CN108605318B - Method and equipment for processing demodulation reference signal - Google Patents
Method and equipment for processing demodulation reference signal Download PDFInfo
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- CN108605318B CN108605318B CN201680080939.0A CN201680080939A CN108605318B CN 108605318 B CN108605318 B CN 108605318B CN 201680080939 A CN201680080939 A CN 201680080939A CN 108605318 B CN108605318 B CN 108605318B
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Abstract
The embodiment of the invention discloses a method and equipment for processing demodulation reference signals, which are used for solving the problem that the uplink transmission delay cannot be reduced by a DMRS (demodulation reference signal) mapping mode of a traditional 4G mobile communication system. The method is applied to transmission of ULL service data with ultra-low time delay, the minimum unit allocated to the ULL service data in the time domain of a transmission link is a symbol, and the minimum unit allocated to the ULL service data in the frequency domain of the transmission link is a resource grid block REB, and the method comprises the following steps: the first device determines a first position of the DMRS in the transmission link; when the first device is provided with a cell-related shift and/or a symbol-related shift, the first device determines a second position of the DMRS on the transmission link according to a first function, and maps the DMRS to the second position.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for processing a demodulation reference signal.
Background
Application scenarios of The future fifth Generation (abbreviated as 5G) mobile communication system include not only enhanced mobile broadband service scenarios, but also large-scale internet of things connection, Ultra Low Latency (abbreviated as ULL) and Ultra-high reliability transmission scenarios. Generally, in large-scale internet of things, ULL and ultra-high reliable transmission scenarios, the service model is a small data packet, requiring low-delay transmission. Such as remote meter reading, industrial control, etc.
For ULL service Transmission, the minimum unit of resource allocation in the time domain of the conventional 4G mobile communication system is one Transmission Time Interval (TTI), which is 1ms, and the delay is relatively large compared to ULL service Transmission. The minimum unit of time domain resource allocation of ULL service transmission in the 5G mobile communication system needs to be changed into a short TTI correspondingly, and the minimum unit of the short TTI is an Orthogonal Frequency Division Multiple Access (OFDMA) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol. Meanwhile, the ULL service occupies a part of subcarriers in one OFDMA or one SC-FDMA symbol in the frequency domain, and in the uplink of the conventional 4G mobile communication system, a Demodulation Reference Signal (DMRS) is located in the middle of one subframe and occupies one SC-FDMA symbol, for example: DMRS corresponding to a Physical Uplink Shared Channel (PUSCH) adopts a Zadoff-Chu sequence, and when a subframe is configured as a common cyclic prefix, the DMRS corresponding to the PUSCH is mapped to the 4 th SC-FDMA symbol of each time slot; when the subframe is configured as an extended cyclic prefix, the DMRS corresponding to the PUSCH is mapped to the 3 rd SC-FDMA symbol of each slot. Therefore, the traditional DMRS mapping method for the 4G mobile communication system cannot reduce uplink transmission delay.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for processing a demodulation reference signal, which are used for solving the problem that the uplink transmission delay cannot be reduced by a DMRS (demodulation reference signal) mapping mode of a traditional 4G mobile communication system.
A first aspect of the embodiments of the present invention provides a method for processing a demodulation reference signal DMRS, where the method is applied to transmission of ULL service data with ultra-low latency, a minimum unit allocated to the ULL service data in a time domain of a transmission link is a symbol, and a minimum unit allocated to the ULL service data in a frequency domain of the transmission link is a Resource grid Block (full english: Resource Element Block, abbreviation: REB), and the REB includes a service data Resource grid RE and a DMRS RE, where the service data RE is used to transmit the ULL service data, and the DMRS RE is used to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and the method includes: the method comprises the steps that first equipment determines a first position of a DMRS in the transmission link, wherein the first position is an initial position of the DMRS, which is mapped to the DMRS RE corresponding to the transmission link; when the first device is provided with a cell-related shift and/or a symbol-related shift, the first device determines a second position of the DMRS on the transmission link according to a first function, and maps the DMRS to the second position.
It can be seen that, for ULL service data, the minimum unit allocated by the first device in the time domain of its transmission link is one symbol, and the minimum unit allocated in the frequency domain is one REB, so as to effectively reduce the transmission delay. In addition, one REB includes a service data RE and a DMRS RE, where the DMRS RE is used to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and when a cell correlation shift and/or a symbol correlation shift is set in the first device, the first device maps the DMRS to a corresponding position according to a first function, so as to improve demodulation of the ULL service data and improve utilization rate of a radio resource.
