CN108183781B - Method for sharing spectrum between NB-IoT system and other broadband communication systems - Google Patents

Method for sharing spectrum between NB-IoT system and other broadband communication systems Download PDF

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Publication number
CN108183781B
CN108183781B CN201711212534.0A CN201711212534A CN108183781B CN 108183781 B CN108183781 B CN 108183781B CN 201711212534 A CN201711212534 A CN 201711212534A CN 108183781 B CN108183781 B CN 108183781B
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CN
China
Prior art keywords
iot
broadband communication
downlink
signal
uplink
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CN201711212534.0A
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Chinese (zh)
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CN108183781A (en
Inventor
焦秉立
马猛
张丽媛
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北京大学
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks

Abstract

The invention discloses a method for sharing a frequency spectrum between an NB-IoT system and other broadband communication systems, and belongs to the field of wireless communication and Internet of things. The method keeps the working mode of the broadband communication system unchanged, one or more uplink channels are distributed for the NB-IoT transmitter on the downlink channel of the broadband communication system, the base station firstly eliminates the downlink signal interference of the broadband communication system contained in the received NB-IoT uplink signal, and then carries out the traditional NB-IoT uplink signal demodulation; similarly, one or more downlink channels are allocated to the NB-IoT transmitter on the uplink channel of the broadband communication system, and the base station first cancels the NB-IoT downlink signal interference contained in the received uplink signal of the broadband communication system, and then performs traditional broadband communication system uplink signal demodulation. According to the invention, the NB-IoT does not need to be allocated with independent spectrum resources, so that the overhead of the spectrum resources is saved.

Description

Method for sharing spectrum between NB-IoT system and other broadband communication systems

Technical Field

The invention belongs to the field of wireless communication and Internet of things, and particularly relates to an NB-IoT and broadband wireless communication system, an interference elimination technology and the like.

Background

The cellular-based narrowband Internet of Things (NB-IoT) is an important branch of the Internet of everything. The NB-IoT is constructed in a cellular network, only consumes about 180KHz of bandwidth, and can be directly deployed in a GSM network, a UMTS network or an LTE network so as to reduce the deployment cost and realize smooth upgrading. The NB-IoT supports cellular data connectivity for low power devices over a wide area network, also known as a Low Power Wide Area Network (LPWAN).

Deployment of NB-IoT in a wireless communication network requires a large amount of spectrum resources. However, with the rapid development of wireless applications, the spectrum resources are increasingly strained and crowded, and the world faces a severe problem of spectrum resource shortage.

Disclosure of Invention

The invention aims to provide a method for sharing spectrum by an NB-IoT system and other broadband communication systems.

The technical scheme provided by the invention is as follows:

a method for sharing frequency spectrum between NB-IoT system and other broadband communication system is characterized in that the working mode of the broadband communication system is kept unchanged, one or more uplink channels are allocated to an NB-IoT transmitter on the downlink channel of the broadband communication system, the base station firstly eliminates the downlink signal interference of the broadband communication system contained in the received NB-IoT uplink signal, and then carries out traditional NB-IoT uplink signal demodulation; similarly, one or more downlink channels are allocated to the NB-IoT transmitter on the uplink channel of the broadband communication system, and the base station first eliminates the NB-IoT downlink signal interference contained in the received uplink signal of the broadband communication system, and then performs traditional broadband communication system uplink signal demodulation;

the process of interference elimination of the received NB-IoT uplink signal comprises the steps of shunting a downlink signal generated by a broadband communication system transmitter, transmitting one path of signal through an antenna, filtering and separating the other path of signal to obtain a signal component which is overlapped with an NB-IoT uplink channel frequency spectrum, and inputting the signal and a received signal into an interference eliminator for interference elimination;

the process of carrying out interference elimination on the received uplink signal of the broadband communication system comprises the steps of shunting the downlink signal generated by the NB-IoT transmitter, transmitting one path of signal through an antenna, and inputting the other path of signal and a received signal into an interference eliminator to carry out interference elimination;

the working mode of the interference eliminator is that channel parameters of downlink self-interference generated by signal leakage caused by non-ideal devices when downlink signals pass through a circulator are estimated firstly. And adjusting parameters of the FIR filter according to the channel parameters, and reconstructing a downlink self-interference signal. Finally, adding the reconstructed downlink self-interference signal and the received signal, eliminating the downlink self-interference signal in the received signal, and extracting the uplink signal;

