CN105050186A - Broadband wireless ad hoc network MAC-layer protocol method based on TDMA - Google Patents
Broadband wireless ad hoc network MAC-layer protocol method based on TDMA Download PDFInfo
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- CN105050186A CN105050186A CN201510348534.8A CN201510348534A CN105050186A CN 105050186 A CN105050186 A CN 105050186A CN 201510348534 A CN201510348534 A CN 201510348534A CN 105050186 A CN105050186 A CN 105050186A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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- 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]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
Abstract
The invention relates to the technical field of wireless communication and specifically to a broadband wireless ad hoc network MAC-layer protocol method based on TDMA. The method comprises a step 1 of selecting a central control node in a network; a step 2 of enabling each node to send a control signaling at a control time slot thereof, wherein the control signaling comprises a neighbor state table and a time slot distribution table; a step 3 of enable each node to perform monitoring at a control time slot not belonging to the node; a step 4 of when each node acquires the whole-network topological structure information after a little interaction, enabling the central control node to distribute time slots according to the whole-network topological structure by using an improved sequence vertex coloring algorithm; a step 5 of enabling all nodes in the network to determine the service time slots of their own according to the time slot distribution table and to transmit data packets at the control time slots of their own; a step 6 of applying for a requirement at an access time slot if a new node get access to the network or a node is to exit the network; and a step 7 of jumping to the step 2. The method achieves time slot multiplexing and dynamic distribution.
Description
Technical field
The present invention relates to wireless communication technology field, be specifically related to a kind of broadband wireless MANET mac-layer protocol method based on TDMA.
Background technology
Mobile Ad hoc network is a kind of brand-new mobile communication technology, and it is a kind of multi-hop wireless communication network of non-stop layer self-organizing, and it can set up provisional network anywhere or anytime, does not need other existing fixation means.In order to realize the normal operation of wireless self-organization network, face many challenges and problem, wherein the design of channel access protocol is the key technical problem that Adhoc faces.Because wireless self-networking has the features such as non-stop layer, multi-hop, network topology change are large, so spatial reuse, clash handle, exposure/hidden terminal problem, fairness, a lot of technical barrier such as energy-conservation will be faced to the design work of MAC protocol.The more channel access protocol of current employing generally has FDMA(frequency division multiple access), CDMA(code division multiple access) and TDMA(time division multiple access) etc. three kinds of modes, it is high that FDMA and CDMA generally has cost, technology realize difficulty larger wait not enough.
Summary of the invention
Solve the problems of the technologies described above, the invention provides a kind of broadband wireless MANET mac-layer protocol method based on TDMA, realize the multiplexing of time slot and dynamic assignment, improve the network performance parameter such as network throughput, channel utilization.
In order to achieve the above object, the technical solution adopted in the present invention is, a kind of broadband wireless MANET mac-layer protocol method based on TDMA, described protocol frame structure comprises control channel CCH(ControlChannel), access channel RCH(RandomAccessChannel), Traffic Channel TCH(TrafficChannel), in wireless self-networking, each node carries out the mutual of control signal by control channel, each node utilizes Traffic Channel to carry out the transmission of business datum, each node is by access channel access network, and the method comprises the following steps:
Step 1, the center control nodes chosen in network;
Step 2, each node send control signaling at the control slot of oneself, and control signal comprises neighbor state table and Schedule;
Step 3, each node are monitored at oneself control slot non-;
Step 4, through repeatedly mutual, removing isolated node, each node can obtain full mesh topology structural information, and described Centroid carries out time slot allocation according to full mesh topology structure, and slot allocation method adopts the sequence vertex coloring algorithm improved;
Whole nodes in step 5, network determine oneself business time-slot according to Schedule, each node is at the control slot transmission packet of oneself;
If step 6 has new node network or have node to exit network, then send at access channel and network or logout request;
Step 7, jump to step 2.
Further, it is mutual that described control channel is used for control signal, and control channel adopts fixed allocation mode, and each node takies a unique control slot; Described access channel is used for when node networks used, is common signal channel, and node takies this access channel by competition, and node adopts S-ALOHA mechanism access channel; Described Traffic Channel is used for each node transmission data, and adopt fixed service number of time slots, each node is at least assigned to a time slot.
Further, each node takies a unique control slot, be specially: if control slot number K is less than total nodes N, the node not then being assigned to control slot sequentially distributes at next frame, until all peer distribution are complete, if control frame exists free timeslot, then that these time slots are idle, do not do any distribution, then from a new frame, sequentially carry out new round distribution, and this process that circulates.
Further, in step 1, described center control nodes is the arbitrary node in network; Because node each in network safeguards the topology information of the whole network, so arbitrary node can as center control nodes in network.
Further, in step 3, each node is monitored channel at oneself control slot non-, and be specially, each node judges packet rs destination address, if packet rs destination address is oneself or broadcast, then receives this packet, otherwise abandons.
