CN109327292B - Downlink reference signal resource allocation method and device - Google Patents

Downlink reference signal resource allocation method and device Download PDF

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CN109327292B
CN109327292B CN201710641218.9A CN201710641218A CN109327292B CN 109327292 B CN109327292 B CN 109327292B CN 201710641218 A CN201710641218 A CN 201710641218A CN 109327292 B CN109327292 B CN 109327292B
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reference signal
downlink
downlink reference
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cell
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CN109327292A (en
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池连刚
潘瑜
龚秋莎
冯绍鹏
吕征南
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Potevio Information Technology Co Ltd
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    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Abstract

In the method, after a network side device (for example, a base station) generates a downlink reference signal sequence, an initial offset and a relative offset are obtained according to a cell identifier of each cell, the number of subcarriers on a subband and an index of a downlink resource OFDM symbol contained in a radio frame. In the first downlink resource OFDM symbol, the subcarrier indicated by the initial offset is allocated to the first element in the sequence, and in the rest downlink resource OFDM symbols, the subcarrier indicated by the relative offset is sequentially allocated to the rest elements of the downlink reference signal sequence, so that the downlink resource is allocated to the downlink reference signal, and the demodulation of a downlink channel is ensured.

Description

Downlink reference signal resource allocation method and device
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a downlink reference signal resource allocation method and device.
Background
The bandwidth of each sub-band of the existing broadband transmission system based on the discrete narrow-band aggregation is 25 kHz. In order to improve the spectrum utilization, as shown in fig. 1, 11 effective subcarriers may be set for each subband, and the subcarrier spacing is 2 kHz. Wherein, one radio frame in each sub-band is composed of 5 sub-frames with the length of 5ms, and each sub-frame is composed of 9 OFDM symbols. The downlink resource is 13 symbols, which are 9 symbols of the subframe 0 and the first 4 symbols of the subframe 1. The downlink resource is mainly used for transmitting PBCH, PDCCH and PDSCH channels.
However, in the process of implementing the embodiment of the present invention, the inventors find that, for a wideband transmission system with discrete narrowband aggregation, a feasible and effective downlink reference signal transmission method has not been proposed for a multi-self-band aggregation operation mode.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method and an apparatus for reasonably allocating downlink reference signal resources.
In a first aspect, an embodiment of the present invention provides a method for allocating downlink reference signal resources, including:
generating a downlink reference signal sequence of each cell, wherein the length of the downlink reference signal sequence is the same as the number of downlink resource OFDM symbols contained in a wireless frame;
acquiring initial offset according to the cell identification of each cell and the number of subcarriers on the sub-band; obtaining a plurality of relative offsets according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset;
in a first downlink resource OFDM symbol, allocating a subcarrier indicated by the initial offset to a first element of a downlink reference signal sequence; and in the rest downlink resource OFDM symbols, sequentially allocating the subcarriers corresponding to the downlink resource OFDM symbols indicated by the relative offsets to the rest elements of the downlink reference signal sequence.
In a second aspect, an embodiment of the present invention further provides a downlink reference signal resource allocation apparatus, including:
a sequence generating unit, configured to generate a downlink reference signal sequence of each cell, where a length of the downlink reference signal sequence is the same as the number of downlink resource OFDM symbols included in one radio frame;
an offset obtaining unit, configured to obtain an initial offset according to a cell identifier of each cell and the number of subcarriers on the subband; obtaining a plurality of relative offsets according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset;
a resource allocation unit, configured to allocate, in a first downlink resource OFDM symbol, a subcarrier indicated by the initial offset to a first element of a downlink reference signal sequence; and in the rest downlink resource OFDM symbols, sequentially allocating the subcarriers corresponding to the downlink resource OFDM symbols indicated by the relative offsets to the rest elements of the downlink reference signal sequence.
In a third aspect, a further embodiment of the present invention provides a base station, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method according to the first aspect when executing the program.
In a fourth aspect, a further embodiment of the invention provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps of the method according to the first aspect.
