CN112188565A - Mobile ad hoc network multi-user cooperative transmission method based on network allocation vector - Google Patents
Mobile ad hoc network multi-user cooperative transmission method based on network allocation vector Download PDFInfo
- Publication number
- CN112188565A CN112188565A CN202011016950.5A CN202011016950A CN112188565A CN 112188565 A CN112188565 A CN 112188565A CN 202011016950 A CN202011016950 A CN 202011016950A CN 112188565 A CN112188565 A CN 112188565A
- Authority
- CN
- China
- Prior art keywords
- node
- rts
- cts
- data
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000013598 vector Substances 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 title claims description 31
- 238000004891 communication Methods 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 101100172132 Mus musculus Eif3a gene Proteins 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 101000741965 Homo sapiens Inactive tyrosine-protein kinase PRAG1 Proteins 0.000 claims description 2
- 102100038659 Inactive tyrosine-protein kinase PRAG1 Human genes 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 description 9
- URWAJWIAIPFPJE-YFMIWBNJSA-N sisomycin Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H](CC=C(CN)O2)N)[C@@H](N)C[C@H]1N URWAJWIAIPFPJE-YFMIWBNJSA-N 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 230000003044 adaptive effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002222 downregulating effect Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/02—Hybrid access techniques
Abstract
The invention discloses a multi-user cooperative sending method of a mobile self-organizing network based on network allocation vectors, which obtains channel state information through RTS/CTS to complete self-adaptive rate selection and power control, and maintains simultaneous same-frequency communication links among multiple pairs of nodes based on an avoidance algorithm for updating the network allocation vectors; by designing a suitable media access control layer protocol, multiple nodes are allowed to transmit simultaneously within a hop range, the capability of simultaneously establishing multiple links by the MIMO technology is fully exerted, and the function of simultaneously transmitting multiple users is realized, so that the performances of throughput and the like of the mobile ad hoc network are improved.
Description
Technical Field
The invention relates to a multi-user cooperative sending method of a mobile ad hoc network based on network allocation vectors, belonging to the technical field of mobile ad hoc networks.
Background
A Mobile Ad Hoc Network (MANET) is a distributed Wireless Network, also called a Wireless Ad Hoc Network (WANET), and has characteristics of decentralization, point-to-point, self-organization, self-healing, and the like. The routing algorithm dynamically determines which nodes transfer data according to the link condition without building infrastructure such as a base station or a wireless access point in advance but organizing each node in the network spontaneously. This approach avoids complex infrastructure construction and management, allowing mobile devices to create and join networks anytime and anywhere.
The multi-antenna MIMO technology can not only improve the transmission efficiency of point-to-point communication, but also realize space division multiple access in a wireless network communication scene, and concurrently transmit multiple data streams, thereby improving the network throughput efficiency. The MIMO technology is applied to the mobile self-organizing network, and the communication performance can be obviously improved. However, MIMO, which is a physical layer technology, affects not only a physical layer but also a medium access control layer (MAC) when it is integrated into a mobile ad hoc network.
The common distributed access method of the MAC layer is a carrier sense multiple access and collision avoidance protocol, namely CSMA/CA, reduces collision probability through random backoff before sending a data packet, and ensures the robustness of the protocol under complex conditions through a binary exponential backoff algorithm. In order to solve the RTS/CTS mechanism introduced for the hidden terminal problem, RTS control frames are broadcasted by a sending node, CTS control frames are broadcasted by a receiving node, the data transmission to be carried out by an articulated point is informed, and the articulated point is coordinated to enter a virtual carrier monitoring state for active silence so as to reduce interference.
Considering that a multi-antenna MIMO system can achieve concurrent transmission of multiple data streams through a beamforming coding technique and only allows a single user to send a signal, overhead of control information such as backoff time and RTS/CTS is large. The RTS/CTS mechanism has good expandability, backward compatibility can be guaranteed, and meanwhile, a user has the potential of knowing complex network conditions by using reserved fields, expansion functions and other modes, adaptive rate selection and power control of a combined physical layer and an MAC layer are realized, the capacity of establishing multiple links simultaneously and the function of simultaneous transmission of multiple users are effectively exerted, and the function of simultaneous transmission of multiple users is realized.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-user cooperative sending method of a mobile self-organizing network based on network allocation vectors, fully exerting the capability of the MIMO technology of simultaneously establishing a plurality of links, realizing the function of simultaneously transmitting multiple users, and improving the performances of the mobile self-organizing network such as throughput and the like.
