagram illustrating an indication of location information of a further set of seed resources according to an example embodiment of the present application;

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

fig. 11 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a simplified terminal according to an embodiment of the present application;

Fig. 13 is a schematic structural diagram of a simplified access network device according to an embodiment of the present application.

Detailed Description

Through the initial access procedure, the wideband terminal can detect the candidate physical downlink control channel at any bandwidth position in coreset#0. The initial access procedure of the broadband terminal is briefly described as follows.

The purpose of the initial access is mainly to obtain the downlink synchronization with the base station and the system information of the cell where the terminal is located.

As shown in fig. 2, a schematic flow chart of initial access of a broadband terminal is shown. In the resource diagram of fig. 2 where the synchronization signal block (synchronization signal block, SSB) is located, the horizontal axis is the time domain, and the units may be subframes, slots, minislots, symbols, etc., where the units of the horizontal axis are slots; the vertical axis is the frequency domain, and the unit may be a subcarrier, a bandwidth part (BWP), or the like, where the unit of the vertical axis is a subcarrier. The initial access process mainly comprises the following steps:

step one: the terminal tries one by one at a plurality of frequency domain positions, and realizes downlink synchronization with the base station and acquires SSB by detecting symbol by symbol of the synchronization sequence at each frequency domain position. The SSB includes a primary synchronization signal (primary synchronization signal, PSS), a secondary synchronization signal (secondary synchronization signal, SSS), and a physical broadcast channel (physical broadcast channel, PBCH), and the structure thereof is shown in fig. 3. In fig. 3, the left-hand digit indicates the frequency domain location in Resource Element (RE), i.e. one subcarrier in the frequency domain; the right-hand figure shows that when subcarrier spacing (SCS) =15 kHz, PSS/SSS occupies a bandwidth of 1.92MHz and pbch occupies a bandwidth of 3.6MHz; alternatively, the right-hand numbers indicate that PSS/SSS occupy 3.84MHz and pbch occupy 7.2MHz when scs=30 kHz.

Step two: the terminal acquires a master information block (master information block, MIB) from the PBCH. Details of the PBCH and MIB are set forth below.

Step three: the terminal determines the common search space (common search space, CSS), two slots indicated by the arrow in fig. 2, from the physical downlink control channel-ConfigSIB 1 field in the MIB, and determines CORESET #0. Wherein, CSS is used for the terminal to determine the time position where coreset#0 exists, coreset#0 is used for the terminal to determine the time-frequency resource range for retrieving the physical downlink control channel (physical downlink control channel ). A specific configuration of CORESET #0 will be set forth later.

Step four: the DCI scrambled by the SI-RNTI is blind detected from the time-frequency resource determined by CORESET #0 and CSS in step three, and a method of blind detection will be described later.

Step five: based on the indication of the DCI, system information, e.g., system information block (system information block, SIB) 1, is acquired in a timeslot. The terminal may obtain configuration information of the initial bandwidth part, and configuration information of random access resources, configuration information of paging resources, etc. from SIB 1.

PBCH and MIB

The payload (payload) of the PBCH includesWherein, A total of a bits are used to carry MIB information,a total of 8 are used to carry other information. The MIB information content is shown in table 1:

TABLE 1 meaning and number of bits of each field in MIB

Among the 8-bit information indicated by PDCCH-ConfigSIB1, the 4-bit information is the indication information of CSS, and the 4-bit information is the indication information of coreset#0, which all obtain specific parameters by searching a corresponding table in the protocol. The frequency range of CORESET #0 includes three parameters of 24RB, 48RB, 96RB, where 96RB supports SCS of only 15kHz, 24RB, 48RB supports SCS of 15kHz or 30 kHz. The time domain range of CORESET #0 includes three parameters of 1 symbol, 2 symbols, and 3 symbols.

Wherein,a total of 8 bits are used to indicate the following information:

1) is the lower four bits of the system frame number, indicating the system frame number along with the systemFrameNumber field in the MIB (10 bits total).

2) As field indicationIndicating whether the synchronization signal/physical broadcast channel block burst (SSBburst) is located in the first half of a frame or the second half of a frame.

3) The remaining three bitsAccording to the difference of the frequency band and the subcarrier spacing of the SSB, the method is used according to the following rules:

a) In the Frequency Range (FR) 1 frequency band<6 GHz), the number of SSBs in SSBburst is at most 4 when the subcarrier spacing of SSBs is 15 kHz; when the subcarrier spacing of SSBs is 30kHz, the number of SSBs in SSBburst is at most 8, Is k _SS/PBCHblock Is used for the most significant bit of the (c),and (5) reserving.

b) In FR2 frequency band>24 GHz) licensed spectrum, the number of SSBs in SSBburst is at most 64,is the top three bits of information indicating the SSB index (index).

In accordance with the above description of the present application,in total 8 bits, there is a reserved field of 0-2 bits according to the frequency band. In the present application, it is contemplated that other information may be indicated using these several reserved bits, and/or the spark field in the MIB.

Physical downlink control channel

CSS is used for the terminal to determine the time position where coreset#0 exists, and coreset#0 is used for the terminal to determine the time-frequency resource range where the physical downlink control channel is retrieved, i.e. the time-frequency resource position of the candidate physical downlink control channel can be determined in coreset#0. The terminal detects the candidate physical downlink control channel, descrambles the data on the candidate physical downlink control channel, and determines whether DCI which needs to be received is present on the candidate physical downlink control channel.

In CORESET #0, the bundling size (REG bundle size) of the resource unit group is specified to be 6, and the time-frequency resources of the REG bundle are three kinds: 1 symbol x 6 resource element group (resource element group, REG), 2 symbol x 3REG,3 symbol x 2REG. Where REG is a physical resource unit where the time domain occupies one orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol and the frequency domain occupies one Resource Block (RB). REG bundle is 1, 2, 3, 6 REGs that are contiguous in time and/or frequency domain.

