CN110996269A - Wireless ad hoc network QoS enhancement application method based on token ring - Google Patents
Wireless ad hoc network QoS enhancement application method based on token ring Download PDFInfo
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- H—ELECTRICITY
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- H04W28/00—Network traffic management; Network resource management
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
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- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
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Abstract
The invention relates to a token ring-based QoS (quality of service) enhancement application method of a wireless ad hoc network, belonging to the technical field of wireless ad hoc networks. The invention comprises three steps, on the premise of not changing the general frame structure of the token ring protocol frame format, only transmits the enhanced key data packet between two nodes by applying for the reserved special time slot, and any other nodes which correctly receive the data packet all broadcast the data packet at the same time, thereby realizing the transmission of key instructions and voice data packets in the ad hoc network system with high reliability and low time delay, avoiding the data stream from being discarded, and meeting the requirements of users on different application and different service qualities. The method solves the problems that the data transmission performance is limited by the worst transmission performance between two adjacent token nodes before QoS enhancement application, and the transmission delay is increased and the transmission of key data packets is seriously influenced due to the fact that the error probability of transmission packets is greatly increased when the number of the token ring nodes is increased under multi-hop transmission.
Description
Technical Field
The invention relates to a token ring-based QoS (quality of service) enhancement application method of a wireless ad hoc network, belonging to the technical field of wireless ad hoc networks.
Background
The logic transmission mode of the token ring network is a ring topology structure transmission mode, one token of the token ring network is sequentially transmitted among the network-accessing node ad hoc network terminals along a ring bus in sequence, the token is actually a frame with a special format and used for controlling the use of a channel, and only one node can monopolize the channel at the same time, so that the access right is fair for all the network-accessing ad hoc network terminals. However, once the token ring network loses the token, it cannot work, and a special node needs to be selected to monitor and manage the token. In the token ring-based ad hoc network system, only a token holder can transmit within each frame, so that the data transmission performance is limited by the transmission performance between two worst token adjacent nodes; in addition, in the case of multi-hop transmission, the delay of a transmission packet depends on the number of hops, so that when the number of nodes of the token ring increases, the transmission delay also increases accordingly. Therefore, it is necessary to develop a method for enhancing QoS of a wireless ad hoc network based on a token ring.
Disclosure of Invention
The invention aims to provide a token ring based wireless ad hoc network QoS enhancement application method which does not change the general frame of the token ring protocol frame format, only transmits an enhancement type key data packet between two nodes by reserving a special time slot, and any other node which correctly receives the data packet broadcasts the data packet at the same time, thereby realizing the transmission of key instructions and voice data packets in an ad hoc network system with high reliability and low time delay, avoiding data stream discarding and meeting different service quality requirements of users for different applications.
The invention realizes the purpose through the following technical scheme:
a token ring-based QoS enhancement application method of a wireless ad hoc network is characterized in that: the method is realized by the following steps:
step one, reserving special time slot, enhancing transmission reliability and reducing transmission time delay
Aiming at key instructions and voice data packets, all nodes forward the key data packets in reserved special time slots through a QoS simultaneous broadcast mechanism and a time slot reservation mechanism, and the transmission limitation condition of the worst adjacent nodes of the key data packets is effectively relieved; the multi-node broadcast key data packet has good effects of cooperative communication and diversity transmission, and the reliability of the transmission of the key data packet is greatly enhanced; the multiple nodes broadcast the key data packet at the same time, so that the transmission hop count from the sending node to the target node is changed into the shortest hop count between the two nodes from the original fixed hop count, and the transmission delay of the key data packet is effectively reduced.
Step two, applying for the work flow of reserving the special time slot
Assuming that n nodes A1, A2, … and An exist in the token ring, and assuming that the sending node A1 wishes to send a QoS enhanced key data packet to the target node Am (m is more than or equal to 2 and less than or equal to n), firstly, the node A1 needs to send a reservation application packet to the node A2 in a common token ring transmission mode, if the node A2 can correctly receive the packet, the node A2 forwards the packet to the node A3 in the self transmission frame, otherwise, the node A1 needs to restart the node reservation application flow, and similarly, the communication processes of all the following nodes are similar; when the last node An also correctly receives the reservation application packet and loops back to the node A1, the node A1 confirms that the reservation application is successful, and starts to send An enhanced key data packet to Am in the reserved special time slot from this moment; during the reserved dedicated slot transmission phase, each node Ak that correctly receives the reserved dedicated slot enhanced key packet forwards the packet in the dedicated slot of each subsequent frame until the token returns to node a1 again, at which point node a1 will transmit the next reserved dedicated slot key packet.
Step three, canceling the working flow of the reserved special time slot
After the node A1 completes the transmission of the QoS enhanced key data packet, the reserved special time slot needs to be cancelled, and the flow of canceling the reserved special time slot is similar to the flow of applying for the reserved special time slot; the node A1 sends a reservation cancellation packet to the node A2 in the reserved special time slot, if the node A2 can correctly receive the packet, the node A2 forwards the packet to the node A3 in the self transmission frame, otherwise, the node A1 needs to restart the cancellation process of the reserved special time slot of the node; by analogy, after all nodes successfully receive the reservation canceling packet, the reservation canceling process of the reserved special time slot is successfully completed.
