CN111555848A - Reference signal transmission method and communication equipment - Google Patents

Reference signal transmission method and communication equipment Download PDF

Info

Publication number
CN111555848A
CN111555848A CN201910109997.7A CN201910109997A CN111555848A CN 111555848 A CN111555848 A CN 111555848A CN 201910109997 A CN201910109997 A CN 201910109997A CN 111555848 A CN111555848 A CN 111555848A
Authority
CN
China
Prior art keywords
sequence
frequency
reference signal
domain
subsequence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201910109997.7A
Other languages
Chinese (zh)
Other versions
CN111555848B (en
Inventor
柯颋
张静文
夏亮
吴丹
刘建军
王启星
刘光毅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Mobile Zijin Jiangsu Innovation Research Institute Co ltd
China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
Original Assignee
China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Mobile Communications Group Co Ltd, China Mobile Communications Ltd Research Institute filed Critical China Mobile Communications Group Co Ltd
Priority to CN201910109997.7A priority Critical patent/CN111555848B/en
Publication of CN111555848A publication Critical patent/CN111555848A/en
Application granted granted Critical
Publication of CN111555848B publication Critical patent/CN111555848B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

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

Abstract

The invention provides a reference signal transmission method and communication equipment, belonging to the technical field of wireless communication, wherein the method applied to first communication equipment comprises the following steps: determining a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal; dividing the first sequence into a first subsequence and a second subsequence; mapping the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers does not overlap with resources in the second set of frequency-domain subcarriers. In the reference signal, the part which is not overlapped with the OCC scrambling code sequence of the frequency domain is used for estimating RS time delay, and then the overlapped OCC scrambling code sequence in the reference signal can be correctly distinguished by eliminating the RS fuzzy problem according to the estimated RS time delay.