In order to solve the technical problem, the invention relates to a mobile ad hoc network multi-user cooperative transmission method based on network allocation vectors, which comprises the following steps:
a first part:
the first part of the invention, the MAC layer access algorithm supporting multi-user simultaneous transmission, is obtained by improving the NAV mechanism and CSMA/CA avoidance algorithm. In the conventional CSMA/CA protocol, node i records the session time requested by other nodes in the network, which is known through RTS/CTS, and sets it as the end time of the virtual carrier sense state. To retain more information, the invention records the number NAV of pairs of nodes that are about to or are in conversation with, and the time t at which the conversation is to be ended in anticipation of successful ACK reception by other nodesend. The method comprises the following specific steps:
firstly, on the basis of CSMA/CA protocol with RTS/CTS mechanism, the transmitting node firstly sends RTS to inform other nodes of the bit number of data to be sent, i.e. the transmitting node contains the bit number information B of the requested transmissionrequest. After receiving RTS and replying CTS, the receiving node can inform the sending node to make proper rate selection and power control according to the surrounding channel environment, and according to the second part of the invention, the joint adaptive rate selection and power control of the physical layer and MAC layer are carried out, i.e. according to the second part, the joint adaptive rate selection and power control of the physical layer and MAC layer are carried outAnd obtaining the time length T of the data packet according to the rate selection and the data bit number requested in the RTSdata。
When the sending rate needs to be adjusted according to the channel state of the receiving node, the time length required for transmitting the data to be transmitted requested in the RTS needs to be correspondingly adjusted; the following scheme may be taken to accommodate rate adjustment:
let the silent jointless point record the session end time t after receiving RTSend＝tcurrent+Tcts(ii) a If the CTS frame replying the RTS is received in the period, the time length T of the data packet indicated in the CTS packet is determineddataUpdating a record tend＝tcurrent+SIFS+Tdata+SIFS+Tack。
Secondly, each node records and maintains a counter NAV, when a certain node in the network receives RTS sent to other nodes, the modification counter NAV is NAV +1 and records the session end time t correspondinglyend＝tcurrent+TctsUntil the time t passesendThe post-counter NAV subtracts 1 and deletes the corresponding record tend；tcurrentIs the current time, TctsThe length of time of the CTS packet.
Thirdly, other nodes (third-party nodes) sense that the data packet duration is T in the CTS packet fed back to the node A (sending node)dataRecording the predicted session end time as tend＝tcurrent+SIFS+Tdata+SIFS+Tack(ii) a SIFS here is the short interframe space, TackRepresenting the time duration required to complete the transmission of one ACK or NACK packet. If the node (i.e. the third party node) has sensed the RTS packet corresponding to the CTS in the second step, and records tendThen t is out of dateendT should be newendAnd (4) replacing.
Fourthly, allowing M pairs of users in a one-hop range to simultaneously transmit by the MIMO system adopting the beam forming technology, considering that a channel is busy when a counter NAV of any node is larger than or equal to M, enabling the node to enter a virtual carrier sensing state, stopping detecting a physical channel and suspending a backoff process, and not initiating data transmission until the counter meets the condition NAV < M and continuing communication or resuming the backoff process; m is a settable parameter, which is an upper limit of the number of links simultaneously transmitted within a hop range, and M is an integer greater than or equal to 2 to realize the capability of multi-user simultaneous transmission.
