CN102624501A - Method and apparatus for sending channel quality indication - Google Patents
Method and apparatus for sending channel quality indication Download PDFInfo
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- CN102624501A CN102624501A CN201110034000XA CN201110034000A CN102624501A CN 102624501 A CN102624501 A CN 102624501A CN 201110034000X A CN201110034000X A CN 201110034000XA CN 201110034000 A CN201110034000 A CN 201110034000A CN 102624501 A CN102624501 A CN 102624501A
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Abstract
The invention provides a method for sending channel quality indication. The method comprises that: channel quality indication supporting a 256 quadrature amplitude modulation (QAM) mode is newly increased; and user equipment receives a pilot signal sent by a base station, carries out channel measurement according to the pilot signal and feedbacks current channel quality indication to the base station. Besides, provided is an apparatus for sending channel quality indication. According to the invention, a 256 QAM modulation mode is supported and the system throughput is improved.
Description
Technical field
The present invention relates to GSM, relate in particular to a kind of method and apparatus of transmitting channel quality indication.
Background technology
In GSM, become during owing to wireless fading channel, make communication process have a large amount of uncertainties; In order to improve throughput of system, adopt the higher high order modulation of transmission rate and few redundant correcting sign indicating number to communicate on the one hand, throughput of system is greatly improved really when the wireless fading channel signal to noise ratio is more satisfactory like this; But, channel then can't ensure that reliable communications stably carries out when being in deep fade, on the other hand, and in order to ensure the reliability of communication; Adopt lower low-order-modulated of transmission rate and big redundant correcting sign indicating number to communicate, promptly when wireless channel is in deep fade, ensure stable the carrying out of reliable communications, yet when the channel signal to noise ratio is higher; Because transmission rate is lower; Restrict the raising of throughput of system, thereby caused the waste of resource, early stage in the development of mobile communication technology; People resist the time-varying characteristics of wireless fading channel; Can only adopt the transmitting power that strengthens transmitter, use the modulation coding method of the big redundancy of low order to come the communication quality of safeguards system when the channel deep fade, also have no time to think it over and how to improve the throughput of system; Progress along with technical merit; Occurred and to have regulated its transmitting power adaptively according to channel status, thereby the frame length of modulation coding mode and data overcomes the technology that the time-varying characteristics of channel obtain the optimal communication effect, is called as adaptive technique.
The highest support of uplink and downlink 64QAM (Quadrature AmplitudeModulation in the existing standard; Quadrature amplitude modulation) modulation coding mode; In order to improve the speed data transmission, compatible existing wireless-transmission network, the modulation coding mode of the highest support 256QAM.But do not support the related realization method of the modulation coding mode of 256QAM in the prior art.
Summary of the invention
The technical problem that the present invention will solve provides a kind of method and apparatus of transmitting channel quality indication.
In order to address the above problem, the invention provides a kind of method of transmitting channel quality indication, comprising:
The newly-increased channel quality indication of supporting the 256QAM modulation system;
Subscriber equipment receives the pilot signal that send the base station, carries out channel measurement according to said pilot signal, to the current channel quality indication of said base station feedback.
Further, said method also can have following characteristics, and said method comprises that also said base station is indicated according to said channel quality, selects modulation coding mode, issues data.
Further, said method also can have following characteristics, the channel quality indication of said newly-increased support 256QAM modulation system comprise following one or more:
Modulation system is 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797;
Modulation system is 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000;
Modulation system is 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125;
Modulation system is 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
Further, said method also can have following characteristics, indicates through the channel quality of the newly-increased 256QAM of support of following mode modulation system:
Newly-increased channel quality indication index bit uses the channel quality indication of the newly-increased said support of channel quality indication index indication 256QAM modulation system.
Further, said method also can have following characteristics, and the channel quality indication of the said support of the channel quality indication index indication 256QAM modulation system that said use is newly-increased comprises:
Newly-increased channel quality indication index 16,17, wherein channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Newly-increased channel quality indication index 16,17,18, wherein, channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 18 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
Further, said method also can have following characteristics, indicates through the channel quality of the newly-increased 256QAM of support of following mode modulation system:
Use the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication index.
Further, said method also can have following characteristics, and the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication of the said use index comprises:
Channel quality indication index 14 indicating modulation modes are 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Channel quality indication index 13 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 14 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
The present invention also provides a kind of device of transmitting channel quality indication, comprising:
Dispensing unit is used for the channel quality indication of the newly-increased 256QAM of support modulation system;
Transmitting element is used to receive the pilot signal that send the base station, carries out channel measurement according to said pilot signal, to the current channel quality indication of said base station feedback.
