CN111130699B - Ad hoc network system and modulation mode determination method thereof - Google Patents
Ad hoc network system and modulation mode determination method thereof Download PDFInfo
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- CN111130699B CN111130699B CN201911378731.9A CN201911378731A CN111130699B CN 111130699 B CN111130699 B CN 111130699B CN 201911378731 A CN201911378731 A CN 201911378731A CN 111130699 B CN111130699 B CN 111130699B
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- 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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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
A modulation mode determination method of an ad hoc network system and the ad hoc network system are provided, the method comprises: the PAN coordinator determines the parameter value of a preset parameter, wherein the preset parameter is used for indicating the quality of the channel environment; the PAN coordinator determines modulation coding levels according to the parameter values, wherein the parameter values of the preset parameters have preset corresponding relations with the modulation coding levels; the PAN coordinator sends the indication information of the modulation coding level to a sending node; and the transmitting node determines a modulation mode according to the modulation coding grade. The scheme of the invention has the opportunity of improving the throughput of the self-organizing network and improving the network transmission efficiency.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an ad hoc network system, a modulation method thereof, and an ad hoc network system.
Background
In a Zigbee (Zigbee) system based on an 802.15.4 protocol of the Institute of Electrical and Electronics Engineers (IEEE), fixed carriers are used to transmit information, and each node uses the same carrier to transmit, which often causes interference and results in low transmission efficiency.
Taking the Zigbee system as an example, the physical layer of the Zigbee system has three different frequency bands, namely 868MHz frequency band in europe, 915MHz frequency band in north america, and 2.4GHz frequency band in global exemption, and 27 mutually independent channels are shared in the three frequency bands according to the Zigbee protocol standard, and the channel numbers are from 0 to 26.
However, in the existing ad hoc network system represented by Zigbee, a fixed modulation scheme, such as a QPSK modulation scheme, is adopted, which results in low network transmission efficiency.
A method for determining a modulation scheme of an ad hoc network system is needed to improve throughput of the ad hoc network and improve network transmission efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an ad hoc network system, a modulation mode determination method thereof and the ad hoc network system, so that the throughput of the ad hoc network can be improved and the network transmission efficiency can be improved.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a method for determining a modulation scheme of an ad hoc network system, where the ad hoc network system includes a PAN coordinator, a sending node, and a target node; the determination method comprises the following steps: the PAN coordinator determines parameter values of preset parameters, wherein the preset parameters are used for indicating the quality of a channel environment; the PAN coordinator determines modulation coding levels according to the parameter values, wherein the parameter values of the preset parameters have preset corresponding relations with the modulation coding levels; the PAN coordinator sends the indication information of the modulation coding level to a sending node; and the transmitting node determines a modulation mode according to the modulation coding grade.
Optionally, the sending, by the PAN coordinator, the indication information of the modulation and coding level to the sending node includes: the indication information of the modulation coding level is recorded in a beacon frame and adopted
A bit representation; wherein N is used to indicate the total number of modulation coding classes.
Optionally, the modulation mode is multiple, and each modulation mode has a modulation order; the step of determining, by the sending node, a modulation scheme according to the modulation coding level includes: if the modulation coding grade is higher, the modulation order of the modulation mode determined by the sending node is higher; and the modulation coding grade and the modulation order have one-to-one correspondence.
Optionally, the correspondence between the modulation coding level and the modulation order is predefined or configured by the PAN coordinator.
Optionally, if the modulation coding level is lower than or equal to a first preset level, the sending node determines that the modulation order of the modulation mode is 2 orders; if the modulation coding grade is between the first preset grade and the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 4 orders; and if the modulation coding grade is higher than or equal to the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 6 orders.
Optionally, the modulation modes corresponding to different modulation orders are selected from one or more of the following: the modulation order is 2 orders, and the corresponding modulation mode is QPSK; the modulation order is 4 orders, and the corresponding modulation mode is 16QAM; the modulation order is 6 orders, and the corresponding modulation mode is 64QAM.
Optionally, the method for determining a modulation scheme of an ad hoc network system further includes: the sending node determines the size of a transmission block according to the modulation coding grade; the transmitting node transmits data to a target node by adopting the transmission block and the modulation mode; wherein the higher the modulation coding level, the larger the transport block.