A control-channel element (CCE) is a basic element constituting a candidate physical downlink control channel, occupies 6 REGs, and one candidate physical downlink control channel may be composed of 1, 2, 4, 8, 16 CCEs, which is called an aggregation level (aggregation level, AL). CORESET #0 specifies al=4, 8, 16.

It can be understood that REG is a concept on resources and CCE is a concept of an element of a candidate physical downlink control channel. Thus, it can be considered how CCEs are mapped onto REG resources. CCE mapping to REG presence determination rules include non-interleaving based mapping and interleaving based mapping. In CORESET #0, CCE and REG are specified to be based on interleaving mapping, and the interleaving rule is:

x＝cR+r

r＝0,1,…,R-1

c＝0,1,…,C-1

wherein, for CORESET #0, l=6, r=2, andthe table look-up indication is sent through a physical downlink control channel-ConfigSIB 1 signaling in the MIB. Wherein the selectable frequency range of CORESET #0Is thatThe selectable time domain range of CORESET #0 isAnd a symbol. An exemplary CORESET #0 is shown in table 2 below:

TABLE 2

Search rule of candidate physical downlink control channel in CORESET #0

According to the description above, for CORESET #0Three cases, andthe three cases of symbols are arranged by REG bundle of 9 cases in total, and the corresponding relation between REG bundle and CCE index is arranged, as shown in FIG. 4. In fig. 4, the vertical direction represents the frequency domain (one lattice represents 1 RB), and the horizontal direction represents the time domain (one lattice represents 1 symbol). The effect produced is assumed to be 0.

In fig. 4, CCE Index corresponding to each REG bundle is marked on the right side. When determining the candidate physical downlink control channel, the UE considers 4, 8 or 16 CCEs with consecutive indexes of CCEs as one candidate physical downlink control channel. To be used forAnd is also provided with(second column of fig. 4) for example, when the terminal tries al=4, the terminal considers that CCEs of index=0, 1, 2, 3 constitute one candidate physical downlink control channel, and CCEs of index=4, 5, 6, 7 constitute another candidate physical downlink control channel. At this time, the frequency domain bandwidth occupied by the candidate physical downlink control channel is 6REG bundle (including the bandwidths of CCEs numbered 0, 2, 4, 6, 1, 3, or the bandwidths of CCEs numbered 4, 6, 1, 3, 5, 7). The number of RBs occupied by the candidate physical downlink control channel in each case is shown in table 3 below:

TABLE 3 Table 3

When scs=15 kHz, the corresponding bandwidths of the candidate physical downlink control channels are shown in the following table 4:

TABLE 4 Table 4

When scs=30 kHz, the corresponding bandwidths of the candidate physical downlink control channels are shown in the following table 5:

TABLE 5

Wherein, the portions of the bands in tables 4 and 5 that are greater than 2MHz and less than or equal to 5MHz represent the situation that a narrowband terminal with 5MHz bandwidth capability can receive a candidate physical downlink control channel; the portions of the bandwidths less than or equal to 2MHz in tables 4 and 5 represent cases where a narrowband terminal with 2MHz bandwidth capability can receive a candidate physical downlink control channel.

The wideband terminal may retrieve the candidate physical downlink control channel at any bandwidth location in CORESET # 0. However, since the bandwidth range of the narrowband terminal reception is smaller than that of the wideband terminal, the above method is applicable only to the wideband terminal, and does not consider how the narrowband terminal receives the PDCCH. For the narrowband terminal, even if the bandwidth of the candidate physical downlink control channels does not exceed the bandwidth capability of the narrowband terminal, the physical downlink control channels sent by the access network device may not be in the bandwidth range searched by the narrowband terminal because the narrowband terminal does not know the specific frequency domain position where the candidate physical downlink control channels are located. A narrowband terminal may only acquire candidate physical downlink control channels within its bandwidth capability at one time opportunity, resulting in a possible failure to receive a physical downlink control channel transmitted by the access network device.

The application provides a communication scheme, an access network device sends a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set, and sends a physical downlink control channel to a terminal on a candidate physical downlink control channel resource of the sub-resource set, and a narrowband terminal detects the physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set, so that the narrowband terminal can determine the frequency domain position of the candidate physical downlink control channel of the narrowband terminal in a broadband COESET, and the reliability of detecting the physical downlink control channel is improved.

The technical scheme of the embodiment of the application can be applied to various communication systems. For example: a long term evolution (long term evolution, LTE) system, an LTE frequency division duplex (frequency division duplex, FDD) system, an LTE time division duplex (time division duplex, TDD) system, an LTE-advanced (enhanced long term evolution, elet), a fifth generation (5th generation,5G) system, or NR, etc., and a 5G mobile communication system according to the present application includes a non-independent Networking (NSA) 5G mobile communication system or an independent networking (SA) 5G mobile communication system. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system. The communication system may also be a public land mobile network (public land mobile network, PLMN) network, a device-to-device (D2D) communication system, a machine-to-machine (machine to machine, M2M) communication system, an internet of things (internet of things, ioT), an internet of vehicles communication system, or other communication system.

Fig. 5 is a schematic structural diagram of a communication system to which an embodiment of the present application is applicable. The communication system may comprise at least one access network device 100 (only 1 is shown in the figure) and one or more narrowband terminals 200 (only 1 is shown in the figure) connected to the access network device 100, and may further comprise one or more wideband terminals 300 (only 1 is shown in the figure) connected to the access network device 100. The access network device transmits SSBs and the like on #1 to #4 beams, and the broadband terminal and/or the narrowband terminal receives SSBs on any one or more of #1 to #4 beams.

Optionally, the broadband terminal in the embodiment of the present application refers to a terminal that can obtain system information by using an initial access network defined by a 3GPP existing NR standard (for example, 3GPP Release 15 or 3GPP Release 16), where the bandwidth capability is greater than or equal to 100MHz; or the broadband terminal may be an initial access network, a terminal acquiring system information, which may be defined by the 3gpp Release 17 standard, and its bandwidth capability is greater than or equal to 20MHz. The narrowband terminal in the embodiment of the application refers to a terminal which cannot fully utilize the existing standard initial access network and acquire system information, and the bandwidth capacity of the terminal can be 5MHz, 2MHz and the like.