In the method, after a network side device (for example, a base station) generates a downlink reference signal sequence, an initial offset and a relative offset are obtained according to a cell identifier of each cell, the number of subcarriers on a subband and an index of a downlink resource OFDM symbol contained in a radio frame. In the first downlink resource OFDM symbol, the subcarrier indicated by the initial offset is allocated to the first element in the sequence, and in the rest downlink resource OFDM symbols, the subcarrier indicated by the relative offset is sequentially allocated to the rest elements of the downlink reference signal sequence, so that the downlink resource is allocated to the downlink reference signal, and the demodulation of a downlink channel is ensured.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a diagram of a wireless frame structure of a broadband transmission system based on discrete narrowband aggregation in the prior art
Fig. 2 is a flowchart of a method for allocating downlink reference signal resources according to an embodiment of the present invention;
fig. 3 is a schematic diagram of downlink reference signal resource allocation according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a downlink reference signal resource allocation apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first aspect, an embodiment of the present invention provides a method for allocating downlink reference signal resources, as shown in fig. 1, including:
s101, generating downlink reference signal sequences of each cell, wherein the length of downlink reference signal resource allocation downlink reference signal sequences is the same as the number of downlink resource OFDM symbols contained in a wireless frame;
s102, acquiring initial offset according to the cell identification of each cell and the number of subcarriers on a downlink reference signal resource allocation subband; acquiring a plurality of relative offsets according to the number of subcarriers on a downlink reference signal resource allocation subband, an index of a downlink resource OFDM symbol contained in a wireless frame and an initial offset;
s103, in a first downlink resource OFDM symbol, allocating a subcarrier indicated by a downlink reference signal resource allocation initial offset to a first element of a downlink reference signal sequence; and in the rest downlink resource OFDM symbols, sequentially allocating the subcarriers corresponding to the downlink resource OFDM symbols indicated by the relative offsets to the rest elements of the downlink reference signal sequence.
In the method for allocating downlink reference signal resources provided in the embodiments of the present invention, after a network device (e.g., a base station) generates a downlink reference signal sequence, an initial offset and a relative offset are obtained according to a cell identifier of each cell, the number of subcarriers on a subband, and an index of a downlink resource OFDM symbol included in one radio frame. In the first downlink resource OFDM symbol, the subcarrier indicated by the initial offset is allocated to the first element in the sequence, and in the rest downlink resource OFDM symbols, the subcarrier indicated by the relative offset is sequentially allocated to the rest elements of the downlink reference signal sequence, so that the downlink resource is allocated to the downlink reference signal, and the demodulation of a downlink channel is ensured.
In practical applications, the generation of the downlink reference signal sequence of each cell in step S101 may be implemented in various ways, and an alternative implementation thereof is described below.
Taking the system frame structure shown in fig. 1 as an example, according to the system frame structure shown in fig. 1, the downlink resource of each subband has 13 symbols, so that the length of the downlink reference signal of each subband is 13 PN codes, and the downlink reference signal generated by subband m in each radio frame can be shown in formula (1).
Figure BDA0001365941190000041
Wherein, m is an absolute sub-band number, and the value range is related to the distribution condition of the system frequency band. In a 230M wideband transmission system based on discrete narrowband aggregation, each subband has a bandwidth of 25KHz, and at this time, the subband may be divided into 480 subbands, so that M at this time has a value in a range of 0,1, …, and 479.
And c (n) is a pseudo-random sequence, and the specific sequence generation content will be described in detail below. The pseudo-random sequence generator is initialized once per OFDM symbol with an initial value cinitSee formula (2).
Figure BDA0001365941190000051
Where L is an index of a downlink resource OFDM symbol included in one radio frame, and for the case shown in fig. 1, L is 0, 1. In addition thereto here
Figure BDA0001365941190000052
The cell ID is introduced to avoid mutual interference between cells and ensure that a downlink channel can be demodulated normally.
The generation process of the pseudo random sequence is explained in detail below.
Length MPNIs generated according to the following formula (3):
c(n)＝(x1(n+NC)+x2(n+NC))mod2 (3)
wherein:
(1)n＝0,1,...,MPN-1
(2)NC＝1600
Figure BDA0001365941190000054
first sequence x1(n) should be initialized to x1(0)＝1,x1(n) ═ 0, n ═ 1,2, 30. Second sequence x2(n) according to formula
Figure BDA0001365941190000053
Initialization is performed with values that depend on the specific application of the sequence.
