CN109698733B - Method and device for adjusting uplink modulation and coding strategy MCS - Google Patents
Method and device for adjusting uplink modulation and coding strategy MCS Download PDFInfo
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- CN109698733B CN109698733B CN201710999424.7A CN201710999424A CN109698733B CN 109698733 B CN109698733 B CN 109698733B CN 201710999424 A CN201710999424 A CN 201710999424A CN 109698733 B CN109698733 B CN 109698733B
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
Abstract
The application provides an uplink MCS adjustment method and device, which are applied to a track traffic tunnel scene of an LTE system, and the method comprises the following steps: configuring a mapping relation table of SNR and MCS index number; when only one terminal exists in a cell, if the terminal is initially accessed, sending Msg4 to the terminal and then receiving an acknowledgement ACK sent by the terminal; or when receiving the Msg3 sent when the terminal switches and sending ACK to the terminal, performing N times of continuous uplink scheduling on the terminal; counting an uplink SNR (signal to noise ratio) for each uplink scheduling; calculating the arithmetic mean value of the N statistical SNRs; searching a corresponding MCS index number in a configured mapping relation table according to the calculated arithmetic mean value of the SNR; and adjusting the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number. The scheme can quickly adjust the MCS and reduce the service delay.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for adjusting an uplink MCS.
Background
Long Term Evolution (LTE) is a Long Term Evolution of The Universal Mobile Telecommunications System (UMTS) technology standard established by The 3rd Generation Partnership Project (3 GPP) organization.
The LTE system introduces key transmission technologies such as Orthogonal Frequency Division Multiplexing (OFDM) and multiple-Input multiple-Output (MIMO), significantly increases the spectrum efficiency and the data transmission rate (20M bandwidth 2X2MIMO is, in the case of 64QAM, a theoretical downlink maximum transmission rate of 201Mbps, and approximately 140Mbps after removing the signaling overhead, but according to the practical networking and terminal capability limitations, it is generally considered that the downlink peak rate is 100Mbps and the uplink is 50Mbps), and supports various bandwidth allocations such as 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, and 20MHz, and supports the global mainstream 2G/3G Frequency band and some newly-increased Frequency bands, so the spectrum allocation is more flexible, and the system capacity and coverage are also significantly improved.
With the continuous development and maturity of the LTE wireless network, the LTE wireless network is widely applied to customers in industries such as oil, traffic, water conservancy, public security frontier defense and the like.
In a track traffic tunnel scene, the cell coverage is realized by leaky coaxial cables, and the coverage range of a single cell is 1 kilometer. Meanwhile, the locking interval is far larger than the cell coverage. The average speed per hour of the subway is 60 km/h, and in busy hours, one time is carried out in 2 minutes, namely two vehicles are spaced by 2 km recently. Therefore, except for the case of stopping at a platform, there is mostly only one user on line at the same time in each cell.
In the conventional implementation, a Modulation and Coding Scheme (MCS) is usually adjusted by using a method based on bit error rate statistics, and the method specifically includes: and setting an upper error rate limit and a lower error rate limit. When the error rate is greater than the upper limit of the error rate, the MCS is adjusted downwards; and when the error rate is less than the lower limit of the error rate, the MCS is adjusted upwards.
In the existing scheme for adjusting the MCS, when a terminal is accessed, a large amount of uplink channel indexes need to be counted, the channel quality is calculated, then the MCS is adjusted, and the adjustment step length is short. The whole adjusting process is too long, the adjustment is not timely, and the service delay is long.
