CN108023713B - Pilot frequency mapping method and device - Google Patents

Pilot frequency mapping method and device Download PDF

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CN108023713B
CN108023713B CN201610974686.3A CN201610974686A CN108023713B CN 108023713 B CN108023713 B CN 108023713B CN 201610974686 A CN201610974686 A CN 201610974686A CN 108023713 B CN108023713 B CN 108023713B
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dmrs
mapping
resource elements
different
transmission time
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CN108023713A (en
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林祥利
潘学明
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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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
    • 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

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

Abstract

The invention discloses a pilot frequency mapping method and a pilot frequency mapping device, which are used for determining a control channel and a data channel to be demodulated in a short transmission time interval, and mapping demodulation reference signals DMRS for the control channel and the data channel in the short transmission time interval respectively, wherein the DMRS of the control channel is a first DMRS, the DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent from each other. According to the invention, the independent DMRS is allocated to the control channel and the data channel, so that the demodulation of the control channel and the data channel based on the DMRS is realized.

Description

Pilot frequency mapping method and device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a pilot mapping method and apparatus.
Background
With the development and change of the mobile communication service requirement, higher requirements are put forward on the user plane delay performance in the future mobile communication system. One of the main methods for improving the user Time-delay performance is to reduce the length of a Transmission Time Interval (TTI) and introduce a Short Transmission Time Interval (sTTI).
In a communication network, signals are transmitted in units of radio frames (raido frames), each of which is composed of subframes (subframes). For example, in a Long Term Evolution (LTE) Frequency Division Duplex (FDD) system, the Frame Structure shown in fig. 1 may be adopted, and the Frame Structure shown in fig. 1 may be referred to as Frame Structure type 1 (FS 1). In FS1, each carrier includes 10 subframes of 1ms, each subframe has 2 slots (slots) of 0.5ms, and each slot is composed of a fixed number of Orthogonal Frequency Division Multiplexing (OFDM) symbols. In the LTE FDD system, uplink transmission and downlink transmission use different carrier frequencies, but use the same frame structure, i.e., in the LTE FDD system, the TTI duration of uplink transmission and downlink transmission is 1 ms. For another example, in an LTE Time Division Duplex (TDD) system, the Frame Structure shown in fig. 2 may be adopted, and the Frame Structure shown in fig. 2 may be referred to as Frame Structure 2 (FS 2). In FS2, each 10ms radio frame is composed of two 5ms half-frames, each of which contains 5 subframes of 1ms duration. The subframes in FS2 include a Downlink subframe, an Uplink subframe, and special subframes, and each special subframe is composed of a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS). Each half frame comprises at least 1 downlink subframe, at least 1 uplink subframe and at most 1 special subframe. In LTE TDD systems, uplink and downlink transmissions use different subframes or different time slots on the same frequency.
In an LTE network introducing sTTI, sTTI transmission is a more typical working way, that is, a subframe structure defined in the existing mechanism of LTE includes a plurality of short TTI transmissions with a duration shorter than 1 ms. The Downlink transmission supports a short Physical Downlink Shared Channel (sPDSCH) and a short Physical Downlink Control Channel (sPDCCH). The length of sTTI may be 2 or 7 OFDM symbols (although other symbol numbers not exceeding 14 or time domain lengths not exceeding 1ms are not excluded). One subframe may contain multiple sPDSCH, or multiple sPDCCH, or multiple sPDSCH and sPDCCH transmissions. That is, in the existing LTE system, when the length of the sTTI is 7 OFDM symbols, that is, one slot of the subframe is occupied in the time domain, there are a control channel and a data channel of the sTTI, and the control channel and the data channel of the sTTI need to be demodulated based on a Demodulation Reference signal (DMRS).
However, in the conventional LTE system, a Physical Downlink Control Channel (PDCCH) is generally demodulated based on a Cell-specific reference signal (CRS), and the PDCCH is used to carry Downlink Control information, such as an uplink scheduling instruction, a Downlink data transmission instruction, and common Control information. A plurality of PDCCHs can be arranged in a control region of each downlink subframe and occupy 1-3 OFDM symbols. Therefore, in the current communication network applying the sTTI, there is no method for demodulating the control channel and the data channel of the sTTI based on the DMRS.