A second part:
the second part is the adaptive rate selection and power control algorithm that combines the physical and MAC layers. In conventional MAC layer adaptive rate control, the MAC layer estimates the link status based on whether an acknowledgment frame is received after each data frame transmission, and adjusts the transmission rate with a delay. The invention estimates and feeds back the RTS/CTS channel to the MAC layer through the physical layer of the node, adds the channel state information into the control frame and sends the control frame to the destination node, so that the MAC layer has the capability of acquiring the channel information in real time and adjusting the transmitting rate and the power. In complex channel situations when multiple pairs of users communicate simultaneously, the transmitting node may adjust the transmission parameters according to the channel situation in which the receiving node is located. The method comprises the following specific steps:
in the first step, the transmitting node requires the lowest modulation and coding scheme and the maximum transmitting power P with the signal-to-noise ratioMAXBroadcasting RTS, so as to inform the occupation of the channel with the maximum capability and ensure that the connection with the lowest requirement on the signal-to-noise ratio is established;
secondly, after the receiving node receives the RTS frame, the receiving node receives the SINR of the RTS framertsAccording to the SNR requirement of each Modulation Coding Scheme (MCS), the Modulation Coding Scheme (MCS) corresponding to the highest rate that the SNR can support can be searchedOPTAnd a maximum transmission power P for matching the modulation and coding schemeMAXDown regulated power ΔdB。
Thirdly, the MCS selected in the second stepOPTAnd ΔdBAnd writing the CTS to feed back to the sending node, so that the sending node can select an optimized MCS scheme and sending power to send the data frame.
Receiving node MCS according to modulation coding schemeOPTAnd the number of required transmission bits BrequestCalculating the actual time length T required for sending the data packetdata。
The mobile ad hoc network needs to ensure compatibility with the ethernet and the IEEE 802.11 and other classical wireless access networks, and a mobile ad hoc network structure is shown in fig. 1. Therefore, on the basis of a wireless access protocol specified by IEEE 802.11, the invention adds the functions of channel estimation, control information broadcasting and the like of RTS/CTS, so that the node obtains the information of channel state, the sending state of other nodes and the like, realizes the self-adaptive rate selection and power control scheme combining the physical layer and the MAC layer, redesigns a back-off algorithm, judges the opportunity of entering a virtual carrier monitoring state according to the channel state and controls the number of simultaneous transmissions not to exceed the upper limit.
A conventional CSMA/CA protocol is briefly explained first. When a node has a data frame to transmit, a Clear Channel Assessment (CCA) is performed, including Carrier Sense (CS) and Energy Detection (ED). If the channel is judged to be idle, the random backoff process is started after a Distributed Inter-Frame Spacing (DIFS) is waited. As shown in fig. 2, a node first selects a random integer according to uniform distribution in a Contention Window (CW) and sets the random integer as a count value of a backoff counter, the node performs channel idle evaluation every time slot, if the channel is idle, the count value of the backoff counter is decremented by 1 until the counter is decremented to 0, the node immediately starts a data transmission process, and if the receiving node successfully receives data, an ACK frame is replied to confirm that the data is successful.
The sending node which starts RTS/CTS mechanism broadcasts RTS frame including information of destination node and time length to be sent data, if the receiving node judges that it can receive, it replies CTS frame including information of time length to be received. If the node acquires information such as destination nodes and time length of data frames sent by other nodes, the node automatically judges whether the node enters a receiving state or a virtual carrier sensing state, reserves a rollback state and suspends a rollback process. The virtual carrier sensing means that when the node determines that it is not necessary to receive the next data frame through the control information, the node records the time when the channel is expected to be continuously busy in a Network Allocation Vector (NAV), and actively turns off the physical carrier sensing before the time to stop unnecessary reception and channel idle evaluation, thereby reducing the interference possibly existing in the channel.
The invention obtains the channel state information through RTS/CTS to complete the self-adaptive rate selection and power control, and maintains the simultaneous same-frequency communication link between a plurality of pairs of nodes based on the avoidance algorithm of updating Network Allocation Vector (NAV). By designing a suitable media access control layer protocol, a plurality of nodes are allowed to transmit simultaneously within a hop range.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a mobile ad hoc network.
Fig. 2 shows the contention channel procedure of the CSMA/CA protocol.
Fig. 3 is a scenario of simultaneous communication of multiple users.
FIG. 4 is a flow chart of a network allocation vector-based multi-user cooperative algorithm according to the method of the present invention.
Fig. 5 is a graph comparing throughput of three systems under different flow models in a simulation experiment.
Detailed Description
A mobile ad hoc network multi-user cooperative transmission method based on network allocation vectors comprises the following steps:
a first part:
firstly, on the basis of CSMA/CA protocol with RTS/CTS mechanism, a sending node firstly sends RTS and informs other nodes of bit number information B requesting transmissionrequest. After receiving RTS, the receiving node calculates the rate selection and power adjustment according to the second part of the invention, and writes the rate and power information into CTS packet for reply; the receiving node also calculates the time length T actually needed by the data packet according to the modulation coding scheme and the needed transmission bit numberdataAnd writes it in a CTS packet.