the antenna is a receiving and transmitting integrated antenna and is connected with a transmitting signal and a receiving signal through a circulator;

the NB-IoT uplink signal interference cancellation process is that, if there are multiple NB-IoT uplink channels, a band-pass filter and an interference canceller may be used to perform interference cancellation on each uplink channel;

the allocation of the uplink and downlink channels to the NB-IoT system can be realized by a control unit, and the control unit selects the channel allocated to the NB-IoT system according to the NB-IoT requirement and the channel condition of the broadband communication system and sends the instruction to the NB-IoT transmitter and the receiver;

the wideband communication system can be a time division duplex wideband communication system or a frequency division duplex wideband communication system. For a time division duplex system, downlink or uplink channels of NB-IoT are respectively allocated on uplink or downlink time slots of a broadband communication system; for a frequency division duplex system, downlink or uplink channels of NB-IoT are respectively allocated on uplink or downlink frequency bands of a broadband communication system;

the invention has the beneficial effects that:

the method can realize the coexistence of the existing broadband communication system, such as a cellular communication system or a WiFi communication system and an NB-IoT system, thereby not allocating independent spectrum resources for the NB-IoT and saving the expenditure of the spectrum resources.

Drawings

FIG. 1 is a diagram of spectrum resources of an NB-IoT system and a broadband communication system

FIG. 2 is a schematic diagram of a NB-IoT system sharing spectrum with a downlink channel of a broadband communication system

FIG. 3 is a schematic diagram of an NB-IoT system sharing spectrum with an upstream channel of a broadband communication system

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

By utilizing the method for sharing the frequency spectrum by the NB-IoT system and other broadband communication systems, the working mode of the broadband communication system is kept unchanged, one or more uplink channels are allocated to the NB-IoT transmitter on the downlink channel of the broadband communication system, and the base station firstly eliminates the downlink signal interference of the broadband communication system contained in the received NB-IoT uplink signal and then carries out the traditional NB-IoT uplink signal demodulation; one or more downlink channels are allocated to the NB-IoT transmitter on an uplink channel of the broadband communication system, and the base station terminal firstly eliminates the interference of the NB-IoT system downlink signals contained in the received uplink signals of the broadband communication system and then demodulates the uplink signals of the traditional broadband communication system. The invention can be applied to a time division duplex broadband communication system and a frequency division duplex broadband communication system, and controls the NB-IoT system and the broadband communication system to go up and down through the control unit.

In this embodiment, the wideband communication system adopts a time division duplex multiplexing strategy, and its working bandwidth is W. The bandwidth of a single NB-IoT channel is 200KHz, sharing spectrum with the broadband communication system, as shown in fig. 1. In this embodiment, requests for multiple NB-IoT uplink or downlink signals may be processed simultaneously.

As shown in fig. 2, when the broadband communication system transmits a downstream signal, the downstream signal generated by the transmitter of the broadband communication system is input to the splitter for splitting. One path of signal in the output signals of the branching unit is input into an input port of the circulator and is transmitted through an antenna connected to an output port of the circulator; and the other path of signal is accessed into a band-pass filter, and a signal component of a part which is overlapped with the NB-IoT uplink channel frequency spectrum is separated out and is input into an interference eliminator as a reference signal. The received signal of the antenna is output to the interference canceller by the circulator isolation port. The interference eliminator firstly estimates the parameters of the downlink self-interference channel, then adjusts the parameters of the FIR filter according to the channel parameters, and reconstructs the downlink self-interference signal. And finally, adding the reconstructed downlink self-interference signal and the received signal, eliminating the downlink self-interference signal in the received signal, extracting the NB-IoT uplink signal, and inputting the NB-IoT uplink signal to an NB-IoT receiver for traditional uplink signal demodulation. For N NB-IoT uplink channels, interference on each channel can be eliminated through N parallel band-pass filters and interference cancellers, and then the interference is input to an NB-IoT receiver for signal demodulation.

As shown in fig. 3, in the time slice of transmitting the uplink signal in the broadband communication system, the downlink signal generated by the NB-IoT transmitter is input to the splitter for splitting. One path of signal in the output signals of the branching unit is input into an input port of the circulator and is transmitted through an antenna connected to an output port of the circulator; the other path of signal is used as a reference signal to be input into the interference eliminator. The received signal of the antenna is output to the interference eliminator through the circulator isolation port. The interference eliminator firstly estimates the parameters of the downlink self-interference channel, then adjusts the parameters of the FIR filter according to the channel parameters, and reconstructs the downlink self-interference signal. And finally, adding the reconstructed downlink self-interference signal and the received signal, eliminating the downlink self-interference signal in the received signal, extracting the MS uplink signal, and inputting the MS uplink signal to a broadband communication system receiver for traditional uplink signal demodulation.

Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.

Claims (5)

1. A method for sharing frequency spectrum between NB-IoT system and other broadband communication system is characterized in that the working mode of the broadband communication system is kept unchanged, one or more uplink channels are allocated to an NB-IoT transmitter on the downlink channel of the broadband communication system, the base station firstly eliminates the downlink signal interference of the broadband communication system contained in the received NB-IoT uplink signal, and then carries out traditional NB-IoT uplink signal demodulation; one or more downlink channels are distributed for an NB-IoT transmitter on an uplink channel of a broadband communication system, a base station terminal firstly eliminates the interference of NB-IoT system downlink signals contained in the received uplink signals of the broadband communication system, then demodulates the uplink signals of the traditional broadband communication system, when the broadband communication system transmits the downlink signals, the downlink signals generated by the broadband communication system transmitter are input into a branching unit for branching, and one path of signals in output signals of the branching unit are input into an input port of a circulator and transmitted through an antenna connected to an output port of the circulator; and the other path of signal is accessed into a band-pass filter, a signal component of a part overlapping with the frequency spectrum of the NB-IoT uplink channel is separated out and is input into an interference eliminator as a reference signal, a receiving signal of an antenna is output to the interference eliminator through a circulator isolation port, the interference eliminator firstly estimates parameters of a downlink self-interference channel, then adjusts parameters of an FIR filter according to the channel parameters, reconstructs a downlink self-interference signal, finally adds the reconstructed downlink self-interference signal and the receiving signal, eliminates the downlink self-interference signal in the receiving signal, extracts the NB-IoT uplink signal and inputs the NB-IoT uplink signal into an NB-IoT receiver to perform traditional uplink signal demodulation.
2. The NB-IoT system that shares spectrum with other broadband communication systems as in claim 1, wherein if there are multiple NB-IoT upstream channels, interference cancellation is performed with a bandpass filter and an interference canceller, respectively, for each upstream channel.
3. The method of claim 1, in which the NB-IoT system shares spectrum with other broadband communication systems, wherein the broadband communication system is a time division duplex broadband communication system or a frequency division duplex broadband communication system.
4. The method of claim 3, wherein for a time division duplex broadband communication system, downlink or uplink channels of NB-IoT are allocated on uplink or downlink timeslots, respectively, of the broadband communication system.
5. The method of claim 3, wherein for a frequency division duplex broadband communication system, downlink or uplink channels of NB-IoT are allocated on uplink or downlink frequency bands of the broadband communication system, respectively.
CN201711212534.0A 2017-11-28 2017-11-28 Method for sharing spectrum between NB-IoT system and other broadband communication systems CN108183781B (en)

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CN108183781B true CN108183781B (en) 2020-10-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102656912A (en) * 2009-12-16 2012-09-05 卡西迪安有限公司 Method of management for operating a broad band communication system and a narrow band communication system implemented in a same frequency band
CN103188809A (en) * 2011-12-30 2013-07-03 北京大学 Free duplex communication system and channel allocation method thereof
CN103200140A (en) * 2012-01-06 2013-07-10 北京大学 Interference elimination system and method based on pre-equalization

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103716266B (en) * 2012-09-29 2017-09-12 华为技术有限公司 Signal processing method, apparatus and system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102656912A (en) * 2009-12-16 2012-09-05 卡西迪安有限公司 Method of management for operating a broad band communication system and a narrow band communication system implemented in a same frequency band
CN103188809A (en) * 2011-12-30 2013-07-03 北京大学 Free duplex communication system and channel allocation method thereof
CN103200140A (en) * 2012-01-06 2013-07-10 北京大学 Interference elimination system and method based on pre-equalization

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