CN106921479B - Channel estimation method, sending end equipment and receiving end equipment - Google Patents
Channel estimation method, sending end equipment and receiving end equipment Download PDFInfo
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- CN106921479B CN106921479B CN201511006101.0A CN201511006101A CN106921479B CN 106921479 B CN106921479 B CN 106921479B CN 201511006101 A CN201511006101 A CN 201511006101A CN 106921479 B CN106921479 B CN 106921479B
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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
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
Abstract
The embodiment of the invention provides a channel estimation method, which comprises the steps of generating a subframe, wherein the subframe comprises a plurality of resource block pairs, and two resource blocks contained in each resource block pair are borne by the same group of continuous subcarriers and belong to different time slots respectively; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe; and transmitting the sub-frame. In the technical solution provided in the embodiment of the present invention, the number of the demodulation resource granule groups carrying the demodulation reference signal of the same active antenna port within a plurality of resource block pairs of each subframe can be set according to the number of the active antenna ports associated with each subframe, so that the allocation of the demodulation reference signal carrying resources is more flexible.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a channel estimation method, a transmitting end device, and a receiving end device.
Background
The advent of MIMO (Multi-input Multi-output) technology has greatly improved the data transmission rate of wireless communication systems, and is therefore gradually adopted by more and more wireless communication standards, such as LTE (Long-Term Evolution). The latest LTE standard supports up to 8 Antenna ports (Antenna ports), and a receiving end performs channel estimation on each Antenna Port by using a Demodulation Reference Signal (DMRS) corresponding to the Antenna Port.
In the latest LTE standard, the bearer resources of the demodulation reference signal are allocated in a fixed and unchangeable manner, so the resource allocation manner is not flexible enough.
Disclosure of Invention
In view of the foregoing, there is a need for a channel estimation method that can achieve flexible allocation of demodulation reference signal bearing resources.
Meanwhile, the sending terminal equipment is provided, and flexible allocation of demodulation reference signal bearing resources can be realized.
Meanwhile, the receiving end equipment is provided, and flexible allocation of demodulation reference signal bearing resources can be realized.
According to a first aspect of the embodiments of the present invention, there is provided a channel estimation method, including:
generating a subframe, wherein the subframe comprises a plurality of resource block pairs, and two resource blocks contained in each resource block pair are carried by the same group of continuous subcarriers and belong to different time slots; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
and transmitting the subframe.
In a first implementable manner of the first aspect, within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the first aspect or the first implementable manner of the first aspect, in a second implementable manner of the first aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
According to the first aspect, the first implementable manner of the first aspect, or the second implementable manner of the first aspect, in a third implementable manner of the first aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the first aspect, the first implementable manner of the first aspect, the second implementable manner of the first aspect, or the third implementable manner of the first aspect, in a fourth implementable manner of the first aspect, each resource block pair includes 6 demodulation resource granule groups, and each demodulation resource granule group includes 4 resource granules.
In a fifth implementation manner of the first aspect, within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
According to a second aspect of the embodiments of the present invention, there is provided a channel estimation method, including:
receiving a subframe, wherein the subframe comprises a plurality of resource block pairs, and two resource blocks contained in each resource block pair are carried by the same group of continuous subcarriers and belong to different time slots; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource particle group bears demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of demodulation resource particle groups bearing the demodulation reference signals of the same active antenna port is associated with the number of active antenna ports associated with the subframe;
and for each active antenna port, performing channel estimation on the active antenna port according to the demodulation reference signal corresponding to the active antenna port carried in the subframe.
In a first implementable manner of the second aspect, within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the second aspect or the first implementable manner of the second aspect, in a second implementable manner of the second aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
According to the second aspect, the first implementable manner of the second aspect, or the second implementable manner of the second aspect, in a third implementable manner of the second aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the second aspect, the first implementable manner of the second aspect, the second implementable manner of the second aspect, or the third implementable manner of the second aspect, in a fourth implementable manner of the second aspect, each resource block pair includes 6 demodulation resource granule groups, and each demodulation resource granule group includes 4 resource granules.