Optionally, the determining, by the sending node, the size of the transport block according to the modulation and coding level includes: the transmitting node determines N RU Said N is RU Determining according to the number of carriers and the number of frames; the transmitting node according to the modulation coding level and the N RU Searching a preset TBS table to determine the size of the transmission block; wherein the TBS table is used to indicate { modulation coding level, N RU And mapping relation between the size of the transmission block and the size of the transmission block.
Optionally, the TBS table is predefined or configured by the PAN coordinator.
Optionally, the preset parameters are selected from: signal strength and signal-to-noise ratio.
To solve the foregoing technical problem, an embodiment of the present invention provides an ad hoc network system, including: the system comprises a PAN coordinator, a sending node and a target node, wherein the PAN coordinator is used for determining parameter values of preset parameters, determining modulation coding levels according to the parameter values and sending indication information of the modulation coding levels to the sending node, the preset parameters are used for indicating the quality of a channel environment, and the parameter values of the preset parameters and a plurality of modulation coding levels have preset corresponding relations; and the transmitting node is used for determining a modulation mode according to the modulation coding grade.
Optionally, the indication information of the modulation coding level is recorded in a beacon frame and used
A bit representation; wherein N is used to indicate the total number of modulation coding classes.
Optionally, the modulation modes are multiple, and each modulation mode has a modulation order; when the modulation coding grade is higher, the modulation order of the modulation mode determined by the sending node is higher; and the modulation coding grade and the modulation order have one-to-one correspondence.
Optionally, the correspondence between the modulation coding level and the modulation order is predefined or configured by the PAN coordinator.
Optionally, when the modulation coding level is lower than or equal to a first preset level, the sending node determines that the modulation order of the modulation mode is 2 orders; when the modulation coding grade is between the first preset grade and the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 4 orders; and when the modulation coding grade is higher than or equal to the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 6 orders.
Optionally, the modulation modes corresponding to different modulation orders are selected from one or more of the following: the modulation order is 2 orders, and the corresponding modulation mode is QPSK; the modulation order is 4 orders, and the corresponding modulation mode is 16QAM; the modulation order is 6 orders, and the corresponding modulation mode is 64QAM.
Optionally, the sending node further determines the size of a transmission block according to the modulation coding level, and transmits data to the target node by using the transmission block and the modulation mode; wherein the higher the modulation coding level, the larger the transport block.
Optionally, the sending node is configured to determine N RU And according to said modulation coding level and said N RU Searching a preset TBS table to determine the size of the transmission block; wherein, the N is RU Determining according to the number of carriers and the number of frames; the TBS table is used to indicate { modulation coding level, N RU And mapping relation between the size of the transmission block and the size of the transmission block.
Optionally, the TBS table is predefined or configured by the PAN coordinator.
Optionally, the preset parameters are selected from: signal strength and signal-to-noise ratio.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, a PAN coordinator determines the parameter value of a preset parameter, wherein the preset parameter is used for indicating the quality of a channel environment; the PAN coordinator determines modulation coding levels according to the parameter values, wherein the parameter values of the preset parameters have preset corresponding relations with the modulation coding levels; the PAN coordinator sends the indication information of the modulation coding level to a sending node; and the transmitting node determines a modulation mode according to the modulation coding grade. By adopting the scheme, the PAN coordinator is arranged to determine the modulation coding level according to the parameter value, and the sending node determines the modulation mode according to the modulation coding level, so that the modulation mode is determined according to the quality of the channel environment, and higher data rate is transmitted.
Further, in the embodiment of the present invention, by setting the higher the modulation coding level is, the higher the modulation order of the modulation scheme determined by the sending node is, and when the channel environment is better, the throughput of the ad hoc network can be further improved and the network transmission efficiency can be improved by adopting the higher-order modulation scheme.
Further, in the embodiment of the present invention, by setting that the higher the modulation coding level is, the larger the transmission block is, the size of the transmission block is determined by the sending node according to the modulation coding level, and when the channel environment is better, the throughput of the ad hoc network is improved and the network transmission efficiency is improved by using the larger transmission block.
