CN110809285B - Data transmission method and data transmission system based on channel conditions - Google Patents
Data transmission method and data transmission system based on channel conditions Download PDFInfo
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- CN110809285B CN110809285B CN201810883404.8A CN201810883404A CN110809285B CN 110809285 B CN110809285 B CN 110809285B CN 201810883404 A CN201810883404 A CN 201810883404A CN 110809285 B CN110809285 B CN 110809285B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012790 confirmation Methods 0.000 claims description 16
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- 238000005259 measurement Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
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Abstract
The invention discloses a data transmission method and a data transmission system based on channel conditions, wherein the data transmission method comprises the following steps: the base station transmits data with the terminal equipment on a current serving cell according to a preset radio frame, and transmits the data in the radio frame by using a basic transmission unit, wherein the radio frame comprises a plurality of subframes, each subframe comprises a plurality of symbols, and the basic transmission unit comprises a plurality of symbols, and the number of the symbols is the same as that of the symbols of the subframe; the base station measures the channel quality of a wireless frame sent by the terminal equipment in real time and determines the signal grade according to the channel quality; the base station changes the number of symbols included in the basic transmission unit according to the signal level and transmits data in the changed basic transmission unit in a wireless frame; the higher the signal level is, the more the number of symbols included in the basic transmission unit is; the lower the signal level, the fewer the number of symbols the basic transmission unit comprises. The invention can give consideration to both long-distance users and short-distance users.
Description
Technical Field
The invention relates to the technical field of communication of the Internet of things, in particular to a data transmission method and a data transmission system based on channel conditions.
Background
The existing Internet of Things communication system is difficult to consider the signal coverage and air interface efficiency of a long-distance user and a short-distance user at the same time, for example, the repetition logic of an NB-IoT (Narrow Band Internet of Things) protocol control channel needs to be fixed when the system is deployed, which results in that the long-distance user and the short-distance user cannot consider simultaneously.
Disclosure of Invention
The invention aims to: in view of the above problems, a data transmission method and a data transmission system based on channel conditions are provided, which can give consideration to both a long-distance user and a short-distance user.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a data transmission method based on channel conditions, the data transmission method including: the base station transmits data with the terminal equipment on a current serving cell according to a preset radio frame, and transmits the data in the radio frame by using a basic transmission unit, wherein the radio frame comprises a plurality of subframes, each subframe comprises a plurality of symbols, and the basic transmission unit comprises a plurality of symbols and has the same number as the symbols of the subframe; the base station measures the channel quality of a wireless frame sent by the terminal equipment in real time and determines the signal grade according to the channel quality; the base station changes the number of symbols included in the basic transmission unit according to the signal level and transmits data in the changed basic transmission unit in the wireless frame; wherein the higher the signal level, the greater the number of symbols included by the basic transmission unit; the lower the signal level, the fewer the number of symbols comprised by the basic transmission unit.
Preferably, the step of measuring, by the base station, the channel quality of the radio frame sent by the terminal device in real time, and determining the signal strength level according to the channel quality specifically includes: the base station measures the channel quality of a wireless frame sent by the terminal equipment in real time; and the base station inquires the signal grade corresponding to the channel quality in a local configuration table, and the local configuration table records the signal grades corresponding to different channel qualities.
Preferably, the signal level is divided into 7 levels, and the basic transmission unit includes a relation between the number of symbols and the signal level as follows:
N＝2 n+2
wherein, N is the number of symbols included in the basic transmission unit, N is the signal level, and N is a positive integer.
Preferably, the base station measures the channel quality of the wireless frame sent by the terminal device in real time according to the distance between the terminal device and the base station.
Preferably, the base station measures the channel quality of the wireless frame sent by the terminal device in real time according to the signal-to-noise ratio of the wireless frame.
In order to solve the technical problem, the invention adopts another technical scheme that: providing a data transmission system based on channel conditions, the data transmission system comprising a base station and at least one terminal device communicating with the base station, the base station comprising a data transmission module and a channel quality confirmation module; the data transmission module is used for performing data transmission with the terminal equipment on a current serving cell according to a preset radio frame and transmitting data in the radio frame by using a basic transmission unit, wherein the radio frame comprises a plurality of subframes, each subframe comprises a plurality of symbols, and the basic transmission unit comprises a plurality of symbols and has the same number as the symbols of the subframe; the channel quality confirmation module is used for measuring the channel quality of a wireless frame sent by the terminal equipment in real time and determining the signal grade according to the channel quality; the data transmission module is further configured to change the number of symbols included in the basic transmission unit according to the signal level, and transmit data in the radio frame by using the changed basic transmission unit; wherein the higher the signal level, the greater the number of symbols included by the basic transmission unit; the lower the signal level, the fewer the number of symbols comprised by the basic transmission unit.
