CN104052569B - Method and device for switching MCS - Google Patents
Method and device for switching MCS Download PDFInfo
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- CN104052569B CN104052569B CN201310078252.1A CN201310078252A CN104052569B CN 104052569 B CN104052569 B CN 104052569B CN 201310078252 A CN201310078252 A CN 201310078252A CN 104052569 B CN104052569 B CN 104052569B
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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
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
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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
- H04L1/0002—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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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Abstract
The invention discloses a method and a device for switching MCS, wherein the method comprises the following steps: detecting whether MCS used for communication between a first communication node and a second communication node needs to be switched or not; and if so, performing the switching through a direct connection channel between the first communication node and the second communication node. The invention solves the technical problems of larger time delay and higher error rate caused by the MCS switching through the network management system in the related technology, and achieves the technical effects of reducing the MCS switching time delay and reducing the error rate.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for switching Modulation and Coding Scheme (MCS).
Background
Microwave communication, together with fiber optic communication and satellite communication, is known as the three main means of modern communications transmission. The microwave communication generally adopts a point-to-point transmission mode, is mainly applied to a 2G or 3G mobile carrier network at present, provides voice and data service transmission for mobile operators, and has the advantages of large transmission capacity, stable long-distance transmission quality, less investment, short construction period, convenient maintenance and the like. A typical network topology for applying microwave communication to a mobile carrier network is shown in fig. 1, and a point-to-point scenario may be used for backbone transmission between base stations and between a base station and a base station control station or an access gateway.
Generally, a microwave communication node is shown in fig. 2 and is composed of a modem unit and a radio frequency transceiver unit. Wherein, the modulation-demodulation unit includes: the baseband interface and modem Unit are also called indoor Unit (IDU) because they are usually located indoors. The radio frequency transceiving Unit mainly achieves a radio frequency transceiving function, and is generally placed on an iron tower together with an antenna, so that the radio frequency transceiving Unit is also called an outdoor Unit (Out-Door Unit, ODU for short).
With the development of mobile wireless network and ethernet technology, microwave transmission is gradually developed from traditional Time Division Multiplexing (TDM) service transmission to present-day mixed service transmission (for example, a mode of mixing various types of data such as time division Multiplexing, E1, ethernet, etc.), and transmission capacity is gradually increasing. Data from different interfaces are uniformly scheduled and encapsulated into data frames, then are modulated through a modulation and demodulation unit, and are sent out through a radio frequency unit. Because the transmission mode of microwave point-to-point wireless communication has high requirements on the environment, the modulation mode and the code rate need to be adjusted according to the influence of the environment to adapt to the current channel condition, and when the communication environment is good, the higher modulation mode is generally adopted, so that the throughput is higher; otherwise, a lower modulation mode is adopted.
At present, when MCS switching is required, the processing mode is as shown in fig. 3, and after a system is powered on, the transmitting and receiving ends of an a node and a B node both operate in a default Modulation Coding Scheme (MCS) and a code rate. Along with the change of environment, when the current modulation mode and code rate cannot meet the requirement of a channel, the receiving ends of the node a and the node B send an instruction for requiring the opposite end to switch the MCS to a local Central Processing Unit (CPU), the instruction is notified to the CPU of the opposite end through an upper network management system, and the switching instruction is sent to a local external bearer Unit and a Modem (modulation and demodulation Unit), and the external bearer Unit and the Modem of the source node, respectively, thereby ensuring that the system switches the corresponding MCS at the position of the same frame data.
However, when the above-described processing is performed, the following problems mainly occur:
1) sending the switching request to a CPU, and then uploading the switching request to an upper network management system, so that the switching delay is large, and generally the switching delay can reach 10ms to 20ms approximately;
2) it is difficult to ensure that the external receiving units and modems of the node a and the node B switch corresponding MCSs at the same frame data position, thereby causing error codes;
3) the cooperation of external network management is needed, and the code needed for realizing the cooperation is larger.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for switching MCS, which are used for at least solving the technical problems of larger time delay and higher error rate caused by MCS switching through a network management system in the prior art.