Description

Reference signal transmission method and communication equipment
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a reference signal transmission method and a communication device.
Background
In inland areas where spring, summer and fall meet, or coastal areas in winter, an atmospheric waveguide (surface reduction) phenomenon is likely to occur. For a cellular wireless communication system (e.g., 4G LTE (fourth generation mobile communication technology — long term evolution) system or 5G NR (fifth generation mobile communication technology — new air interface) system), when an atmospheric wave guide phenomenon occurs, a DL (downlink) signal of a remote base station will cause strong interference to UL (uplink) data reception of a local base station.
Some solutions for solving the problem of far-end Interference in the existing 3GPP (Third Generation Partnership project) protocol need to carry base station ID (IDentifier) information through RIM-RS (Remote Interference management reference Signal). And, in order to improve the remote interference phenomenon detection effect, it is preferable that each base station uses different RIM-RS resources. However, in a reasonable transmission period range and under the constraint of acceptable RS detection complexity, RIM-RS resources distinguishable by the usually adopted CDM (code division multiplexing), TDM (time division multiplexing) and FDM (frequency division multiplexing) modes are limited, and the requirements of a base station with the magnitude of millions cannot be met. Therefore, a new resource multiplexing method, OCC (Orthogonal Cover Code), is proposed. In the 4G LTE system, only the time domain OCC is supported, that is, the OCC scrambling code is superimposed on a plurality of adjacent OFDM (Orthogonal frequency division Multiplexing) symbols. In the 5G NR system, both time domain OCC and frequency domain OCC are supported, that is, OCC scrambling codes are respectively superposed on a plurality of adjacent OFDM symbols and a plurality of adjacent subcarriers.
However, although the 5G NR system already supports the frequency domain OCC scrambling method, research shows that when the relative delay of two RSs (i.e. reference signals) using different frequency domain OCC scrambling codes (which may also be referred to as scrambling sequences, or scrambling sequences, etc.) is small, the two RSs can be correctly distinguished; otherwise, when the delay time is too large, the two RSs can not be correctly distinguished. That is, the frequency domain OCC scrambling code has an ambiguity problem. In existing NR systems, multiple RSs arrive at the receiver at approximately the same time, with the delay between each two usually within one CP (cyclic prefix). Based on the prior information that the RS arrival delay is less than the CP, the receiver can easily eliminate the falsely detected RS. Therefore, the OCC ambiguity problem does not exist, and different OCC scrambling sequences can be correctly distinguished.
However, in the RIM (remote interference management) scenario, the distance between base stations is especially far, and the distance between RSs transmitted by different base stations may be especially large, for example, several hundred km apart. In this case, it is highly possible that multiple RSs are received simultaneously within one detection window. In this case, when the first RS arrives, the receiver may detect a plurality of RSs simultaneously through a correlation algorithm. The receiver cannot exclude any possible RS by a priori information. Therefore, in the RIM scenario, the frequency domain OCC scrambling scheme cannot be used directly.
Disclosure of Invention
In view of the above, the present invention provides a reference signal transmission method and a communication device, which are used to solve the problem that RS confusion may occur when a frequency domain OCC scrambling method is directly used in an RIM scenario.
In order to solve the above technical problem, in a first aspect, the present invention provides a reference signal transmission method applied to a first communication device, including:
determining a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal;
dividing the first sequence into a first subsequence and a second subsequence;
mapping the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers does not overlap with resources in the second set of frequency-domain subcarriers.
Preferably, the reference signal
Figure BDA0001967732860000021
Wherein k is a frequency domain resource identifier, and f is a functional relation;
Figure BDA0001967732860000022
and μ is a subcarrier spacing configuration parameter of the first communication device, and represents a reference signal transmitted by an antenna port p on the kth subcarrier and the l-th OFDM symbol.
Preferably, the first and second liquid crystal materials are,
Figure BDA0001967732860000031
wherein m ═ k-koffsetβ is the power control coefficient, koffsetIs a frequency domain offset, r1(m') is said first sequence, r2(m') is said second sequence, Lseq1Is the length of the first sequence, Lseq2For the length of the second sequence, the first set of frequency domain subcarriers is { k }offset+Lseq2,koffset+Lseq2+1,…,koffset+Lseq1-1} and the second set of frequency-domain subcarriers is { k }offset,koffset+1,…,koffset+Lseq2-1}。
Preferably, the first sequence is generated according to one of the following sequences:
a pseudo-random sequence;
a low PAPR sequence.
Preferably, the length of the first subsequence is greater than or equal to the length of the second subsequence.
Preferably, when the first sequence is a pseudo-random sequence, the initialization value of the pseudo-random sequence is determined according to a packet identifier (Set ID) of the first communication device, where the packet identifier is configured by a network management unit.
Preferably, the step of determining the first sequence and the second sequence for generating the reference signal comprises:
determining a third sequence from the third set of sequences;
determining the second sequence from the third sequence, the second sequence being a repetition of the third sequence.
Preferably, r2(m′)＝r3(m′modLseq3)，
Wherein r is2(m') is said second sequence, r3(m') is said third sequence, Lseq3Is the length of the third sequence.
Preferably, all third sequences in the set of third sequences are equal in length;
when the length of the third sequence is 2, the third sequence set is
Figure BDA0001967732860000032
Figure BDA0001967732860000033
Wherein m is1,m2Are both 0 or 1;
when the length of the third sequence is 4, the third sequence set is
Figure BDA0001967732860000034
Figure BDA0001967732860000035
Figure BDA0001967732860000036
Wherein m is1,m2,m3,m4Are both 0 or 1;
when the length of the third sequence is 8, the third sequence set is
Figure BDA0001967732860000041
Figure BDA0001967732860000042
Figure BDA0001967732860000043
Wherein m is1,m2,m3,m4,m5,m6,m7,m8Are both 0 or 1;
when the length of the third sequence is 12, the third sequence set is:
Figure BDA0001967732860000044
Figure BDA0001967732860000045
Figure BDA0001967732860000046
wherein m is1,m2,m3,m4,m5,m6,m7,m8,m9,m10,m11,m12Are both 0 or 1.
Preferably, the step of determining the third sequence from the set of third sequences comprises:
determining the third sequence from the set of third sequences according to a first parameter, the first parameter comprising at least one of:
a packet flag of the first communication device;
transmitting a time parameter of the reference signal;
and transmitting the antenna port identification of the reference signal.
Preferably, the reference signal is used to indicate at least one of:
the first communication device is subject to far-end interference;
a maximum number of uplink OFDM symbols subject to far-end interference in the first communication device;
the phenomenon of atmospheric wave guide exists;
a packet flag of the first communication device.
In a second aspect, the present invention further provides a reference signal transmission method, applied to a second communication device, including:
receiving a reference signal sent by a first communication device, wherein the reference signal is obtained by the first communication device by dividing a first sequence used for generating the reference signal into a first subsequence and a second subsequence, mapping the first subsequence to a first frequency-domain subcarrier set of a frequency-domain resource set used for sending the reference signal, and mapping a product of the second subsequence and the second sequence to a second frequency-domain subcarrier set of the frequency-domain resource set, and resources in the first frequency-domain subcarrier set and the second frequency-domain subcarrier set are not overlapped.
Preferably, after the step of receiving the reference signal transmitted by the first communication device, the method further includes:
acquiring a transmission delay range of the reference signal according to a part of signals corresponding to the first frequency domain subcarrier set in the reference signal;
and acquiring the second sequence adopted by the part of signals corresponding to the second frequency domain subcarrier set according to the transmission delay range.
In a third aspect, the present invention further provides a first communication device, including:
a processor configured to determine a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal; dividing the first sequence into a first subsequence and a second subsequence;
a transceiver configured to map the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and map a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers and resources in the second set of frequency-domain subcarriers do not overlap.
In a fourth aspect, the present invention further provides a second communication device, including:
a transceiver configured to receive a reference signal sent by a first communication device, where the reference signal is obtained by the first communication device by dividing a first sequence used for generating the reference signal into a first subsequence and a second subsequence, mapping the first subsequence to a first set of frequency-domain subcarriers of a set of frequency-domain resources for sending the reference signal, and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, where resources in the first set of frequency-domain subcarriers and resources in the second set of frequency-domain subcarriers do not overlap.
In a fifth aspect, the present invention also provides a communication device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor; the processor, when executing the computer program, implements any of the above-described reference signal transmission methods.
In a seventh aspect, the present invention also provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, realizes the steps in any one of the above-mentioned reference signal transmission methods.