Preferably, the channel quality confirmation module is specifically configured to query a local configuration table for a signal level corresponding to the channel quality, where the local configuration table records signal levels corresponding to different channel qualities.
Preferably, the signal level is divided into 7 levels, and the basic transmission unit includes a relation between the number of symbols and the signal level as follows:
N＝2 n+2
wherein, N is the number of symbols included in the basic transmission unit, N is the signal level, and N is a positive integer.
Preferably, the channel quality confirmation module is specifically configured to measure, in real time, channel quality of a radio frame sent by the terminal device according to a distance between the terminal device and the base station.
Preferably, the channel quality confirmation module is specifically configured to measure, in real time, the channel quality of the radio frame sent by the terminal device according to the signal-to-noise ratio of the radio frame.
In summary, due to the adoption of the technical scheme, the data is transmitted by the basic transmission unit on the basis of wireless frame transmission, the basic transmission unit comprises a plurality of symbols of the wireless frame, when the channel quality of the wireless frame changes, the signal level is determined according to the channel quality, the number of the symbols included in the basic transmission unit is changed according to the signal level, the data is transmitted by the changed basic transmission unit in the wireless frame, and the higher the signal level is, the more the number of the symbols included in the basic transmission unit is; the lower the signal level, the fewer the number of symbols the basic transmission unit comprises, thus allowing for both long and short range users.
Drawings
Fig. 1 is a schematic structural diagram of a radio frame with a signal level of 4 in the embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a radio frame with a signal level of 5 in the embodiment of the present invention.
Fig. 3 is a schematic signaling interaction diagram of a data transmission system in the internet of things according to an embodiment of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
In the embodiment of the invention, the data transmission method in the Internet of things comprises the following steps:
the base station transmits data with the terminal equipment on the current service cell according to a preset radio frame, and transmits the data in the radio frame by a basic transmission unit, wherein the radio frame comprises a plurality of subframes, each subframe comprises a plurality of symbols, and the basic transmission unit comprises a plurality of symbols, and the number of the symbols is the same as that of the symbols of the subframe.
The base station measures the channel quality of a wireless frame sent by the terminal equipment in real time and determines the signal grade according to the channel quality.
And the base station changes the number of symbols included in the basic transmission unit according to the signal level and transmits data in the changed basic transmission unit in a wireless frame.
The higher the signal level is, the more the number of symbols included in the basic transmission unit is; the lower the signal level, the fewer the number of symbols the basic transmission unit comprises.
Specifically, the radio frame includes subframes of a downlink and subframes of an uplink, and in an initial state, the length of a basic transmission unit corresponds to the length of one subframe, and the base station and the terminal device transmit and receive a control channel and a data channel on the basic transmission unit. The base station can obtain the channel quality of the wireless frame through the measurement of the uplink channel.
In this embodiment, the step of the base station measuring the channel quality of the radio frame sent by the terminal device in real time and determining the signal strength level according to the channel quality specifically includes: the base station measures the channel quality of a wireless frame sent by the terminal equipment in real time; the base station inquires the signal grade corresponding to the channel quality in a local configuration table, and the local configuration table records the signal grades corresponding to different channel qualities.
In some application scenarios, the signal level is divided into 7 levels, and the number of symbols included in the basic transmission unit and the signal level are related as follows:
N＝2 n+2
wherein, N is the number of symbols included in the basic transmission unit, N is the signal level, and N is a positive integer.
An embodiment of the data transmission method of the present invention will be described below with reference to fig. 1 and 2.
Referring to fig. 1 and 2, in the drawings, a frame represents a radio frame, a subframe represents a subframe, DL represents that the subframe is a downlink subframe, UL represents that the subframe is an uplink subframe, slot represents a slot, symbol represents a symbol, and burst represents a basic transmission unit. The radio frame includes 16 subframes, each subframe including 64 symbols.
In a specific application, the correspondence between the signal level and the number of symbols is shown in the following table:
| BOOST level | number of |
| 1 | 8 |
| 2 | 16 |
| 3 | 32 |
| 4 | 64 |
| 5 | 128 |
| 6 | 512 |
| 7 | 1024 |
In the table, BOOST level indicates a signal level.