In a fifth implementable manner of the second aspect, within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
According to a third aspect of the embodiments of the present invention, there is provided a sending end device, including:
the generating module is used for generating a subframe which comprises a plurality of resource block pairs, and two resource blocks contained in each resource block pair are carried by the same group of continuous subcarriers and belong to different time slots respectively; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource particle group bears demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
and the sending module is used for sending the subframe.
In a first implementable manner of the third aspect, in each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the third aspect or the first implementable manner of the third aspect, in a second implementable manner of the third aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
According to the third aspect, the first implementable manner of the third aspect, or the second implementable manner of the third aspect, in a third implementable manner of the third aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the third aspect, the first implementable manner of the third aspect, the second implementable manner of the third aspect, or the third implementable manner of the third aspect, in a fourth implementable manner of the third aspect, each resource block pair includes 6 demodulation resource granule groups, and each demodulation resource granule group includes 4 resource granules.
In a fifth implementable manner of the third aspect, within each resource block pair, the number of demodulation resource particle groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
According to a fourth aspect of the embodiments of the present invention, there is provided a receiving end device, including:
a receiving module, configured to receive a subframe, where the subframe includes a plurality of resource block pairs, and two resource blocks included in each resource block pair are carried by the same group of consecutive subcarriers and belong to different time slots; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource particle group bears demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
and the channel estimation module is used for carrying out channel estimation on each active antenna port according to the demodulation reference signal corresponding to the active antenna port carried in the subframe.
In a first implementable manner of the fourth aspect, within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the fourth aspect or the first implementable manner of the fourth aspect, in a second implementable manner of the fourth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
According to the fourth aspect, the first implementable manner of the fourth aspect, or the second implementable manner of the fourth aspect, in a third implementable manner of the fourth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the fourth aspect, the first implementable manner of the fourth aspect, the second implementable manner of the fourth aspect, or the third implementable manner of the fourth aspect, in a fourth implementable manner of the fourth aspect, each resource block pair includes 6 demodulation resource granule groups, and each demodulation resource granule group includes 4 resource granules.
In a fifth implementable manner of the fourth aspect, within each resource block pair, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
According to a fifth aspect of the embodiments of the present invention, there is provided a channel estimation method, including:
generating a subframe, wherein the subframe comprises a plurality of resource units, each resource unit is carried by a group of continuous or discontinuous subcarriers and is carried on a group of continuous or discontinuous symbols; the resource unit comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a single or a plurality of active antenna ports; in each resource unit, the number of the demodulation resource granule groups bearing the demodulation reference signals of the same active antenna port is related to the number of the active antenna ports related to the subframe;
and transmitting the subframe.
In a first implementable manner of the fifth aspect, in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the fifth aspect or the first implementable manner of the fifth aspect, in a second implementable manner of the fifth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12 in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
According to the fifth aspect, the first implementable manner of the fifth aspect, or the second implementable manner of the fifth aspect, in a third implementable manner of the fifth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the fifth aspect, the first implementable manner of the fifth aspect, the second implementable manner of the fifth aspect, or the third implementable manner of the fifth aspect, in a fourth implementable manner of the fifth aspect, each resource unit contains 6 demodulation resource granule groups, and each demodulation resource granule group contains 4 resource granules.
In a fifth implementable manner of the fifth aspect, in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
According to a sixth aspect of the embodiments of the present invention, there is provided a channel estimation method, including:
receiving a subframe, wherein the subframe comprises a plurality of resource units, each resource unit is carried by a group of continuous or discontinuous subcarriers and is carried on a group of continuous or discontinuous symbols; the resource unit comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a single or a plurality of active antenna ports; in each resource unit, the number of the demodulation resource granule groups bearing the demodulation reference signals of the same active antenna port is related to the number of the active antenna ports related to the subframe;
and for each active antenna port, performing channel estimation on the active antenna port according to the demodulation reference signal corresponding to the active antenna port carried in the subframe.
In a first implementable manner of the sixth aspect, in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the sixth aspect or the first implementable manner of the sixth aspect, in a second implementable manner of the sixth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12 in each resource unit, the number of demodulation resource particle groups carrying demodulation reference signals of the same active antenna port is 2.