With reference to the first aspect of the embodiment of the present invention, in some possible implementations, the determining, by the first device, the first position of the DMRS in the transmission link includes: the first device acquires resources occupied by the ULL service data; the first device determines a first position of the DMRS in the transmission link according to resources occupied by the ULL service data.
In practical application, the first device determines, according to the resource occupied by the ULL service data, a first position of the DMRS in the transmission link, that is: the first position is an initial position on the DMRS RE corresponding to the transmission link to which the DMRS is mapped. For example: each REB includes 5 service data REs and 1 DMRS RE, and the first device determines a DMRS RE position corresponding to the DMRS according to a resource occupied by the ULL service data.
In other possible implementations, the first device determines that the DMRS is at a first position in the transmission link, the first device determining a first DMRS base sequence; the first device determines a second DMRS base sequence by using the autocorrelation and cross-correlation of the first DMRS base sequence; the first device substitutes the second DMRS base sequence into a second function to determine the DMRS, wherein the DMRS is used for mapping into the DMRS REs.
In practical application, the first device obtains a DMRS base sequence with a certain length according to a generation manner of the DMRS base sequence in the 4G mobile communication system, intercepts the DMRS base sequence according to a required DMRS base sequence length, thereby obtaining a first DMRS base sequence, and further determines the second DMRS base sequence according to autocorrelation and cross-correlation of the first DMRS base sequence, where the first DMRS base sequence with a largest autocorrelation value and a smallest cross-correlation value is generally determined as the second DMRS base sequence, and the second DMRS base sequence is a DMRS base sequence available for the ULL service data.
In other possible implementations, the second position is represented by (k, s), where k represents a subcarrier position occupied by the DMRS in a frequency domain of the transmission link, k is preset by the first device, s represents a symbol position occupied by the DMRS in a time domain of the transmission link, and the first function is represented by
Wherein the content of the first and second substances,
indicating the first position, m is the number of REB,
indicating the number of REs contained in one REB corresponding to the ULL service data;
which is indicative of a cell-related shift,
which represents the cell identity PCI,
indicating symbol correlation shiftThe number of bits is,
nscsymbol identifier, N, representing the ULL service data occupancySCIndicating the total number of symbols occupied by the ULL service data.
In practical application, if the first device configures cell-related shift, the DMRS may shift according to the physical cell identifier, and if the first device configures symbol-related shift, the DMRS may shift according to a symbol occupied by the ULL service data, thereby improving demodulation accuracy of the ULL service data.
In other possible implementations, the second function represents
Wherein the content of the first and second substances,
representing the DMRS, a representing a reusable number of the second DMRS base sequence, j representing a complex number, and n representing a position number of the second DMRS base sequence;
denotes the second DMRS base sequence, u denotes a group number, v denotes an intra-group number,
indicates the length of the second DMRS base sequence.
In practical application, the second DMRS base sequence is substituted into the second function, the DMRS is determined, and the DMRS is mapped to a DMRS RE position of a corresponding transmission link, so that channel estimation and detection are performed on the ULL service data by the DMRS RE, and the DMRS corresponding to the ULL service data is transmitted.
A second aspect of the embodiments of the present invention provides a first device, where the first device is configured to transmit ultra-low latency ULL service data, a minimum unit allocated to the ULL service data in a time domain of a transmission link is one symbol, and a minimum unit allocated to the ULL service data in a frequency domain of the transmission link is a resource grid block REB, where the REB includes a service data resource grid RE and a DMRS RE, where the service data RE is configured to transmit the ULL service data, and the DMRS RE is configured to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and the first device includes:
a determining module, configured to determine a first position of the DMRS in the transmission link, where the first position is an initial position of the DMRS RE mapped to the transmission link;
the determining module is further configured to determine, according to the first function, a second position of the DMRS on the transmission link when the first device is set with a cell correlation shift and/or a symbol correlation shift;
and a processing module, configured to map the DMRS to the second location.
It can be seen that, for ULL service data, the minimum unit allocated by the first device in the time domain of its transmission link is one symbol, and the minimum unit allocated in the frequency domain is one REB, so as to effectively reduce the transmission delay. In addition, one REB includes a service data RE and a DMRS RE, where the DMRS RE is used to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and when a cell-related shift and/or a symbol-related shift is set in the first device, the processing module maps the DMRS to a corresponding position according to a first function, so as to improve demodulation of the ULL service data and improve a utilization rate of a radio resource.