Drawings
Fig. 1 is a flowchart of a modulation scheme determining method of an ad hoc network system according to an embodiment of the present invention;
fig. 2 is a schematic networking diagram of an ad hoc network system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a partial frame structure of a beacon frame according to an embodiment of the present invention;
fig. 4 is a partial flowchart of a modulation scheme determining method of another ad hoc network system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of BPSK modulation in an embodiment of the invention;
FIG. 6 is a diagram of an O-QPSK modulation in an embodiment of the invention;
FIG. 7 is a diagram illustrating O-QPSK shifting in accordance with an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an ad hoc network system according to an embodiment of the present invention.
Detailed Description
As described above, in the existing ad hoc network system represented by Zigbee, a fixed modulation method is adopted, which results in low network transmission efficiency.
The inventor of the present invention has found through research that in the prior art, a fixed modulation mode is adopted, and the situation of mismatching with the channel quality often occurs. In particular, under the condition of good channel environment, higher data rate cannot be transmitted often; under the condition of poor channel environment, data cannot be transmitted correctly, and the network transmission efficiency is greatly influenced.
In the embodiment of the invention, a PAN coordinator determines the parameter value of a preset parameter, wherein the preset parameter is used for indicating the quality of the channel environment; the PAN coordinator determines modulation coding levels according to the parameter values, wherein the parameter values of the preset parameters have preset corresponding relations with the modulation coding levels; the PAN coordinator sends the indication information of the modulation coding level to a sending node; and the transmitting node determines a modulation mode according to the modulation coding grade. By adopting the scheme, the PAN coordinator is arranged to determine the modulation coding level according to the parameter value, and the sending node determines the modulation mode according to the modulation coding level, so that the modulation mode is determined according to the quality of the channel environment, and higher data rate is transmitted.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, fig. 1 is a flowchart of a modulation scheme determining method of an ad hoc network system in an embodiment of the present invention. The method for determining the modulation mode of the ad hoc network system may include steps S11 to S14:
step S11: the PAN coordinator determines parameter values of preset parameters, wherein the preset parameters are used for indicating the quality of a channel environment;
step S12: the PAN coordinator determines modulation coding levels according to the parameter values, wherein the parameter values of the preset parameters have preset corresponding relations with the modulation coding levels;
step S13: the PAN coordinator sends the indication information of the modulation coding level to a sending node;
step S14: and the transmitting node determines a modulation mode according to the modulation coding grade.
And the modulation mode is used for transmitting data to the target node.
In a specific implementation of step S11, the ad hoc network system may include a PAN coordinator, a sending node, and a target node.
The ad hoc Network system may include a Personal Area Network (PAN) coordinator and one or more nodes, wherein a node initiating a transmission may be referred to as a sending node and a node finally reached may be referred to as a destination node.
Specifically, the nodes may be divided into relay nodes and terminal nodes, which may also be referred to as coordinator sub-nodes, and may be divided into 1 to N layers according to a field strength relationship with the PAN coordinator or nodes in adjacent layers thereof by using a hierarchical structure, where a maximum value of N may be 8. The PAN coordinator can be used for taking charge of field intensity collection and routing management of neighbor nodes of all nodes in the whole network, providing a routing query function for sub-nodes of the PAN coordinator, taking charge of management of wireless resources in the ad hoc network and the like.
Referring to fig. 2, fig. 2 is a schematic diagram of an ad hoc network system according to an embodiment of the present invention.
As shown in fig. 2, the ad hoc Network system may include a Personal Area Network (PAN) coordinator for maintaining neighbor routing information of all nodes in the ad hoc Network system; and each relay node can directly or indirectly communicate with the PAN coordinator through other relay nodes to acquire the neighbor routing information, and is provided with one or more terminal nodes, the terminal nodes belonging to the same relay node communicate through the same relay node, and the terminal nodes belonging to different relay nodes communicate through the different relay nodes.