Compared with the prior art, the invention has the beneficial effects that:
the QoS enhancement application method of the wireless ad hoc network based on the token ring only transmits an enhancement type key data packet between two nodes by reserving a special time slot, and any other node which correctly receives the enhancement type key data packet simultaneously broadcasts the data packet by a simultaneous broadcasting mechanism, thereby realizing the transmission of key instructions and voice data packets in the ad hoc network system with high reliability and low time delay, avoiding the discarding of data streams and meeting the requirements of users on different application and different service qualities; the transmission performance of the instruction and the voice key data packet is greatly improved, and the transmission delay is effectively shortened. The method solves the problems that the data transmission performance is limited by the worst transmission performance between two adjacent token nodes before QoS enhancement application, and the transmission delay is increased and the transmission of key data packets is seriously influenced due to the fact that the error probability of transmission packets is greatly increased when the number of the token ring nodes is increased under multi-hop transmission.
Drawings
FIG. 1 is a flow chart of a reservation application of a dedicated time slot of a token ring based QoS enhancement application method of a wireless ad hoc network;
fig. 2 is a schematic diagram of node distribution and transmission performance of a token ring-based QoS enhancement application method for a wireless ad hoc network;
FIG. 3 is a flow chart of reservation cancellation for dedicated time slots of a token ring based QoS enhancement application method for a wireless ad hoc network;
fig. 4 is a diagram illustrating conventional token ring data communication.
Detailed Description
The research and development ideas of the applicant of the invention are as follows: in a traditional token ring based ad hoc network system, different services have different priorities, such as some critical instructions, voice, and need high-reliability and low-delay transmission. Within each frame, only the token holder can transmit, so the data transmission performance is limited by the transmission performance between the worst two token adjacent nodes; in addition, under multi-hop transmission, the delay of a transmission packet depends on the number of hops, and if the node a needs to send a data packet to the node D, it needs to go through 3 hops of a- > B, B- > C, C- > D to complete the transmission, and if the transmission performance between any pair of adjacent nodes in the 3 hops is poor, the transmission packet has a high error probability, which increases the delay of transmission and retransmission of a system packet, blocks communication time, and reduces communication quality.
The applicant considers that in the ad hoc network system, different services have different priorities, such as the highest priority of the key instructions and voice data packets for the ad hoc network system, the high transmission rate and the low delay transmission are important, and when the network is congested, all data flows are likely to be dropped. The applicant of the invention utilizes the function of overcoming network delay and blocking of a QoS Service Quality (Quality of Service) system, and adopts a flexible time slot reservation mechanism to reserve a special time slot aiming at the QoS Service type on the premise of not changing the overall structure of a token ring protocol frame format, wherein the reserved special time slot is only used for data packet transmission between two nodes, and any other node which correctly receives the packet broadcasts the packet at the same time; therefore, the applicant of the present invention proposes a method for enhancing QoS of a wireless ad hoc network based on a token ring.
The following describes in further detail an embodiment of the method for enhancing application of QoS in a wireless ad hoc network based on a token ring with reference to the accompanying drawings (see fig. 1 to 4):
a token ring-based QoS enhancement application method of a wireless ad hoc network is characterized in that: the method is realized by the following steps:
step one, reserving special time slot, enhancing transmission reliability and reducing transmission time delay
Aiming at key instructions and voice data packets, all nodes forward the key data packets in reserved special time slots through a QoS simultaneous broadcast mechanism and a time slot reservation mechanism, and the transmission limitation condition of the worst adjacent nodes of the key data packets is effectively relieved; the multi-node broadcast key data packet has good effects of cooperative communication and diversity transmission, and the reliability of the transmission of the key data packet is greatly enhanced; the multiple nodes broadcast the key data packet at the same time, so that the transmission hop count from the sending node to the target node is changed into the shortest hop count between the two nodes from the original fixed hop count, and the transmission delay of the key data packet is effectively reduced.
Step two, applying for the work flow of reserving the special time slot
Assuming that n nodes A1, A2, … and An exist in the token ring, and assuming that the sending node A1 wishes to send a QoS enhanced key data packet to the target node Am (m is more than or equal to 2 and less than or equal to n), firstly, the node A1 needs to send a reservation application packet to the node A2 in a common token ring transmission mode, if the node A2 can correctly receive the packet, the node A2 forwards the packet to the node A3 in the self transmission frame, otherwise, the node A1 needs to restart the node reservation application flow, and similarly, the communication processes of all the following nodes are similar; when the last node An also correctly receives the reservation application packet and loops back to the node A1, the node A1 confirms that the reservation application is successful, and starts to send An enhanced key data packet to Am in the reserved special time slot from this moment; during the reserved dedicated slot transmission phase, each node Ak that correctly receives the reserved dedicated slot enhanced key packet forwards the packet in the dedicated slot of each subsequent frame until the token returns to node a1 again, at which point node a1 will transmit the next reserved dedicated slot key packet.