The technical scheme of the invention has the following beneficial effects:
in the embodiment of the invention, when the reference signal is generated, the frequency domain OCC scrambling code sequence is only superposed on part of frequency domain resources for transmitting the reference signal, and the frequency domain OCC scrambling code sequence is not superposed on the other part of frequency domain resources. In the reference signal, the part which is not overlapped with the OCC scrambling code sequence of the frequency domain is used for estimating RS time delay, and then the other part of the overlapped OCC scrambling code sequence of the reference signal can be correctly distinguished by eliminating the RS fuzzy problem according to the estimated RS time delay.
Drawings
FIG. 1 is a schematic view of atmospheric waveguiding phenomena;
FIG. 2 is a diagram illustrating interference from a remote base station;
FIG. 3 is a schematic diagram of two reference signals (RS1 and RS2) generated using different OCCs, respectively;
FIG. 4 is a diagram illustrating detection of two reference signals (RS1 arrived and RS2 not arrived) shown in FIG. 3;
fig. 5 is a flowchart illustrating a reference signal transmission method according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a reference signal transmission method according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a first communication device in a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a second communication device in the fourth embodiment of the present invention;
fig. 9 is a schematic structural diagram of a first communication device in a fifth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a second communication device in the sixth 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.
When the atmospheric wave guide phenomenon occurs, as shown in fig. 1, a layer with inverse temperature or water vapor sharply reduced along with the height exists in the troposphere, and is called a wave guide layer, and most radio wave radiation is limited in the wave guide layer to carry out super-refraction propagation. Beyond-the-horizon propagation allows radio signals to travel great distances and suffer from low path propagation losses.
As shown in fig. 2 (propagation time delay, GP, Guard Period, uplink/downlink conversion protection time slot, DwPTS, downlink pilot time slot, and UwPTS, uplink pilot time slot), because there is an atmospheric waveguide layer, after a DL signal sent by a remote Interference station (Interference site, or aggregation site, or Interference site) is propagated through an ultra-long distance (e.g., tens of kilometers) space, the DL signal still has high energy, and the DL signal falls into a UL signal receiving window of a local Interference station (victim, or Interference site), so as to cause strong Interference to UL data reception of the local base station.
In a TD-LTE (Time Division Long Term Evolution) network, it is found that TD-LTE in large area in many provinces such as Jiangsu, Anhui, Hainan and Henan is disturbed in an uplink mode, the uplink IOT is lifted by 25dB, and KPI indexes such as RRC connection establishment success rate are seriously deteriorated. The interfered cell mainly takes a rural F frequency band, the interference time is mainly concentrated on 0:00-8:00, and the number of affected base stations is hundreds to tens of thousands.
In a deployment scenario of NR asymmetric spectrum (LTE-equivalent TDD system (time division duplex system, also referred to as TD-LTE system)), there still exists a far-end interference problem due to atmospheric waveguide. Therefore, the 3GPP has established the NR-RIM (Remote Interference Management for NR) problem at the Rel-16 stage in order to systematically solve the Remote Interference problem from the standardization level.
In the 3GPP RAN1#94 conference, agree has three types of frame (architecture), including: frame-0, frame-1, frame-2 (including frame-2.1 and frame-2.2). Wherein, in both frame 2-1 and 2-2, the base station ID information needs to be carried through RIM-RS. RIM-RS resources are typically distinguished using CDM, TDM, and FDM approaches, where CDM refers to using different pseudo-random sequences, TDM refers to using different time-domain transmission positions, and FDM refers to using different frequency-domain transmission positions. Different RIM-RS resources are used to carry base station ID information. In particular, it is possible that multiple base stations use the same RIM-RS resource. However, in order to improve the remote interference phenomenon detection effect, it is preferable that each base station uses different RIM-RS resources.
Since there may be 400 tens of thousands of base stations in a 5G NR network, and the number of RS resources that can be distinguished by the commonly employed CDM, TDM, and FDM approaches is limited within a reasonable transmission period (e.g., 2 minutes) and under the constraints of acceptable RS detection complexity (e.g., up to 8 pseudo-random sequences can be detected simultaneously), it is difficult for each base station to use different RIM-RS resources.
Therefore, new resource reuse modes need to be researched. The OCC is a resource multiplexing mode commonly used in 4G LTE and 5G NR systems. In particular, in the 4G LTE system, only the time domain OCC is supported, that is, the OCC scrambling codes are superimposed on a plurality of adjacent OFDM symbols.
For example, in the LTE system, the frequency domain resource mapping method of the CSI-RS is as follows:
Figure BDA0001967732860000081
wherein,
Figure BDA0001967732860000082
which represents the frequency domain complex signal corresponding to the antenna port p' on the k sub-carrier, the l OFDM symbol, wherein,
Figure BDA0001967732860000083
is a pseudo-random sequence, and wp'(i) Scrambling codes for the time domain OCC. Wherein, wp'(i) The values are given in table 1 below.
TABLE 1
Figure BDA0001967732860000084
In the 5G NR system, both time domain OCC and frequency domain OCC are supported, that is, OCC scrambling codes are respectively superposed on a plurality of adjacent OFDM symbols and a plurality of adjacent subcarriers.
For example, in the NR system, the frequency domain resource mapping method of the DMRS of the PDSCH is as follows:
Figure BDA0001967732860000085
Figure BDA0001967732860000086
k′＝0,1
Figure BDA0001967732860000087
n＝0,1,...
wherein,
Figure BDA0001967732860000091
which represents the frequency domain complex signal corresponding to the antenna port p on the kth subcarrier, the l OFDM symbol, wherein,
Figure BDA0001967732860000092
for power control coefficients, r (2n + k') is a pseudo-random sequence, wf(k') and wt(l') denote a frequency domain OCC scrambling code and a time domain OCC scrambling code, respectively. Configuration type 1 and Configuration type 2 are Configuration types 1 and 2, respectively. w is af(k') and wt(l') the values are given in Table 2 below.
TABLE 2
Figure BDA0001967732860000093
Although the frequency domain OCC scrambling mode is supported in the 5G NR system, research shows that when the relative delay of two RSs adopting different frequency domain OCC scrambling codes is small (such as smaller than FFT size/OCC length), the two RSs can be correctly distinguished; otherwise, when the two delays are too large (greater than or equal to FFT size/OCC length), the two RSs cannot be correctly distinguished. The FFT size refers to the number of samples for FFT operation within 1 OFDM symbol, and OCC length represents the length of the scrambling sequence in OCC. For example, when the OCC scrambling sequence is [1,1], OCC length is 2; and when the OCC scrambling sequence is [1,1,1,1], OCC length is 4.
As shown in FIG. 3 (freq is frequency), RS1 and RS2 use different frequency domain OCC scrambling codes (differential OCC)OCC scrambling sequences are [1,1 respectively]And [1, -1]. As shown in fig. 4, when the time domain lengths of RS1 and RS2 are 2 OFDM symbols, the Detection Window (DW) is 1 OFDM symbol. Let us receive only the RS1 signal, and the received RS1 signal falls completely within the detection window, and perform the correlation detection with the received signal by using the reproduced RS1 sequence locally, at τ1Obtaining a larger autocorrelation peak at a moment, and recording the size of the peak as PACF. But if RS2 is used to correlate the received signal, it will be
Figure BDA0001967732860000094
Detects a large cross-correlation peak and marks the peak size as PCCF. Can find PCCF＝PACF. Wherein N isFFTDenotes FFTsize. Since RS2 has not actually arrived, then detection of RS2 is actually a false alarm.
The reason is that S (f) represents the frequency domain sequence of RIM-RS, h (t) and H (f) represent the time domain and frequency domain response functions of the multipath channel respectively, and the functions are recorded
Figure BDA0001967732860000101
Then
Figure BDA0001967732860000102
The frequency domain received signal r (f) can be expressed as
Figure BDA0001967732860000103
In particular, the signal R is received in the frequency domain on subcarrier kkCan be further expressed as
Figure BDA0001967732860000104
Where Δ f denotes a subcarrier spacing.
Frequency domain of a frequency domain transmit signal on subcarrier kSequence SkIs shown as
Sk＝Ck·wf(k′)
Wherein, CkDenotes a base sequence, and wf(k') represents a frequency domain OCC scrambling sequence, then
Figure BDA0001967732860000105
Record again
Ak(τ)＝wf(k') exp (-j2 π k Δ f τ) (equation 1)
The signal R may be received in the frequency domain on subcarrier kkIt is briefly described as
Figure BDA0001967732860000106
As shown in table 3 below, [ +1, +1 when τ is 0]A corresponding to scrambling codek(τi) (and Rk) And when
Figure BDA0001967732860000107
When [ +1, -1]A corresponding to scrambling codek(τi) (and Rk) The same is true.
TABLE 3Ak(τ) fuzzy schematic
Figure BDA0001967732860000108
Figure BDA0001967732860000111
Note that the sampling rate of an OFDM system is
Figure BDA0001967732860000112
Then
Figure BDA0001967732860000113
I.e. correspond to
Figure BDA0001967732860000114
A sampling point where N isFFTThe FFT size is shown.
More generally, consider the reception of a sequence R in the frequency domainkAnd local reproduction sequence
Figure BDA0001967732860000115
Figure BDA0001967732860000116
Conjugate multiplication and cumulative summation are carried out, and the obtained correlation function is as follows:
Figure BDA0001967732860000117
when OCC length MOCC＝2，wf(k′)＝[1，1]When M is greater than MOCC＝4，wf(k′)＝[1，1，1，1]When viewed separately, tables 4 and 5 can be obtained.
Figure BDA0001967732860000118
TABLE 4 OCC length MOCC＝2、wf(k′)＝[1，1]
Figure BDA0001967732860000119
TABLE 5 OCC length MOCC＝4、wf(k′)＝[1，1，1，1]
Figure BDA0001967732860000121