Specifically, the terminal node and the PAN coordinator communicate by establishing a direct connection or an indirect connection; the indirect connection comprises connecting one or more of the relay nodes between the terminal node and the PAN coordinator. Specifically, the relay nodes may include a primary relay node directly connected to the PAN coordinator, a secondary relay node … connected to the primary relay node, and an n-level relay node connected to the n-1 level relay node, where the terminal node may be directly connected to the PAN coordinator, or may be connected to the primary relay node or any other level relay node as needed.
The relay node may communicate with the PAN coordinator and the terminal node in a time division, frequency division, or random access manner.
In the ad hoc network system according to the embodiment of the present invention, the relay node and the terminal node may also be referred to as coordinator sub-nodes, and may adopt a hierarchical structure, and are divided into 1 to N layers according to a field strength relationship with a PAN coordinator or nodes in adjacent layers thereof, where a maximum value of N may be 8. The PAN coordinator can be used for being responsible for collecting the field intensity of the neighbor nodes of all nodes of the whole network and managing the routing, providing a routing query function for the child nodes of the PAN coordinator, and being responsible for managing the wireless resources in the ad hoc network.
It should be noted that the ad hoc network system involved in the embodiment of the present invention is not limited to the ad hoc network system shown in fig. 2, and the data transmission method of the ad hoc network system may also be applied to other suitable ad hoc network systems.
Further, the PAN coordinator determines a parameter value of a preset parameter, wherein the preset parameter may be selected from: signal strength and signal-to-noise ratio.
The Signal Strength may be a Received Signal Strength Indicator (RSSI) parameter, which is used to determine channel quality and whether to increase broadcast transmission Strength.
It can be understood that the higher the signal strength is, the better the channel quality is, i.e. the better the channel environment is.
The Signal-to-noise Ratio (SNR or S/N), also called Signal-to-noise Ratio, is used to indicate the Ratio of Signal to noise in an electronic device or system.
It can be understood that the higher the signal-to-noise ratio, the better the channel quality, i.e. the better the channel environment.
With continued reference to fig. 1, in a specific implementation of step S12, the PAN coordinator may determine a modulation and coding level according to the parameter value, where the parameter value of the preset parameter has a preset corresponding relationship with multiple modulation and coding levels.
In a specific implementation, a parameter threshold of a plurality of preset parameters may be set, such as a first parameter threshold, a second parameter threshold, a third parameter threshold, and the like, and further, when a parameter value of the preset parameter is smaller than the first parameter threshold, the modulation and coding level is set as a first level; when the parameter value of the preset parameter is greater than or equal to a first parameter threshold value and smaller than a second parameter threshold value, setting the modulation coding level as a second level; when the parameter value of the preset parameter is greater than or equal to a second parameter threshold value and smaller than a third parameter threshold value, setting the modulation coding level as a third level; subsequent level settings and so on.
It should be noted that, adjacent parameter thresholds may be set to be equal differences, and may also be set to have different differences according to specific situations, which is not limited in this embodiment of the present invention.
In one embodiment, 15 parameter thresholds may be set to determine the number of modulation coding levels to be 16 levels.
In a specific implementation of step S13, the PAN coordinator sends indication information of the modulation and coding level to a sending node, where the indication information is used to indicate the modulation and coding level.
Further, the information indicative of the modulation and coding level may be recorded in a beacon frame and used
A bit representation; wherein N is used to indicate the total number of modulation coding classes.
Specifically, taking the number of modulation and coding levels N =16 levels as an example, the indication information may be adopted
The bits represent, for example, from 0000 to 1111.
Referring to fig. 3, fig. 3 is a schematic diagram of a partial frame structure of a beacon frame in an embodiment of the present invention.
The beacon frame may include indication information of a modulation and coding level (MCS sub-field) and other sub-fields.
Specifically, the indication information of the modulation and coding level may be indicated by using 4 bits. In one embodiment shown in fig. 3, 4-bit indications bit 17-bit 14 may be used.
It should be noted that the indication information of the Modulation and Coding Scheme level may also adopt a Modulation and Coding Scheme (MCS) index value I mcs And (4) showing.
Referring to Table 1, the MCS numbers (I) are shown in Table 1 mcs ) And (4) a table.
As shown in Table 1, I mcs Can adopt
A bit representation, e.g. I mcs From 0 to 15, represented by 0000 to 1111.