With reference to the first aspect of the embodiment of the present invention, in some possible implementation manners, the determining module is specifically configured to acquire a resource occupied by the ULL service data, and determine the first position of the DMRS in the transmission link according to the resource occupied by the ULL service data.
In practical application, the determining module determines the first position of the DMRS in the transmission link according to the resource occupied by the ULL service data, that is: the first position is an initial position on the DMRS RE corresponding to the transmission link to which the DMRS is mapped. For example: each REB includes 5 service data REs and 1 DMRS RE, and the determining module determines a DMRS RE position corresponding to the DMRS according to a resource occupied by the ULL service data.
In other possible implementations, the determining module is further configured to determine a first DMRS base sequence before determining the first position of the DMRS in the transmission link, determine a second DMRS base sequence using the auto-correlation and cross-correlation of the first DMRS base sequence, and substitute the second DMRS base sequence into a second function to determine the DMRS, wherein the DMRS is used for mapping into the DMRS REs.
In practical application, the determining module obtains a DMRS base sequence with a certain length according to a generation manner of the DMRS base sequence in the 4G mobile communication system, intercepts the DMRS base sequence according to a required DMRS base sequence length, thereby obtaining a first DMRS base sequence, and further determines the second DMRS base sequence according to autocorrelation and cross-correlation of the first DMRS base sequence, where the first DMRS base sequence with a largest autocorrelation value and a smallest cross-correlation value is generally determined as the second DMRS base sequence, and the second DMRS base sequence is a DMRS base sequence available for the ULL service data.
In other possible implementations, the second position is represented by (k, s), where k represents a subcarrier position occupied by the DMRS in a frequency domain of the transmission link, k is preset by the first device, s represents a symbol position occupied by the DMRS in a time domain of the transmission link, and the first function is represented by
Wherein the content of the first and second substances,
indicating the first position, m is the number of REB,
indicating the number of REs contained in one REB corresponding to the ULL service data;
which is indicative of a cell-related shift,
which represents the cell identity PCI,
which represents a symbol-dependent shift of the symbol,
nscsymbol identifier, N, representing the ULL service data occupancySCIndicating the total number of symbols occupied by the ULL service data.
In other possible implementations, the second function represents
Wherein, in the step (A),
representing the DMRS, a representing a reusable number of the second DMRS base sequence, j representing a complex number, and n representing a position number of the second DMRS base sequence;
denotes the second DMRS base sequence, u denotes a group number, v denotes an intra-group number,
indicates the length of the second DMRS base sequence.
In practical application, if the first device configures cell-related shift, the DMRS may shift according to the physical cell identifier, and if the first device configures symbol-related shift, the DMRS may shift according to a symbol occupied by the ULL service data, thereby improving demodulation accuracy of the ULL service data.
A third aspect of an embodiment of the present invention provides a first device, including: one or more processors, a memory, a bus system, and a transceiver, the processors, the memory, and the transceiver being connected by the bus system; wherein one or more programs are stored in the memory, the one or more programs comprising instructions which, when executed by the first device, cause the first device to perform the method according to the first aspect or any possible implementation manner of the first aspect.
It can be seen that, for ULL service data, the minimum unit allocated by the first device in the time domain of its transmission link is one symbol, and the minimum unit allocated in the frequency domain is one REB, so as to effectively reduce the transmission delay. In addition, one REB includes a service data RE and a DMRS RE, where the DMRS RE is used to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and when a cell correlation shift and/or a symbol correlation shift is set in the first device, the first device maps the DMRS to a corresponding position according to a first function, so as to improve demodulation of the ULL service data and improve utilization rate of a radio resource.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a method for processing a DMRS according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of ULL service resource allocation in an embodiment of the present invention;
fig. 3-a is a schematic structural diagram of an occupied position of DMRS in an embodiment of the present invention;
fig. 3-b is a schematic structural diagram of DMRS occupation location mapping in an embodiment of the present invention;
fig. 3-c is another structural diagram of DMRS occupancy location mapping in the embodiment of the present invention;
fig. 3-d is another schematic structural diagram of DMRS occupation location mapping in the embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first apparatus according to an embodiment of the present invention;
fig. 5 is another schematic structural diagram of the first device in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical scheme of the invention can be applied to various communication systems, such as: global System for Mobile communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (Long Term Evolution), and so on.
The first device is a Base Station, where the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, or an evolved node B (eNB or e-NodeB) in LTE, and the present invention is not limited thereto.
