CN107708199B - Method for improving downlink reliability of low-power-consumption wireless cellular network - Google Patents
Method for improving downlink reliability of low-power-consumption wireless cellular network Download PDFInfo
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- CN107708199B CN107708199B CN201710880878.2A CN201710880878A CN107708199B CN 107708199 B CN107708199 B CN 107708199B CN 201710880878 A CN201710880878 A CN 201710880878A CN 107708199 B CN107708199 B CN 107708199B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
- H04W56/007—Open loop measurement
- H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
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- 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 invention discloses a method for improving the downlink reliability of a low-power-consumption wireless cellular network, which comprises the steps of initially setting the length of a receiving window of a terminal as a standard value, continuously calculating the time interval of a data packet in the receiving window when the terminal receives data from a base station, dynamically calculating the real-time optimal receiving window value after the time interval reaches the set time, then adjusting the size of the receiving window per se according to the optimal receiving window value, and informing the base station of the length of the receiving window; and when no new data arrives in the preset time, the terminal automatically restores the length of the receiving window to the standard value. Through the measures, the technical aims of quickly synchronizing the downlink time windows of the base station and the terminal under various network conditions such as channel interference, network busy and communication concurrence in the actual network environment, automatically improving the downlink success rate and maximally utilizing the downlink network bandwidth are achieved.
Description
Technical Field
The invention relates to the technical field of wireless cellular communication, in particular to a method for improving downlink reliability of a low-power-consumption wireless cellular network.
Background
In the technical field of low-power wireless cellular network communication at present, a half-duplex mode is generally adopted, and data sending and receiving are initiated at fixed time, but due to channel interference, network busy, communication concurrence and the like in an actual network environment, a downlink time window between a base station and a terminal is not easy to synchronize, and thus the downlink communication failure rate is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for improving the downlink reliability of a low-power-consumption wireless cellular network, the length of a receiving window of a terminal is initially set as a standard value, the time interval of a data packet in the receiving window is continuously calculated when the terminal receives data from a base station, after the time reaches the set time in an accumulation manner, the real-time optimal receiving window value is dynamically calculated, then the size of the receiving window per se is adjusted according to the optimal receiving window value, and the length of the receiving window is notified to the base station; when no new data arrives in the preset time, the length of the receiving window is automatically recovered to the standard value, so that the technical aims of quickly synchronizing the downlink time windows of the base station and the terminal under various network conditions such as channel interference, network busy and communication concurrence under the actual network environment, automatically improving the downlink success rate and maximally utilizing the downlink network bandwidth are achieved.
A method for improving the downlink reliability of a low-power wireless cellular network comprises the following steps:
1) setting the length of a receiving window of a terminal as a standard value;
2) when the terminal receives data from the base station, the time interval of the data packet in the receiving window is continuously calculated;
3) and (3) repeatedly executing the step 2), and dynamically calculating the real-time optimal receiving window value after the accumulation reaches the set time:
real-time optimal receive window = terminal receive window standard/average time interval of data packets in receive window × -scaling factor;
4) the terminal adjusts the size of a receiving window of the terminal according to the value of the receiving window required by the terminal calculated in the step 3), and informs the length of the receiving window to a base station;
5) when no new data comes in the terminal within the preset time, automatically restoring the length of the receiving window to a standard value;
6) if the receiving window overflows in the process of receiving data from the base station by the terminal, immediately expanding the length of the receiving window to be 1.2 times to 1.5 times of the original value.
Further, the method for calculating the standard value of the terminal receiving window comprises the following steps:
and the terminal receiving window standard value = (channel theoretical bandwidth/8) × network round trip delay standard value × anti-overflow weight.
Further, the scaling factor for calculating the real-time optimal receiving window is between 0.05 and 0.15.
Further, the value range of the anti-overflow weight is 1.2 to 1.5.
In another embodiment of the method for improving the downlink reliability of the low-power wireless cellular network, the method for dynamically calculating the real-time optimal receiving window value includes:
1) when the terminal receives data from the base station, the actual usage amount of the receiving window is continuously calculated;
2) repeatedly executing the step 1), and calculating the actual maximum occupation ratio of the receiving window after the accumulation reaches the set time;
3) and adjusting the existing receiving window according to the calculated actual maximum occupation ratio of the receiving window.
Further, if the maximum occupancy ratio is less than 30%, reducing the existing receiving window to 1.5 times of the actual maximum usage amount of the receiving window; if the maximum occupancy ratio is greater than 90%, the existing receive window is expanded to between 1.2 and 1.5 times the original value.