Disclosure of Invention
The embodiment of the invention provides a pilot frequency mapping method and a pilot frequency mapping device, which are used for allocating independent DMRSs for a control channel and a data channel of an sTTI (transmission time interval indicator) so as to realize demodulation of the control channel and the data channel of the sTTII based on the DMRS.
In a first aspect, a method for pilot mapping is provided, where the method includes:
determining a control channel and a data channel to be demodulated in a short transmission time interval;
mapping demodulation reference signals (DMRS) for the control channel and the data channel respectively;
wherein the DMRS of the control channel is a first DMRS, the DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent of each other.
In the embodiment of the invention, the control channel and the data channel to be demodulated in the short transmission time interval are respectively mapped with the DMRS which are independent of each other, so that the control channel and the data channel in the short transmission time interval are independently demodulated based on the DMRS, and the DMRSs mapped by the control channel and the data channel are independent of each other, so that the resource conflict of the DMRS used for demodulating the data channel and the DMRS used for demodulating the control channel is avoided, and the channel demodulation performance is improved.
In one possible embodiment, mapping DMRS for the control channel and the data channel separately includes:
mapping the first DMRS in a resource element belonging to a control region;
mapping the second DMRS in a resource element belonging to a data region.
In one possible embodiment, mapping DMRS for the control channel and the data channel separately includes:
mapping the first DMRS in a resource element belonging to a control region;
determining reserved resource elements among resource elements of the control region, the reserved resource elements being different from resource elements mapping the first DMRS;
mapping the second DMRS in the reserved resource elements.
In one possible embodiment, the determining of the reserved resource unit in the resource units of the control region includes:
determining a reserved resource unit different from a mapping Common Reference Signal (CRS) resource unit in a resource unit of the control region; and/or determining a reserved resource element in the resource element of the control region according to the resource element pre-mapped with the second DMRS.
In one possible embodiment, mapping the second DMRS in the reserved resource elements includes:
mapping part of the second DMRS or all of the second DMRS in the reserved resource elements.
In one possible embodiment, the resource elements of the first and second DMRS mappings are different.
In one possible implementation, the port number corresponding to the first DMRS is different from the port number of the second DMRS.
In one possible embodiment, the number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or the number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
In one possible embodiment, the number and the positions of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or the number and/or location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
In a second aspect, a pilot mapping apparatus is provided, where the pilot mapping apparatus has a function of implementing the above-mentioned pilot mapping method, and the function may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.
In the case of an integrated unit, the apparatus comprises:
and the determining unit is used for determining a control channel and a data channel to be demodulated in a short transmission time interval.
A processing unit, configured to map demodulation reference signals DMRS for the control channel and the data channel determined by the determining unit, respectively; wherein the DMRS of the control channel is a first DMRS, the DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent of each other.
In one possible implementation manner, the processing unit maps DMRSs for the control channel and the data channel respectively by:
mapping the first DMRS in a resource element belonging to a control region; mapping the second DMRS in a resource element belonging to a data region.
In one possible implementation manner, the processing unit maps DMRSs for the control channel and the data channel respectively by:
mapping the first DMRS in a resource element belonging to a control region; determining reserved resource elements among resource elements of the control region, the reserved resource elements being different from resource elements mapping the first DMRS; mapping the second DMRS in the reserved resource elements.
In a possible implementation manner, the processing unit determines a reserved resource unit among the resource units in the control region by:
determining a reserved resource unit different from a mapping Common Reference Signal (CRS) resource unit in a resource unit of the control region; and/or determining a reserved resource element in the resource element of the control region according to the resource element pre-mapped with the second DMRS.
In a possible implementation manner, the processing unit maps the second DMRS in the reserved resource element in the following manner: mapping part of the second DMRS or all of the second DMRS in the reserved resource elements.
In one possible embodiment, the resource elements of the first and second DMRS mappings are different.
In one possible implementation, the port numbers of the first DMRS and the second DMRS mapped by the processing unit for the control channel and the data channel, respectively, are different.
In one possible embodiment, the number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or the number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
In one possible embodiment, the number and the positions of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or the number and/or location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
In this embodiment of the present invention, the pilot mapping apparatus may also be implemented in a hardware form, and when the hardware form is adopted, the pilot mapping apparatus includes a processor and a memory, and the processor is configured to support the pilot mapping apparatus to execute the above-mentioned pilot mapping method. The pilot mapping apparatus may also include a memory, coupled to the processor, that retains necessary program instructions and data.
