CN106658731A - Resource scheduling method of wireless MESH network - Google Patents
Resource scheduling method of wireless MESH network Download PDFInfo
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- CN106658731A CN106658731A CN201611183691.9A CN201611183691A CN106658731A CN 106658731 A CN106658731 A CN 106658731A CN 201611183691 A CN201611183691 A CN 201611183691A CN 106658731 A CN106658731 A CN 106658731A
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
-
- 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
Abstract
The invention discloses a resource scheduling method of a wireless MESH network. The problem that a node in the prior art cannot rapidly and stably occupy the time slot is mainly solved. The technical scheme is as follows: 1) a basic frame structure of an IEEE802.16Mesh network MAC layer is modified to obtain a new frame structure, and then address serial numbers of all nodes are obtained from time slot serial numbers in the new frame structure; 2) an access node randomly distributes an address serial number for itself, and selects an initial support node to access into the network to acquire the address serial number of itself; 3) the access node schedules the network configuration time slot and the user equipment time slot on the basis of the distributed address serial number to avoid the confliction with other nodes; 4) the access node optimizes the address serial number scheduling according to itself service data size so as to realize the occupancy of the owner-less user equipment time slot UE. By use of the method disclosed by the invention, the time slot can be rapidly and stably occupied, and the method can be used for the data transmission of the wireless MESH network.
Description
Technical field
The invention belongs to communication technical field, further relates to a kind of resource regulating method, can be used for Wireless MESH net
Network, it is ensured that substantial amounts of business datum transmission.
Background technology
Mesh topological networks are a kind of network of employing multiple spot to multidrop topology structure, IEEE802.16 protocol definitions
Two kinds of scheduling modes of Mesh topological networks：Centralized scheduling and distributed scheduling.
Centralized scheduling excessively relies on Mesh network BS root node because of it, and after base station is broken down, whole network will
The state for paralysing, so using less.
Distributed scheduling can be divided into collaborative distributed dispatching and miscoordination distributed scheduling again.Miscoordination distributed scheduling
Scheduling message be only intended to need send data node between set up request and response, without with other node consult,
In being generally used for the fast dispatch stricter to time requirement.And the scheduling message of collaborative distributed dispatching is needed to neighbouring section
Point broadcast, and to consult with the whole network, transmission opportunity is obtained, to ensure that and other node between collision will not be sent.The collaboration point
Although cloth scheduling can realize the dynamic reservation to sending time slots, the conflict produced due to competition is prevented effectively from.It but is directed to
Sea level communication environment, will not be too many in the quantity of node, in the case of communication channel is metastable, the main task of MAC layer
It is the substantial amounts of business datum of transmission, needs the occupancy time interval resource of fast and stable, if using IEEE802.16Mesh network MACs
The collaborative distributed dispatching algorithm of layer, needs exist for the time slot of fixed Schedule Control sub-frame, Schedule Control sub-frame in frame structure
It is accomplished by including the schedule information of the transmission time slot next time to dispatching control message and occupancy data in the message of middle broadcast
The schedule information of frame slot, while the also impact of the operand that dispatching algorithm is brought, generally, it is impossible to realize that node is fast
The stable occupancy time interval resource of speed, the management message of node and the transmission of business datum cannot be ensured.
The content of the invention
Present invention aims to above-mentioned the deficiencies in the prior art, propose a kind of scheduling of resource of Wireless MESH network
Method, to realize the occupancy time interval resource of node fast and stable, ensures the management message of node and the normal transmission of business datum.