Step three, canceling the working flow of the reserved special time slot
After the node A1 completes the transmission of the QoS enhanced key data packet, the reserved special time slot needs to be cancelled, and the flow of canceling the reserved special time slot is similar to the flow of applying for the reserved special time slot; the node A1 sends a reservation cancellation packet to the node A2 in the reserved special time slot, if the node A2 can correctly receive the packet, the node A2 forwards the packet to the node A3 in the self transmission frame, otherwise, the node A1 needs to restart the cancellation process of the reserved special time slot of the node; by analogy, after all nodes successfully receive the reservation canceling packet, the reservation canceling process of the reserved special time slot is successfully completed.
The QoS enhancement application method of the wireless ad hoc network based on the token ring needs to complete reservation application of a reserved special time slot and communication process definition in the reserved special time slot, and a traditional token ring protocol sending node A to a target node D needs to pass through 3 hops of A- > B, B- > C, C- > D. According to the QoS enhancement application method of the wireless ad hoc network based on the token ring, all nodes forward the key data packet in the reserved special time slot, so that the shortest transmission path is shortened to A- > E, E- > D and only 2 hops are needed. (see FIG. 3).
Assume that there are n nodes a1, a2, …, An; (see fig. 1) fig. 1 is a flowchart of the application for reservation of a dedicated slot of the present invention. Assuming that the sending node A1 wishes to send a QoS enhanced critical packet to the destination node Am (2 ≦ m ≦ n), first, node A1 needs to send a reservation request packet to node A2 in normal token ring transmission mode. If node a2 can correctly receive the packet, it forwards the packet to A3 in its transmission frame, otherwise a1 needs to restart the node reservation application flow, the communication process of the following nodes is similar, and after the last node An also correctly receives the reservation application packet and loops back to a1, node a1 confirms the success of the reservation application and from that point on sends the enhanced key data packet to Am in the reserved dedicated time slot.
During the transmission phase of the dedicated timeslot, each node Ak that correctly receives the dedicated timeslot packet forwards the packet in the dedicated timeslot of each subsequent frame until the token returns to node a1 again, at which point a1 will transmit the next dedicated timeslot packet.
Assuming node a1 completes the QoS enhanced data service, he needs to cancel the dedicated time slot previously reserved. (see fig. 2), the flow of the dedicated slot cancellation is similar to the flow of the reserved dedicated slot reservation application: node a1 sends a reservation cancellation packet to node a2 in the reserved dedicated slot, which node a2 forwards to A3 in its transmission frame if it can receive the packet correctly, otherwise a1 needs to resume the node reservation cancellation procedure. (see fig. 4), and so on, when all nodes successfully receive the reservation cancellation packet, the reservation cancellation procedure of the reserved dedicated slot is successfully completed.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (1)
1. A token ring-based QoS enhancement application method of a wireless ad hoc network is characterized in that: the method is realized by the following steps:
step one, reserving special time slot, enhancing transmission reliability and reducing transmission time delay
Aiming at key instructions and voice data packets, all nodes forward the key data packets in reserved special time slots through a QoS simultaneous broadcast mechanism and a time slot reservation mechanism, and the transmission limitation condition of the worst adjacent nodes of the key data packets is effectively relieved; the multi-node broadcast key data packet has good effects of cooperative communication and diversity transmission, and the reliability of the transmission of the key data packet is greatly enhanced; the multiple nodes broadcast the key data packet at the same time, so that the transmission hop count from the sending node to the target node is converted into the shortest hop count between the two nodes from the original fixed hop count, and the transmission delay of the key data packet is effectively reduced;
step two, applying for the work flow of reserving the special time slot
Assuming that n nodes A1, A2, … and An exist in the token ring, and assuming that the sending node A1 wishes to send a QoS enhanced key data packet to the target node Am (m is more than or equal to 2 and less than or equal to n), firstly, the node A1 needs to send a reservation application packet to the node A2 in a common token ring transmission mode, if the node A2 can correctly receive the packet, the node A2 forwards the packet to the node A3 in the self transmission frame, otherwise, the node A1 needs to restart the node reservation application flow, and similarly, the communication processes of all the following nodes are similar; when the last node An also correctly receives the reservation application packet and loops back to the node A1, the node A1 confirms that the reservation application is successful, and starts to send An enhanced key data packet to Am in the reserved special time slot from this moment; in the reserved special time slot transmission stage, each node Ak correctly receiving the reserved special time slot enhanced key data packet forwards the packet in the special time slot of each subsequent frame until the token returns to the node a1 again, and at this time, the node a1 transmits the next reserved special time slot key data packet;
step three, canceling the working flow of the reserved special time slot
After the node A1 completes the transmission of the QoS enhanced key data packet, the reserved special time slot needs to be cancelled, and the flow of canceling the reserved special time slot is similar to the flow of applying for the reserved special time slot; the node A1 sends a reservation cancellation packet to the node A2 in the reserved special time slot, if the node A2 can correctly receive the packet, the node A2 forwards the packet to the node A3 in the self transmission frame, otherwise, the node A1 needs to restart the cancellation process of the reserved special time slot of the node; by analogy, after all nodes successfully receive the reservation canceling packet, the reservation canceling process of the reserved special time slot is successfully completed.
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