When the base station and the terminal device initially communicate, the signal level defaults to the 4 th level, and then the number of symbols included in the basic transmission unit is 64, which is equivalent to the length of one subframe. Fig. 1 is a schematic structural diagram of a radio frame with a signal level of 4 in the embodiment of the present invention.
After the base station obtains the channel quality through real-time measurement, the base station confirms that the signal level is 5, and then the base station changes the number of symbols included in the basic transmission unit to be 128 according to the signal level and transmits data in a wireless frame by using the changed basic transmission unit. Fig. 2 is a schematic structural diagram of a radio frame with a signal level of 5 in the embodiment of the present invention. It should be noted that, since the basic transmission unit spans two uplink subframes or two downlink subframes, another subframe between the two uplink subframes or the two downlink subframes is skipped, which is equivalent to the basic transmission unit transmitting data only at the two uplink subframes or only at the two downlink subframes.
In this embodiment, the base station may measure the channel quality of the radio frame transmitted by the terminal device in real time according to the distance between the terminal device and the base station. In other embodiments, the base station measures the channel quality of the wireless frame transmitted by the terminal device in real time according to the signal-to-noise ratio of the wireless frame. For example, the base station sends a pilot signal to the terminal device, the terminal device receives the pilot signal and calculates the distance between the terminal device and the base station, and then the terminal device sends the distance value to the base station.
Through the mode, the data transmission method based on the channel condition measures the channel quality in real time to obtain the signal grade, and changes the number of the symbols included by the basic transmission unit according to the signal grade, wherein the higher the signal grade is, the more the number of the symbols included by the basic transmission unit is, the larger the signal coverage is, but the smaller the system capacity is; the lower the signal level is, the fewer the number of symbols included in the basic transmission unit is, the smaller the signal coverage is, but the larger the system capacity is, different signal levels are selected for users at different distances, so that the long-distance user and the short-distance user can be considered, and the strong adaptability is realized.
Fig. 3 is a schematic signaling interaction diagram of a data transmission system in the internet of things according to an embodiment of the present invention. In the embodiment of the present invention, the data transmission system includes a base station 10 and at least one terminal device 20 communicating with the base station 10, and the base station 10 includes a data transmission module 11 and a channel quality confirmation module 12.
The data transmission module 11 is configured to perform data transmission with the terminal device 20 on the current serving cell according to a preset radio frame, and transmit data in the radio frame by using a basic transmission unit, where the radio frame includes a plurality of subframes, each subframe includes a plurality of symbols, and the basic transmission unit includes a plurality of symbols, and the number of the symbols is the same as that of the subframe.
The channel quality confirmation module 12 is configured to measure the channel quality of the wireless frame sent by the terminal device 20 in real time, and determine the signal level according to the channel quality.
The data transmission module 11 is further configured to change the number of symbols included in the basic transmission unit according to the signal level, and transmit data in the changed basic transmission unit in the radio frame.
Wherein, the higher the signal level is, the more the number of symbols included in the basic transmission unit is; the lower the signal level, the fewer the number of symbols comprised by the basic transmission unit.
Specifically, the radio frame includes subframes including downlink subframes and uplink subframes. For example, a radio frame includes 16 subframes, each subframe including 64 symbols. In an initial state, the length of the basic transmission unit corresponds to the length of one subframe, and the data transmission module 11 and the terminal device 20 transmit and receive the control channel and the data channel on the basic transmission unit. The channel quality confirmation module 12 may obtain the channel quality of the radio frame through measurement of the uplink channel.
In this embodiment, the channel quality confirmation module 12 is specifically configured to query a local configuration table for a signal level corresponding to the channel quality, where the local configuration table records signal levels corresponding to different channel qualities.
In some application scenarios, the signal level is divided into 7 levels, and the number of symbols included in the basic transmission unit and the signal level are related as follows:
N＝2 n+2
wherein, N is the number of symbols included in the basic transmission unit, N is the signal level, and N is a positive integer.
In this embodiment, the channel quality confirmation module 12 is specifically configured to measure the channel quality of the wireless frame transmitted by the terminal device 20 in real time according to the distance between the terminal device 20 and the base station 10. In other embodiments, channel quality confirmation module 12 is specifically configured to measure, in real time, the channel quality of the radio frame transmitted by terminal device 20 according to the signal-to-noise ratio of the radio frame. For example, the base station 10 transmits a pilot signal to the terminal device 20, the terminal device 20 receives the pilot signal and calculates the distance between it and the base station 10, and then the terminal device 20 transmits its distance value to the base station 10.
