CN106961734B - Information transmission method and device - Google Patents

Abstract

The invention provides a method and a device for transmitting information, wherein the method comprises the following steps: the network device determines frequency offset information or frequency domain location information, determines a narrowband for transmitting information according to the frequency offset information or the frequency domain location information, and transmits information on the narrowband. By the technical scheme, the problem of how to determine the narrow band of the transmission channel on the bandwidth of the LTE system is solved, and the narrow band of the transmission channel is determined.

Description

Information transmission method and device

technical field

The present invention relates to the communication field, in particular, to an information transmission method and device.

Background technique

Machine Type Communication (MTC for short) User Equipment (UE for short), also known as Machine to Machine (M2M for short) user communication equipment, is currently the main application form of the Internet of Things. In the 3rd Generation Partnership Project (3rd Generation Partnership Project, referred to as 3GPP) technical report TR45.820V200, several technologies applicable to the cellular Internet of Things (Comb-Internet Of Things, referred to as C-IOT) are disclosed, wherein, Narrow Band-Internet of Things (NB-IoT for short) technology is the most eye-catching. The system bandwidth of the system is 200kHz, which is the same as the channel bandwidth of the Global system for Mobile Communication (GSM) GSM system. Great convenience. NB-IoT has three working scenarios, which are independently operating "standalone", transmitting "guard band" on the guard band, and transmitting "inband" on a PRB in LTE.

In the related art, there is currently no effective solution for how to determine the narrowband of the transmission channel in the LTE system bandwidth.

Contents of the invention

The present invention provides an information transmission method and device to at least solve the problem of how to determine the narrowband of the transmission channel in the LTE system bandwidth in the related art.

According to one aspect of the present invention, a method for transmitting information is provided, including:

The network device determines frequency offset information or frequency domain location information;

A narrowband for transmitting information is determined according to the frequency offset information or frequency domain location information, and information is transmitted on the narrowband.

Further, the frequency offset information determined by the network device includes one of the following:

determining the frequency domain offset information according to predefined information;

The frequency offset information is determined by receiving the notification information of the network device.

Further, the frequency offset information includes one of the following:

The frequency offset information carried in the main system information block MIB, wherein the frequency offset information indicates the frequency offset between the first narrowband and the second narrowband, and the first narrowband is a narrowband that transmits at least one of the following: System information block SIB, RAR, paging message, downlink control channel and PDSCH, the second narrowband is a narrowband for transmitting at least one of the following: primary synchronization signal PSS, secondary synchronization signal SSS and physical broadcast channel PBCH;

The frequency offset information carried in the SIB, where the frequency offset information indicates the frequency offset between the third narrowband and the fourth narrowband, where the third narrowband is a narrowband that transmits at least one of the following: random access Incoming response RAR, paging message, downlink control channel and physical downlink shared channel PDSCH, the fourth narrowband is a narrowband for transmitting at least one of the following: PSS, SSS, PBCH and SIB;

The frequency offset information carried in SIBx, wherein the frequency offset information indicates the frequency offset between the fifth narrowband and the sixth narrowband, where the fifth narrowband is a narrowband that transmits at least one of the following: RAR, Paging messages, downlink control channels and PDSCH, and SIBs other than SIBx, the sixth narrowband is a narrowband that transmits at least one of the following: PSS, SSS, PBCH, and SIBx, wherein the SIBx is a specified SIB information;

The frequency offset information carried in the primary synchronization signal PSS and the secondary synchronization signal SSS, wherein the frequency offset information indicates the frequency offset between the seventh narrowband and the eighth narrowband, wherein the seventh narrowband is the At least one of the narrowbands: PBCH, SIB, RAR, paging message, downlink control channel and PDSCH, and the eighth narrowband is the narrowband for transmitting at least one of the following: PSS and SSS.

Further, the first narrowband, the third narrowband, the fifth narrowband and the seventh narrowband are a PRB in a long term evolution LTE system.

Further, the center frequencies of the center subcarriers of the second narrowband, the fourth narrowband, the sixth narrowband and the eighth narrowband satisfy an integer multiple of 100KHz.

Further, the frequency offset information indicates the number of offset subcarriers.

Further, the absolute value of the frequency offset X indicated by the frequency offset information is less than or equal to Y subcarriers, X is an integer, and Y is a preset positive integer.

Further, X is an integer between -5 and 6, or an integer between -6 and 5, or an integer between 0 and 11.

Further, the frequency offset information includes:

The frequency offset information carried in the MIB or SIB is the offset between the specified narrowband and the preset frequency, and the specified narrowband is a narrowband that transmits at least one of the following: PSS, SSS, PBCH, SIB, RAR, homing call message, downlink control channel and PDSCH.

Further, the preset frequency is an integer multiple of 100KHz.

Further, the specified narrowband is a PRB in the LTE system.

Further, the frequency offset indicated by the frequency offset information is an integer multiple or an odd multiple of 2.5 KHz; the frequency offset information is a frequency offset corresponding to an index in the predefined set.

Further, when the narrowband is an uplink narrowband, the frequency offset information is one of the following:

The frequency offset between the uplink narrowband and the center frequency point of the uplink system bandwidth;

The frequency offset between the uplink narrowband and an integer multiple of 100KHz;

A frequency offset between the uplink narrowband and a designated frequency point, the designated frequency point is determined by the default UE sending-receiving frequency interval;

Further, when the narrowband is an uplink narrowband, the frequency domain position information is a PRB index corresponding to the uplink narrowband.

Further, the predefined information or notification information includes at least one of the following:

system bandwidth;

PRB information corresponding to the uplink narrowband;

PRB information corresponding to the downlink narrowband;

Offset of DC subcarrier between downlink narrowband and system bandwidth;

The difference between the PRB index corresponding to the uplink narrowband and the PRB index corresponding to the downlink narrowband;

The difference between the first value and the second value, the first value is the frequency offset value between the uplink narrowband and the center frequency point of the uplink system bandwidth, and the second value is the downlink narrowband and the downlink The frequency offset value between the center frequency points of the system bandwidth.

Further, when the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is:

F _UL =F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.015n _UL ;

or,

F _UL =F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.09n _UL ;

Among them, F _UL is the center frequency point of the uplink narrowband, F _{UL_LOW} is the lowest frequency of the working frequency band where the uplink narrowband is located, N _UL is the uplink carrier frequency corresponding to the system bandwidth, N _Offs-UL is the working frequency of the uplink narrowband The offset value corresponding to the frequency band, n _UL is the frequency offset value, n _UL is an integer, and the unit of F _UL , F _{UL_LOW} , N _UL and N _Offs-UL is MHz.

Further, when the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.01n _UL

Wherein, F _UL is the center frequency point of the uplink narrowband, F _{UL_LOW} is the lowest frequency of the working frequency band where the uplink narrowband is located, N _UL is the uplink carrier frequency corresponding to the uplink narrowband, and N _Offs-UL is the frequency corresponding to the uplink narrowband. The offset value corresponding to the working frequency band, n _UL is the frequency offset value, n _UL is an integer, and the unit of F _UL , F _{UL_LOW} , N _UL and N _Offs-UL is MHz.

Further, n _UL ∈ {-4,-3,-2,-1,0,1,2,3,4,5},

Or, n _UL ∈ {-5,-4,-3,-2,-1,0,1,2,3,4}

Alternatively, n _UL ∈ {0,1,2,3,4,5,6,7,8,9}.

Further, when the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is:

F _UL =F _DL -Δf+0.015n _UL ;

or,

F _UL =F _DL -Δf+0.09n _UL ;

Among them, F _UL is the center frequency point of the uplink narrowband, F _DL is the center frequency point of the downlink narrowband or the frequency of the center subcarrier, Δf is the default UE transmission-reception frequency interval, and the unit of F _UL and F _DL is MHz, n _UL is the frequency offset value, and n _UL is an integer.

Further, the center frequency point of the uplink narrowband is:

F _UL =F _DL '-Δf+0.09n _UL ;

Among them, F _UL is the center frequency point of the uplink narrowband, F _DL ′ is the center frequency point of the downlink system bandwidth, Δf is the default UE sending-receiving frequency interval, the unit of F _UL and F _DL ′ is MHz, and n _UL is Frequency offset value, n _UL is an integer.