In specific implementation, there are many ways to allocate resources for the downlink reference signal sequence according to the manner described in step S103, where an alternative allocation manner may be as shown in fig. 3. That is, after the allocation is performed in the manner described in step S103, in two adjacent downlink resource OFDM symbols, two subcarriers allocated to an element of the downlink reference signal sequence are adjacent subcarriers, or are the first subcarrier and the last subcarrier on a subband.
For convenience of describing the resource allocation process, in fig. 3, each subcarrier and each downlink OFDM symbol are numbered, indexes for the downlink OFDM symbols are arranged horizontally, indexes for each subcarrier are arranged vertically, and the length of the downlink reference signal sequence is the same as the number of the downlink OFDM symbols, so that the downlink reference signal sequence has the same length as the downlink OFDM symbolsElements in the downlink reference signal sequence are also numbered, element 0 to element 12 respectively. As shown in fig. 3, in OFDM symbol 0, an initial offset vshiftIs four subcarriers, so vshiftThe indicated subcarrier is subcarrier 4, and subcarrier 4 is allocated with element 0 of the downlink reference signal sequence; in OFDM symbol 1, the subcarrier indicated by the relative offset corresponding to OFDM symbol 1 is subcarrier 5, and therefore subcarrier 5 is assigned element 1 of the downlink reference signal sequence; the following allocation process is similar, after the subcarrier 10 is allocated to the element 6 of the downlink reference signal sequence, the allocation is started from the subcarrier 0, the element 7 is allocated, and then the allocation is performed in the above manner, so that the allocation of the downlink resource of the downlink reference signal sequence with the length of 13 is realized.
It can be seen that, the main parameters determining how to perform allocation are the initial offset and the relative offset, and in order to implement the resource allocation shown in fig. 3, one possible implementation manner of obtaining the initial offset and the relative offset in step S102 may be:
according to the cell identification of each cell and the number of subcarriers on a subband, acquiring an initial offset based on the formula (4):
Figure BDA0001365941190000061
wherein v isshiftFor the purpose of the initial offset amount,
Figure BDA0001365941190000062
for each cell's cell identity,
Figure BDA0001365941190000063
the number of sub-carriers on a sub-band;
obtaining a relative offset based on formula (5) according to the number of subcarriers on a subband, an index of a downlink resource OFDM symbol contained in a radio frame and an initial offset:
Figure BDA0001365941190000064
wherein k is a relative offset, and L is an index of a downlink resource OFDM symbol included in one radio frame.
V is obtained according to the formulae (4) and (5)shiftAnd k after, the reference signal sequence r can be divided intoL(m) mapping to complex-valued modulation symbols
Figure BDA0001365941190000065
See formula (6) above for details.
Figure BDA0001365941190000077
Wherein the content of the first and second substances,
m: for the absolute subband numbers, as indicated above, m may range from 0,1, …,479 in the case shown in fig. 3.
Figure BDA0001365941190000071
The number of OFDM symbols contained in one subframe, for the case shown in fig. 3, here
Figure BDA0001365941190000072
May be 9;
Figure BDA0001365941190000073
the number of sub-carriers on a sub-band, for the case shown in fig. 3, here
Figure BDA0001365941190000074
Is 11;
n subf0, 1; the number of the subframe in which downlink resource transmission is performed in one radio frame is represented, that is, subframe 0 and subframe 1.
Therefore, the temperature of the molten metal is controlled,
Figure BDA0001365941190000075
thus, an index of a downlink resource OFDM symbol included in one radio frame is obtained:
Figure BDA0001365941190000076
it can be seen that the formula shown in formula (6) is a mathematical expression of the downlink resource allocation process in step S103, and in this way, a suitable downlink channel resource can be reasonably allocated to the downlink reference signal sequence, so as to ensure demodulation of the downlink channel.
Of course, the distribution shown in fig. 3 and described above is only an optional embodiment, and in practical applications, a distribution similar to that shown in fig. 3 may also be used. Specifically, OFDM symbol 0 is assigned in the same manner, subcarrier 3 is assigned to element 1 in OFDM symbol 1, subcarrier 2 is assigned to element 2 in OFDM symbol 2, and so on. I.e. this is a reverse of fig. 3.