By way of example, but not limitation, in the embodiments of the present application, the wearable device may also be referred to as a wearable intelligent device, which is a generic term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, apparel, shoes, and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the application, the narrowband terminal can also be a terminal in an IoT system, and the IoT is an important component of the development of future information technology, and the main technical characteristics of the narrowband terminal are that the article is connected with a network through a communication technology, so that the man-machine interconnection and the intelligent network of the article interconnection are realized. In the embodiment of the application, the IoT technology can achieve mass connection, deep coverage and terminal power saving through, for example, a Narrowband (NB) technology.

In addition, in the embodiment of the application, the narrowband terminal can also comprise sensors such as an intelligent printer, a train detector, a gas station and the like, and the main functions comprise collecting data (part of the terminal), receiving control information and downlink data of the access network equipment, transmitting electromagnetic waves and transmitting uplink data to the access network equipment.

Optionally, the broadband terminal in the embodiment of the present application may specifically be an access terminal, a subscriber unit, a subscriber station, a mobile station, a relay station, a remote terminal, a mobile device, a user terminal (UE), a terminal (terminal), a wireless communication device, a user agent, a user equipment, a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with a wireless communication function, a computing device, or other processing device connected to a wireless modem, a vehicle-mounted device, a terminal in a 5G network, or a terminal in a PLMN that is evolved in the future, or a terminal in a car network in the future, and the embodiment of the present application is not limited thereto.

By way of example and not limitation, in embodiments of the present application, the broadband terminal may be a cell phone, tablet computer, computer with wireless transceiver function, virtual reality terminal, augmented reality terminal, wireless terminal in industrial control, wireless terminal in unmanned operation, wireless terminal in teleoperation, wireless terminal in smart grid, wireless terminal in transportation security, wireless terminal in smart city, wireless terminal in smart home, etc.

Alternatively, the access network device in the embodiment of the present application may be any communication device having a wireless transceiver function for communicating with a narrowband terminal and a wideband terminal. The access network device includes, but is not limited to: an evolved node B (eNB), a baseband unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (transmission point, TP), or a transmission reception point (transmission reception point, TRP), and so on. The access network device may also be a gNB or TRP or TP in a 5G system, or one or a group (including multiple antenna panels) of base stations in a 5G system. Furthermore, the access network device may be a network node, such as a BBU, or a Distributed Unit (DU), etc., constituting the gNB or TP.

In some deployments, the gNB may include a Centralized Unit (CU) and DUs. Furthermore, the gNB may also comprise active antenna units (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB. For example, the CU is responsible for handling non-real time protocols and services, implementing the functions of the radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer. The DUs are responsible for handling physical layer protocols and real-time services, and implement the functions of a radio link control (radio link control, RLC), medium access control (media access control, MAC) and physical layer (PHY). The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer eventually becomes information of the PHY layer or is converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by DUs or by DUs and AAUs. It is understood that the access network device may be a device comprising one or more of a CU node, a DU node, an AAU node.

Optionally, in the embodiment of the present application, the access network device and the broadband terminal may communicate through licensed spectrum, may also communicate through unlicensed spectrum, or may communicate through licensed spectrum and unlicensed spectrum at the same time. The access network device and the broadband terminal can communicate with each other through a frequency spectrum below 6 gigahertz (GHz), can also communicate through a frequency spectrum above 6GHz, and can also communicate by using the frequency spectrum below 6GHz and the frequency spectrum above 6GHz at the same time. The embodiment of the application does not limit the spectrum resources used between the access network equipment and the broadband terminal.

Alternatively, the terminal or the access network device in the embodiment of the present application may be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; the device can be deployed on the water surface; but also on aerial planes, balloons and satellites. The embodiment of the application does not limit the application scene of the terminal or the access network equipment.

Optionally, in an embodiment of the present application, the terminal or the access network device includes a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided in the embodiment of the present application, and may be capable of performing communication according to the method provided in the embodiment of the present application by executing a program recorded with a code of the method provided in the embodiment of the present application, for example, the execution body of the method provided in the embodiment of the present application may be a terminal or an access network device, or may be a functional module in the terminal or the access network device capable of calling a program and executing the program.

In other words, the related functions of the terminal or the access network device in the embodiment of the present application may be implemented by one device, or may be implemented by multiple devices together, or may be implemented by one or more functional modules in one device, which is not specifically limited in the embodiment of the present application. It will be appreciated that the above described functionality may be either a network element in a hardware device, or a software functionality running on dedicated hardware, or a combination of hardware and software, or a virtualized functionality instantiated on a platform (e.g., a cloud platform).

For example, the related functions of the terminal or the access network device in the embodiment of the present application may be implemented by the communication apparatus 400 in fig. 6. Fig. 6 is a schematic structural diagram of a communication device 400 according to an embodiment of the present application. The communication device 400 includes one or more processors 401, 407, a communication line 402, and at least one communication interface (illustrated in fig. 6 by way of example only as including a communication interface 404). Optionally, a memory 403 may also be included.

The processor 401 may be a CPU, microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

Communication line 402 may include a passageway for connecting between the various components.

The communication interface 404, which may be a transceiver module, is used to communicate with other devices or communication networks, such as ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc. For example, the transceiver module may be a device such as a transceiver, or the like. Alternatively, the communication interface 404 may be a transceiver circuit located in the processor 401, so as to implement signal input and signal output of the processor.

The memory 403 may be a device having a memory function. For example, but not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via communication line 402. The memory may also be integrated with the processor.

The memory 403 is used for storing computer-executable instructions for performing the inventive arrangements, and is controlled by the processors 401, 407. The processors 401, 407 are configured to execute computer-executable instructions stored in the memory 403, thereby implementing the communication method provided in the embodiment of the present application.