Further, said apparatus also can have following characteristics, the channel quality indication of the support 256QAM modulation system that said dispensing unit is newly-increased comprise following one or more:
Modulation system is 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797;
Modulation system is 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000;
Modulation system is 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125;
Modulation system is 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
Further, said apparatus also can have following characteristics, and said dispensing unit is the channel quality indication that is used for through the newly-increased 256QAM of support of following mode modulation system:
Newly-increased channel quality indication index bit uses the channel quality indication of the newly-increased said support of channel quality indication index indication 256QAM modulation system.
Further, said apparatus also can have following characteristics, and said dispensing unit is to be used for: newly-increased channel quality indication index 16,17, and wherein channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Newly-increased channel quality indication index 16,17,18, wherein, channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 18 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
Further, said apparatus also can have following characteristics, and said dispensing unit is the channel quality indication that is used for through the newly-increased 256QAM of support of following mode modulation system:
Use the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication index.
Further, said apparatus also can have following characteristics, and said dispensing unit is to be used for: use channel quality indication index 14 indicating modulation modes to be 256QAM, code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Channel quality indication index 13 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 14 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
The method of transmitting channel quality indication provided by the invention, the modulation system of support 256QAM improves throughput of system.
Description of drawings
Fig. 1 is a down direction, and the user is through the channel quality indication of table 4 feedback, and base station selected suitable modulating coded system issues the method sketch map of data;
Fig. 2 is a down direction, and the user is through the channel quality indication of table 5 feedback, and base station selected suitable modulating coded system issues the method sketch map of data;
Fig. 3 is a down direction, and the user is through the channel quality indication of table 2 feedback, and base station selected suitable modulating coded system issues the method sketch map of data;
Fig. 4 is a down direction, and the user is through the channel quality indication of table 3 feedback, and base station selected suitable modulating coded system issues the method sketch map of data.
Embodiment
The present invention provides a kind of method of transmitting channel quality indication, comprising:
A, the newly-increased channel quality indication of supporting the 256QAM modulation system;
B, the base station is to the subscriber equipment pilot signal transmitted;
C, subscriber equipment receive said pilot signal, carry out channel measurement according to said pilot signal, to the current channel quality indication of said base station feedback.
Said method also comprises: indicate according to said channel quality the base station, selects modulation coding mode, issues data.
Among the said step a; The channel quality indication of newly-increased support 256QAM modulation system comprises any one or a few in the following table 1, and wherein a kind of channel quality indication of each row representative: wherein, modulation is a modulation system; Code rate is a code check, and efficiency is a spectrum efficiency.
Table 1 increases CQI newly
| modulation | code?rate?x?1024 | Efficiency |
| 256QAM | 791 | 6.1797 |
| 256QAM | 832 | 6.5000 |
| 256QAM | 872 | 6.8125 |
| 256QAM | 952 | 7.4375 |
Further, among the step a, on the basis of the channel quality indication bit of existing system, increase one or more bits, thereby the channel quality indication of the modulation system of 256QAM is supported in the indication of newly-increased one or more channel qualities indication index.
Further; Among the step a; The invariable number that keeps channel quality indication bit in the existing system; Content to the channel quality indication reinterprets, and to support the modulation system of 256QAM, promptly uses the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication index.
Particularly; The content that reinterprets can be the content of following table 2; Wherein along with the increase of CQI (channel quality indication, Channel Quality Indicator) index, spectrum efficiency and order of modulation increase progressively gradually; And the highest support of order of modulation 256QAM: wherein, CQI index is a channel quality indication index.
Table 2 reinterprets the CQI table
Concrete, the CQI table that reinterprets can also have following form:
Table 3 reinterprets the CQI table
Table 2, table 3 is merely example; Can use the channel quality indication of the newly-increased support 256QAM of existing other CQI index indication as required.
Method embodiment 1
Fig. 1 is in the embodiment of the invention, and subscriber equipment receives the pilot signal that send the base station, uses than original system Duo the CQI of several bits to the base station feedback channel quality, and the base station is according to this channel quality indication, and selection suitable modulating coded system issues the process of data.