According to an aspect of the embodiments of the present invention, there is provided a method for switching MCS, comprising: detecting whether MCS used for communication between a first communication node and a second communication node needs to be switched or not; and if so, performing the switching through a direct connection channel between the first communication node and the second communication node.
Preferably, the performing the handover through the direct connection channel between the first communication node and the second communication node includes: when the first communication node determines that the handover is required, the first communication node transmits an MCS request message to the second communication node, wherein the MCS request message is used for notifying the second communication node to perform communication by using a new MCS in a predetermined frame.
Preferably, the MCS request message is carried in an MCS _ type field data frame.
Preferably, after the first communication node transmits the MCS request message to the second communication node, the method further includes: the second communication node receiving the MCS request message; the transmitting AMC control module of the second communication node, after detecting the frame header indication signal transmitted by the external receiving unit of the second communication node, notifies the MCS request message to the external receiving unit of the second communication node, and is configured to notify the external receiving unit of the second communication node to perform communication using the new MCS when receiving the M-1 th frame after the MCS request message, where M is a positive integer.
Preferably, after notifying the MCS request message to the external bearer unit of the second communication node, the method further includes: the modem unit of the second communication node and the external receiving unit of the second communication node perform communication using the new MCS when receiving the mth frame after the MCS request message from the second communication node.
Preferably, after notifying the MCS request message to the external bearer unit of the second communication node, the method further includes: the receiving AMC control module of the first communication node receives the MCS request message sent by the modem unit of the second communication node on the M-1 th frame after the second communication node receives the MCS request message, and notifies the first communication node of performing communication using the new MCS; the modem module of the first communication node starts to communicate with the new MCS when receiving the next frame after the MCS request message; the external receiving unit of the first communication node starts communication using the new MCS when receiving a frame header indication signal of a next frame after the second communication node receives the MCS request message.
Preferably, the detecting whether the MCS used for the communication between the first communication node and the second communication node needs to be switched includes: and determining that the handover is required between the first communication node and the second communication node when the Mean Square Error (MSE) is greater than a first predetermined threshold and/or the block error rate (BLER) is greater than a second predetermined threshold.
Preferably, the method is applied to a microwave communication system.
According to another aspect of the embodiments of the present invention, there is provided an apparatus for switching an MCS, located in a peer-to-peer communication node, including: the adaptive modulation coding AMC engine module is used for detecting whether an MCS used for communication with another communication node needs to be switched; and the transmitting end AMC control module is used for performing the switching through a direct connection channel between the transmitting end AMC control module and the other second communication node under the condition that the determination is yes.
Preferably, the transmitting-side AMC control module is further configured to send an MCS request message to the receiving-side AMC control module of the other communication node if yes, where the MCS request message is used to notify the other communication node to perform communication using a new MCS on a predetermined frame.
In the embodiment of the invention, in the peer-to-peer communication system, if the MCS adopted between two peer-to-peer communication nodes is detected to be incapable of meeting the requirements of the current system and a new MCS is required to be adopted for communication, the switching is carried out through a direct connection channel between the two peer-to-peer communication nodes, and the switching is not carried out through a third party network management system except the two peer-to-peer communication nodes, so that the technical problems of larger delay and higher error rate caused by the MCS switching through the network management system in the related technology are solved, and the technical effects of reducing the MCS switching delay and reducing the error rate are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic view of a microwave point-to-point transmission scenario according to the related art;
fig. 2 is a schematic diagram of the composition of a microwave transmission system according to the related art;
fig. 3 is a block diagram of a microwave adaptive modulation and coding process according to the related art;
FIG. 4 is a preferred flow chart of a method for switching MCS according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a modulation and coding frame structure of microwave adaptive modulation and coding according to an embodiment of the present invention;
FIG. 6 is a block diagram of a preferred structure of an apparatus for switching MCS according to an embodiment of the present invention;
fig. 7 is a block diagram of a preferred process of microwave adaptive modulation and coding according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The embodiment of the present invention provides a method for switching MCS preferably, as shown in fig. 4, the method includes the following steps:
step S402: detecting whether MCS used for communication between a first communication node and a second communication node needs to be switched or not;
step S404: in the event of a determination that it is, performing the handover over a direct channel between the first communication node and the second communication node.