Further, in step 4, slot allocation method adopts the sequence vertex coloring algorithm improved, and specifically comprises:
Step 41: node each in network is carried out sort descending according to a hop neighbor and two-hop neighbor node sum;
Step 42: check whether m time slot can distribute to i-th node;
Step 43: until all node-colorings are complete, first stage painted end;
Step 44: node each in network is carried out sort ascending according to a hop neighbor and two-hop neighbor node sum, after sequence, if there is the node that a hop neighbor is identical with two-hop neighbor node sum, then the order that the node of same population successively decreases according to a hop neighbor sum is resequenced;
Step 45: again check whether m time slot can distribute to i-th node;
Step 46: until all node traverses are complete, the painted end of second stage;
Step 47: the time slot allocation result obtained by said method can be occupied sort descending successively by how many nodes according to time slot;
Step 48: adopt the mode of circulation to carry out the filling of business time-slot, until fill up.
Further, whether m the time slot of the inspection in described step 42 can distribute to i-th node, its based on double bounce interior nodes can not the principle of same color, the principle that namely double bounce interior nodes can not take identical time slot checks.
The present invention is by adopting technique scheme, compared with prior art, tool has the following advantages: the present invention distributes time slot unitedly by Centroid, make transmission more reliable, adopt the sequence vertex coloring algorithm improved, make channel utilization higher, amount of calculation of the present invention is little, structure is simple, is easy to Project Realization.
Accompanying drawing explanation
Fig. 1 is MAC protocol frame assumption diagram of the present invention.
Fig. 2 is interaction diagrams of the present invention.
Fig. 3 is neighbor node state table of the present invention.
Fig. 4 is Schedule of the present invention.
Embodiment
Now the present invention is further described with embodiment by reference to the accompanying drawings.
As a specific embodiment, as shown in Figures 1 to 4, a kind of broadband wireless MANET mac-layer protocol method based on TDMA of the present invention, described protocol frame structure comprises control channel CCH(ControlChannel), access channel RCH(RandomAccessChannel), Traffic Channel TCH(TrafficChannel), in wireless self-networking, each node carries out the mutual of control signal by control channel, each node utilizes Traffic Channel to carry out the transmission of business datum, each node is by access channel access network
Described control channel is mutual for control signal, and as shown in Figure 2, adopt fixed allocation mode, each node takies a unique control slot to reciprocal process; Described access channel is used when networking for node, is common signal channel, and node takies this channel by competition, and the present embodiment node adopts S-ALOHA mechanism access channel; Described Traffic Channel is used for each node transmission data, and adopt fixed service number of time slots, each node is at least assigned to a time slot;
The method comprises the following steps:
Step 1, the center control nodes chosen in network, each node in network can as center control nodes, therefore can an optional node as center control nodes;
Step 2, suppose in network, to comprise N number of active node, node is numbered from 1 to N, control channel adopts fixed allocation mode, for the control slot that each peer distribution is unique, if control slot number K is less than total nodes N, the unallocated node to control slot sequentially distributes at next frame, until all peer distribution are complete.If control frame exists free timeslot, do not do any distribution, from a new frame, sequentially carry out new round distribution, and this process that circulates.
In network, each node will send control signaling to neighbor node at the control slot of oneself, broadcast the neighbor state table of oneself preservation and forward the Schedule received, and if will forward at this time slot when receiving the neighbor information table that other node ID changes, mutual through repeatedly, the Schedule of Centroid is finally restrained.
Step 3, each node maintenance transmit queue, queue comprises the neighbor state table record that needs upgrade.
If node is in listening state, first judges after receiving packet that the destination address wrapped is self or broadcast address, judge whether neighbor state changes by the sequence number of resolving packet header.Judge whether to add transmit queue with this and upgrade self neighbor state table; Judge whether to upgrade self Schedule by the life span of Schedule.
If node is in the sending time slots of self, whether be empty, be not the empty record then taken out in queue, and combine Schedule construction data bag and send if first detecting transmit queue.Otherwise send self neighbor state record and Schedule.
Step 4, be take turns with four frames, each node is taken turns every one and is upgraded self neighbor state record, and Centroid is taken turns every ten and obtained full mesh topology information according to receiving node state table, upgrades Schedule.Because each node all can obtain the topology information of the whole network, arbitrary node therefore can be selected as Centroid.Mutual through several times, each node can obtain full mesh topology structural information, and described Centroid carries out time slot allocation according to full mesh topology structure, and slot allocation method adopts the sequence vertex coloring algorithm improved, and is specially:
Step 41: node each in network is carried out sort descending according to a hop neighbor and two-hop neighbor node sum;
Step 42: check whether m time slot can distribute to i-th node; Check whether m time slot can distribute to i-th node, its based on double bounce interior nodes can not the principle of same color, the principle that namely double bounce interior nodes can not take identical time slot checks;
Step 43: until all node-colorings are complete, first stage painted end; Painted namely to all peer distribution time slots., meet each node and at least have a time slot.And the neighbours within double bounce successively put and can not distribute same time slot;
Step 44: node each in network is carried out sort ascending according to a hop neighbor and two-hop neighbor node sum, after sequence, if there is the node that a hop neighbor is identical with two-hop neighbor node sum, then the order that the node of same population successively decreases according to a hop neighbor sum is resequenced;
Step 45: again check whether m time slot can distribute to i-th node;
Step 46: until all node traverses are complete, the painted end of second stage;
Step 47: the time slot allocation result obtained by said method can be occupied sort descending successively by how many nodes according to time slot;
Step 48: adopt the mode of circulation to carry out the filling of business time-slot, until fill up.
