CN111988071A - LTE and NR user space division multiplexing method - Google Patents

LTE and NR user space division multiplexing method Download PDF

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CN111988071A
CN111988071A CN201910443733.5A CN201910443733A CN111988071A CN 111988071 A CN111988071 A CN 111988071A CN 201910443733 A CN201910443733 A CN 201910443733A CN 111988071 A CN111988071 A CN 111988071A
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lte
base station
uplink data
user
users
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唐清
艾星星
黄�俊
邱刚
张诗壮
陈冬雷
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0862—Weighted combining receiver computing weights based on information from the transmitter

Abstract

The invention provides a space division multiplexing method for LTE (Long term evolution) and NR (noise-and-noise) users, which comprises the steps that a base station carries out space filtering receiving on received LTE and NR user uplink data, the space filtering receiving is used for separating the LTE uplink data and the NR uplink data, and the base station carries out demodulation processing on the separated LTE and NR uplink data respectively. Compared with the prior art, the technical scheme of the invention provides a space division multiplexing method for LTE and NR users, which reduces mutual interference between the LTE system and the NR system, enables the LTE system and the NR system to multiplex the same time-frequency resource and improves the frequency resource utilization rate of a communication system.

Description

LTE and NR user space division multiplexing method
Technical Field
The present application relates to the field of wireless communications, and in particular, to a space division multiplexing method for LTE and NR users.
Background
With the freezing of the 3GPP release 5G standard, a fifth generation communication technology (New Radio, NR) is about to be used commercially, but at the initial stage of NR deployment, a large number of 4G users still exist in the current network, and NR cannot avoid networking with a fourth generation communication system (Long Term Evolution, LTE).
At present, an LTE system and an NR system are generally deployed in different frequency bands, and because working frequency points are different, interference between the systems is small, and the two systems can coexist in different frequencies. However, in order to increase the bandwidth of NR or improve the usage efficiency of LTE spectrum, the LTE system and the NR system may be integrated into a network, i.e. an overlapping scenario of operating spectrum. For example, the LTE system exists as a special Bandwidth (BWP) in the NR system, and the two systems interfere with each other, thereby reducing the performance of the communication system. Therefore, a space division multiplexing method for users in the LTE system and users in the NR system is needed to reduce mutual interference between the two systems and improve performance of the communication system.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for space division multiplexing of LTE and NR users, which is used to improve the performance of a communication system.
In order to achieve the purpose of the invention, the invention provides a method for space division multiplexing of LTE (Long term evolution) and NR (noise-and-noise) users, which comprises the following steps:
the base station carries out spatial filtering receiving on the received uplink data of the LTE user and the NR user; the spatial filtering reception is used for separating LTE uplink data and NR uplink data;
and the base station respectively demodulates the LTE uplink data and the NR uplink data obtained by separation.
Further, the base station performs spatial filtering reception on the received LTE and NR user uplink data, where the spatial filtering reception is used to separate the LTE uplink data from the NR uplink data and includes: and the base station constructs a corresponding space receiving weight according to the received uplink data of the LTE and NR users, and performs spatial filtering receiving on the received LTE and NR uplink data according to the space receiving weight.
Further, the base station constructs a corresponding spatial receiving weight by using the channel estimation of the base station in the uplink data.
Further, the base station constructs a corresponding spatial receiving weight by using channel information reported by users in uplink data.
Further, the base station constructs a corresponding spatial receiving weight value by using the beam information of the reference signal in the uplink data.
The invention also provides a method for space division multiplexing of LTE and NR users, which comprises the following steps:
the base station carries out combined precoding weighting on the downlink data of the LTE user and the NR user to be sent, wherein the combined precoding weighting is used for separating the downlink data of the LTE user and the NR user;
and the base station respectively transmits the separated LTE user downlink data and NR user downlink data to the LTE user and the NR user.
