CN111049614A - Remote interference back-off method and base station - Google Patents

Remote interference back-off method and base station Download PDF

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Publication number
CN111049614A
CN111049614A CN201811189919.4A CN201811189919A CN111049614A CN 111049614 A CN111049614 A CN 111049614A CN 201811189919 A CN201811189919 A CN 201811189919A CN 111049614 A CN111049614 A CN 111049614A
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China
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base station
reference signal
sequence
csi
reference point
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CN111049614B (en
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刘建军
柯颋
侯雪颖
徐晓东
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0056—Inter-base station aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0022—PN, e.g. Kronecker
    • H04J13/0029—Gold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a far-end interference backspacing method and a base station, belonging to the technical field of wireless communication, wherein the method applied to a first base station comprises the following steps: selecting a reference signal with the most rear timing reference point or a reference signal which meets a preset energy threshold and has the most rear timing reference point from at least one detected reference signal as a target reference signal, wherein the reference signal is sent by a remote second base station; determining the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent; and the first base station backs the downlink time slot according to the determined back-off duration. In the invention, the back-off duration of the far-end interference is not fixed, but is flexibly determined according to the time domain position of the detected reference signal, so that the downlink resource overhead of executing the interference back-off is reduced as much as possible on the premise of ensuring the far-end interference elimination effect, and the average spectrum efficiency is further improved.

Description

Remote interference back-off method and base station
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a remote interference back-off method and a base station.
Background
In the networking of a TDD (Time Division duplex) system, the same uplink and downlink configuration conditions are generally selected to avoid uplink and downlink interference between cells. And a Guard Period (for example, Guard Period, GP for short) is set between the downlink timeslot and the uplink timeslot, and the length of the Guard Period is generally N (<14) OFDM symbols. The length of the guard interval is selected to ensure that downlink transmission of a base station within a certain range (for example, several tens of kilometers) does not interfere with uplink reception of the base station.
In general, the local base station does not experience interference due to downlink transmission of a base station hundreds of kilometers away, considering the loss of electromagnetic waves propagating in space. However, due to the influence of factors such as atmospheric refraction and propagation environment, downlink transmission of a far-end base station hundreds of kilometers away interferes with uplink reception of the base station, that is, the far-end base station interferes, as shown in fig. 1. The far-end interference range can reach hundreds of kilometers (for example, 300km, propagation delay 1ms, exceeding the guard interval of uplink and downlink switching), and the far-end interference source is a downlink resource before the guard interval of the far-end base station.
Referring to fig. 2 and fig. 3, a solution for far-end base station interference in a conventional TD-LTE (Time Division Long Term Evolution) network mainly includes the following steps:
1. after detecting (experiencing) far-end interference, a disturbed base station (victim) sends an RS (disturbed reference signal); 2. after receiving the RS, an interfering base station (aggregator) executes interference backoff (or backoff); 3. if the interfered base station can not detect the far-end interference, stopping sending the interfered reference signal; 4. and after the interference base station cannot receive the corresponding reference signal, the original sending mode is recovered.
In the existing TD-LTE scheme, an interfered reference signal sent by an interfered base station is generated by a gold sequence (selected from a set of 4 gold sequences in total, length of 1023 points, and extended to 1200 points by zero padding), and a radio frame number where the interfered reference signal is sent and the selected gold sequence are determined by a base station identifier. Specifically, the following mapping relationship is satisfied among the radio frame number where the interfered reference signal is sent, the index number of the selected gold sequence, and the base station identifier:
eNB_ID＝f(gold-index+SFN)
wherein, the eNB _ ID is a base station identifier, the index number of the gold sequence selected by the gold-index is (generally, 2 bits are needed to indicate), and the SFN is a radio frame number where the interfered reference signal is transmitted (generally, 10 bits are needed to indicate).
The interference base station monitors an interfered reference signal RS sent by the interfered base station, the interference base station blindly detects a gold sequence, determines an interfered base station identifier by combining the detected gold sequence and a corresponding radio frame number, and carries out interference backoff, specifically, the ratio of TD-LTE special subframes is backed to 3:2 to 3:9:2 (at this time, DwPTS of the TD-LTE special subframes does not send data, namely DL time slot fixed backoff GP2 of the interference base station protection interval GP1 is 6 OFDM downlink symbols). That is, in the existing interference back-off method, as long as the interfering base station detects the interfered reference signal (which is determined to be a far-end interference source) sent by the interfered base station, the special subframe ratio is back-off from 9:3:2 to 3:9:2, regardless of the specific uplink symbol duration affected by the far-end interference. If the uplink symbols affected by the far-end interference are few, if 6 symbols are backed off according to the above-mentioned back-off method, unnecessary downlink back-off overhead may be caused.
Disclosure of Invention
In view of this, the present invention provides a remote interference back-off method and a base station, which are used to solve the problem that unnecessary downlink back-off overhead is easily caused when the current remote interference back-off duration is fixed.