Further, the center frequency point of the uplink narrowband is:

F _UL =F _DL -Δf+0.015n _UL +x·0.0075;

or,

F _UL =F _DL -Δf+0.09n _UL +x·0.0075;

Among them, F _UL is the center frequency point of the uplink narrowband, F _DL is the center frequency point of the downlink narrowband or the frequency of the center subcarrier, Δf is the default UE transmission-reception frequency interval, and the unit of F _UL and F _DL is MHz, n _UL is a frequency offset value, n _UL is an integer, x is 1 or -1, and x is predefined or indicated by high-layer signaling.

Further, when the narrowband is a downlink narrowband, the center frequency point of the downlink narrowband is:

F _DL =F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.3n _DL ;

or,

F _DL =F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.2n _DL ;

Wherein, F _DL is the center frequency point of the downlink narrowband or the frequency of the center subcarrier, F _{DL_LOW} is the lowest frequency of the working frequency band where the downlink narrowband is located, N _DL is the downlink carrier frequency corresponding to the system bandwidth, N _Offs-DL is an offset value corresponding to the working frequency band where the downlink narrowband is located, n _DL is a frequency offset value, n _DL is an integer, and the units of F _DL , F _{DL_LOW} , N _DL and N _Offs-DL are all in MHz.

According to another aspect of the present invention, there is also provided an information transmission device located in a network device, including:

A determining module, configured for the network device to determine frequency offset information or frequency domain location information;

A transmission module, configured to determine a narrowband for transmitting information according to the frequency offset information or frequency domain position information, and transmit information on the narrowband.

Further, the determination module includes one of the following:

a custom unit, configured to determine the frequency domain offset information according to predefined information;

The receiving unit is configured to receive notification information from a network device and determine the frequency offset information.

Through the present invention, the network device determines frequency offset information or frequency domain location information, determines the narrowband for transmitting information according to the frequency offset information or frequency domain location information, and transmits information on the narrowband, which solves the problem of how to transmit information on the LTE system bandwidth. The problem of determining the narrowband of the transmission channel determines the narrowband of the transmission channel.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flowchart of a method for transmitting information according to an embodiment of the present invention;

FIG. 2 is a structural block diagram 1 of an information transmission device according to an embodiment of the present invention;

FIG. 3 is a second structural block diagram of an information transmission device according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of frequency offset information in a system bandwidth according to a preferred embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

In this embodiment, a method for transmitting information is provided. FIG. 1 is a flowchart of a method for transmitting information according to an embodiment of the present invention. As shown in FIG. 1 , the process includes the following steps:

Step S102, the network device determines frequency offset information or frequency domain location information;

Step S104: Determine a narrowband for transmitting information according to the frequency offset information or frequency domain position information, and transmit information on the narrowband.

Through the above steps, the network device determines the frequency offset information or frequency domain location information, determines the narrowband for transmitting information according to the frequency offset information or frequency domain location information, and transmits information on the narrowband, which solves the problem of how to transmit information on the LTE system bandwidth. The problem of determining the narrowband of the transmission channel determines the narrowband of the transmission channel.

In an embodiment of the present invention, the network device determines that the frequency offset information includes one of the following:

determining the frequency domain offset information according to predefined information;

The frequency offset information is determined by receiving the notification information of the network device.

In an embodiment of the present invention, the frequency offset information includes one of the following:

The frequency offset information carried in the main system information block MIB, wherein the frequency offset information indicates the frequency offset between the first narrowband and the second narrowband, and the first narrowband is a narrowband that transmits at least one of the following: system information block SIB, RAR, paging message, downlink control channel and PDSCH, the second narrowband is a narrowband for transmitting at least one of the following: primary synchronization signal PSS, secondary synchronization signal SSS and physical broadcast channel PBCH;

The frequency offset information carried in the SIB, where the frequency offset information indicates the frequency offset between the third narrowband and the fourth narrowband, where the third narrowband is a narrowband that transmits at least one of the following: random access response RAR , a paging message, a downlink control channel and a physical downlink shared channel PDSCH, the fourth narrowband is a narrowband for transmitting at least one of the following: PSS, SSS, PBCH and SIB;

The frequency offset information carried in SIBx, where the frequency offset information indicates the frequency offset between the fifth narrowband and the sixth narrowband, where the fifth narrowband is a narrowband that transmits at least one of the following: RAR, paging message , a downlink control channel and PDSCH, and SIBs other than SIBx, the sixth narrowband is a narrowband that transmits at least one of the following: PSS, SSS, PBCH, and SIBx, where the SIBx is a specified SIB message;

The frequency offset information carried in the primary synchronization signal PSS and the secondary synchronization signal SSS, where the frequency offset information indicates the frequency offset between the seventh narrowband and the eighth narrowband, where the seventh narrowband is at least one of the following: narrowbands: PBCH, SIB, RAR, paging message, downlink control channel and PDSCH, the eighth narrowband is the narrowband for transmitting at least one of the following: PSS and SSS.

In the embodiment of the present invention, the first narrowband, the third narrowband, the fifth narrowband and the seventh narrowband are a PRB in the Long Term Evolution LTE system.

In an embodiment of the present invention, the center frequencies of the center subcarriers of the second narrowband, the fourth narrowband, the sixth narrowband and the eighth narrowband satisfy an integer multiple of 100 KHz.

In an embodiment of the present invention, the frequency offset information indicates the number of offset subcarriers.

In an embodiment of the present invention, the absolute value of the frequency offset X indicated by the frequency offset information is less than or equal to Y subcarriers, X is an integer, and Y is a preset positive integer.

In an embodiment of the present invention, X is an integer between -5 and 6, or an integer between -6 and 5, or an integer between 0 and 11.

In an embodiment of the present invention, the frequency offset information includes:

The frequency offset information carried in the MIB or SIB is an offset between a specified narrowband and a preset frequency, and the specified narrowband is a narrowband that transmits at least one of the following: PSS, SSS, PBCH, SIB, RAR, paging message , downlink control channel and PDSCH.

In an embodiment of the present invention, the preset frequency is an integer multiple of 100KHz.

In the embodiment of the present invention, the designated narrowband is a PRB in the LTE system.

In an embodiment of the present invention, the frequency offset indicated by the frequency offset information is an integer multiple or an odd multiple of 2.5 KHz; the frequency offset information is a frequency offset corresponding to an index in the predefined set.

In an embodiment of the present invention, when the narrowband is an uplink narrowband, the frequency offset information is one of the following:

The frequency offset between the uplink narrowband and the center frequency point of the uplink system bandwidth;

The frequency offset between the uplink narrowband and integer multiples of 100KHz;

The frequency offset between the uplink narrowband and a designated frequency point, the designated frequency point is determined by the default UE sending-receiving frequency interval;

In the embodiment of the present invention, when the narrowband is an uplink narrowband, the frequency domain location information is a PRB index corresponding to the uplink narrowband.

In an embodiment of the present invention, the predefined information or notification information includes at least one of the following:

system bandwidth;

PRB information corresponding to the uplink narrowband;

PRB information corresponding to the downlink narrowband;

Offset of DC subcarrier between downlink narrowband and system bandwidth;

The difference between the PRB index corresponding to the uplink narrowband and the PRB index corresponding to the downlink narrowband;

The difference between the first value and the second value, the first value is the frequency offset value between the center frequency point of the uplink narrowband and the uplink system bandwidth, and the second value is the difference between the downlink narrowband and the downlink system bandwidth The frequency offset value between the center frequency points.

Further, when the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is:

F _UL =F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.015n _UL ;

or,

F _UL =F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.09n _UL ;

Among them, F _UL is the center frequency point of the uplink narrowband, F _{UL_LOW} is the lowest frequency of the working frequency band where the uplink narrowband is located, N _UL is the uplink carrier frequency corresponding to the system bandwidth, N _Offs-UL is the corresponding working frequency band where the uplink narrowband is located n _UL is a frequency offset value, n _UL is an integer, and the unit of F _UL , F _{UL_LOW} , N _UL and N _Offs-UL is MHz.

In an embodiment of the present invention, when the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.01n _UL

Among them, F _UL is the center frequency point of the uplink narrowband, F _{UL_LOW} is the lowest frequency of the working frequency band where the uplink narrowband is located, N _UL is the uplink carrier frequency corresponding to the uplink narrowband, N _Offs-UL is the working frequency band where the uplink narrowband is located For the corresponding offset value, n _UL is a frequency offset value, n _UL is an integer, and the unit of F _UL , F _{UL_LOW} , N _UL and N _Offs-UL is MHz.