Or, the first device is a Mobile management Network element, where the Mobile management Network element may be a Mobile Management Entity (MME) connected to an Evolved Universal Mobile Telecommunications System (UMTS) terrestrial Radio Access Network (E-UTRAN), a Serving GPRS (General Packet Radio Service) Node connected to a UMTS terrestrial Radio Access Network (GERAN)/GSM EDGE Radio Access Network (GERAN); an Access Gateway (AGW) in a non-3 GPP Network, an entity with an Evolved Packet Data Gateway (EPDG) mobility management logic function in a Wireless Local Area Network (WLAN), an Access Service Network Gateway (ASN GW) in a Worldwide Interoperability for Microwave Access (WiMAX) Network, or AN entity having a High Rate Packet Data Access Network (HRPD-AN) Access mobility management logic function in a wideband Code Division Multiple Access (CDMA) Network, or AN entity implementing a user equipment mobility management logic function in other networks.
Before the embodiment of the present invention is introduced, a scenario to which the present invention is applied is introduced, and for ULL service transmission, a minimum unit of resource allocation in a time domain of a conventional 4G mobile communication system is one TTI, that is, 1ms, and the delay is relatively large compared to ULL service transmission. The minimum unit of ULL traffic transmission time domain resource allocation in the 5G mobile communication system accordingly needs to become a short TTI, the minimum unit of which is one OFDMA or SC-FDMA symbol. Meanwhile, ULL traffic occupies a part of subcarriers in one OFDMA or one SC-FDMA symbol in the frequency domain, and in the uplink of the conventional 4G mobile communication system, DMRS is located in the middle of one subframe and occupies one SC-FDMA symbol, for example: the DMRS corresponding to the PUSCH adopts a Zadoff-Chu sequence, and when the subframe is configured to be a common cyclic prefix, the DMRS corresponding to the PUSCH is mapped to the 4 th SC-FDMA symbol of each time slot; when the subframe is configured as an extended cyclic prefix, the DMRS corresponding to the PUSCH is mapped to the 3 rd SC-FDMA symbol of each slot. Therefore, the traditional DMRS mapping method for the 4G mobile communication system cannot reduce uplink transmission delay.
In a future 5G mobile communication system, when transmitting ULL service data, one or more independent regions may be divided within a system frequency band as ULL service dedicated regions, where a minimum unit of ULL service data allocation in a time domain is one SC-FDMA symbol, and a minimum unit of frequency domain resource allocation is one REB. One REB contains service data RE and DMRS RE, wherein the service data RE is used for transmitting ULL service data; the DMRS RE is used to transmit ULL service data and a corresponding DMRS, and perform channel estimation and detection on the ULL service data. Thus, the SC-FDMA symbols in the ULL service dedicated area may be divided into a plurality of REBs, while the PUSCH, the Physical Uplink Control Channel (PUCCH), the Physical Random Access Channel (PRACH), the DMRS, and the Sounding Reference Signal (SRS) in the conventional 4G mobile communication system remain unchanged. According to the different requirements of ULL services on delay, one ULL service may occupy several REBs in the time domain or frequency domain, and the ULL service resource allocation follows the principle of first frequency domain and then time domain.
Referring to fig. 1, an embodiment of a method for processing DMRS in an embodiment of the present invention is illustrated, where the method is applied to transmission of ultra-low latency ULL service data, a minimum unit allocated to the ULL service data in a time domain of a transmission link is one symbol, a minimum unit allocated to the ULL service data in a frequency domain of the transmission link is one resource grid block REB, the REB includes a service data resource grid RE and DMRS REs, where the service data RE is used for transmitting the ULL service data, and the DMRS RE is used for performing channel estimation and detection on the ULL service data and transmitting a DMRS corresponding to the ULL service data, and a specific flow of the embodiment is as follows:
In practical application, the first equipment determines the first DMRS base sequence according to the generation mode of the DMRS base sequence in the 4G mobile communication,
wherein the content of the first and second substances,
representing a length of a first DMRS base sequence, m representing a number of resource blocks, RBs, allocated by the first device on the transmission link,
indicates the number of sub-carriers included in each RB,
indicating the maximum number of RBs included on the transmission link.