The technical thought of the present invention is, by being improved to basic frame structure, to make node direct to the occupancy of time slot
The address number obtained based on node distribution.Its implementation includes as follows：
(1) IEEE802.16Mesh frame structures are optimized：
The frequency and position occurred to time slot in the Mesh network frame structure of IEEE802.16 standards is modified, and removes
The scheduling subframe part of control subframe a so that frame after change in frame structure only includes Network Control sub-frame a Cn and M1
Individual data burst D, wherein, containing a network insertion time slot NENT and M2 network configuration time slot in Network Control sub-frame Cn
NCFG, contains M2 user equipment time slot UE, wherein 1 in data burst D<M1,1<M2<255；
(2) network access node selects respectively initial support node to obtain address number Node ID by the following two kinds situation：
For there is initial support node situation set in advance in network, network access node is waited always after powering and searched for
The network configuration message that initial support node sends, sends networking and asks and obtain address number Node ID to it；
For in network without initial support node situation set in advance, according to comparing network access node and neighbors address
The size of numbering obtains initial support node, and network access node sends networking and asks and obtain address number Node ID to it；
(3) network access node is using the scheduling based on address number Node ID：
(3a) for network insertion time slot NENT, the new node of the addition MESH network that makes a stab sends in this time slot and disappears
Breath, and the time slot is taken by competitive way；
(3b) for M2 network configuration time slot NCFG, network access node is accounted for according to the value of its address number Node ID
With, and send the network of oneself when network configuration time slot NCFG corresponding with the value of node address numbering Node ID arrives
Configuration message；
(3c) for M1 data burst, each data burst has a M2 user equipment time slot UE, network access node according to
The value of its address number Node ID is taken, and in user equipment corresponding with the value of node address numbering Node ID
Gap UE sends the data of oneself when arriving；
(4) data burst timeslot scheduling is optimized：
(4a1) the user equipment time slot UE shared by node present in network primary user device time slot has been defined as into
UE；The user equipment time slot UE being not allocated to corresponding to the numbering Node ID of address of node is defined as without primary user device
Time slot UE；
(4a2) to taking without primary user device time slot UE：Network access node first according to the business datum flow of itself, with
And to all cognitions without primary user device time slot UE in Mesh network, initiate to the occupancy sound without primary user device time slot UE
It is bright；Jump neighbors from all the one of network access node again and send message to the network access node, to respond statement is taken；It is last by networking
Node sends and confirms message.
The present invention has compared with prior art advantages below：
First, because the present invention is modified to IEEE802.16Mesh frame structures so that more time slots are used to transmit
Business datum, reduce the interaction of the management message between node, it is to avoid complicated dispatching algorithm operand.
Second, because the present invention is using the dispatching method based on address number Node ID, overcome user in prior art
Problem to resource contention situation so that the present invention has the advantages that to reduce node time delay.
3rd, because the present invention based on address number Node ID scheduling to being optimized so that the present invention has basis
Different business amount demand dynamic allocation of resources, realizes the effect that fast and stable takes time slot.
Description of the drawings
Fig. 1 is the flowchart of the present invention；
Fig. 2 is the frame assumption diagram in the present invention；
Fig. 3 is the control subframe structure figure in the present invention；
Fig. 4 is the data burst structure chart in the present invention；
Specific embodiment
Below in conjunction with the accompanying drawings the present invention will be further described.
With reference to Fig. 1, the present invention's realizes that step is as follows：
Step 1, is improved to IEEE802.16Mesh network MAC layer frame structures.
In IEEE802.16Mesh topological networks, MAC layer frame structure adopts tdd mode.In the time domain, a frame is divided into control
System frame and data burst two parts.Control subframe is divided into Network Control sub-frame and Schedule Control sub-frame, wherein network control again
Subframe includes network insertion time slot and network configuration time slot again.Calculated using the basic scheduling of IEEE802.16Mesh network MAC layers
Method, needs exist for the time slot of fixed Schedule Control sub-frame in frame structure, while the message broadcasted in Network Control sub-frame is just needed
Including the schedule information of the transmission time slot next time to Internet control message, just need in the message broadcasted in Schedule Control sub-frame
The schedule information of schedule information and occupancy data burst time slot including the transmission time slot next time to dispatching control message, together
When also have impact of the operand that dispatching algorithm is brought to system, it is impossible to realize each node fast and stable occupancy time slot money
Source, the management message of node and the transmission time slot of business datum cannot be ensured, it is therefore desirable to which the frame structure is improved simultaneously
Propose corresponding scheduling.