According to the sixth aspect, the first implementable manner of the sixth aspect, or the second implementable manner of the sixth aspect, in a third implementable manner of the sixth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the sixth aspect, the first implementable manner of the sixth aspect, the second implementable manner of the sixth aspect, or the third implementable manner of the sixth aspect, in a fourth implementable manner of the sixth aspect, each resource unit contains 6 demod resource particle groups, and each demod resource particle group contains 4 resource particles.
In a fifth implementable manner of the sixth aspect, in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
According to a seventh aspect of the embodiments of the present invention, there is provided a sending end device, including:
a generating module, configured to generate a subframe, where the subframe includes multiple resource units, and each resource unit is carried by a group of consecutive or non-consecutive subcarriers and is carried on a group of consecutive or non-consecutive symbols; the resource unit comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a single or a plurality of active antenna ports; in each resource unit, the number of the demodulation resource granule groups bearing the demodulation reference signals of the same active antenna port is related to the number of the active antenna ports related to the subframe;
and the sending module is used for sending the subframe.
In a first implementable manner of the seventh aspect, in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the seventh aspect or the first implementable manner of the seventh aspect, in a second implementable manner of the seventh aspect, in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
According to the seventh aspect, the first implementable manner of the seventh aspect, or the second implementable manner of the seventh aspect, in a third implementable manner of the seventh aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the seventh aspect, the first implementable manner of the seventh aspect, the second implementable manner of the seventh aspect, or the third implementable manner of the seventh aspect, in a fourth implementable manner of the seventh aspect, each resource unit contains 6 demodulation resource granule groups, and each demodulation resource granule group contains 4 resource granules.
In a fifth implementation manner of the seventh aspect, in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
According to an eighth aspect of the embodiments of the present invention, there is provided a receiving end device, including:
a receiving module, configured to receive a subframe, where the subframe includes multiple resource units, and each resource unit is carried by a group of consecutive or non-consecutive subcarriers and is carried on a group of consecutive or non-consecutive symbols; the resource unit comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a single or a plurality of active antenna ports; in each resource unit, the number of the demodulation resource granule groups bearing the demodulation reference signals of the same active antenna port is related to the number of the active antenna ports related to the subframe;
and the channel estimation module is used for carrying out channel estimation on each active antenna port according to the demodulation reference signal corresponding to the active antenna port carried in the subframe.
In a first implementable manner of the eighth aspect, in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
According to the eighth aspect or the first implementable manner of the eighth aspect, in a second implementable manner of the eighth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12 in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
According to the eighth aspect, the first implementable manner of the eighth aspect, or the second implementable manner of the eighth aspect, in a third implementable manner of the eighth aspect, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8 in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
According to the eighth aspect, the first implementable manner of the eighth aspect, the second implementable manner of the eighth aspect, or the third implementable manner of the eighth aspect, in a fourth implementable manner of the eighth aspect, each resource unit includes 6 demodulation resource granule groups, and each demodulation resource granule group includes 4 resource granules.
In a fifth implementable manner of the eighth aspect, in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
In the technical solution provided in the embodiment of the present invention, the number of the demodulation resource granule groups carrying the demodulation reference signal of the same active antenna port in a plurality of resource block pairs of each subframe may be set according to the number of the active antenna ports associated with each subframe. Therefore, the technical scheme provided by the embodiment of the invention enables the allocation of the demodulation reference signal bearing resources to be more flexible.
Drawings
Fig. 1 is a schematic diagram of a logical structure of a resource block pair according to an embodiment of the present invention;
FIG. 2 is a flow chart of a channel estimation method according to an embodiment of the invention;
FIG. 3 is a diagram illustrating a distribution pattern of demodulation resource granule groups according to an embodiment of the invention;
FIG. 4 is a diagram illustrating a distribution pattern of demodulation resource bin sets according to another embodiment of the present invention;
FIG. 5 is a diagram illustrating a distribution pattern of demodulation resource bin sets according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a logical structure of a transmitting end device according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a logical structure of a receiving end device according to an embodiment of the present invention;
fig. 8 is a schematic hardware configuration of a communication device according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a logical structure of a resource unit according to an embodiment of the present invention.