In the above preferred embodiment, in the peer-to-peer communication system, if it is detected that the MCS used between the two peer-to-peer communication nodes cannot meet the current system requirement and a new MCS needs to be used for communication, the switching is performed through the direct connection channel between the two peer-to-peer communication nodes, and the switching is not performed through a third-party network management system other than the two peer-to-peer communication nodes, so that the technical problems of large delay and high error rate caused by MCS switching through the network management system in the related art are solved, and the technical effects of reducing MCS switching delay and reducing error rate are achieved.
In the step S402, it may be determined whether the switching of the MCS needs to be performed, and if a Mean Square Error (MSE) is greater than a first predetermined threshold and/or a Block Error rate (BLER) is greater than a second predetermined threshold, it may be determined that the switching needs to be performed between the first communication node and the second communication node. Preferably, the above-mentioned determination may be performed at the first communication node or the second communication node, and it is needless to say that which node determines which node triggers the above-mentioned handover procedure. In practical applications, there may be multiple MCSs, and then there should be two thresholds (the size of the thresholds can be configured by software) for each current MCS. Preferably, in order to ensure no code switching, the threshold may be selected with some margin, that is, the set threshold is a threshold interval, and when the threshold is greater than any value in the interval, the corresponding switching is performed.
In step S404, in order to enable the direct connection channel between the two communication nodes to perform the handover, a data frame transmitted between the two communication nodes may be used to carry a corresponding handover request message. In a preferred embodiment, the switching over the direct connection channel between the first communication node and the second communication node comprises: when the first communication node determines that the handover is required, the first communication node sends an MCS request message to the second communication node (that is, the first communication node triggers a subsequent handover procedure), where the MCS request message is used to notify the second communication node to use a new MCS for communication on a predetermined frame. For example, the MCS request message may be carried in an MCS _ type field data frame as shown in fig. 5, preferably, a segment of the data frame may be preset to carry the MCS request message, for example, the MCS request message may be carried in the upper bits of the MCS _ type field data frame.
In order to realize that the external receiving unit and the modem unit of the first communication node and the second communication node can switch to a new MCS for communication in the same frame, the synchronization between the two communication nodes can be realized by the following method: after the first communication node sends the MCS request message to the second communication node, the second communication node receives the MCS request message; however, the MCS request message is not immediately sent to the external bearer of the second communication node, but after the sending AMC control module of the second communication node detects the frame header indication signal (sync) sent by the external bearer of the second communication node, the sending AMC control module then notifies the external bearer of the second communication node of the MCS request message, and the external bearer of the second communication node is notified by the MCS request message to use a new MCS for communication when the second communication node receives the mth frame after the MCS request message, where M is a positive integer. That is, the two communication nodes configure the value M in advance, and then instruct the external bearer of the second communication node to start switching to the new MCS for communication in the M-1 th frame after receiving the request message. Preferably, M may be configured when the entire communication system is initially powered up. That is, the modem unit of the second communication node and the external receiving unit of the second communication node simultaneously communicate using the new MCS when receiving the mth frame after the MCS request message from the second communication node.
In a preferred embodiment, the modem unit of the second communication node sends an MCS request message to the receiving AMC control module of the first communication node from the M-1 th frame after receiving the MCS request message, so as to notify the first communication node to use a new MCS for communication; the modulation and demodulation module of the first communication node starts to adopt a new MCS for communication when receiving the next frame after the MCS request message; and the external receiving unit of the first communication node starts to adopt the new MCS for communication when receiving the frame header indication signal of the next frame.