The invention has the following beneficial effects: the invention sets the length of the receiving window of the terminal as a standard value initially, continuously calculates the time interval of the data packet in the receiving window when the terminal receives the data from the base station, dynamically calculates the real-time optimal receiving window value after the accumulation reaches the set time, then adjusts the size of the receiving window according to the optimal receiving window value, and informs the base station of the length of the receiving window; and when no new data arrives in the preset time, the terminal automatically restores the length of the receiving window to the standard value. Through the measures, the technical aims of quickly synchronizing the downlink time windows of the base station and the terminal under various network conditions such as channel interference, network busy and communication concurrence in the actual network environment, automatically improving the downlink success rate and maximally utilizing the downlink network bandwidth are achieved.
Drawings
Figure 1 is a flow chart of a method for improving the downlink reliability of a low power wireless cellular network,
fig. 2 is a flow chart of another embodiment of a method for improving downlink reliability of a low power wireless cellular network.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples, which are only for the purpose of explaining the present invention and do not limit the scope of the present invention.
Example 1
A method for improving downlink reliability of a low power consumption wireless cellular network, as shown in fig. 1, includes the following steps:
s101, setting the length of a receiving window of a terminal as a standard value;
s102, when the terminal receives data from the base station, the time interval of the data packet in the receiving window is continuously calculated;
s103, repeatedly executing the step S102, and dynamically calculating the real-time optimal receiving window value after the accumulation reaches the set time:
real-time optimal receive window = terminal receive window standard/average time interval of data packets in receive window × -scaling factor;
s104, the terminal adjusts the size of a receiving window of the terminal according to the value of the receiving window required by the terminal calculated in the step S103, and informs the length of the receiving window to a base station;
s105, when no new data comes in the terminal within the preset time, automatically restoring the length of the receiving window to a standard value;
s106, if the receiving window overflows in the process that the terminal receives the data from the base station, immediately expanding the length of the receiving window to be between 1.2 times and 1.5 times of the original value.
The method for calculating the standard value of the terminal receiving window in S101 comprises the following steps:
and the terminal receiving window standard value = (channel theoretical bandwidth/8) × network round trip delay standard value × anti-overflow weight.
The theoretical bandwidth of the channel can be obtained from a network provider or can be consulted from an installed network type according to a manual, for example, the WIFI conventional bandwidth has several grades of 11MBps, 54MBps and 150MBps, the Zigbee bandwidth is generally 250kbps, the 3G network conventional bandwidth is several hundred kbps, and the 4G network theoretical bandwidth is at least 50 MBps. Different network types also correspond to different standard values of the round trip delay of the network, and the standard values are different from 1ms to 100 ms.
Wherein, the value range of the anti-overflow weight is between 1.2 and 1.5.
In the actual operation process of the terminal, the processes of calculating the packet time interval and calculating and adjusting the optimal receiving window between S102 and S104 are continuously and circularly performed to ensure that the value of the receiving window is always kept in a state matched with the actual network environment.
The average time interval of the data packets in the receiving window is calculated as follows: and in the accumulation set time, the terminal receives the average value of the time intervals of the data packets positioned in a receiving window in the data from the base station. The receiving windows generally represent TCP sliding windows, and the data time intervals between the receiving windows are useless for calculating and determining network delay due to the fact that repeated data interaction between a base station and a terminal is involved and uncertainty such as network busy, data blocking and operation efficiency is caused. The data packet time interval in a receiving window is only one-way and continuous data transmission from the base station to the terminal, the time interval reflects the actual network bandwidth and the network delay, and the average value of the data packet time interval in the receiving window, namely the average network delay in the time, is calculated and can be used for directly determining the actual value of the receiving window required by the terminal for receiving.
Wherein, the proportionality coefficient for calculating the real-time optimal receiving window is between 0.05 and 0.15.
The smaller the average value of the packet time intervals in the receiving window is, the faster the network is represented, and at this time, the larger the optimal receiving window required by the terminal is. And calculating the proportionality coefficient of the real-time optimal receiving window, and balancing the deviation and the unstable attribute caused by different round trip delay standard values of different network types in the calculation process. If the proportionality coefficient is too large, the value of the receiving window is selected to be larger, so that the receiving failure rate is higher, and the retransmission possibility tends to rise; if the proportionality coefficient is small, the receiving window may overflow, wasting the network downlink bandwidth. In the actual application process, a compromise value is selected, so that the terminal application program can automatically adapt to and automatically adjust the value of the receiving window.