It is the frequency and position occurred to wherein time slot that the present invention is improved the Mesh network frame structure of IEEE802.16 standards
Put and be modified, and remove Schedule Control sub-frame, when node needs to send scheduling of resource control message, scheduling of resource control
It is transmitted in the basic rate subgroup that message is placed in data burst.
With reference to Fig. 2, a frame structure after the present invention is changed only includes a control subframe and M1 data burst wherein 1
<M1。
With reference to Fig. 3, in frame structure control subframe, i.e. a Cn subframes, the scheduling control in original control subframe is eliminated
System frame, only remains Network Control sub-frame.When the Network Control sub-frame includes two kinds of time slot, respectively network insertion
Gap NENT and M2 network configuration time slot NCFG, 1<M2<255, wherein：
The network insertion time slot NENT, refers to the time slot of the new node transmission message for adding Mesh network that makes a stab；
The M2 network configuration time slot NCFG, referring to carries out the time slot of information exchange transmission between adjacent node；
Referring to the drawings 4, each data burst of frame structure of the present invention includes M2 user equipment time slot UE, during user equipment
Gap UE includes data burst targeting sequencing, and data burst load and data transfer protect three parts, wherein：
Data burst load, including two kinds of basic rate subgroup and variable bit rate subgroup, the basic rate subgroup
Include two parts again：Part I is used to refer to the coding and modulation methods of the variable bit rate subgroup in user equipment time slot UE
Formula, Part II is the load of basic rate subgroup, and wherein the payload segment of basic rate subgroup is used for carrying scheduling letter
Breath and short data message, this example ACK message of business datum is used as short data message；Variable bit rate subgroup master
If for carrying the father of node business datum to be sent.
Step 2, selects initial support node to network and obtains address number Node ID.
Network access node is oneself to be randomly assigned an address number Node ID after 2a) starting shooting, and with the address number
Network configuration message is sent in the corresponding network configuration time slot NCFG of Node ID, is all persistently monitored from other in other times
The network configuration message of node, wherein address number Node ID, refer to control subframe M2 network configuration time slot NCFG with
And numberings of the M2 user equipment time slot UE of data burst from 1 to M2, obtain certainly for new each node for networking can distribute
Oneself is unique address number Node ID, equivalent to the IP address of internet；
2b) identical neighbors domain is occurred in when network access node has listened to multiple nodes, then selected from multiple nodes
Used as initial support node, other nodes to the node initiates the request that networks to one node, and its selection is divided into following two situations：
The first is：When there is initial support node set in advance in network, network access node after powering
The straight network configuration message for waiting and searching for initial support node to send, networks and obtains address volume after the message is received to it
Number Node ID；
It is for second：In the case of in network without initial support node set in advance, when network access node is received
After the network configuration message of other nodes, network access node first determines whether whether Correspondent Node is a node in net：
In this way, then initiate to network to other side and apply；
It is such as non-, then compare the address number Node ID of itself and other side, select the little nodes of address number Node ID to make
For initial support node, other nodes are initiated networking and apply for and obtain address number Node ID to the initial support node, if
Both sides address number Node ID are identical, then wait until to compare again after next frame cyclomorphosis its own address number Node ID.
The initial support node, refers to as a node for setting up Wireless MESH network root node.
Step 3, network access node is using the scheduling based on address number Node ID.
Frame structure and node based on the present invention distributes the address number Node ID for obtaining after networking, in such a way
Message and data are scheduled：
3a) for network insertion time slot NENT, make a stab and add the new node of Mesh network to send net in this time slot
Network accesses message, is competitive mode to the occupancy of the time slot, that is, refer to there are multiple sections that network when network insertion time slot NENT arrives
Point is applied networking simultaneously, then all network access nodes avoid at random some frame periods, and apply networking again, when network insertion
Only one of which network access node application when gap NENT arrives networks, and just network insertion time slot NENT is distributed to into the network access node；
3b) for network configuration time slot NCFG, using the scheduling mode based on address number Node ID, account in net node
Send network configuration message with the corresponding transmission time slots of address number Node ID for obtaining, this network configuration time slot NCFG by
Net node uniquely takes, and other nodes for the allocated network configuration time slot NCFG cannot take, to ensure network in
Node will not be clashed；
3c) for the user equipment time slot UE of data burst, network access node is carried out according to the value of its address number Node ID
Take, and the data of oneself sent when user equipment time slot UE corresponding with the value of node address numbering Node ID arrives,
Because a node takes a time slot, will not clash with other node, reduce node time delay.