As can be seen from the observation of tables 4 and 5, in general, the frequency domain OCC sequence has the ambiguity problem that when the RS1 with the superimposed first OCC scrambling code is at tau1When the time arrives, if the receiver uses the locally repeated RS1 sequence to perform correlation detection with the received signal, the receiver will detect the time at τ1A larger autocorrelation peak P is detected at that momentACF. At the same time, if the receiver uses locally recurring RSk (k ≠ 1) sequences with the received signalMaking correlation detection, then the receiver will be at
Figure BDA0001967732860000122
The larger cross-correlation peak P is detected at one or more sampling pointsCCF k. Wherein M is more than or equal to 0 and less than or equal to MOCC-1，MOCCRepresents OCC length.
In existing NR systems, multiple RS signals arrive at the receiver at approximately the same time, with a delay between each two typically within one CP. Based on the prior information that the RS arrival delay is less than the CP, the receiver can easily eliminate the falsely detected RS. Therefore, the OCC ambiguity problem does not exist, and different OCC scrambling sequences can be correctly distinguished.
However, in the RIM scenario, the base stations are particularly far apart, and the distance between RSs transmitted by different base stations may be particularly large, such as several hundred km apart. In this case, it is likely that multiple RSs are received simultaneously within one detection window, and the distance between the RSs is larger than
Figure BDA0001967732860000131
At this time, when RS1 arrives, the receiver may detect multiple RSs simultaneously through a correlation algorithm. The receiver cannot exclude any possible RS by a priori information. Therefore, in the RIM scenario, the frequency domain OCC scrambling scheme cannot be used directly.
In summary, in the RIM scenario, more RS multiplexing schemes need to be supported, and the frequency domain OCC is a potential technical solution for effectively increasing the RS multiplexing degree. However, since the delay range of the RS cannot be determined, directly superimposing the OCC scrambling code on the frequency domain may cause RS confusion problems. In order to solve the above contradiction, the present application proposes a sub-band (sub-band) OCC technique, i.e., an OCC scrambling code is superimposed on a part of frequency domain resources, and no OCC scrambling code is superimposed on another part of frequency domain resources. And the sequence without overlapping the OCC scrambling codes is used for estimating the RS time delay range, and the RS fuzzy problem is eliminated according to the time delay estimation result. In this case, the OCC scrambling sequences can be correctly distinguished.
Referring to fig. 5, fig. 5 is a schematic flowchart of a reference signal transmission method according to an embodiment of the present invention, where the method is applied to a first communication device, and includes the following steps:
step 11: determining a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal;
step 12: dividing the first sequence into a first subsequence and a second subsequence;
step 13: mapping the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers does not overlap with resources in the second set of frequency-domain subcarriers.
Wherein the reference signal is RIM-RS. The first communication device is a disturbed base station of far-end interference. The first sequence is a basic sequence of the reference signal, and the second sequence is a frequency domain OCC (Orthogonal Cover Code) scrambling Code sequence. The first frequency domain subcarrier set and the second frequency domain subcarrier set are obtained by dividing the frequency domain resource set into two resource subsets, that is, a set composed of all frequency domain resources in the first frequency domain subcarrier set and all frequency domain resources in the second frequency domain subcarrier set is the frequency domain resource set.
In the embodiment of the invention, when the reference signal is generated, the frequency domain OCC scrambling code sequence is only superposed on part of frequency domain resources for transmitting the reference signal, and the frequency domain OCC scrambling code sequence is not superposed on the other part of frequency domain resources. In the reference signal, the part which is not overlapped with the OCC scrambling code sequence of the frequency domain is used for estimating RS time delay, and then the other part of the overlapped OCC scrambling code sequence of the reference signal can be correctly distinguished by eliminating the RS fuzzy problem according to the estimated RS time delay.
The above-described reference signal transmission method is exemplified below.
In an alternative embodiment, the reference signal (mapping result of frequency domain resource)
Figure BDA0001967732860000141
Wherein k is a frequency domain resource identifier, and f is a functional relation;
Figure BDA0001967732860000142
and μ is a subcarrier spacing configuration parameter of the first communication device, and represents a reference signal transmitted by an antenna port p on the kth subcarrier and the l-th OFDM symbol.
Optionally, f is (x) ═ α x. When k belongs to a first frequency domain subcarrier set, x is the first subsequence; and when k belongs to a second frequency domain subcarrier set, x is the second subsequence x the second sequence.
Specifically, the reference signal is:
Figure BDA0001967732860000143
wherein m ═ k-koffsetβ is the power control coefficient, koffsetIs a frequency domain offset, r1(m') is said first sequence, r2(m') is said second sequence, Lseq1Is the length of the first sequence, Lseq2For the length of the second sequence, the first set of frequency domain subcarriers is { k }offset+Lseq2，koffset+Lseq2+1，…，koffset+Lseq1-1} and the second set of frequency-domain subcarriers is { k }offset，koffset+1，…，koffset+Lseq2-1}。
Optionally, the first sequence is generated according to one of the following sequences:
pseudo-random sequences, see section 5.2.1 of 3GPP communications protocol 38.211;
a sequence of low PAPR (Peak to Average Power Ratio, Peak to Average Power Ratio for short) can be referred to in section 5.2.2 of 3GPP communication protocol 38.211.
Optionally, the length of the first subsequence is greater than or equal to the length of the second subsequence.
Preferably, when the first sequence is a pseudo-random sequence, the initialization value of the pseudo-random sequence is determined according to a packet identifier (Set ID) of the first communication device, where the packet identifier is configured by a network management unit.
As an optional implementation manner of the other embodiment, in a case that the first sequence is a pseudorandom sequence, the initialization value of the pseudorandom sequence, or the identifier of the initialization value of the pseudorandom sequence, is determined according to a first parameter, and the first parameter includes at least one of:
the first identification is obtained according to the communication equipment identification of the first communication equipment;
transmitting a time parameter of the reference signal;
and transmitting the antenna port identification of the reference signal.
Specifically, in an alternative embodiment, the initialization value c of the pseudo random sequenceinitF1 (first identification); or, cinitF2 (first identification, time parameter); or, cinitF3 (first id, time parameter, antenna port id), where f1, f2, and f3 are all functional mapping relationships.
In another optional embodiment, the identifier of the initialization value of the pseudorandom sequence is a unique identifier of the initialization value of the pseudorandom sequence in a preset initialization value set, that is, each initialization value in the initialization value set corresponds to a unique identifier different from other initialization values;
and the cross correlation coefficient between the pseudo-random sequences respectively generated according to each initialization value in the initialization value set is smaller than a preset threshold value.
Specifically, the initialization value c of the pseudo-random sequence is first determined by computer preferenceinitValue set of { c }initI.e. the preset initialization value set, and is guaranteed according to the set cinitEvery initialization value c ininitThe respectively generated pseudo-random sequences have better mutual relationshipCorrelation (i.e., the cross-correlation coefficients are all less than a preset threshold). Assume the initialization value set cinitThe size of K1, the value of the flag K1 of the initialization value of the pseudorandom sequence may be an integer satisfying 0. ltoreq. K1. ltoreq. K1-1, or 1. ltoreq. K1. ltoreq. K1. For example, k1 ═ f4 (first identifier); alternatively, k1 ═ f5 (first identifier, time parameter); or k1 ═ f6 (first identifier, time parameter, antenna port identifier), where f4, f5, and f6 are all functional mapping relationships. Finally, according to k1, from cinitValue set of { c }initSelection cinit。
In a specific embodiment, the first sequence is generated according to the following formula:
Figure BDA0001967732860000151
wherein, c (i) is a pseudo random sequence, and is generated according to the following formula:
c(n)＝(x1(n+NC)+x2(n+NC))mod2
x1(n+31)＝(x1(n+3)+x1(n))mod2
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
n＝0，1，...，MPN-1，MPNis the length of the first sequence; n is a radical ofC1600; first m-sequence x1(n) is initialized to x1(0)＝1，x1(n) ═ 0, n ═ 1, 2, ·, 30; second m-sequence x2The initialized value of (n) is represented by cinitIt is determined that,
Figure BDA0001967732860000161
see in particular section 7.4.1.1.1 and section 5.2.1 of the 3GPP communication protocol 38211.
Preferably, the initialization value set is specified by a protocol or configured by Operation Administration Maintenance (OAM).
Optionally, the first identifier is at least one of:
a communication device identification of the first communication device;
a portion of bits in a communication device identification of the first communication device;
the result of performing a MASK operation on the communication device identity of the first communication device, for example, performing and/or operation on the communication device identity and a MASK of the MASK operation, where the MASK of the MASK operation is a [0, 1] string.
Optionally, the communication device identifier of the first communication device is at least one of:
dedicated marks for signaling configuration between the network management unit and/or the base station;
an international mobile subscriber identity;
a temporary identification number generated and maintained by the mobility management entity;
a permanent identification assigned by the device manufacturer;
a dynamic identity assigned by the core network;
cell identity assigned by the core network.
