CN110602740B - Method, device, storage medium and user equipment for determining same frequency interference - Google Patents
Method, device, storage medium and user equipment for determining same frequency interference Download PDFInfo
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- CN110602740B CN110602740B CN201910894959.7A CN201910894959A CN110602740B CN 110602740 B CN110602740 B CN 110602740B CN 201910894959 A CN201910894959 A CN 201910894959A CN 110602740 B CN110602740 B CN 110602740B
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Abstract
The disclosure relates to a method, a device, a storage medium and a user equipment for determining co-channel interference, so as to reduce the computational complexity and power consumption of the user equipment in the process of determining co-channel interference. The method is applied to the user equipment in the narrowband Internet of things NB-IoT, and comprises the following steps: acquiring configuration information of a Narrowband Reference Signal (NRS) sequence of a serving cell, wherein the configuration information comprises at least one subframe with zero power in each repetition period in the NRS sequence; determining an NRS sequence of an interference neighbor cell; determining target subframes which are respectively the same as the subframe numbers of the at least one subframe in the NRS sequence of the interference neighbor cell; and calculating the co-channel interference of the interference adjacent cell at the target subframe.
Description
Technical Field
The present disclosure relates to the field of internet of things technology, and in particular, to a method, an apparatus, a storage medium, and a user equipment for determining co-channel interference.
Background
The same frequency interference means that the carrier frequency of the useless signal is the same as that of the useful signal, and the interference is caused to a receiver receiving the same frequency useful signal. In NB-IoT (Narrow Band Internet of Things), due to limited spectrum resources, the NB-IoT selects a co-frequency networking mode, and therefore co-frequency interference among a plurality of adjacent cells is inevitably brought.
In the related art, in order to determine the co-channel interference, a signal of an interfering neighbor cell is generally reconstructed at a user equipment. Specifically, according to parameters such as a physical cell ID and a system frame number received by user equipment, pilot sequences of all cells including a serving cell and an interfering neighbor cell are generated, then, according to baseband data and the pilot sequences, channel estimation is performed on all the cells, and an interfering signal of the neighbor cell is reconstructed according to the channel estimation. In this process, the ue needs to perform an iterative subtraction process between the pilot sequences of the serving cell and the interfering neighbor cell to obtain the co-channel interference, which increases the computational complexity and power loss of the ue and cannot better meet the low power requirement of the NB-IoT ue.
Disclosure of Invention
The present disclosure provides a method, an apparatus, a storage medium, and a user equipment for determining co-channel interference, so as to reduce the computational complexity and power consumption of the user equipment in the process of determining co-channel interference.
In order to achieve the above object, in a first aspect, the present disclosure provides a method for determining co-channel interference, where the method is applied to a user equipment in a narrowband internet of things NB-IoT, and the method includes:
acquiring configuration information of a Narrowband Reference Signal (NRS) sequence of a serving cell, wherein the configuration information comprises at least one subframe with zero power in each repetition period in the NRS sequence;
determining an NRS sequence of an interference neighbor cell;
determining target subframes which are respectively the same as the subframe numbers of the at least one subframe in the NRS sequence of the interference neighbor cell;
and calculating the co-channel interference of the interference adjacent cell at the target subframe.
Optionally, the method further comprises:
determining a target signal subframe different from a subframe number of the at least one subframe in a signal sequence received by the user equipment;
and for the signal sequence received by the user equipment, subtracting the same frequency interference from the target signal subframe to obtain the signal sequence sent to the user equipment by the serving cell.
Optionally, the configuration information further includes a repetition period of an NRS sequence of the serving cell and a starting subframe of a zero-power narrowband reference signal in each repetition period, and the method further includes:
acquiring a physical cell ID of the interference neighbor cell and a timing deviation of the interference neighbor cell relative to the serving cell;
the determining the NRS sequence of the interference neighbor cell comprises the following steps:
determining a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interference neighbor cell according to the timing deviation and the repetition period and the starting subframe which are included in the configuration information;
and determining the NRS sequence of the interference neighbor cell according to the initial subframe of the interference neighbor cell and the physical cell ID.
Optionally, after determining a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interfering neighbor according to the timing offset, the repetition period, and the starting subframe, the method further includes:
judging whether the starting subframe is a subframe for sending any one of a Narrowband Primary Synchronization Signal (NPSS), a Narrowband Secondary Synchronization Signal (NSSS) and a System Information Block (SIB);
and if the starting subframe is a subframe used for sending any one of a Narrowband Primary Synchronization Signal (NPSS), a Narrowband Secondary Synchronization Signal (NSSS) and a System Information Block (SIB), taking the next subframe of the starting subframe as the starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interference neighbor cell.
In a second aspect, the present disclosure further provides an apparatus for determining co-channel interference, where the apparatus is applied to a user equipment in a narrowband internet of things NB-IoT, and the apparatus includes:
a first obtaining module, configured to obtain configuration information of a narrowband reference signal NRS sequence of a serving cell, where the configuration information includes at least one subframe having zero power in each repetition period in the NRS sequence;
the first determining module is used for determining an NRS sequence of an interference neighbor cell;
a second determining module, configured to determine, in an NRS sequence of the interfering neighbor cell, target subframes having the same subframe numbers as the subframe numbers of the at least one subframe, respectively;
and the calculation module is used for calculating the co-channel interference of the interference adjacent cell at the target subframe.
Optionally, the apparatus further comprises:
a third determining module, configured to determine, in the signal sequence received by the ue, a target signal subframe different from a subframe number of the at least one subframe;
and the processing module is used for subtracting the same frequency interference from the target signal subframe aiming at the signal sequence received by the user equipment to obtain the signal sequence sent to the user equipment by the serving cell.
Optionally, the configuration information further includes a repetition period of an NRS sequence of the serving cell and a starting subframe number of a zero-power narrowband reference signal in each repetition period, and the apparatus further includes:
a second obtaining module, configured to obtain a physical cell ID of the interfering neighbor cell and a timing offset of the interfering neighbor cell with respect to the serving cell;
the first determination module is to:
determining a starting subframe of a narrow-band reference signal in each repetition period in an NRS sequence of the interference neighbor cell according to the timing deviation and the repetition period and the starting subframe included in the configuration information;
and determining the NRS sequence of the interference neighbor cell according to the initial subframe of the interference neighbor cell and the ID of the physical cell.
Optionally, the apparatus further comprises:
a determining module, configured to determine, after determining a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interfering neighbor according to the timing offset, the repetition period, and the starting subframe, whether the starting subframe is a subframe used for sending any one of a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS, and a system information block SIB;
a subframe determining module, configured to, when the starting subframe is a subframe used for sending any one of a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS, and a system information block SIB, take a next subframe of the starting subframe as a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interfering neighbor cell.
In a third aspect, the present disclosure also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of any one of the first aspect.
In a fourth aspect, the present disclosure further provides a user equipment, which is applied to a narrowband internet of things, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any one of the first aspect.
Through the technical scheme, the power of at least one subframe is zero in each repetition period in the NRS sequence of the service cell, so after the NRS sequence of the interference neighbor cell is determined, the user equipment can directly calculate the same frequency interference at the subframe with zero power according to the received signal without performing iterative subtraction between the pilot frequency sequences of the service cell and the interference neighbor cell to obtain the same frequency interference, thereby reducing the calculation complexity of the user equipment in the process of determining the same frequency interference, reducing the power loss of the user equipment and better meeting the low power requirement of NB-IoT user equipment.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a prior art process for determining co-channel interference;
FIG. 2 is a flow chart illustrating a method of determining co-channel interference according to an exemplary embodiment of the present disclosure;
fig. 3 is a diagram illustrating an NRS sequence of a serving cell in a method of determining co-channel interference according to an exemplary embodiment of the present disclosure;
FIG. 4 is a block diagram illustrating an apparatus for determining co-channel interference according to an exemplary embodiment of the present disclosure;
fig. 5 is a block diagram illustrating a user equipment according to an exemplary embodiment of the present disclosure.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The same frequency interference means that the carrier frequency of the useless signal is the same as that of the useful signal, and the interference is caused to a receiver receiving the same frequency useful signal. In NB-IoT (Narrow Band Internet of Things), due to limited spectrum resources, NB-IoT can select a co-frequency networking mode, and therefore co-frequency interference among a plurality of adjacent regions is inevitably brought. In the related art, in order to determine the co-channel interference, a signal of an interfering neighbor cell is generally reconstructed at a user equipment. Specifically, according to parameters such as a physical cell ID and a system frame number received by user equipment, pilot sequences of all cells including a serving cell and an interfering neighbor cell are generated, then, according to baseband data and the pilot sequences, channel estimation is performed on all the cells, and an interfering signal of the neighbor cell is reconstructed according to the channel estimation.
For example, referring to fig. 1, there is a serving cell a and three interfering neighboring cells B1, B2, and B3, in order to determine the co-channel interference of the three interfering neighboring cells, a pilot sequence of all cells including the serving cell a and the three interfering neighboring cells B1, B2, and B3 may be generated according to parameters such as a physical cell ID and a system frame number received by a user equipment, then channel estimation is performed on all cells according to baseband data and the pilot sequence, and an interference signal of a neighboring cell is reconstructed according to the channel estimation. Specifically, a first target cell with the strongest signal may be determined in the serving cell a and the three interfering neighboring cells B1, B2, and B3, and then the signal of the first target cell may be subtracted from the signal received by the user equipment to obtain a first result. And then, determining a second target cell with the strongest signal in the rest cells, subtracting the signal of the second target cell from the first result, and so on until the signal of each cell is subjected to subtraction calculation, wherein the final subtraction result is the same-frequency interference. After the co-channel interference is obtained, the co-channel interference is subtracted from the baseband data to obtain a signal of a serving cell, and the processing such as channel estimation, demodulation and decoding is carried out.
It can be seen that, according to the related art, the ue needs to perform an iterative subtraction process between pilot sequences of the serving cell and the interfering neighbor cell to obtain the co-channel interference, which increases the computational complexity and power loss of the ue and cannot better meet the low power requirement of the NB-IoT ue.
In view of this, the embodiments of the present disclosure provide a method, an apparatus, a storage medium, and a user equipment for determining co-channel interference, so as to reduce the computational complexity of the user equipment in the co-channel interference determination process, reduce the power loss of the user equipment, and better meet the low power requirement of the NB-IoT user equipment.
Fig. 2 is a flowchart illustrating a method for determining co-channel interference according to an exemplary embodiment of the disclosure, which may be applied to a user equipment in a narrowband internet of things NB-IoT. Among them, NB-IoT is an emerging technology in the field of internet of things, supports cellular data connection of low power consumption devices in a wide area network, and is also called a low power consumption wide area network (LPWAN). Referring to fig. 2, the method may include:
step S201, obtaining configuration information of a narrowband reference signal NRS sequence of a serving cell. Wherein the configuration information may include at least one subframe having zero power per repetition period in an NRS sequence of the serving cell
Step S202, determining the NRS sequence of the interference neighbor cell.
Step S203, determining target subframes with the same subframe numbers as at least one subframe in the NRS sequence of the interfering neighbor cell.
And step S204, calculating the co-frequency interference of the interference adjacent cell at the target subframe.
Through the mode, the power of at least one subframe is zero in each repetition period in the NRS sequence of the service cell, so after the NRS sequence of the interference neighbor cell is determined, the user equipment can directly calculate the same frequency interference at the subframe with the zero power according to the received signal without performing iterative subtraction between the pilot frequency sequences of the service cell and the interference neighbor cell to obtain the same frequency interference, thereby reducing the calculation complexity of the user equipment in the process of determining the same frequency interference, reducing the power loss of the user equipment and better meeting the low power requirement of NB-IoT user equipment.
In a possible mode, after the co-channel interference of the interference neighboring cell is calculated, a target signal subframe with a subframe number different from that of at least one subframe can be determined in a signal sequence received by the user equipment, and then the co-channel interference is subtracted from the target signal subframe according to the signal sequence received by the user equipment to obtain a signal sequence sent to the user equipment by the serving cell.
That is to say, in the embodiment of the present disclosure, a part of the sub-frame power in the NRS sequence of the serving cell is zero, which is used to directly calculate the co-channel interference, and another part of the sub-frame power is not zero, which is used to send a signal, so that after the co-channel interference is calculated, the co-channel interference can be directly subtracted from the sub-frame whose power is not zero, so as to obtain a signal sequence that is sent by the serving cell to the user equipment, and the co-channel interference in the signal sequence received by the user equipment is eliminated.
For example, the first repetition period in the NRS sequence of the serving cell includes subframes 0 to 9, subframes with power of zero are subframe 0 and subframe 1 in the repetition period, and subframes with power not zero are subframes 2 to 9 in the repetition period. After calculating the co-channel interference, the co-channel interference can be subtracted from the subframes 2 to 9 of the signal sequence received by the user equipment to obtain the signal sequence sent by the serving cell to the user equipment, and the co-channel interference in the signal sequence received by the user equipment is eliminated.
In order to make the method for determining co-channel interference in the present disclosure more understandable to those skilled in the art, the above steps are exemplified in detail below.
In step S201, the user equipment may acquire configuration information of a narrowband reference signal NRS sequence of the serving cell by parsing the received system information block SIB. The configuration information may include at least one subframe with zero power in each repetition period in the NRS sequence of the serving cell, that is, the configuration information may include information indicating at least one subframe with zero power in each repetition period in the NRS sequence of the serving cell. In a possible approach, the information may be a subframe number of at least one subframe with a power of zero.
For example, if each repetition period in the NRS sequence of the serving cell includes 10 subframes, the power of at least one subframe in each 10 subframes in the NRS sequence of the serving cell may be set to zero. Specifically, the power of the 1 st subframe and the power of the 2 nd subframe in each 10 subframes in the NRS sequence of the serving cell may be set to be zero based on an actual application scenario, and the disclosure is not limited thereto.
In a possible manner, the configuration information may further include a repetition period of an NRS sequence of the serving cell and a starting subframe of the zero-power narrowband reference signal in each repetition period. Correspondingly, the step of determining the NRS sequence of the interfering neighbor may be determining the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor according to the timing offset and the repetition period and starting subframe included in the configuration information, and then determining the NRS sequence of the interfering neighbor according to the starting subframe and physical cell ID of the interfering neighbor.
For example, referring to fig. 3, the NRS sequence of the serving cell may include a plurality of repetition periods zpNrsPeriod, each of which includes the same number of subframes. For example, the NRS sequence includes 0 to 63 subframes, and each repetition period is configured to include 16 subframes, in which case, the first repetition period may include subframes 0 to 15, the second repetition period may include subframes 16 to 31, and so on.
In a possible manner, since the user equipment may acquire the timing within 80ms when searching for the narrowband secondary synchronization signal NSSS in the network searching process, the repetition period of the NRS sequence of the serving cell may be set to any value within 80ms, which is not limited in this embodiment of the disclosure. It should be understood that, in order not to increase power consumption of the user equipment, the repetition period of the NRS sequence of the serving cell may be set to any one of 10, 20, 50, and 80ms.
With continued reference to fig. 3, each repetition period may include a corresponding starting subframe zpNrsOffset, i.e., the starting subframe of the narrowband reference signal with zero power in each repetition period. For example, in the above example, if the starting subframe in each repetition period is set as the first subframe, the starting subframe of the narrowband reference signal with zero power in the first repetition period is subframe 0, the starting subframe of the narrowband reference signal with zero power in the second repetition period is subframe 16, and so on.
For example, since the NB-IoT only has a reselection phase in the network searching process, the user equipment may acquire the physical cell ID of the interfering neighbor cell and the timing offset of the interfering neighbor cell with respect to the serving cell in the reselection phase. Wherein the range of the acquired physical cell ID is 0 to 503. In addition, since the user equipment can acquire timing within 80ms when searching for the narrowband secondary synchronization signal NSSS, the range of timing deviation of the interfering neighbor cell with respect to the serving cell may be 0 to 80ms.
After determining the repetition period of the NRS sequence of the serving cell, the starting subframe of the zero-power narrowband reference signal in each repetition period, and the timing offset of the interfering neighbor with respect to the serving cell, the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor may be determined according to the timing offset, the repetition period, and the starting subframe. For example, the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor may be determined according to the following formula:
wherein n is f Indicating the radio frame number, n, of the NRS sequence used to transmit the interfering neighbor s The method comprises the steps that the initial subframe number of a narrowband reference signal in each repetition period of an NRS sequence of an interference adjacent cell in a wireless frame is represented, delta represents the timing deviation of the interference adjacent cell relative to a service cell, zpNrsPeriod represents the repetition period of the NRS sequence of the service cell, and zpNrsOffset represents the initial subframe of a zero-power narrowband reference signal in each repetition period of the NRS sequence of the service cell.
In a possible manner, in order not to affect the network search of the ue, after determining the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor according to the above-mentioned manner, it may be further determined whether the starting subframe is a subframe used for transmitting any one of the narrowband primary synchronization signal NPSS, the narrowband secondary synchronization signal NSSS, and the system information block SIB. If the starting subframe is a subframe for transmitting any one of the narrowband primary synchronization signal NPSS, the narrowband secondary synchronization signal NSSS, and the system information block SIB, the next subframe of the starting subframe may be used as the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor cell.
For example, in NB-IoT, NPSS is fixed at subframe 5 of each radio frame for transmission, and NSSS is fixed at subframe 9 of each even radio frame, after determining the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interference neighbor, it may be determined whether the subframe number of the starting subframe is 5 or 9, and then determine whether the starting subframe is a subframe for transmitting NPSS or NSSS. Similarly, determining whether the starting subframe is a subframe for transmitting the SIB may also be determining a subframe number for transmitting the SIB, and then determining whether the starting subframe number of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor is the same as the subframe number for transmitting the SIB, which is not described herein again.
In this disclosure, in order not to affect the network searching of the ue, if the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor is determined to be a subframe used for sending any one of NPSS, NSSS, and SIB, the next subframe of the starting subframe may be used as the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor, so as to ensure that the network searching process of the ue is performed normally. For example, in the above example, if the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor is subframe 5, that is, the starting subframe is a subframe for transmitting NPSS, then the subframe next to the starting subframe, that is, subframe 6, may be used as the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor.
According to the 3Gpp 36.211 protocol, the NRS sequence is generated only in relation to the physical cell ID and the starting subframe number, so that after the physical cell ID of the interfering neighbor and the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor are obtained in the above manner, the user equipment can determine the NRS sequence of the interfering cell.
Exemplarily, the power of at least one subframe in the NRS sequence of the serving cell is 0, which may indicate that the serving cell does not send a signal to the user equipment in the at least one subframe, and therefore only a signal of an interfering neighbor cell is in the at least one subframe, and then a corresponding subframe of the at least one subframe may be determined in the NRS sequence of the interfering neighbor cell, and then the co-channel interference of the interfering neighbor cell may be obtained by calculating the corresponding subframe. Specifically, the NRS sequence of the interfering neighbor cell may be compared with a local sequence generated by the user equipment and directed to the interfering neighbor cell, so as to recover a complete signal of the interfering neighbor cell, and further calculate the co-frequency interference of the interfering neighbor cell, where a specific calculation process is similar to that in the related art, and is not described herein again.
Through the mode, the power of at least one subframe is zero in each repetition period in the NRS sequence of the service cell, so after the NRS sequence of the interference neighbor cell is determined, the user equipment can directly calculate the same frequency interference at the subframe with the zero power according to the received signal without performing iterative subtraction between the pilot frequency sequences of the service cell and the interference neighbor cell to obtain the same frequency interference, thereby reducing the calculation complexity of the user equipment in the process of determining the same frequency interference, reducing the power loss of the user equipment and better meeting the low power requirement of NB-IoT user equipment.
Based on the same inventive concept, referring to fig. 4, an apparatus 400 for determining co-channel interference is further provided in the embodiments of the present disclosure, and is applied to a user equipment in a narrowband internet of things NB-IoT, and may become part or all of the user equipment through software, hardware, or a combination of the two, where the apparatus 400 may include:
a first obtaining module 401, configured to obtain configuration information of a narrowband reference signal NRS sequence of a serving cell, where the configuration information includes at least one subframe with zero power in each repetition period in the NRS sequence;
a first determining module 402, configured to determine an NRS sequence of an interfering neighbor;
a second determining module 403, configured to determine, in the NRS sequence of the interfering neighbor cell, target subframes that are respectively the same as subframe numbers of the at least one subframe;
a calculating module 404, configured to calculate co-channel interference of the interference neighboring cell at the target subframe.
Optionally, the apparatus 400 further comprises:
a third determining module, configured to determine, in the signal sequence received by the ue, a target signal subframe different from a subframe number of the at least one subframe;
and the processing module is used for subtracting the same frequency interference from the target signal subframe aiming at the signal sequence received by the user equipment to obtain the signal sequence sent to the user equipment by the serving cell.
Optionally, the configuration information further includes a repetition period of an NRS sequence of the serving cell and a starting subframe number of a zero-power narrowband reference signal in each repetition period, and the apparatus 400 further includes:
a second obtaining module, configured to obtain a physical cell ID of the interfering neighbor cell and a timing offset of the interfering neighbor cell with respect to the serving cell;
the first determination module is to:
determining a starting subframe of a narrow-band reference signal in each repetition period in an NRS sequence of the interference neighbor cell according to the timing deviation and the repetition period and the starting subframe included in the configuration information;
and determining the NRS sequence of the interference neighbor cell according to the initial subframe of the interference neighbor cell and the physical cell ID.
Optionally, the apparatus 400 further comprises:
a determining module, configured to determine, after determining a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interfering neighbor according to the timing offset, the repetition period, and the starting subframe, whether the starting subframe is a subframe used for sending any one of a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS, and a system information block SIB;
a subframe determining module, configured to, when the starting subframe is a subframe used for sending any one of a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS, and a system information block SIB, take a next subframe of the starting subframe as a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interference neighbor cell.
With regard to the apparatus in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be described in detail here.
By any one of the above-mentioned apparatuses for determining co-channel interference, the power of at least one subframe is zero in each repetition period in the NRS sequence of the serving cell, and therefore, after the NRS sequence of the interfering neighbor cell is determined, the user equipment can directly calculate the co-channel interference at the subframe whose power is zero according to the received signal, and iterative subtraction between the pilot sequences of the serving cell and the interfering neighbor cell is not required to obtain the co-channel interference, thereby reducing the calculation complexity of the user equipment in the process of determining the co-channel interference, reducing the power loss of the user equipment, and better satisfying the low-power requirement of the NB-IoT user equipment.
Based on the same inventive concept, the present disclosure also provides a user equipment, applied to a narrowband internet of things, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any one of the first aspects.
Through the user equipment, the power of at least one subframe in each repetition period in the received NRS sequence of the service cell is zero, so after the NRS sequence of the interference neighbor cell is determined, the user equipment can directly calculate the same frequency interference at the subframe with the zero power according to the received signal without performing iterative subtraction between the pilot frequency sequences of the service cell and the interference neighbor cell to obtain the same frequency interference, thereby reducing the calculation complexity of the user equipment in the process of determining the same frequency interference, reducing the power loss of the user equipment and better meeting the low power requirement of NB-IoT user equipment.
In a possible approach, a block diagram of the user equipment is shown in fig. 5. Referring to fig. 5, the user equipment 500 may include: a processor 501 and a memory 502. The user device 500 may also include one or more of a multimedia component 503, an input/output (I/O) interface 504, and a communications component 505.
The processor 501 is configured to control the overall operation of the ue 500, so as to complete all or part of the steps in the method for determining co-channel interference. The memory 502 is used to store various types of data to support operations at the user equipment 500, such as instructions for any application or method operating on the user equipment 500, and application-related data, such as configuration information for a narrowband reference signal, NRS, sequence of a serving cell, and so forth. The Memory 502 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically Erasable Programmable Read-Only Memory (EEPROM), erasable Programmable Read-Only Memory (EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk.
The multimedia component 503 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 502 or transmitted through the communication component 505. The audio assembly also includes at least one speaker for outputting audio signals.
The I/O interface 504 provides an interface between the processor 501 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 505 is used for wired or wireless communication between the user equipment 500 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination thereof, which is not limited herein. The corresponding communication component 505 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the user equipment 500 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described method for determining co-channel interference.
In another exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the method of determining co-channel interference described above is also provided. For example, the computer readable storage medium may be the memory 502 described above that includes program instructions executable by the processor 501 of the user equipment 500 to perform the method for determining co-channel interference described above.
In another exemplary embodiment, a computer program product is also provided, which contains a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-described method of determining co-channel interference when executed by the programmable apparatus.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (8)
1. A method for determining co-channel interference, applied to a User Equipment (UE) in a narrowband Internet of things (NB-IoT), the method comprising:
acquiring configuration information of a Narrowband Reference Signal (NRS) sequence of a serving cell, wherein the configuration information comprises at least one subframe with zero power in each repetition period in the NRS sequence, the repetition period of the NRS sequence of the serving cell and a starting subframe of a zero-power narrowband reference signal in each repetition period;
acquiring a physical cell ID of an interference neighbor cell and a timing deviation of the interference neighbor cell relative to the serving cell;
determining a starting subframe of a narrow-band reference signal in each repetition period in an NRS sequence of the interference neighbor cell according to the timing deviation and the repetition period and the starting subframe included in the configuration information;
determining an NRS sequence of the interference neighbor cell according to the initial subframe of the interference neighbor cell and the physical cell ID;
determining target subframes which are respectively the same as the subframe numbers of the at least one subframe in the NRS sequence of the interference neighbor cell;
and calculating the co-channel interference of the interference adjacent cell at the target subframe.
2. The method of claim 1, further comprising:
determining a target signal subframe different from a subframe number of the at least one subframe in a signal sequence received by the user equipment;
and subtracting the same frequency interference from the target signal subframe aiming at the signal sequence received by the user equipment to obtain the signal sequence sent to the user equipment by the serving cell.
3. The method of claim 1 or 2, wherein after determining a starting subframe of a narrowband reference signal in each repetition period in the NRS sequence of the interfering neighbor according to the timing offset, and the repetition period and the starting subframe, the method further comprises:
judging whether the starting subframe is a subframe for sending any one of a Narrowband Primary Synchronization Signal (NPSS), a Narrowband Secondary Synchronization Signal (NSSS) and a System Information Block (SIB);
and if the starting subframe is a subframe used for sending any one of a Narrowband Primary Synchronization Signal (NPSS), a Narrowband Secondary Synchronization Signal (NSSS) and a System Information Block (SIB), taking the next subframe of the starting subframe as the starting subframe of the narrowband reference signal in each repetition period in the NRS sequence of the interference neighbor cell.
4. An apparatus for determining co-channel interference, the apparatus being applied to a User Equipment (UE) in a narrowband Internet of things (NB-IoT), the apparatus comprising:
a first obtaining module, configured to obtain configuration information of an NRS sequence of a narrowband reference signal of a serving cell, where the configuration information includes at least one subframe in which power is zero in each repetition period in the NRS sequence, a repetition period of the NRS sequence of the serving cell, and a starting subframe of a zero-power narrowband reference signal in each repetition period;
a second obtaining module, configured to obtain a physical cell ID of an interfering neighbor cell and a timing offset of the interfering neighbor cell with respect to the serving cell;
a first determining module, configured to determine, according to the timing offset and a repetition period and a starting subframe included in the configuration information, a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interfering neighbor cell; determining an NRS sequence of the interference neighbor cell according to the initial subframe of the interference neighbor cell and the physical cell ID;
a second determining module, configured to determine, in an NRS sequence of the interfering neighbor cell, target subframes having the same subframe numbers as the subframe numbers of the at least one subframe, respectively;
and the calculation module is used for calculating the co-channel interference of the interference adjacent cell at the target subframe.
5. The apparatus of claim 4, further comprising:
a third determining module, configured to determine, in the signal sequence received by the ue, a target signal subframe different from a subframe number of the at least one subframe;
and the processing module is used for subtracting the same frequency interference from the target signal subframe aiming at the signal sequence received by the user equipment to obtain the signal sequence sent to the user equipment by the serving cell.
6. The apparatus of claim 4 or 5, further comprising:
a determining module, configured to determine, after determining an initial subframe of a zero-power narrowband reference signal in each repetition period in an NRS sequence of the interfering neighbor according to the timing offset, the repetition period, and the initial subframe, whether the initial subframe is a subframe used for transmitting any one of a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS, and a system information block SIB;
a subframe determining module, configured to, when the starting subframe is a subframe used for sending any one of a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS, and a system information block SIB, take a next subframe of the starting subframe as a starting subframe of a narrowband reference signal in each repetition period in an NRS sequence of the interfering neighbor cell.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
8. The utility model provides a user equipment which characterized in that, is applied to narrowband thing networking, includes:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 3.
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