In an embodiment of the present invention, n _UL ∈{-4,-3,-2,-1,0,1,2,3,4,5},

Or, n _UL ∈ {-5,-4,-3,-2,-1,0,1,2,3,4};

Alternatively, n _UL ∈ {0,1,2,3,4,5,6,7,8,9}.

In an embodiment of the present invention, when the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is:

F _UL =F _DL -Δf+0.015n _UL ;

or,

F _UL =F _DL -Δf+0.09n _UL ;

Among them, F _UL is the center frequency point of the uplink narrowband, F _DL is the center frequency point of the downlink narrowband or the frequency of the center subcarrier, Δf is the default UE sending-receiving frequency interval, and the unit of F _UL and F _DL is MHz , n _UL is a frequency offset value, and n _UL is an integer.

In the embodiment of the present invention, the center frequency point of the uplink narrowband is:

F _UL =F _DL '-Δf+0.09n _UL ;

Among them, F _UL is the center frequency point of the uplink narrowband, F _DL ′ is the center frequency point of the downlink system bandwidth, Δf is the default UE sending-receiving frequency interval, the unit of F _UL and F _DL ′ is MHz, and n _UL is Frequency offset value, n _UL is an integer.

In the embodiment of the present invention, the center frequency point of the uplink narrowband is:

F _UL =F _DL -Δf+0.015n _UL +x·0.0075;

or,

F _UL =F _DL -Δf+0.09n _UL +x·0.0075;

Among them, F _UL is the center frequency point of the uplink narrowband, F _DL is the center frequency point of the downlink narrowband or the frequency of the center subcarrier, Δf is the default UE sending-receiving frequency interval, and the unit of F _UL and F _DL is MHz , n _UL is a frequency offset value, n _UL is an integer, x is 1 or -1, and x is predefined or indicated by high-layer signaling.

In an embodiment of the present invention, when the narrowband is a downlink narrowband, the center frequency point of the downlink narrowband of the narrowband is:

F _DL =F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.3n _DL ;

or,

F _DL =F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.2n _DL ;

Among them, F _DL is the center frequency point of the downlink narrowband or the frequency of the center subcarrier, F _{DL_LOW} is the lowest frequency of the working frequency band where the downlink narrowband is located, N _DL is the downlink carrier frequency corresponding to the system bandwidth, and N _Offs-DL is the frequency corresponding to the system bandwidth. The offset value corresponding to the working frequency band where the downlink narrowband is located, n _DL is a frequency offset value, n _DL is an integer, and the unit of F _DL , F _{DL_LOW} , N _DL and N _Offs-DL is MHz.

In this embodiment, an information transmission device is also provided, which is used to implement the above embodiments and preferred implementation modes, and what has already been described will not be repeated. As used below, the term "module" may be a combination of software and/or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

Fig. 2 is a structural block diagram 1 of an information transmission device according to an embodiment of the present invention. As shown in Fig. 2, the device is located in a network device, and the device includes:

A determining module 22, configured for the network device to determine frequency offset information or frequency domain location information;

The transmission module 24 is configured to determine a narrowband for transmitting information according to the frequency offset information or frequency domain location information, and transmit information on the narrowband.

Through the above-mentioned means, the determination module 22 is used for network equipment to determine frequency offset information or frequency domain location information, and the transmission module 24 is used to determine a narrowband for transmitting information according to the frequency offset information or frequency domain location information, and transmit information on the narrowband , solves the problem of how to determine the narrowband of the transmission channel in the LTE system bandwidth, and determines the narrowband of the transmission channel.

FIG. 3 is a structural block diagram 2 of an information transmission device according to an embodiment of the present invention. As shown in FIG. 3 , the determining module 24 includes one of the following:

A self-defining unit 32, configured to determine the frequency domain offset information according to predefined information;

The receiving unit 34 is configured to receive the notification information of the network device and determine the frequency offset information.

The present invention will be described in detail below in conjunction with preferred embodiments and implementation modes.

Preferred embodiment one:

This preferred embodiment provides a method for determining frequency offset and transmitting channel/information. This preferred embodiment is described by taking the NB-IoT system as an example. In practical applications, it is not limited to the application in the NB-IoT system, and can also be used in other systems.

In the related art, the UE needs to perform frequency sweep (channel raster) at integer multiples of 100 KHz to receive the synchronization channel. In the LTE system, the subcarrier width is 15KHz, so the frequency of the DC subcarrier in the LTE system is a common multiple of 15KHz and 100KHz, that is, 300KHz.

In the NB-IoT system, the frequency of the central subcarrier of the synchronization channel PSS/SSS is an integer multiple of 300KHz. For example, when the system bandwidth is 20MHz, the central subcarrier of PSS/SSS is PRB#8 and subcarrier #4 satisfies an integral multiple of 300KHz, where the PRB index is the PRB index in the prior art, that is, all the subcarriers in the system bandwidth The index of the PRB numbered from the lowest frequency to the highest from zero, and the subcarrier index on the PRB is the index after the subcarriers on the PRB are numbered from the lowest frequency to the highest from zero. The other subcarriers occupied by the synchronization channel may be 6 subcarriers on both sides of the central subcarrier, or 6 subcarriers on one side and 5 subcarriers on the other side, which is not limited in the present invention. Any one can be used in practical applications. The eNB can arbitrarily choose a transmission method, and the UE performs blind detection according to the above-mentioned several methods. Preferably, the subcarrier occupancy mode is preset, for example, it is fixed that there are 5 subcarriers with a frequency lower than the central subcarrier frequency, and 6 subcarriers with a frequency higher than the central subcarrier frequency. PBCH is also sent on the same narrowband as the sync channel.

Downlink information/channels other than the synchronization channel and PBCH, such as SIB, downlink control channel, PDSCH, etc., are sent on a narrowband offset from the PSS/SSS. Alternatively, at least one of other information/channels other than synchronization channel and PBCH is sent on a narrowband offset from said PSS/SSS.

The advantage of this is that only the synchronization channel and the PBCH channel are not aligned with the existing PRB, while other channels are aligned with the existing PRB. Compared with the mode in which all channels are sent on the narrowband corresponding to the PSS/SSS, the mode provided by the present invention has the least impact on the legacy UE.

4 is a schematic diagram of frequency offset information in the system bandwidth according to a preferred embodiment of the present invention. As shown in FIG. carrier. Among them, the central subcarrier of PSS/SSS is subcarrier #4 of PRB#8, and the occupied narrowband is shown in the gray part. The left side of the central subcarrier occupies 5 subcarriers, and the right side occupies 6 subcarriers. The narrowband occupied by other channels is as follows: As indicated by the slash, PRB#8 is occupied. The eNB can indicate in the PBCH that other channels are shifted by 1 subcarrier to the higher frequency side relative to the narrowband of the PSS/SSS channel.

In this way, after the UE receives the PSS/SSS and PBCH, the UE will shift one subcarrier to the higher frequency side to receive other channels. After the UE accesses the system, if it needs to receive PSS/SSS/PBCH again, it needs to frequency hop to the narrowband where PSS/SSS/PBCH is located to receive.

The offset information may be preset, for example, it is preset to offset one subcarrier in the direction of high frequency. Preferably, this method is used in the scenario where PSS/SSS is sent at a preset location, for example, when the NB-IoT system is only used for 10MHz and 20MHz system bandwidth, the center frequency of PSS/SSS is in some PRBs sent on subcarrier #4.

Alternatively, the offset information may be notified by the eNB. The eNB notifies the offset in the MIB, and the unit of the offset is a subcarrier. The offset information can be a positive integer between 0 and 11, or an integer between -6 and 5, or an integer between -5 and 6, which can be indicated by 4 bits, or The indication can be encoded in conjunction with other information.

Optionally, the location where the PSS/SSS/PBCH of the NB-IoT system is sent may be limited to reduce signaling overhead. For example, for an even-numbered system bandwidth, the transmission is limited to subcarriers #4 and #7 of certain PRBs, and the offset corresponding to subcarrier #4 is +1, that is, one subcarrier is offset to the side with a higher frequency, and the subcarrier The offset corresponding to #7 is -2, that is, offset 2 subcarriers to the side with low frequency; for odd system bandwidth, it is limited to send on subcarriers #5 and #6 of some PRBs, and subcarrier #5 corresponds to The offset is 0, and the offset corresponding to subcarrier #6 is -1. Then 2 bits can be used in the PBCH to indicate 4 kinds of offsets, and the UE determines to receive the narrowband of other channels according to the indication.

