CN111465104B - Data transmission method based on unlicensed frequency band of electric power Internet of things - Google Patents
Data transmission method based on unlicensed frequency band of electric power Internet of things Download PDFInfo
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- CN111465104B CN111465104B CN202010136176.5A CN202010136176A CN111465104B CN 111465104 B CN111465104 B CN 111465104B CN 202010136176 A CN202010136176 A CN 202010136176A CN 111465104 B CN111465104 B CN 111465104B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention relates to the field of electric power Internet of things, in particular to a data transmission method based on an unlicensed frequency band of the electric power Internet of things, which comprises the following steps: aiming at a plurality of sensors in the electric power internet of things system, dividing the sensors with the same uplink period into 1 group or multiple groups; performing resource allocation according to the sequence from short to long of the uplink period; constructing a first frame structure and a second frame structure according to the requirement characteristics of the uplink transmission data quantity of the sensor; dynamically adjusting the proportion configuration of the first frame structure and the second frame structure by analyzing the characteristics of the uplink data transmission of the sensor in real time so as to meet the requirement of the uplink data transmission; and periodically ascending the data packet acquired by the sensor in a semi-static scheduling mode. The invention reduces the cost of control signaling, improves the capacity of uplink data transmission, and simultaneously dynamically switches the configuration of the frame structure by analyzing the characteristics of uplink and downlink data transmission, thereby maximizing the utilization efficiency of resources.
Description
Technical Field
The invention relates to the field of electric power Internet of things, in particular to a data transmission method based on an unlicensed frequency band of the electric power Internet of things.
Background
The ubiquitous electric power Internet of things is an intelligent service system which fully applies modern information technologies such as mobile interconnection and artificial intelligence and advanced communication technologies, realizes all-thing interconnection and man-machine interaction of all links of an electric power system, and has the characteristics of comprehensive state perception, high-efficiency information processing, convenience and flexibility in application and the like.
Today, where wireless spectrum resources are scarce, the contradiction between supply and demand of spectrum resources is prominent, general enterprises cannot obtain the authorization of the authorized frequency band, the unlicensed frequency band resources are rich, and the unlicensed frequency band resources can be legally used for free as long as the supervision policy is met, so that the performance of the network is greatly improved. Therefore, the 5.8G unlicensed frequency band is used in the electric power Internet of things system, and the network bandwidth can be greatly improved under the condition of not increasing the frequency band licensed cost.
In the current power internet of things system, the uplink data of the sensor has the characteristics of large quantity, periodicity and small data packet, if the uplink data transmission is performed by using the traditional data transmission mode based on scheduling authorization, the overhead of control signaling can be large, and a large quantity of communication resources can be used for scheduling a small quantity of uplink data, so that the utilization efficiency of spectrum resources is reduced.
In addition, in the current power internet of things system, a 5.8G base station deployment structure adopts a traditional TD-LTE (Time Division Long-term Evolution) frame structure, 7 frame structures of the traditional TD-LTE system are mainly designed for human-to-human communication, the human-to-human communication has the characteristic of large downlink demand, downlink transmission of data such as video pictures and the like can occupy a large amount of communication resources, and the number of downlink subframes in the frame structure is larger than that of uplink subframes. However, in the power system, the main service is data uploading of devices such as a sensor, and the data transmission capacity of the device is far greater than the data transmission capacity of the device of the downlink, so that the traditional frame structure configuration is not suitable for the unlicensed band power internet of things system.
Disclosure of Invention
In order to solve the problems, the invention provides a data transmission method based on an unlicensed frequency band of an electric power Internet of things.
A data transmission method based on an unlicensed frequency band of an electric power Internet of things comprises the following steps:
aiming at a plurality of sensors in the electric power internet of things system, dividing the sensors with the same uplink period into 1 group or multiple groups;
performing resource allocation according to the sequence from short to long of the uplink period;
constructing a first frame structure and a second frame structure according to the requirement characteristics of the uplink transmission data quantity of the sensor;
dynamically adjusting the proportion configuration of the first frame structure and the second frame structure by analyzing the characteristics of the uplink data transmission of the sensor in real time so as to meet the requirement of the uplink data transmission;
and periodically ascending the data packet acquired by the sensor in a semi-static scheduling mode.