With reference to Fig. 2, it is assumed that there is 21 nodes in network, i.e. M2 is 21, this 21 node corresponding data subframes in network
In 21 user equipment time slot UE, each node takes a time slot, takes the numbering and each node distribution of time slot
The address number Node ID correspondences for arriving, such as the address number Node ID values when the user equipment time slot UE that numbering is 2 arrives
Node for 2 can just send business datum, as shown in table 1.
Table 1 is taken based on the user equipment time slot UE of address number Node ID scheduling
In table 1, address number Node ID are that the data for sending 8 frames each frame period of 2 node are less than or equal to variable bit rate
Subgroup, frame number chain team of chain team frame number is always 8 and illustrates that node need not take other users equipment time slot UE, then node is being compiled
Number for 2 frame in take the data burst that numbering is 10,11,12,13 numbering be 2 user equipment time slot UE, and node exists
Numbering is the user equipment time slot UE that the numbering that 3 frame in takes the data burst that numbering is 1,2,3,4 is 2, it is shown that node
Data are sent in the case where sending without mass data according to the corresponding user equipment time slot UE of address number Node ID.
Step 4, is optimized to data burst timeslot scheduling.
It is less and need not send the feelings of a large number of services data in net node that the scheduling of above-mentioned steps 3 is suitable only for network node
Condition, when node needs to send substantial amounts of business datum, and the user equipment time slot UE taken in net node cannot complete data and pass
When defeated, the user equipment time slot UE that can not taken with application node can be in the user equipment time slot if applying successfully
UE sends the business datum of oneself, i.e., data burst timeslot scheduling is optimized as follows：
(4a) to having primary user device time slot UE and being defined without primary user device time slot UE：
User equipment time slot UE shared by node present in network primary user device time slot UE has been defined as into；
The user equipment time slot UE being not allocated to corresponding to the numbering Node ID of address of node is defined as without primary user
Equipment time slot UE；
(4b) to carrying out occupancy statement without primary user device time slot UE：
The first step：Network access node according to the business datum flow of itself, and before to all without primary in Mesh network
The cognition of family equipment time slot UE, initiates the statement of the occupancy without primary user device time slot UE to dereliction, and the statement adopts scheduling controlling
Message is carrying；
Second step：All the one of network access node jump neighbors and take statement to the network access node response, that is to say, that to certain
Whether the individual occupancy statement without primary user device time slot UE is jumped neighbors to determine by acceptance by one, and one jumps neighbors
Receive or refusal is determined come comprehensive according to the occupancy statement of its all jump neighbors for being received：
Statement is taken for conflicting, the neighbors is arbitrated according to the priority of declaration node, i.e. address number
Node ID little declaration node has higher priority, preferentially meets with a response；
State for priority identical takes, then responded using random function；
3rd step：Network access node sends scheduling controlling and confirms message.
The optimization of above-mentioned steps 4 can be further illustrated by table 2：
Table 2 is taken based on address number Node ID Optimized Operation user equipment time slots UE
In table 2, address number Node ID are the data for sending 16 frames each frame period of 2 node more than variable bit rate
Packet, frame number chain team of chain team frame number is increasing always i.e. explanation node cannot complete data in the user equipment time slot UE of distribution
Transmission need to take other without primary user device time slot UE, then it is 10,11,12,13 that node takes numbering in the frame in that numbering is 2
Data burst numbering be 2 user equipment time slot UE and apply to numbering be 20 accounting for without primary user device time slot UE
With, and node is when the numbering that the frame in that numbering is 3 takes the data burst that numbering is 1,2,3,4 is 2 and 20 user equipment
Gap UE, it is shown that node is to the occupancy without primary user device time slot UE in the case where mass data sends.