Secondly, when a node in the network receives RTS to other nodes, the modification counter NAV is equal to NAV +1 and the session end time t is recorded correspondinglyend＝tcurrent+SIFS+TctsIn which SIFS is a short interframe space, TctsThe time required for predicting the response of the CTS frame until the time t passesendThe post-counter NAV subtracts 1 and deletes the corresponding record tend。
Thirdly, after receiving the CTS fed back by the receiving node, changing a modification counter NAV to NAV +1, and recording the time t from the NAV +1end＝tcurrent+SIFS+Tdata+SIFS+TackWherein T isdataFor packet transmission intervals, T, calculated according to a specified rate of the receiving nodeackAn interval is sent for ACK. Past the time tendThe post-counter NAV subtracts 1 and deletes the corresponding record tend。
Fourthly, the MIMO system adopting the beam forming technology allows up to MrDetermination of channel busy condition, NAV, for simultaneous user transmissioni≥MrThe time considers that the channel is busy, the node enters a virtual carrier sensing state, stops detecting the physical channel and suspends the rollback process until the counter meets the condition NAVi＜MrAnd then continuing communication or recovering the rollback process.
A second part:
firstly, a sending node broadcasts RTS (request to send) according to a Modulation and Coding Scheme (MCS) with the lowest signal-to-noise ratio requirement and the maximum power, so that the maximum capacity is notified of channel occupation, and the connection with the lowest signal-to-noise ratio requirement is ensured to be established.
Secondly, after the receiving node receives the RTS frame, the receiving node receives the SINR of the RTS framertsdB, according to the SNR and the packet error rate performance of the modulation coding scheme specified by the protocol, the highest modulation coding scheme MCS which can be supported by the SNR can be searchedOPTAnd the signal-to-noise ratio ρ needed to support the ratercmddB。
Third, the receiving node combines the MCS with the MCSOPTAnd down-regulating the value delta from the maximum transmit power required to support the coded modulation schemedBAnd writing the CTS back to the sending node, and realizing self-adaptive rate selection and power control of the sending node according to the channel state of the receiving node.
Fourthly, the transmitting node reverses according to the CTSFed MCSOPTAnd ΔdBAnd selecting the optimal MCS scheme and the transmission power to transmit the data frame.
Taking a certain node i in a mobile ad hoc network as an example, fig. 4 describes how the proposed joint control algorithm of the physical layer and the MAC layer based on MIMO maintains simultaneous communication of a plurality of pairs of nodes. Wherein CEiChannel energy, ED, for channel detection estimation before sending a signal for node ithresholdIs a threshold for Channel Assessment (CCA).
A simulation experiment is carried out on discrete event simulators of a physical layer and a MAC layer of the wireless self-organizing network by using Matlab. Setting MIMO node to have M in simulationrSISO node has M as 4 antennasrThe bandwidth is 20Mhz for 1 antenna, the default transmission power is 20dBm, and the receiver thermal noise is Pn-101dBm, antenna gain Ga2dBi, 1m reference path loss is l0The path loss index is-40 dB, and k is 3, namely the path loss at 10m is-40 dB-30 dB-70 dB. The normalized path loss model obtained by considering the bottom noise of the receiver is L-2Ga+l0-10klog10Z-Pn. Wherein G isaIs the antenna gain, PnZ is the distance between two nodes for thermal noise power.
The default set of system parameters at the time of the simulation are given in table 1. In table PmaxFor maximum transmit power, B is the bandwidth, Ldata、LRTS、LCTSAnd LACKThe length, t, of the data frame, RTS frame, CTS frame and ACK frame, respectivelyslot、tSIFSAnd tDIFSRespectively, the duration of the unit time slot, the short interframe space and the distributed interframe space.
TABLE 1 System parameter Table
As shown in fig. 3, in a square area with a side length d of 50m, there are N mobile ad hoc network nodes, the positions of the nodes are uniformly and randomly distributed, and since all the nodes are within the communication range of other nodes, a scenario 1 is a single-hop mobile ad hoc network. In the simulation, the nodes generate data flow in pairs, a sending node generates a data packet with a fixed length every time the sending node passes through the random time of exponential distribution, and the expected mu value of the time interval of generating two data packets by each pair of nodes is 1ms and 10ms, which respectively correspond to a saturated flow model and a non-saturated flow model.