Preferably, for the plurality of sensors in the power internet of things system, dividing the sensors with the same uplink period into 1 group or multiple groups includes:
when the number of the sensors with the same uplink period is larger than a set threshold value, dividing the sensors into a plurality of groups, wherein the number of each group of sensors is smaller than or equal to the set threshold value;
when the number of the sensors with the same uplink period is less than or equal to a set threshold value, the sensors are divided into 1 group.
Preferably, the resource allocation in the order from short to long in the uplink period includes:
and setting subscripts for all the sensors in each group respectively, distributing a series of continuous resource blocks for each group of sensors, and then selecting a specific resource block by the sensors in the group according to the subscripts.
Preferably, the first frame structure includes: i downlink subframes, j special subframes and k uplink subframes, wherein i+j+k=10, i, j and k are natural numbers;
the second frame structure is all uplink subframes.
Preferably, the special subframe includes: dwPTS, GP, upPTS.
Preferably, the constructing the first frame structure according to the requirement characteristics of the uplink transmission data amount of the sensor includes:
according to the demand characteristics of the uplink transmission data quantity of the sensor, the proportion of the downlink subframes, the special subframes and the uplink subframes in the first frame structure is realized by setting the values of i, j and k so as to meet the requirement of uplink and downlink data transmission.
Preferably, the dynamically adjusting the ratio configuration of the first frame structure and the second frame structure by analyzing the characteristics of the uplink data transmission of the sensor in real time includes:
when the speed requirement of uplink data transmission is smaller than a set threshold value, only using the first frame structure to realize the uplink data transmission;
when the speed requirement of the uplink data transmission is greater than or equal to the set threshold, the proportion configuration of the first frame structure and the second frame structure is dynamically adjusted according to the speed requirement of the uplink data transmission.
Preferably, the method further comprises:
when the uplink of the data packet goes wrong, the HARQ retransmission adopts a dynamic scheduling mode to schedule each sensor independently.
By using the invention, the following effects can be achieved:
1. the method has the advantages that the uplink data of the sensors has the characteristics of a large number of periodic small data packets, the periodically reported sensor data are grouped and then semi-static scheduling is carried out, so that resources are only required to be uniformly allocated for each group of sensors, and the cost of control signaling is reduced;
2. according to the requirement characteristic of large uplink transmission data volume of the power system, two novel frame structures are provided, compared with the traditional TD-LTE frame structure, the uplink frame occupation ratio is greatly improved, the uplink data transmission capacity is improved, meanwhile, the configuration of the frame structure is dynamically switched by analyzing the characteristic of uplink and downlink data transmission,
the utilization efficiency of resources can be maximized.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic flowchart of steps S1 to S5 in a data transmission method based on an unlicensed band of an electric power internet of things according to an embodiment of the present invention;
fig. 2 is a block diagram of a combination mode of a first frame structure and a second frame structure in a data transmission method based on an unlicensed band of an electric power internet of things according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of step S6 in a data transmission method based on unlicensed band of the power internet of things according to an embodiment of the present invention.
Detailed Description
The technical scheme of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these examples.
The basic idea of the invention is to utilize the characteristics that the uplink data of the sensor has a large number of periodic small data packets, and to group the periodically reported sensor data and then to perform semi-static scheduling, so that only resources are required to be uniformly allocated for each group of sensors, and the cost of control signaling is reduced. According to the characteristics of large uplink transmission data volume of a sensor in an electric power system, two novel frame structures are provided, compared with the traditional TD-LTE frame structure, the uplink frame occupation ratio is greatly improved, the uplink data transmission capacity is improved, meanwhile, the configuration of the frame structure is dynamically switched by analyzing the characteristics of uplink and downlink data transmission, and the utilization efficiency of resources can be maximized.
Based on the above ideas, the invention provides a data transmission method based on an unlicensed frequency band of an electric power internet of things, as shown in fig. 1, comprising the following steps:
s1: aiming at a plurality of sensors in the electric power internet of things system, dividing the sensors with the same uplink period into 1 group or multiple groups;
s2, carrying out resource allocation according to the sequence from short to long of the uplink period;
s3, constructing a first frame structure and a second frame structure according to the requirement characteristics of the uplink transmission data quantity of the sensor;
s4, dynamically adjusting the proportion configuration of the first frame structure and the second frame structure by analyzing the characteristics of the uplink data transmission of the sensor in real time so as to meet the requirement of the uplink data transmission;
and S5, periodically ascending the data packet acquired by the sensor in a semi-static scheduling mode.
In this embodiment, for a plurality of sensors in the power internet of things system, the method for dividing the sensors with the same uplink period into 1 group or multiple groups is as follows: when the number of the sensors with the same uplink period is larger than a set threshold value, dividing the sensors into a plurality of groups, wherein the number of each group of sensors is smaller than or equal to the set threshold value; when the number of the sensors with the same uplink period is less than or equal to a set threshold value, the sensors are divided into 1 group.
Because the uplink data of the sensor has the characteristics of a large number of periodic small data packets in the electric power internet of things system, in order to reduce the overhead of control signaling, semi-static scheduling is performed after periodically reported sensor data is grouped. The number of the sensors in the network is M, K different periods T are shared, the sensors with the same period are divided into 1 group or a plurality of groups, and N groups are shared, and N is larger than or equal to K. When the number of sensors with the same period is too large, the sensors can be divided into a plurality of groups for the flexibility of resource allocation, otherwise, the sensors can be divided into 1 group.
In an embodiment, the resource allocation in order of the uplink period from short to long includes: and setting subscripts for all the sensors in each group respectively, distributing a series of continuous resource blocks for each group of sensors, and then selecting a specific resource block by the sensors in the group according to the subscripts.
The ith group is provided with Ni sensors, subscripts 1-Ni are allocated to the sensors in each group in the grouping process, then resource allocation is uniformly carried out on all the sensors in each group, at the moment, only a series of continuous resource blocks are allocated to each group of sensors, and then the sensors in the group select specific resource blocks according to the subscripts. Specifically, if a certain group is allocated to the resource of (slot m, RB n), the resource block selected by the j-th sensor in the group is (slot m, RB n+j-1). Compared with the traditional method that M sensors need to be independently scheduled without grouping, the size of grouping control signaling is reduced to the original N/M, so that the control signaling overhead is greatly reduced. When the resources are allocated to the N groups of sensors, the resources of the short-period sensors are allocated according to the sequence from short to long, namely, the resources of the short-period sensors are allocated first, and the resources of the long-period sensors are filled in the residual resource space. This is because the shorter the period, the more sensitive the sensor to the delay, the more resources should be allocated to it preferentially, guaranteeing the reliability of its transmission.
The first frame structure includes: i downlink subframes, j special subframes and k uplink subframes, wherein i+j+k=10, i, j and k are natural numbers. Wherein the special subframe comprises: dwPTS (downlink pilot time slot), GP (guard interval), upPTS (uplink pilot time slot). The DwPTS transmits a downlink reference signal, and may also transmit some control information. Some short RACH and SRS information may be transmitted on UpPTS. GP is the guard time between upstream and downstream. In contrast, the UpPTS has a fixed length, and only supports one symbol and two symbols, so as to avoid excessive options, simplify the system design, and the GP and DwPTS have great flexibility, which is mainly used for realizing variable GP length and GP position to support cell radii of various sizes.
The second frame structure is all uplink subframes, namely, 100% of resources are allocated to uplink transmission, but because no downlink subframes and special subframes exist, transmission of control signaling and measurement of CSI cannot be performed, and thus, the uplink transmission cannot be used alone.
In this embodiment, the method for constructing the first frame structure according to the requirement characteristics of the uplink transmission data volume of the power system includes: according to the demand characteristics of the uplink transmission data volume of the power system, the ratio of the downlink sub-frame, the special sub-frame and the uplink sub-frame in the first frame structure is realized by setting the values of i, j and k so as to meet the requirement of uplink and downlink data transmission.
That is, when the uplink data amount of the power system in the current time period is generally required, only the number i of uplink subframes in the first frame structure is set to be a general size, for example, 5 or 6; when the requirement of the uplink transmission data amount of the power system in the current time period is large, only the number i of the uplink subframes in the first frame structure is required to be set to be large, for example, 8. In general, the uplink data transmission method comprises 1 downlink subframe, 1 special subframe and 8 uplink subframes, and the proportion of the uplink subframes reaches 80%, so that the uplink data transmission capability is greatly improved.
In this embodiment, the method for dynamically adjusting the proportion configuration of the first frame structure and the second frame structure by analyzing the characteristics of uplink data transmission in real time includes: when the speed requirement of uplink data transmission is smaller than a set threshold value, only using the first frame structure to realize the uplink data transmission; when the speed requirement of the uplink data transmission is greater than or equal to the set threshold, the proportion configuration of the first frame structure and the second frame structure is dynamically adjusted according to the speed requirement of the uplink data transmission.
For the frame structure switching example shown in fig. 2, the electric power internet of things first uses the first frame structure, at a certain moment, the uplink transmission requirement of the network increases, and the proportion of uplink subframes of the first frame structure is 80% insufficient to support uplink transmission, so that the electric power internet of things switches to a combined mode of the first frame structure and the second frame structure, and the combined frame is composed of 1 first frame structure and 1 second frame structure, and the proportion of uplink subframes is 90%, so that the uplink transmission capability is improved, and the uplink service transmission requirement is met.
In the semi-static scheduling mode, in the scheduling transmission process of LTE, the eNB indicates the current scheduling information of the UE through the PDCCH in the initial scheduling, and if the UE identifies that the UE is semi-static scheduling, the current scheduling information is saved, and the service data is transmitted or received at the same time-frequency resource position at fixed intervals. It is easy to understand that by using semi-static scheduling transmission, the characteristic that voice data packets arrive periodically can be fully utilized, and the voice data packets are authorized for one time and used periodically, so that PDCCH resources of an LTE system for scheduling indication can be effectively saved, and certain control information can be reserved for dynamically scheduled services for use while the system performance is not affected.
In an embodiment, as shown in fig. 3, a data transmission method based on the unlicensed band of the electric power internet of things further includes the following steps:
s6: when the uplink of the data packet goes wrong, the HARQ retransmission adopts a dynamic scheduling mode to schedule each sensor independently.
And the periodic transmission characteristic of the sensor is utilized, a semi-static scheduling mode is used, and after one scheduling is completed, the sensor in the network periodically transmits data in an uplink mode on the allocated resource block without scheduling until the next scheduling. Considering that decoding errors may occur in uplink data, HARQ (Hybrid Automatic Repeat request) retransmission is needed, and a dynamic scheduling mode is used for a retransmitted data packet, namely, resources are allocated to each retransmission independently, the grouping mode is not used for scheduling each sensor independently, and the resources occupied by HARQ retransmission are less because the position of the sensor in a power system is fixed, the channel state is stable and the average retransmission times is lower.
In an example embodiment, the number of sensors in the electric internet of things is m=48, and k=4 different periods are total, respectively t=2, 4, 10, 20, and each period includes 3, 10, 8, 27 sensors. The sensors of t=2 are divided into 1 group, the sensors of t=4 are divided into 1 group, the sensors of t=10 are divided into 1 group, the sensors of t=20 are divided into 4 groups, and the total is n=7 groups.
RB resources are allocated to the sensors t=2 and 4, and the RB resources of the sensors t=10 and 20 are filled in the rest resource blocks, so that the resources of the short-period sensors are guaranteed to be allocated preferentially. The number of sensors with t=20 is divided into 4 groups, so that flexibility of resource allocation is ensured. The size of the packet control signaling is reduced to the original N/m=7/48 compared to the traditional no packet requiring separate scheduling for m=48 sensors. When the data packet transmission is in error, the HARQ retransmission adopts a dynamic resource allocation mode, and does not allocate resources according to the grouping, and each sensor is independently scheduled. After one-time scheduling, the semi-static scheduling mode is adopted, and the scheduling scheme is repeated with 20 cycles, so that the sensor network normally uplink data is enabled under the condition of no scheduling, and the scheduling overhead is further reduced.
Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (8)
1. The data transmission method based on the unlicensed frequency band of the electric power Internet of things is characterized by comprising the following steps of:
aiming at a plurality of sensors in the electric power internet of things system, dividing the sensors with the same uplink period into 1 group or multiple groups;
performing resource allocation according to the sequence from short to long of the uplink period;
constructing a first frame structure and a second frame structure according to the requirement characteristics of the uplink transmission data quantity of the sensor;
dynamically adjusting the proportion configuration of the first frame structure and the second frame structure by analyzing the characteristics of the uplink data transmission of the sensor in real time so as to meet the requirement of the uplink data transmission;
and periodically ascending the data packet acquired by the sensor in a semi-static scheduling mode.
2. The method for transmitting data based on the unlicensed frequency band of the electric power internet of things according to claim 1, wherein the dividing the sensors with the same uplink period into 1 or more groups for the plurality of sensors in the electric power internet of things system comprises:
when the number of the sensors with the same uplink period is larger than a set threshold value, dividing the sensors into a plurality of groups, wherein the number of each group of sensors is smaller than or equal to the set threshold value;
when the number of the sensors with the same uplink period is less than or equal to a set threshold value, the sensors are divided into 1 group.
3. The method for transmitting data based on unlicensed band of electric power internet of things according to claim 1, wherein the allocating resources according to the order of the uplink period from short to long comprises:
and setting subscripts for all the sensors in each group respectively, distributing a series of continuous resource blocks for each group of sensors, and then selecting a specific resource block by the sensors in the group according to the subscripts.
4. The method for transmitting data based on the unlicensed band of the electric power internet of things according to claim 1, wherein,
the first frame structure includes: i downlink subframes, j special subframes and k uplink subframes, wherein i+j+k=10, i, j and k are natural numbers;
the second frame structure is all uplink subframes.
5. The method for data transmission based on unlicensed band of electric power internet of things according to claim 4, wherein,
the special subframe includes: dwPTS, GP, upPTS.
6. The method for data transmission based on unlicensed band of electric power internet of things according to claim 4, wherein the constructing the first frame structure according to the requirement characteristics of the uplink transmission data volume of the sensor comprises:
according to the demand characteristics of the uplink transmission data quantity of the sensor, the proportion of the downlink subframes, the special subframes and the uplink subframes in the first frame structure is realized by setting the values of i, j and k so as to meet the requirement of uplink and downlink data transmission.
7. The method for transmitting data based on unlicensed band of electric power internet of things according to claim 4, wherein dynamically adjusting the ratio configuration of the first frame structure and the second frame structure by analyzing the characteristics of uplink data transmission of the sensor in real time comprises:
when the speed requirement of uplink data transmission is smaller than a set threshold value, only using the first frame structure to realize the uplink data transmission;
when the speed requirement of the uplink data transmission is greater than or equal to the set threshold, the proportion configuration of the first frame structure and the second frame structure is dynamically adjusted according to the speed requirement of the uplink data transmission.
8. The method for transmitting data based on the unlicensed band of the electric power internet of things according to claim 1, further comprising:
when the uplink of the data packet goes wrong, the HARQ retransmission adopts a dynamic scheduling mode to schedule each sensor independently.
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