In the embodiment of the invention, the control channel and the data channel to be demodulated in the short transmission time interval are respectively mapped with the DMRS which are independent of each other, so that the control channel and the data channel in the short transmission time interval are independently demodulated based on the DMRS, and the DMRSs mapped by the control channel and the data channel are independent of each other, so that the resource conflict of the DMRS used for demodulating the data channel and the DMRS used for demodulating the control channel is avoided, and the channel demodulation performance is improved.
Drawings
Fig. 1 is a frame structure in an LTE system;
fig. 2 is another frame structure in an LTE system; (ii) a
Fig. 3 is a flowchart illustrating mapping of DMRS for a control channel and a data channel in an sTTI according to an embodiment of the present invention;
fig. 4 is another flowchart for mapping DMRS for a control channel and a data channel in an sTTI according to an embodiment of the present invention;
fig. 5 is another flowchart illustrating separately mapping DMRSs for a control channel and a data channel in an sTTI according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a DMRS resource mapping pattern for a data channel and a control channel according to an embodiment of the present invention;
fig. 7 is another schematic diagram of a DMRS resource mapping pattern for a data channel and a control channel according to an embodiment of the present invention;
fig. 8 is another schematic diagram of a DMRS resource mapping pattern for a data channel and a control channel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a pilot mapping apparatus according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another pilot mapping apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments, and not all embodiments, of the present invention.
The embodiment of the invention provides a pilot frequency mapping method, which maps independent DMRS (demodulation reference signal) for a control channel and a data channel in an sTTI (transmission time interval) so as to realize demodulation of the control channel and the data channel in the sTTI based on the DMRS.
The embodiment of the present invention will now describe in detail an implementation process of the pilot mapping method provided in the embodiment of the present invention.
The pilot frequency mapping method described in the embodiment of the present invention may be applicable to an LTE system or other wireless communication systems using various wireless access technologies, and may also be applicable to subsequent evolution systems using the LTE system, such as a fifth generation 5G system. For clarity, the embodiments of the present invention are described below by taking an LTE system as an example.
Embodiments of the present invention an execution subject referred to in the following embodiments may be a network device (e.g., a base station).
Fig. 3 is a flowchart of a pilot mapping method according to an embodiment of the present invention, as shown in fig. 3, including:
s101: and determining a control channel and a data channel to be demodulated in the sTTI.
In the embodiment of the present invention, a control channel and a data channel to be demodulated may be determined by a network device (e.g., a base station).
In the embodiment of the invention, the length of the sTTI in the LTE system is 7 OFDM symbols, a control region and a data region exist in the sTTI with the length of 7 OFDM symbols, the resources of the control region are mainly used for transmitting a control channel, and the resources of the data region are mainly used for transmitting a data channel. Resources in the control region that are not used for transmission of the control channel may also be used for transmission of the data channel.
S102: and mapping DMRS for the control channel and the data channel respectively.
In the embodiment of the present invention, after determining that a control channel and a data channel need to be demodulated, a network device (e.g., a base station) maps DMRSs for the control channel and the data channel, respectively. For convenience of distinction, in the embodiment of the present invention, the DMRS mapped to the control channel is denoted as a first DMRS, the DMRS mapped to the data channel is denoted as a second DMRS, and the first DMRS and the second DMRS are independent of each other.
The following will describe in detail the implementation process of mapping DMRS for the control channel and the data channel in sTTI related to the above embodiments in connection with practical applications.
Fig. 4 is a flowchart of an implementation process for mapping DMRSs for the control channel and the data channel in sTTI according to an embodiment of the present invention, as shown in fig. 4, including:
s201: mapping the first DMRS in a resource element belonging to a control region.
S202: mapping the second DMRS in a resource element belonging to a data region.
In the LTE system, the resource elements may be OFDM symbols. The following description of the embodiments of the present invention takes the resource unit as an OFDM symbol as an example.
In an LTE system, the sTTI is 7 OFDM symbols long, and a control region and a data region exist in one sTTI of 7 OFDM symbols long. In the embodiment of the present invention, a first DMRS of a control channel in an sTTI may be mapped to resource elements of a control region, and a second DMRS of a data channel in the sTTI may be mapped to resource elements of a data region.
Fig. 5 is another flowchart of an implementation process for mapping DMRSs for the control channel and the data channel in sTTI according to the embodiment of the present invention, as shown in fig. 5, including:
s301: mapping the first DMRS in a resource element belonging to a control region.