Since the external receiving unit of the second communication node already starts sending the first frame when receiving the MCS request message (request MCS), the external receiving unit can only start counting from the head of the next frame, however, the modem starts counting from the current frame directly and simultaneously, and the mth frame counted by the modem is the previous frame of the mth frame counted by the external receiving unit, so that the modem unit of the first communication node, the external receiving unit of the first communication node, the modem unit of the second communication node, and the external receiving unit of the second communication node can switch MCS in the same frame.
In the above preferred embodiments, the above method can be applied, but not limited, to a microwave communication system.
In this embodiment, a device for switching an MCS is further provided, where the device is located in a peer-to-peer communication node, and the device is used to implement the foregoing embodiment and the preferred embodiment, and details of which have been already described are omitted. As used below, the term "unit" or "module" may implement a combination of software and/or hardware of predetermined functions. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 6 is a block diagram of a preferred structure of an apparatus for switching MCS according to an embodiment of the present invention, as shown in fig. 6, including: an Adaptive Modulation and Coding (AMC) engine module determination unit 602 and an originating AMC control module 604, the structure of which is described below.
An adaptive AMC engine module 602, configured to detect whether an MCS used for communicating with another communication node needs to be switched;
an originating AMC control module 604 coupled to the adaptive modulation and coding engine module 602, for performing the handover via a direct channel with the another second communication node if it is determined that the handover is performed.
In a preferred embodiment, the transmitting AMC control module 604 is further configured to send an MCS request message to the receiving AMC control module of the other communication node if yes, wherein the MCS request message is used to notify the other communication node to use a new MCS for communication on a predetermined frame.
The apparatus for switching MCS is located in a first communication node, and the receiving AMC control module is located in a second communication node, however, it should be noted that the first communication node and the second communication node are peer-to-peer communication nodes, and the first communication node and the second communication node have an adaptive AMC engine module, an originating AMC control module, and a receiving AMC control module at the same time.
The present invention is further explained below with reference to a specific preferred system switching architecture for adaptive coded modulation in peer-to-peer wireless communication systems, but it should be noted that the preferred embodiment is only for better describing the present invention and should not be construed as unduly limiting the present invention.
Through the following embodiments, the peer-to-peer wireless communication system can respond to the change of the wireless channel in real time in the real channel, and quickly adjust the Modulation Coding Scheme (MCS) without error so as to adapt to the current channel. The system switching structure of the self-adaptive coding modulation can support the switching of the modulation mode and the coding mode, the hardware implementation structure is simpler, only some corresponding judgment conditions need to be added, and the resource overhead is lower. The following describes the implementation process specifically, as shown in fig. 7:
s1: an Adaptive Modulation and Coding (AMC) engine module of a node B (which is equivalent to the first communication node) determines a change condition of a current link according to a Mean Square Error (MSE) and a Block Error rate (BLER) (preferably, the determination condition may be configured by software); when the value of MSE or BLER exceeds a predetermined threshold, it may be determined that switching to a corresponding MCS is required, and each current MCS corresponds to two predetermined threshold values (the threshold values may be configured by software). Preferably, in order to ensure no code switching, the threshold may be selected with some margin, that is, the set threshold is a threshold interval, and when the threshold is greater than any value in the interval, the corresponding switching is performed.