Further, the base station performs joint precoding weighting on downlink data of the LTE and NR users to be transmitted, where the joint precoding weighting is used to separate the downlink data of the LTE and NR users and includes: and the base station constructs corresponding space sending weight values according to the received uplink data of the LTE and NR users, and performs combined precoding weighting on the downlink data of the LTE and NR users to be sent according to the space sending weight values.
Further, the base station constructs a corresponding space transmission weight by using the channel estimation of the base station in the uplink data.
Further, the base station constructs a corresponding space transmission weight by using channel information reported by users in uplink data.
Further, the base station constructs a corresponding spatial transmission weight value by using the beam information of the reference signal in the uplink data.
The present invention also provides a base station, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing any of the steps of the space division multiplexing method described above when executing the program.
Compared with the prior art, the technical scheme of the invention provides a space division multiplexing method for LTE and NR users, which reduces mutual interference between the LTE system and the NR system, enables the LTE system and the NR system to multiplex the same time-frequency resource and improves the frequency resource utilization rate of a communication system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
Fig. 1 is a flowchart of an embodiment of a space division multiplexing method for LTE and NR users according to the present invention.
Fig. 2 is a flowchart of another LTE and NR user space division multiplexing method according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an embodiment of a base station provided in the present invention.
Fig. 4 is a schematic diagram of spatial filtering reception or joint precoding performed by the base station provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 1, an embodiment of the present invention provides a spatial division multiplexing method for LTE and NR networks, including:
step S101: for users (simultaneously co-frequency scheduling) separated by space by LTE and NR, a base station combines the information of the space characteristics, the interference direction and the like of the users and utilizes a beam forming method such as zero forcing and the like to construct a corresponding space receiving weight value so as to separate out signals of each UE in respective systems.
It is assumed that the spatial signature or interference direction of the M LTE users can be expressed as
Figure BDA0002072335980000031
Wherein
Figure BDA0002072335980000032
The spatial characteristics or interference directions of the ith LTE user can be expressed as
Figure BDA0002072335980000033
Wherein
Figure BDA0002072335980000034
Representing the spatial signature or interference direction of the jth NR user.
Using zero-forcing beamforming algorithm, the spatial receive weight WuplinkCan be expressed as:
Wuplink＝[HHH]-1HH
wherein
Figure BDA0002072335980000035
Representing a combination of spatial signatures or interference directions for LTE and NR users.
And performing space-domain filtering on the received signal by using the space-to-space receiving weight, wherein the obtained space-domain filtered signal is as follows:
Yspatial_filter＝WuplinkY
wherein Y is a base station received signal, Yspatial_filterIs the signal of each UE in the respective system separated after spatial filtering.
Preferably, the base station uses historical channel estimation information of the base station, for example, channel estimation based on reference signals such as srs (sounding reference signal), dmrs (demodulation reference signal), etc., to obtain spatial characteristics of the spatial users, and uses a beamforming method such as zero forcing to construct corresponding spatial receiving weights for uplink receiving, so as to separate signals of different users.
For example, the base station utilizes the channel information or spatial characteristics of LTE and NR users estimated based on the reference signals such as SRS and DMRS, and then adopts the zero-forcing beamforming method described in step S101 to construct corresponding spatial receiving weights, and separate out the signals of each UE in the respective systems
Preferably, the base station uses Channel information reported by the user, for example, Channel estimation based on reference signals such as DMRS, CSIRS (Channel-state information reference signal), CRS (Cell-specific reference signal), etc. reported by the user to obtain spatial characteristics of the space division user, and uses beamforming methods such as zero forcing to construct corresponding spatial receiving weights for uplink receiving, so as to separate signals of different users.
For example, the LTE user estimates the current channel state using DMRS, CSIRS, CRS reference signals, the NR user estimates the current channel state using DMRS, CSIRS, and other reference signals, and reports the current channel state to the base station, and the base station constructs a corresponding spatial receiving weight by using the zero forcing and other beamforming methods described in step S101, and separates out the signal of each UE in each system.
Preferably, the base station uses the beam information of the reference Signal, such as based on the beam information carried by ssb (synchronization Signal block), SRS, etc., to obtain spatial characteristics and interference direction of the spatial users, and uses a zero forcing beamforming method to construct corresponding spatial receiving weights for uplink receiving, so as to separate signals of different users.
For example, the base station estimates spatial characteristics of an LTE user according to the SRS signal, estimates spatial characteristics of an NR user according to beam information carried by an SSB or the SRS signal, and then constructs a corresponding spatial receive weight by using the zero-forcing equal-beam forming method described in step S101, so as to separate signals of each UE in each system.
Step S102: and the base station carries out corresponding demodulation processing on the separated LTE and NR signals.
And the base station respectively carries out subsequent receiving demodulation processing such as channel estimation, equalization, decoding and the like on the separated LTE and NR signals.
As shown in fig. 3, an embodiment of the present invention provides another space division multiplexing method for LTE and NR networks, including:
step S201: the base station constructs corresponding space sending weight values to carry out joint precoding weighting on signals by combining information such as space characteristics, interference directions and the like of LTE and NR space division users (simultaneous co-frequency scheduling) and using precoding algorithms such as zero forcing and the like.
As shown in fig. 4, two LTE users and one NR user occupy the same time-frequency resource, and the number of base station antennas is NBSThe number of antennas at the UE end is NUETaking the channel estimation of the base station using the last time as an example, the spatial characteristics of the LTE user can be expressed as
Figure BDA0002072335980000051
And
Figure BDA0002072335980000052
the spatial signature of an NR user may be expressed as
Figure BDA0002072335980000053
They are all NBS*NUEOf the matrix of (a). The space transmission weight obtained by the zero-forcing precoding algorithm is:
Wdownlink＝HH[HHH]-1
wherein
Figure BDA0002072335980000054
Is a 3NUE×NBSRepresents a combination of spatial signatures or interference directions of LTE and NR users, wherein (-)TIndicating transposition.
The signals after the spatial transmit weights are used to perform joint precoding weighting on the transmit signals are:
Yspatial_precoding＝WdownlinkY
where Y is the signal before the joint precoding weighting, Yspatial_precodingIs the transmitted signal after the joint precoding weighting.
The constructed combined precoding weights respectively point to a terminal 1 and a terminal 2 aiming at an LTE user, and are null in the direction of a terminal 3; the NR users are pointed to the terminal 3, and nulls are performed in the directions of the terminal 1 and the terminal 2, so that the spatial domain joint precoding weights can effectively reduce the mutual interference between the terminals.
Preferably, the base station uses channel estimation of the base station, such as channel estimation of reference signals such as SRS and DMRS based on the LTE/NR system, and uses a precoding algorithm such as zero forcing to construct corresponding spatial transmission weights, and performs joint precoding weighting on the signals.
For example, the base station uses the historical channel information of LTE and NR users estimated based on the reference signals such as SRS and DMRS, and then constructs corresponding spatial transmission weights to perform joint precoding weighting on the signals by using the precoding algorithm such as zero forcing described in step 1.
Preferably, the base station uses the channel information reported by the user, for example, the channel estimation based on reference signals such as DMRS, CSIRS, CRS and the like reported by the user in the LTE system, the channel estimation based on reference signals such as DMRS, CRIRS and the like reported by the user in the NR system, and constructs a corresponding spatial transmission weight using precoding algorithms such as zero forcing and the like, to perform joint precoding weighting on the signals.
For example, the LTE user estimates the current channel state by using DMRS, CSIRS, CRS reference signals, the NR user estimates the current channel state by using DMRS, CSIRS, and other reference signals, and reports the current channel state to the base station, and the base station constructs a corresponding spatial transmission weight to perform joint precoding weighting on the signal by using the precoding algorithm such as zero forcing described in step S201.