S302: determining a reserved resource element among resource elements of the control region, the reserved resource element being different from a resource element mapping the first DMRS.
In the embodiment of the invention, the reserved resource units can be determined in the resource units of the control area according to a predetermined rule. For example, the reserved resource units may be determined in one or more of the following ways.
Optionally, in the embodiment of the present invention, the reserved resource units determined in the resource units of the control region are different from the resource unit for mapping the CRS.
Optionally, in the embodiment of the present invention, the reserved resource element determined in the resource element of the control region may be determined according to the resource element that is pre-mapped to the second DMRS, and the resource element that is pre-mapped to the second DMRS may be determined as the reserved resource element.
Optionally, in the embodiment of the present invention, the reserved resource unit determined in the resource unit of the control region is not used for mapping the resource unit of the sPDCCH.
S303: mapping the second DMRS in the reserved resource elements.
The number of the reserved resource elements determined in the embodiment of the present invention is not limited, and may be determined according to the number of the specific mapped second DMRSs. In the embodiment of the present invention, part of the second DMRS may be mapped in the reserved resource element, or all of the second DMRS may be mapped in the reserved resource element.
Optionally, in this embodiment of the present invention, the resource elements mapped to the first DMRS are different from the resource elements mapped to the second DMRS.
Optionally, in this embodiment of the present invention, the port number corresponding to the first DMRS is different from the port number of the second DMRS.
Optionally, in different sTTI in the embodiment of the present invention, patterns for mapping the first DMRS and the second DMRS may be different, in other words, in different sTTI, the number and/or the position of resource elements for mapping the first DMRS may be different. The number and/or location of resource elements mapping the second DMRS may also be different in different sttis.
Optionally, in different sTTI in the embodiment of the present invention, patterns for mapping the first DMRS and for mapping the second DMRS may also be the same, in other words, in different sTTI, the number and the positions of resource elements for mapping the first DMRS may be the same. The number and location of resource elements mapping the second DMRS may also be the same in different sttis.
In the embodiment of the invention, the control channel and the data channel to be demodulated in the sTTI are respectively mapped with the DMRS which are independent of each other, so that the control channel and the data channel in the sTTI are independently demodulated based on the DMRS, and the DMRSs mapped by the control channel and the data channel are independent of each other, so that the resource conflict between the DMRS used for demodulating the data channel and the DMRS used for demodulating the control channel is avoided, and the channel demodulation performance is improved.
In the following, the implementation process involved in the above embodiments for mapping DMRSs for the control channel and the data channel in sTTI respectively will be described in detail with reference to practical applications.
In the embodiment of the present invention, an LTE system is taken as an example, where the sTTI length is 7 OFDM symbols, and 1 Radio Bearer (RB) or 12 subcarriers are taken as a unit in a frequency domain, for example, the description is given. And assuming that a conventional downlink control region (Legacy PDCCH) occupies the first two OFDM symbols of a subframe, and a Common Reference Signal (CRS) occupies 4 ports. The common reference signals may also be referred to as common pilots. Assume that the control region of the sTTI occupies the first two OFDM symbols in addition to the legacy control region.
Fig. 6 is a schematic diagram illustrating a resource mapping pattern for mapping a first DMRS and a second DMRS in an embodiment of the present invention.
As shown in fig. 6, in the first DMRS resource mapping pattern used for demodulating the control channel within sTTI, the first DMRS occupies 2, 6, 12 sub-carrier positions in the frequency domain. The first DMRS occupies the 3 rd and 4 th OFDM symbol positions in the time domain in the first slot. The first DMRS occupies the 1 st and 2 nd OFDM symbol positions in the time domain on the second slot and uses a port number completely different from the second DMRS for the data channel.
As shown in fig. 6, in the resource mapping pattern of the second DMRS for demodulating the data channel within the sTTI, in the first slot, the second DMRS occupies the 6 th and 7 th OFDM symbol positions in the time domain within the sTTI. Occupying the 2 nd, 7 th and 12 th sub-carrier positions in the frequency domain. In the second slot, the second DMRS occupies the 3 rd, 4 th, 6 th, and 7 th OFDM symbol positions in the time domain and the 2 nd and 8 th subcarrier positions in the frequency domain within the sTTI. In the first slot, reserved resource elements of a control region are used for mapping DMRSs of a data channel, and a port number completely different from the first DMRS for a control channel is used.