In addition, in a specific implementation, the downlink reference signal may be a downlink reference signal of a PDCCH channel or a downlink reference signal of a PDSCH channel; therefore, the method provided by the embodiment of the present invention may further include: and the downlink reference signal of the PDCCH channel and the downlink reference signal of the PDSCH channel are subjected to time division multiplexing on downlink resources on each sub-band.
For example, 13 downlink OFDM symbols of the first radio frame transmit downlink reference signals of a PDCCH channel, and 13 downlink OFDM symbols of the second radio frame transmit downlink reference signals of a PDSCH channel, so that downlink resources on each subband are time-division multiplexed with the downlink reference signals of the PDCCH channel and the downlink reference signals of the PDSCH channel, and the PDCCH channel and the PDSCH channel are guaranteed not to interfere with each other on the premise of fully utilizing bandwidth resources.
In a second aspect, another embodiment of the present invention provides a downlink reference signal resource allocation apparatus, as shown in fig. 4, including:
a sequence generating unit 201, configured to generate a downlink reference signal sequence of each cell, where a length of the downlink reference signal sequence is the same as the number of downlink resource OFDM symbols included in one radio frame;
an offset obtaining unit 202, configured to obtain an initial offset according to a cell identifier of each cell and the number of subcarriers on the subband; obtaining a plurality of relative offsets according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset;
a resource allocation unit 203, configured to allocate, in a first downlink resource OFDM symbol, a subcarrier indicated by the initial offset to a first element of a downlink reference signal sequence; and in the rest downlink resource OFDM symbols, sequentially allocating the subcarriers corresponding to the downlink resource OFDM symbols indicated by the relative offsets to the rest elements of the downlink reference signal sequence.
Optionally, in two adjacent downlink resource OFDM symbols, two subcarriers allocated to an element of a downlink reference signal sequence are adjacent subcarriers, or a first subcarrier and a last subcarrier on a subband.
Optionally, the offset obtaining unit 202 is further configured to:
and acquiring an initial offset based on the following formula according to the cell identifier of each cell and the number of the subcarriers on the subband:
Figure BDA0001365941190000081
wherein v isshiftFor the purpose of the initial offset amount,
Figure BDA0001365941190000091
for each cell's cell identity,
Figure BDA0001365941190000092
the number of sub-carriers on a sub-band;
obtaining a relative offset according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset based on the following formula:
Figure BDA0001365941190000093
wherein k is a relative offset, and L is an index of a downlink resource OFDM symbol included in one radio frame.
Optionally, the downlink reference signal is a downlink reference signal of a PDCCH channel or a PDSCH channel;
the resource allocation unit 203 is further configured to: and the downlink reference signal of the PDCCH channel and the downlink reference signal of the PDSCH channel are subjected to time division multiplexing on downlink resources on each sub-band.
Since the downlink reference signal resource allocation apparatus described in this embodiment is a device that can execute the downlink reference signal resource allocation method in the embodiment of the present invention, based on the downlink reference signal resource allocation method described in the embodiment of the present invention, those skilled in the art can understand the specific implementation manner of the downlink reference signal resource allocation apparatus of this embodiment and various variations thereof, so that a detailed description of how the downlink reference signal resource allocation apparatus implements the downlink reference signal resource allocation method in the embodiment of the present invention is not described here. As long as a person skilled in the art implements the apparatus used in the method for allocating downlink reference signal resources in the embodiment of the present invention, the apparatus is within the scope of the present application.
Fig. 5 is a block diagram showing a configuration of a computer device according to an embodiment of the present invention.
Referring to fig. 5, the computer apparatus includes: a processor (processor)301, a memory (memory)302, a bus 303, and a bus interface 304;
the processor 301 and the memory 302 complete communication with each other through the bus 303; the bus interface 304 is used for information interaction with external devices.
The processor 301 is configured to call program instructions in the memory 302 to perform the methods provided by the above-mentioned method embodiments, including: the method of the first aspect.
Embodiments of the present invention also disclose a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including: the method of the first aspect.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the foregoing method embodiments, for example, the method includes: the method of the first aspect.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Some component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components of a gateway, proxy server, system according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

Claims (8)

1. A method for allocating downlink reference signal resources is characterized by comprising the following steps:
generating a downlink reference signal sequence of each cell, wherein the length of the downlink reference signal sequence is the same as the number of downlink resource OFDM symbols contained in a wireless frame;
acquiring initial offset according to the cell identification of each cell and the number of subcarriers on a downlink reference signal resource allocation subband; obtaining a plurality of relative offsets according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset;
in a first downlink resource OFDM symbol, allocating a subcarrier indicated by the initial offset to a first element of a downlink reference signal sequence; in the rest downlink resource OFDM symbols, sequentially allocating subcarriers corresponding to each downlink resource OFDM symbol indicated by a plurality of relative offsets to the rest elements of the downlink reference signal sequence;
acquiring initial offset according to the cell identification of each cell and the number of subcarriers on a downlink reference signal resource allocation subband; obtaining a plurality of relative offsets according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset, including:
and acquiring an initial offset based on the following formula according to the cell identifier of each cell and the number of the subcarriers on the subband:
Figure FDA0003027703510000011
wherein v isshiftFor the purpose of the initial offset amount,
Figure FDA0003027703510000012
for each cell's cell identity,
Figure FDA0003027703510000013
the number of sub-carriers on a sub-band;
obtaining a relative offset according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset based on the following formula:
Figure FDA0003027703510000014
wherein k is a relative offset, and L is an index of a downlink resource OFDM symbol included in one radio frame.
2. The method of claim 1, wherein in two adjacent downlink resource OFDM symbols, the two subcarriers allocated for the elements of the downlink reference signal sequence are adjacent subcarriers or a first subcarrier and a last subcarrier on a subband.
3. The method of claim 1, wherein the downlink reference signal is a downlink reference signal of a PDCCH channel or a PDSCH channel;
the method also comprises the step that the downlink reference signal of the PDCCH channel and the downlink reference signal of the PDSCH channel are subjected to time division multiplexing on the downlink resource on each sub-band.
4. A downlink reference signal resource allocation apparatus, comprising:
a sequence generating unit, configured to generate a downlink reference signal sequence of each cell, where a length of the downlink reference signal sequence is the same as the number of downlink resource OFDM symbols included in one radio frame;
an offset obtaining unit, configured to obtain an initial offset according to a cell identifier of each cell and the number of subcarriers on a downlink reference signal resource allocation subband; obtaining a plurality of relative offsets according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset;
a resource allocation unit, configured to allocate, in a first downlink resource OFDM symbol, a subcarrier indicated by the initial offset to a first element of a downlink reference signal sequence; in the rest downlink resource OFDM symbols, sequentially allocating subcarriers corresponding to each downlink resource OFDM symbol indicated by a plurality of relative offsets to the rest elements of the downlink reference signal sequence;
the offset obtaining unit is further configured to:
and acquiring an initial offset based on the following formula according to the cell identifier of each cell and the number of the subcarriers on the subband:
Figure FDA0003027703510000021
wherein v isshiftFor the purpose of the initial offset amount,
Figure FDA0003027703510000022
for each cell's cell identity,
Figure FDA0003027703510000023
the number of sub-carriers on a sub-band;
obtaining a relative offset according to the number of the sub-carriers on the sub-band, the index of the downlink resource OFDM symbol contained in one wireless frame and the initial offset based on the following formula:
Figure FDA0003027703510000031
wherein k is a relative offset, and L is an index of a downlink resource OFDM symbol included in one radio frame.
5. The apparatus of claim 4, wherein in two adjacent downlink resource OFDM symbols, the two subcarriers allocated for the elements of the downlink reference signal sequence are adjacent subcarriers or a first subcarrier and a last subcarrier on a subband.
6. The apparatus of claim 4, wherein the downlink reference signal is a downlink reference signal of a PDCCH channel or a PDSCH channel;
the resource allocation unit is further configured to: and the downlink reference signal of the PDCCH channel and the downlink reference signal of the PDSCH channel are subjected to time division multiplexing on downlink resources on each sub-band.
7. 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 steps of the method according to any of claims 1 to 3 when executing the program.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
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