CN102547876A - System and method for reserving wireless mesh network channel resources with no interference to surrounding nodal points - Google Patents
System and method for reserving wireless mesh network channel resources with no interference to surrounding nodal points Download PDFInfo
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Abstract
The invention relates to a system and a method for reserving wireless mesh network channel resources with no interference to surrounding nodal points. The method comprises the steps: (1) a source node sends remote transmission request (RTR) towards the destination node path direction in a common signal channel; (2) a middle node receives RTR of a previous hop node and then judges whether the reservation can be established or not, if the reservation can be performed, an acknowledgement character (ACK) is returned to the previous hop node in the common signal channel and simultaneously reserved radio frequency is switched to a reserved signal channel, then a destination node is judged, if the destination node is confirmed, the step (3) is performed, if not, the RTR is transmitted to a next hop node in the common signal channel and the step (2) is performed. If the reservation cannot be established, negative acknowledge (NAK) is returned to the previous hop node, the previous hop node receives the NAK, then sends noise temperature ratio (NTR) towards the source node direction and releases the reserved signal channel hop by hop, and the reservation establishing fails; (3) the destination node sends click through rate (CTR) towards the source node direction through the reserved signal channel. The middle node on the path receives and transmits the CTR, a final source node receives the CTR, and the reservation establishing work is finished.
Description
Technical field
The invention belongs to communication technical field, particularly relate to a kind of the system and method for the glitch-free wireless mesh network channel resource reservation of node on every side.
Background technology
Wireless mesh network (being called wireless Mesh netword again) is that to have merged mobile Ad hoc network be the network of characteristic with what the infrastructure network structure was arranged with the wireless multi-hop relaying.Wireless mesh network is similar with mobile Ad hoc network on network topology, but the most of nodes of network are in static or weak mobile status, and change in topology is less; The difference of business model is the maximum difference of wireless mesh network and mobile Ad hoc network; What move the Ad hoc network carrying is the Business Stream between any a pair of node; And wireless mesh network mainly carries the business that commutes the Internet gateway, carries the Business Stream between any a pair of node on a small quantity.Wireless mesh network has special advantages at aspects such as broadband access, the raising network coverage, low-cost structures, is considered to the wireless version of next generation Internet, also is considered to one of potential technology that makes up B3G/4G.
Resource reservation is the key technology that effectively ensures network QoS.Because the opening of radio transmission is brought the air interference that can not eliminate; The crossover channel quantity is unlimited mutually simultaneously; Generally believe with the wireless multi-hop to be that the network of characteristic is difficult to bear the consumption of traditional resource reservation protocol (RSVP) to its limited channel resource, it is a research difficult problem that comprises the wireless multi-hop network of wireless mesh network that channel resource is reserved always.
Channel resource is reserved and is regarded as usually at the node radio frequency interface reserving the service time of channel.Correlative study is few in wireless mesh network and the mobile ad hoc network, mainly contains following three kinds of implementation methods at present.
What 1. adopt among the MACA/PR is the method for obligating that continues in real time.At first adopting RTS/CTS is that first packet is made reservation along the path that it passes through, and all comprises next packet transmitting time in the packet of each transmission then so that inform interdependent node and upgrades reservation.Future mechanism requires smallest synchronization among the MACA/PR, and each node is set up a reservation table and needed frequent reservation table mutual in the network, and the flexibility of reservation is less and reduce the communication efficiency of localized network easily.
Slot reservation when 2. INSIGNIA in-band signalling system carries out respectively each jumping in the path earlier adopts the soft state method for managing resource with adaptation function to respond slot reservation when forming end to end fast then.Though, but the self adaptation service can become effectively that the time spent becomes maximum from the minimum bandwidth guarantee at Internet resources among the INSIGNIA, and the flexibility of reservation is good, needs complicated self adaptation calculating and frequent in-band signalling mutual.
3. artificial wireless mesh network such as Carlson propose distributed end-to-end the time slot reservation (DARE; Distributed end-to-end Allocation of time slots for Real-time traffic) agreement is earlier with reservation requests (RTR; Request-to-Reserve) notify on the way node set aside some time fragment and slot cycle, respective nodes is periodically used the time slice of reservation then.The shortcoming of DARE is strict Network Synchronization, and mixes use with DARE based on the DCF mechanism of conflict and be difficult to produce a desired effect.
The main cause that the traditional resource method for obligating is difficult to use in wireless multi-hop network is in order to prevent that transfer of data in the reserved path from receiving hindering and damaging of node on every side and the transfer of data of adjacent node is suppressed, thereby causes network efficiency low.The method for obligating resource that proposes in recent years is strict Network Synchronization usually, and this is difficult to realize for fairly large wireless multi-hop network.Existing resource is reserved two deficiencies of research ubiquity, and one is that the consideration to channel disturbance is abundant not enough in the simulating, verifying environment, and another is the advantage that does not make full use of a plurality of channel resources.
People such as Yan Junrong present the characteristics that tree topology converges according to the wireless mesh network flow and propose Radio Link interference analysis model in data link layer, are converted into omnidirectional air interference the Radio Link interference of specific direction.Like Fig. 1 signal, node S is the root node that links to each other with Internet in typical wireless mesh network backbone network topology, and Network flows to node S and converges.For ease of expression, suppose that dotted line length is single-hop largest data transfer distance R t just between adjacent two nodes.Under same channel, suppose that wherein arbitrary node is communicated by letter with L to G, i.e. link GL busy channel, the link around this moment are interfered and busy channel again.But it but is different disturbing the consequence that different links are caused, and can be categorized as interference vertical interference and laterally disturb thus.Vertically disturb when being meant link GL busy channel, a jumping link (CG, DG, DH, HE etc.) on it and next are jumped the interference that link (KP, KQ, LQ, LR etc.) causes, can be described as multi-hop again and disturb.Laterally disturb when being meant link GL busy channel,, can be described as single-hop again and disturb the interference that link in parallel (FK, GK, HL, HM etc.) causes.Vertically (multi-hop) disturbs and can regard interference in the same Business Stream as, and laterally (single-hop) interference then is parallel interference between different business stream.Adopt OPNET emulation can verify that vertical interference ratio laterally disturbs much bigger to the network performance influence, vertically disturbing is serious disturbance in the wireless mesh network.
On this basis, as smallest partition unit the topology of wireless network shape net is cut apart, illustrated like Fig. 2 with the single-hop in the multi-hop link.So the path that needs resource reservation in the wireless mesh network is the curved section that passes through topological subgraph along its vertical interference radiating way hop-by-hop.Thus, can be converted into how to be the problem of the interim allocated channel of this curved section to channel resource reservation problem.
Summary of the invention
Technical problem to be solved by this invention is on the basis of Radio Link interference model and network topology segmentation strategy, to provide a kind of to the system and method for the glitch-free wireless mesh network channel resource reservation of node on every side.
The present invention takes following technical scheme: to the system of the glitch-free wireless mesh network channel resource reservation of node on every side, it comprises generation and sending module, reservation forwarding module, reserves receiver module.
Generate and sending module: be used for the Controlling Source node and send reservation request RTR to the next-hop node of destination node path direction at common signal channel; The message of reservation request comprises that channel, the estimation that can reserve take the duration of channel reservation, the NAV value of this RTR message, the address of destination node.
Reserve forwarding module: after the intermediate node of reserved path to receive the RTR message of a hop node; Divide two kinds of situations to handle: a kind of is to reply reservation request, and then this node increases a record in its reservation table, and is made as " tentatively " to this recording status; Then return the ACK acknowledge message to the node that sends RTR message at common signal channel; Switch to channel reservation reserving radio frequency interface simultaneously, and then transmit RTR message to next-hop node, until destination node; Another kind is to reply reservation request; Then this node is no longer transmitted RTR message; Deny message but return NAK to the node that sends RTR message at common signal channel; Receive that channel hop node (oppositely) on it that the node utilization of NAK has been reserved sends negative reservation NTR information, this NTR information is returned source node, deletes the record in the node reservation table on the way simultaneously.
Reserve receiver module: after destination node is received RTR, in its reservation table, increase a record and be made as " preparation " to this recording status; Switch to channel reservation reserving radio frequency interface, produce one simultaneously and permit reserving CTR message, and transmit CTR along reverse reserved path; CTR message is received and transmitted to intermediate node on the way, changes recording status into " preparation " by " tentatively "; At last, source node is received CTR message, sets up the work of reserving this moment and accomplishes.
The present invention is to the glitch-free wireless mesh network channel resource of node method for obligating on every side, its as follows:
1. source node next-hop node to the destination node path direction in common signal channel sends reservation request; Comprise in the RTR message that channel, the estimation that can reserve take the duration of channel reservation, the NAV value of this RTR message and the information such as address of destination node;
2. after intermediate node was received the RTR of a hop node, can judgement be reserved.If can set up reservation, then common signal channel upwards a hop node return ACK, reserve radio frequency simultaneously and switch to channel reservation; And then transmit RTR to next-hop node at common signal channel, judge whether it is destination node again, if; Then got into for the 3. step, if not, then returned for the 2. step.If can not set up reservation, then upwards a hop node returns NAK, and a last hop node is eliminated the node of channel reservation to source node transmission NTR after receiving NAK, reserves failure.
3. common signal channel upwards a hop node return ACK, reserve radio frequency and switch to channel reservation, through channel reservation to direction of origin (oppositely) transmission CTR; CTR message is received and transmitted to intermediate node on the way, and last source node is received CTR message, sets up the work of reserving this moment and accomplish.
Reserve the interference of node on every side in order to eliminate channel resource, the simplest method is exactly to distribute and pass through channel different in the topological subgraph to this paths.In order to practice thrift channel, need that end to end link can only distribute a channel in the path of resource reservation.That is to say, through give in the reserved path one of all link assignment and node on every side not the channel of crossover realize resource reservation.
The most important thing is to set up the method for resource reservation in the resource reservation system.The method that the present invention adopts is that interdependent node is competed the channel reservation right to use on common signal channel, and corresponding then radio frequency interface switches to and realizes glitch-free transfer of data on the channel reservation.The method can solve the severe local that exists in the existing resource method for obligating effectively and reduce network transmission efficiency or strict problems such as network time synchronization.
Therefore, with respect to existing wireless mesh network resource reservation implementation method, the channel resource method for obligating that the present invention proposes has three big advantages:
(1) adopt common signal channel competition channel reservation and the noiseless transmission data of channel reservation to combine, the flexibility of resource reservation is big.
(2) do not need strict Network Synchronization, be easy to realize.
(3) common signal channel and channel reservation do not have crossover on frequency, and resource reservation node and adjacent node do not disturb mutually, can not cause network performance to reduce.
Description of drawings
Fig. 1 is wireless mesh network link interference model (vertically disturb and laterally disturb) figure.
Fig. 2 is the path sketch map that needs channel reservation after wireless mesh network topology is cut apart.
Fig. 3 successfully sets up the reservation sketch map.
Fig. 4 does not successfully set up the reservation sketch map.
Fig. 5 is that the wireless mesh network channel resource is reserved flow chart.
Fig. 6 is that the wireless mesh network channel resource is reserved system block diagram.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, embodiments of the invention are described in detail below in conjunction with accompanying drawing.
As shown in Figure 2, in order to guarantee the connection of network, each node has 2 radio frequency interfaces at least, belongs to two adjacent topological subgraphs respectively, and the neighborhood subgraph distributes different channels.The residing channel of all radio frequency interfaces is called common signal channel in the topological subgraph.In order to guarantee to realize that channel resource can not influence the connectedness of network when reserving, needing increases a radio frequency interface, is used to set up the transfer of data after the reservation.
Be described in detail the process of setting up below to the glitch-free wireless mesh network channel resource reservation of node on every side.
Setting up reservation is to the time resource of the intermediate node channel reservation in path between source node and the destination node, is initiated by source node usually.Setting up the principle of reserving is the competition channel reservation right to use on common signal channel, and corresponding then radio frequency interface switches to the enterprising data transfer of channel reservation, illustrates like Fig. 3.
Concrete execution in step is following:
1. source node is at first initiated resource reservation request at common signal channel.Source node sends a reservation request (RTR to the destination node path direction; Request-to-Reserve) message comprises in the RTR message that wherein channel, the estimation that can reserve take the duration of channel reservation, the NAV value of this RTR message and the information such as address of destination node.So RTR message node transmission one by one along the path that will set up reservation.Be simple and clear signal, 3 intermediate nodes (A, B, C) only draw among Fig. 3.
2. after wanting the intermediate node of reserved path to receive the RTR message of a hop node, divide two kinds of situations to handle.A kind of is to reply reservation request; As shown in Figure 3, then this node increases a record in its reservation table, and is made as " tentatively " to this recording status; Then return the ACK acknowledge message to the node that sends RTR message at common signal channel; Switch to channel reservation reserving radio frequency interface simultaneously, and then transmit RTR message to next-hop node, until destination node; Another kind is to reply reservation request; As shown in Figure 4, then this node is no longer transmitted RTR message, denies message but return NAK at common signal channel to the node that sends RTR message; Receive that channel hop node (oppositely) on it that the node utilization of NAK has been reserved sends negative reservation (NTR; Negative Reservation) information, this NTR information is returned source node, deletes the record in the node reservation table on the way simultaneously.
3. after destination node is received RTR, in its reservation table, increase a record and be made as " preparation " to this recording status.Switch to channel reservation reserving radio frequency interface, (CTR, Clear-to-Reserve) message wherein comprise the channel reservation information that consults, and transmit CTR along reverse reserved path to produce an allowance reservation simultaneously.CTR message is received and transmitted to intermediate node on the way, changes recording status into " preparation " by " tentatively ".At last, source node is received CTR message, sets up the work of reserving this moment and accomplishes.
Above implementation method can use flow chart (Fig. 5) to illustrate.
