CN110858796A - Method for generating pilot signal of physical uplink shared channel - Google Patents

Method for generating pilot signal of physical uplink shared channel Download PDF

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CN110858796A
CN110858796A CN201810965563.2A CN201810965563A CN110858796A CN 110858796 A CN110858796 A CN 110858796A CN 201810965563 A CN201810965563 A CN 201810965563A CN 110858796 A CN110858796 A CN 110858796A
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sequence
pusch
subframe
pilot
pilot signal
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朱莉森
王姗
戴楚平
陈宏超
冯绍鹏
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Potevio Information Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Abstract

The invention discloses a method for generating a PUSCH pilot signal of a physical uplink shared channel, which is characterized in that in the process of setting a PUSCH pilot signal sequence, two sequences of a group hop and a cyclic shift factor are generated according to a wireless frame number, a subframe number and a pilot sequence number in a subframe during generation, so that the PUSCH pilot signal is finally obtained based on the two sequences. The two sequences are formed by the radio frame number, the subframe number and the pilot sequence number in the subframe, so that the generation modes of the pilot sequences of the time domain symbols of the same radio frame are consistent under different scheduling modes, the interference of the pilot signals of the adjacent regions is randomized, the PUSCH pilot signal sequence can be generated by adopting the same parameters and modes under different scheduling modes, and the realization complexity is reduced. Therefore, the method provided by the embodiment of the invention meets the requirement of setting one or two rows of pilot signals in one subframe, so that when the PUSCH transmits the uplink service, the scheduling of the uplink service by the two scheduling modes can be simultaneously supported.

Description

Method for generating pilot signal of physical uplink shared channel
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for generating a Physical Uplink Shared Channel (PUSCH) pilot signal.
Background
The Long Term Evolution (LTE) system provides users with high-speed data transmission services as a mainstream technology of fourth-generation (4G) communication networks. In some application scenarios based on the LTE system, such as data acquisition of a smart grid of a power system, a flexible transmission mode needs to be adopted for uplink to adapt to different service transmission requirements.
Taking an electric power system based on an LTE system as an example, the electric power system adopts a time division system, and uplink and downlink are transmitted in a time division manner. Fig. 1 is a schematic diagram of a time domain frame structure adopted by a power system based on an LTE system provided in the prior art, as shown in the figure: there are 5 subframes in 1 radio frame, wherein, subframe 0 is used for downlink transmission, subframe 1 is special subframe, and subframes 2 ~ 4 are used for uplink transmission.
For the uplink service with small data volume, high requirement on time efficiency and high requirement on transmission quality, if the uplink service is scheduled according to a radio frame scheduling mode, the base station starts to demodulate and decode the uplink service received by the first radio frame after the first radio frame is completely finished, namely, the base station demodulates and decodes the uplink service in the time period of the downlink subframe 0 of the second radio frame. Because the demodulation and decoding needs time, the demodulation and decoding result of the uplink service of the first radio frame cannot be obtained before the downlink sub-frame 0 of the second radio frame arrives, and the acknowledgement or non-acknowledgement (ACK/NACK) information needing to be fed back is obtained according to the demodulation and decoding result, so the ACK/NACK information of the uplink service of the first radio frame can only be fed back by waiting for the downlink sub-frame 0 of the third radio frame. Fig. 2 is a schematic diagram of a radio frame timing sequence in which a power system based on an LTE system provided in the prior art schedules an uplink service by using a radio frame. By adopting the mode to schedule the uplink service, the terminal sends the uplink service from the uplink PUSCH, and receives the ACK/NACK information of the uplink PUSCH to the terminal, at least 3 wireless frames are needed for PUSCH retransmission or PUSCH new data sending according to the ACK/NACK information, and the time delay of the PUSCH for transmitting the uplink service is larger. If the scheduling is performed according to the single subframe scheduling manner, assuming that subframe 2 of the first radio frame completes the transmission of the uplink service, the base station may complete the demodulation and decoding of the uplink service before subframe 0 of the second radio frame arrives, and obtain ACK/NACK information to be fed back according to the demodulation and decoding result, the terminal may receive the ACK/NACK information in the 2 nd radio frame and perform retransmission of the PUSCH uplink service or send a new uplink service of the PUSCH according to the information, and the two radio frames may complete the uplink service transmission process, as shown in fig. 3, fig. 3 is a radio frame timing diagram illustrating that the power system based on the LTE system provided by the prior art uses a single subframe to schedule the uplink service. As can be seen from fig. 3, compared with the wireless frame scheduling method, the time delay of uplink service transmission through the PUSCH can be effectively reduced, and the requirement of the uplink service on the time delay is ensured.