In a specific implementation of step S14, after receiving the indication information of the modulation and coding level, the sending node may determine a modulation scheme according to the modulation and coding level.
Specifically, the modulation scheme may be multiple, and each modulation scheme has a modulation order. The Modulation order is used to calculate the number of bits that each symbol (symbol) of the code pattern can represent, for example, binary Phase Shift Keying (BPSK), quadrature Phase Shift Keying (QPSK), eight-Quadrature Amplitude Modulation (8-Quadrature Amplitude Modulation,8 QAM), 16-Quadrature Amplitude Modulation (16 QAM), 32-Quadrature Amplitude Modulation (32 QAM), 64-Quadrature Amplitude Modulation (64-Quadrature Amplitude Modulation,64 QAM) and other code patterns, and the number of bits or symbols (symbol) of the code pattern is log2 (2), log2 (4), log2 (8), log2 (16), BPSK, QPSK,8, 3264 and corresponding Modulation orders of the BPSK, QPSK, 18, and 64 are 1 QAM, log 2QAM, 3 QAM, 4QAM, and 6QAM, respectively.
Further, the step that the sending node determines the modulation mode according to the modulation and coding level may include: if the modulation coding grade is higher, the modulation order of the modulation mode determined by the sending node is higher; and the modulation coding grade and the modulation order have one-to-one correspondence.
In the embodiment of the present invention, by setting the higher the modulation coding level is, the higher the modulation order of the modulation scheme determined by the sending node is, and when the channel environment is better, the throughput of the ad hoc network can be further improved and the network transmission efficiency can be improved by adopting the higher-order modulation scheme.
Further, the correspondence between the modulation coding level and the modulation order may be predefined or configured by the PAN coordinator.
In the embodiment of the invention, the corresponding relation is set to be predefined, so that the accuracy of determining the corresponding relation can be improved, and the signaling overhead is reduced; by setting the correspondence to be obtained from the PAN coordinator, the flexibility of setting can be improved.
Further, in a specific embodiment, the following manner may be adopted, and the modulation order is set to be higher as the modulation coding level is higher: if the modulation coding grade is lower than or equal to a first preset grade, the transmitting node determines that the modulation order of the modulation mode is 2 orders; if the modulation coding grade is between the first preset grade and the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 4 orders; and if the modulation coding grade is higher than or equal to the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 6 orders.
Further, the modulation schemes corresponding to different modulation orders may be selected from one or more of: the modulation order is 2 orders, and the corresponding modulation mode can be QPSK; the modulation order is 4 orders, and the corresponding modulation mode can be 16QAM; the modulation order is 6 orders, and the corresponding modulation mode may be 64QAM.
Referring to table 2, table 2 is an example of a modulation and Transport Block Size (TBS) index table.
TABLE 2
As shown in table 2, when the number of modulation and coding classes is N =16 classes, for example, the I is mcs Can adopt
A bit representation, e.g. I mcs From 0 to 15, 0000 to 1111 are indicated.
Wherein, when the modulation coding level is from 1 st level to 4 th level (i.e. I) mcs = 3), the modulation order may be 2; when the modulation coding level is from 5th to 9 th (i.e. I) mcs = 8), the modulation order may be 4; when the modulation coding level is from 10 th to 16 th (i.e. I) mcs = 15), the modulation order may be 6.
In the embodiment of the invention, the modulation coding grades are set to be in one-to-one correspondence with the modulation orders, so that the throughput of the self-organizing network can be better improved and the network transmission efficiency can be improved by accurately adopting a higher-order modulation mode when the channel environment is better.
It is noted that in the modulation and TBS index table shown in table 2, the TBS index I is TBS May be compared with the MCS index I MCS Are identical, so that the TBS index I can be determined according to the bit value of the modulation coding level TBS Value of (d) and MCS index I MCS For example, the values of (a) and (b) are equal to each other.
In the embodiment of the invention, the PAN coordinator is arranged to determine the modulation coding level according to the parameter value, and the sending node determines the modulation mode according to the modulation coding level, so that the modulation mode is determined according to the quality of the channel environment, and higher data rate is transmitted.