Optionally, when PSS/SSS/PBCH occupies part of the subcarriers of a PRB, and the PRB is allocated to a UE, the data of the UE on the part of the subcarriers is deleted, and the eNB can use a lower The code rate is used to transmit to the UE to increase the correct rate of transmission.

Optionally, when receiving the synchronization signal, the UE may align the center frequency of the receiving narrowband of the receiver with the center subcarrier. For example, in FIG. 4 , the UE aligns the center frequency of the receiving narrowband of the receiver with subcarrier #4. Alternatively, the center frequency of the receiving narrowband of the receiver may have a frequency domain position with a certain offset from the central subcarrier. For example, in FIG. 4, the UE aligns the center frequency of the receiving narrowband of the receiver with subcarrier 4 and subcarrier 5 The center position of , that is, relative to the center subcarrier, is shifted by half a subcarrier in the direction of high frequency, that is, 7.5KHz.

Optionally, the eNB notifies the offset of the downlink narrowband and the DC subcarrier of the system bandwidth in the PBCH or MIB, for example, +60, that is, the center subcarrier of the downlink narrowband is on the higher frequency side of the DC subcarrier of the system bandwidth On the 60th subcarrier, through the information, the UE can obtain the sequence value of the CRS on the downlink narrowband, and the CRS can be used for demodulation of the information on the downlink narrowband.

Preferred embodiment two:

This preferred embodiment provides a method for determining frequency offset and transmitting channel/information. This preferred embodiment is described by taking the NB-IoT system as an example. In practical applications, it is not limited to the application in the NB-IoT system, and can also be used in other systems.

Similar to preferred embodiment 1, the difference is:

PSS/SSS, PBCH, and SIB1 are all sent on the same narrowband, and the eNB notifies the downlink in SIB1 of other channels/information except PSS/SSS, PBCH, and SIB, or at least one of other channels/information The transmission narrowband and PSS/SSS , the offset between the transmission narrowbands of PBCH and SIB1. The UE receives the frequency offset information in SIB1, and receives the downlink signal on the corresponding narrowband. Or the offset is preset, and the UE receives downlink signals on a corresponding narrowband according to the frequency offset.

Or, PSS/SSS, PBCH, and SIB are all sent on the same narrowband, and the eNB notifies the transmission narrowband and PSS of at least one of other downlink channels/information or other channels/information except PSS/SSS, PBCH, and SIB in the SIB The offset between the transmission narrowbands of /SSS, PBCH and SIB, for example, the offset information is notified in SIB1 or other SIB messages, and the UE receives the frequency offset information and receives downlink signals on the corresponding narrowband. Or the offset is preset, and the UE receives downlink signals on a corresponding narrowband according to the frequency offset.

Or, PSS/SSS, PBCH and part of SIB are all sent on the same narrowband, and eNB notifies downlink transmission narrowband of at least one of other channels/information or other channels/information except PSS/SSS, PBCH and part of SIB in SIB The offset between the transmission narrowbands of PSS/SSS, PBCH and some SIBs. For example, the eNB notifies the offset information in SIB2, the UE receives the frequency offset information, and receives SIB3 and all subsequent ones on the corresponding narrowband SIB and other downlink channels/information or other channels/information. Or the offset is preset, and the UE receives downlink signals on a corresponding narrowband according to the frequency offset.

Preferred embodiment three:

This preferred embodiment provides a method for determining frequency offset and transmitting channel/information. This preferred embodiment is described by taking the NB-IoT system as an example. In practical applications, it is not limited to the application in the NB-IoT system, and can also be used in other systems.

The downlink narrowband of NB-IoT is a complete PRB of the LTE system, and all downlink channels or at least one of the downlink channels are sent on the PRB. However, in the LTE system, the center frequency points of all PRBs are not integer multiples of 100KHz, and the UE will perform frequency scanning according to the integer multiples of 100KHz, so that there will be a certain frequency offset when the UE receives. For example, for a system bandwidth of 10MHz, when PSS/SSS is sent on PRB#4, there will be a frequency offset of 2.5KHz from an integer multiple of 100KHz.

In this preferred embodiment, eNB notifies the frequency offset in PBCH/SIB. Optionally, the frequency offset is an integer multiple of 2.5 KHz. The frequency offset can take values in a set, such as {+7.5KHz, -7.5KHz, +2.5KHz, -2.5KHz}, and the eNB uses 2 bits to indicate the frequency offset information in the PBCH/SIB. Then, after receiving the PBCH/SIB, the UE can obtain the frequency offset value, and then adjust the center frequency to the center of a PRB to receive downlink signals. By adopting such a method, the UE is prevented from being affected by the frequency offset when receiving the subsequent channel, and the receiving performance of the UE is improved.

Optionally, the frequency offset is a frequency offset corresponding to an index in a predefined set. For example, the set is a set of several PRBs, each PRB is represented by an index, and each PRB corresponds to a frequency offset value. For example, for a 5MHz system bandwidth, there are a total of 4 PRBs that can be used as the narrowband of the NB-IoT system. They are PRB#2, 7, 17, and 22 respectively. Use 2 bits to indicate these 4 PRBs. The offsets corresponding to PRB#2 and 7 are +7.5KHz, and the offsets corresponding to PRB#2 and 7 are -7.5KHz. Then the UE The PRB index can be obtained according to the 2-bit information notified by the eNB, and then the offset information can be obtained.

Preferred embodiment four:

This preferred embodiment provides a method for determining frequency offset and transmitting channel/information. This preferred embodiment is described by taking the NB-IoT system as an example. In practical applications, it is not limited to the application in the NB-IoT system, and can also be used in other systems.

The offset between the PBCH and PSS/SSS narrowbands is preset. For example, the PSS/SSS narrowband is shifted by 2 PRBs to the lower frequency side relative to the PBCH narrowband. Or it may be a subcarrier-level offset, for example, the narrowband of the PSS/SSS is offset by 20 subcarriers to the higher frequency side than the narrowband of the PBCH.

Preferably, the position where the PSS/SSS transmits the narrowband is preset. For example, for all system bandwidths, the central subcarrier of the PSS/SSS narrowband is located on the high frequency side of the DC subcarrier of the system bandwidth (or, it can also be the frequency The 60th subcarrier on the lower side), this subcarrier satisfies an integer multiple of 100KHz. Here, the first subcarrier whose frequency is higher than the DC subcarrier is the first subcarrier, and so on. The subcarriers occupied by the PSS/SSS are the 55th subcarrier to the 66th subcarrier. The offset between the narrowbands of PBCH relative to PSS/SSS is 18 subcarriers in the direction of low frequency, that is, the 37th subcarrier to the 48th subcarrier. In this way, PBCH can be sent on one PRB, reducing transmission to legacy UEs Impact.

Alternatively, the frequency offset information may be included in the PSS/SSS. For example, the frequency offset information is included in the SSS. The frequency offset is selected from a preset set.

Preferred embodiment five:

In the preferred embodiment, multiple channels are transmitted over multiple narrowbands. This preferred embodiment is described by taking the NB-IoT system as an example. In practical applications, it is not limited to the application in the NB-IoT system, and can also be used in other systems.

Several transmission methods are given below.

method one:

PSS/SSS is transmitted on a narrow band. Preferably, the central subcarrier of the PSS/SSS satisfies an integer multiple of 100KHz.

Except for PSS/SSS, other downlink channels are transmitted on one or more other narrowbands. Similar to the fourth preferred embodiment, the narrowband of the PBCH can be obtained through preset or information contained in the PSS/SSS. The narrowband where the SIB is located is notified in the PBCH, for example, the PRB information of the narrowband where the SIB is located is notified in the MIB, for example, the index of the PRB where the SIB narrowband is located is given. Or the MIB notifies the offset information of the narrowband where the SIB is located relative to the narrowband where the MIB is located, such as offsetting 2 PRBs to the side with a higher frequency. The cheap information may be an integer number of PRBs, or an integer number of subcarriers. The UE receives the SIB according to the offset information.

Optionally, the SIB may include narrowband information where the downlink control channel and/or PDSCH are located, or offset information relative to the narrowband where the SIB is located, where the downlink control channel includes PDCCH and/or EPDCCH.

Method 2:

Multiple channels are transmitted over multiple narrowbands according to the type/function of the message/channel.