For the uplink service with large data volume and low time efficiency requirement, if only a single subframe scheduling mode is adopted, the scheduling granularity is too small, and the required signaling overhead is large. At this time, if a radio frame scheduling mode is adopted, signaling overhead can be reduced, and scheduling efficiency is improved.
In addition, the uplink service has less data volume, so in order to improve the frequency offset estimation accuracy of the pilot signals, two rows of pilot signals can be adopted in a single subframe for frequency offset estimation. For the uplink service with large data volume and low time efficiency requirement, due to the adoption of a wireless frame scheduling mode, even if a single-row pilot signal is arranged in each subframe, one wireless frame can carry out frequency offset estimation through three rows of pilot signals, and the resource utilization rate can be improved while the frequency offset estimation precision is not sacrificed.
In summary, in the power system based on the LTE system, in order to meet the requirements of different types of uplink services, the PUSCH needs to support a single subframe scheduling manner and a wireless frame scheduling manner, and even further includes different scheduling requirements such as the two scheduling manners, a pilot signal design meeting the requirement of setting one or two rows of pilot signals in one subframe needs to be provided, so as to simultaneously support the scheduling of the uplink services by the two scheduling manners.
However, at present, in an electric power system based on the LTE system, there is no method for setting pilot signals, which can meet the requirement of setting one or two rows of pilot signals in one subframe, so that when the PUSCH transmits an uplink service, scheduling of the uplink service by the two scheduling methods can be simultaneously supported.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method for generating PUSCH pilot signals, which can meet the requirement of setting one or two rows of pilot signals in one subframe, so that when PUSCH transmits an uplink service, scheduling of the uplink service by the two scheduling manners can be simultaneously supported.
The embodiment of the invention is realized as follows:
a method for generating a Physical Uplink Shared Channel (PUSCH) pilot signal comprises the following steps:
setting a PUSCH pilot signal sequence for frequency offset estimation;
generating two sequences of group hopping and cyclic shift factors in a PUSCH pilot signal sequence according to a wireless frame number, a subframe number and a pilot sequence number in a subframe respectively;
and generating two sequences of group hopping and cyclic shift factors in the PUSCH pilot signal sequence, and then generating the PUSCH pilot signal.
As can be seen from the above, in the process of setting the PUSCH pilot signal sequence, the two sequences of the group hopping and the cyclic shift factor are generated according to the radio frame number, the subframe number, and the pilot sequence number in the subframe during the generation, so that the PUSCH pilot signal is finally obtained based on the two sequences. The two sequences are formed by the radio frame number, the subframe number and the pilot sequence number in the subframe, so that the generation modes of the pilot sequences of the time domain symbols of the same radio frame are consistent under different scheduling modes, the interference of the pilot signals of the adjacent regions is randomized, the PUSCH pilot signal sequence can be generated by adopting the same parameters and modes under different scheduling modes, and the realization complexity is reduced. Therefore, the method provided by the embodiment of the invention meets the requirement of setting one or two rows of pilot signals in one subframe, so that when the PUSCH transmits the uplink service, the scheduling of the uplink service by the two scheduling modes can be simultaneously supported.
Drawings
Fig. 1 is a schematic diagram of a time domain frame structure adopted by a power system based on an LTE system provided in the prior art;
fig. 2 is a radio frame timing diagram illustrating a power system based on an LTE system according to the prior art that schedules an uplink service using a radio frame;
fig. 3 is a radio frame timing diagram illustrating a single subframe scheduling uplink service in an LTE system-based power system according to the prior art;
fig. 4 is a flowchart of a method for generating a PUSCH pilot signal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.
In order to meet the requirement of setting one or two rows of pilot signals in one subframe, the method provided by the embodiment of the invention can simultaneously support the scheduling of the uplink service by the two scheduling modes when the PUSCH transmits the uplink service. The two sequences are formed by the radio frame number, the subframe number and the pilot sequence number in the subframe, so that the generation modes of the pilot sequences of the time domain symbols of the same radio frame are consistent under different scheduling modes. Therefore, when pilot signal interference of the adjacent cell is randomized, the PUSCH pilot signal sequence can be generated by adopting the same parameters and modes under different scheduling modes, and the implementation complexity is reduced.
Fig. 4 is a flowchart of a method for generating a PUSCH pilot signal according to an embodiment of the present invention, which includes the following specific steps:
step 401, setting a PUSCH pilot signal sequence;
step 402, generating two sequences of group hopping and cyclic shift factor in the PUSCH pilot signal sequence according to the wireless frame number, the subframe number and the pilot sequence number in the subframe respectively;
step 403, after generating two sequences of the group hop and the cyclic shift factor in the PUSCH pilot signal sequence, generating a PUSCH pilot signal.