Wherein, when the length of the first DMRS base sequence is larger than that of the first DMRS base sequence
Then, the generation formula of the first DMRS base sequence is:
wherein the content of the first and second substances,
represents the first DMRS base sequence and the second DMRS base sequence,
denotes the length of the Zadoff-Chu sequence, n' is the position number of the first DMRS base sequence, xqDenotes the q-th Zadoff-Chu sequence, xqIs defined as:
whereinAnd q is defined as:
when the length of the first DMRS base sequence is less than
Then, the generation formula of the first DMRS base sequence is:
where φ (n') is shown in tables one and two:
watch 1 (
Phi (n')
Watch two (
Phi (n')
In a conventional 4G mobile communication system, the length of the first DMRS base sequence is an integer multiple of one RB subcarrier number, and taking a normal subframe as an example, the length of the first DMRS base sequence is an integer multiple of 12 RB subcarrier numbers. Assuming that the length required by the second DMRS base sequence of ULL service data in the 5G mobile communication system is 6, the length may be obtained according to the generation method of the DMRS base sequence in the 4G mobile communication system
As shown in table 1 and table two, any 6 bits in the first DMRS base sequence group are further truncated as the available second bit corresponding to ULL service dataA DMRS base sequence.
And 102, the first equipment determines a second DMRS base sequence by utilizing the autocorrelation and cross correlation of the first DMRS base sequence.
Wherein, the correlation among sequences of the ULL service data DMRS motifs is shown in the third table:
watch III
In practical application, an available first DMRS base sequence with the largest autocorrelation value and the smallest cross-correlation value is selected as a second DMRS base sequence corresponding to ULL service data.
In some possible implementations, the group number of the second DMRS base sequence is left unchanged for compatibility with existing 4G mobile communication systems. It can be seen that when the length of the ULL service data DMRS base sequence is 6, the group number of the available second DMRS base sequence does not include 3, 4, 14, 20, 23.
As can be seen, the generation manner of the second DMRS base sequence corresponding to ULL service data is as follows: firstly, generating a first DMRS base sequence according to a mode that a transmission link in the existing 4G mobile communication system corresponds to a DMRS base sequence, wherein the length of the first DMRS base sequence corresponding to the transmission link is required to be not less than the length required by the DMRS base sequence corresponding to the ULL service, and is an integral multiple of the number of subcarriers contained in each RB; secondly, intercepting the required length of the DMRS base sequence corresponding to the ULL service from the generated first DMRS base sequence to obtain an available first DMRS base sequence; thirdly, calculating autocorrelation and cross correlation among base sequences in the cut available first DMRS base sequences; then, selecting an available first DMRS base sequence with the maximum autocorrelation value and the minimum cross correlation value as a second DMRS base sequence corresponding to the ULL service; and finally, keeping the group number of the second DMRS base sequence unchanged so as to be compatible with the existing 4G mobile communication system.
And 103, the first device substitutes the second DMRS base sequence into a second function to determine the DMRS.
Wherein the DMRS is used for mapping into the DMRS RE, wherein the DMRS RE is a sub-carrier of the DMRS REThe second function is expressed as
Wherein the content of the first and second substances,
representing the DMRS, a representing a number by which a second DMRS base sequence can be multiplexed, j representing a complex number, and n representing a position number of the second DMRS base sequence;
represents the second DMRS base sequence, u represents a group number, v represents an intra-group number,
represents a length of the second DMRS base sequence.
And 104, the first device determines a first position of the DMRS in the transmission link.
Wherein the first position is an initial position on the DMRS RE corresponding to the transmission link to which the DMRS is mapped.
In practical applications, the determining, by the first device, the first location of the DMRS in the transmission link includes: the first equipment acquires resources occupied by the ULL service data; and the first device determines a first position of the DMRS in the transmission link according to the resource occupied by the ULL service data.
In practical application, the DMRS mapping process corresponding to ULL service data is as follows: obtaining the initial position of the DMRS RE according to the resource occupied by the ULL service data determined by the scheduling information, wherein if the base station is configured with Cell-related shift, the RE occupied by the DMRS can be shifted according to Physical Layer Cell Identity (PCI); if the base station configures symbol-related shift, the RE occupied by the DMRS can shift according to the symbols occupied by the UE; if the base station configures the cell and the symbol related shift at the same time, the RE occupied by the DMRS can shift according to the PCI and the symbol occupied by the UE.
And 106, the first equipment determines a second position of the DMRS on the transmission link according to the first function, and maps the DMRS to the second position.
Wherein the second position is represented by (k, s), where k represents a subcarrier position occupied by the DMRS in the frequency domain of the transmission link, k is preset by the first device, s represents a symbol position occupied by the DMRS in the time domain of the transmission link, and the first function is represented by
Wherein the content of the first and second substances,
representing said first position, m being the number of REB,
indicating the number of REs contained in one REB corresponding to the ULL service data;
which is indicative of a cell-related shift,
which represents the cell identity PCI,
which represents a symbol-dependent shift of the symbol,
nscsymbol identifier, N, representing the ULL service data occupancySCAnd the total symbol number occupied by the ULL service data is represented.