Fig. 7 illustrates another resource mapping pattern diagram for mapping a first DMRS and a second DMRS in an embodiment of the present invention.
As shown in fig. 7, in the first DMRS resource mapping pattern used for demodulating the control channel within sTTI, the first DMRS occupies 2, 7, 12 sub-carrier positions in the frequency domain. The first DMRS occupies the 3 rd and 4 th OFDM symbol positions in the time domain in the first slot. The first DMRS occupies the 1 st and 2 nd OFDM symbol positions in the time domain on the second slot and uses a port number completely different from the second DMRS for the data channel.
In fig. 7, in the sTTI control region of the first time slot, the selected reserved resource units are the 4 th and 10 th subcarrier positions in the frequency domain, and the 3 rd and 4 th OFDM symbol positions in the time domain. The sTTI control region of the second time slot does not select the reserved resource unit.
As shown in fig. 7, in the resource mapping pattern of the second DMRS for demodulating the data channel in the sTTI, the second DMRS occupies the 3 rd, 4 th, 6 th, and 7 th OFDM symbol positions in the time domain and occupies the 4 th and 10 th subcarrier positions in the frequency domain in the sTTI. In the first slot, reserved resource elements of a control region are used for mapping DMRSs of a data channel, and a port number completely different from the first DMRS for a control channel is used.
Fig. 8 is a schematic diagram illustrating another resource mapping pattern for mapping a first DMRS and a second DMRS in an embodiment of the present invention.
As shown in fig. 8, in the first DMRS resource mapping pattern used for demodulating the control channel within sTTI, the first DMRS occupies 2, 7, 12 sub-carrier positions in the frequency domain. The first DMRS occupies 2 nd and 3 rd OFDM symbol positions in the time domain in the first slot. The first DMRS occupies the 1 st and 2 nd OFDM symbol positions in the time domain on the second slot and uses a port number completely different from the second DMRS for the data channel.
In fig. 8, in the sTTI control region of the first time slot, the selected reserved resource units are the 3 rd and 9 th subcarrier positions in the frequency domain, and the 3 rd OFDM symbol position in the time domain. The sTTI control region of the second time slot does not select the reserved resource unit.
As shown in fig. 8, in the resource mapping pattern of the second DMRS for demodulating the data channel in the sTTI, the second DMRS occupies the 3 rd, 4 th, 6 th, and 7 th OFDM symbol positions in the time domain and occupies the 3 rd and 9 th subcarrier positions in the frequency domain in the sTTI. In the first slot, reserved resource elements of a control region are used for mapping a second DMRS of a data channel, and a port number completely different from the first DMRS used for the control channel is used.
Based on the same inventive concept, the embodiment of the present invention further provides a pilot mapping apparatus, and as the principle of the apparatus for solving the problem is similar to the functional method executed by the network device in the pilot mapping method shown in the above embodiments and the drawings, the implementation of the apparatus may refer to the implementation of the method, and repeated details are not repeated.
In the embodiment shown in fig. 9, there is provided a pilot mapping apparatus, including: a determination unit 101 and a processing unit 102.
A determining unit 101 is configured to determine a control channel and a data channel to be demodulated in the sTTI.
A processing unit 102, configured to map demodulation reference signals DMRS for the control channel and the data channel determined by the determining unit 101, respectively; wherein the DMRS of the control channel is a first DMRS, the DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent of each other.
In a possible implementation manner, the processing unit 102 specifically maps DMRSs for the control channel and the data channel in sTTI in the following manner:
mapping the first DMRS in a resource element belonging to a control region; mapping the second DMRS in a resource element belonging to a data region.
In a possible implementation manner, the processing unit 102 specifically maps DMRSs for the control channel and the data channel in sTTI in the following manner:
mapping the first DMRS in a resource element belonging to a control region; determining reserved resource elements among resource elements of the control region, the reserved resource elements being different from resource elements mapping the first DMRS; mapping the second DMRS in the reserved resource elements.
In a possible implementation manner, the processing unit 102 determines a reserved resource unit among the resource units in the control region by:
determining reserved resource elements different from mapping CRS resource elements in the resource elements of the control region; and/or determining a reserved resource element in the resource element of the control region according to the resource element pre-mapped with the second DMRS.
In one possible implementation, the processing unit 102 maps the second DMRS in the reserved resource elements by: mapping part of the second DMRS or all of the second DMRS in the reserved resource elements.
In one possible embodiment, the resource elements of the first and second DMRS mappings are different.
In one possible implementation, the port numbers of the first DMRS and the second DMRS mapped by the processing unit 102 for the control channel and the data channel, respectively, are different.
In one possible embodiment, the number and/or location of resource elements mapping the first DMRS is different in different sTTI; and/or the number and/or location of resource elements mapping the second DMRS is different in different sTTI.
In one possible implementation, the number and the position of resource elements for mapping the first DMRS are the same in different sTTI; and/or the number and/or the position of resource elements mapping the second DMRS are the same in different sTTIs.
In a specific implementation process, the pilot mapping apparatus may be a network device, and in the following, a hardware structure and a processing manner of the pilot mapping apparatus provided in the embodiment of the present invention are described with the pilot mapping apparatus as the network device as an example.
In the example shown in fig. 10, the pilot mapping apparatus includes: a processor 1001 and a memory 1002.
A memory 1002 for storing program codes executed by the processor 1001.
The processor 1001 is used for calling the program codes stored in the memory 1002 to realize the following functions:
mapping demodulation reference signals (DMRS) for the control channel and the data channel determined by the determining unit 101; wherein the DMRS of the control channel is a first DMRS, the DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent of each other.
In one possible embodiment, the processor 1001 specifically maps DMRS for the control channel and the data channel in sTTI in the following manner:
mapping the first DMRS in a resource element belonging to a control region; mapping the second DMRS in a resource element belonging to a data region.
In one possible embodiment, the processor 1001 specifically maps DMRS for the control channel and the data channel in sTTI in the following manner:
mapping the first DMRS in a resource element belonging to a control region; determining reserved resource elements among resource elements of the control region, the reserved resource elements being different from resource elements mapping the first DMRS; mapping the second DMRS in the reserved resource elements.
In a possible implementation manner, the processor 1001 determines a reserved resource unit among the resource units in the control region by:
determining reserved resource elements different from mapping CRS resource elements in the resource elements of the control region; and/or determining a reserved resource element in the resource element of the control region according to the resource element pre-mapped with the second DMRS.
In one possible implementation, the processor 1001 maps the second DMRS in the reserved resource elements as follows: mapping part of the second DMRS or all of the second DMRS in the reserved resource elements.
In one possible embodiment, the resource elements of the first and second DMRS mappings are different.
In one possible implementation, the port numbers of the first DMRS and the second DMRS mapped by the processor 1001 for the control channel and the data channel, respectively, are different.
In one possible embodiment, the number and/or location of resource elements mapping the first DMRS is different in different sTTI; and/or the number and/or location of resource elements mapping the second DMRS is different in different sTTI.
In different sTTIs, the number and the positions of resource elements for mapping the first DMRS are the same; and/or the number and/or the position of resource elements mapping the second DMRS are the same in different sTTIs.
In the embodiment of the invention, the control channel and the data channel to be demodulated in the sTTI are respectively mapped with the DMRS which are independent of each other, so that the control channel and the data channel in the sTTI are independently demodulated based on the DMRS, and the DMRSs mapped by the control channel and the data channel are independent of each other, so that the resource conflict between the DMRS used for demodulating the data channel and the DMRS used for demodulating the control channel is avoided, and the channel demodulation performance is improved.
It is to be understood that the drawings of the embodiments of the present invention show only a simplified design of a network device. In practical applications, the network device is not limited to the above structure, for example, the network device may further include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all network devices that can implement the embodiments of the present invention are within the protection scope of the embodiments of the present invention.
It can be further understood that the pilot mapping apparatus and the network device according to the embodiments of the present invention can be used to implement corresponding functions of the pilot mapping method according to the foregoing method embodiments of the present invention, so that reference may be made to the description of the related method embodiments where the description of the embodiments of the present invention is not exhaustive, and further description of the embodiments of the present invention is omitted here.
It should be noted that the Processor according to the above embodiments of the present invention may be a Central Processing Unit (CPU), a general purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic devices, transistor logic devices, hardware components, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, and the program may be stored in a computer-readable storage medium, where the storage medium is a non-transitory medium, such as a random access memory, a read only memory, a flash memory, a hard disk, a solid state disk, a magnetic tape (magnetic tape), a floppy disk (floppy disk), an optical disk (optical disk), and any combination thereof.
The present invention has been described with reference to flowchart illustrations and block diagrams, respectively, of methods and apparatus according to embodiments of the invention. It will be understood that each flow and block of the flow diagrams and block diagrams, and combinations of flows and blocks in the flow diagrams and block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and block diagram block or blocks.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (26)

1. A method for pilot mapping, comprising:
determining a control channel and a data channel to be demodulated in a short transmission time interval;
mapping demodulation reference signals (DMRS) for the control channel and the data channel respectively;
wherein the DMRS of the control channel is a first DMRS, the DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent of each other, the first DMRS is mapped in a resource element belonging to a control region; mapping the second DMRS in a resource element belonging to a data region; or
Mapping DMRSs for the control channel and the data channel, respectively, including:
mapping the first DMRS in a resource element belonging to a control region;
determining reserved resource elements among resource elements of the control region, the reserved resource elements being different from resource elements mapping the first DMRS;
mapping the second DMRS in the reserved resource elements, wherein a portion of the second DMRS is mapped in the reserved resource elements.
2. The method of claim 1, wherein the determining of the reserved resource units among the resource units of the control region comprises:
determining a reserved resource unit different from a mapping Common Reference Signal (CRS) resource unit in a resource unit of the control region; and/or
And determining a reserved resource element in the resource elements of the control region according to the resource elements pre-mapped with the second DMRS.
3. The method of any of claims 1 to 2, wherein the resource elements of the first DMRS mapping and the resource elements of the second DMRS mapping are different.
4. The method of any one of claims 1 to 2, wherein a port number corresponding to the first DMRS is different from a port number of the second DMRS.
5. The method of claim 3, wherein the port number corresponding to the first DMRS is different from the port number of the second DMRS.
6. The method of any one of claims 1 to 2, wherein a number and/or a location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
7. The method of claim 3, wherein a number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
8. The method of claim 4, wherein a number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
9. The method of claim 5, wherein a number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
10. The method of any one of claims 1 to 2, wherein a number and a position of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
11. The method of claim 3, wherein a number and a location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
12. The method of claim 4, wherein a number and a location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
13. The method of claim 5, wherein a number and a location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
14. An apparatus for pilot mapping, comprising:
a determining unit, configured to determine a control channel and a data channel to be demodulated in a short transmission time interval;
a processing unit, configured to map demodulation reference signals DMRS for the control channel and the data channel determined by the determining unit, respectively;
wherein the DMRS of the control channel is a first DMRS, the DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent of each other, the first DMRS is mapped in a resource element belonging to a control region; mapping the second DMRS in a resource element belonging to a data region; or
The processing unit maps the DMRS for the control channel and the data channel in the following manner:
mapping the first DMRS in a resource element belonging to a control region;
determining reserved resource elements among resource elements of the control region, the reserved resource elements being different from resource elements mapping the first DMRS;
mapping the second DMRS in the reserved resource elements, wherein a portion of the second DMRS is mapped in the reserved resource elements.
15. The apparatus of claim 14, wherein the processing unit determines the reserved resource units among the resource units of the control region by:
determining a reserved resource unit different from a mapping Common Reference Signal (CRS) resource unit in a resource unit of the control region; and/or
And determining a reserved resource element in the resource elements of the control region according to the resource elements pre-mapped with the second DMRS.
16. The apparatus of any one of claims 14 to 15, wherein the resource elements of the first DMRS mapping and the resource elements of the second DMRS mapping are different.
17. The apparatus of any one of claims 14 to 15, wherein a port number corresponding to the first DMRS is different from a port number of the second DMRS.
18. The apparatus of claim 16, wherein a port number corresponding to the first DMRS is different from a port number of the second DMRS.
19. The apparatus of any one of claims 14 to 15, wherein a number and/or a location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
20. The apparatus of claim 16, wherein a number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
21. The apparatus of claim 17, wherein a number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
22. The apparatus of claim 18, wherein a number and/or location of resource elements mapping the first DMRS is different in different short transmission time intervals; and/or
The number and/or location of resource elements mapping the second DMRS is different in different short transmission time intervals.
23. The apparatus of any one of claims 14 to 15, wherein a number and a position of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and or location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
24. The apparatus of claim 16, wherein a number and a location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and or location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
25. The apparatus of claim 17, wherein a number and a location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and or location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
26. The apparatus of claim 18, wherein a number and a location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or
The number and or location of resource elements mapping the second DMRS are the same in different short transmission time intervals.
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