Disclosure of Invention
In view of this, the present application provides an uplink MCS adjusting method, which can quickly adjust an MCS and reduce service delay.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
an uplink MCS adjustment method is applied to a track traffic tunnel scene of an LTE system, and comprises the following steps: configuring a mapping relation table of SNR and MCS index number;
when only one terminal exists in a cell, if the terminal is initially accessed, sending Msg4 to the terminal and then receiving ACK sent by the terminal; or when receiving the Msg3 sent when the terminal switches and sending ACK to the terminal, executing the following steps:
performing N times of continuous uplink scheduling on the terminal;
counting an uplink SNR (signal to noise ratio) for each uplink scheduling;
calculating the arithmetic mean value of the N statistical SNRs;
searching a corresponding MCS index number in a configured mapping relation table according to the calculated arithmetic mean value of the SNR;
and adjusting the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
Wherein the method further comprises: the TPC field is filled with the maximum value when Msg3 grants.
Wherein, after the current uplink MCS of the terminal is adjusted to the MCS corresponding to the searched MCS index number, the method further comprises:
if the uplink MCS aiming at the terminal does not reach the maximum value and the cell only accesses the terminal, performing uplink scheduling on the terminal for M times in a power increment mode;
counting SNR of each uplink scheduling;
when the Kth SNR is counted, calculating a weighted average value of the counted K SNRs; wherein K is an integer no greater than M;
searching a corresponding MCS index number in a configured mapping table according to the calculated weighted average value of the SNR;
and adjusting the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
Wherein the method further comprises:
after the MCS of the terminal is adjusted according to the SNR weighted average value, whether the current situation is matched with a preset rule or not is determined, if so, uplink scheduling in a power increment mode is finished, and tracking fine adjustment is carried out on the uplink MCS of the terminal based on an error rate statistical algorithm; otherwise, the SNR of the K +1 th uplink scheduling is counted, the weighted average value of the 2 nd SNR to the K +1 th SNR is calculated, MCS adjustment is carried out, and the like, until any condition is met, the uplink scheduling in a power increment mode is finished, and the tracking fine adjustment based on the error rate statistical algorithm is carried out on the uplink MCS of the terminal.
Wherein, the preset rule is as follows: the uplink scheduling for M times in a power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR does not change any more; the difference value between the RSRP value and the value of-63.1 dBm is smaller than a preset threshold value;
the determining whether the current condition is matched with a preset rule includes:
when the current condition meets any one of the preset rules, determining that the current condition is matched with the preset rules; otherwise, determining that the current situation is not matched with the preset rule.
Wherein the arithmetic mean of the SNR is:
where ρ isiIs the (i + 1) th weighted average of the configuration; SNRiIs the i +1 th SNR of the K SNRs counted.
An uplink MCS adjusting device is applied to a track traffic tunnel scene of an LTE system, and comprises: the device comprises a configuration unit, a processing unit, a statistical unit, a calculation unit, a search unit and an adjustment unit;
the configuration unit is used for configuring a mapping relation table of SNR and MCS index number;
the processing unit is configured to send Msg4 to the terminal and then receive an ACK sent by the terminal if the terminal is initially accessed when there is only one terminal for a cell; or when receiving the Msg3 sent when the terminal switches and sending ACK to the terminal, performing N times of continuous uplink scheduling on the terminal;
the statistical unit is used for counting the uplink SNR aiming at each uplink scheduling performed by the processing unit;
the calculating unit is used for calculating the arithmetic mean value of the N SNRs counted by the counting unit;
the searching unit is used for searching the corresponding MCS index number in the mapping relation table configured by the configuration unit according to the arithmetic mean value of the SNR calculated by the calculating unit;
and the adjusting unit is used for adjusting the current uplink MCS of the terminal to the MCS corresponding to the MCS index number searched by the searching unit.