Taking the uplink of the 4G mobile communication system as an example, the uplink subframe is assumed to be a normal cyclic prefix, and the PUCCH format is 1/1a/1 b. One or more separate regions are allocated within the system frequency band as dedicated regions for ULL traffic data. One SC-FDMA symbol is divided into multiple REBs in the frequency domain, and assuming that each REB has 6 REs, including 1 DMRS RE and 5 traffic data REs, the resource allocation of one uplink subframe is as shown in fig. 2.
As can be seen from fig. 2, the DMRS overhead corresponding to the PUSCH is about 14% ((number of DMRS REs in 1 PRB)/84 (number of REs in 1 PRB 12 × 7) × 100%), the DMRS overhead in the ULL service region is about 17% (2 × 7 (number of DMRS REs in 1 PRB)/84 × 100%), and the DMRS overhead in the ULL service region is close to the PUSCH, which does not cause significant system performance degradation.
Taking one PRB group in the ULL service area as an example, assuming that the length of the REB is 6 REs, where DMRS REs occupy the first RE of each REB, the first position occupied by the DMRS is schematically shown in fig. 3-a by default.
If the base station configures cell-related shift when the ULL service data DMRS is mapped, assuming that there are 3 cells and the cell PCIs are 0, 2, and 4, respectively, the first device maps the REs occupied by the DMRS to the second location, as shown in fig. 3-b; if the base station configures symbol-related shift during DMRS mapping for ULL service data, and the ULL service occupies 3 symbols, the first device maps REs occupied by the DMRS to a second location as shown in fig. 3-c; if the base station simultaneously configures cells and symbol-related shifts when the ULL service data DMRS is mapped, assuming that there are 2 cells, the PCI of each cell is 0 or 4, and each ULL service occupies 3 symbols, the first device maps REs occupied by the DMRS to a second location as shown in fig. 3-d.
Therefore, when the ULL service of the 5G mobile communication system is transmitted in an uplink manner in the future, the first device can configure the DMRS to shift according to the cell PCI, so that interference between DMRSs of adjacent cells can be effectively avoided, and the first device can also configure the DMRS to shift according to the number of symbols occupied by the ULL, so that channel estimation accuracy can be improved, and detection performance can be improved.
To facilitate a better understanding of the above-described related methods of embodiments of the present invention, the following also provides related apparatus for cooperating with the above-described methods.
Referring to fig. 4, a schematic structural diagram of a first device 400 in an embodiment of the present invention, where the first device 400 is configured to transmit ultra-low latency ULL service data, a minimum unit allocated to the ULL service data in a time domain of a transmission link is one symbol, and a minimum unit allocated to the ULL service data in a frequency domain of the transmission link is one resource grid block REB, where the REB includes a service data resource grid RE and DMRS REs, where the service data RE is used to transmit the ULL service data, the DMRS REs are used to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and the first device 400 includes: a determination module 401 and a processing module 402.
A determining module 401, configured to determine a first location of the DMRS in the transmission link, wherein the first location is an initial location on the DMRS RE corresponding to the transmission link to which the DMRS is mapped;
in some possible implementations, the determining module 401 is specifically configured to acquire resources occupied by the ULL service data, and determine the first position of the DMRS in the transmission link according to the resources occupied by the ULL service data.
In other possible implementations, the determining module 401 is further configured to determine a first DMRS base sequence before determining the first position of the DMRS in the transmission link, determine a second DMRS base sequence by using auto-correlation and cross-correlation of the first DMRS base sequence, and substitute the second DMRS base sequence into a second function to determine the DMRS, wherein the DMRS is used for mapping into the DMRS REs.
Wherein the second function is represented as
Wherein the content of the first and second substances,
representing the DMRS, a representing a number by which a second DMRS base sequence can be multiplexed, j representing a complex number, and n representing a position number of the second DMRS base sequence;
represents the second DMRS base sequence, u represents a group number, v represents an intra-group number,
represents a length of the second DMRS base sequence.
The determining module 401 is further configured to determine, according to a first function, a second position of the DMRS on the transmission link when the first device is set with a cell-related shift and/or a symbol-related shift;
wherein the second position is represented by (k, s), where k represents a subcarrier position occupied by the DMRS in the frequency domain of the transmission link, k is preset by the first device, s represents a symbol position occupied by the DMRS in the time domain of the transmission link, and the first function is represented by
Wherein the content of the first and second substances,
representing said first position, m being the number of REB,
indicating the number of REs contained in one REB corresponding to the ULL service data;
which is indicative of a cell-related shift,
which represents the cell identity PCI,
which represents a symbol-dependent shift of the symbol,
nscsymbol identifier, N, representing the ULL service data occupancySCAnd the total symbol number occupied by the ULL service data is represented.