Alternatively, in the embodiment of the present application, the processors 401 and 407 may execute the functions related to the processing in the communication method provided in the embodiment of the present application, and the communication interface 404 is responsible for communicating with other devices or communication networks, which is not specifically limited in the embodiment of the present application.

Computer-executable instructions in embodiments of the application may also be referred to as application code, and embodiments of the application are not limited in this regard.

In a specific implementation, as an embodiment, the processors 401, 407 may include one or more CPUs, respectively, for example, in fig. 6, the processor 401 includes CPU0 and CPU1, and the processor 407 includes CPU0 and CPU1.

In a particular implementation, as one embodiment, the communication apparatus 400 may include a plurality of processors, such as the processor 401 and the processor 407 in fig. 6. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In a specific implementation, as an embodiment, the communication apparatus 400 may further include an output device 405 and an input device 406. The output device 405 communicates with the processor 401 and may display information in a variety of ways.

The communication device 400 may be a general-purpose device or a special-purpose device. For example, the communication apparatus 400 may be a desktop, a portable computer, a web server, a palm top (personal digital assistant, PDA), a mobile handset, a tablet, a wireless terminal, an embedded device, or a device having a similar structure as in fig. 6. The embodiments of the present application are not limited to the type of communication device 400.

The communication method provided by the embodiment of the present application will be specifically described with reference to fig. 1 to 11.

It should be noted that, in the following embodiments of the present application, a name of a message between each network element or a name of each parameter in a message is only an example, and in specific implementations, other names may also be used, which is not limited in particular in the embodiments of the present application.

As shown in fig. 7, a flow chart of a communication method according to an embodiment of the present application is shown, and the method may include the following steps:

s101, an access network device sends a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set. Accordingly, the terminal receives the first message.

In this embodiment, the access network device sends a first message, where the first message includes frequency domain information of the control resource set and location information of a sub-resource set in the control resource set. The terminal receives the first message. For example, the first message may be SSB. The terminal may be the narrowband terminal or the wideband terminal. Wherein the access network device determines the location information of the sub-resource set in the control resource set before sending the first message, and then generates the first message. The set of control resources may be, for example, the set of control resources of the aforementioned broadband terminal. Thus, the terminal may determine a candidate physical downlink control channel for the terminal by receiving the first message.

The location information of the sub-resource set is used to instruct the terminal to detect the location of the candidate physical downlink control channel. And the terminal determines the frequency position of the candidate physical downlink control channel of the terminal in the control resource set. Specifically, the location information of the sub-resource set includes at least one of the following information: the frequency domain initial position information of the sub-resource set in the control resource set, and the frequency resource size information of the sub-resource set.

In one implementation, the frequency domain starting position information of the sub-resource set is an index of a starting CCE corresponding to the sub-resource set, and the frequency resource size information is an AL or a maximum AL corresponding to the candidate physical downlink control channel. By way of example, as shown in figure 8,each RB (R),When the number of symbols is equal, assuming that the frequency domain starting position information of the sub-resource set in coreset#0 is CCE with index 4 in coreset#0 and the frequency resource size information is al=2 corresponding to coreset#0, the sub-resource set occupies 5 REGs corresponding to cceindex=4, 6,1,3, and 5. As another example of this, and as another example,each RB (R),When each symbol is used, it is assumed that the sub-resources are collected inThe frequency domain starting position information in coreset#0 is CCE with index 4 in coreset#0, and the frequency resource size information is al=4 corresponding to coreset#0, and the sub-resource set occupies 6 REGs corresponding to cceindex= 4,6,1,3,5,7. It should be noted that, in this embodiment, the control resource set is described by taking coreset#0 as an example, and the present application is not limited to this control resource set, but may be CORESET configured by all common signaling or terminal-specific signaling. Therefore, the candidate physical downlink control channel of the terminal can be determined according to the index of the initial CCE corresponding to the sub-resource set and the AL or the maximum AL corresponding to the candidate physical downlink control channel.

For example, there may be multiple CCEs with the same index in CORESET # 0. As shown in fig. 8, there are 3 CCEs with index 4, and it may also be indicated which CCE with index 4 in CORESET #0 the starting CCE corresponding to the sub-resource set is. For example, the first CCE with index 4 is indicated as the starting CCE corresponding to the set of sub-resources. In a specific implementation, the first message or another message may indicate which CCE with index 4 is the starting CCE corresponding to the sub-resource set. Of course, the access network device and the terminal may also negotiate or pre-configure what CCE with index 4 is the starting CCE corresponding to the sub-resource set in advance. Therefore, through pre-negotiation, pre-configuration or indication, the specific CCE index of a plurality of identical CCE indexes can be accurately determined, so that the terminal can accurately determine the candidate physical downlink control channel of the terminal.

In addition, the terminal can detect candidate physical downlink control channels of multiple ats within the bandwidth capability range of the terminal. The frequency resource size information of the sub-resource set may be an AL corresponding to the candidate physical downlink control channel, and then the terminal starts from a starting CCE of the sub-resource set in coreset#0, and detects the physical downlink control channel on a frequency domain resource corresponding to the AL. For example, in fig. 8, if the starting cce=4 corresponding to the sub-resource set and al=4 corresponding to the candidate physical downlink control channel, the terminal detects 6 REGs corresponding to cceindex=4, 6, 1, 3, 5, and 7. The frequency resource size information of the sub-resource set may also be the maximum AL corresponding to the candidate physical downlink control channel, and then the terminal starts from the initial CCE of the sub-resource set in coreset#0 and detects the physical downlink control channel on the frequency domain resource corresponding to each AL less than or equal to the maximum AL. For example, in fig. 8, the initial cce=4 corresponding to the sub-resource set, the maximum al=4 corresponding to the candidate physical downlink control channel, and if AL less than or equal to the maximum al=4 includes two cases al=2 and al=4, the terminal detects the physical downlink control channel on the frequency domain resources corresponding to al=2 and al=4, respectively. Specifically, when al=2, the terminal detects 5 REGs corresponding to cceindex=4, 6, 1, 3, 5; at al=4, the terminal detects 6 REGs corresponding to cceindex=4, 6, 1, 3, 5, 7. Namely, when the frequency resource size information of the sub-resource set can also be the maximum AL corresponding to the candidate physical downlink control channel, the terminal starts from the initial CCE of the sub-resource set in coreset#0, and traverses the frequency domain resources corresponding to each AL smaller than or equal to the maximum AL to detect the physical downlink control channel accurately.