As shown in table 4, on the basis of the original 4 bit CQI indication of system, increase by 1 bit, be used to indicate 2 grades of CQI that increase newly, these 2 grades of modulation systems that CQI is used to indicate 256QAM are like the CQI Index 16 and the CQI Index 17 of table 4.CQI after the increase indicates with 5 bits.
The base station is to the subscriber equipment pilot signal transmitted; Subscriber equipment receives pilot signal and indicates to the base station feedback channel quality: for example the CQI index of subscriber equipment feedback is 16; Its implication is that current down link modulation system applicatory is 256QAM, and code check is 832/1024.The suitable modulating coded system is selected according to this CQI index in the base station, and issues data.
The CQI table that table 4 is newly-increased 2 grades
Method embodiment 2
Fig. 2 is in the embodiment of the invention, and subscriber equipment receives the pilot signal that send the base station, uses than original system Duo the CQI of several bits to the base station feedback channel quality, and the base station is according to this channel quality indication, and selection suitable modulating coded system issues the process of data.
As shown in table 5, on the basis of 4 bit CQI of original system indication, increase by 1 bit and be used to indicate 3 grades of CQI that increase newly, these 3 grades of modulation systems that CQI is used to indicate 256QAM are like CQI Index 16, CQI Index 17 and the CQI Index 18 of table 5.CQI after the increase indicates with 5 bits.
The base station is to the subscriber equipment pilot signal transmitted; Subscriber equipment receives pilot signal and indicates to the base station feedback channel quality: for example; The CQI index of subscriber equipment feedback equals 18, and its implication is that current down link modulation system applicatory is 256QAM, and code check is about 952/1024.The suitable modulating coded system is selected according to this CQIindex in the base station, and issues data.
The CQI table that table 5 is newly-increased 3 grades
Table 4 table 5 is merely example, and the channel quality indication of the modulation system of 256QAM is supported in the CQI index indication that also can increase other newly.
Method embodiment 3
Fig. 3 is in the embodiment of the invention; Subscriber equipment receives the pilot signal that send the base station; Use and the same number of CQI bit of original system are to the base station feedback channel quality, and the base station reinterprets the content of CQI indication according to this channel quality indication; And select the suitable modulating coded system, issue the process of data.
When the base station to the subscriber equipment pilot signal transmitted, subscriber equipment receives pilot signal and indicates to the base station feedback channel quality: at this moment the base station utilizes the indicated CQI Index of table 2 to reinterpret the content of CQI indication.
For example, the CQI Index of subscriber equipment feedback equals 14, and the implication in original system is that current down link modulation system applicatory is 64QAM, and code check is about 873/1024.And this moment, the base station utilized the indicated content of table 2 to be re-interpreted as: current down link modulation system applicatory is 256QAM, and code check is about 832/1024, and selects the suitable modulating coded system according to this CQI index, issues data.
Method embodiment 4
Fig. 4 is in the embodiment of the invention; Subscriber equipment receives the pilot signal that send the base station; Use and the same number of CQI bit of original system are to the base station feedback channel quality, and the base station reinterprets the content of CQI indication according to this channel quality indication; And select the suitable modulating coded system, issue the process of data.
When the base station to the subscriber equipment pilot signal transmitted, subscriber equipment receives pilot signal and indicates to the base station feedback channel quality: at this moment the base station utilizes the indicated CQI Index of table 3 to reinterpret the content of CQI indication.
For example, the CQI Index of subscriber equipment feedback equals 14, and the implication in original system is that current down link modulation system applicatory is 64QAM, and code check is about 873/1024.And this moment, the base station utilized the indicated content of table 3 to be re-interpreted as: current down link modulation system applicatory is 256QAM, and code check is about 872/1024, and selects the suitable modulating coded system according to this CQI index, issues data.
The present invention also provides a kind of device of transmitting channel quality indication, comprising:
Dispensing unit is used for the channel quality indication of the newly-increased 256QAM of support modulation system;
Transmitting element is used to receive the pilot signal that send the base station, carries out channel measurement according to said pilot signal, to the current channel quality indication of said base station feedback.
Wherein, the channel quality indication of the newly-increased support 256QAM modulation system of said dispensing unit comprise following one or more:
Modulation system is 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797;
Modulation system is 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000;
Modulation system is 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125;
Modulation system is 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
Wherein, said dispensing unit is the channel quality indication that is used for through the newly-increased 256QAM of support of following mode modulation system:
Newly-increased channel quality indication index bit uses the channel quality indication of the newly-increased said support of channel quality indication index indication 256QAM modulation system.