Example 2
A better processing method, in the process of receiving data from a base station by a terminal, if the receiving window overflows, the length of the receiving window is immediately expanded to be between 1.2 times and 1.5 times of the original value. The overflow of the receiving window is a serious waste of the bandwidth of a downlink network, which can cause the base station to wait for a reply after sending the reply to the terminal; the overflow of the data of the receiving window shows that the real-time downlink network is smooth, the data length of the receiving window needs to be immediately and properly expanded at the moment, the length of the receiving window is immediately expanded to be between 1.2 times and 1.5 times of the original value, and the receiving window is used as an empirical value to be tested, so that the receiving window can make a proper response to the network speed in a short time and in fewer steps. The terminal informs the base station of the length of the receiving window, which is realized by the TCP protocol reply.
Example 3
As shown in fig. 2, the method for improving the downlink reliability of the low-power wireless cellular network includes the following steps:
s201, continuously calculating the actual usage amount of a receiving window when a terminal receives data from a base station;
s202, repeatedly executing the step S201, and calculating the actual maximum occupation ratio of the receiving window after the accumulation reaches the set time;
s203, adjusting the existing receiving window according to the calculated actual maximum occupation ratio of the receiving window.
In the actual operation process of the terminal, the actual maximum usage amount calculation and the optimal receiving window calculation and adjustment process of the receiving window between S201 and S203 are continuously and circularly performed to ensure that the value of the receiving window is always kept in a state matched with the actual network environment.
Further, if the maximum occupancy ratio of S203 is less than 30%, reducing the current receive window to 1.5 times of the actual maximum usage amount of the receive window; and if the maximum occupancy ratio is larger than 90%, expanding the existing receiving window to the original value of 1.2 times to 1.5 times.
The adjustment of the receiving window can ensure that the receiving window is in a reasonable and maximized utilization state, namely the maximized utilization of the downlink bandwidth, and the dynamic balance between the failure rate of the downlink communication and the utilization rate of the network bandwidth is achieved.
The method for improving the downlink reliability of the low-power-consumption wireless cellular network comprises the steps of initially setting the length of a receiving window of a terminal as a standard value, continuously calculating the time interval of a data packet in the receiving window when the terminal receives data from a base station, dynamically calculating the real-time optimal receiving window value after the time interval reaches the set time, adjusting the size of the receiving window per se according to the optimal receiving window value, and informing the base station of the length of the receiving window; and when no new data arrives in the preset time, the terminal automatically restores the length of the receiving window to the standard value. Therefore, the technical aims of quickly synchronizing the downlink time windows of the base station and the terminal under various network conditions such as channel interference, network busy and communication concurrence in the actual network environment, automatically improving the downlink success rate and maximally utilizing the downlink network bandwidth are achieved.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (4)
1. A method for improving the downlink reliability of a low-power wireless cellular network is characterized by comprising the following steps:
1) setting the length of a receiving window of a terminal as a standard value;
2) when the terminal receives data from the base station, the time interval of the data packet in the receiving window is continuously calculated;
3) and (3) repeatedly executing the step 2), and dynamically calculating the real-time optimal receiving window value after the accumulation reaches the set time:
real-time optimal receive window = terminal receive window standard/average time interval of data packets in receive window × -scaling factor;
4) the terminal adjusts the size of the self receiving window according to the real-time optimal receiving window value calculated in the step 3), and informs the base station of the length of the receiving window;
5) when no new data comes in the terminal within the preset time, automatically restoring the length of the receiving window to a standard value;
6) if the receiving window overflows in the process of receiving data from the base station by the terminal, immediately expanding the length of the receiving window to be 1.2 times to 1.5 times of the original value.
2. The method according to claim 1, wherein the method for calculating the standard value of the terminal receive window comprises:
and the terminal receiving window standard value = (channel theoretical bandwidth/8) × network round trip delay standard value × anti-overflow weight.
3. The method of claim 1, wherein the scaling factor for calculating the optimal real-time receive window is between 0.05 and 0.15.
4. The method of claim 2, wherein the overflow prevention weight has a value in a range of 1.2 to 1.5.
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| CN111356175B (en) * | 2018-12-20 | 2022-11-29 | 阿里巴巴集团控股有限公司 | Data transmission method, device, equipment and storage medium |
| CN110049478B (en) * | 2019-04-25 | 2021-11-02 | 新华三技术有限公司 | Message transmission method, device, equipment and machine readable storage medium |
| CN113034882B (en) * | 2020-12-23 | 2022-02-22 | 利尔达科技集团股份有限公司 | Centralized meter reading method based on time slice competition reporting |
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