Detailed Description
Generally, the number of antenna ports used per data transmission (e.g., transmission per Subframe) may be lower than the maximum number of antenna ports supported by the wireless communication standard, in other words, some antenna ports may not be used during each data transmission. For example, although the latest LTE standard supports up to 8 antenna ports, the number of antenna ports used per data transmission may be lower than 8. For convenience of description, the antenna port actually used during each data transmission is referred to as an active antenna port.
To clearly describe the technical solution of the embodiment of the present invention, first, the structure of a resource block pair is described below.
Fig. 1 is a schematic diagram of a logical structure of a resource block pair 100 according to an embodiment of the present invention. The Resource Block (RB) pair 100 is located within a subframe (not shown), and the subframe contains other Resource Block pairs (not shown) in addition to the Resource Block pair 100 shown in fig. 1. The resource block pair 100 shown in fig. 1 includes a resource block 102 and a resource block 104. Resource block 102 and resource block 104 are carried in the frequency domain by the same set of consecutive subcarriers (subcarriers), which includes 12 subcarriers. Furthermore, the resource blocks 102 and 104 belong to different slots (slots), i.e. the resource block 102 belongs to Slot 1 and the resource block 104 belongs to Slot 2. Each slot contains 7 symbols (symbols) in the time domain. The smallest Resource unit in this Resource block pair 100 is a Resource Element (RE), such as Resource Element 106, where each Resource Element is carried by one subcarrier in the frequency domain and one symbol in the time domain. As such, each of resource block 102 and resource block 104 includes 84(12 × 7) resource elements, and resource block pair 100 includes 168 resource elements.
It should be noted that, for convenience of description, the structure of the resource block pair 100 shown in fig. 1 adopts the structure of the resource block pair in the current LTE subframe. However, those skilled in the art will appreciate that the resource block pairs in the LTE sub-frame may have other configurations, and thus the resource block pair 100 may have other configurations. In addition, it should be understood by those skilled in the art that the structure of the resource block pair in the subframe defined in the embodiment of the present invention is not limited to the structure defined in the current LTE standard, and other structures may also be defined according to specific needs, for example, the number of subcarriers in the same set of consecutive subcarriers in the subframe resource block pair and the number of symbols included in each slot may be set according to specific needs, or the resource block pair may be changed into other structures.
In the resource block pair 100, a plurality of resource elements are used to carry the demodulation reference signal, and such resource elements for carrying the demodulation reference signal are usually organized in units of resource element groups, each of which contains a plurality of resource elements. For convenience of description, the above resource granule group carrying the demodulation reference signal is referred to as a demodulation resource granule group. The number of intra-pair demodulation resource granule groups by a resource block is described in detail below with reference to fig. 2.
Fig. 2 is a flow chart of a method 200 of channel estimation in accordance with an embodiment of the present invention.
In step 204, the sending end device sends the subframe to the receiving end.
In step 206, the receiving end device receives the subframe.
In the technical solution provided in the embodiment of the present invention, the number of the demodulation resource granule groups carrying the demodulation reference signal of the same active antenna port in a plurality of resource block pairs of each subframe may be set according to the number of the active antenna ports associated with each subframe. Therefore, the technical scheme provided by the embodiment of the invention enables the resource allocation of the demodulation reference signal to be more flexible.
Specifically, within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1. In this case, the distribution pattern of the demodulation resource granule groups within the resource block pairs may be as shown in fig. 3.
In the distribution pattern 300 shown in FIG. 3, the resource elements represented by the padding patterns 302-312 are used to carry the DM-RS, so there are 24 resource elements used to carry the DM-RS. Meanwhile, the resource elements represented by the same padding pattern form a demodulation resource element group, so the distribution pattern 300 shown in fig. 3 includes 6 demodulation resource element groups in total, and each resource element carrying the demodulation reference signal belongs to only one demodulation resource element group. Each demodulation resource granule group can carry demodulation reference signals of a plurality of active antenna ports in a Code Division Multiplexing (CDM) mode. In the distribution pattern 300 shown in fig. 3, within each resource block pair, the demodulation reference signal of each active antenna port is carried by only one demodulation resource granule group, but each demodulation resource granule group carries the demodulation reference signals corresponding to 4 active antenna ports at most.
It should be noted that the lower limit 13 and the upper limit 24 of the number of active antenna ports associated with the subframe, and the number 1 of demodulation resource element groups carrying demodulation reference signals of the same active antenna port, may be modified to a first value, a second value, and a third value according to specific needs.