Optionally, the time parameter includes at least one of a radio frame number, a subframe number, a timeslot number, a minislot number, and an ofdm symbol number.
Optionally, the step of determining the first sequence and the second sequence for generating the reference signal includes:
determining a third sequence from the third set of sequences;
determining the second sequence from the third sequence.
In some embodiments of the invention, the second sequence is a repeat of the third sequence.
For example, if the determined third sequence is [ +1, -1, -1, +1], its length is 4. If the length of the second sequence is 100, then the second sequence is repeated 100/4 times { third sequence, third sequence.
In other embodiments of the present invention, r2(m′)＝r3(m′mod Lseq3)，
Wherein r is2(m') is said second sequence, r3(m') is said third sequence, Lseq3Is the length of the third sequence.
Specifically, all the third sequences in the third sequence set have the same length;
when the length of the third sequence is 2, the third sequence set is
Figure BDA0001967732860000171
Figure BDA0001967732860000172
Wherein m is1，m2Are both 0 or 1;
when the length of the third sequence is 4, the third sequence set is
Figure BDA0001967732860000173
Figure BDA0001967732860000174
Figure BDA0001967732860000175
Wherein m is1，m2，m3，m4Are both 0 or 1;
when the length of the third sequence is 8, the third sequence set is
Figure BDA0001967732860000176
Figure BDA0001967732860000177
Figure BDA0001967732860000178
Wherein m is1，m2，m3，m4，m5，m6，m7，m8Are both 0 or 1;
when the length of the third sequence is 12, the third sequence set is:
Figure BDA0001967732860000179
Figure BDA00019677328600001710
Figure BDA00019677328600001711
wherein m is1，m2，m3，m4，m5，m6，m7，m8，m9，m10，m11，m12Are both 0 or 1.
Specifically, the step of determining the third sequence from the third sequence set includes:
determining the third sequence from the set of third sequences according to a first parameter, the first parameter comprising at least one of:
a packet flag of the first communication device;
the time parameter of the reference signal is sent, which may be referred to above specifically;
and transmitting the antenna port identification of the reference signal.
For example, the identifier of the third sequence in the third sequence set is k2, k2 ═ g1 (grouping flag); alternatively, k2 ═ g2 (packet flag, time parameter); alternatively, k2 ═ g3 (packet flag, time parameter, antenna port identification). Wherein g1, g2 and g3 are all function mapping relations.
Optionally, the reference signal is used to indicate at least one of:
the first communication device is subject to far-end interference;
the phenomenon of atmospheric wave guide exists;
a maximum number of uplink OFDM symbols subject to far-end interference in the first communication device;
a packet flag of the first communication device.
It should be noted that, when the first communication device transmits the generated reference signal, if the second communication device (disturbing base station of far-end interference) at the far end can receive the reference signal, it indicates that there is an atmospheric waveguide phenomenon. Further, if the second communication device listens to the reference signal in the xth uplink OFDM symbol, and the second communication device knows in advance that the first communication device (i.e., the communication device that transmitted the reference signal) transmits the downlink symbol position of the reference signal at the unified maximum downlink transmission boundary, the second communication device can estimate the path propagation distance of the reference signal. The second communication device can deduce that if it sends Downlink data (e.g. Physical Downlink Shared CHannel (PDSCH), Downlink reference signal, etc.) at the same maximum Downlink transmission boundary, based on the assumption of CHannel reciprocity, the Downlink data sent by the second communication device will cause far-end interference to at most X uplink OFDM symbols of the first communication device. Thus, the reference signal can provide the maximum number of uplink OFDM symbols subject to far-end interference in the first communication device; x is an integer greater than or equal to 1.
Referring to fig. 6, fig. 6 is a schematic flowchart of a reference signal transmission method according to a second embodiment of the present invention, where the method is applied to a second communication device, and includes the following steps:
step 21: receiving a reference signal sent by a first communication device, wherein the reference signal is obtained by the first communication device by dividing a first sequence used for generating the reference signal into a first subsequence and a second subsequence, mapping the first subsequence to a first frequency-domain subcarrier set of a frequency-domain resource set used for sending the reference signal, and mapping a product of the second subsequence and the second sequence to a second frequency-domain subcarrier set of the frequency-domain resource set, and resources in the first frequency-domain subcarrier set and the second frequency-domain subcarrier set are not overlapped.
And the second communication equipment is an interference base station of far-end interference.
In the embodiment of the present invention, when generating the reference signal, the first communication device superimposes the frequency domain OCC scrambling sequence only on a part of frequency domain resources where the reference signal is transmitted, and does not superimpose the frequency domain OCC scrambling sequence on another part of frequency domain resources. Therefore, the second communication device can estimate the RS time delay by using the part of the reference signal which is not overlapped with the frequency domain OCC scrambling code sequence, and then can correctly distinguish the other part of the overlapped frequency domain OCC scrambling code sequence of the reference signal by eliminating the RS fuzzy problem according to the estimated RS time delay.
Preferably, after the step of receiving the reference signal transmitted by the first communication device, the method further includes:
obtaining the transmission delay range of the reference signal according to the partial signal corresponding to the first frequency domain subcarrier set in the reference signal, for example, determining that the reference signal falls within the transmission delay range of the reference signal
Figure BDA0001967732860000191
Within the interval;
and acquiring the second sequence adopted by the part of signals corresponding to the second frequency domain subcarrier set according to the transmission delay range.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a first communication device according to a third embodiment of the present invention, where the first communication device 30 includes:
a processor 31 for determining a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal; dividing the first sequence into a first subsequence and a second subsequence;
a transceiver 32 configured to map the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and map a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers and resources in the second set of frequency-domain subcarriers do not overlap.
In the embodiment of the invention, when the reference signal is generated, the frequency domain OCC scrambling code sequence is only superposed on part of frequency domain resources for transmitting the reference signal, and the frequency domain OCC scrambling code sequence is not superposed on the other part of frequency domain resources. In the reference signal, the part which is not overlapped with the OCC scrambling code sequence of the frequency domain is used for estimating RS time delay, and then the other part of the overlapped OCC scrambling code sequence of the reference signal can be correctly distinguished by eliminating the RS fuzzy problem according to the estimated RS time delay.
Optionally, the reference signal
Figure BDA0001967732860000192
Figure BDA0001967732860000201
Wherein k is a frequency domain resource identifier, and f is a functional relation;
Figure BDA0001967732860000202
and μ is a subcarrier spacing configuration parameter of the first communication device, and represents a reference signal transmitted by an antenna port p on the kth subcarrier and the l-th OFDM symbol.
Optionally, the reference signal:
Figure BDA0001967732860000203
wherein m ═ k-koffsetβ is the power control coefficient, koffsetIs a frequency domain offset, r1(m') is said first sequence, r2(m') is said second sequence, Lseq1Is the length of the first sequence, Lseq2For the length of the second sequence, the first set of frequency domain subcarriers is { k }offset+Lseq2，koffset+Lseq2+1，…，koffset+Lseq1-1} and the second set of frequency-domain subcarriers is { k }offset，koffset+1，…，koffset+Lseq2-1}。
Optionally, the first sequence is generated according to one of the following sequences:
a pseudo-random sequence;
a low PAPR sequence.
Optionally, the length of the first subsequence is greater than or equal to the length of the second subsequence.
Optionally, when the first sequence is a pseudorandom sequence, the initialization value of the pseudorandom sequence is determined according to a packet flag of the first communication device, where the packet flag is configured by a network management unit.
Optionally, the processor 31 is configured to determine a third sequence from the third set of sequences; and determining the second sequence according to the third sequence, wherein the second sequence is a repetition of the third sequence.
Optionally, r2(m′)＝r3(m′mod Lseq3)，
Wherein r is2(m') is said second sequence, r3(m') is said third sequence, Lseq3Is the length of the third sequence.
Optionally, all third sequences in the third sequence set have the same length;
when the length of the third sequence is 2, the third sequence set is
Figure BDA0001967732860000204
Figure BDA0001967732860000205
Wherein m is1，m2Are both 0 or 1;
when the length of the third sequence is 4, the third sequence set is
Figure BDA0001967732860000206
Figure BDA0001967732860000211
Figure BDA0001967732860000212
Wherein m is1，m2，m3，m4Are both 0 or 1;
when the length of the third sequence is 8, the third sequence set is
Figure BDA0001967732860000213
Figure BDA0001967732860000214
Figure BDA0001967732860000215
Wherein m is1，m2，m3，m4，m5，m6，m7，m8Are both 0 or 1;
when the length of the third sequence is 12, the third sequence set is:
Figure BDA0001967732860000216
Figure BDA0001967732860000217
Figure BDA0001967732860000218
wherein m is1，m2，m3，m4，m5，m6，m7，m8，m9，m10，m11，m12Are both 0 or 1.
Optionally, the processor 31 is configured to determine the third sequence from the third set of sequences according to a first parameter, where the first parameter includes at least one of:
a packet flag of the first communication device;
transmitting a time parameter of the reference signal;