The experimental result is the average value of multiple simulation results, the total time of one-time simulation is 150ms, wherein the first 50ms is the time reserved for the system to enter a steady state, and each performance index starts to be counted after 50ms, so that the performance of the system after entering the steady state can be accurately plotted.
Compared with the traditional SISO system, the MIMO-SU system which only adopts the MIMO technology to change the MAC layer in the physical layer and the MIMO-MU system which is realized by adopting the method, the simulation experiment has the advantages that the throughput of the three modes under different flow models is shown in figure 5. As can be seen from the comparison of the throughput of the systems, the throughput of the MIMO system is much higher than that of the SISO system under the saturated flow model, and the MIMO-SU can be regarded as the SISO system which is improved only in the physical layer, the throughput of the MIMO-SU is 2 times to 4 times that of the SISO, and the overall trend is the same as that of the SISO. When the time interval of generating two data packets by each pair of nodes is expected to be 10ms, the throughput of SISO and MIMO-SU when the number of the nodes is lower than 10 pairs is lower than the throughput of which the expected mu is 1ms, and the flow in the network is not saturated; when the number of nodes is more than 10 pairs, the data packets of each node cannot be sent in time, and the traffic in the network begins to be saturated. For MIMO-MU, after the number of nodes is more than 25 pairs, the throughput curve with the expected MU of 10ms begins to tend to be flat, and the difference between the throughput curve with the expected MU of 1ms and the throughput curve with the expected MU of about 10Mbps exists.
In order to better illustrate the operating characteristics of the communication system realized based on the method, in the simulation scenario, taking a saturated traffic network with 10 pairs of nodes as an example, a 10ms link state is obtained, and the start time and the end time of a data frame transmitted by each link and the received signal-to-interference-and-noise ratio of the data frame are recorded. Therefore, the MIMO-MU system realized based on the method can effectively operate, the design of multi-user simultaneous transmission enables the quantity of data packets which can be sent in the same time period to be about 3 times that of SISO, and the throughput of the whole network is improved.
The above embodiments do not limit the present invention in any way, and all technical solutions obtained by means of equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (3)
1. A mobile ad hoc network multi-user cooperative transmission method based on network allocation vectors is characterized in that:
a first part:
firstly, on the basis of CSMA/CA protocol with RTS/CTS mechanism, the transmitting node firstly sends RTS to the receiving node, which contains bit number information B requesting transmissionrequest(ii) a After receiving RTS, when replying CTS, the receiving node carries out the joint self-adapting rate selection and power control of the physical layer and the MAC layer according to the second part, and obtains the time length T of the data packet according to the rate selection and the data bit number requested in RTSdata；
Secondly, each node records and maintains a counter NAV, when a certain node in the network receives RTS sent to other nodes, the modification counter NAV is NAV +1 and records the session end time t correspondinglyend＝tcurrent+TctsUntil the time t passesendThe post-counter NAV subtracts 1 and deletes the corresponding record tend；tcurrentIs the current time, TctsThe time length of the CTS packet;
thirdly, the third-party node monitors that the duration of the data packet in the CTS packet fed back to the sending node by the receiving node is TdataPredicted session end time tendIs recorded as tend＝tcurrent+SIFS+Tdata+SIFS+Tack(ii) a SIFS is short interframe space, TackRepresents the time length required for transmitting an ACK or NACK packet; if the third party node has sensed the RTS packet corresponding to the CTS in the second step, and records tendThen t is out of dateendT should be newendReplacement is carried out;
fourthly, allowing M pairs of users in a one-hop range to simultaneously transmit by the MIMO system adopting the beam forming technology, considering that a channel is busy when a counter NAV of any node is larger than or equal to M, enabling the node to enter a virtual carrier sensing state, stopping detecting a physical channel and suspending a backoff process, and not initiating data transmission until the counter meets the condition NAV < M and continuing communication or resuming the backoff process; m is a settable parameter and is the upper limit of the number of links which are simultaneously transmitted in a hop range;
a second part:
in the first step, the transmitting node requires the lowest modulation and coding scheme and the maximum transmitting power P with the signal-to-noise ratioMAXBroadcasting RTS, so as to inform the occupation of the channel with the maximum capability and ensure that the connection with the lowest requirement on the signal-to-noise ratio is established;
secondly, after the receiving node receives the RTS frame, the receiving node receives the SINR of the RTS framertsAccording to the SNR requirement of each modulation coding scheme, the modulation coding scheme MCS corresponding to the highest rate which can be supported by the SNR can be searchedOPTAnd a maximum transmission power P for matching the modulation and coding schemeMAXDown regulated power ΔdB；
Third, the MCS selected in the second step is combined with the second partOPTAnd ΔdBAnd writing the CTS to feed back to the sending node, so that the sending node can select an optimized MCS scheme and sending power to send the data frame.