In the method, the two-term sequence generation mode of the group of hopping and cyclic shift factors adopts the following formula:
c(8*Nsf*NRS*(nfmod8)+8NRS*nsf+8m'+i)
wherein the content of the first and second substances,
nsfnumbering the uplink sub-frames, and the value range is 0-Nsf-1，NsfThe number of uplink subframes in a wireless frame in an electric power system based on an LTE system;
m' is the pilot frequency time domain symbol number in the sub-frame in the wireless frame, and the value range is 0-NRS-1，NRSThe maximum number of time domain symbols occupied by PUSCH pilot signals in the sub-frame under different PUSCH scheduling modes; specifically, if there is only one row of pilot symbols in each subframe in the wireless frame scheduling manner, m' may be a fixed value, and the fixed value is the same as the value of the row of pilot symbols when there are multiple rows of pilot symbols in the subframe in the single subframe scheduling manner.
nfIs the wireless frame number, and the value range is 0-NsfIs the maximum radio frame number supported by the power system based on the LTE system.
Wherein, the c (i) initializes at the beginning of the first uplink subframe of each radio frame, and is applied in the group hop, and the initialization formula is as follows:
Figure BDA0001774875350000041
applied to twiddle factors, the initialization formula is as follows:
Figure BDA0001774875350000042
Figure BDA0001774875350000043
is the cell ID.
The method described in fig. 4 is adopted to generate a PUSCH pilot signal sequence, that is, a PUSCH pilot signal pseudo-random sequence, and for different PUSCH scheduling modes such as single subframe scheduling, wireless frame scheduling, even two subframe scheduling, and the like, one, two or more rows of pilot signals in a subframe can all use the same random sequence generation mode, and only two sequences of group hopping and cyclic shifting need to be intercepted according to the pilot sequence number in the subframe by the time domain symbol of the used pilot signal, thereby reducing the implementation complexity.
The method described in fig. 4 is adopted to perform frequency offset estimation by using the obtained PUSCH pilot signal.
A power system based on the LTE system will be described in detail as an example.
Pilot signal sequence of PUSCHDefined as a base sequence
Figure BDA0001774875350000045
See equation (1):
Figure BDA0001774875350000046
in the formula (I), the compound is shown in the specification,
Figure BDA0001774875350000047
is a scheduled childThe number of carriers.
Figure BDA0001774875350000048
In the formula (2):
Figure BDA0001774875350000051
the number of subcarriers in each subband is represented, and in the power system, the number of subcarriers is 11;
m' represents the PUSCH pilot symbol number in the sub-frame, and the value range is 0-NRS-1，NRSThe maximum number of time domain symbols occupied by the PUSCH pilot signal in the sub-frame under different PUSCH scheduling modes. If only one row of pilot symbols exists in each subframe in a certain scheduling mode, m' takes a fixed value, and the fixed value is the same as the value of the row of pilot symbols when multiple rows of pilot symbols exist in the subframes in other scheduling modes. In power systems based on LTE systems, NRS2, m' ranges from 0 and 1. Only one row of pilot frequency is arranged in a wireless frame scheduling mode, and the value of the pilot frequency sequence number corresponds to the value 1 of the second row of pilot frequency in two rows of pilot frequencies in a single subframe scheduling mode, so that m' is 1 when the wireless frame scheduling mode is adopted;
Figure BDA0001774875350000052
in the formula (3):
Nsfnumbering the sub-frames, the value range is 0-Nsf-1，NsfIs the number of uplink subframes in the radio frame in the power system, and N is the number of uplink subframes in the power system based on the LTE systemsf＝3；
nfIs the wireless frame number, and the value range is 0-Nf-1，NfIs the number of radio frame number cycles in the power system;
NRSrefer to the description of equation (2).
And c (i) is a pseudo-random sequence, the following formula (10) is generated, initialization can be started at the first uplink subframe of each radio frame, and the initialization formula is as follows:
Figure BDA0001774875350000053
in the formula (4)
Figure BDA0001774875350000054
Is the cell ID.
Figure BDA0001774875350000055
Expressed is a base sequence, generated as in equation (5):
Figure BDA0001774875350000056
wherein the content of the first and second substances,
Figure BDA0001774875350000057
is of length of Zadoff-Chu sequence, is
Figure BDA0001774875350000058
Is the largest of the prime numbers of (a),
Figure BDA0001774875350000059
see formula (1).