In another implementation, the frequency domain start position information of the sub-resource set is frequency domain start resource block position information of the sub-resource set, and the frequency resource size information of the sub-resource set is the number of resource blocks of the sub-resource set. Specifically, one frequency position offset with respect to a start resource block of coreset#0 or SSB in coreset#0 may be indicated as a frequency domain start resource block position of a sub-resource set of the terminal, or one RB index in coreset#0 may be indicated as a frequency domain start resource block position of a sub-resource set of the terminal, and one resource block number may be indicated as a frequency resource size of the sub-resource set of the terminal. As shown in the figure 9 of the drawings,each RB (R),The frequency domain start resource block position of the sub-resource set of the terminal can be indicated as the frequency start position relative to CORESET #0 or SSBThe frequency resource position of 6 RBs is shifted, and the number of resource blocks indicating the sub-resource set is 18 RBs, the frequency resource size of the sub-resource set of the terminal is 18 RBs. Alternatively, assuming scs=30 kHz, the frequency domain start resource block position of the sub-resource set of the terminal may be indicated as a frequency resource position offset by 0MHz with respect to the frequency start position of CORESET #0 or SSB, and the frequency resource size of the sub-resource set of the terminal is 5MHz. Therefore, the terminal can accurately determine the candidate physical downlink control channel of the terminal according to the frequency domain initial resource block position information of the sub-resource set and the number of the resource blocks of the sub-resource set.

It may be appreciated that, in the above implementation, the frequency domain start resource block location information about the sub-resource set of the terminal and the frequency resource size information about the sub-resource set may be implemented in combination, for example, in yet another implementation, the frequency domain start resource block location of the sub-resource set of the terminal is an index of a start control channel unit corresponding to the sub-resource set, and the frequency resource size information of the sub-resource set is the number of resource blocks of the sub-resource set. In yet another implementation, the frequency domain starting resource block position of the sub-resource set of the terminal is frequency domain starting resource block position information of the sub-resource set, and the frequency resource size information of the sub-resource set is an aggregation level or a maximum aggregation level corresponding to the candidate physical downlink control channel.

In yet another implementation, the set of control resources may include one or more frequency domain portions. The position information of the sub-resource set of the terminal is the position information of the frequency domain part where the sub-resource set is located. For example, CORESET #0 may be divided equally into 4 frequency domain portions, or may be divided unevenly into 4 frequency domain portions. The first message may include a frequency domain portion that the terminal needs to detect. Further, the first message may also indicate a total number of divided frequency domain parts, or the total number of frequency domain parts is divided according to a rule negotiated in advance. In this implementation, the physical downlink control channel may be accurately detected in the frequency domain portion that the terminal indicated by the first message needs to detect.

In one or more implementations described above, the first bit in the first message may be passed throughThe set is used to indicate the location information of the sub-resource set described above, and the first set of bits includes bits in the PBCH. For example, the bits in the PBCH may be included in the frequency range<At 6GHz, remain2 bits total; alternatively, the bits in the PBCH include 1 bit reserved in the MIB shown in table 1; alternatively, the bits in the PBCH includeThe number of bits and 1 bit reserved in the MIB; alternatively, the first set of bits is part of the bits in a newly defined PBCH that includes fields that may be different from the fields defined by the PBCH described above. Specifically, the first bit set may be further indicated as part of bits in the newly defined PBCH by the indication information of 1 bit, or the first bit set may beIndividual bits and/or reserved bits in MIB. For example, when the indication information is "1", the first bit set is indicated to be a part of bits in the newly defined PBCH, and the terminal receives the first message on the part of bits in the newly defined PBCH to obtain the location information of the indicated sub-resource set; when the indication information is "0", the first bit set is indicated as Bits and/or reserved bits in MIB, the terminal receives the first message and analyzesAnd/or reserved bits in the MIB, and acquiring the position information of the sub-resource set. The first oneBit set asThe bit terminals can receive and analyze the first bit set at the physical layer to obtain the position information of the sub-resource set; the first bit set is reserved bits in the MIB, and the terminal can analyze the first bit set in a radio resource control (radio resource control, RRC) layer or a physical layer to acquire the position information of the sub-resource set; or the first set of bits isThe terminal may parse the first bit set at the physical layer or the RRC layer to obtain location information of the sub-resource set. Therefore, the position information of the sub-resource set can be accurately indicated through reserved bits in the PBCH defined by the existing protocol or part of bits in the newly defined PBCH, and the utilization rate of resources is improved.

Specifically, the first bit set is used for indicating an entry in a preset table, where the preset table includes one or more entries, and each entry includes frequency domain starting position information and frequency resource size information of one sub-resource set.

In one implementation, the preset table may be as follows in tables 6 to 9:

by way of example, any one of the rows in table 6 below may be indicated by the first set of bits described above (assuming 1 bit).

TABLE 6

First bit set value	Frequency domain onset for a set of sub-resourcesInitial resource block location	Frequency resource size for a set of sub-resources
0	Cceindex=0 (second)	AL＝4,8
1	Cceindex=4 (first)	AL＝4

By way of example, any one of the rows in table 7 below may be indicated by the first set of bits described above (assuming 1 bit).

TABLE 7

For example, assuming CORESET #0 includes 2 frequency domain portions, any one of the following rows in table 8 may be indicated by the first set of bits described above (assuming 1 bit).