2. The multi-user cooperative transmission method for the mobile ad hoc network based on the network allocation vector of claim 1, wherein: receiving node MCS according to modulation coding schemeOPTAnd the number of required transmission bits BrequestCalculating the actual time length T required for sending the data packetdata。
3. The multi-user cooperative transmission method for the mobile ad hoc network based on the network allocation vector of claim 2, wherein the following scheme is adopted to adapt the rate adjustment: let the silent jointless point record the session end time t after receiving RTSend＝tcurrent+Tcts(ii) a During which if a CTS frame is received in reply to the RTS, it is further processedNew record tend＝tcurrent+SIFS+Tdata+SIFS+Tack。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011016950.5A CN112188565A (en) | 2020-09-24 | 2020-09-24 | Mobile ad hoc network multi-user cooperative transmission method based on network allocation vector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011016950.5A CN112188565A (en) | 2020-09-24 | 2020-09-24 | Mobile ad hoc network multi-user cooperative transmission method based on network allocation vector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112188565A true CN112188565A (en) | 2021-01-05 |
Family
ID=73955485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011016950.5A Pending CN112188565A (en) | 2020-09-24 | 2020-09-24 | Mobile ad hoc network multi-user cooperative transmission method based on network allocation vector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112188565A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113347736A (en) * | 2021-07-06 | 2021-09-03 | 南京大学 | MIMO-based mobile ad hoc network multipoint communication method |
| CN115134935A (en) * | 2022-08-25 | 2022-09-30 | 珠海迈科智能科技股份有限公司 | Data transmission method and system for avoiding channel communication conflict |
| CN115884343A (en) * | 2023-02-17 | 2023-03-31 | 天地信息网络研究院(安徽)有限公司 | High-mobility ad hoc network dynamic power distribution method based on directional multi-beam antenna |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1794687A (en) * | 2006-01-06 | 2006-06-28 | 中国人民解放军理工大学 | Adaptive dormancy method of network data chain circuit layer of cluster structured radio sensor |
| CN102149210A (en) * | 2011-05-12 | 2011-08-10 | 西安电子科技大学 | Cognitive cooperation multiple access method |
| CN103119982A (en) * | 2010-09-22 | 2013-05-22 | 高通股份有限公司 | Request to send (RTS) and clear to send (CTS) for multichannel operations |
| CN103384245A (en) * | 2013-05-30 | 2013-11-06 | 上海交通大学 | Method for preventing channel preemption and attack in wireless network |
| US20170257888A1 (en) * | 2016-03-04 | 2017-09-07 | Apple Inc. | Wireless channel reservation |
| CN107409035A (en) * | 2015-04-24 | 2017-11-28 | 英特尔Ip公司 | Ask to send device, computer-readable medium and the method with clear to send for the multi-user in efficient WLAN |
| US20200288466A1 (en) * | 2019-03-07 | 2020-09-10 | Hyundai Motor Company | Method and apparatus for multi-channel access in wireless local area network |
-
2020
- 2020-09-24 CN CN202011016950.5A patent/CN112188565A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1794687A (en) * | 2006-01-06 | 2006-06-28 | 中国人民解放军理工大学 | Adaptive dormancy method of network data chain circuit layer of cluster structured radio sensor |
| CN103119982A (en) * | 2010-09-22 | 2013-05-22 | 高通股份有限公司 | Request to send (RTS) and clear to send (CTS) for multichannel operations |
| CN102149210A (en) * | 2011-05-12 | 2011-08-10 | 西安电子科技大学 | Cognitive cooperation multiple access method |
| CN103384245A (en) * | 2013-05-30 | 2013-11-06 | 上海交通大学 | Method for preventing channel preemption and attack in wireless network |
| CN107409035A (en) * | 2015-04-24 | 2017-11-28 | 英特尔Ip公司 | Ask to send device, computer-readable medium and the method with clear to send for the multi-user in efficient WLAN |