Preferably, the base station obtains spatial characteristics and interference directions of space division users by using beam information of the reference signal, for example, based on beam information carried by an SSB, an SRS, and the like in the LTE/NR system, constructs a corresponding spatial transmission weight by using a precoding algorithm such as zero forcing, and performs joint precoding weighting on the signal.
For example, the base station estimates information such as spatial characteristics and channel states of LTE users according to SRS signals, estimates information such as spatial characteristics and channel states of NR users according to beam information carried by SSB or SRS signals, and then constructs corresponding spatial transmission weights to perform joint precoding weighting on the signals by using precoding algorithms such as zero forcing described in step S201.
Step S202: and the base station performs corresponding transmission processing on the signal after precoding.
The base station sends the pre-coded signals to IFFT, radio frequency and other modules for subsequent transmission processing.
As shown in fig. 3, the present invention also provides a base station 300, which includes: a processor 301, a transceiver 302, a memory 303, a user interface 304, and a bus interface, wherein:
in this embodiment of the present invention, the base station 300 further includes: a computer program stored on the memory 303 and executable on the processor 301, the computer program, when executed by the processor 301, implementing any of the steps in the space division multiplexing method of the LTE and NR networks described above.
In FIG. 3, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 301, and various circuits, represented by memory 303, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 302 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 304 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 301 is responsible for managing the bus architecture and general processing, and the memory 303 may store data used by the processor 301 in performing operations
The above description is only a preferred example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A method of spatial multiplexing LTE and NR users, comprising:
the base station performs spatial filtering receiving on the received LTE and NR user uplink data, wherein the spatial filtering receiving is used for separating the LTE uplink data and the NR uplink data;
and the base station respectively demodulates the LTE uplink data and the NR uplink data obtained by separation.
2. The spatial multiplexing method of claim 1 wherein the base station spatially filters the received LTE and NR user uplink data, and wherein the spatial filtering for separating the LTE uplink data and the NR uplink data comprises: and the base station constructs a corresponding space receiving weight according to the received uplink data of the LTE and NR users, and performs spatial filtering receiving on the received LTE and NR uplink data according to the space receiving weight.
3. A space division multiplexing method according to claim 2, characterized in that:
and the base station constructs a corresponding space receiving weight by utilizing the channel estimation of the base station in the uplink data.
4. A space division multiplexing method according to claim 2, characterized in that:
and the base station constructs a corresponding space receiving weight by using the channel information reported by the user in the uplink data.
5. A space division multiplexing method according to claim 2, characterized in that:
And the base station constructs a corresponding space receiving weight by using the beam information of the reference signal in the uplink data.
6. A method of spatial multiplexing LTE and NR users, comprising:
the base station carries out combined precoding weighting on the downlink data of the LTE user and the NR user to be sent, wherein the combined precoding weighting is used for separating the downlink data of the LTE user and the NR user;
and the base station respectively transmits the separated LTE user downlink data and NR user downlink data to the LTE user and the NR user.
7. The spatial multiplexing method according to claim 6, wherein the base station performs joint precoding weighting on the downlink data of the LTE and NR users to be transmitted, and the joint precoding weighting is used for separating the downlink data of the LTE and NR users and comprises: and the base station constructs corresponding space sending weight values according to the received uplink data of the LTE and NR users, and performs combined precoding weighting on the downlink data of the LTE and NR users to be sent according to the space sending weight values.
8. The spatial multiplexing method according to claim 7, wherein:
and the base station constructs a corresponding space sending weight by utilizing the channel estimation of the base station in the uplink data.
9. The spatial multiplexing method according to claim 7, wherein:
And the base station constructs a corresponding space sending weight by using the channel information reported by the user in the uplink data.
10. The spatial multiplexing method according to claim 7, wherein:
and the base station constructs a corresponding space sending weight by using the beam information of the reference signal in the uplink data.
11. A base station, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing any of the steps in the spatial multiplexing method according to any of claims 1 to 10 when executing the program.
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