In addition, within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2. In this case, the distribution pattern of the demodulation resource element groups within the resource block pairs may be as shown in fig. 4.
In the distribution pattern 400 shown in FIG. 4, the resource elements represented by the padding patterns 402-406 are used to carry the DM-RS, so there are 24 resource elements used to carry the DM-RS. Meanwhile, the resource elements carried by the same subcarrier and represented by the same padding pattern constitute a demodulation resource element group, so the distribution pattern 400 shown in fig. 4 includes 6 demodulation resource element groups in total, and each resource element carrying the demodulation reference signal belongs to only one demodulation resource element group. Each demodulation resource granule group can carry demodulation reference signals of a plurality of active antenna ports in a code division multiplexing mode. In the distribution pattern 400 shown in fig. 4, within each resource block pair, the demodulation reference signal for each active antenna port is carried by two demodulation resource granule groups, the resource granules in the two demodulation resource granule groups being represented by the same padding pattern. In addition, each demodulation resource granule group carries demodulation reference signals corresponding to 4 active antenna ports at most.
It should be noted that the lower limit 9 and the upper limit 12 of the number of active antenna ports associated with the subframe, and the number 2 of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port, may be modified to a fourth value, a fifth value, and a sixth value according to specific needs.
In addition, in each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
In the distribution pattern 500 shown in FIG. 5, the resource elements represented by the filling patterns 502-504 are used to carry the demodulation reference signals, so that there are 24 resource elements used to carry the demodulation reference signals. Meanwhile, the resource elements carried by the same subcarrier and represented by the same padding pattern constitute a demodulation resource element group, so the distribution pattern 500 shown in fig. 5 includes 6 demodulation resource element groups in total, and each resource element carrying the demodulation reference signal belongs to only one demodulation resource element group. Each demodulation resource granule group can carry demodulation reference signals of a plurality of active antenna ports in a code division multiplexing mode. In the distribution pattern 500 shown in fig. 5, within each resource block pair, the demodulation reference signal for each active antenna port is carried by three demodulation resource granule groups, the resource granules in the three demodulation resource granule groups being represented by the same padding pattern. In addition, each demodulation resource granule group carries demodulation reference signals corresponding to 4 active antenna ports at most.
It should be noted that the lower limit 1 and the upper limit 8 of the number of active antenna ports associated with the subframe, and the number 3 of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port, may be modified to the seventh value and the eighth value, and the ninth value according to specific needs.
It should be noted that, in the implementation process, the positions of the resource elements in the demodulation resource element group carrying the demodulation reference signal in the resource block pair are not limited to the positions shown in fig. 3 to 5. In other words, the positions of the resource elements in the demodulation resource element group carrying the demodulation reference signal within the resource block pair can be set according to specific needs. In addition, in the specific implementation process, the Code division multiplexing can be implemented by using Orthogonal Cover Code (OCC), and the length of the Orthogonal Cover Code is related to the number of resource elements in each demodulation resource element group. For example, in the distribution patterns 300-500 shown in fig. 3-5, code division multiplexing can be implemented using orthogonal cover codes of length 4. Meanwhile, the process of loading the demodulation reference signals of the active antenna ports on each resource particle in the demodulation resource particle group, and the process of loading the demodulation reference signals of a plurality of active antenna ports on the same demodulation resource particle group in a code division multiple access manner by means of orthogonal cover codes have already been clearly described in the prior art (for example, LTE related standards), and therefore, no further description is given here.
As can be seen from the distribution patterns 300 to 500 shown in fig. 3 to 5, in a specific implementation process, each resource block pair may include 6 demodulation resource granule groups, and each demodulation resource granule group may include 4 resource granules. In addition, as can be seen from the distribution patterns 300 to 500 shown in fig. 3 to 5, in each resource block pair, the number of demodulation resource element groups carrying demodulation reference signals of the same active antenna port decreases as the number of active antenna ports associated with the subframe increases, and increases as the number of active antenna ports associated with the subframe decreases.