To solve the above technical problem, in a first aspect, the present invention provides a remote interference back-off method, applied to a first base station, including:
the first base station selects the reference signal with the most back timing reference point or the reference signal which meets a preset energy threshold and has the most back timing reference point from at least one detected reference signal as a target reference signal, wherein the reference signal is sent by a far-end second base station;
the first base station determines the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent;
and the first base station backs the downlink time slot according to the determined back-off duration.
Preferably, the at least one reference signal is located in the same uplink timeslot of the same uplink and downlink switching period of the radio frame.
Preferably, the step of determining the backoff duration of the downlink timeslot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is transmitted includes:
and acquiring a difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is sent, and taking the difference value as the backoff duration.
Preferably, the step of determining the backoff duration of the downlink timeslot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is transmitted includes:
acquiring a first difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted;
and acquiring a second difference between the first difference and a guard interval, and taking the second difference as the backoff duration, wherein the guard interval is arranged between an uplink time slot and a downlink time slot of the first base station.
Preferably, the reference signal is generated by a ZC sequence or a pseudo-random sequence.
Preferably, the pseudo-random sequence includes: gold sequence and CSI-RS sequence.
Preferably, when the reference signal is generated by a gold sequence, the gold sequence is selected from a first preset set, and an index number of the gold sequence in the first preset set, an identifier of the second base station, and a radio frame number of the second base station when the reference signal is transmitted satisfy the following mapping relationship:
eNB_ID＝f(index1+SFN)
the eNB _ ID is an identifier of the second base station, index1 is an index number of the selected gold sequence, SFN is a radio frame number when the second base station transmits the reference signal, and f is a mapping relation function.
Preferably, when the reference signal is generated from a CSI-RS sequence,
the index number of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(index2+SFN)
the eNB _ ID is an identifier of a second base station, index2 is an index number of a selected CSI-RS sequence, SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function;
alternatively, the first and second electrodes may be,
the scrambling code parameter of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(nID+SFN)
wherein eNB _ ID is the identity of the second base station, nIDThe SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
Preferably, the CSI-RS sequence is a first CSI-RS sequence, and the first CSI-RS sequence is selected from a second preset set; or
The CSI-RS sequence is a second CSI-RS sequence, and the second CSI-RS sequence is selected from a third preset set;
the first CSI-RS sequence and the second CSI-RS sequence have different points of at least one of the following:
the time frequency resource configuration is different;
the sequence patterns (Pattern) are different;
the sequence mapping is different.
In a second aspect, the present invention further provides a first base station, including:
the processor is used for selecting the reference signal with the most rear timing reference point or the reference signal which meets a preset energy threshold and has the most rear timing reference point from the detected at least one reference signal as a target reference signal, wherein the reference signal is sent by a far-end second base station; determining the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent; and backing the downlink time slot according to the determined backing time length.
Preferably, the detected at least one reference signal is located in the same uplink timeslot of the same uplink and downlink switching period of the radio frame.
Preferably, the processor is configured to obtain a difference between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted, and use the difference as the backoff duration.
Preferably, the processor is configured to obtain a first difference between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted; and acquiring a second difference between the first difference and a guard interval, and taking the second difference as the backoff duration, wherein the guard interval is arranged between an uplink time slot and a downlink time slot of the first base station.
Preferably, the reference signal is generated by a ZC sequence or a pseudo-random sequence.
Preferably, the pseudo-random sequence includes: gold sequence and CSI-RS sequence.
Preferably, when the reference signal is generated by a gold sequence, the gold sequence is selected from a first preset set, and an index number of the gold sequence in the first preset set, an identifier of the second base station, and a radio frame number of the second base station when the reference signal is transmitted satisfy the following mapping relationship:
eNB_ID＝f(index1+SFN)
the eNB _ ID is an identifier of the second base station, index1 is an index number of the selected gold sequence, SFN is a radio frame number when the second base station transmits the reference signal, and f is a mapping relation function.
Preferably, when the reference signal is generated by a CSI-RS sequence, the index number of the CSI-RS sequence, the identifier of the second base station, and the radio frame number when the second base station transmits the reference signal satisfy the following mapping relationship:
eNB_ID＝f(index2+SFN)
the eNB _ ID is an identifier of a second base station, index2 is an index number of a selected CSI-RS sequence, SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function;
alternatively, the first and second electrodes may be,
the scrambling code parameter of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(nID+SFN)
wherein eNB _ ID is the identity of the second base station, nIDThe SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
Preferably, the CSI-RS sequence is a first CSI-RS sequence, and the first CSI-RS sequence is selected from a second preset set; or
The CSI-RS sequence is a second CSI-RS sequence, and the second CSI-RS sequence is selected from a third preset set;
the first CSI-RS sequence and the second CSI-RS sequence have different points of at least one of the following:
the time frequency resource configuration is different;
the sequence patterns (Pattern) are different;
the sequence mapping is different.