Wherein the content of the first and second substances,
the processing unit is further configured to, after the adjusting unit adjusts the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number, perform uplink scheduling for M times in a power increment manner for the terminal if it is determined that the uplink MCS for the terminal does not reach the maximum value and the cell only accesses the terminal;
the statistical unit is further configured to perform statistics on the SNR of the processing unit in each uplink scheduling;
the calculating unit is further used for calculating the weighted average value of the counted K SNRs when the Kth SNR is counted; wherein K is an integer no greater than M;
the searching unit is further configured to search a corresponding MCS index number in a configured mapping table according to the calculated weighted average of the SNRs;
the adjusting unit is further configured to adjust the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
The processing unit is further configured to determine whether the current condition is matched with a preset rule after the MCS of the terminal is adjusted according to the SNR weighted average, and if so, finish uplink scheduling in a power increment manner, and perform tracking fine adjustment on the uplink MCS of the terminal based on an error rate statistical algorithm; otherwise, the SNR of the K +1 th uplink scheduling is counted, the weighted average value of the 2 nd SNR to the K +1 th SNR is calculated, MCS adjustment is carried out, and the like, until any condition is met, the uplink scheduling in a power increment mode is finished, and the tracking fine adjustment based on the error rate statistical algorithm is carried out on the uplink MCS of the terminal.
Wherein, the preset rule is as follows: the uplink scheduling for M times in a power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR does not change any more; the difference value between the RSRP value and the value of-63.1 dBm is smaller than a preset threshold value;
the processing unit is specifically configured to determine that the current situation matches the preset rule when determining whether the current situation matches the preset rule and determining that the current situation meets any one of the preset rules; otherwise, determining that the current situation is not matched with the preset rule.
According to the technical scheme, the method is applied to a track traffic tunnel scene of an LTE system, and the adjusted MCS is determined by combining a configured mapping table through counting N SNRs and calculating an arithmetic mean of the SNRs through uplink scheduling for N times when a user message 4ACK is initially accessed or a user message 3ACK is switched for a first terminal accessed by a cell. The MCS can be quickly adjusted, and the service delay is reduced.
Drawings
Fig. 1 is a schematic flowchart illustrating a process of adjusting an uplink MCS according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a process of adjusting an uplink MCS according to a second embodiment of the present application;
fig. 3 is a schematic diagram illustrating a process of adjusting an uplink MCS according to a third embodiment of the present application;
FIG. 4 is a server side rate graph of the rail transit RHO algorithm adjusting MCS;
FIG. 5 is a server-side rate graph for adjusting MCS according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an apparatus applied to the above-described technology in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides an uplink MCS adjusting method, which is applied to a track traffic tunnel scene of an LTE system, and determines an adjusted MCS by combining a configured mapping table through counting N signal-to-noise ratios (SNRs) and calculating an arithmetic mean of the SNRs through uplink scheduling for N times when a user message 4ACK is initially accessed or a user message 3ACK is switched for a first terminal accessed by a cell. The MCS can be quickly adjusted, and the service delay is reduced.
In the embodiment of the application, the base station configures a mapping relation table of the MCS index number and the SNR according to simulation and actual test verification.
A signal-to-noise ratio threshold is configured for each MCS index, and 29 signal-to-noise ratio thresholds are configured for the MCS with the index from 0 to 28, wherein the 29 signal-to-noise ratio thresholds are respectively a first signal-to-noise ratio threshold, a second signal-to-noise ratio threshold … … and a twenty-ninth signal-to-noise ratio threshold.
The following embodiment of the present application provides an implementation of a mapping relationship table between MCS index numbers and SNRs, and when implementing the implementation, the implementation is not limited to the contents shown in table 1. Table 1 shows the contents of the mapping table of MCS index and SNR.
TABLE 1
When the MCS index number in the table 1 is 0, the corresponding SNR is not less than a first SNR threshold value and is less than a second SNR threshold value; and when the MCS index number is 1, the corresponding SNR is not less than the second SNR index value and is less than a third SNR threshold value.
Table 1 shows the corresponding relationship between SNR and MCS index, but the actual application is not limited to the method shown in the table.
According to the technical scheme, a cell is accessed to one terminal in a scene aimed at by the method, and only one terminal is accessed to the cell.
The following describes in detail a process of adjusting an uplink MCS in an embodiment of the present application with reference to the accompanying drawings.
Example one
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a process of adjusting an uplink MCS according to an embodiment of the present application. The method comprises the following specific steps:
In the embodiment of the present application, a terminal in a cell includes: terminals already on-line and terminals being accessed in the cell.
