CN112449427B - Data transmission method of multi-sub-band communication system, electronic equipment and storage medium - Google Patents

Data transmission method of multi-sub-band communication system, electronic equipment and storage medium Download PDF

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Publication number
CN112449427B
CN112449427B CN201910836408.5A CN201910836408A CN112449427B CN 112449427 B CN112449427 B CN 112449427B CN 201910836408 A CN201910836408 A CN 201910836408A CN 112449427 B CN112449427 B CN 112449427B
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time slot
frame structure
sub
slot
communication system
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CN112449427A (en
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龚秋莎
王栋
冯绍鹏
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Potevio Information Technology Co Ltd
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Potevio Information Technology Co Ltd
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    • 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
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The embodiment of the invention provides a data transmission method, electronic equipment and storage medium of a multi-sub-band communication system, wherein the method comprises the following steps: scheduling the target terminal to a sub-band adopting a preset wireless frame structure; based on the preset radio frame structure, sending data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode; the preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz. According to the data transmission method of the multi-sub communication system, which is provided by the embodiment of the invention, the data transmission is carried out based on the 20ms frame structure, so that the related channel occupation resources of the multi-sub communication system in the truncated mode are multiple times of those of the existing mode, the transmission performance is improved when the channel environment is poor, the possibility of data retransmission and link retransmission is reduced, and the requirement of low-delay service is further met.

Description

Data transmission method of multi-sub-band communication system, electronic equipment and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method, an electronic device, and a storage medium of a multi-subsystem communication system.
Background
The authorized frequency points of the 230MHz multi-sub-band communication system are discretely distributed on the frequency band of 223.525 MHz-231.65 MHz, and each bandwidth is 25KHz and is called a physical sub-band. The corresponding frame structure design is shown in fig. 1, where the downlink and uplink transmissions are within a radio frame of duration tf=600×ts=10 ms. A radio frame comprises 5 time slots of length 120×ts, numbered 0 to 4. The slot 2 is a special slot, and is composed of DwPTS (downlink pilot time slot), GP (guard interval) and UpPTS (uplink pilot time slot). The lengths of DwPTS, GP and UpPTS are 20×ts,40×ts and 60×ts, respectively.
For subcarrier spacing Δf=3.75 kHz, the downlink subframes in a radio frame are defined as slot 0 and slot 1, and the uplink subframes in a radio frame are defined as slot 3 and slot 4. Timeslots 0 and 1 and DwPTS are always used for downlink transmission. UpPTS and slots 3 and 4 are always used for uplink transmission. As shown in fig. 2, a physical resource block structure of the conventional multi-sub-band communication system is schematically shown. Each slot contains 6 OFDM (orthogonal frequency division multiplexing) symbols with a subcarrier spacing Δf=3.75 kHz with 6 subcarriers in each 25kHz subband.
In order to meet the low-delay service requirement, the PUCCH (physical uplink control channel) and the PDSCH (physical downlink shared channel) are transmitted in a puncturing mode, and in the puncturing mode, the PUCCH occupies the last 3 symbols of a time slot 3 in a frame and the whole time slot 4, and the total number of the PUCCH is 54 RE (resource elements); PDSCH occupies the first 3 symbols of slot 1 and the entire slot 0 in one frame for a total of 54 REs. Due to limited resources, when the channel environment is poor, the terminal can not correctly demodulate and receive the PDSCH data belonging to the terminal in the current subframe, so that the PDSCH retransmission is caused, and the time delay is increased. Under the condition of no scheduling, if the PUCCH demodulation is wrong, the combination of new and old data can cause the link interruption. Therefore, in the truncated mode, the data transmission method based on the existing frame structure cannot meet the requirement of low-delay service.
Disclosure of Invention
Embodiments of the present invention provide a data transmission method, an electronic device, and a storage medium of a multi-sub-band communication system that overcome or at least partially solve the above-mentioned problems.
In a first aspect, an embodiment of the present invention provides a data transmission method of a multi-sub-band communication system, including:
scheduling the target terminal to a sub-band adopting a preset wireless frame structure;
Based on the preset radio frame structure, sending data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode;
The preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
The frame length of the preset wireless frame structure is 20ms, and the sub-band comprises 12 sub-carriers.