In a third aspect, the present invention also provides a base station, including a memory, a processor, and a computer program stored on the memory and executable on the processor; the processor implements any of the above-described remote interference back-off methods when executing the computer program.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps in any of the remote interference back-off methods described above.
The technical scheme of the invention has the following beneficial effects:
in the embodiment of the present invention, the first base station determines the backoff duration of the downlink timeslot based on the relative relationship between the detected timing reference point of the target reference signal (the reference signal with the most rear timing reference point or the reference signal that satisfies the preset energy threshold and the most rear timing reference point) and the timing reference point when the reference signal is transmitted, so that the backoff duration is not a fixed duration but determined according to the time domain position of the detected reference signal, so as to reduce the downlink resource overhead for performing interference backoff as much as possible on the premise of ensuring the far-end interference cancellation effect, thereby improving the average spectrum efficiency. The remote interference backspacing method is suitable for a 5G NR (fifth generation mobile communication technology-new air interface) system and can also be expanded to other mobile communication systems.
Drawings
FIG. 1 is a schematic diagram of TDD remote base station interference;
fig. 2 is a schematic diagram of a remote base station interference back-off scheme adopted by a conventional TD-LTE network;
fig. 3 is a schematic basic flow chart of a remote base station interference back-off scheme adopted by a conventional TD-LTE network;
fig. 4 is a flowchart illustrating a remote interference back-off method applied to a first base station according to a first embodiment of the present invention;
fig. 5 is a schematic overall flow chart of a remote interference back-off method according to an embodiment of the present invention;
fig. 6 is a second flowchart illustrating an overall procedure of a remote interference back-off method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a first base station according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a base station in a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Referring to fig. 4, fig. 4 is a flowchart illustrating a remote interference back-off method according to an embodiment of the present invention, where the method is applied to a first base station, and includes the following steps:
step 11: the first base station selects the reference signal with the most back timing reference point or the reference signal which meets a preset energy threshold and has the most back timing reference point from at least one detected reference signal as a target reference signal, wherein the reference signal is sent by a far-end second base station;
specifically, the first base station may detect the reference signal based on sequence correlation. The Reference Signal satisfying the predetermined energy threshold may refer to that the Signal strength of the Reference Signal in the detection window is greater than a predetermined threshold, for example, an average value of Reference Signal Receiving Power (RSRP) is greater than the predetermined threshold.
In addition, the first base station may specifically be an interfering base station of far-end interference, and the second base station may specifically be an interfered base station of far-end interference.
Step 12: the first base station determines the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent;
the timing reference point when the reference signal is sent may be that the second base station tells the first base station in some way, or may be a pre-agreed between the base stations, or a protocol is specified, which is not limited herein.
Step 13: and the first base station backs the downlink time slot according to the determined back-off duration.
In the embodiment of the invention, the first base station determines the backoff duration of the downlink time slot of the first base station based on the relative relationship between the detected timing reference point of the target reference signal (the reference signal which is the most back of the timing reference point or the reference signal which meets the preset energy threshold and is the most back of the timing reference point) and the timing reference point when the reference signal is sent, so that the backoff duration is not fixed but flexibly determined according to the time domain position of the detected reference signal, the downlink resource overhead of executing interference backoff is reduced as much as possible on the premise of ensuring the far-end interference elimination effect, and the average spectrum efficiency is further improved. The remote interference back-off method is suitable for a 5G NR (fifth generation mobile communication technology-new air interface) system, and can also be expanded to other mobile communication systems.
Specifically, for a interfering base station (first base station) in the far-end interference, there may be more than one interfered base stations, that is, there may be multiple interfered base stations (second base stations), and the multiple interfered base stations may transmit reference signals on the same radio frame or different radio frames. Therefore, the first base station may detect one or more reference signals in the same uplink timeslot of the same uplink/downlink switching period of the radio frame.
The timing reference point refers to a timing position of an OFDM (Orthogonal Frequency Division Multiplexing) symbol where a reference signal is detected in a time domain determined based on a certain criterion in the same uplink and downlink switching period of a radio frame, or a timing position of an OFDM symbol where the reference signal is sent in the time domain. And when the detected at least one reference signal is positioned in the uplink time slot of the same uplink and downlink switching period of the wireless frame, the reference signal with the most rear timing reference point refers to the last detected reference signal in the uplink time slot of the uplink and downlink switching period.
In the embodiment of the present invention, the method for determining the backoff duration includes the following two methods:
1. selecting the reference signal with the most rear timing reference point from at least one (all) detected reference signals as a target reference signal, and determining the backoff duration according to the timing reference point corresponding to the target reference signal;
2. selecting the reference signal which meets a preset energy threshold and is the most back of a timing reference point from at least one detected reference signal as a target reference signal, and determining the backoff duration according to the timing reference point corresponding to the target reference signal.
In the method for determining the backoff duration in fig. 1, the energy threshold (minimum signal strength) of the detected reference signal is not considered, and the far-end interference can be eliminated to the maximum extent, but the maximum backoff duration is adopted, so that the downlink resource overhead for performing interference backoff is relatively high.
In the method for determining the backoff duration, the energy threshold of the signal is considered when selecting the target reference signal. The method is only suitable for a channel interference reciprocity scene, because only in the channel reciprocity scene, the reference signal energy detected by the first base station is low, which can indicate that the interference energy of the downlink signal of the first base station to the second base station is also low, namely the interference is weak. The method can reduce the downlink resource overhead of executing interference backspacing as much as possible and improve the spectrum efficiency on the premise of ensuring the effect of eliminating the far-end interference.
In addition, in this embodiment, timing reference points when all the second base stations transmit the reference signals are the same, for example, the reference signals transmitted by all the second base stations are located at the same OFDM symbol position of the downlink timeslot in the uplink and downlink switching period in the wireless frame. Preferably, the transmitted reference signal is located in the last 1 or 2 downlink OFDM symbols of the downlink timeslot in the uplink and downlink switching period in the radio frame.
The above remote interference back-off method is exemplified as follows.
Specifically, because the distances of the plurality of second base stations interfered by the first base station are different, after the plurality of second base stations transmit the reference signal, the time for the plurality of second base stations to reach the first base station may be different through different channel transmission delays, and therefore the first base station may detect the plurality of reference signals in the uplink time slot of the same uplink and downlink switching period.
As an optional specific implementation manner, the step of determining, according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is transmitted, a backoff duration of the downlink timeslot of the first base station includes:
and acquiring a difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is sent, and taking the difference value as the backoff duration.
For example, assume that the timing reference point at which the target reference signal is detected is Time _ RS _ rx, the timing reference point at which the reference signal is transmitted is Time _ RS _ tx, and the difference is GP2 ═ Time _ RS _ rx-Time _ RS _ tx. Then, referring to fig. 5, the first base station backs off the downlink transmission time slot (downlink symbol) before the guard interval (GP1) by GP2 to eliminate the far-end interference to the second base station.
According to the embodiment of the invention, the difference value between the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent is directly used as the backoff duration, so that the effect of eliminating the far-end interference can be ensured on the basis of flexibly configuring the backoff duration according to the time domain position of the detected reference signal.
In another optional embodiment, the step of determining, by the first base station, the backoff duration of the downlink timeslot according to the timing reference point when the target reference signal is detected and the timing reference point when the reference signal is transmitted includes:
step 121: acquiring a first difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted;
step 122: and acquiring a second difference between the first difference and a guard interval, and taking the second difference as the backoff duration, wherein the guard interval is arranged between an uplink time slot and a downlink time slot of the first base station.
For example, assume that the timing reference point of the target reference signal detected by the first base station is Time _ RS _ rx, the timing reference point when the reference signal is transmitted is Time _ RS _ tx, the guard interval is GP1, and the second difference is GP2 ═ Time _ RS _ rx-Time _ RS _ tx-GP 1. Then, referring to fig. 5, the first base station backs off the downlink transmission time slot (downlink symbol) before the guard interval (GP1) by GP2 to eliminate the far-end interference to the second base station.
In the embodiment of the present invention, a difference between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted and the guard interval is used as the backoff duration. When far-end interference is eliminated, a backoff duration can be configured according to the detected time domain position of the reference signal, and the overhead of interference backoff is minimum.
Referring to fig. 5 and fig. 6, in the remote interference back-off method provided in the embodiment of the present invention, if the second base station serving as the interfered base station experiences remote interference, the reference signal is sent. After sensing (or receiving) the reference signal, the first base station, which is an interfering base station, determines a backoff duration according to a reference signal (e.g., RS3) with the rearmost timing reference point in a plurality of reference signals (e.g., three reference signals RS1, RS2, and RS3) sensed in an uplink/downlink (UL) slot in an uplink/downlink switching period, and performs interference backoff (or interference backoff) of a Downlink (DL) slot according to the determined backoff duration. After the far-end interference phenomenon (for example, the atmospheric waveguide phenomenon) disappears, the second base station does not experience the far-end interference, the reference signal is stopped being sent, and the first base station does not sense the reference signal, so that the interference backoff is ended and the initial uplink and downlink time slot configuration is recovered.
In this embodiment of the present invention, for the reference signal sent by the second base station, a new sequence that is not available in an existing 3GPP (third generation partnership project) protocol may be introduced, an existing sequence in the 3GPP protocol may be adopted, and a modified sequence based on the existing sequence in the 3GPP protocol may be adopted. Optionally, the reference signal is generated by a ZC sequence or a pseudo-random sequence. Among them, ZC sequences, i.e., Zadoff-Chu sequences, have very good autocorrelation and very low cross-correlation. The pseudo-random sequence comprises a gold sequence and a CSI-RS sequence.