and transmitting the antenna port identification of the reference signal.
Optionally, the reference signal is used to indicate at least one of:
the first communication device is subject to far-end interference;
a maximum number of uplink OFDM symbols subject to far-end interference in the first communication device;
the phenomenon of atmospheric wave guide exists;
a packet flag of the first communication device.
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 second communication device according to a fourth embodiment of the present invention, where the second communication device 40 includes:
a transceiver 41, configured to receive a reference signal sent by a first communication device, where the reference signal is obtained by the first communication device by dividing a first sequence used for generating the reference signal into a first subsequence and a second subsequence, mapping the first subsequence to a first set of frequency-domain subcarriers of a set of frequency-domain resources where the reference signal is sent, and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, where resources in the first set of frequency-domain subcarriers and resources in the second set of frequency-domain subcarriers do not overlap.
In the embodiment of the present invention, when generating the reference signal, the first communication device superimposes the frequency domain OCC scrambling sequence only on a part of frequency domain resources where the reference signal is transmitted, and does not superimpose the frequency domain OCC scrambling sequence on another part of frequency domain resources. Therefore, the second communication device can estimate the RS time delay by using the part of the reference signal which is not overlapped with the frequency domain OCC scrambling code sequence, and then can correctly distinguish the other part of the overlapped frequency domain OCC scrambling code sequence of the reference signal by eliminating the RS fuzzy problem according to the estimated RS time delay.
Optionally, the second communications device further includes a processor, where the processor is configured to obtain a transmission delay range of the reference signal according to a partial signal corresponding to the first frequency-domain subcarrier set in the reference signal; and acquiring the second sequence adopted by the partial signal corresponding to the second frequency domain subcarrier set according to the transmission delay range.
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 second embodiment.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a first communication device according to a fifth embodiment of the present invention, where the first communication device 50 includes a processor 51, a memory 52, and a computer program stored in the memory 52 and capable of running on the processor 51; the processor 51, when executing the computer program, implements the steps of:
determining a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal;
dividing the first sequence into a first subsequence and a second subsequence;
mapping the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers does not overlap with resources in the second set of frequency-domain subcarriers.
In the embodiment of the invention, when the reference signal is generated, the frequency domain OCC scrambling code sequence is only superposed on part of frequency domain resources for transmitting the reference signal, and the frequency domain OCC scrambling code sequence is not superposed on the other part of frequency domain resources. In the reference signal, the part which is not overlapped with the OCC scrambling code sequence of the frequency domain is used for estimating RS time delay, and then the other part of the overlapped OCC scrambling code sequence of the reference signal can be correctly distinguished by eliminating the RS fuzzy problem according to the estimated RS time delay.
Optionally, the reference signal
Figure BDA0001967732860000231
Wherein k is a frequency domain resource identifier, and f is a functional relation;
Figure BDA0001967732860000232
and μ is a subcarrier spacing configuration parameter of the first communication device, and represents a reference signal transmitted by an antenna port p on the kth subcarrier and the l-th OFDM symbol.
Alternatively to this, the first and second parts may,
Figure BDA0001967732860000233
wherein m ═ k-koffsetβ is the power control coefficient, koffsetIs a frequency domain offset, r1(m') is said first sequence, r2(m') is said second sequence, Lseq1Is the length of the first sequence, Lseq2For the length of the second sequence, the first set of frequency domain subcarriers is { k }offset+Lseq2，koffset+Lseq2+1，…，koffset+Lseq1-1} and the second set of frequency-domain subcarriers is { k }offset，koffset+1，…，koffset+Lseq2-1}。
Optionally, the first sequence is generated according to one of the following sequences:
a pseudo-random sequence;
a low PAPR sequence.
Optionally, the length of the first subsequence is greater than or equal to the length of the second subsequence.
Optionally, when the first sequence is a pseudorandom sequence, the initialization value of the pseudorandom sequence is determined according to a packet flag of the first communication device, where the packet flag is configured by a network management unit.
Optionally, the computer program when executed by the processor 51 may further implement the steps of:
the step of determining the first sequence and the second sequence for generating the reference signal comprises:
determining a third sequence from the third set of sequences;
determining the second sequence from the third sequence, the second sequence being a repetition of the third sequence.
Optionally, r2(m′)＝r3(m′mod Lseq3)，
Wherein r is2(m') is said second sequence, r3(m') is said third sequence, Lseq3Is the length of the third sequence.
Optionally, all third sequences in the third sequence set have the same length;
when the length of the third sequence is 2, the third sequence set is
Figure BDA0001967732860000241
Figure BDA00019677328600002410
Wherein m is1，m2Are both 0 or 1;
when the length of the third sequence is 4, the third sequence set is
Figure BDA0001967732860000242
Figure BDA0001967732860000243
Figure BDA0001967732860000244
Wherein m is1，m2，m3，m4Are both 0 or 1;
when the length of the third sequence is 8, the third sequence set is
Figure BDA0001967732860000245
Figure BDA0001967732860000246
Figure BDA0001967732860000247
Wherein m is1，m2，m3，m4，m5，m6，m7，m8Are both 0 or 1;
when the length of the third sequence is 12, the third sequence set is:
Figure BDA0001967732860000248
Figure BDA0001967732860000249
Figure BDA0001967732860000251
Figure BDA0001967732860000252
wherein m is1，m2，m3，m4，m5，m6，m7，m8，m9，m10，m11，m12Are both 0 or 1.
Optionally, the computer program when executed by the processor 51 may further implement the steps of:
the step of determining a third sequence from the set of third sequences comprises:
determining the third sequence from the set of third sequences according to a first parameter, the first parameter comprising at least one of:
a packet flag of the first communication device;
transmitting a time parameter of the reference signal;
and transmitting the antenna port identification of the reference signal.
Optionally, the reference signal is used to indicate at least one of:
the first communication device is subject to far-end interference;
a maximum number of uplink OFDM symbols subject to far-end interference in the first communication device;
the phenomenon of atmospheric wave guide exists;
a packet flag of the first communication device.
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.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a second communication device according to a sixth embodiment of the present invention, where the second communication device 60 includes a processor 61, a memory 62, and a computer program stored in the memory 62 and capable of running on the processor 61; the processor 61, when executing the computer program, performs the following steps:
receiving a reference signal sent by a first communication device, wherein the reference signal is obtained by the first communication device by dividing a first sequence used for generating the reference signal into a first subsequence and a second subsequence, mapping the first subsequence to a first frequency-domain subcarrier set of a frequency-domain resource set used for sending the reference signal, and mapping a product of the second subsequence and the second sequence to a second frequency-domain subcarrier set of the frequency-domain resource set, and resources in the first frequency-domain subcarrier set and the second frequency-domain subcarrier set are not overlapped.
In the embodiment of the present invention, when generating the reference signal, the first communication device superimposes the frequency domain OCC scrambling sequence only on a part of frequency domain resources where the reference signal is transmitted, and does not superimpose the frequency domain OCC scrambling sequence on another part of frequency domain resources. Therefore, the second communication device can estimate the RS time delay by using the part of the reference signal which is not overlapped with the frequency domain OCC scrambling code sequence, and then can correctly distinguish the other part of the overlapped frequency domain OCC scrambling code sequence of the reference signal by eliminating the RS fuzzy problem according to the estimated RS time delay.
Optionally, the computer program when executed by the processor 61 may further implement the steps of:
after the step of receiving the reference signal sent by the first communication device, the method further includes:
acquiring a transmission delay range of the reference signal according to a part of signals corresponding to the first frequency domain subcarrier set in the reference signal;
and acquiring the second sequence adopted by the part of signals corresponding to the second frequency domain subcarrier set according to the transmission delay range.
The specific working process of the embodiment of the present invention is the same as that of the second embodiment of the method, and therefore, the detailed description thereof is omitted, and refer to the description of the method steps in the second embodiment.
A seventh 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 the reference signal transmission method according to any one of the first embodiment and the second embodiment. Please refer to the above description of the method steps in the corresponding embodiments.
The communication device 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 (evolved Node B, eNB or eNodeB) in LTE, or a relay Station or Access point, or a Base Station in a future 5G network, and the like, which is 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 (17)