TABLE 8

For example, the above implementations may also be indicated in combination, with the first set of bits (assuming 2 bits) indicating any of the following rows in table 9:

TABLE 9

The above indications of the first set of bits are merely examples, and embodiments of the present application are not limited to the above examples.

It should be noted that, if the terminal detects a physical downlink control channel on a candidate physical downlink control channel of the sub-resource set and the physical downlink control channel is scheduled by DCI of system information (for example, SIB 1), the above tables 6 to 9 may be defined in a protocol; if the physical downlink control channel schedules DCI in other CORESET, the above tables 6 to 9 may be indicated in a system message, i.e. by common RRC signaling.

In another implementation, the preset table may also be the position information of the sub-resource set of the terminal added after each row based on the above table 2, that is, the preset table is an entry laterally extended based on the table for indicating the control resource set. An example is shown in table 10 below:

the position of the sub-resource set of the terminal may be indicated by a first set of 4 bits.

In addition, for each row in table 10 indicated by 4 bits of CORSET #0, a different table may be corresponding, for example, row 13 in table 10, row 14 in table 6 above, table 10, table 7 above, and so forth.

In addition, according to table 2, the number of resource blocks in the corset#0 and the number of symbols in the corset#0, and the frequency domain start resource block position of the sub-resource set in the corset#0 and the frequency resource size of the sub-resource set can be customized according to the action reserved field with index 15 in the existing protocol.

Table 10

In another example, the preset table may also be an entry that extends laterally and longitudinally based on a table used to indicate the set of control resources. Specifically, the first bit set may be further greater than 4 bits, for example, 5 bits, and then the indexes 15-31 may be used to customize the number of resource blocks in the more corset#0 and the number of symbols in the corset#0, as well as the frequency domain starting resource block position of the sub-resource set in the corset#0 and the frequency resource size of the sub-resource set. An example is shown in table 11 below.

S102, the access network equipment sends the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.

The access network device sends the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set configured for the terminal. The physical downlink control channel is used for carrying DCI scrambled by SI-RNTI.

S103, the terminal detects the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.

And the terminal detects the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set according to the position information of the sub-resource set included in the first message. If the DCI scrambled by the SI-RNTI is detected, descrambling the DCI and acquiring system information in a same time slot, thereby realizing the initial access of the terminal according to the system information.

When the frequency range of the candidate physical downlink control channel acquired by the terminal through the first message exceeds the bandwidth capacity of the terminal, for example, a terminal with the bandwidth capacity of 2MHz, and when judging that the bandwidth of the candidate physical downlink control channel indicated by the first message is 5MHz, the cell is considered to reject the access of the cell. At this point, the terminal does not need to attempt to access the cell in any other way.

TABLE 11

According to the communication method provided by the embodiment of the application, the access network equipment sends the first message, wherein the first message comprises the frequency domain information of the control resource set and the position information of the sub-resource set, and the physical downlink control channel is sent to the terminal on the candidate physical downlink control channel resource of the sub-resource set, and the terminal detects the physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set, so that the terminal can determine the frequency domain position of the candidate physical downlink control channel of the terminal in the broadband CORESET, and the reliability of detecting the physical downlink control channel is improved.

In further embodiments, the first message may also be system information, or terminal-specific (UE-specific) radio resource control (radio resource control, RRC) signaling. When the first message is system information or RRC signaling, the indication may not be limited to a table look-up indication. For example, the RRC signaling format is as follows:

the Start Frequency is used for indicating Frequency domain starting position information of the sub-resource set in the control resource set, and the Frequency range is used for indicating Frequency resource size information of the sub-resource set in the control resource set. In addition, a Potential aggregation level (Potential AL) may be included, where the Potential aggregation level may be used by the terminal, for example, the broadband terminal corresponds to an AL of 2,4,6,8,10, etc., and the Potential aggregation level of the terminal is 2,4.

It will be appreciated that in the various embodiments above, the methods and/or steps implemented by the terminal may also be implemented by a component (e.g., a chip or circuit) that may be used in the terminal; the methods and/or steps implemented by the access network device may also be implemented by a component (e.g., a chip or circuit) that may be used in the access network device.

The scheme provided by the embodiment of the application is mainly introduced from the interaction angle among the network elements. Correspondingly, the embodiment of the application also provides a communication device which is used for realizing the various methods. The communication device may be a terminal in the above method embodiment, or a device including the above terminal device, or a component usable for the terminal device; alternatively, the communication device may be an access network device in the above method embodiment, or an apparatus including the access network device, or a component usable with the access network device. It will be appreciated that the communication device, in order to achieve the above-described functions, comprises corresponding hardware structures and/or software modules performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional modules of the communication device according to the above method embodiment, for example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

Based on the same conception of the communication method, the application also provides the following communication device:

as shown in fig. 10, a schematic structural diagram of a communication device according to an embodiment of the present application is provided, where the communication device 600 includes a transceiver unit 61 and a processing unit 62; wherein:

the transceiver unit 61 is configured to receive a first message, where the first message includes frequency domain information for controlling a resource set and location information for a sub-resource set; and the processing unit 62 is configured to detect a physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.

Optionally, the frequency resource size information is an aggregation level corresponding to the candidate physical downlink control channel, and the processing unit 62 is configured to detect the physical downlink control channel on a frequency domain resource corresponding to the aggregation level, starting from a frequency domain starting position of the sub-resource set in the control resource set.

Optionally, the frequency resource size information is a maximum aggregation level corresponding to the candidate physical downlink control channel, and the processing unit 62 is configured to detect the physical downlink control channel on a frequency domain resource corresponding to each aggregation level less than or equal to the maximum aggregation level, from a frequency domain starting position of the sub-resource set in the control resource set.

Optionally, the frequency domain starting position information is frequency domain starting resource block position information of the sub-resource set, and the frequency resource size information is the number of resource blocks of the sub-resource set.

Optionally, the control resource set includes one or more frequency domain parts, and the location information of the sub-resource set is the location information of the frequency domain part where the sub-resource set is located.