In an alternative embodiment, the reference signal is generated by a gold sequence (one of the pseudo-random sequences) selected from a first predetermined set.
Optionally, the index number of the gold sequence in the first preset set, the identifier of the second base station, and the radio frame number when the second base station transmits the reference signal satisfy the following mapping relationship:
eNB_ID＝f(index1+SFN)
the eNB _ ID is an identifier of the second base station, index1 is an index number of the selected gold sequence, SFN is a radio frame number when the second base station transmits the reference signal, and f is a mapping relation function.
In other embodiments, the identifier of the second base station, the radio frame number when the second base station transmits the reference signal, and other associated parameters of the gold sequence may also satisfy a preset mapping relationship.
The first preset set may include 2, 4, 8 or other numbers of gold sequences, and when there are a plurality of second base stations, that is, when there are a plurality of interfered base stations, each of the second base stations selects one gold sequence from the first preset set according to the mapping relationship and generates the reference signal.
Preferably, the second base station transmits the reference signal at a downlink symbol immediately before a guard interval.
The first base station listens to the reference signal (i.e. blind gold sequence) in the uplink timeslot after the guard interval, and may listen to the gold sequence transmitted by one or more second base stations. When a plurality of reference signals sensed by the first base station are located in the same radio frame, the radio frame numbers (SFNs) are the same, but the timing reference points or gold sequences (index numbers) for detecting the reference signals are different.
And the first base station selects a gold sequence with the most rear timing reference point from the blind-detected gold sequences, and determines the backoff duration of the downlink symbol before the guard interval according to the relative relationship between the timing reference point of the gold sequence and the timing reference point (known as prior information) when the second base station sends the gold sequence.
Aiming at a channel interference reciprocity scene, a gold sequence detection energy threshold can be increased, when a first base station blindly detects a gold sequence in an uplink time slot, a gold sequence with average energy meeting the detection energy threshold is selected from a plurality of detected gold sequences (located in the same wireless frame or different wireless frames), and a gold sequence with the most rear timing reference point is selected from the gold sequences. And determining the back-off time length of the downlink symbol before the guard interval according to the relative relationship between the timing reference point of the gold sequence with the average energy meeting the detection energy threshold and the most back timing reference point and the timing reference point (known as prior information) for sending the gold sequence.
In another alternative embodiment, the reference signal is generated by a CSI-RS (channel state information reference signal) sequence.
Optionally, the index number of the CSI-RS sequence (index number in a preset CSI-RS sequence set), the identifier of the second base station, and the radio frame number when the second base station transmits the reference signal satisfy the following mapping relationship:
eNB_ID＝f(index2+SFN)
the eNB _ ID is an identifier of the second base station, the index2 is an index number of the selected CSI-RS sequence, specifically an index number of the CSI-RS sequence in a CSI-RS sequence set, the SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
Alternatively, the first and second electrodes may be,
the scrambling code parameter of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(nID+SFN)
wherein eNB _ ID is the identity of the second base station, nIDThe SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
In other embodiments, the identifier of the second base station, the radio frame number when the second base station transmits the reference signal, and other associated parameters of the CSI-RS sequence may also satisfy a preset mapping relationship.
Specifically, the CSI-RS sequence is a first CSI-RS sequence, and the first CSI-RS sequence is selected from a second preset set; the second preset set is composed of a part selected from the existing first CSI-RS sequences, so the number of the first CSI-RS sequences in the second preset set is limited, for example, may be several;
or the CSI-RS sequence is a second CSI-RS sequence, and the second CSI-RS sequence is selected from a third preset set; the number of second CSI-RS sequences in the third preset set is also limited, and may be several, for example.
The first CSI-RS sequence and the second CSI-RS sequence have different points of at least one of the following:
the time frequency resource configuration is different;
the sequence patterns (Pattern) are different;
the sequence mapping is different.
The first CSI-RS sequence is an existing CSI-RS sequence in a 3GPP protocol (5G NR (fifth generation communication technology — new air interface) protocol), and the second CSI-RS sequence is a modified sequence of the first CSI-RS sequence. The existing CSI-RS sequence is defined as:
Figure BDA0001827245060000121
r (m) is a CSI-RS sequence, c (-) is a pseudo-randomMachine sequence, CSI-RS sequence initialization factor Cinit：
Figure BDA0001827245060000122
Figure BDA0001827245060000123
Is numbered for slot, l is the OFDM symbol number, nIDAnd scrambling code parameters configured for higher layers.
Specifically, the second base station sends the CSI-RS sequence at the downlink symbol before the guard interval. And the first base station monitors the CSI-RS sequence in an uplink time slot after the guard interval, and may monitor the CSI-RS sequence transmitted by one or more second base stations. When the plurality of intercepted CSI-RS sequences are located in the same radio frame, the radio frame number (SFN) is the same, but the timing reference point or CSI-RS sequence (index number) at which the reference signal is detected is different.