The PSS/SSS/MIB is transmitted on the same narrowband, and the remaining downlink channels are transmitted on one or more other narrowbands. The MIB contains the narrowband information of the SIB1, or the MIB notifies the offset information of the narrowband where the SIB is located relative to the narrowband where the PSS/SSS/MIB is located.

Or, transmit PSS/SSS/MIB/SIB on the same narrowband, and transmit other downlink channels on one or more other narrowbands. The SIB includes narrowband information of the downlink control channel and/or PDSCH, or the SIB notifies the offset information of the narrowband where the downlink control channel and/or PDSCH is located relative to the narrowband where the MIB is located. Further, the SIB indicates the RAR, the downlink control information for scheduling the RAR, the paging message, and the narrowband information for the downlink control information for scheduling the paging message.

Or, transmit PSS/SSS/MIB/SIB and all public messages on the same narrowband, where the public messages include RAR, downlink control information for scheduling RAR, paging messages, and downlink control information for scheduling paging messages. The UE's unicast information is sent on other narrowbands, and the eNB indicates to the UE in the SIB the downlink control channel and/or PDSCH narrowband for the UE to receive the unicast information.

Or, transmit PSS/SSS/MIB/SIB and part of public messages on the same narrowband, where the public messages include RAR, downlink control information for scheduling RAR, paging message, and downlink control information for scheduling paging message. The eNB indicates in the SIB the narrowbands where the rest of the public messages are located and the narrowbands of the UE's unicast information.

Or, PSS/SSS/MIB/SIB and all/part of the public messages are transmitted on a narrowband, and the UE receives downlink signals on the narrowband before receiving the narrowband information sent by the eNB to detect the downlink control channel. If the UE receives the narrowband information for detecting the downlink control channel, the UE detects the downlink control channel on the narrowband. The eNB includes the narrowband information in the RRC signaling sent to the UE, or includes the narrowband information in message 4.

Optionally, the downlink control channel and the PDSCH may be in the same narrowband, for example, only the narrowband of the downlink control channel is notified in the SIB, and the narrowband of the PDSCH is the same as the narrowband of the downlink control information. There may be only one or multiple narrowbands of the downlink control channel, and the UE receives the downlink control channel on one narrowband according to preset rules, for example, determined according to the C-RNTI.

Method 3:

All narrowbands are independently operated narrowbands, that is, all downlink channels/information are sent on each narrowband, including PSS/SSS, PBCH, SIB, RAR, paging messages, downlink control channels and downlink data channels.

Method 4:

Some narrowbands are independently operated narrowbands, that is, all downlink channels/information are sent on the narrowbands, including PSS/SSS, PBCH, SIB, RAR, paging messages, downlink control channels and downlink data channels. The remaining narrowbands are narrowbands that only support unicast data, and are used to send UE-specific downlink control channels and PDSCHs.

Among the above modes, for modes 3 and 4, the UE can always work on a narrowband. For all methods, the UE can perform frequency hopping transmission. Here, the frequency hopping transmission can be frequency hopping to a narrowband to receive certain information. For example, for method 1, the UE receives the synchronization signal on the PSS/SSS narrowband, and then frequency hops to A downlink control channel is detected on a certain narrowband. Frequency hopping transmission can also be frequency hopping transmission on multiple narrowbands in order to improve the performance of a certain transmission. For example, in a coverage enhancement scenario, if a UE needs to repeatedly transmit 20 subframes, the UE performs frequency hopping transmission on multiple narrowbands to increase frequency diversity gain and improve transmission performance.

Preferred embodiment six:

This preferred embodiment provides a method for obtaining uplink narrowband. This preferred embodiment is described by taking the NB-IoT system as an example, and the proposed method is not limited to be applied in the NB-IoT system.

The eNB notifies the UE of the uplink carrier frequency N _UL corresponding to the system bandwidth, and the UE can obtain the center frequency of the uplink system bandwidth F _UL ′=F _{UL_LOW} +0.1(N _UL -N _Offs-UL ) according to N _UL , where F _{UL_LOW} is the The minimum frequency of the uplink operation band corresponding to the N _UL is in MHz, and the uplink operation band corresponding to the N _UL is the operation frequency band where the uplink narrowband is located. N _Offs-UL is an offset value corresponding to the uplink working frequency band, which is a constant, for example, for band#1, N _Offs-UL is 18000.

The frequency domain position of the uplink narrowband satisfies:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.015n _UL

Wherein, n _UL is an integer. That is to say, the center frequency point of the uplink narrowband is shifted from the center frequency point of the uplink system bandwidth to a lower or higher frequency direction by an integer multiple of subcarriers.

or,

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.09n _UL

Wherein, n _UL is an integer. That is to say, the center frequency point of the uplink narrowband is an integer multiple of half a PRB shifted from the center frequency point of the uplink system bandwidth to a lower or higher frequency direction. When the system bandwidth is even, the center frequency of the uplink narrowband is an odd multiple of half a PRB shifted from the center frequency of the uplink system bandwidth to the direction of low or high frequency; when the system bandwidth is odd, the center frequency of the uplink narrowband The central frequency point of the uplink system bandwidth is shifted to a low or high frequency direction by an even multiple of half a PRB.

Optionally, the frequency domain position of the uplink narrowband is obtained in a preset manner, for example, the aforementioned n _UL is a preset value.

Optionally, the preset or eNB notifies the UE of the DC location information of the system bandwidth, and the frequency domain location of the uplink narrowband is obtained according to the information. For example, the eNB notifies the UE of DC and downlink narrowband offset information, which may be included in the SIB. For example, the eNB notifies the UE that the DC is the kth subcarrier in the direction of low frequency, or the kth subcarrier and the k+1th subcarrier of the downlink narrowband center frequency point/center subcarrier/start subcarrier/stop subcarrier The middle position, or the center frequency point/center subcarrier/start subcarrier/end subcarrier of the downlink narrowband is the kth subcarrier in the direction of high frequency from DC, or the kth subcarrier and the k+1th subcarrier middle position. Among them, it is assumed that the downlink narrowband occupies N subcarriers, and the subcarrier indexes are from 0 to N-1 from the lowest frequency to the highest frequency. If N is an even number, the center frequency point is subcarrier #(N/2-1) and subcarrier #n In the middle position, the center subcarrier is subcarrier (N/2-1) or N, the start subcarrier is 0, and the end subcarrier is N-1. For example, the downlink narrowband occupies 12 subcarriers, and the subcarrier indexes range from 0 to 11 from the lowest frequency to the highest, then the center frequency point is the middle position between subcarriers #5 and 6, and the center subcarrier is subcarrier 5 or 6. The subcarrier is 0, and the cutoff subcarrier is 11. If N is an odd number, the center frequency point is the center frequency point of the subcarrier #(N/2), the center subcarrier is the subcarrier (N/2), and the starting subcarrier is 0, the cutoff subcarrier is N-1. Assume that the start subcarrier/cutoff subcarrier/center subcarrier of the downlink narrowband is the n1th subcarrier whose frequency is higher/lower than DC, and the start subcarrier/cutoff subcarrier of the uplink narrowband The carrier/center subcarrier is the n2th subcarrier above/below the center frequency point, where n1=n2, or n1-n2=c, where c is an integer and is a preset constant. Or, the center frequency point of the downlink narrowband is higher/lower than the center frequency point of the downlink system bandwidth by f1, and the center frequency point of the uplink narrowband is higher/lower than the center frequency point of the uplink system bandwidth by f2, wherein f1=f2, or f1-f2=c, where c=(15m+7.5)KHz, or c=(15m)KHz where m is an integer.

Optionally, the eNB may also notify the UE of the offset value between the center frequency points of the uplink narrowband and the uplink system bandwidth. The offset value may be an offset value between the start subcarrier/end subcarrier/center frequency point/center subcarrier of the uplink narrowband and the center frequency point of the uplink system bandwidth. After obtaining the center frequency point of the uplink system bandwidth, the UE obtains the position of the uplink narrowband according to the offset value, which can indicate an integer multiple of subcarriers, or an integer multiple of PRBs, such as n _UL in the above formula .

Optionally, the eNB notifies the UE of the system bandwidth information, and notifies the UE of the PRB index corresponding to the uplink narrowband, then the UE can obtain the position of the uplink narrowband according to the system bandwidth and the PRB index. Optionally, the eNB notifies the frequency offset between the PRB index corresponding to the uplink narrowband and the PRB index corresponding to the downlink narrowband. Carrier/end subcarrier/center frequency point/PRB index where the center subcarrier is located.