Referring to fig. 4, fig. 4 is a partial flowchart of a modulation scheme determining method of another ad hoc network system in the embodiment of the present invention. The modulation scheme determining method of another ad hoc network system may include steps S11 to S14 shown in fig. 1, and may further include steps S41 to S42:
step S41: the sending node determines the size of a transmission block according to the modulation coding grade;
step S42: and the transmitting node transmits data to the target node by adopting the transmission block and the modulation mode.
Wherein the higher the modulation coding level, the larger the transport block.
In the implementation of step S41, the size of the Transport Block (Transport Block) may be determined by looking up a TBS table.
Referring to table 3, table 3 is a TBS table.
As described in table 3, the TBS table may be used to indicate { modulation coding level, N } RU And mapping relation between the size of the transmission block and the size of the transmission block. For each column of data, it can be determined that the higher the modulation coding level, i.e., the MCS index I MCS The larger the transport block.
Wherein, the N is RU Can be determined according to the number of carriers and the number of frames. It is noted that the determination of N is described RU The steps of (a) may be performed in a conventional manner,the embodiment of the present invention is not limited thereto.
Further, the step of the transmitting node determining the size of the transport block according to the modulation and coding level may include: the transmitting node determines N RU Said N is RU Determining according to the number of carriers and the number of frames; the transmitting node according to the modulation coding level and the N RU Searching a preset TBS table to determine the size of the transmission block; wherein the TBS table is used to indicate { modulation coding level, N RU And mapping relation between the size of the transmission block and the size of the transmission block.
In the embodiment of the invention, the higher the modulation coding level is, the larger the transmission block is, and the sending node determines the size of the transmission block according to the modulation coding level, so that when the channel environment is better, the throughput of the self-organizing network is improved and the network transmission efficiency is improved by adopting the larger transmission block.
Further, the TBS table may be predefined or configured by the PAN coordinator.
In the embodiment of the invention, the TBS table is set to be predefined, so that the accuracy of determining the TBS table can be improved, and the signaling overhead is reduced; by setting the TBS table to be obtained from the PAN coordinator, the flexibility of setting the TBS table can be improved.
It should be noted that The technical solution of The present invention is applicable to The fifth generation mobile communication technology (5G) communication system, and is also applicable to 4G and 3G communication systems, and is also applicable to future new various communication systems, such as 6G and 7G.
It should be noted that, based on the physical layer of the 802.15.4 protocol, three carrier frequency bands are defined for transceiving data, specifically as shown in table 4, where table 4 is a related parameter for transceiving a data carrier frequency band.
TABLE 4
| Frequency (MHZ) | Modulation system | Transmission rate |
| 868 | BPSK | 20KBPS |
| 915 | BPSK | 40KBPS |
| 2450 | Q-QPSK | 250KBPS |
Referring to fig. 5, fig. 5 is a schematic diagram of BPSK modulation according to an embodiment of the present invention.
Specifically, BPSK modulation is performed after differential encoding and symbol-chip sequence mapping.
Referring to fig. 6, fig. 6 is a diagram illustrating an O-QPSK modulation according to an embodiment of the present invention.
Wherein the bit-to-symbol mapping is used to indicate that every four bits (b 0, b1, b2, b 3) are mapped to one symbol, b0 being the highest bit.
The symbol-chip sequence mapping is used to indicate that 32chip PN sequences are used for mapping at 2450MHz and 2380MHz frequency bands.
Referring to fig. 7, fig. 7 is a diagram illustrating O-QPSK offset according to an embodiment of the present invention.
As shown in fig. 7, the Chip sequence is modulated on the carrier frequency according to O-QPSK and root raised cosine filtered. Tc is the inverse of the chip rate.
In the frequency bands of 240MHz, 915MHz,868MHz and 2380MHz, the following formulas are adopted:
it should be noted that, in a specific implementation manner of the embodiment of the present invention, only a fixed BPSK or QPSK modulation scheme may be used in the determined frequency band.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an ad hoc network system in an embodiment of the present invention. The ad hoc network system may include: PAN coordinator 81, sending node 82, and target node 83.