The first base station selects a CSI-RS sequence with the most rear timing reference point from the CSI-RS sequences detected in a blind mode, and determines the backoff duration of a downlink symbol before a guard interval according to the relative relationship between the timing reference point of the CSI-RS sequence and the timing reference point (known as prior information) when the second base station sends the CSI-RS sequence.
Aiming at a channel interference reciprocity scene, a CSI-RS sequence detection energy threshold can be increased, when a first base station blindly detects a CSI-RS sequence in an uplink time slot, a CSI-RS sequence with average energy meeting the detection energy threshold is selected from a plurality of detected CSI-RS sequences (located in the same wireless frame or different wireless frames), and a CSI-RS sequence with the most rear timing reference point is selected from the CSI-RS sequences. And determining the backoff duration of the downlink time slot before the guard interval in the uplink and downlink switching period according to the relative relationship between the timing reference point of the CSI-RS sequence, the average energy of which meets the detection energy threshold and the timing reference point of which the timing reference point is the most back, and the timing reference point (known as prior information) for sending the CSI-RS sequence.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a first base station according to a second embodiment of the present invention, where the first base station 200 includes:
a processor 201, configured to select, from the detected at least one reference signal, the reference signal that is the most behind a timing reference point or the reference signal that satisfies a preset energy threshold and is the most behind the timing reference point as a target reference signal, where the reference signal is sent by a second remote base station; determining the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent; and backing the downlink time slot according to the determined backing time length.
In the embodiment of the invention, the backoff duration of the downlink time slot is determined based on the relative relation between the timing reference point of the detected target reference signal (the reference signal which is the most back of the timing reference point or the reference signal which meets the preset energy threshold and the most back of the timing reference point) and the timing reference point when the reference signal is sent, so that the backoff duration is not fixed but flexibly determined according to the time domain position of the detected reference signal, the downlink resource overhead of executing interference backoff is reduced as much as possible on the premise of ensuring the far-end interference elimination effect, and the average spectrum efficiency is further improved. The remote interference back-off method is suitable for a 5G NR (fifth generation mobile communication technology-new air interface) system, and can also be expanded to other mobile communication systems.
Specifically, the detected at least one reference signal is located in the same uplink timeslot of the same uplink and downlink switching period of the radio frame.
In one embodiment, the processor 201 is configured to obtain a difference between a timing reference point of the target reference signal and a timing reference point when the reference signal is sent, and use the difference as the backoff duration.
In another embodiment, the processor 201 is configured to obtain a first difference between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted; and acquiring a second difference between the first difference and a guard interval, and taking the second difference as the backoff duration, wherein the guard interval is arranged between an uplink time slot and a downlink time slot of the first base station.
Specifically, the reference signal may be generated by a ZC sequence or a pseudo-random sequence.
Specifically, the pseudo random sequence includes: gold sequence and CSI-RS sequence.
In one embodiment, the reference signal is generated by a gold sequence, the gold sequence is selected from a first preset set, and an index number of the gold sequence in the first preset set, an identifier of the second base station, and a radio frame number of the second base station when the reference signal is transmitted satisfy the following mapping relationship:
eNB_ID＝f(index1+SFN)
the eNB _ ID is an identifier of the second base station, index1 is an index number of the selected gold sequence, SFN is a radio frame number when the second base station transmits the reference signal, and f is a mapping relation function.
In another alternative embodiment, the reference signal is generated by a CSI-RS sequence,
the index number of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(index2+SFN)
the eNB _ ID is an identifier of the second base station, index2 is an index number of the selected CSI-RS sequence, the SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
Alternatively, the first and second electrodes may be,
the scrambling code parameter of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(nID+SFN)
wherein eNB _ ID is the identity of the second base station, nIDThe SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
Specifically, the CSI-RS sequence is a first CSI-RS sequence, and the first CSI-RS sequence is selected from a second preset set; or
The CSI-RS sequence is a second CSI-RS sequence, and the second CSI-RS sequence is selected from a third preset set;
the first CSI-RS sequence and the second CSI-RS sequence have different points of at least one of the following:
the time frequency resource configuration is different;
the sequence patterns (Pattern) are different;
the sequence mapping is different.
The embodiment of the present invention is a product embodiment corresponding to the above method embodiment, and therefore, detailed description is omitted here, and please refer to the first embodiment in detail.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a base station according to a third embodiment of the present invention, where the base station 300 includes a processor 301, a memory 302, and a computer program stored in the memory 302 and capable of running on the processor 301; the processor 301, when executing the computer program, implements the following steps:
selecting the reference signal with the most rear timing reference point or the reference signal which meets a preset energy threshold and has the most rear timing reference point from at least one detected reference signal as a target reference signal, wherein the reference signal is sent by a remote second base station;
determining the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent;
and backing the downlink time slot according to the determined backing time length.
In the embodiment of the invention, the first base station determines the backoff duration of the downlink time slot based on the relative relationship between the detected timing reference point of the target reference signal (the reference signal which is the most back of the timing reference point or the reference signal which meets the preset energy threshold and is the most back of the timing reference point) and the timing reference point when the reference signal is sent, so that the backoff duration is not fixed but flexibly determined according to the time domain position of the detected reference signal, the downlink resource overhead of executing interference backoff is reduced as much as possible on the premise of ensuring the far-end interference elimination effect, and the average spectrum efficiency is further improved. The embodiment of the invention is suitable for a 5G NR (fifth generation mobile communication technology-new air interface) system and can also be expanded to other mobile communication systems.
Optionally, the detected at least one reference signal is located in the same uplink timeslot of the same uplink and downlink switching period of the radio frame.
Optionally, the computer program when executed by the processor 301 may further implement the following steps:
the step of determining the backoff duration of the downlink timeslot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent comprises:
and acquiring a difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is sent, and taking the difference value as the backoff duration.
Optionally, the computer program when executed by the processor 301 may further implement the following steps:
the step of determining the backoff duration of the downlink timeslot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent comprises:
acquiring a first difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted;
and acquiring a second difference between the first difference and a guard interval, and taking the second difference as the backoff duration, wherein the guard interval is arranged between an uplink time slot and a downlink time slot of the first base station.
Optionally, the reference signal sequence is generated by a ZC sequence or a pseudorandom sequence.
Optionally, the pseudo-random sequence includes: gold sequence and CSI-RS sequence.
Optionally, when the reference signal is generated by a gold sequence, the gold sequence is selected from a first preset set, and an index number of the gold sequence in the first preset set, an identifier of the second base station, and a radio frame number of the second base station when the reference signal is sent by the second base station satisfy the following mapping relationship:
eNB_ID＝f(index1+SFN)
the eNB _ ID is an identifier of the second base station, index1 is an index number of the selected gold sequence, SFN is a radio frame number when the second base station transmits the reference signal, and f is a mapping relation function.
Optionally, when the reference signal is generated by a CSI-RS sequence,
the index number of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(index2+SFN)
the eNB _ ID is an identifier of the second base station, index2 is an index number of the selected CSI-RS sequence, the SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
Alternatively, the first and second electrodes may be,
the scrambling code parameter of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(nID+SFN)
wherein eNB _ ID is the identity of the second base station, nIDThe SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
Optionally, the CSI-RS sequence is a first CSI-RS sequence, and the first CSI-RS sequence is selected from a second preset set; or
The CSI-RS sequence is a second CSI-RS sequence, and the second CSI-RS sequence is selected from a third preset set;
the first CSI-RS sequence and the second CSI-RS sequence have different points of at least one of the following:
the time frequency resource configuration is different;
the sequence patterns (Pattern) are different;
the sequence mapping is different.
The specific working process of the embodiment of the present invention is the same as that of the first embodiment of the method, and therefore, detailed description is not repeated here, and please refer to the description of the method steps in the first embodiment.
A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in any one of the remote interference back-off methods in the first embodiment. Please refer to the above description of the method steps in the corresponding embodiments.
The Base Station in the embodiment of the present invention may be a Base Transceiver Station (BTS) in Global System for mobile communications (GSM) or Code Division Multiple Access (CDMA), may also be a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), may also be an evolved Node B (eNB, eNodeB) in LTE, or a relay Station, an Access point, or a Base Station in a future 5G network, and the like, and is not limited herein.
The terminal in the embodiments of the present invention may be a wireless terminal or a wired terminal, and the wireless terminal may be a device providing voice and/or other service data connectivity to a user, a handheld device having a wireless connection function, or other processing devices connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, e.g., a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs) are used. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a Terminal (User device or User Equipment), which are not limited herein.
Such computer-readable media, which include both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (20)

1. A method for remote interference back-off is applied to a first base station, and is characterized in that the method comprises the following steps:
the first base station selects the reference signal with the most back timing reference point or the reference signal which meets a preset energy threshold and has the most back timing reference point from at least one detected reference signal as a target reference signal, wherein the reference signal is sent by a far-end second base station;
the first base station determines the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent;
and the first base station backs the downlink time slot according to the determined back-off duration.
2. The method of claim 1, wherein the at least one detected reference signal is located in a same uplink timeslot of a same uplink/downlink switching period of a radio frame.
3. The method of claim 1, wherein the step of determining the backoff duration of the downlink timeslot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is transmitted comprises:
and acquiring a difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is sent, and taking the difference value as the backoff duration.
4. The method of claim 1, wherein the step of determining the backoff duration of the downlink timeslot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is transmitted comprises:
acquiring a first difference value between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted;
and acquiring a second difference between the first difference and a guard interval, and taking the second difference as the backoff duration, wherein the guard interval is arranged between an uplink time slot and a downlink time slot of the first base station.