1. A reference signal transmission method is applied to a first communication device, and is characterized by comprising the following steps:
determining a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal;
dividing the first sequence into a first subsequence and a second subsequence;
mapping the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers does not overlap with resources in the second set of frequency-domain subcarriers.
2. The method of claim 1, wherein the reference signal is transmitted according to a predetermined time interval
Figure FDA0001967732850000011
Wherein k is a frequency domain resource identifier, and f is a functional relation;
Figure FDA0001967732850000012
and μ is a subcarrier spacing configuration parameter of the first communication device, and represents a reference signal transmitted by an antenna port p on the kth subcarrier and the l-th OFDM symbol.
3. The reference signal transmission method according to claim 2,
Figure FDA0001967732850000013
wherein m ═ k-koffsetβ is the power control coefficient, koffsetIs a frequency domain offset, r1(m') is said first sequence, r2(m') is said second sequence, Lseq1Is the length of the first sequence, Lseq2For the length of the second sequence, the first set of frequency domain subcarriers is { k }offset+Lseq2,koffset+Lseq2+1,…,koffset+Lseq1-1} and the second set of frequency-domain subcarriers is { k }offset,koffset+1,…,koffset+Lseq2-1}。
4. The method for transmitting reference signals according to claim 1, wherein the first sequence is generated according to one of the following sequences:
a pseudo-random sequence;
a low PAPR sequence.
5. The method according to claim 1, wherein the length of the first subsequence is greater than or equal to the length of the second subsequence.
6. The method according to claim 4, wherein in the case that the first sequence is a pseudo-random sequence, the initialization value of the pseudo-random sequence is determined according to a packet flag of the first communication device, wherein the packet flag is configured by a network management unit.
7. The method of claim 1, wherein the step of determining the first and second sequences for generating the reference signal comprises:
determining a third sequence from the third set of sequences;
determining the second sequence from the third sequence, the second sequence being a repetition of the third sequence.
8. The reference signal transmission method according to claim 7,
r2(m′)＝r3(m′mod Lseq3)，
wherein r is2(m') is said second sequence, r3(m') is said third sequence, Lseq3Is the length of the third sequence.
9. The reference signal transmission method according to claim 7, wherein all third sequences in the third set of sequences are equal in length;
when the length of the third sequence is 2, the third sequence set is
Figure FDA0001967732850000021
Figure FDA0001967732850000022
Wherein m is1,m2Are both 0 or 1;
when the length of the third sequence is 4, the third sequence set is
Figure FDA0001967732850000023
Figure FDA0001967732850000024
Figure FDA0001967732850000025
Wherein m is1,m2,m3,m4Are both 0 or 1;
when the length of the third sequence is 8, the third sequence set is
Figure FDA0001967732850000026
Figure FDA0001967732850000027
Figure FDA0001967732850000028
Figure FDA0001967732850000029
Figure FDA00019677328500000210
Wherein m is1,m2,m3,m4,m5,m6,m7,m8Are both 0 or 1;
when the length of the third sequence is 12, the third sequence set is:
Figure FDA00019677328500000211
Figure FDA00019677328500000212
Figure FDA00019677328500000213
Figure FDA0001967732850000031
Figure FDA0001967732850000032
Figure FDA0001967732850000033
Figure FDA0001967732850000034
Figure FDA0001967732850000035
Figure FDA0001967732850000036
Figure FDA0001967732850000037
Figure FDA0001967732850000038
wherein m is1,m2,m3,m4,m5,m6,m7,m8,m9,m10,m11,m12Are both 0 or 1.
10. The method for reference signal transmission according to claim 7, wherein the step of determining the third sequence from the third set of sequences comprises:
determining the third sequence from the set of third sequences according to a first parameter, the first parameter comprising at least one of:
a packet flag of the first communication device;
transmitting a time parameter of the reference signal;
and transmitting the antenna port identification of the reference signal.
11. The method of claim 1, wherein the reference signal is used to indicate at least one of:
the first communication device is subject to far-end interference;
a maximum number of uplink OFDM symbols subject to far-end interference in the first communication device;
the phenomenon of atmospheric wave guide exists;
a packet flag of the first communication device.
12. A transmission method of a reference signal is applied to a second communication device, and is characterized by comprising the following steps:
receiving a reference signal sent by a first communication device, wherein the reference signal is obtained by the first communication device by dividing a first sequence used for generating the reference signal into a first subsequence and a second subsequence, mapping the first subsequence to a first frequency-domain subcarrier set of a frequency-domain resource set used for sending the reference signal, and mapping a product of the second subsequence and the second sequence to a second frequency-domain subcarrier set of the frequency-domain resource set, and resources in the first frequency-domain subcarrier set and the second frequency-domain subcarrier set are not overlapped.
13. The method for transmitting reference signals according to claim 12, wherein the step of receiving the reference signals transmitted by the first communication device is followed by further comprising:
acquiring a transmission delay range of the reference signal according to a part of signals corresponding to the first frequency domain subcarrier set in the reference signal;
and acquiring the second sequence adopted by the part of signals corresponding to the second frequency domain subcarrier set according to the transmission delay range.
14. A first communications device, comprising:
a processor configured to determine a first sequence and a second sequence for generating a reference signal and a set of frequency domain resources for transmitting the reference signal; dividing the first sequence into a first subsequence and a second subsequence;
a transceiver configured to map the first subsequence to a first set of frequency-domain subcarriers of the set of frequency-domain resources and map a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, wherein the first set of frequency-domain subcarriers and resources in the second set of frequency-domain subcarriers do not overlap.
15. A second communications device, comprising:
a transceiver configured to receive a reference signal sent by a first communication device, where the reference signal is obtained by the first communication device by dividing a first sequence used for generating the reference signal into a first subsequence and a second subsequence, mapping the first subsequence to a first set of frequency-domain subcarriers of a set of frequency-domain resources for sending the reference signal, and mapping a product of the second subsequence and the second sequence to a second set of frequency-domain subcarriers of the set of frequency-domain resources, where resources in the first set of frequency-domain subcarriers and resources in the second set of frequency-domain subcarriers do not overlap.
16. A communication device 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 steps in the reference signal transmission method according to any one of claims 1 to 13 when executing the computer program.
17. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps in the reference signal transmission method according to any one of claims 1 to 13.
CN201910109997.7A 2019-02-11 2019-02-11 Reference signal transmission method and communication equipment Active CN111555848B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910109997.7A CN111555848B (en) 2019-02-11 2019-02-11 Reference signal transmission method and communication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910109997.7A CN111555848B (en) 2019-02-11 2019-02-11 Reference signal transmission method and communication equipment