A processing module 402 configured to map the DMRS to the second location.
It can be seen that, for ULL service data, the minimum unit allocated by the first device in the time domain of its transmission link is one symbol, and the minimum unit allocated in the frequency domain is one REB, so as to effectively reduce the transmission delay. In addition, one REB includes a service data RE and a DMRS RE, where the DMRS RE is used to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and when a cell-related shift and/or a symbol-related shift is set in the first device, the processing module maps the DMRS to a corresponding position according to a first function, so as to improve demodulation of the ULL service data and improve a utilization rate of a radio resource.
In one possible implementation, the determining module 401 and the processing module 402 may be software modules, may be executed in a processor of a computer system, or may be a specific integrated circuit.
The embodiment shown in fig. 4 explains the specific structure of the first device from the perspective of the functional module, and the following explains the specific structure of the first device from the perspective of hardware in conjunction with the embodiment of fig. 5:
referring to fig. 5, another structural diagram of a first device 500 according to an embodiment of the present invention is shown, where the first device 500 includes one or more processors 501, a memory 502, a bus system 503, and a transceiver 504, where the processors 501, the memory 502, and the transceiver 504 are connected through the bus system 503, where the memory 502 stores one or more programs 505, and the one or more programs 505 include instructions that, when executed by the first device 500, cause the first device 500 to perform the method shown in the embodiment of fig. 1.
It should be noted that the processor 501 may be a CPU, and the processor 501 may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor, or the processor may be any conventional processor or the like. In the implementation process, the step of the first device accessing the hard disk data of the host device may be performed by an instruction in the form of a hardware integrated logic circuit or software in the processor 501, and may be directly implemented as a hardware processor, or performed by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 502, and the processor 501 reads the information in the memory 502 and completes the steps of the method in combination with the hardware. To avoid repetition, it is not described in detail here.
It should be noted that the first device shown in fig. 5 may correspond to the first device in the method for processing a DMRS in the embodiment of the present invention, and the above and other operations and/or functions of each unit in the first device are respectively for implementing a corresponding flow of the method shown in fig. 1, and are not described herein again for brevity.
In summary, for ULL service data, the minimum unit allocated by the first device in the time domain of its transmission link is one symbol, and the minimum unit allocated in the frequency domain is one REB, so that the transmission delay is effectively reduced. In addition, one REB includes a service data RE and a DMRS RE, where the DMRS RE is used to perform channel estimation and detection on the ULL service data and transmit a DMRS corresponding to the ULL service data, and when a cell correlation shift and/or a symbol correlation shift is set in the first device, the first device maps the DMRS to a corresponding position according to a first function, so as to improve demodulation of the ULL service data and improve utilization rate of a radio resource.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the portable electronic device, the computer-readable storage medium and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the technical solution provided by the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The method and the apparatus for processing demodulation reference signals provided by the present invention are described in detail above, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A method for processing DMRS (demodulation reference signal), applied to transmission of ultra-low latency ULL traffic data, wherein a minimum unit allocated to the ULL traffic data in a time domain of a transmission link is one symbol, and a minimum unit allocated to the ULL traffic data in a frequency domain of the transmission link is one resource grid block REB, where the REB includes a traffic data resource grid RE and DMRS REs, wherein the traffic data RE is used for transmitting the ULL traffic data, and the DMRS REs are used for performing channel estimation and detection on the ULL traffic data and transmitting a DMRS corresponding to the ULL traffic data, the method comprising:
a first device determines a first position of a DMRS in the transmission link, wherein the first position is an initial position on the DMRS RE corresponding to the transmission link to which the DMRS is mapped;
when the first device is provided with a cell-related shift and/or a symbol-related shift, the first device determines a second position of the DMRS on the transmission link according to a first function, and maps the DMRS to the second position;
the second position is represented by (k, s), where k represents a subcarrier position occupied by the DMRS in the frequency domain of the transmission link, k is preset by the first device, s represents a symbol position occupied by the DMRS in the time domain of the transmission link, and the first function is represented by
Wherein the content of the first and second substances,
representing said first position, m being the number of REB,
indicating the number of REs contained in one REB corresponding to the ULL service data;
which is indicative of a cell-related shift,
which represents the cell identity PCI,
which represents a symbol-dependent shift of the symbol,
nscsymbol identifier, N, representing the ULL service data occupancySCAnd the total symbol number occupied by the ULL service data is represented.