In the embodiment of the present application, on the premise that only one terminal is in a cell and access is being performed, the rapid MCS adjustment scheme provided by the present application is triggered at the following occasions in the access process:
if the current terminal is initially accessed (random access based on competition), after the base station sends Msg4 to the terminal and receives the ACK sent by the terminal, the MCS adjustment scheme provided by the application is executed, and the process of accessing the terminal is still continuously executed according to the existing implementation, that is, the process of accessing the cell by the terminal is not affected.
If the current terminal is switched to access, after receiving the Msg3 sent by the terminal, when sending ACK to the terminal, executing the MCS adjustment scheme provided by the application, and continuing to execute the process of switching to access for the terminal according to the existing implementation, that is, not affecting the process of switching to access the cell by the terminal.
The N times of continuous uplink scheduling aiming at the terminal is a process that each subframe of the base station side actively sends an uplink authorization to the terminal. N is an integer greater than 1.
And filling the TPC field with the maximum value when the Msg3 authorizes, namely filling the maximum value in the TPC field when the base station sends authorization information to the terminal, so that the terminal increases the transmitting power, and the reliability of the Msg3 is further ensured.
And step 104, the base station searches the corresponding MCS index number in the configured mapping relation table according to the calculated arithmetic mean value of the SNR.
And 105, the base station adjusts the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
In the embodiment, the uplink scheduling is added for N times in the terminal access process, and the uplink MCS of the terminal is quickly adjusted by using the counted corresponding relation between the arithmetic average value of the uplink SNR and the MCS index number. Therefore, the MCS can be quickly adjusted, and the service delay is reduced.
Example two
After the MCS is adjusted in the first embodiment, if only one terminal is currently accessed to the cell, determining whether the index number corresponding to the adjusted MCS of the terminal is the maximum value, if so, ending the adjustment scheme provided by the application, and performing tracking fine adjustment on the uplink MCS of the terminal based on an error rate statistical algorithm; otherwise, the uplink MCS adjustment is continued by using the technical solution provided in the second embodiment.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a process of adjusting an uplink MCS in the second embodiment of the present application. The method comprises the following specific steps:
When the uplink scheduling is started, TCP padding 2 or 3 of DCI0 of the terminal is used, and a value corresponding to the power increase is determined by the padding value.
The value of M is determined according to the value filled in TCP.
The DCI0 is an uplink grant for the terminal, and a TPC field for controlling the transmit power of the terminal is provided therein, and the padding of 3 is to increase the uplink transmit power by the maximum increment every time the terminal. The purpose of increasing the transmission power of the terminal is to quickly increase the uplink SNR of the corresponding terminal, thereby quickly adjusting the MCS of the user.
In step 205, the base station adjusts the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
EXAMPLE III
After the initial adjustment of the first K SNR values in the second embodiment, it is necessary to determine whether to continue the adjustment or end the adjustment of the MCS.
Referring to fig. 3, fig. 3 is a schematic diagram of a flow of adjusting an uplink MCS in a third embodiment of the present application. The method comprises the following specific steps:
K. M is an integer greater than 1;
weighted average of SNR
Comprises the following steps:
where ρ isiIs the (i + 1) th weighted average of the configuration; SNRiIs the i +1 th SNR of the K SNRs counted.
The preset rule is as follows: the uplink scheduling for M times in a power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR does not change any more; the difference between the value of RSRP and the value of-63.1 dBm is smaller than a preset threshold value.
The current situation is matched with the preset rules, namely the current situation meets any one of the preset rules: the uplink scheduling for M times in a power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR does not change any more; or the difference value between the RSRP value and the value of-63.1 dBm is smaller than a preset threshold value.
The preset threshold value determines that the RSRP is close to-63.1 dBm according to actual needs, and mainly considers that the uplink receiving overflow threshold is-60.1 dBm and the gain uncertainty of the intermediate frequency analog channel is 3 dB.