Through the mode, the data transmission system based on the channel condition obtains the signal grade after measuring the channel quality in real time, and changes the number of the symbols included by the basic transmission unit according to the signal grade, wherein the higher the signal grade is, the more the number of the symbols included by the basic transmission unit is, the larger the signal coverage is, but the smaller the system capacity is; the lower the signal level, the less the number of symbols included in the basic transmission unit, the smaller the signal coverage, but the larger the system capacity, so as to be able to give consideration to both the long-distance user and the short-distance user, and have strong adaptability.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. A method for data transmission based on channel conditions,
the data transmission method comprises the following steps:
the method comprises the steps that a base station transmits data with terminal equipment on a current serving cell according to a preset radio frame, and transmits the data in the radio frame by using a basic transmission unit, wherein the radio frame comprises a plurality of subframes, each subframe comprises a plurality of symbols, and the basic transmission unit comprises a plurality of symbols and has the same number as the symbols of the subframe;
the step of the base station measuring the channel quality of the wireless frame sent by the terminal equipment in real time and determining the signal grade according to the channel quality specifically comprises the following steps:
the base station measures the channel quality of a wireless frame sent by the terminal equipment in real time;
the base station inquires the signal grade corresponding to the channel quality in a local configuration table, and the local configuration table records the signal grades corresponding to different channel qualities;
the base station changes the number of symbols included in the basic transmission unit according to the signal level and transmits data in the wireless frame by the changed basic transmission unit;
wherein the higher the signal level, the greater the number of symbols included by the basic transmission unit; the lower the signal level, the fewer the number of symbols comprised by the basic transmission unit.
2. The data transmission method according to claim 1,
the signal levels are divided into 7 levels, and the relation between the number of symbols included in the basic transmission unit and the signal levels is as follows:
N＝2n+2
wherein N is the number of symbols included in the basic transmission unit, N is a signal level, and N is a positive integer.
3. The data transmission method according to any one of claims 1 to 2,
and the base station measures the channel quality of a wireless frame sent by the terminal equipment in real time according to the distance between the terminal equipment and the base station.
4. The data transmission method according to any one of claims 1 to 2,
and the base station measures the channel quality of the wireless frame sent by the terminal equipment in real time according to the signal-to-noise ratio of the wireless frame.
5. A data transmission system based on channel conditions,
the data transmission system comprises a base station and at least one terminal device which communicates with the base station, wherein the base station comprises a data transmission module and a channel quality confirmation module;
the data transmission module is used for performing data transmission with the terminal equipment on a current serving cell according to a preset radio frame and transmitting data in the radio frame by using a basic transmission unit, wherein the radio frame comprises a plurality of subframes, each subframe comprises a plurality of symbols, and the basic transmission unit comprises a plurality of symbols and has the same number as the symbols of the subframe;
the step of the channel quality confirmation module being configured to measure the channel quality of the radio frame sent by the terminal device in real time, and determining the signal level according to the channel quality specifically includes:
the base station measures the channel quality of a wireless frame sent by the terminal equipment in real time;
the base station inquires the signal grade corresponding to the channel quality in a local configuration table, and the local configuration table records the signal grades corresponding to different channel qualities;
the data transmission module is further configured to change the number of symbols included in the basic transmission unit according to the signal level, and transmit data in the radio frame in the changed basic transmission unit;
wherein the higher the signal level, the greater the number of symbols included by the basic transmission unit; the lower the signal level, the fewer the number of symbols comprised by the basic transmission unit.
6. The data transmission system of claim 5,
the channel quality confirmation module is specifically configured to query, in a local configuration table, a signal level corresponding to the channel quality, where the local configuration table records signal levels corresponding to different channel qualities.
7. The data transmission system of claim 5,
the signal levels are divided into 7 levels, and the relation between the number of symbols included in the basic transmission unit and the signal levels is as follows:
N＝2n+2
wherein, N is the number of symbols included in the basic transmission unit, N is the signal level, and N is a positive integer.
8. The data transmission system according to any one of claims 5 to 7,
the channel quality confirmation module is specifically configured to measure, in real time, the channel quality of a wireless frame sent by a terminal device according to a distance between the terminal device and a base station.
9. The data transmission system according to any one of claims 5 to 7,
the channel quality confirmation module is specifically configured to measure, in real time, the channel quality of the wireless frame sent by the terminal device according to the signal-to-noise ratio of the wireless frame.
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