The preset radio frame structure comprises 5 time slots, each time slot comprises 6 OFDM symbols, wherein a downlink subframe is formed by a first time slot and a second time slot, a third time slot is a special time slot, an uplink subframe is formed by a fourth time slot and a fifth time slot, the third time slot is formed by a downlink pilot time slot DwPTS, a guard interval GP and an uplink pilot time slot UpPTS, the first time slot, the second time slot and the DwPTS are used for downlink transmission, and the UpPTS, the fourth time slot and the fifth time slot are used for uplink transmission.
Further, the physical downlink shared channel PDSCH occupies N consecutive symbols in the preset radio frame structure, where the N consecutive symbols consist of all symbols of the first slot and part of symbols of the second slot, where N is greater than or equal to 6 and less than or equal to 12.
In a second aspect, an embodiment of the present invention provides a data transmission method of a multi-sub-band communication system, including:
Determining a preset wireless frame structure corresponding to the occupied sub-band;
Based on the preset radio frame structure, sending data to be transmitted to a base station through a Physical Uplink Control Channel (PUCCH) in a puncturing mode;
The preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
The frame length of the preset wireless frame structure is 20ms, and the sub-band comprises 12 sub-carriers.
The preset radio frame structure comprises 5 time slots, each time slot comprises 6 OFDM symbols, wherein a downlink subframe is formed by a first time slot and a second time slot, a third time slot is a special time slot, an uplink subframe is formed by a fourth time slot and a fifth time slot, the third time slot is formed by a downlink pilot time slot DwPTS, a guard interval GP and an uplink pilot time slot UpPTS, the first time slot, the second time slot and the DwPTS are used for downlink transmission, and the UpPTS, the fourth time slot and the fifth time slot are used for uplink transmission.
Further, the physical uplink control channel PUCCH occupies M consecutive symbols in the preset radio frame structure, where the M consecutive symbols consist of a part of symbols in the fourth slot and all symbols in the fifth slot, where M is greater than or equal to 6 and less than or equal to 12.
In a third aspect, an embodiment of the present invention provides a base station, including:
the scheduling module is used for scheduling the target terminal to the sub-band adopting the preset wireless frame structure;
The data transmission module is used for transmitting data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode based on the preset wireless frame structure;
The preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
In a fourth aspect, an embodiment of the present invention provides a terminal device, including:
the frame structure determining module is used for determining a preset wireless frame structure corresponding to the occupied sub-band;
The data transmitting module is used for transmitting data to be transmitted to a base station through a Physical Uplink Control Channel (PUCCH) in a puncturing mode based on the preset wireless frame structure;
The preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
In a fifth aspect, an embodiment of the present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the data transmission method of the multi-sub-band communication system as provided in the first or second aspect when the program is executed.
In a sixth aspect, embodiments of the present invention provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a data transmission method of a multi-subsystem communication system as provided in the first or second aspect.
According to the data transmission method, the electronic device and the storage medium of the multi-sub communication system, which are provided by the embodiment of the invention, the data transmission is performed based on the 20ms frame structure, so that the PUCCH and the PDSCH of the multi-sub communication system occupy multiple times of the existing mode in the shortened mode, the transmission performance is improved when the channel environment is poor, the possibility of data retransmission and link retransmission is reduced, and the requirement of low-delay service is further met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a radio frame structure in a conventional multi-sub-band communication system;
Fig. 2 is a schematic diagram of a physical resource block structure of a conventional multi-sub-band communication system;
Fig. 3 is a flow chart of a data transmission method of a multi-subsystem communication system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a radio frame structure according to an embodiment of the present invention;
Fig. 5 is a flow chart of a data transmission method of a multi-sub-band communication system according to another embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;
Fig. 8 is a schematic diagram of an entity structure of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 3, a flow chart of a data transmission method of a multi-subsystem communication system according to an embodiment of the present invention includes:
Step 100, scheduling a target terminal to a sub-band adopting a preset wireless frame structure;
specifically, the execution subject of the embodiment of the present invention is a base station. In order to meet the requirement of low-delay service, the Physical Uplink Control Channel (PUCCH) and the Physical Downlink Shared Channel (PDSCH) of the multi-sub-band communication system perform data transmission in a puncturing mode, in the puncturing mode, the PUCCH and the PDSCH occupy limited resources, and when the channel environment is poor, the transmission performance is lower.
The base station can obtain the coverage grade of the terminal and the service type of the terminal through initial access, and if the current channel environment is poor and the service type of the terminal is low-delay service, the scheduling terminal works on a sub-band adopting a preset radio frame structure.