If the current situation is matched with any one of the preset rules, the rapid adjustment MCS scheme provided by the application is finished, and the tracking fine adjustment of the existing implementation is entered.
And 308, the base station counts the SNR of the K +1 th uplink scheduling, calculates the weighted average value of the counted 2 nd to K +1 th SNRs, adjusts the MCS, and so on until the current situation is matched with a preset rule, finishes the uplink scheduling in a power increment mode, and performs tracking fine adjustment on the uplink MCS of the terminal based on an error rate statistical algorithm.
The method and the device effectively shorten the adjustment time delay of the uplink MCS according to the characteristics of uplink scheduling and under the condition of basically not increasing the system processing capacity, and the user can quickly and effectively adjust the throughput after accessing.
For the condition that only one terminal is accessed to one cell, the reliability and the effectiveness of terminal transmission are fully ensured by a mode of combining rapid power increment control and MCS adjustment.
Taking the initial MCS as 4, using the existing track crossing RHO algorithm, and setting the minimum adjustment window length as 8;
in the technical scheme provided by the application, N is 4, M is 8, K is 4, rho0Is 0.6, p1Is 0.7, ρ2Is 0.8, ρ30.9 for the initial SNR of 15 db.
Referring to fig. 4, fig. 4 is a server-side rate diagram of the rail transit RHO algorithm adjusting MCS.
Referring to fig. 5, fig. 5 is a server-side rate diagram for adjusting MCS according to an embodiment of the present application.
The server side refers to a control console connected with a base station in the rail transit system and used for scheduling the terminal.
Through simulation of the above situation and referring to the simulation results of fig. 4 and fig. 5, the MCS adjustment time optimization efficiency of the scheme for adjusting MCS and the scheme for adjusting MCS by the orbital RHO algorithm provided by the embodiment of the present application is approximately 75.9%.
Based on the same inventive concept, the application also provides an uplink MCS adjusting device, which is applied to a track traffic tunnel scene of an LTE system. Referring to fig. 6, fig. 6 is a schematic structural diagram of an apparatus applied to the above technology in the embodiment of the present application. The device includes: a configuration unit 601, a processing unit 602, a statistic unit 603, a calculation unit 604, a search unit 605 and an adjustment unit 606;
a configuration unit 601, configured to configure a mapping relationship table of SNR and MCS index number;
a processing unit 602, configured to send Msg4 to a terminal and then receive an ACK sent by the terminal if the terminal initially accesses the terminal when there is only one terminal for a cell; or when receiving the Msg3 sent when the terminal switches and sending ACK to the terminal, performing N times of continuous uplink scheduling on the terminal;
a counting unit 603, configured to count an uplink SNR for each uplink scheduling performed by the processing unit 602;
a calculating unit 604 for calculating an arithmetic average of the N SNRs counted by the counting unit 603;
a searching unit 605, configured to search the mapping relation table configured by the configuration unit 601 for a corresponding MCS index according to the arithmetic average of the SNR calculated by the calculating unit 604;
an adjusting unit 606, configured to adjust the current uplink MCS of the terminal to the MCS corresponding to the MCS index number found by the searching unit 605.
Preferably, the first and second liquid crystal films are made of a polymer,
a processing unit 602, further configured to, after the adjusting unit adjusts the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number, perform uplink scheduling for M times in a power increment manner for the terminal if it is determined that the uplink MCS for the terminal does not reach the maximum value and the cell only accesses the terminal;
a counting unit 603, further configured to count the SNR at each uplink scheduling of the processing unit 602;
a calculating unit 604, further configured to calculate a weighted average of the counted K SNRs when the K SNR is counted; wherein K is an integer no greater than M;
a searching unit 605, further configured to search a corresponding MCS index number in the configured mapping table according to the calculated weighted average of the SNR;
an adjusting unit 606, further configured to adjust the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
Preferably, the first and second liquid crystal films are made of a polymer,
the processing unit 602 is further configured to determine whether the current condition is matched with a preset rule after adjusting the MCS of the terminal according to the SNR weighted average, and if so, end uplink scheduling performed in a power increment manner, and perform tracking fine adjustment on the uplink MCS of the terminal based on an error rate statistics algorithm; otherwise, the SNR of the K +1 th uplink scheduling is counted, the weighted average value of the 2 nd SNR to the K +1 th SNR is calculated, MCS adjustment is carried out, and the like, until any condition is met, the uplink scheduling in a power increment mode is finished, and the tracking fine adjustment based on the error rate statistical algorithm is carried out on the uplink MCS of the terminal.