Wherein, said dispensing unit is to be used for: newly-increased channel quality indication index 16,17, and wherein channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Newly-increased channel quality indication index 16,17,18, wherein, channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 18 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
Wherein, said dispensing unit is the channel quality indication that is used for through the newly-increased 256QAM of support of following mode modulation system:
Use the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication index.
Wherein, said dispensing unit is to be used for: use channel quality indication index 14 indicating modulation modes to be 256QAM, code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Channel quality indication index 13 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 14 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (13)
1. the method for a transmitting channel quality indication is characterized in that, comprising:
The newly-increased channel quality indication of supporting the 256QAM modulation system;
Subscriber equipment receives the pilot signal that send the base station, carries out channel measurement according to said pilot signal, to the current channel quality indication of said base station feedback.
2. the method for claim 1 is characterized in that, said method comprises that also said base station is indicated according to said channel quality, selects modulation coding mode, issues data.
3. the method for claim 1 is characterized in that, the channel quality indication of said newly-increased support 256QAM modulation system comprise following one or more:
Modulation system is 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797;
Modulation system is 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000;
Modulation system is 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125;
Modulation system is 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
4. the method for claim 1 is characterized in that, indicates through the channel quality of the newly-increased 256QAM of support of following mode modulation system:
Newly-increased channel quality indication index bit uses the channel quality indication of the newly-increased said support of channel quality indication index indication 256QAM modulation system.
5. method as claimed in claim 4 is characterized in that, the channel quality indication of the said support of the channel quality indication index indication 256QAM modulation system that said use is newly-increased comprises:
Newly-increased channel quality indication index 16,17, wherein channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Newly-increased channel quality indication index 16,17,18, wherein, channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 18 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
6. the method for claim 1 is characterized in that, indicates through the channel quality of the newly-increased 256QAM of support of following mode modulation system:
Use the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication index.
7. method as claimed in claim 6 is characterized in that, the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication of the said use index comprises:
Channel quality indication index 14 indicating modulation modes are 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Channel quality indication index 13 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 14 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
8. the device of a transmitting channel quality indication is characterized in that, comprising:
Dispensing unit is used for the channel quality indication of the newly-increased 256QAM of support modulation system;
Transmitting element is used to receive the pilot signal that send the base station, carries out channel measurement according to said pilot signal, to the current channel quality indication of said base station feedback.
9. device as claimed in claim 8 is characterized in that, the channel quality indication of the support 256QAM modulation system that said dispensing unit is newly-increased comprise following one or more:
Modulation system is 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797;
Modulation system is 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000;
Modulation system is 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125;
Modulation system is 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
10. device as claimed in claim 8 is characterized in that, said dispensing unit is the channel quality indication that is used for through the newly-increased 256QAM of support of following mode modulation system:
Newly-increased channel quality indication index bit uses the channel quality indication of the newly-increased said support of channel quality indication index indication 256QAM modulation system.
11. device as claimed in claim 10 is characterized in that,
Said dispensing unit is to be used for: newly-increased channel quality indication index 16,17, and wherein channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Newly-increased channel quality indication index 16,17,18, wherein, channel quality indication index 16 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 17 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 18 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
12. device as claimed in claim 8 is characterized in that, said dispensing unit is the channel quality indication that is used for through the newly-increased 256QAM of support of following mode modulation system:
Use the channel quality indication of the modulation system of the said support of the one or more indications 256QAM in the existing channel quality indication index.
13. device as claimed in claim 12 is characterized in that, said dispensing unit is to be used for: use channel quality indication index 14 indicating modulation modes to be 256QAM, code check is 832/1024, and spectrum efficiency is 6.5000; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375;
Perhaps,
Channel quality indication index 13 indicating modulation modes are 256QAM, and code check is 791/1024, and spectrum efficiency is 6.1797; Channel quality indication index 14 indicating modulation modes are 256QAM, and code check is 872/1024, and spectrum efficiency is 6.8125; Channel quality indication index 15 indicating modulation modes are 256QAM, and code check is 952/1024, and spectrum efficiency is 7.4375.
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| RU2793835C2 (en) * | 2018-01-18 | 2023-04-07 | Хуавэй Текнолоджиз Ко., Лтд. | Method, terminal device, network device, chip and communication device for sending channel quality indicator (cqi) and modulation and coding scheme (mcs) |
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