| US20170257888A1 (en) * | 2016-03-04 | 2017-09-07 | Apple Inc. | Wireless channel reservation |
| US20200288466A1 (en) * | 2019-03-07 | 2020-09-10 | Hyundai Motor Company | Method and apparatus for multi-channel access in wireless local area network |
Non-Patent Citations (3)
| Title |
|---|
| W HU等: "Load Adaptive MAC： A Hybrid MAC Protocol for MIMO SDR MANETs", 《IEEE》 * |
| 王宇: "基于NS2的水下自组网MAC层协议涉及", 《CNKI硕士电子期刊》 * |
| 王锐;徐;: "基于竞争式MAC接入的移动Adhoc网络建模与仿真", 火力与指挥控制, no. 04 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113347736A (en) * | 2021-07-06 | 2021-09-03 | 南京大学 | MIMO-based mobile ad hoc network multipoint communication method |
| CN113347736B (en) * | 2021-07-06 | 2023-01-06 | 南京大学 | MIMO-based mobile ad hoc network multipoint communication method |
| CN115134935A (en) * | 2022-08-25 | 2022-09-30 | 珠海迈科智能科技股份有限公司 | Data transmission method and system for avoiding channel communication conflict |
| CN115884343A (en) * | 2023-02-17 | 2023-03-31 | 天地信息网络研究院(安徽)有限公司 | High-mobility ad hoc network dynamic power distribution method based on directional multi-beam antenna |
| CN115884343B (en) * | 2023-02-17 | 2023-05-02 | 天地信息网络研究院(安徽)有限公司 | High-mobility ad hoc network dynamic power distribution method based on directional multi-beam antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101585831B1 (en) | Method and system for controlling access to a wireless communication medium | |
| US7733766B2 (en) | System and method for providing quality of service provisions and congestion control in a wireless communication network | |
| JP6635165B2 (en) | Wireless communication device and wireless communication method | |
| US8681810B2 (en) | Dynamic carrier sensing thresholds | |
| EP2057805B1 (en) | Monitor period for asynchronous wireless communication | |
| US8068428B2 (en) | System and method for performing topology control in a wireless network | |
| CN112188565A (en) | Mobile ad hoc network multi-user cooperative transmission method based on network allocation vector | |
| JP2004533158A (en) | Instantaneous integrated transmit power control and link adaptation for RTS / CTS based channel access | |
| EP2995009A1 (en) | Cooperative mac protocol with relay selection and power control | |
| JP2004530349A (en) | Increase link capacity through simultaneous transmission in centralized wireless LAN | |
| Takata et al. | A dual access mode MAC protocol for ad hoc networks using smart antennas | |
| JP2008524898A (en) | Multicast communication system with power control | |
| WO2009113031A2 (en) | Robust coding in multi-hop networks | |
| Bhattacharyya et al. | Cross layer MAC protocol for a peer conscious opportunistic network coded cooperation system | |
| JP4674223B2 (en) | Broadcast signaling using receiver feedback and busy burst | |
| Wang et al. | MAC trade-offs between age and reachability of information in vehicular safety applications | |
| Liu et al. | A relay-contention-free cooperative MAC protocol for wireless networks | |
| WO2002003567A9 (en) | Adaptive power control for wireless networks | |
| Li et al. | A rapid cooperation-differentiated medium access control protocol with packet piggyback for multihop wireless networks | |
| Chan | A mac protocol for full duplex cellular networks | |
| Max et al. | Analysis ofWiMedia-based UWB Mesh Networks | |
| Takata et al. | An extended directional MAC for location information staleness in ad hoc networks | |
| Lee et al. | Signaling-free max-min airtime fairness in IEEE 802.11 ad hoc networks | |
| Lin et al. | An interference graph based MAC protocol for ad hoc wireless networks | |
| EP4353001A1 (en) | Method and device for controlling interference among autonomous wireless communication links |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |