CN112583520A - Method and equipment for adaptively selecting modulation coding scheme according to coverage level - Google Patents
Method and equipment for adaptively selecting modulation coding scheme according to coverage level Download PDFInfo
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- 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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
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Abstract
The application discloses a method for adaptively selecting a modulation coding scheme according to a coverage level, which comprises the following steps: the terminal selects one of at least two modulation coding schemes according to the coverage grade of the current signal and the principle that the coding efficiency of the selected modulation coding scheme is higher as the coverage grade is higher; wherein the coding efficiencies of the at least two modulation coding schemes are different from each other; and the terminal uses the selected modulation coding scheme to transmit the random access message. Corresponding to the method, the application also discloses a method suitable for the base station side and corresponding terminal equipment. By applying the technical scheme disclosed by the application, the success rate of terminal access can be ensured, and meanwhile, the system scheduling resource overhead and the random access time delay can be effectively reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for adaptively selecting a modulation and coding scheme according to a coverage level.
Background
With the advent of more and more wireless transmission technology, the requirement of the communication system for access delay is more and more strict, wherein the power wireless private network (LTE-G) system is such a system with high requirement for access delay.
In a communication system, a modulation coding scheme directly influences the transmission rate of data, and the transmission rate directly influences the size of random access delay; therefore, different modulation and coding schemes need to be configured for different wireless channel environments to ensure that the access delay of the terminal is reduced as much as possible within a reasonable range.
In order to ensure the reliability of the communication system, the LTE-G system adopts the lowest order modulation coding scheme for all coverage classes to ensure the access success rate of the terminal, but the lowest order modulation coding scheme causes a large access delay. This is because: the modulation coding scheme is determined based on a modulation coding strategy and the Number of radio frames (NF: Number of frames) occupied by code blocks. In practical application, the low-order modulation and coding strategy causes the number of radio frames occupied by data to increase, thereby causing the access delay of the terminal to be longer.
As described above, the existing LTE-G system adopts the lowest order modulation and coding scheme, i.e., the lower order modulation and coding strategy and the number of radio frames occupied by longer code blocks, thereby ensuring the success rate of terminal access, reducing the throughput of the communication system in unit time, and reducing the data transmission rate. However, the existing scheme may cause waste of communication spectrum resources under a better channel condition, and a low transmission rate may directly cause a long access delay, which affects the end-to-end performance of the LTE-G communication system.
Disclosure of Invention
The application provides a method and equipment for adaptively selecting a modulation coding scheme according to a coverage grade, which can effectively reduce the system scheduling resource overhead and the random access time delay while ensuring the access success rate of a terminal.
The application discloses a method for adaptively selecting a modulation coding scheme according to a coverage level, which comprises the following steps:
the terminal selects one of at least two modulation coding schemes according to the coverage grade of the current signal and the principle that the coding efficiency of the selected modulation coding scheme is higher as the coverage grade is higher; wherein the coding efficiencies of the at least two modulation coding schemes are different from each other;
and the terminal uses the selected modulation coding scheme to transmit the random access message.
Preferably, the at least two modulation and coding schemes include: a dedicated modulation coding scheme and a general modulation coding scheme;
wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme.
Preferably, the selecting one of the at least two modulation and coding schemes specifically includes:
selecting the dedicated modulation coding scheme when the coverage level of the current signal is above a set first threshold;
otherwise, the generic modulation coding scheme is selected.
Preferably, if the terminal selects the dedicated modulation and coding scheme, after the terminal uses the selected modulation and coding scheme for sending the random access message, the method further includes:
and the terminal sends the random access message again by using the general modulation coding scheme.
The application also discloses a terminal device, including: a scheme selection module and a random access module, wherein:
the scheme selection module is used for selecting one of at least two modulation coding schemes according to the coverage grade of the current signal and the principle that the coding efficiency of the selected modulation coding scheme is higher as the coverage grade is higher; wherein the coding efficiencies of the at least two modulation coding schemes are different from each other;
and the random access module is used for sending a random access message by using the modulation and coding scheme selected by the scheme selection module.
Preferably, the at least two modulation and coding schemes include: a dedicated modulation coding scheme and a general modulation coding scheme; wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme;
the scheme selection module is specifically configured to: selecting the dedicated modulation coding scheme when the coverage level of the current signal is above a set first threshold; otherwise, the generic modulation coding scheme is selected.
Preferably, if the scheme selection module selects the dedicated modulation and coding scheme, the random access module further transmits the random access message again using the general modulation and coding scheme after transmitting the random access message using the dedicated modulation and coding scheme.
The application also discloses a method for adaptively selecting a modulation coding scheme according to the coverage level, which comprises the following steps:
after receiving a random access request initiated by a terminal, a base station sends MSG2 to the terminal;
the base station selects one of at least two modulation coding schemes to analyze the MSG3 according to the period of receiving the MSG 3; wherein coding efficiencies of the at least two modulation coding schemes are different from each other.
Preferably, the at least two modulation and coding schemes include: a dedicated modulation coding scheme and a general modulation coding scheme;
wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme;
the base station receives the MSG3 using the dedicated modulation and coding scheme and parses the MSG3 using the dedicated modulation and coding scheme within a scheduling period of the MSG 2.
Preferably, if the base station fails to successfully receive the MSG3 using the dedicated modulation and coding scheme within the scheduling period of the MSG2, the method further comprises:
and the base station receives and analyzes the MSG3 sent again by the terminal by adopting the general modulation coding scheme.
According to the technical scheme, the method and the equipment for adaptively selecting the modulation coding scheme according to the coverage grade select the modulation coding scheme with the corresponding coding efficiency by the base station and the terminal based on the coverage grade of the current signal, so that the terminal can select the modulation coding scheme with higher coding efficiency under the conditions of good channel quality and high coverage grade to reduce the random access time delay and the overhead of system scheduling resources; and under the conditions of poor channel quality and low coverage level, the terminal can select a modulation coding scheme with lower coding efficiency to ensure the access success rate of the terminal. Therefore, on one hand, the technical scheme provided by the invention improves the utilization rate of scheduling resources by dynamically adjusting the modulation and coding scheme, and on the other hand, the technical scheme provided by the invention optimizes the modulation and coding scheme with higher coding efficiency and reduces the random access time delay.
In addition, after the data is uploaded by adopting the modulation coding scheme with higher coding efficiency, the uplink data is transmitted again by adopting the modulation coding scheme with lower coding efficiency, and by increasing the redundant uplink data transmission, two indexes of the terminal access success rate and the random access time delay are balanced, so that the terminal access success rate is ensured, and the random access time delay is greatly reduced.
Drawings
Fig. 1 is a diagram illustrating a random access procedure under a general modulation and coding scheme and a dedicated modulation and coding scheme according to a preferred embodiment of the present application;
FIG. 2 is a schematic diagram of a base station side process flow in a preferred embodiment of the present application;
FIG. 3 is a schematic diagram of a terminal-side processing flow in a preferred embodiment of the present application;
fig. 4 is a schematic structural diagram of a terminal device according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
To solve the above problems in the prior art, the present application provides a method for adaptively selecting a modulation coding scheme according to a coverage level, which is schematically shown in fig. 1 and includes the following steps:
firstly, at least two modulation coding schemes are set, and the coding efficiencies of the at least two modulation coding schemes are different from each other.
Here, at least two modulation and coding schemes available for the base station and the terminal may be set based on the modulation and coding scheme and the number of radio frames occupied by code blocks.
Preferably, two modulation coding schemes can be set, namely: the modulation and coding method comprises a special modulation and coding scheme and a general modulation and coding scheme, wherein the general modulation and coding scheme is the lowest order modulation and coding scheme, and the coding efficiency of the special modulation and coding scheme is higher than that of the general modulation and coding scheme.
Then, the terminal selects one of the at least two modulation coding schemes according to the coverage level of the current signal and according to the principle that the coding efficiency of the selected modulation coding scheme is higher as the coverage level is higher.
The coverage classes are sequentially divided into a coverage class 1, a coverage class 2 and a coverage class 3 from high to low according to the channel quality.
Taking the example of setting two modulation and coding schemes, a coverage level threshold, such as coverage level 1, is set. Based on the coverage level of the current signal, when the coverage level of the current signal is equal to 1, the channel quality is good, and the terminal selects a special modulation coding scheme with higher coding efficiency; when the coverage level of the current signal is greater than 1, indicating that the channel quality is poor, the terminal selects a general modulation coding scheme.
And finally, the terminal transmits the random access message by using the selected modulation coding scheme.
If the terminal selects the special modulation coding scheme, the terminal can transmit uplink data by using fewer scheduling resources, thereby effectively reducing the system scheduling resource overhead and the random access time delay.
On the basis of the above scheme, in order to ensure the access success rate of the terminal, after the terminal transmits uplink data by using the dedicated modulation and coding scheme, the terminal may continue to transmit the uplink data again by using the alternative general modulation and coding scheme. And if the base station does not receive the uplink data transmitted by the terminal under the special modulation coding scheme, continuing to wait for the terminal to transmit the uplink data by using the alternative general modulation coding scheme. This situation, in which the base station does not receive the uplink data transmitted by the terminal under the dedicated modulation and coding scheme, occurs with a very small probability.
The above detailed description is about the method for adaptively selecting a modulation coding scheme according to the coverage level at the terminal side, and correspondingly, the present invention further provides a method for adaptively selecting a modulation coding scheme according to the coverage level at the base station side, which includes:
after receiving a random access request initiated by a terminal, a base station sends MSG2 to the terminal;
the base station selects one of at least two modulation coding schemes to analyze the MSG3 according to the period of receiving the MSG 3; wherein coding efficiencies of the at least two modulation coding schemes are different from each other.
As previously mentioned, the at least two modulation coding schemes may include: a dedicated modulation coding scheme and a general modulation coding scheme; wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme;
the base station receives the MSG3 using the dedicated modulation and coding scheme and parses the MSG3 using the dedicated modulation and coding scheme within a scheduling period of the MSG 2.
As described above, in order to ensure the access success rate of the base station, after transmitting uplink data by using the dedicated modulation and coding scheme, the terminal continues to transmit uplink data again by using the alternative general modulation and coding scheme, so that, on the base station side, if the base station fails to successfully receive the MSG3 by using the dedicated modulation and coding scheme within the scheduling period of the MSG2, the base station continues to receive and parse the MSG3, which is retransmitted by the terminal, by using the general modulation and coding scheme.
According to the method for adaptively selecting the modulation coding scheme according to the coverage grade, the base station and the terminal select the modulation coding scheme corresponding to the coding efficiency based on the coverage grade of the current signal, so that the terminal can select the modulation coding scheme with higher coding efficiency under the conditions of good channel quality and high coverage grade to reduce the random access time delay and the overhead of system scheduling resources; and under the conditions of poor channel quality and low coverage level, the terminal can select a modulation coding scheme with lower coding efficiency to ensure the access success rate of the terminal. Therefore, on one hand, the technical scheme provided by the invention improves the utilization rate of scheduling resources by dynamically adjusting the modulation and coding scheme, and on the other hand, the technical scheme provided by the invention optimizes the modulation and coding scheme with higher coding efficiency and reduces the random access time delay.
In addition, the invention balances two indexes of the terminal access success rate and the random access time delay through a redundant general modulation coding scheme, thereby greatly reducing the random access time delay while ensuring the terminal access success rate.
The technical solution of the present application is further described in detail by a preferred embodiment with reference to the accompanying drawings.