The PAN coordinator 81 may be configured to determine a parameter value of a preset parameter, determine a modulation coding level according to the parameter value, and send indication information of the modulation coding level to a sending node, where the preset parameter is used to indicate whether a channel environment is good or bad, and the parameter value of the preset parameter has a preset corresponding relationship with multiple modulation coding levels; the transmitting node 82 may be configured to determine a modulation scheme according to the modulation and coding level.
Further, the information indicative of the modulation and coding level may be recorded in a beacon frame and used
A bit representation; wherein N is used to indicate the total number of modulation coding classes.
Further, the modulation modes may be multiple, and each modulation mode may have a modulation order; when the modulation coding level is higher, the modulation order of the modulation mode determined by the sending node may be higher; and the modulation coding grade and the modulation order have one-to-one correspondence.
Further, the correspondence between the modulation coding level and the modulation order may be predefined or configured by the PAN coordinator.
Further, when the modulation coding level is lower than or equal to a first preset level, the transmitting node determines that the modulation order of the modulation mode can be 2 orders; when the modulation coding level is between the first preset level and the second preset level, the transmitting node determines that the modulation order of the modulation mode can be 4 orders; when the modulation coding level is higher than or equal to the second preset level, the transmitting node determines that the modulation order of the modulation mode can be 6 orders.
Further, the modulation modes corresponding to different modulation orders may be selected from one or more of the following: the modulation order is 2 orders, and the corresponding modulation mode is QPSK; the modulation order is 4 orders, and the corresponding modulation mode is 16QAM; the modulation order is 6 orders, and the corresponding modulation mode is 64QAM.
Further, the sending node may also determine the size of a transport block according to the modulation coding level, and transmit data to a target node by using the transport block and the modulation scheme; wherein the higher the modulation coding level, the larger the transport block.
Further, the transmitting node may be configured to determine N RU And according to said modulation coding level and said N RU Searching a preset TBS table to determine the size of the transmission block; wherein, the N is RU Determining according to the number of carriers and the number of frames; the TBS table is used to indicate { modulation coding level, N RU -mapping relation with the size of the transport block.
Further, the TBS table may be predefined or configured by the PAN coordinator.
Further, the preset parameters may be selected from: signal strength and signal-to-noise ratio.
For the principle, specific implementation and beneficial effects of the ad hoc network system, please refer to the foregoing and the related descriptions about the modulation mode determining method of the ad hoc network system shown in fig. 1 to fig. 7, which are not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (20)
1. A method for determining modulation mode of ad hoc network system is characterized in that,
the ad hoc network system comprises a PAN coordinator, a sending node and a target node;
the determination method comprises the following steps:
the PAN coordinator determines parameter values of preset parameters, wherein the preset parameters are used for indicating the quality of a channel environment;
the PAN coordinator determines modulation coding levels according to the parameter values, wherein the parameter values of the preset parameters have preset corresponding relations with the modulation coding levels;
the PAN coordinator sends the indication information of the modulation coding level to a sending node;
the transmitting node determines a modulation mode according to the modulation coding grade;
the method further comprises the following steps: the transmitting node transmits data to the target node by adopting the modulation mode;
the higher the modulation coding level is, the higher the modulation order of the modulation scheme determined by the sending node is, and/or the higher the modulation coding level is, the larger the transmission block used for transmitting data is.
2. The method of claim 1, wherein the sending, by the PAN coordinator to the sending node, the information indicating the modulation and coding level comprises:
the indication information of the modulation coding level is recorded in a beacon frame and adopted
A bit representation;
wherein N is used to indicate the total number of modulation coding classes.
3. The method for determining the modulation scheme of the ad hoc network system according to claim 1, wherein the modulation scheme is multiple, and each modulation scheme has a modulation order;
and the modulation coding grade and the modulation order have one-to-one correspondence.
4. The method as claimed in claim 3, wherein the correspondence between the modulation coding level and the modulation order is predefined or configured by the PAN coordinator.
5. The method according to claim 3, wherein the modulation scheme of the ad-hoc network system is determined,
if the modulation coding grade is lower than or equal to a first preset grade, the transmitting node determines that the modulation order of the modulation mode is 2 orders;
if the modulation coding grade is between the first preset grade and the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 4 orders;
and if the modulation coding grade is higher than or equal to the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 6 orders.