Step 5, each node according to Centroid the Schedule sent out determine oneself Traffic Channel, each node is at least assigned with 1 time slot, each node carries out transmission message at the business time-slot of oneself, carries out intercepting and receipt message at oneself business time-slot non-.
If step 6 has new node network or have node to exit network, then carry out request application at access slot, a new control slot can be distributed to it after Centroid receives request, and this information broadcasting is gone out, if new node does not receive this information after a period of time, so just think that networking solicited message sends conflict, keep out of the way a period of time and send out again;
Step 7, jump to step 2.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (7)
1. the broadband wireless MANET mac-layer protocol method based on TDMA, it is characterized in that: described protocol frame structure comprises control channel, access channel, Traffic Channel, in wireless self-networking, each node carries out the mutual of control signal by control channel, each node utilizes Traffic Channel to carry out the transmission of business datum, each node is by access channel access network, and the method comprises the following steps:
Step 1, the center control nodes chosen in network;
Step 2, each node send control signaling at the control slot of oneself, and control signal comprises neighbor state table and Schedule;
Step 3, each node are monitored at oneself control slot non-;
Step 4, through repeatedly mutual, removing isolated node, each node can obtain full mesh topology structural information, and described Centroid carries out time slot allocation according to full mesh topology structure, and slot allocation method adopts the sequence vertex coloring algorithm improved;
Whole nodes in step 5, network determine oneself business time-slot according to Schedule, each node is at the control slot transmission packet of oneself;
If step 6 has new node network or have node to exit network, then send at access channel and network or logout request;
Step 7, jump to step 2.
2. a kind of broadband wireless MANET mac-layer protocol method based on TDMA according to claim 1, it is characterized in that: it is mutual that described control channel is used for control signal, control channel adopts fixed allocation mode, and each node takies a unique control slot; Described access channel is used for when node networks used, is common signal channel, and node takies this access channel by competition, and node adopts S-ALOHA mechanism access channel; Described Traffic Channel is used for each node transmission data, and adopt fixed service number of time slots, each node is at least assigned to a time slot.
3. a kind of broadband wireless MANET mac-layer protocol method based on TDMA according to claim 2, it is characterized in that: each node takies a unique control slot, be specially: if control slot number K is less than total nodes N, the node not then being assigned to control slot sequentially distributes at next frame, until all peer distribution are complete, if there is free timeslot in control frame, then that these time slots are idle, do not do any distribution, then from a new frame, sequentially new round distribution is carried out, and this process that circulates.
4. a kind of broadband wireless MANET mac-layer protocol method based on TDMA according to claim 1, it is characterized in that: in step 1, described center control nodes is the arbitrary node in network; Because node each in network safeguards the topology information of the whole network, so arbitrary node can as center control nodes in network.
5. a kind of broadband wireless MANET mac-layer protocol method based on TDMA according to claim 1, it is characterized in that: in step 3, each node is monitored channel at oneself control slot non-, be specially, each node judges packet rs destination address, if packet rs destination address is oneself or broadcasts, then receive this packet, otherwise abandon.
6. a kind of broadband wireless MANET mac-layer protocol method based on TDMA according to claim 1, is characterized in that: in step 4, and slot allocation method adopts the sequence vertex coloring algorithm improved, and specifically comprises:
Step 41: node each in network is carried out sort descending according to a hop neighbor and two-hop neighbor node sum;
Step 42: check whether m time slot can distribute to i-th node;
Step 43: until all node-colorings are complete, first stage painted end;
Step 44: node each in network is carried out sort ascending according to a hop neighbor and two-hop neighbor node sum, after sequence, if there is the node that a hop neighbor is identical with two-hop neighbor node sum, then the order that the node of same population successively decreases according to a hop neighbor sum is resequenced;
Step 45: again check whether m time slot can distribute to i-th node;
Step 46: until all node traverses are complete, the painted end of second stage;
Step 47: the time slot allocation result obtained by said method can be occupied sort descending successively by how many nodes according to time slot;
Step 48: adopt the mode of circulation to carry out the filling of business time-slot, until fill up.
7. a kind of broadband wireless MANET mac-layer protocol method based on TDMA according to claim 6, it is characterized in that: whether m the time slot of the inspection in described step 42 can distribute to i-th node, its based on double bounce interior nodes can not the principle of same color, the principle that namely double bounce interior nodes can not take identical time slot checks.
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