Publications (2)

Publication Number Publication Date
CN111555848A true CN111555848A (en) 2020-08-18
CN111555848B CN111555848B (en) 2023-05-09

Family

ID=72003693

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910109997.7A Active CN111555848B (en) 2019-02-11 2019-02-11 Reference signal transmission method and communication equipment

Country Status (1)

Country Link
CN (1) CN111555848B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115473778A (en) * 2021-06-10 2022-12-13 华为技术有限公司 Method and device for sending and receiving reference signal
WO2023143620A1 (en) * 2022-01-30 2023-08-03 华为技术有限公司 Communication method and apparatus, and computer-readable storage medium

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101779400A (en) * 2007-08-14 2010-07-14 高通股份有限公司 Reference signal generation in a wireless communication system
CN102026219A (en) * 2009-09-22 2011-04-20 中兴通讯股份有限公司 Method and corresponding device for generating and transmitting wireless channel measurement reference signal
CN106416343A (en) * 2014-05-23 2017-02-15 华为技术有限公司 Sequence generating method and terminal and base station for sequence generation
CN106717089A (en) * 2015-09-01 2017-05-24 华为技术有限公司 Transmission device, method, and system for reference signal
CN106961317A (en) * 2016-01-11 2017-07-18 中兴通讯股份有限公司 A kind of data transmission method for uplink and device
CN107483166A (en) * 2016-06-08 2017-12-15 上海朗帛通信技术有限公司 A kind of method and apparatus in radio communication
CN108141427A (en) * 2016-03-10 2018-06-08 华为技术有限公司 A kind of reference signal production method and device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101779400A (en) * 2007-08-14 2010-07-14 高通股份有限公司 Reference signal generation in a wireless communication system
CN102026219A (en) * 2009-09-22 2011-04-20 中兴通讯股份有限公司 Method and corresponding device for generating and transmitting wireless channel measurement reference signal
CN106416343A (en) * 2014-05-23 2017-02-15 华为技术有限公司 Sequence generating method and terminal and base station for sequence generation
CN106717089A (en) * 2015-09-01 2017-05-24 华为技术有限公司 Transmission device, method, and system for reference signal
CN106961317A (en) * 2016-01-11 2017-07-18 中兴通讯股份有限公司 A kind of data transmission method for uplink and device
CN108141427A (en) * 2016-03-10 2018-06-08 华为技术有限公司 A kind of reference signal production method and device
CN107483166A (en) * 2016-06-08 2017-12-15 上海朗帛通信技术有限公司 A kind of method and apparatus in radio communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
石荣: "《TD-LTE下行链路侦收中广播信道传输信息的获取》", 《电子信息对抗技术》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115473778A (en) * 2021-06-10 2022-12-13 华为技术有限公司 Method and device for sending and receiving reference signal
WO2023143620A1 (en) * 2022-01-30 2023-08-03 华为技术有限公司 Communication method and apparatus, and computer-readable storage medium

Also Published As

Publication number Publication date
CN111555848B (en) 2023-05-09

Similar Documents

Publication Publication Date Title
EP3618536B1 (en) Base station device, terminal apparatus, communication method, and integrated circuit
EP3618524B1 (en) Base station device, terminal device, communication method, and integrated circuit
KR101691840B1 (en) Apparatus and metheod for receiving a reference signal
CN110679111B (en) Method for transmitting and receiving reference signal in wireless communication system and apparatus therefor
US10743351B2 (en) Method and wireless device for transmitting random-access preamble by means of single-tone method
KR101766707B1 (en) Transmitter, receiver and method for generating synchronisation signals
US8224242B2 (en) Apparatus and method for removing self-interference and relay system for the same
JP5445677B2 (en) Transmitter, receiver, communication system, communication method
US20110098070A1 (en) Method for transmitting physical layer id information
CN103813362A (en) Method and mobile device for joint cell identity detection and cell measurement for an LTE system
CN111555848B (en) Reference signal transmission method and communication equipment
KR101142787B1 (en) Method for transmitting sychronization signal and calculating correlation value thereof in wireless communication system
WO2017217636A1 (en) Method for transmitting and receiving synchronization signal in wireless communication system, and apparatus therefor
CN110932817B (en) Reference signal generation method, far-end interference suppression method and communication equipment
Silva et al. Cell search in long term evolution systems: primary and secondary synchronization
CN101431368A (en) Signal channel estimation method and apparatus
CN110677226B (en) Reference signal sending and receiving method and communication equipment
KR20230001449A (en) Method and apparatus for random access using multi-dimension prach structure in a wireless communication system
CN111049614B (en) Remote interference back-off method and base station
KR20120015851A (en) Apparatus and method of otdoa estimation in mobile communication system
Shimura et al. Performance of physical cell ID detection using PVS based transmit diversity for NB-IoT
KR102155149B1 (en) Method and apparatus for transmitting synchronization signal for device to device communication in wireless communication system
KR20100110733A (en) Apparatus and metheod for positioing a user equipment
Lee et al. A Novel Discovery Channel Scheduling for Inter-Cell Device-to-Device Discovery in 3GPP LTE Asynchronous Network
KR20110019693A (en) Apparautus and method for transmitting signals for positioning a user euqipment in wireless communication system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20231212

Address after: 32 Xuanwumen West Street, Xicheng District, Beijing 100053

Patentee after: CHINA MOBILE COMMUNICATION LTD., Research Institute

Patentee after: CHINA MOBILE COMMUNICATIONS GROUP Co.,Ltd.

Patentee after: China Mobile Zijin (Jiangsu) Innovation Research Institute Co.,Ltd.

Address before: 32 Xuanwumen West Street, Xicheng District, Beijing 100053

Patentee before: CHINA MOBILE COMMUNICATION LTD., Research Institute

Patentee before: CHINA MOBILE COMMUNICATIONS GROUP Co.,Ltd.

TR01 Transfer of patent right