The sequence of the Zadoff-Chu of the q-th x is shown in formula (6):
Figure BDA00017748753500000510
in equation (6):
Figure BDA00017748753500000511
q is generated as shown in equation (7):
Figure BDA00017748753500000513
in formula (7): u denotes a group hop sequence number.
u＝(fgh(nf,nsf)+fss)mod10 (8)
Wherein:
in formula (9), c (i) is a pseudo-random sequence, and the specific calculation method is shown in formula (10), and can adopt
Figure BDA0001774875350000062
Initialization is performed.
The other parameters in equation (9) refer to the description of equation (3).
In power systems based on LTE systems, the pseudo-random sequence c (i) is generated from a Gold sequence of length 31. Length MPNThe output sequence c (n) (0, 1., M)PN-1), defined as:
Figure BDA0001774875350000063
wherein N isC1600, the first m-sequence should be initialized to x1(0)＝1,x1(n) ═ 0, n ═ 1,2, 30. The second m-sequence is represented by
Figure BDA0001774875350000064
Initialization is performed with values that depend on the specific application of the sequence.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A method for generating a Physical Uplink Shared Channel (PUSCH) pilot signal is characterized by comprising the following steps:
setting a PUSCH pilot signal sequence for frequency offset estimation;
generating two sequences of group hopping and cyclic shift factors in a PUSCH pilot signal sequence according to a wireless frame number, a subframe number and a pilot sequence number in a subframe respectively;
and generating two sequences of group hopping and cyclic shift factors in the PUSCH pilot signal sequence, and then generating the PUSCH pilot signal.
2. The generation method of claim 1, wherein the two-term sequence of group hopping and cyclic shift factors is generated using the following formula:
c(8*Nsf*NRS*(nfmod8)+8NRS*nsf+8m'+i)
wherein the content of the first and second substances,
nsfnumbering the uplink sub-frames, and the value range is 0-Nsf-1，NsfThe number of uplink subframes in a wireless frame in a power system based on a Long Term Evolution (LTE) system;
m' is the pilot frequency time domain symbol number in the sub-frame in the wireless frame, and the value range is 0-NRS-1；
NRSThe maximum number of time domain symbols occupied by PUSCH pilot signals in the sub-frame under different PUSCH scheduling modes;
nfthe value range is 0-the maximum wireless frame number supported by the power system based on the LTE system.
3. The method of claim 2, wherein in the radio frame scheduling mode, there is only one row of pilot symbols in each subframe, m' is a fixed value, and the fixed value is the same as the row of pilot symbols in the subframes in the single subframe scheduling mode.
4. The method of claim 2, wherein the process of generating the PUSCH pilot signal is:
pilot signal sequence of PUSCH
Figure FDA0001774875340000011
Defined as a base sequenceCyclic shift of (a), as in equation (1):
Figure FDA0001774875340000013
in the formula (I), the compound is shown in the specification,
Figure FDA0001774875340000014
Figure FDA0001774875340000015
is the number of scheduled sub-carriers;
α -cyclic shift factor, the generation mode is shown in formula (2):
Figure FDA0001774875340000016
in formula (2):
Figure FDA0001774875340000017
representing the number of subcarriers in each subband;
Figure FDA0001774875340000018
according to cell IDObtaining;
Figure FDA00017748753400000110
wherein, in formula (3), c (i) is a pseudo random sequence;
expressed is a base sequence, generated as in equation (5):
Figure FDA0001774875340000022
wherein, in the formula (5),
Figure FDA0001774875340000023
is of length of Zadoff-Chu sequence, is
Figure FDA0001774875340000024
The largest prime number of;
the Zadoff-Chu sequence for the qth x is shown in equation (6):
Figure FDA0001774875340000025
in equation (6):
Figure FDA0001774875340000026
q is generated as shown in equation (7):
in formula (7): u denotes a group hop sequence number.
u＝(fgh(nf,nsf)+fss)mod10 (8)
Wherein:
Figure FDA0001774875340000028
wherein, in formula (9), c (i) is a pseudo random sequence.
5. The method of claim 4, wherein c (i) is generated from a length-31 Gold sequence, length MPNThe output sequence c (n) (0, 1., M)PN-1), defined as:
wherein N isC1600, the first m-sequence should be initialized to x1(0)＝1,x1(n) ═ 0, n ═ 1,2, 30. The second m-sequence is expressed by
Figure FDA00017748753400000210
And calculating, wherein the specific numerical value is defined according to the specific application of the sequence.
6. The method of claim 2, wherein c (i) is initialized in a group hop beginning at the first uplink subframe of each radio frame, and wherein the initialization formula is as follows:
Figure FDA00017748753400000211
applied to twiddle factors, the initialization formula is as follows:
Figure FDA00017748753400000213
Figure FDA00017748753400000214
is the cell ID.
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