5. The method of claim 1, wherein the reference signal is generated by a ZC sequence or a pseudo-random sequence.
6. The method of claim 5, wherein the pseudo-random sequence comprises: gold sequence and CSI-RS sequence.
7. The method of claim 6, wherein when the reference signal is generated by a gold sequence, the gold sequence is selected from a first preset set, and an index number of the gold sequence in the first preset set, the identifier of the second base station, and a radio frame number of the second base station when the reference signal is transmitted satisfy the following mapping relationship:
eNB_ID＝f(index1+SFN)
the eNB _ ID is an identifier of the second base station, index1 is an index number of the selected gold sequence, SFN is a radio frame number when the second base station transmits the reference signal, and f is a mapping relation function.
8. The method of claim 6, wherein when the reference signal is generated by a CSI-RS sequence,
the index number of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(index2+SFN)
the eNB _ ID is an identifier of a second base station, index2 is an index number of a selected CSI-RS sequence, SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function;
alternatively, the first and second electrodes may be,
the scrambling code parameter of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(nID+SFN)
wherein eNB _ ID is the identity of the second base station, nIDThe SFN is the scrambling code parameter of the selected CSI-RS sequenceAnd f is a mapping relation function when the reference signal is sent.
9. The method for remote interference back-off of claim 8,
the CSI-RS sequence is a first CSI-RS sequence which is selected from a second preset set; or
The CSI-RS sequence is a second CSI-RS sequence, and the second CSI-RS sequence is selected from a third preset set;
the first CSI-RS sequence and the second CSI-RS sequence have different points of at least one of the following:
the time frequency resource configuration is different;
the sequence patterns are different;
the sequence mapping is different.
10. A first base station, comprising:
the processor is used for selecting the reference signal with the most rear timing reference point or the reference signal which meets a preset energy threshold and has the most rear timing reference point from the detected at least one reference signal as a target reference signal, wherein the reference signal is sent by a far-end second base station; determining the backoff duration of the downlink time slot of the first base station according to the timing reference point of the detected target reference signal and the timing reference point when the reference signal is sent; and backing the downlink time slot according to the determined backing time length.
11. The first base station of claim 10, wherein the detected at least one reference signal is located in a same uplink timeslot of a same uplink and downlink switching period of a radio frame.
12. The first base station of claim 10, wherein the processor is configured to obtain a difference between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted, and use the difference as the backoff duration.
13. The first base station of claim 10, wherein the processor is configured to obtain a first difference between a timing reference point of the target reference signal and a timing reference point when the reference signal is transmitted; and acquiring a second difference between the first difference and a guard interval, and taking the second difference as the backoff duration, wherein the guard interval is arranged between an uplink time slot and a downlink time slot of the first base station.
14. The first base station of claim 10, wherein the reference signal is generated by a ZC sequence or a pseudo-random sequence.
15. The first base station of claim 14, wherein the pseudo-random sequence comprises: gold sequence and CSI-RS sequence.
16. The first base station of claim 15, wherein when the reference signal is generated by a gold sequence, the gold sequence is selected from a first preset set, and an index number of the gold sequence in the first preset set, an identifier of the second base station, and a radio frame number of the second base station when the reference signal is transmitted satisfy the following mapping relationship:
eNB_ID＝f(index1+SFN)
the eNB _ ID is an identifier of the second base station, index1 is an index number of the selected gold sequence, SFN is a radio frame number when the second base station transmits the reference signal, and f is a mapping relation function.
17. The first base station of claim 15, wherein when the reference signal is generated by a CSI-RS sequence,
the index number of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(index2+SFN)
the eNB _ ID is an identifier of a second base station, index2 is an index number of a selected CSI-RS sequence, SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function;
alternatively, the first and second electrodes may be,
the scrambling code parameter of the CSI-RS sequence, the identifier of the second base station and the radio frame number when the reference signal is sent by the second base station satisfy the following mapping relation:
eNB_ID＝f(nID+SFN)
wherein eNB _ ID is the identity of the second base station, nIDThe SFN is a radio frame number when the second base station sends the reference signal, and f is a mapping relation function.
18. The first base station of claim 17,
the CSI-RS sequence is a first CSI-RS sequence which is selected from a second preset set; or
The CSI-RS sequence is a second CSI-RS sequence, and the second CSI-RS sequence is selected from a third preset set;
the first CSI-RS sequence and the second CSI-RS sequence have different points of at least one of the following:
the time frequency resource configuration is different;
the sequence patterns are different;
the sequence mapping is different.
19. A base station comprising a memory, a processor and a computer program stored on the memory and executable on the processor; characterized in that the processor implements the remote interference back-off method according to any of claims 1-9 when executing the computer program.
20. 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 remote interference back-off method according to any one of claims 1-9.
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