In the embodiment of the present invention, the preset radio frame structure is determined according to the subcarrier spacing of the subband, where the subcarrier spacing of the subband is specifically 1.875kHz.
Specifically, based on the subcarrier spacing of the subbands and the bandwidths of the subbands, the number of subcarriers of the subbands and the time unit Ts of the radio frame structure can be determined, and further, on the basis of being compatible with the radio frame structure of the existing 230MHz multi-subcarrier communication system, a preset radio frame structure can be obtained.
Step 101, based on the preset radio frame structure, sending data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode;
Specifically, the base station sends data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode based on the preset radio frame structure. The data to be transmitted is specifically RRC related signaling, SIB, paging message, downlink user data, or the like.
The physical downlink shared channel PDSCH in the puncturing mode occupies at least 72 REs for data transmission, and the number of subcarriers of the radio frame structure in the embodiment of the invention is twice that of the existing 230MHz multi-subcarrier communication system, i.e. 12 subcarriers, and one time slot includes 6 OFDM symbols, so that the physical downlink shared channel PDSCH in the puncturing mode occupies at least more resources than the physical downlink shared channel PDSCH in the puncturing mode of the existing 230MHz multi-subcarrier communication system, which occupies 54 REs, thereby improving the transmission performance of the PDSCH in the case of poor channel environment.
It should be noted that, if the current channel environment is better, or the service type of the terminal is not a low-delay service, the base station schedules the terminal to work on the sub-band of the radio frame structure adopting the existing 230MHz multi-sub-band communication system.
The data transmission method of the multi-sub-band communication system provided by the embodiment of the invention can enable the PDSCH of the multi-sub-band communication system to occupy multiple resources than the prior art in a truncated mode, thereby improving the transmission performance when the channel environment is poor, reducing the possibility of data retransmission and link retransmission, and further meeting the requirement of low-delay service.
Based on the foregoing embodiment, the frame length of the preset radio frame structure is 20ms, and the sub-band includes 12 sub-carriers.
Specifically, 1.875kHz is one half of the subcarrier spacing (Δf=3.75 kHz) of the existing 230MHz multi-subband communication system, and since the bandwidth of each subband of the 230MHz multi-subband communication system is 25kHz, each subband in the embodiment of the present invention contains 12 subcarriers.
Because the time unit Ts of the frame structure is inversely proportional to the subcarrier spacing, the time unit of the radio frame structure in the embodiment of the invention is twice the time unit of the radio frame structure in the existing 230MHz multi-subcarrier communication system, and on the basis of the existing frame structure, the frame length of the radio frame structure in the embodiment of the invention is twice the frame length of the radio frame structure of the existing 230MHz multi-subcarrier communication system, namely 20ms.
Based on the foregoing embodiments, the preset radio frame structure includes 5 slots, each slot includes 6 OFDM symbols, where a first slot and a second slot form a downlink subframe, a third slot is a special slot, a fourth slot and a fifth slot form an uplink subframe, the third slot is formed by a downlink pilot time slot DwPTS, a guard interval GP, and an uplink pilot time slot UpPTS, the first slot, the second slot, and the DwPTS are used for downlink transmission, and UpPTS, the fourth slot, and the fifth slot are used for uplink transmission.
Specifically, as shown in fig. 4, a schematic diagram of a radio frame structure according to an embodiment of the present invention is shown. The preset radio frame structure includes 5 time slots, each time slot having a length of 240×ts, where ts=1/60000 seconds.
Each slot corresponds to 6 OFDM symbols in the time domain and each slot corresponds to 12 subcarriers in the frequency domain.
The number of the time slot in the wireless frame structure is from 0 to 4, wherein the time slot 2 is a special time slot, the time slot 2 consists of a downlink pilot time slot DwPTS, a guard interval GP and an uplink pilot time slot UpPTS, wherein the length of the downlink pilot time slot DwPTS is 40 xTs, the length of the guard interval GP is 80 xTs, and the length of the uplink pilot time slot UpPTS is 120 xTs.
Time slot 0 and time slot 1 constitute a downlink subframe, and time slot 0, time slot 1, and DwPTS are always used for downlink transmission.
Time slot 3 and time slot 4 constitute an uplink subframe, and UpPTS, time slot 3, and time slot 4 are always used for uplink transmission.
Based on the above embodiments, the physical downlink shared channel PDSCH occupies N consecutive symbols in the preset radio frame structure, where the N consecutive symbols consist of all symbols of the first slot and part of symbols of the second slot, where N is greater than or equal to 6 and less than or equal to 12.
Specifically, N is a natural number of 6 or more and 12 or less.
In one embodiment, the PDSCH occupies the first 3 symbols of the entire time slot 0 and the time slot 1 in a frame of the radio frame structure, that is, the PDSCH occupies 9 continuous symbols in the preset radio frame structure, so that the PDSCH occupies 9×12=108 REs in total, the REs are resource elements, one OFDM symbol corresponds to in the time domain, one subcarrier corresponds to in the frequency domain, at this time, the PDSCH occupies 2 times of the resources of the existing mode, and a 3dB gain can be obtained in performance.
In one embodiment, PDSCH occupies 0 symbols of the entire slot 0 and slot 1 in one frame of the radio frame structure, i.e. PDSCH occupies 6 consecutive symbols in the preset radio frame structure, so PDSCH occupies 6×12=72 REs in total, and at this time, PDSCH occupies 1.33 times of the existing resources.
In one embodiment, PDSCH occupies the whole time slot 1 and the whole time slot 0 in one frame of the radio frame structure, that is, PDSCH occupies 12×12=144 REs in total, and at this time, PDSCH occupies 2.7 times of the existing mode, so that 4dB gain can be obtained in performance.
The value of N can be determined according to the actual channel environment, so that the transmission performance of the PDSCH in the truncated mode is improved more effectively.
As shown in fig. 5, a flow chart of a data transmission method of a multi-subsystem communication system according to another embodiment of the present invention includes:
step 200, determining a preset wireless frame structure corresponding to the occupied sub-band;
specifically, the execution subject of the embodiment of the present invention is a terminal. When the base station knows that the current channel environment is poor and the service type of the terminal is low-delay service, the terminal is scheduled to work on a sub-band adopting a preset wireless frame structure, and before data transmission, the terminal determines the wireless frame structure corresponding to the sub-band on which the terminal works.
The preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
Specifically, based on the subcarrier spacing of the subbands and the bandwidths of the subbands, the number of subcarriers of the subbands and the time unit Ts of the radio frame structure can be determined, and further, on the basis of being compatible with the radio frame structure of the existing 230MHz multi-subcarrier communication system, a preset radio frame structure can be obtained.
Step 201, based on the preset radio frame structure, sending data to be transmitted to a base station through a physical uplink control channel PUCCH in a puncturing mode;
Specifically, the terminal sends data to be transmitted to the base station through a Physical Uplink Control Channel (PUCCH) in a puncturing mode based on the preset wireless frame structure; wherein, the data to be transmitted is CQI, ACK/NAK feedback or scheduling request, etc.
The physical uplink control channel PUCCH in the puncturing mode occupies at least 72 REs for data transmission, and the subcarrier interval of the radio frame structure in the embodiment of the present invention is half of that of the existing 230MHz multi-subcarrier communication system, so that the number of subcarriers is twice of that of the existing 230MHz multi-subcarrier communication system, i.e. 12, and one slot includes 6 OFDM symbols, so that the physical uplink control channel PUCCH in the puncturing mode occupies at least 72 REs, which is more than the resources of the physical uplink control channel PUCCH in the puncturing mode of the existing 230MHz multi-subcarrier communication system, which occupies 54 REs, thereby improving the transmission performance of the PUCCH in the case of poor channel environment.
The data transmission method of the multi-sub communication system provided by the embodiment of the invention can enable the PUCCH of the multi-sub communication system to occupy multiple resources than the existing mode in a truncated mode, thereby improving the transmission performance when the channel environment is poor, reducing the possibility of data retransmission and link retransmission and further meeting the requirement of low-delay service.
Based on the foregoing embodiment, the frame length of the preset radio frame structure is 20ms, and the sub-band includes 12 sub-carriers.
Specifically, 1.875kHz is one half of the subcarrier spacing (Δf=3.75 kHz) of the existing 230MHz multi-subband communication system, and since the bandwidth of each subband of the 230MHz multi-subband communication system is 25kHz, each subband in the embodiment of the present invention contains 12 subcarriers.
Because the time unit Ts of the frame structure is inversely proportional to the subcarrier spacing, the time unit of the radio frame structure in the embodiment of the invention is twice the time unit of the radio frame structure in the existing 230MHz multi-subcarrier communication system, and on the basis of the existing frame structure, the frame length of the radio frame structure in the embodiment of the invention is twice the frame length of the radio frame structure of the existing 230MHz multi-subcarrier communication system, namely 20ms.
Based on the foregoing embodiments, the preset radio frame structure includes 5 slots, each slot includes 6 OFDM symbols, where a first slot and a second slot form a downlink subframe, a third slot is a special slot, a fourth slot and a fifth slot form an uplink subframe, the third slot is formed by a downlink pilot time slot DwPTS, a guard interval GP, and an uplink pilot time slot UpPTS, the first slot, the second slot, and the DwPTS are used for downlink transmission, and UpPTS, the fourth slot, and the fifth slot are used for uplink transmission.
Specifically, as shown in fig. 4, the preset radio frame structure includes 5 slots, each having a length of 240×ts, where ts=1/60000 seconds.
Each slot corresponds to 6 OFDM symbols in the time domain and each slot corresponds to 12 subcarriers in the frequency domain.
And the number of the time slot in the wireless frame structure is from 0 to 4, wherein the time slot 2 is a special time slot, and the time slot 2 consists of a downlink pilot time slot DwPTS, a guard interval GP and an uplink pilot time slot UpPTS. Wherein, the downlink pilot time slot DwPTS length is 40 xTs, the guard interval GP length is 80 xTs, and the uplink pilot time slot UpPTS length is 120 xTs.
Time slot 0 and time slot 1 constitute a downlink subframe, and time slot 0, time slot 1, and DwPTS are always used for downlink transmission.
Time slot 3 and time slot 4 constitute an uplink subframe, and UpPTS, time slot 3, and time slot 4 are always used for uplink transmission.
Based on the above embodiments, the physical uplink control channel PUCCH occupies M consecutive symbols in the preset radio frame structure, where the M consecutive symbols consist of a part of symbols in the fourth slot and all symbols in the fifth slot, where M is greater than or equal to 6 and less than or equal to 12.
Specifically, M is a natural number of 6 or more and 12 or less.
In one embodiment, the PUCCH occupies the last 3 symbols of the slot 3 in a frame of the radio frame structure and the entire slot 4, that is, the PUCCH occupies 9 continuous symbols in the preset radio frame structure, so that the PUCCH occupies 9×12=108 REs in total, the REs are resource elements, one OFDM symbol corresponds to the time domain, one subcarrier corresponds to the frequency domain, at this time, the PUCCH occupies 2 times of the resources of the existing mode, and a 3dB gain can be obtained in performance.
In one embodiment, the PUCCH occupies 0 symbols of slot 3 and the entire slot 4 in a frame of the radio frame structure, that is, the PUCCH occupies 6 consecutive symbols in the preset radio frame structure, so that the PUCCH occupies 6×12=72 REs in total, and at this time, the PUCCH occupies 1.33 times of the resource in the existing manner.
In one embodiment, the PUCCH occupies the entire slot 3 and the entire slot 4 in one frame of the radio frame structure, that is, the PUCCH occupies 12 consecutive symbols in the preset radio frame structure, so that the PUCCH occupies 12×12=144 REs in total, and at this time, the PUCCH occupies 2.7 times of the resource in the existing manner, and a 4dB gain can be obtained in performance.
The value of M can be determined according to the actual channel environment, so that the transmission performance of the PDSCH in the truncated mode is improved more effectively.
According to the data transmission method of the multi-sub communication system, which is provided by the embodiment of the invention, the data transmission is carried out based on the 20ms frame structure, so that the PUCCH and PDSCH of the multi-sub communication system occupy multiple times of the existing mode in the truncated mode, the transmission performance is improved when the channel environment is poor, the possibility of data retransmission and link retransmission is reduced, and the requirement of low-delay service is further met.
The embodiment of the invention also provides a base station, as shown in fig. 6, which is a schematic structural diagram of the base station provided by the embodiment of the invention, including: a scheduling module 601 and a data transmission module 602, wherein,
A scheduling module 601, configured to schedule a target terminal to a subband adopting a preset radio frame structure;
specifically, the scheduling module 601 may obtain the coverage level of the terminal and the service type of the terminal through initial access, and if it is known that the current channel environment is poor and the service type of the terminal is low-delay service, the scheduling terminal works on a subband adopting a preset radio frame structure.
In the embodiment of the present invention, the preset radio frame structure is determined according to the subcarrier spacing of the subband, where the subcarrier spacing of the subband is specifically 1.875kHz.
Specifically, based on the subcarrier spacing of the subbands and the bandwidths of the subbands, the number of subcarriers of the subbands and the time unit Ts of the radio frame structure can be determined, and further, on the basis of being compatible with the radio frame structure of the existing 230MHz multi-subcarrier communication system, a preset radio frame structure can be obtained.
The radio frame structure provided by the embodiment of the invention can enable the PUCCH and the PDSCH to obtain more resources in the truncated mode and reduce the channel demodulation threshold, thereby meeting the requirement of low-delay service.
The data transmission module 602 is configured to send data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode based on the preset radio frame structure;
Specifically, the data to be transmitted is specifically RRC related signaling, SIB, paging message, downlink user data, or the like.
The physical downlink shared channel PDSCH in the puncturing mode occupies at least 72 REs for data transmission, and the number of subcarriers of the radio frame structure in the embodiment of the invention is twice that of the existing 230MHz multi-subcarrier communication system, i.e. 12 subcarriers, and one time slot includes 6 OFDM symbols, so that the physical downlink shared channel PDSCH in the puncturing mode occupies at least more resources than the physical downlink shared channel PDSCH in the puncturing mode of the existing 230MHz multi-subcarrier communication system, which occupies 54 REs, thereby improving the transmission performance of the PDSCH in the case of poor channel environment.
It should be noted that, if the current channel environment is better, or the service type of the terminal is not a low-delay service, the scheduling module 601 schedules the terminal to work on a subband of a radio frame structure adopting the existing 230MHz multi-subband communication system.
The base station provided by the embodiment of the invention can ensure that the PDSCH of the multi-sub communication system occupies multiple resources compared with the prior art in the truncated mode, thereby improving the transmission performance when the channel environment is poor, reducing the possibility of data retransmission and link retransmission and further meeting the requirement of low-delay service.
The frame length of the preset wireless frame structure is 20ms, and the sub-band comprises 12 sub-carriers.
The preset radio frame structure comprises 5 time slots, each time slot comprises 6 OFDM symbols, wherein a downlink subframe is formed by a first time slot and a second time slot, a third time slot is a special time slot, an uplink subframe is formed by a fourth time slot and a fifth time slot, the third time slot is formed by a downlink pilot time slot DwPTS, a guard interval GP and an uplink pilot time slot UpPTS, the first time slot, the second time slot and the DwPTS are used for downlink transmission, and the UpPTS, the fourth time slot and the fifth time slot are used for uplink transmission.
The physical downlink shared channel PDSCH occupies continuous N symbols in the preset radio frame structure, where the continuous N symbols consist of all symbols of the first time slot and part of symbols of the second time slot, and N is greater than or equal to 6 and less than or equal to 12.
Specifically, N is a natural number of 6 or more and 12 or less.
In one embodiment, the PDSCH occupies the first 3 symbols of the entire time slot 0 and the time slot 1 in a frame of the radio frame structure, that is, the PDSCH occupies 9 continuous symbols in the preset radio frame structure, so that the PDSCH occupies 9×12=108 REs in total, the REs are resource elements, one OFDM symbol corresponds to in the time domain, one subcarrier corresponds to in the frequency domain, at this time, the PDSCH occupies 2 times of the resources of the existing mode, and a 3dB gain can be obtained in performance.
In one embodiment, PDSCH occupies 0 symbols of the entire slot 0 and slot 1 in one frame of the radio frame structure, i.e. PDSCH occupies 6 consecutive symbols in the preset radio frame structure, so PDSCH occupies 6×12=72 REs in total, and at this time, PDSCH occupies 1.33 times of the existing resources.
In one embodiment, PDSCH occupies the whole time slot 1 and the whole time slot 0 in one frame of the radio frame structure, that is, PDSCH occupies 12×12=144 REs in total, and at this time, PDSCH occupies 2.7 times of the existing mode, so that 4dB gain can be obtained in performance.
The value of N can be determined according to the actual channel environment, so that the transmission performance of the PDSCH in the truncated mode is improved more effectively.
The embodiment of the invention also provides a terminal device, as shown in fig. 7, which is a schematic structural diagram of the terminal device provided by the embodiment of the invention, including: a frame structure determination module 701, and a data transmission module 702, wherein,
A frame structure determining module 701, configured to determine a preset radio frame structure corresponding to an occupied sub-band;
Specifically, when the base station knows that the current channel environment is poor and the service type of the terminal is low-delay service, the terminal is scheduled to work on a sub-band adopting a preset wireless frame structure, and before data transmission, the terminal determines the wireless frame structure corresponding to the sub-band on which the terminal works.
The preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
Specifically, based on the subcarrier spacing of the subbands and the bandwidths of the subbands, the number of subcarriers of the subbands and the time unit Ts of the radio frame structure can be determined, and further, on the basis of being compatible with the radio frame structure of the existing 230MHz multi-subcarrier communication system, a preset radio frame structure can be obtained.
A data sending module 702, configured to send data to be transmitted to a base station through a physical uplink control channel PUCCH in a puncturing mode based on the preset radio frame structure;
specifically, the data sending module 702 sends, based on the preset radio frame structure, data to be transmitted to a base station through a physical uplink control channel PUCCH in a puncturing mode; wherein, the data to be transmitted is CQI, ACK/NAK feedback or scheduling request, etc.
The physical uplink control channel PUCCH in the puncturing mode occupies at least 72 REs for data transmission, and the subcarrier interval of the radio frame structure in the embodiment of the present invention is half of that of the existing 230MHz multi-subcarrier communication system, so that the number of subcarriers is twice of that of the existing 230MHz multi-subcarrier communication system, i.e. 12, and one slot includes 6 OFDM symbols, so that the physical uplink control channel PUCCH in the puncturing mode occupies at least 72 REs, which is more than the resources of the physical uplink control channel PUCCH in the puncturing mode of the existing 230MHz multi-subcarrier communication system, which occupies 54 REs, thereby improving the transmission performance of the PUCCH in the case of poor channel environment.
The terminal equipment provided by the embodiment of the invention can ensure that the PUCCH of the multi-sub communication system occupies multiple times of the prior mode in the truncated mode, thereby improving the transmission performance when the channel environment is poor, reducing the possibility of data retransmission and link retransmission and further meeting the requirement of low-delay service.
Based on the foregoing embodiment, the frame length of the preset radio frame structure is 20ms, and the sub-band includes 12 sub-carriers.
Based on the foregoing embodiments, the preset radio frame structure includes 5 slots, each slot includes 6 OFDM symbols, where a first slot and a second slot form a downlink subframe, a third slot is a special slot, a fourth slot and a fifth slot form an uplink subframe, the third slot is formed by a downlink pilot time slot DwPTS, a guard interval GP, and an uplink pilot time slot UpPTS, the first slot, the second slot, and the DwPTS are used for downlink transmission, and UpPTS, the fourth slot, and the fifth slot are used for uplink transmission.
Based on the above embodiments, the physical uplink control channel PUCCH occupies M consecutive symbols in the preset radio frame structure, where the M consecutive symbols consist of a part of symbols in the fourth slot and all symbols in the fifth slot, where M is greater than or equal to 6 and less than or equal to 12.
Specifically, M is a natural number of 6 or more and 12 or less.
In one embodiment, the PUCCH occupies the last 3 symbols of the slot 3 in a frame of the radio frame structure and the entire slot 4, that is, the PUCCH occupies 9 continuous symbols in the preset radio frame structure, so that the PUCCH occupies 9×12=108 REs in total, the REs are resource elements, one OFDM symbol corresponds to the time domain, one subcarrier corresponds to the frequency domain, at this time, the PUCCH occupies 2 times of the resources of the existing mode, and a 3dB gain can be obtained in performance.
In one embodiment, the PUCCH occupies 0 symbols of slot 3 and the entire slot 4 in a frame of the radio frame structure, that is, the PUCCH occupies 6 consecutive symbols in the preset radio frame structure, so that the PUCCH occupies 6×12=72 REs in total, and at this time, the PUCCH occupies 1.33 times of the resource in the existing manner.
In one embodiment, the PUCCH occupies the entire slot 3 and the entire slot 4 in one frame of the radio frame structure, that is, the PUCCH occupies 12 consecutive symbols in the preset radio frame structure, so that the PUCCH occupies 12×12=144 REs in total, and at this time, the PUCCH occupies 2.7 times of the resource in the existing manner, and a 4dB gain can be obtained in performance.
The value of M can be determined according to the actual channel environment, so that the transmission performance of the PDSCH in the truncated mode is improved more effectively.
Fig. 8 is a schematic diagram of an entity structure of an electronic device according to an embodiment of the present invention, as shown in fig. 8, the electronic device may include: processor 810, communication interface (Communications Interface) 820, memory 830, and communication bus 840, wherein processor 810, communication interface 820, memory 830 accomplish communication with each other through communication bus 840. The processor 810 may invoke a computer program stored in the memory 830 and executable on the processor 810 to perform the data transmission method of the multi-subsystem communication system provided by the above method embodiments, for example, including: scheduling the target terminal to a sub-band adopting a preset wireless frame structure; based on the preset radio frame structure, sending data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode; the preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
The processor 810 may invoke a computer program stored in the memory 830 and executable on the processor 810 to perform the data transmission method of the multi-subsystem communication system provided by the above method embodiments, for example, including: determining a preset wireless frame structure corresponding to the occupied sub-band; based on the preset radio frame structure, sending data to be transmitted to a base station through a Physical Uplink Control Channel (PUCCH) in a puncturing mode; the preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
Further, the logic instructions in the memory 830 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art or a part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The embodiments of the present invention further provide a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements a data transmission method of a multi-sub-band communication system provided in the above method embodiments, for example, including: scheduling the target terminal to a sub-band adopting a preset wireless frame structure; based on the preset radio frame structure, sending data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode; the preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
The embodiments of the present invention further provide a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements a data transmission method of a multi-sub-band communication system provided in the above method embodiments, for example, including: determining a preset wireless frame structure corresponding to the occupied sub-band; based on the preset radio frame structure, sending data to be transmitted to a base station through a Physical Uplink Control Channel (PUCCH) in a puncturing mode; the preset wireless frame structure is determined according to the subcarrier interval of the subband, and the subcarrier interval of the subband is 1.875kHz.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. A data transmission method of a multi-sub-band communication system, comprising:
scheduling the target terminal to a sub-band adopting a preset wireless frame structure;
Based on the preset radio frame structure, sending data to be transmitted to the target terminal through a physical downlink shared channel PDSCH in a puncturing mode;
the preset wireless frame structure is determined according to the subcarrier interval of the subband, wherein the subcarrier interval of the subband is 1.875kHz;
the frame length of the preset wireless frame structure is 20ms, and 12 subcarriers are contained in the sub-band;
The preset radio frame structure comprises 5 time slots, each time slot comprises 6 OFDM symbols, wherein a downlink subframe is formed by a first time slot and a second time slot, a third time slot is a special time slot, an uplink subframe is formed by a fourth time slot and a fifth time slot, the third time slot is formed by a downlink pilot time slot DwPTS, a guard interval GP and an uplink pilot time slot UpPTS, the first time slot, the second time slot and the DwPTS are used for downlink transmission, and the UpPTS, the fourth time slot and the fifth time slot are used for uplink transmission.
2. The method for data transmission in a multi-sub-band communication system according to claim 1, wherein the physical downlink shared channel PDSCH occupies N consecutive symbols in the preset radio frame structure, the N consecutive symbols being composed of all symbols of the first slot and a portion of symbols of the second slot, wherein N is 6.ltoreq.12.
3. A data transmission method of a multi-sub-band communication system, comprising:
Determining a preset wireless frame structure corresponding to the occupied sub-band;
Based on the preset radio frame structure, sending data to be transmitted to a base station through a Physical Uplink Control Channel (PUCCH) in a puncturing mode;
the preset wireless frame structure is determined according to the subcarrier interval of the subband, wherein the subcarrier interval of the subband is 1.875kHz;
the frame length of the preset wireless frame structure is 20ms, and 12 subcarriers are contained in the sub-band;
The preset radio frame structure comprises 5 time slots, each time slot comprises 6 OFDM symbols, wherein a downlink subframe is formed by a first time slot and a second time slot, a third time slot is a special time slot, an uplink subframe is formed by a fourth time slot and a fifth time slot, the third time slot is formed by a downlink pilot time slot DwPTS, a guard interval GP and an uplink pilot time slot UpPTS, the first time slot, the second time slot and the DwPTS are used for downlink transmission, and the UpPTS, the fourth time slot and the fifth time slot are used for uplink transmission.
4. The data transmission method of the multi-sub communication system according to claim 3, wherein the physical uplink control channel PUCCH occupies M consecutive symbols in the preset radio frame structure, the M consecutive symbols being composed of a part of symbols in the fourth slot and all symbols in the fifth slot, wherein 6.ltoreq.m.ltoreq.12.
5. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the data transmission method of the multi-sub-band communication system according to any of claims 1 to 4 when the program is executed.
6. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the data transmission method of a multi-sub-band communication system according to any of claims 1 to 4.
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