In this embodiment, two different modulation and coding schemes for the base station and the terminal are set for different coverage levels: general modulation coding scheme and dedicated modulation coding scheme, as shown in table 1:
table 1 modulation coding scheme and parameter correspondence table
| Universal modulation coding scheme | Dedicated modulation coding scheme | |
| Plan numbering | 1 | 2 |
| MCS | MCS0 | MCS1 |
| NF | NF0 | NF1 |
Wherein:
the Chinese and English of MCS are all called as: modulation and Coding Scheme, Modulation Coding Scheme;
the Chinese and English names of NF are all known as: number of frames, Number of radio frames, i.e.: the number of the code blocks occupies the radio frame.
In Table 1, MCS0Is MCS, MCS under the lowest order modulation coding scheme1Is MCS under a higher order modulation coding scheme; NF0Corresponding to the MCS0Number of radio frames, NF, occupied by one-time scheduling of data when modulating a coding scheme1Corresponding to the MCS1The number of radio frames occupied by one-time scheduling of data when modulating the coding scheme, hence NF0Specific ratio of NF1Is large.
A comparison diagram of the random access procedure under the general modulation and coding scheme and the special modulation and coding scheme is shown in fig. 1. In fig. 1, the horizontal axis is a time axis, each square represents one radio frame, and two radio frames are one PDCCH period; the upper part of fig. 1 is a base station scheduling scheme based on a general modulation coding scheme, and the lower part is a base station scheduling scheme based on a special modulation coding scheme.
The random access procedure shown in fig. 1 includes the following steps:
step 1: a terminal initiates random access in a certain radio frame through a Physical Random Access Channel (PRACH), as shown in the figure.
This step is the same process for general modulation coding scheme and dedicated modulation coding scheme based.
Step 2: in the next PDCCH cycle for the terminal to send PRACH, the PRACH is transmitted by the Base Band (BB) to the Medium Access Control (MAC) layer inside the base station, as shown in the figure by BB- > MAC PRACH.
This step is the same process for the general modulation coding scheme and the dedicated modulation coding scheme.
And step 3: after receiving the MSG2 from the base station, the terminal selects a corresponding modulation and coding scheme according to its coverage level. If the coverage grade is low and the channel quality is poor, selecting a general modulation coding scheme; if the coverage level is high and the channel quality is good, a special modulation coding scheme is selected.
And 4, step 4: the terminal performs transmission of MSG3 and reception of MSG4 according to the modulation and coding scheme selected in step 3. This step will take different treatments for the generic modulation coding scheme and the dedicated modulation coding scheme, specifically:
if the coverage level is low and the channel quality is poor, the general modulation coding scheme is adopted to transmit the MSG3 in the 4 th PDCCH period after access. In this case, as shown in the upper part of the figure, the base station scheduling layer receives MSG3 in the 4 th PDCCH period after the terminal accesses (i.e. the radio frame where BB- > MAC PRACH is located), and sends MSG3 to the higher layer in this period, the higher layer receives MSG3 and then sends MSG4 in the 5 th PDCCH period after the terminal accesses, and the scheduling layer sends MSG4 to the terminal in the 6 th PDCCH period, as shown in CP- > MAC MSG4 in the figure.
If the coverage level is high and the channel quality is good, the terminal defaults to adopt a special modulation coding scheme to transmit the MSG3 in the 3 rd PDCCH period after access. In this case, as shown in the lower half of the figure, the base station scheduling layer receives MSG3 with a dedicated modulation and coding scheme in the same period as MSG2 is transmitted, so MSG3 is received by the base station in the 3 rd PDCCH period after the terminal accesses, and then the scheduling of MSG4 is performed one PDCCH period earlier than the general modulation and demodulation scheme.