Above description is only that example of the present invention does not constitute any limitation of the invention, it is clear that for ability
For the professional in domain, after present invention and principle has been understood, all may without departing from the principles of the invention,
Various amendments and the change in form and details, but these amendments and change based on inventive concept are carried out still in the present invention
Claims within.
Claims (6)
1. the resource regulating method of Wireless MESH network, comprises the steps：
(1) IEEE802.16Mesh frame structures are optimized：
The frequency and position occurred to time slot in the Mesh network frame structure of IEEE802.16 standards is modified, and removes control
The scheduling subframe part of subframe a so that superframe after change in frame structure only includes Network Control sub-frame a Cn and M1
Data burst D, wherein, containing a network insertion time slot NENT and M2 network configuration time slot in Network Control sub-frame Cn
NCFG, contains M2 user equipment time slot UE, wherein 1 in data burst D<M1,1<M2<255；
(2) network access node selects respectively initial support node to obtain address number Node ID by the following two kinds situation：
For there is initial support node situation set in advance in network, network access node is waited always after powering and searches for initial
The network configuration message that support node sends, sends networking and asks and obtain address number Node ID to it；
For in network without initial support node situation set in advance, according to comparing network access node and neighbors address number
Size obtain initial support node, network access node sends networking and asks and obtain address number Node ID to it；
(3) network access node is using the scheduling based on address number Node ID：
(3a) for network insertion time slot NENT, make a stab and add the new node of MESH network to send message in this time slot,
And the time slot is taken by competitive way；
(3b) for M2 network configuration time slot NCFG, network access node is taken according to the value of its address number Node ID, and
The network configuration of oneself is sent when network configuration time slot NCFG corresponding with the value of node address numbering Node ID arrives to disappear
Breath；
(3c) for M1 data burst, each data burst has M2 user equipment time slot UE, and network access node is according to its ground
The value of location numbering Node ID is taken, and in user equipment time slot UE corresponding with the value of node address numbering Node ID
The data of oneself are sent during arrival；
(4) data burst timeslot scheduling is optimized：
(4a) the user equipment time slot UE shared by node present in network primary user device time slot UE has been defined as into；Will not
It is assigned to the user equipment time slot UE corresponding to the numbering Node ID of address of node to be defined as without primary user device time slot UE；
(4b) to taking without primary user device time slot UE：Network access node is first according to the business datum flow of itself and right
All cognitions without primary user device time slot UE in Mesh network, initiate to state the occupancy without primary user device time slot UE；Again
Neighbors being jumped from all the one of network access node and sending message to the network access node, to respond statement is taken；Finally by network access node
Send and confirm message.
2. method according to claim 1, wherein the initial support node in step (1), refer to wireless as setting up
One node of MESH network root node.
3., according to the method described in claim 1, the address number Node ID wherein in step (2) refer to the M2 to controlling subframe
Numberings of the M2 user equipment time slot UE of individual network configuration time slot NCFG and data burst from 1 to M2, for new networking
Each node can distribute and obtain oneself unique address number Node ID, equivalent to the IP address of internet.
4., according to the method described in claim 1, wherein in step (3a) network insertion time slot NENT is carried out by competitive way
Take, refer to have multiple network access nodes when network insertion time slot NENT arrives and meanwhile apply networking, then all network access nodes with
Machine avoids some frame periods, and applies networking again, only one of which network access node Shen when network insertion time slot NENT arrives
Please network, just network insertion time slot NENT be distributed to into the network access node.
5. according to the method described in claim 1, value of the network access node wherein in step (3b) according to its address number Node ID
Taken, referred to that each network access node takes a network configuration time slot NCFG, and taken the numbering and node point of time slot
It is identical with the address number Node ID values for obtaining.
6. according to the method described in claim 1, value of the network access node wherein in step (3c) according to its address number Node ID
Taken, refer to that each node takes a user equipment time slot UE, and take the numbering and the node distribution of time slot and arrive
Address number Node ID values it is identical.
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| Publication number | Publication date |
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| CN106658731B (en) | 2019-12-24 |
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