With the introduction of a large-scale array antenna, a beam formed at the base station side becomes narrow, energy is more concentrated, interference among users becomes small, the number of multipaths is reduced, the degree of frequency selective fading is reduced due to the above change, and the relatively flat frequency selective fading creates a foundation for sparseness processing of demodulation reference signals on a frequency domain, that is, the number of subcarriers occupied by resource particles in a demodulation resource particle group is smaller, and the intervals among the occupied subcarriers are larger. Based on the above analysis, the number of resource elements or demodulation resource element groups occupied by the demodulation reference signal in the resource block pair can be reduced appropriately, and a higher number of active antenna ports is supported.
On the other hand, when the channel environment becomes poor, the number of active antenna ports decreases. In this case, more resource elements or demodulation resource element groups may be allocated to the demodulation reference signal corresponding to each active antenna port, so as to improve the accuracy of channel estimation.
Fig. 6 is a schematic diagram of a logical structure of a transmitting-end device 600 according to an embodiment of the present invention. In a specific implementation process, the sending-end device 600 may be a base station or a user terminal. The transmitting end device 600 includes a generating module 602 and a transmitting module 604.
The generating module 602 is configured to generate a subframe, where the subframe includes a plurality of resource block pairs, and two resource blocks included in each resource block pair are carried by the same group of consecutive subcarriers and belong to different time slots; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
the sending module 604 is configured to send the subframe.
Fig. 7 is a schematic diagram of a logical structure of a receiving end device 700 according to an embodiment of the present invention. In a specific implementation process, the receiving end device 700 may be a user terminal or a base station. The receiving end device includes an acceptance module 702 and a channel estimation module 704.
The receiving module 702 is configured to receive a subframe, where the subframe includes a plurality of resource block pairs, and two resource blocks included in each resource block pair are carried by the same group of consecutive subcarriers and belong to different time slots; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
the channel estimation module 704 is configured to perform channel estimation on each active antenna port according to a demodulation reference signal corresponding to the active antenna port carried in the subframe.
The transmitting-end device 600 and the receiving-end device 700 cooperate with each other to perform the channel estimation method 200. The relevant technical features of the above modules involved in the above operation process have been described in detail above in conjunction with the channel estimation method 200, and therefore are not described again here.
Fig. 8 is a hardware configuration diagram of a communication device 800 according to an embodiment of the invention. The communication device 800 may be a sending end device as described above and may be a receiving end device as described above. The communication device 800 includes a processor 802, a memory 804, a transceiver 806, an input/output interface 808, and a bus 810, wherein the processor 802, the memory 804, the transceiver 806, and the input/output interface 808 are communicatively coupled to each other via the bus 810.
The processor 802 is configured to read the control instructions stored in the memory 804 to perform the operations performed by the generating module 602 in the sending-end device 600 and the operations performed by the channel estimation module 704 in the receiving-end device 700. The transceiver 806 is used for cooperating with the processor 802 to perform the operations performed by the sending module 604 in the sending-end device 600 and the operations performed by the receiving module 702 in the receiving-end device 700.
It should be noted that the subframes may have other structures. For example, in a specific implementation process, the resource block pair may be simplified into a single format, i.e., a resource unit. The resource elements are carried by a set of contiguous or non-contiguous subcarriers and are carried over a set of contiguous or non-contiguous symbols. The resource unit comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a single or a plurality of active antenna ports; within each resource unit, the number of demodulation resource element groups carrying demodulation reference signals of the same active antenna port is associated with the number of active antenna ports associated with the subframe. A schematic diagram of the logical structure of the resource unit is shown in fig. 9.
Fig. 9 is a schematic diagram of a logical structure of a resource unit 900 according to an embodiment of the present invention. The resource unit 900 is located in a subframe (not shown), and the subframe contains other resource units (not shown) in addition to the resource unit 900 shown in fig. 9. The resource unit 900 shown in fig. 9 is carried by the same group of consecutive subcarriers in the frequency domain, and the group of subcarriers includes M subcarriers. In addition, the resource unit 900 shown in fig. 9 is carried on a set of consecutive symbols in the time domain, and the set of symbols includes N symbols. The smallest resource unit in resource unit 900 is still a resource element, such as resource element 902, each resource element being carried by one subcarrier in the frequency domain and one symbol in the time domain. As such, the resource unit 900 includes M × N resource elements.
It should be noted that although the resource unit 900 shown in fig. 9 is carried by the same set of consecutive subcarriers in the frequency domain and carried on a set of consecutive symbols in the time domain, the present invention is not limited thereto. In fact, the resource elements may also be carried by a non-contiguous set of subcarriers and over a non-contiguous set of symbols. Furthermore, a group of subcarriers carrying the resource element may be continuous or discontinuous, and a group of symbols carrying the resource element may be continuous or discontinuous.
Thus, the subframe can adopt the following structure: the subframe includes a plurality of resource elements, each resource element being carried by a set of contiguous or non-contiguous subcarriers and being carried on a set of contiguous or non-contiguous symbols. The resource unit comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a single or a plurality of active antenna ports; in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is associated with the number of active antenna ports associated with the subframe.
Furthermore, based on the above subframe structure:
in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1. Similarly, the lower limit 13 and the upper limit 24 of the number of active antenna ports associated with the subframe, and the number 1 of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port, may be modified to a first value, a second value, and a third value according to specific needs.
Furthermore, based on the above subframe structure:
in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2. Similarly, the lower limit 9 and the upper limit 12 of the number of active antenna ports associated with the subframe, and the number 2 of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port, may be modified to a fourth value, a fifth value, and a sixth value according to specific needs.
Furthermore, based on the above subframe structure:
in each resource unit, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3. Similarly, the lower limit 1 and the upper limit 8 of the number of active antenna ports associated with the subframe, and the number 3 of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port may be modified to a seventh value, an eighth value, and a ninth value according to specific needs.
Meanwhile, based on the subframe structure, each resource unit may include 6 demodulation resource granule groups, and each demodulation resource granule group may include 4 resource granules.
In addition, in each resource unit, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port decreases with the increase of the number of active antenna ports associated with the subframe, and increases with the decrease of the number of active antenna ports associated with the subframe.
Meanwhile, in the specific implementation process, the positions of the resource particles in the demodulation resource particle group carrying the demodulation reference signal in the resource unit can be set according to the specific needs. Meanwhile, Code division multiplexing may be implemented using Orthogonal Cover Code (OCC) to carry demodulation reference signals of multiple active antenna ports on each demodulation resource bin. The length of the orthogonal cover code is related to the number of resource elements in each demodulation resource element group. Meanwhile, the process of loading the demodulation reference signals of the active antenna ports on each resource particle in the demodulation resource particle group, and the process of loading the demodulation reference signals of a plurality of active antenna ports on the same demodulation resource particle group in a code division multiple access manner by means of orthogonal cover codes have already been clearly described in the prior art (for example, LTE related standards), and therefore, no further description is given here.
It should be noted that, although the subframe structure is different, the channel estimation method based on the subframe of the structure can still be implemented with reference to the above-described processing procedure, for example, by replacing the subframe involved in the channel estimation method 200 with the subframe of other structure (e.g., the subframe designed based on the resource unit) to obtain the channel estimation method based on the replaced subframe. Similarly, although the subframe structures are different, the transmitting end device, the receiving end device, and the communication device based on the subframes with the structures may still be implemented by referring to the corresponding devices described above, for example, replacing the subframes involved in the transmitting end device 600, the receiving end device 700, and the communication device 800 with subframes with other structures, so as to obtain the transmitting end device, the receiving end device, and the communication device based on the replaced subframes.
Further, it should be noted that, although the subframe structures are different, the same named features, e.g., demodulation resource granule groups, in subframes of different structures may have the same meaning.
It will be apparent to those skilled in the art that all or part of the steps of the above method may be performed by hardware associated with program instructions, and the program may be stored in a computer readable storage medium such as ROM, RAM, optical disk, etc.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (20)
1. A method of channel estimation, comprising:
generating a subframe, wherein the subframe comprises a plurality of resource block pairs, and two resource blocks contained in each resource block pair are carried by the same group of continuous subcarriers and belong to different time slots; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
and transmitting the subframe.
2. The method of claim 1, wherein within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource bin groups carrying demodulation reference signals for the same active antenna port is 1.
3. The method of claim 1, wherein within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 2.
4. The method of claim 1, wherein within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
5. The method of any one of claims 1 to 4, wherein each resource block pair comprises 6 demodulation resource granule groups, each demodulation resource granule group comprising 4 resource granules.
6. A method of channel estimation, comprising:
receiving a subframe, wherein the subframe comprises a plurality of resource block pairs, and two resource blocks contained in each resource block pair are carried by the same group of continuous subcarriers and belong to different time slots; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
and for each active antenna port, performing channel estimation on the active antenna port according to the demodulation reference signal corresponding to the active antenna port carried in the subframe.
7. The method of claim 6, wherein within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 1.
8. The method of claim 6, wherein within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12, then the number of demodulation resource bin groups carrying demodulation reference signals for the same active antenna port is 2.
9. The method of claim 6, wherein within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8, the number of demodulation resource granule groups carrying demodulation reference signals of the same active antenna port is 3.
10. The method of any one of claims 6 to 9, wherein each resource block pair comprises 6 demodulation resource granule groups, each demodulation resource granule group comprising 4 resource granules.
11. A transmitting-end device, characterized by comprising:
the generating module is used for generating a subframe which comprises a plurality of resource block pairs, and two resource blocks contained in each resource block pair are carried by the same group of continuous subcarriers and belong to different time slots respectively; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource particle group bears demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of demodulation resource particle groups bearing the demodulation reference signals of the same active antenna port is associated with the number of active antenna ports associated with the subframe;
and the sending module is used for sending the subframe.
12. The apparatus of claim 11, wherein within each resource block pair, if a number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, a number of demodulation resource granule groups carrying demodulation reference signals for the same active antenna port is 1.
13. The apparatus of claim 11, wherein within each resource block pair, if a number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12, a number of demodulation resource granule groups carrying demodulation reference signals for the same active antenna port is 2.
14. The apparatus of claim 11, wherein within each resource block pair, if the number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8, the number of demodulation resource granule groups carrying demodulation reference signals for the same active antenna port is 3.
15. The apparatus of any one of claims 11-14, wherein each resource block pair comprises 6 demodulation resource granule groups, each demodulation resource granule group comprising 4 resource granules.
16. A receiving-end device, comprising:
a receiving module, configured to receive a subframe, where the subframe includes multiple resource block pairs, and two resource blocks included in each resource block pair are carried by the same group of consecutive subcarriers and belong to different time slots respectively; each resource block pair comprises a plurality of demodulation resource granule groups, and each demodulation resource granule group comprises a plurality of resource granules; each demodulation resource granule group carries demodulation reference signals of a plurality of active antenna ports; in each resource block pair, the number of the demodulation resource grain groups carrying the demodulation reference signals of the same active antenna port is associated with the number of the active antenna ports associated with the subframe;
and the channel estimation module is used for carrying out channel estimation on each active antenna port according to the demodulation reference signal corresponding to the active antenna port carried in the subframe.
17. The apparatus of claim 16, wherein within each resource block pair, if a number of active antenna ports associated with the subframe is greater than or equal to 13 and less than or equal to 24, a number of demodulation resource bin groups carrying demodulation reference signals for the same active antenna port is 1.
18. The apparatus of claim 16, wherein within each resource block pair, if a number of active antenna ports associated with the subframe is greater than or equal to 9 and less than or equal to 12, a number of demodulation resource bin groups carrying demodulation reference signals for the same active antenna port is 2.
19. The apparatus of claim 16, wherein within each resource block pair, if a number of active antenna ports associated with the subframe is greater than or equal to 1 and less than or equal to 8, a number of demodulation resource bin groups carrying demodulation reference signals for the same active antenna port is 3.
20. The apparatus of any one of claims 16-19, wherein each resource block pair comprises 6 demodulation resource element groups, each demodulation resource element group comprising 4 resource elements.
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| CN102282899B (en) * | 2009-04-24 | 2014-01-01 | 华为技术有限公司 | Method for generating reference signals |
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| US9769813B2 (en) * | 2012-09-05 | 2017-09-19 | Lg Electronics Inc. | Method and apparatus for transmitting downlink signal in wireless communication system |
| CN103841644B (en) * | 2012-11-22 | 2018-04-17 | 电信科学技术研究院 | A kind of method, equipment and system for transmitting demodulated reference signal |
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