And 5: in order to ensure the access success rate, if the terminal selects the dedicated modulation and coding scheme, the terminal transmits MSG3 again in the next PDCCH period after sending MSG3, i.e. the 4 th PDCCH period after random access, using the general modulation and coding scheme, as shown in the lower half BB- > MAC MSG 3. The dotted line in the figure shows that after a message is transmitted using the dedicated modulation and coding scheme, the message is transmitted again using the general modulation and coding scheme.
Step 6: the terminal performs MSG5 upload.
The test standards specify: the random access delay starts from the base station receiving MSG3 until MSG5 is successfully received. In this embodiment, two examples of random access procedures using a general modulation and coding scheme and a dedicated modulation and coding scheme for the same terminal are illustrated.
Because the external environment is fixed, the MSG5 scheduling of the two MSGs uniformly adopts the consistent traditional modulation coding parameters, and the uploading delay of the MSG5 is set to be mu x Tpdcch. Wherein, TpdcchRepresenting a PDCCH scheduling period.
Setting the random access time delay of the terminal under the general modulation coding scheme as T1Then T is1＝3*Tpdcch+μ*Tpdcch＝(μ+3)Tpdcch；
Setting the random access time delay of the terminal under the special modulation coding scheme as T2Then T is2＝2*Tpdcch+μ*Tpdcch＝(μ+2)Tpdcch；
Data transmission time delay T of redundant general modulation coding scheme under special modulation coding scheme in figure3＝T1。
Let the access success rate of the terminal under the special modulation coding scheme be p1The probability of failure with the dedicated modulation coding scheme and success with the generic modulation coding scheme is p2For the user with high coverage level, on the premise of ensuring the access success rate, the average time delay of the terminal random access is as follows:
T＝p1*T2+p2*T3＝p1((μ+2)Tpdcch)+p2((μ+3)Tpdcch)。
the access success rate of the terminal under the special modulation coding scheme is p1Is relatively large, and by comparison can be seen: relative to T1The invention proposesThe access time delay under the new code modulation scheme can be greatly reduced.
In this embodiment, the base station side processing flow is shown in fig. 2, and is described as follows:
1. the base station receives a random access request initiated by the terminal.
2. The base station transmits MSG2 to the terminal.
3. The base station judges whether MSG3 is received in the MSG2 scheduling period, if MSG3 is received in the MSG2 scheduling period, 4 is executed, otherwise, 5 is executed.
4. MSG3 is parsed using a dedicated modulation coding scheme.
5. MSG3 is parsed using a generic modulation coding scheme.
6. Transmitting MSG4, receiving MSG5.
7. The random access is completed.
In this embodiment, the terminal side processing flow is as shown in fig. 3, and is described as follows:
1. the terminal initiates a random access procedure.
2. The terminal determines its coverage level, and if the coverage level is high, executes step 3, and if the coverage level is low, executes step 5.
3. MSG3 is uploaded using a dedicated modulation coding scheme.
4. The MSG3 is again uploaded with the common modulation coding scheme in the next cycle.
5. The MSG3 is uploaded directly using the generic modulation coding scheme.
6. After completing the transfer of the MSG3, the terminal receives MSG4, uploads MSG 5;
7. the random access is completed.
Corresponding to the method provided by the present invention, the present invention also provides a terminal device, whose composition structure is shown in fig. 4, including: a scheme selection module and a random access module, wherein:
the scheme selection module is used for selecting one of at least two modulation coding schemes according to the coverage grade of the current signal and the principle that the coding efficiency of the selected modulation coding scheme is higher as the coverage grade is higher; wherein the coding efficiencies of the at least two modulation coding schemes are different from each other;
and the random access module is used for sending a random access message by using the modulation and coding scheme selected by the scheme selection module.
Wherein the at least two modulation coding schemes comprise: a dedicated modulation coding scheme and a general modulation coding scheme; wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme;
the scheme selection module is specifically configured to: selecting the dedicated modulation coding scheme when the coverage level of the current signal is above a set first threshold; otherwise, the generic modulation coding scheme is selected.