Preferred embodiment seven:

This preferred embodiment provides a method for obtaining uplink narrowband. This preferred embodiment is described by taking the NB-IoT system as an example, and the proposed method is not limited to be applied in the NB-IoT system.

The eNB notifies the UE of the uplink carrier frequency N _UL corresponding to the system bandwidth, and the UE can obtain the center frequency of the uplink system bandwidth F _UL ′=F _{UL_LOW} +0.1(N _UL -N _Offs-UL ) according to N _UL , where F _{UL_LOW} is the The lowest frequency of the uplink working frequency band Operation Band corresponding to the N _UL , the unit is MHz, N _Offs-UL is the offset value corresponding to the uplink working frequency band, which is a constant, for example, for band#1, N _Offs-UL for 18000.

The frequency domain position of the uplink narrowband satisfies:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.015n _UL

Wherein, n _UL is an integer. That is to say, the center frequency point of the uplink narrowband is shifted from the center frequency point of the uplink system bandwidth to a lower or higher frequency direction by an integer multiple of subcarriers.

Further, the frequency domain position of the uplink frequency point can satisfy the following formula:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.09n _UL

Wherein, n _UL is an integer. That is to say, the center frequency point of the uplink narrowband is an integer multiple of half a PRB shifted from the center frequency point of the uplink system bandwidth to a lower or higher frequency direction. When the system bandwidth is even, the center frequency of the uplink narrowband is an odd multiple of half a PRB shifted from the center frequency of the uplink system bandwidth to the direction of low or high frequency; when the system bandwidth is odd, the center frequency of the uplink narrowband The central frequency point of the uplink system bandwidth is shifted to a low or high frequency direction by an even multiple of half a PRB.

Further, when the UE knows that the system bandwidth is an odd-numbered bandwidth or an even-numbered bandwidth, the frequency domain position of the uplink frequency point may be determined in the following manner. If the system bandwidth is an odd bandwidth, such as 3MHz/5MHz/15MHz, the frequency domain position of the uplink frequency point can satisfy the following formula:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.18n _UL

Wherein, n _UL is an integer. That is to say, the center frequency point of the uplink narrowband is an integer multiple of the PRB shifted from the center frequency point of the uplink system bandwidth to a lower or higher frequency direction.

If the system bandwidth is an even bandwidth, such as 10MHz/20MHz, the frequency domain position of the uplink frequency point can satisfy the following formula:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.09(2n _UL +1)

Wherein, n _UL is an integer. That is to say, the center frequency point of the uplink narrowband is an odd multiple of half a PRB shifted from the center frequency point of the uplink system bandwidth to a lower or higher frequency direction.

Optionally, the frequency domain position of the uplink narrowband is obtained in a preset manner, for example, the aforementioned n _UL is a preset value.

Optionally, the preset or eNB notifies the UE of the DC location information of the system bandwidth, and the frequency domain location of the uplink narrowband is obtained according to the information. For example, the eNB notifies the UE of DC and downlink narrowband offset information, which may be included in the SIB. For example, the eNB notifies the UE that the DC is the kth subcarrier in the direction of low frequency, or the kth subcarrier and the k+1th subcarrier of the downlink narrowband center frequency point/center subcarrier/start subcarrier/stop subcarrier The middle position, or the center frequency point/center subcarrier/start subcarrier/end subcarrier of the downlink narrowband is the kth subcarrier in the direction of high frequency from DC, or the kth subcarrier and the k+1th subcarrier middle position. Among them, it is assumed that the downlink narrowband occupies N subcarriers, and the subcarrier indexes are from 0 to N-1 from the lowest frequency to the highest frequency. If N is an even number, the center frequency point is subcarrier #(N/2-1) and subcarrier #n In the middle position, the center subcarrier is subcarrier (N/2-1) or N, the start subcarrier is 0, and the end subcarrier is N-1. For example, the downlink narrowband occupies 12 subcarriers, and the subcarrier indexes range from 0 to 11 from the lowest frequency to the highest, then the center frequency point is the middle position between subcarriers #5 and 6, and the center subcarrier is subcarrier 5 or 6. The subcarrier is 0, and the cutoff subcarrier is 11. If N is an odd number, the center frequency point is the center frequency point of the subcarrier #(N/2), the center subcarrier is the subcarrier (N/2), and the starting subcarrier is 0, the cutoff subcarrier is N-1. Assume that the start subcarrier/cutoff subcarrier/center subcarrier of the downlink narrowband is the n1th subcarrier whose frequency is higher/lower than DC, and the start subcarrier/cutoff subcarrier of the uplink narrowband The carrier/center subcarrier is the n2th subcarrier above/below the center frequency point, where n1=n2, or n1-n2=c, where c is an integer and is a preset constant. Or, the center frequency point of the downlink narrowband is higher/lower than the center frequency point of the downlink system bandwidth by f1, and the center frequency point of the uplink narrowband is higher/lower than the center frequency point of the uplink system bandwidth by f2, wherein f1=f2, or f1-f2=c, where c=(15m+7.5)KHz, or c=(15m)KHz where m is an integer.

Optionally, the eNB may also notify the UE of the offset value between the center frequency points of the uplink narrowband and the uplink system bandwidth. The offset value may be an offset value between the start subcarrier/end subcarrier/center frequency point/center subcarrier of the uplink narrowband and the center frequency point of the uplink system bandwidth. After obtaining the center frequency point of the uplink system bandwidth, the UE obtains the position of the uplink narrowband according to the offset value, which can indicate an integer multiple of subcarriers, or an integer multiple of PRBs, such as n _UL in the above formula .

Optionally, the eNB notifies the UE of the system bandwidth information, and notifies the UE of the PRB index corresponding to the uplink narrowband, then the UE can obtain the position of the uplink narrowband according to the system bandwidth and the PRB index. Optionally, the eNB notifies the frequency offset between the PRB index corresponding to the uplink narrowband and the PRB index corresponding to the downlink narrowband. Carrier/end subcarrier/center frequency point/PRB index where the center subcarrier is located.

Optionally, for the inband scenario, the uplink narrowband should be a PRB in the system, and for the guard band scenario, the uplink narrowband may not be aligned with the PRB.

Preferred embodiment eight:

This preferred embodiment provides a method for obtaining uplink narrowband. This preferred embodiment is described by taking the NB-IoT system as an example, and the proposed method is not limited to be applied in the NB-IoT system.

The eNB notifies the UE of the uplink carrier frequency N _UL corresponding to the uplink narrowband. The UE can obtain the center frequency of the uplink narrowband according to N _UL . The center frequency of the uplink narrowband is:

F _UL =F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.01n _UL ,

Where n _UL is an integer.

Preferably, n _UL ∈{-4,-3,-2,-1,0,1,2,3,4,5}

Or, n _UL ∈ {-5,-4,-3,-2,-1,0,1,2,3,4}

Or, n _UL ∈ {0,1,2,3,4,5,6,7,8,9}

Wherein F _{UL_LOW} is the lowest frequency of the uplink working frequency band Operation Band corresponding to the N _UL , and the unit is MHz, and N _Offs-UL is the offset value corresponding to the uplink working frequency band, which is a constant, for example, for band#1 , N _Offs-UL is 18000.

Optionally, the n _UL is preset, such as fixed to 0, or the n _UL is notified by the eNB, which can be notified in the SIB, or notified in the RRC signaling, for example, the eNB uses 4 bits to indicate the n _UL , or This information may also be jointly coded with other information for indication.

Preferred embodiment nine:

This preferred embodiment provides a method for obtaining uplink narrowband. This preferred embodiment is described by taking the NB-IoT system as an example, and the proposed method is not limited to be applied in the NB-IoT system.

The UE obtains the downlink center frequency point obtained by channel raster frequency scanning, and obtains the default UE transmission-reception frequency interval Default UETX-RX frequency separationΔf corresponding to the operation frequency band according to the operation band of the downlink center frequency point, and then according to The downlink frequency point and the sending-receiving center frequency interval are used to obtain the uplink center frequency point, and the uplink center frequency point is:

F _UL =F _DL -Δf+0.015n _UL

Among them, F _DL is the center frequency point of the downlink narrowband or the center frequency point of the downlink center subcarrier. The center frequency point of the downlink center subcarrier can be referred to as the frequency point of _the downlink center subcarrier. The number of subcarriers offset by the uplink center frequency point obtained by receiving the center frequency interval. The n _UL may be preset, such as 0, or may be notified by the eNB, such as indicated in the SIB. Optionally, the n _UL may be an integer between 0 and 11, or an integer between -5 and 6, or an integer between -6 and 5.

or,

F _UL =F _DL -Δf+0.09n _UL

Wherein, n _UL is an integer, which means that the uplink center frequency obtained from the transmit-receive center frequency interval is shifted by an integer multiple of half a PRB in the direction of high/low frequency. The n _UL may be preset, such as 0, or may be notified by the eNB, such as indicated in the SIB. Optionally, the n _UL may be an integer between -110 and 110.