Preferably, the first and second liquid crystal films are made of a polymer,
the preset rule is as follows: the uplink scheduling for M times in a power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR does not change any more; the difference value between the RSRP value and the value of-63.1 dBm is smaller than a preset threshold value;
the processing unit 602 is specifically configured to determine that the current situation matches the preset rule when determining whether the current situation matches the preset rule and determining that the current situation meets any one of the preset rules; otherwise, determining that the current situation does not match the preset rule
Wherein the weighted average of SNR
Comprises the following steps:
where ρ isiIs the (i + 1) th weighted average of the configuration; SNRiIs the i +1 th SNR of the K SNRs counted.
The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or further divided into a plurality of sub-units.
To sum up, the method is applied to a track traffic tunnel scenario of an LTE system, and when a user message 4ACK is initially accessed or a user message 3ACK is switched for a first terminal accessed by one cell, N SNRs are counted and an arithmetic mean value of the SNRs is calculated through uplink scheduling for N times, so as to determine an adjusted MCS in combination with a configured mapping table. The MCS can be quickly adjusted, and the service delay is reduced.
The embodiment of the application further aims at the condition that only one terminal is accessed into the cell, the scheduling is continuously carried out in a power increment mode, the weighted average value of the SNR is calculated by using the SNR counted in the scheduling process, so as to quickly adjust the uplink MCS until the current condition is satisfied that the uplink scheduling for M times in the power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR is not changed any more; or the difference value between the RSRP value and the value of-63.1 dBm is smaller than a preset threshold value. And finishing the rapid adjustment of the MCS, and tracking and fine-tuning the uplink MCS according to the existing implementation. The error rate and the time delay of the land falling can be fast and effectively, and the throughput of the system is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An uplink modulation and coding strategy MCS adjusting method is applied to a track traffic tunnel scene of a Long Term Evolution (LTE) system, and is characterized by comprising the following steps: configuring a mapping relation table of the SNR and the MCS index number;
when only one terminal exists in a cell, if the terminal is initially accessed, sending Msg4 to the terminal and then receiving an acknowledgement ACK sent by the terminal; or when receiving the Msg3 sent when the terminal switches and sending ACK to the terminal, performing N times of continuous uplink scheduling on the terminal;
counting an uplink SNR (signal to noise ratio) for each uplink scheduling;
calculating the arithmetic mean value of the N statistical SNRs;
searching a corresponding MCS index number in a configured mapping relation table according to the calculated arithmetic mean value of the SNR;
and adjusting the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
2. The method of claim 1, further comprising: the TPC field is filled with the maximum value when Msg3 grants.
3. The method of claim 1, wherein after the adjusting the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number, the method further comprises:
if the uplink MCS aiming at the terminal does not reach the maximum value and the cell only accesses the terminal, performing uplink scheduling on the terminal for M times in a power increment mode;
counting SNR of each uplink scheduling;
when the Kth SNR is counted, calculating a weighted average value of the counted K SNRs; wherein K is an integer no greater than M;
searching a corresponding MCS index number in a configured mapping table according to the calculated weighted average value of the SNR;
and adjusting the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
4. The method of claim 3, further comprising:
after the MCS of the terminal is adjusted according to the SNR weighted average value, whether the current situation is matched with a preset rule or not is determined, if so, uplink scheduling in a power increment mode is finished, and tracking fine adjustment is carried out on the uplink MCS of the terminal based on an error rate statistical algorithm; otherwise, counting the SNR of the K +1 th uplink scheduling, calculating the weighted average value of the counted 2 nd to K +1 th SNRs, adjusting the MCS, repeating the steps until any one of the preset rules is met, ending the uplink scheduling in a power increment mode, and performing tracking fine adjustment on the uplink MCS of the terminal based on an error rate statistical algorithm;
wherein, the preset rule is as follows: the uplink scheduling for M times in a power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR does not change any more; the difference value between the RSRP value and the value of-63.1 dBm is smaller than a preset threshold value;
the determining whether the current condition is matched with a preset rule includes:
when the current condition meets any one of the preset rules, determining that the current condition is matched with the preset rules; otherwise, determining that the current situation is not matched with the preset rule.