S2: informing, by an AMC engine module of the node B, that a sending AMC control module of the node carries a corresponding MCS request message (request MCS message) in a next frame, and preferably, inserting the request MCS message into a high bit of an MCS _ tpye field in a frame format as shown in fig. 5 for sending;
s3: a sending AMC control module of a node B sends a data frame carrying a corresponding request mcs message;
s4: when a receiving AMC control module of the node A (equivalent to the second communication node) receives a request mcs message, the receiving AMC control module notifies the sending AMC control module of the node A of the request mcs message;
s5: when a sending AMC control module of an a node detects a frame header indication signal (sync) sent by an external bearer unit of the a node, it notifies the external bearer unit of the a node of a received request MCS, for the external bearer unit of the a node, the request MCS indicates an MCS that should be adopted on a pre _ node number frame, and the number of frames pre-notified by the pre _ node number (equivalent to the above M) may be configured by software at power-on initial time;
s6: when detecting that the current request MCS is different from the last received request MCS, starting a counter, switching the external receiving unit to a new MCS when counting a pre _ notification number frame, sending a request MCS message to the B node by the modem in a lower bit of an MCS type (MCS _ tpye) field in the frame format shown in fig. 5 when counting the pre _ notification number frame, and starting counting by the modem at the same time because sync is an indication signal of a frame header, the external receiving unit already starts sending a first frame when receiving the request MCS, so that the external receiving unit can only start counting from a next frame, and the modem starts counting at the same time, so that the pre _ notification number frame counted by the modem is a previous frame of the pre _ notification number frame counted by the external receiving unit. The sending of the pre-notification frame ensures that the fast switching is reduced by several frames compared with the traditional implementation mode, namely, the time of 4-8 milliseconds is reduced;
s7: after parsing the request MCS message, the receiving AMC control module of the node B notifies the external receiving unit of the node B to switch to a new MCS in the next frame, and starts to start the new MCS when the external receiving unit receives the frame header signal, thereby ensuring synchronous switching with the modem.
The transmitting end of the external receiving unit is informed of the MCS in advance in the above steps S5 and S6, and both sides switch the corresponding MCS at the position of the pre _ noticenber designated frame, thereby ensuring no error code generation during the switching process. If pre _ notticimber is configured to be 1, then when the transmitting AMC control module detects a frame header indication signal (sync) transmitted by the external receiving unit and immediately notifies the received request MCS to the external receiving unit, the external receiving unit can quickly complete the switching of the MCS, the maximum delay of the whole process is only 4ms, and since the change of the channel is a gradual process, the change of the channel can be followed by the delay of 8 ms. The MCS pre-notification to the receiving end of the external bearer is completed in step S7, and the receiving end is requested to receive the switched data at the fastest speed. By adopting the switching mode, the system is ensured to be switched without error codes, the speed of responding the current channel change is higher, the switching delay is smaller, and meanwhile, the code required by hardware implementation is smaller.
In the preferred embodiment described above, the channel adjustment information is fed back by the node B for MCS adjustment of the a-to-B unidirectional link, since a and B are peer nodes, the same is true for the a node to feed back the channel adjustment information. Meanwhile, the two are respectively adjusted without influencing each other.
In another embodiment, a software is provided, which is used to execute the technical solutions described in the above embodiments and preferred embodiments.
In another embodiment, a storage medium is provided, in which the software is stored, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
From the above description, it can be seen that the present invention achieves the following technical effects: in a peer-to-peer communication system, if it is detected that an MCS adopted between two peer communication nodes cannot meet the requirements of the current system and a new MCS is required to be adopted for communication, switching is performed through a direct connection channel between the two peer communication nodes instead of switching through a third-party network management system except the two peer communication nodes, so that the technical problems of large delay and high error rate caused by MCS switching through the network management system in the related art are solved, and the technical effects of reducing MCS switching delay and reducing the error rate are achieved.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for switching Modulation Coding Scheme (MCS) is applied to a microwave communication system, and is characterized by comprising the following steps:
detecting whether MCS used for communication between a first communication node and a second communication node needs to be switched or not;
in the event of a determination that the determination is positive, performing the handover over a direct channel between the first communication node and the second communication node;
wherein the switching over the direct connection channel between the first communication node and the second communication node comprises: under the condition that the first communication node determines that the switching is needed, the first communication node sends an MCS request message to the second communication node, wherein the MCS request message is used for informing the second communication node to adopt a new MCS for communication on a preset frame;
after the first communication node sends the MCS request message to the second communication node, the method further comprises: the second communication node receiving the MCS request message; and after detecting a frame header indication signal sent by an external receiving unit of the second communication node, a sending AMC control module of the second communication node notifies the external receiving unit of the second communication node of the MCS request message, and is configured to notify the external receiving unit of the second communication node to use the new MCS for communication when receiving an M-1 th frame after the MCS request message, where M is a positive integer.