Preferably, if the scheme selection module selects the dedicated modulation and coding scheme, the random access module further transmits the random access message again using the general modulation and coding scheme after transmitting the random access message using the dedicated modulation and coding scheme.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. A method for adaptively selecting a modulation coding scheme according to a coverage level, comprising:
the terminal selects one of at least two modulation coding schemes according to the coverage grade of the current signal and the principle that the coding efficiency of the selected modulation coding scheme is higher as the coverage grade is higher; wherein the coding efficiencies of the at least two modulation coding schemes are different from each other;
and the terminal uses the selected modulation coding scheme to transmit the random access message.
2. The method of claim 1, wherein:
the at least two modulation coding schemes include: a dedicated modulation coding scheme and a general modulation coding scheme;
wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme.
3. The method according to claim 2, wherein said selecting one of the at least two modulation and coding schemes comprises:
selecting the dedicated modulation coding scheme when the coverage level of the current signal is above a set first threshold;
otherwise, the generic modulation coding scheme is selected.
4. The method of claim 3, wherein:
if the terminal selects the dedicated modulation and coding scheme, after the terminal uses the selected modulation and coding scheme for sending the random access message, the method further comprises the following steps:
and the terminal sends the random access message again by using the general modulation coding scheme.
5. A terminal device, comprising: a scheme selection module and a random access module, wherein:
the scheme selection module is used for selecting one of at least two modulation coding schemes according to the coverage grade of the current signal and the principle that the coding efficiency of the selected modulation coding scheme is higher as the coverage grade is higher; wherein the coding efficiencies of the at least two modulation coding schemes are different from each other;
and the random access module is used for sending a random access message by using the modulation and coding scheme selected by the scheme selection module.
6. The terminal device of claim 5, wherein:
the at least two modulation coding schemes include: a dedicated modulation coding scheme and a general modulation coding scheme; wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme;
the scheme selection module is specifically configured to: selecting the dedicated modulation coding scheme when the coverage level of the current signal is above a set first threshold; otherwise, the generic modulation coding scheme is selected.
7. The method of claim 6, wherein:
if the scheme selection module selects the special modulation coding scheme, the random access module further transmits the random access message again by using the general modulation coding scheme after transmitting the random access message by using the special modulation coding scheme.
8. A method for adaptively selecting a modulation coding scheme according to a coverage level, comprising:
after receiving a random access request initiated by a terminal, a base station sends MSG2 to the terminal;
the base station selects one of at least two modulation coding schemes to analyze the MSG3 according to the period of receiving the MSG 3; wherein coding efficiencies of the at least two modulation coding schemes are different from each other.
9. The method of claim 8, wherein:
the at least two modulation coding schemes include: a dedicated modulation coding scheme and a general modulation coding scheme;
wherein the general modulation coding scheme is the lowest order modulation coding scheme, and the special modulation coding scheme has higher coding efficiency than the general modulation coding scheme;
the base station receives the MSG3 using the dedicated modulation and coding scheme and parses the MSG3 using the dedicated modulation and coding scheme within a scheduling period of the MSG 2.
10. The method of claim 9, wherein if the base station fails to successfully receive the MSG3 using the dedicated modulation and coding scheme within a scheduling period of the MSG2, the method further comprises:
and the base station receives and analyzes the MSG3 sent again by the terminal by adopting the general modulation coding scheme.
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| CN107548106A (en) * | 2016-06-24 | 2018-01-05 | 华为技术有限公司 | A kind of covering grade switching method, base station and terminal |
| CN109218361A (en) * | 2017-07-03 | 2019-01-15 | 中国移动通信有限公司研究院 | The method and base station that a kind of pair of internet-of-things terminal is scheduled |
| CN110139313A (en) * | 2018-02-08 | 2019-08-16 | 中国移动通信有限公司研究院 | Report method, resource regulating method and the communication equipment of coverage enhancement grade |
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Application publication date: 20210330 |