5. The method according to claim 3 or 4,
the arithmetic mean of the SNRs is:
where ρ isiIs the (i + 1) th weighted average of the configuration; SNRiIs the i +1 th SNR of the K SNRs counted.
6. An uplink Modulation and Coding Strategy (MCS) adjusting device is applied to a track traffic tunnel scene of a Long Term Evolution (LTE) system, and is characterized by comprising the following steps: the device comprises a configuration unit, a processing unit, a statistical unit, a calculation unit, a search unit and an adjustment unit;
the configuration unit is used for configuring a mapping relation table of the SNR and the MCS index number;
the processing unit is configured to send Msg4 to the terminal and then receive an ACK sent by the terminal if the terminal is initially accessed when there is only one terminal for a cell; or when receiving the Msg3 sent when the terminal switches and sending ACK to the terminal, performing N times of continuous uplink scheduling on the terminal;
the statistical unit is used for counting the uplink SNR aiming at each uplink scheduling performed by the processing unit;
the calculating unit is used for calculating the arithmetic mean value of the N SNRs counted by the counting unit;
the searching unit is used for searching the corresponding MCS index number in the mapping relation table configured by the configuration unit according to the arithmetic mean value of the SNR calculated by the calculating unit;
and the adjusting unit is used for adjusting the current uplink MCS of the terminal to the MCS corresponding to the MCS index number searched by the searching unit.
7. The apparatus of claim 6,
the processing unit is further configured to, after the adjusting unit adjusts the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number, perform uplink scheduling for M times in a power increment manner for the terminal if it is determined that the uplink MCS for the terminal does not reach the maximum value and the cell only accesses the terminal;
the statistical unit is further configured to perform statistics on the SNR of the processing unit in each uplink scheduling;
the calculating unit is further used for calculating the weighted average value of the counted K SNRs when the Kth SNR is counted; wherein K is an integer no greater than M;
the searching unit is further configured to search a corresponding MCS index number in a configured mapping table according to the calculated weighted average of the SNRs;
the adjusting unit is further configured to adjust the current uplink MCS of the terminal to the MCS corresponding to the searched MCS index number.
8. The apparatus of claim 7,
the processing unit is further configured to determine whether the current condition is matched with a preset rule after the MCS of the terminal is adjusted according to the SNR weighted average, and if so, finish uplink scheduling in a power increment manner, and perform tracking fine adjustment on the uplink MCS of the terminal based on an error rate statistical algorithm; otherwise, counting the SNR of the K +1 th uplink scheduling, calculating the weighted average value of the counted 2 nd to K +1 th SNRs, adjusting the MCS, repeating the steps until any one of the preset rules is met, ending the uplink scheduling in a power increment mode, and performing tracking fine adjustment on the uplink MCS of the terminal based on an error rate statistical algorithm;
wherein, the preset rule is as follows: the uplink scheduling for M times in a power increment mode is finished, the current MCS reaches the maximum value, and the weighted average value of the SNR does not change any more; the difference value between the RSRP value and the value of-63.1 dBm is smaller than a preset threshold value;
the processing unit is specifically configured to determine that the current situation matches the preset rule when determining whether the current situation matches the preset rule and determining that the current situation meets any one of the preset rules; otherwise, determining that the current situation is not matched with the preset rule.
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