6. The method according to claim 5, wherein the modulation schemes corresponding to different modulation orders are selected from one or more of the following:
the modulation order is 2 orders, and the corresponding modulation mode is QPSK;
the modulation order is 4 orders, and the corresponding modulation mode is 16QAM;
the modulation order is 6 orders, and the corresponding modulation mode is 64QAM.
7. The method for determining the modulation scheme of the ad hoc network system according to claim 1, further comprising:
the sending node determines the size of a transmission block according to the modulation coding grade;
and the transmitting node transmits data to the target node by adopting the transmission block.
8. The method for determining the modulation scheme of an ad hoc network system according to claim 7,
the determining, by the sending node, the size of the transport block according to the modulation coding class includes:
the transmitting node determines N RU Said N is RU Determining according to the number of carriers and the number of frames;
the transmitting node according to the modulation coding level and the N RU Searching a preset TBS table to determine the size of the transmission block;
wherein the TBS table is used to indicate { modulation coding level, N RU And mapping relation between the size of the transmission block and the size of the transmission block.
9. The method of claim 8, wherein the TBS table is predefined or configured by the PAN coordinator.
10. The method for determining the modulation scheme of the ad hoc network system according to claim 1, wherein the preset parameter is selected from the group consisting of: signal strength and signal-to-noise ratio.
11. An ad hoc network system, comprising: a PAN coordinator, a sending node, and a target node, wherein,
the PAN coordinator is used for determining parameter values of preset parameters, determining modulation coding levels according to the parameter values, and sending indication information of the modulation coding levels to a sending node, wherein the preset parameters are used for indicating the quality of a channel environment, and the parameter values of the preset parameters have preset corresponding relations with a plurality of modulation coding levels;
the transmitting node is used for determining a modulation mode according to the modulation coding grade and transmitting data to the target node by adopting the modulation mode;
the higher the modulation coding level is, the higher the modulation order of the modulation scheme determined by the sending node is, and/or the higher the modulation coding level is, the larger the transmission block used for transmitting data is.
12. The ad-hoc network system according to claim 11,
the indication information of the modulation coding level is recorded in a beacon frame and adopted
A bit representation;
wherein N is used to indicate the total number of modulation coding classes.
13. The ad hoc network system according to claim 11, wherein the modulation scheme is plural, each modulation scheme having a modulation order;
and the modulation coding grade and the modulation order have one-to-one correspondence.
14. The ad-hoc network system according to claim 13,
the correspondence between the modulation coding level and the modulation order is predefined or configured by the PAN coordinator.
15. The ad-hoc network system according to claim 13,
when the modulation coding grade is lower than or equal to a first preset grade, the transmitting node determines that the modulation order of the modulation mode is 2 orders;
when the modulation coding grade is between the first preset grade and the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 4 orders;
and when the modulation coding grade is higher than or equal to the second preset grade, the transmitting node determines that the modulation order of the modulation mode is 6 orders.
16. The ad-hoc network system of claim 15, wherein the modulation schemes corresponding to different modulation orders are selected from one or more of:
the modulation order is 2 orders, and the corresponding modulation mode is QPSK;
the modulation order is 4 orders, and the corresponding modulation mode is 16QAM;
the modulation order is 6 orders, and the corresponding modulation mode is 64QAM.
17. The ad-hoc network system according to claim 11,
and the sending node also determines the size of a transmission block according to the modulation coding grade and transmits data to a target node by adopting the transmission block and the modulation mode.
18. The ad-hoc network system according to claim 17,
the transmitting node is configured to determine N RU And according to said modulation coding level and said N RU Searching a preset TBS table to determine the size of the transmission block;
wherein, the N is RU Determining according to the number of carriers and the number of frames;
the TBS table is used to indicate the { modulation coding level, N RU And mapping relation between the size of the transmission block and the size of the transmission block.
19. The ad-hoc network system according to claim 18,
the TBS table is either predefined or configured by the PAN coordinator.
20. The ad-hoc network system according to claim 11,
the preset parameters are selected from: signal strength and signal-to-noise ratio.
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