Optionally, a first set of bits in the first message is used to indicate location information of the set of sub-resources, the first set of bits comprising bits in a physical broadcast channel.

Optionally, the first bit set is used to indicate an entry in a preset table, where the preset table includes one or more entries, and each entry includes frequency domain starting position information and frequency resource size information of one sub-resource set.

The specific implementation of the transceiver unit 61 and the processing unit 62 described above may refer to the relevant description of the terminal in the embodiment shown in fig. 7.

According to the communication device provided by the embodiment of the application, the device receives the first message sent by the access network equipment, wherein the first message comprises the frequency domain information of the control resource set and the position information of the sub-resource set, and the physical downlink control channel is detected on the candidate physical downlink control channel resource of the sub-resource set, so that the device can determine the frequency domain position of the candidate physical downlink control channel in the broadband CORESET, and the reliability of detecting the physical downlink control channel is improved.

Fig. 11 is a schematic structural diagram of another communication device according to an embodiment of the present application. The communication device 700 includes a processing unit 71 and a transceiver unit 72; wherein:

the processing unit 71 is configured to generate a first message, where the first message includes frequency domain information for controlling a resource set and location information for a sub-resource set;

the transceiver unit 72 is configured to send the first message; and

the transceiver unit 72 is further configured to send a physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.

The specific implementation of the processing unit 71 and the transceiver unit 72 described above may refer to the relevant description of the access network device in the embodiment shown in fig. 7.

According to the communication device provided by the embodiment of the application, the device sends the first message, wherein the first message comprises the frequency domain information of the control resource set and the position information of the sub-resource set, and the physical downlink control channel is sent to the terminal on the candidate physical downlink control channel resource of the sub-resource set, and the narrowband terminal detects the physical downlink control channel on the candidate physical downlink control channel resource of the sub-resource set, so that the narrowband terminal can determine the frequency domain position of the candidate physical downlink control channel of the narrowband terminal in the broadband CORESET, and the reliability of detecting the physical downlink control channel is improved.

Fig. 12 shows a simplified schematic structure of a terminal. For easy understanding and ease of illustration, in fig. 12, the terminal takes a mobile phone as an example. As shown in fig. 12, the terminal 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, executing software programs, processing data of the software programs and the like. The memory is mainly used for storing software programs and data. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. 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 mainly used for receiving data input by a user and outputting data to the user. It should be noted that some kinds of terminals may not have an input/output device.

When data need to be sent, the processor carries out baseband processing on the data to be sent and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit carries out radio frequency processing on the baseband signal and then sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor is shown in fig. 12. In an actual end 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 storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, as the embodiments of the application are not limited in this respect.

In the embodiment of the present application, the antenna and the radio frequency circuit with the transceiver function may be regarded as a receiving unit and a transmitting unit (which may also be collectively referred to as a transceiver unit) of the terminal, and the processor with the processing function may be regarded as a processing unit of the terminal. As shown in fig. 12, the terminal includes a transceiving unit 81 and a processing unit 82. The transceiver unit 81 may also be referred to as a receiver/transmitter (transmitter), a receiver/transmitter circuit, or the like. The processing unit 82 may also be referred to as a processor, processing board, processing module, processing device, etc. The transceiver unit 81 is used to implement the functions of the transceiver unit 61 in the embodiment shown in fig. 10.

For example, in one embodiment, the transceiver unit 81 is configured to perform the functions performed by the terminal in steps S101 and S102 in the embodiment shown in fig. 7; the processing unit 82 is configured to execute step S103 of the embodiment shown in fig. 7.

Fig. 13 shows a simplified schematic diagram of the structure of an access network device. The access network device comprises a radio frequency signal transceiving and converting part and a part 92, wherein the radio frequency signal transceiving and converting part comprises a transceiving unit 91 part. The radio frequency signal receiving and transmitting and converting part is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals and baseband signals; the 92 part is mainly used for baseband processing, control of access network equipment and the like. The transceiver unit 91 may also be referred to as a receiver/transmitter (transmitter), a receiver/transmitter circuit, or the like. Portion 92 is typically a control center of the access network device, which may be commonly referred to as a processing unit, for controlling the source access network device to perform the steps performed in relation to the access network device in fig. 7 described above. See for details the description of the relevant parts above. The transceiver unit 91 may be used to implement the functionality of the transceiver unit 71 in the embodiment shown in fig. 11.

Portion 92 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 access to the network device. If there are multiple boards, the boards can be interconnected to increase processing power. As an alternative implementation manner, the multiple boards may share one or more processors, or the multiple boards may share one or more memories, or the multiple boards may share one or more processors at the same time.

For example, in one embodiment, the transceiver unit 91 is configured to perform the functions performed by the access network device in steps S101 and S102 of the embodiment shown in fig. 7.

The embodiment of the present application also provides a computer readable storage medium having stored therein a computer program or instructions which, when executed, implement the method in the above embodiment.

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

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

It should be noted that one or more of the above units or units may be implemented in software, hardware or a combination of both. When any of the above units or units are implemented in software, the software exists in the form of computer program instructions and is stored in a memory, a processor may be used to execute the program instructions and implement the above method flows. The processor may be built in a system on chip (SoC) or ASIC, or may be a separate semiconductor chip. The processor may further include necessary hardware accelerators, such as field programmable gate arrays (field programmable gate array, FPGAs), programmable logic devices (programmable logic device, PLDs), or logic circuits implementing dedicated logic operations, in addition to the cores for executing software instructions for operation or processing.

When the above units or units are implemented in hardware, the hardware may be any one or any combination of a CPU, microprocessor, digital signal processing (digital signal processing, DSP) chip, micro control unit (microcontroller unit, MCU), artificial intelligence processor, ASIC, soC, FPGA, PLD, dedicated digital circuitry, hardware accelerator, or non-integrated discrete device, which may run the necessary software or be independent of the software to perform the above method flows.