Preferred embodiment ten:

This preferred embodiment provides a method for obtaining uplink narrowband. This preferred embodiment is described by taking the NB-IoT system as an example, and the proposed method is not limited to be applied in the NB-IoT system.

The center frequency point of the uplink narrowband is:

F _UL =F _DL '-Δf+0.09n _UL ;

Among them, F _UL is the center frequency point of the uplink narrowband, F _DL ′ is the center frequency point of the downlink system bandwidth, Δf is the default UE sending-receiving frequency interval, the unit of F _UL and F _DL ′ is MHz, and n _UL is Frequency offset value, n _UL is an integer.

F _DL ' may be notified by the eNB to the UE, for example, the eNB notifies the UE of the frequency interval between the center of the system bandwidth and the center subcarrier of the downlink narrowband.

Preferred embodiment eleven:

This preferred embodiment provides a method for obtaining uplink narrowband. This preferred embodiment is described by taking the NB-IoT system as an example, and the proposed method is not limited to be applied in the NB-IoT system.

The UE obtains the downlink center frequency point obtained by channel raster frequency scanning, and according to the downlink center frequency point working frequency band Operation Band, obtains the default UE sending-receiving frequency interval corresponding to the working frequency band, and then according to the downlink frequency point and The uplink center frequency point is obtained from the sending-receiving center frequency interval, and the uplink center frequency point is:

F _UL ＝ F _DL -Δf+0.015n _UL +x·0.0075

Wherein, F _DL is the center frequency point of the downlink narrowband, and n _UL is an integer, indicating the number of subcarriers offset by the uplink center frequency point relative to the transmit-receive center frequency interval. The n _UL may be preset, such as 0, or may be notified by the eNB, such as indicated in the SIB. Optionally, the n _UL may be an integer between 0 and 11, or an integer between -5 and 6, or an integer between -6 and 5. x is 1 or -1 to ensure that the center of the uplink frequency point is also between the two subcarriers when the center frequency point of the downlink is between the two subcarriers.

or,

F _UL ＝ F _DL -Δf+0.09n _UL +x·0.0075

Wherein, n _UL is an integer, which means that the uplink center frequency obtained from the transmit-receive center frequency interval is shifted by an integer multiple of half a PRB in the direction of high/low frequency. The n _UL may be preset, such as 0, or may be notified by the eNB, such as indicated in the SIB. Optionally, the n _UL may be an integer between -110 and 110.

Preferred embodiment twelve:

The center frequency point of the downlink narrowband/center frequency point of the center subcarrier satisfies:

F _DL ＝F _{DL_LOW} +0.1(N _DL -N _Offs-DL )

Wherein F _{DL_LOW} is the lowest frequency of the downlink operating band Operation Band corresponding to the N _DL , in MHz, and N _Offs-DL is the offset value corresponding to the downlink operating frequency band, which is a constant, for example, for band#1 , N _Offs-DL is 0.

Optionally, the center frequency point of the downlink narrowband/center frequency point of the center subcarrier satisfies:

F _DL ＝F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.3n _DL

Wherein, N _DL is N _DL corresponding to the central frequency point of the system bandwidth, and n _DL is an integer, preset, or configured by the eNB, for example, configured by the eNB for the UE, or determined according to information configured by the eNB for the UE.

Optionally, n _DL is an integer ranging from -3 to -29 or from 3 to 29.

Optionally, for NB-IoT working on the guard band, the center frequency point of the downlink narrowband/center frequency point of the center subcarrier satisfies:

F _DL ＝F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.2n _DL

Wherein, N _DL is N _DL corresponding to the central frequency point of the system bandwidth, and n _DL is preset or configured by the eNB, such as configured by the eNB for the UE, or determined according to information configured by the eNB for the UE. Optionally, the minimum value of n _DL is determined by the system bandwidth of the cell.

Preferred embodiment thirteen:

In the LTE system, the uplink digital baseband and the analog baseband are staggered by 7.5KHz, that is, half a subcarrier. For the NB-IoT scenario, a subcarrier width transmission of 3.75KHz is introduced. In order to avoid interference with legacy UEs, Then the uplink digital baseband and the analog baseband should also be staggered by 7.5 KHz, that is, 7.5/3.75=2 subcarriers are staggered. If the uplink adopts 2.5 kHz sub-carrier width for transmission, 7.5/2.5=3 sub-carriers need to be staggered.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

It should be noted that each of the above-mentioned modules can be implemented by software or hardware. For the latter, it can be implemented in the following manner, but not limited to this: the above-mentioned modules are all located in the same processor; or, the above-mentioned modules are respectively located in multiple in the processor.

The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the foregoing storage medium may be configured to store program codes for executing the method steps of the foregoing embodiments:

Optionally, in this embodiment, the above-mentioned storage medium may include but not limited to: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk Various media that can store program codes such as discs or optical discs.

Optionally, in this embodiment, the processor executes the method steps of the foregoing embodiments according to the program code stored in the storage medium.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details are not repeated in this embodiment.

Obviously, those skilled in the art should understand that each module or each step of the present invention described above can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (23)

1. A method for transmitting information, comprising:

the network equipment determines frequency offset information;

determining a narrow band for transmitting information according to the frequency offset information, and transmitting information on the narrow band;

wherein the frequency offset information includes one of:

the frequency offset information carried in the master system information block MIB, wherein the frequency offset information indicates a frequency offset of a first narrowband and a second narrowband, and the first narrowband is a narrowband transmitting at least one of the following: system information block SIB, RAR, paging message, downlink control channel and PDSCH, the second narrowband being a narrowband transmitting at least one of: primary synchronization signal PSS, secondary synchronization signal SSS, and physical broadcast channel PBCH;

the frequency offset information carried in SIB, wherein the frequency offset information indicates a frequency offset of a third narrowband and a fourth narrowband, and the third narrowband is a narrowband transmitting at least one of the following: a random access response RAR, a paging message, a downlink control channel and a physical downlink shared channel PDSCH, wherein the fourth narrowband is a narrowband for transmitting at least one of the following: PSS, SSS, PBCH and SIBs;

The frequency offset information carried in SIBx, wherein the frequency offset information indicates a frequency offset between a fifth narrowband and a sixth narrowband, and the fifth narrowband is a narrowband transmitting at least one of the following: RAR, paging message, downlink control channel and PDSCH, SIB other than SIBx, the sixth narrowband being a narrowband transmitting at least one of: PSS, SSS, PBCH and SIBx, wherein the SIBx is a specified SIB message;

the frequency offset information carried in the primary synchronization signal PSS and the secondary synchronization signal SSS, wherein the frequency offset information indicates a frequency offset of a seventh narrowband and an eighth narrowband, wherein the seventh narrowband is a narrowband transmitting at least one of: PBCH, SIB, RAR, paging message, downlink control channel and PDSCH, the eighth narrowband being a narrowband transmitting at least one of: PSS and SSS.

2. The method of claim 1, wherein the network device determining frequency offset information comprises one of:

determining the frequency offset information according to predefined information;

and receiving notification information of the network equipment to determine the frequency offset information.

3. The method of claim 2, wherein the step of determining the position of the substrate comprises,

The first narrowband, the third narrowband, the fifth narrowband, and the seventh narrowband are one physical resource block PRB in a long-term evolution LTE system.

4. The method of claim 2, wherein the step of determining the position of the substrate comprises,

and the center frequency points of the center subcarriers of the second narrow band, the fourth narrow band, the sixth narrow band and the eighth narrow band meet the integral multiple of 100 KHz.

5. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the frequency offset information indicates the number of offset subcarriers.

6. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the absolute value of the frequency offset X indicated by the frequency offset information is less than or equal to Y subcarriers, X is an integer,

y is a preset positive integer.

7. The method of claim 6, wherein the step of providing the first layer comprises,

x is an integer between-5 and 6, alternatively an integer between-6 and 5, alternatively an integer between 0 and 11.

8. The method of claim 1, wherein the frequency offset information comprises:

the frequency offset information carried in the MIB or SIB is an offset between a specified narrowband and a preset frequency, where the specified narrowband is a narrowband transmitting at least one of the following: PSS, SSS, PBCH, SIB, RAR, paging message, downlink control channel and PDSCH.

9. The method of claim 8, wherein the step of determining the position of the first electrode is performed,

the preset frequency is an integer multiple of 100 KHz.

10. The method of claim 8, wherein the step of determining the position of the first electrode is performed,

the specified narrowband is one PRB in the LTE system.

11. The method of claim 8, comprising one of the following

The frequency offset indicated by the frequency offset information is an integer multiple or an odd multiple of 2.5 KHz;

the frequency offset information is a frequency offset corresponding to an index in a predefined set.

12. The method of claim 2, wherein the step of determining the position of the substrate comprises,

in the case that the narrowband is an uplink narrowband, the frequency offset information is one of:

the frequency offset between the center frequency points of the uplink narrow band and the uplink system bandwidth;

a frequency offset between the upstream narrowband and an integer multiple of 100 KHz;

and the frequency offset between the uplink narrow band and the designated frequency point is determined by a default UE transmitting-receiving frequency interval.

13. The method of claim 1, wherein the step of determining the position of the substrate comprises,

when the narrowband is an uplink narrowband, the frequency domain location information is a PRB index corresponding to the uplink narrowband.

14. The method according to claim 2 or 12, wherein,

the predefined information or notification information includes at least one of:

a system bandwidth;

PRB information corresponding to the uplink narrowband;

PRB information corresponding to downlink narrowband;

offset of Direct Current (DC) subcarriers of downlink narrow band and system bandwidth;

the difference between the PRB index corresponding to the uplink narrow band and the PRB index corresponding to the downlink narrow band;

the first value is a frequency offset value between the uplink narrow band and the central frequency point of the uplink system bandwidth, and the second value is a frequency offset value between the downlink narrow band and the central frequency point of the downlink system bandwidth.

15. The method according to claim 1 or 12, wherein,

and under the condition that the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is as follows:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.015n _UL ；

or,

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.09n _UL ；

wherein F is _UL Is the center frequency point of the uplink narrow band, F _{UL_LOW} For the lowest frequency, N, of the operating frequency band in which the uplink narrowband is located _UL Is the uplink carrier frequency corresponding to the system bandwidth, N _Offs-UL N is the offset value corresponding to the working frequency band where the uplink narrow band is located _UL For the frequency offset value, n _UL Is an integer of F _UL 、F _{UL_LOW} 、N _UL And N _Offs-UL The units are MHz.

16. The method according to claim 1 or 12, wherein,

and under the condition that the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is as follows:

F _UL ＝F _{UL_LOW} +0.1(N _UL -N _Offs-UL )+0.01n _UL

wherein F is _UL Is the center frequency point of the uplink narrow band, F _{UL_LOW} For the lowest frequency, N, of the operating frequency band in which the uplink narrowband is located _UL Is the uplink carrier frequency corresponding to the uplink narrow band, N _Offs-UL N is an offset value corresponding to the working frequency band where the uplink narrow band is located _UL For the frequency offset value, n _UL Is an integer of F _UL 、F _{UL_LOW} 、N _UL And N _Offs-UL The units are MHz.

17. The method of claim 16, wherein the step of determining the position of the probe comprises,

n _UL ∈{-4,-3,-2,-1,0,1,2,3,4,5}，

alternatively, n _UL ∈{-5,-4,-3,-2,-1,0,1,2,3,4}；

Alternatively, n _UL ∈{0,1,2,3,4,5,6,7,8,9}。

18. The method according to claim 1 or 12, wherein,

and under the condition that the narrowband is an uplink narrowband, the center frequency point of the uplink narrowband is as follows:

F _UL ＝F _DL -Δf+0.015n _UL ；

or,

F _UL ＝F _DL -Δf+0.09n _UL ；

wherein F is _UL Is the center frequency point of the uplink narrow band, F _DL For the frequency of the center frequency point or the center subcarrier of the downlink narrowband, Δf is the default UE transmit-receive frequency interval, F _UL And F _DL The units are MHz and n _UL For the frequency offset value, n _UL Is an integer.

19. The method of claim 12, wherein the step of determining the position of the probe is performed,

the center frequency point of the uplink narrow band is as follows:

F _UL ＝F _DL ′-Δf+0.09n _UL ；

wherein F is _UL Is the center frequency point of the uplink narrow band, F _DL ' is the center frequency point of the downlink system bandwidth, Δf is the default UE transmit-receive frequency interval, F _UL And F _DL ' units are MHz, n _UL For the frequency offset value, n _UL Is an integer.

20. The method of claim 12, wherein the step of determining the position of the probe is performed,

the center frequency point of the uplink narrow band is as follows:

F _UL ＝F _DL -Δf+0.015n _UL +x·0.0075；

or,

F _UL ＝F _DL -Δf+0.09n _UL +x·0.0075；

wherein F is _UL Is the center frequency point of the uplink narrow band, F _DL For the frequency of the center frequency point or the center subcarrier of the downlink narrowband, Δf is the default UE transmit-receive frequency interval, F _UL And F _DL The units are MHz and n _UL For the frequency offset value, n _UL X is an integer, either 1 or-1, x being either predefined or indicated by higher layer signaling.

21. The method according to claim 1 or 12, wherein,

and under the condition that the narrowband is a downlink narrowband, the center frequency point of the downlink narrowband is as follows:

F _DL ＝F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.3n _DL ；

or,

F _DL ＝F _{DL_LOW} +0.1(N _DL -N _Offs-DL )+0.2n _DL ；

wherein F is _DL F, the frequency of the central frequency point or the central subcarrier of the downlink narrow band _{DL_LOW} For the lowest frequency, N, of the operating frequency band in which the downlink narrowband is located _DL For the downlink carrier frequency corresponding to the system bandwidth, N _Offs-DL N is an offset value corresponding to the working frequency band where the downlink narrow band is located _DL For the frequency offset value, n _DL Is an integer of F _DL 、F _{DL_LOW} 、N _DL And N _Offs-DL The units are MHz.

22. An information transmission apparatus, located in a network device, comprising:

a determining module, configured to determine frequency offset information by a network device;

the transmission module is used for determining a narrow band for transmitting information according to the frequency offset information and transmitting information on the narrow band;

wherein the frequency offset information includes one of:

the frequency offset information carried in the master system information block MIB, wherein the frequency offset information indicates a frequency offset of a first narrowband and a second narrowband, and the first narrowband is a narrowband transmitting at least one of the following: system information block SIB, RAR, paging message, downlink control channel and PDSCH, the second narrowband being a narrowband transmitting at least one of: primary synchronization signal PSS, secondary synchronization signal SSS, and physical broadcast channel PBCH;

the frequency offset information carried in SIB, wherein the frequency offset information indicates a frequency offset of a third narrowband and a fourth narrowband, and the third narrowband is a narrowband transmitting at least one of the following: a random access response RAR, a paging message, a downlink control channel and a physical downlink shared channel PDSCH, wherein the fourth narrowband is a narrowband for transmitting at least one of the following: PSS, SSS, PBCH and SIBs;

The frequency offset information carried in SIBx, wherein the frequency offset information indicates a frequency offset between a fifth narrowband and a sixth narrowband, and the fifth narrowband is a narrowband transmitting at least one of the following: RAR, paging message, downlink control channel and PDSCH, SIB other than SIBx, the sixth narrowband being a narrowband transmitting at least one of: PSS, SSS, PBCH and SIBx, wherein the SIBx is a specified SIB message;

the frequency offset information carried in the primary synchronization signal PSS and the secondary synchronization signal SSS, wherein the frequency offset information indicates a frequency offset of a seventh narrowband and an eighth narrowband, wherein the seventh narrowband is a narrowband transmitting at least one of: PBCH, SIB, RAR, paging message, downlink control channel and PDSCH, the eighth narrowband being a narrowband transmitting at least one of: PSS and SSS.

23. The apparatus of claim 22, wherein the determining means comprises one of:

the self-defining unit is used for determining the frequency offset information according to the predefined information;

and the receiving unit is used for receiving the notification information of the network equipment and determining the frequency offset information.

Images