2. The method of claim 1, wherein the MCS request message is carried in an MCS _ type field data frame.
3. The method of claim 1, wherein after notifying the MCS request message to an external donor element of the second communication node, the method further comprises:
and the modulation and demodulation unit of the second communication node and the external receiving unit of the second communication node adopt the new MCS for communication when receiving the Mth frame after the MCS request message from the second communication node.
4. The method of claim 1, wherein after notifying the MCS request message to an external donor element of the second communication node, the method further comprises:
the receiving AMC control module of the first communication node receives the MCS request message sent by the modulation and demodulation unit of the second communication node on the M-1 th frame after the second communication node receives the MCS request message, and is used for informing the first communication node to adopt the new MCS for communication;
the modulation and demodulation module of the first communication node starts to adopt the new MCS for communication when receiving the next frame after the MCS request message;
and the external receiving unit of the first communication node starts to adopt the new MCS for communication when receiving a frame header indication signal of a next frame after the second communication node receives the MCS request message.
5. The method of any of claims 1-4, wherein detecting whether the MCS used for communication between the first communication node and the second communication node requires a handover comprises:
and determining that the switching between the first communication node and the second communication node is required under the condition that the Mean Square Error (MSE) is larger than a first preset threshold value and/or the block error rate (BLER) is larger than a second preset threshold value.
6. A device for switching Modulation Coding Scheme (MCS) is applied to a microwave communication system, and is characterized in that the device is located in a peer-to-peer communication node and comprises:
the adaptive modulation coding AMC engine module is used for detecting whether an MCS used for communication with another communication node needs to be switched;
a transmitting end AMC control module for performing the switching through a direct channel with the other second communication node if yes is determined;
wherein the transmitting AMC control module is further configured to send an MCS request message to a receiving AMC control module of the other communication node if yes, wherein the MCS request message is used to inform the other communication node to use a new MCS for communication on a predetermined frame;
wherein the other communication node is configured to receive the MCS request message; the other communication node comprises a sending AMC control module and an external receiving unit, wherein the sending AMC control module is used for notifying the external receiving unit of the MCS request message after detecting a frame header indication signal sent by the external receiving unit so as to notify the external receiving unit to adopt the new MCS for communication when receiving an M-1 frame after the MCS request message, wherein M is a positive integer.
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| CN201310078252.1A CN104052569B (en) | 2013-03-12 | 2013-03-12 | Method and device for switching MCS |
| PCT/CN2013/090511 WO2014139307A1 (en) | 2013-03-12 | 2013-12-26 | Method and apparatus for mcs switching |
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| CN109150761B (en) * | 2018-10-24 | 2022-03-22 | 新华三技术有限公司 | Tunnel switching method and device |
| CN109495129B (en) * | 2018-12-28 | 2020-11-03 | 四川安迪科技实业有限公司 | Spread spectrum multiple lossless switching method based on satellite communication |
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| US20110305209A1 (en) * | 2010-03-09 | 2011-12-15 | Qualcomm Incorporated | Rate adaptation for sdma |
| CN102546086B (en) * | 2010-12-31 | 2015-05-20 | 中兴通讯股份有限公司 | Microwave communication data transmission method and microwave communication node |
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| CN101621352A (en) * | 2008-07-04 | 2010-01-06 | 大唐移动通信设备有限公司 | Antenna mode self-adaptive switching method, system and device |
| CN101938321A (en) * | 2009-06-30 | 2011-01-05 | 中国移动通信集团公司 | Method, device and system for determining modulation coding style |
| CN102468920A (en) * | 2010-11-01 | 2012-05-23 | 华为技术有限公司 | Method, device and system for self-adaption code modulation |
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