2. The method of claim 1, wherein the first device determining the first location of the DMRS in the transmission link comprises:
the first equipment acquires resources occupied by the ULL service data;
and the first device determines a first position of the DMRS in the transmission link according to the resource occupied by the ULL service data.
3. The method of claim 1 or 2, wherein the first device determines that the DMRS is at the first position in the transmission link, the method further comprising:
the first device determining a first DMRS base sequence;
the first device determining a second DMRS base sequence using auto-and cross-correlations of the first DMRS base sequence;
the first device substitutes the second DMRS base sequence into a second function to determine the DMRS, wherein the DMRS is for mapping into the DMRS REs.
4. The method of claim 3, wherein the second function is represented as
Wherein the content of the first and second substances,
representing the DMRS, a representing a number by which a second DMRS base sequence can be multiplexed, j representing a complex number, and n representing a position number of the second DMRS base sequence;
presentation instrumentWherein u represents a group number, v represents an intra-group number,
represents a length of the second DMRS base sequence.
5. A first device for processing DMRS, wherein the first device is configured to transmit ultra-low latency ULL traffic data, a minimum unit allocated to the ULL traffic data in a time domain of a transmission link is one symbol, a minimum unit allocated to the ULL traffic data in a frequency domain of the transmission link is one resource grid block REB, and the REB comprises a traffic data resource grid RE and DMRS REs, wherein the traffic data RE is configured to transmit the ULL traffic data, and the DMRS REs are configured to perform channel estimation and detection on the ULL traffic data and transmit a DMRS corresponding to the ULL traffic data, and wherein the first device comprises:
a determining module, configured to determine a first position of the DMRS in the transmission link, wherein the first position is an initial position on the DMRS RE corresponding to the transmission link to which the DMRS is mapped;
the determining module is further configured to determine, according to a first function, a second position of the DMRS on the transmission link when the first device is set with a cell-related shift and/or a symbol-related shift;
a processing module configured to map the DMRS to the second location;
the second position is represented by (k, s), where k represents a subcarrier position occupied by the DMRS in the frequency domain of the transmission link, k is preset by the first device, s represents a symbol position occupied by the DMRS in the time domain of the transmission link, and the first function is represented by
Wherein the content of the first and second substances,
representing said first position, m being the number of REB,
indicating the number of REs contained in one REB corresponding to the ULL service data;
which is indicative of a cell-related shift,
which represents the cell identity PCI,
which represents a symbol-dependent shift of the symbol,
nscsymbol identifier, N, representing the ULL service data occupancySCAnd the total symbol number occupied by the ULL service data is represented.
6. The first device of claim 5, wherein the determining module is specifically configured to acquire resources occupied by the ULL service data, and determine the first position of the DMRS in the transmission link according to the resources occupied by the ULL service data.
7. The first apparatus of claim 5 or 6, wherein the determining module is further configured to, prior to determining the first location of the DMRS in the transmission link, determine a first DMRS base sequence, determine a second DMRS base sequence using auto-and cross-correlation of the first DMRS base sequence, and substitute the second DMRS base sequence into a second function to determine the DMRS, wherein the DMRS is used for mapping into the DMRS REs.
8. The first device of claim 7, wherein the second function is represented as
Wherein the content of the first and second substances,
representing the DMRS, a representing a number by which a second DMRS base sequence can be multiplexed, j representing a complex number, and n representing a position number of the second DMRS base sequence;
represents the second DMRS base sequence, u represents a group number, v represents an intra-group number,
represents a length of the second DMRS base sequence.
9. A first device that processes a DMRS, comprising:
one or more processors, a memory, a bus system, and a transceiver, the processors, the memory, and the transceiver being connected by the bus system;
wherein the memory stores one or more programs therein, the one or more programs comprising instructions that, when executed by the first device, cause the first device to perform the method of any of claims 1-4.
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| CN101741462A (en) * | 2009-12-14 | 2010-06-16 | 中兴通讯股份有限公司 | Method for processing demodulation reference signal dynamic cyclic shift parameters |
| CN102804889A (en) * | 2009-06-19 | 2012-11-28 | 松下电器产业株式会社 | Method And Device For Setting Demodulation Reference Signals In Wireless Communication System |
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| CN101741462A (en) * | 2009-12-14 | 2010-06-16 | 中兴通讯股份有限公司 | Method for processing demodulation reference signal dynamic cyclic shift parameters |
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