Optionally, an embodiment of the present application further provides a chip system, including: at least one processor and an interface, the at least one processor being coupled with the memory through the interface, the at least one processor, when running a computer program or instructions in the memory, causes the chip system to perform the method of any of the method embodiments described above. Alternatively, the chip system may be formed by a chip, or may include a chip and other discrete devices, which are not specifically limited in this embodiment of the present application.

It should be understood that in the description of the present application, "/" means that the associated objects are in a "or" relationship, unless otherwise specified, for example, a/B may represent a or B; wherein A, B may be singular or plural. Also, in the description of the present application, unless otherwise indicated, "a plurality" means two or more than two. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural. In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ. Meanwhile, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion that may be readily understood.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it 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. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, etc. that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

A method of communication, the method comprising:

receiving a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set;

and detecting the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.
A method of communication, the method comprising:

transmitting a first message, wherein the first message comprises frequency domain information of a control resource set and position information of a sub-resource set;

and transmitting the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.
The method according to claim 1 or 2, wherein the location information of the set of sub-resources comprises at least one of the following information: and the frequency domain initial position information of the sub-resource set in the control resource set, and the frequency resource size information of the sub-resource set.
The method of claim 3, wherein the frequency domain starting location information is an index of a starting control channel unit corresponding to the set of sub-resources, and the frequency resource size information is an aggregation level or a maximum aggregation level corresponding to the candidate physical downlink control channel.
The method according to claim 3 or 4, wherein the frequency resource size information is an aggregation level corresponding to the candidate physical downlink control channel, and the detecting the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set includes: and starting from the frequency domain starting position of the sub-resource set in the control resource set, and detecting the physical downlink control channel on the frequency domain resource corresponding to the aggregation level.
The method according to claim 3 or 4, wherein the frequency resource size information is a maximum aggregation level corresponding to the candidate physical downlink control channel, and the detecting the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set includes: and starting from the frequency domain starting position of the sub-resource set in the control resource set, detecting the physical downlink control channel on the frequency domain resource corresponding to each aggregation level which is smaller than or equal to the maximum aggregation level.
The method according to any one of claims 1 to 6, wherein the frequency domain start position information is frequency domain start resource block position information of the sub-resource set, and the frequency resource size information is a number of resource blocks of the sub-resource set.
The method according to any one of claims 1 to 7, wherein the control resource set includes one or more frequency domain parts, and the location information of the sub-resource set is location information of the frequency domain part where the sub-resource set is located.
The method according to any of claims 1-8, wherein a first set of bits in the first message is used to indicate location information of the set of sub-resources, the first set of bits comprising bits in a physical broadcast channel.
The method of claim 9, wherein the first set of bits is used to indicate entries in a preset table, the preset table including one or more entries, each entry including frequency domain starting position information and frequency resource size information for one set of sub-resources.
A communication device, the device comprising:

a transceiver unit, configured to receive a first message, where the first message includes frequency domain information of a control resource set and location information of a sub-resource set;

and the processing unit is used for detecting the physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.
A communication device, the device comprising:

a processing unit, configured to generate a first message, where the first message includes frequency domain information for controlling a resource set and location information for a sub-resource set;

a transceiver unit, configured to send the first message;

the transceiver unit is further configured to send a physical downlink control channel on the candidate physical downlink control channel resources of the sub-resource set.
The apparatus according to claim 11 or 12, wherein the location information of the set of sub-resources comprises at least one of: and the frequency domain initial position information of the sub-resource set in the control resource set, and the frequency resource size information of the sub-resource set.
The apparatus of claim 13, wherein the frequency domain starting location information is an index of a starting control channel unit corresponding to the set of sub-resources, and the frequency resource size information is an aggregation level or a maximum aggregation level corresponding to the candidate physical downlink control channel.
The apparatus according to claim 13 or 14, wherein the frequency resource size information is an aggregation level corresponding to the candidate physical downlink control channel, and the processing unit is configured to detect the physical downlink control channel on a frequency domain resource corresponding to the aggregation level, starting from a frequency domain starting position of the sub-resource set in the control resource set.
The apparatus according to claim 13 or 14, wherein the frequency resource size information is a maximum aggregation level corresponding to the candidate physical downlink control channel, and the processing unit is configured to detect the physical downlink control channel on a frequency domain resource corresponding to each aggregation level less than or equal to the maximum aggregation level, respectively, starting from a frequency domain starting position of the sub-resource set in the control resource set.
The apparatus according to any one of claims 11-16, wherein the frequency domain start position information is frequency domain start resource block position information of the sub-resource set, and the frequency resource size information is a number of resource blocks of the sub-resource set.
The apparatus according to any one of claims 11 to 17, wherein the set of control resources includes one or more frequency domain parts, and the location information of the set of sub-resources is the location information of the frequency domain part in which the set of sub-resources is located.
The apparatus according to any of claims 11-18, wherein a first set of bits in the first message is used to indicate location information of the set of sub-resources, the first set of bits comprising bits in a physical broadcast channel.
The apparatus of claim 19, wherein the first set of bits is used to indicate entries in a preset table, the preset table comprising one or more entries, each entry comprising frequency domain starting location information and frequency resource size information for one set of sub-resources.
A communications device comprising a processor, a memory, and instructions stored on the memory and executable on the processor, which when executed, cause the communications device to perform the method of any one of claims 1, 3 to 10.
A communications device comprising a processor, a memory, and instructions stored on the memory and executable on the processor, which when executed, cause the communications device to perform the method of any one of claims 2, 3 to 10.
A communication device, comprising: a processor for performing the method of any one of claims 1, 3-10.
A communication device, comprising: a processor for performing the method of any one of claims 2, 3-10.
A communication system comprising a communication device according to any one of claims 11 to 20.
A computer readable storage medium comprising instructions which, when run on a computer, perform the method of any one of claims 1 to 10.
A computer program product which, when run on a computer, causes the method of any one of claims 1 to 10 to be performed.