Reserve in case set up, the reservation radio frequency interface of source node can be immediately to the destination node transmitting real-time data after switching to channel reservation.Clearly; The radio frequency interface of respective nodes all switches to channel reservation in the whole reserved path; A plurality of common signal channels of channel reservation and all topological subgraphs all do not have the frequency crossover, therefore can not disturb common signal channel at the channel reservation transmitting data, can not receive the interference of common signal channel yet.In order to save channel reservation, the radio frequency interface of respective nodes all switches to same channel reservation in the reserved path, thereby can design data rapid transmission method in a kind of single channel serial multihop path.
The invention also discloses and a kind of the glitch-free wireless mesh network channel resource of node is on every side reserved system, comprise generation and sending module, reservation forwarding module, reserve receiver module, referring to Fig. 6.
Generate and sending module: be used for the Controlling Source node and send reservation request RTR to the next-hop node of destination node path direction at common signal channel;
Reserve forwarding module: receive the RTR message of a last hop node for the intermediate node of wanting reserved path after, divide two kinds of situations to handle.A kind of is to reply reservation request; Then this node increases a record in its reservation table; And be made as " tentatively " to this recording status, and then return the ACK acknowledge message to the node that sends RTR message at common signal channel, switch to channel reservation reserving radio frequency interface simultaneously; And then transmit RTR message to next-hop node, until destination node; Another kind is to reply reservation request; Then this node is no longer transmitted RTR message; Deny message but return NAK to the node that sends RTR message at common signal channel; Receive that channel hop node (oppositely) on it that the node utilization of NAK has been reserved sends negative reservation NTR information, this NTR information is returned source node, deletes the record in the node reservation table on the way simultaneously.
Reserve receiver module: after destination node is received RTR, in its reservation table, increase a record and be made as " preparation " to this recording status.Switch to channel reservation reserving radio frequency interface, produce one simultaneously and permit reserving CTR message, and transmit CTR along reverse reserved path.CTR message is received and transmitted to intermediate node on the way, changes recording status into " preparation " by " tentatively ".At last, source node is received CTR message, sets up the work of reserving this moment and accomplishes.
Certainly; Those of ordinary skill in the art will be appreciated that above embodiment is used for explaining the present invention, and is not that conduct is to qualification of the present invention; As long as within the scope of the invention, all will drop on protection scope of the present invention to variation, the modification of above embodiment.
Claims (4)
1. to the system of the glitch-free wireless mesh network channel resource reservation of node on every side, it is characterized in that comprising generation and sending module, reservation forwarding module, reserve receiver module;
Generate and sending module: be used for the Controlling Source node and send reservation request RTR message to the next-hop node of destination node path direction at common signal channel;
Reserve forwarding module: receive the RTR message of a last hop node for the intermediate node of wanting reserved path after; Divide two kinds of situations to handle: a kind of is to reply reservation request, and then this node increases a record in its reservation table, and is made as " tentatively " to this recording status; Then return acknowledge message to the node that sends RTR message at common signal channel; Switch to channel reservation reserving radio frequency interface simultaneously, and then transmit RTR message to next-hop node, until destination node; Another kind is to reply reservation request; Then this node is no longer transmitted RTR message; Deny message but return NAK to the node that sends RTR message at common signal channel; Receive that channel hop node on it that the node utilization of NAK message has been reserved sends negative reservation NTR information, this NTR information is returned source node, deletes the record in the node reservation table on the way simultaneously;
Reserve receiver module: after destination node is received RTR message, in its reservation table, increase a record and be made as " preparation " to this recording status; Switch to channel reservation reserving radio frequency interface, produce one simultaneously and permit reserving CTR message, and along reserved path back transfer CTR message; CTR message is received and transmitted to intermediate node on the way, changes recording status into " preparation " by " tentatively "; At last, source node is received CTR message, sets up the work of reserving this moment and accomplishes.
2. as claimed in claim 1 to the system of the glitch-free wireless mesh network channel resource reservation of node on every side, it is characterized in that: the message of reservation request comprises that channel, the estimation that can reserve take the duration of channel reservation, the NAV value of this RTR message, the address of destination node.
3. one kind to the glitch-free wireless mesh network channel resource of node method for obligating on every side, it is characterized in that as follows:
1. source node next-hop node to the destination node path direction in common signal channel sends reservation request RTR message;
2. after intermediate node was received the RTR message of a hop node, can judgement be reserved; If can set up reservation, then common signal channel upwards a hop node return and confirm ACK message, reserve radio frequency simultaneously and switch to channel reservation; And then judge whether it is destination node, if then got into for the 3. step; If not, then transmit RTR message to next-hop node, returned for the 2. step at common signal channel; If can not set up reservation, then upwards a hop node returns and denies NAK message, and a last hop node sends negative reservation NTR notice to the source node direction after receiving NAK message, and hop-by-hop discharges the channel of having reserved, reserves failure;
3. destination node is sent to direction of origin through channel reservation and is permitted reserving CTR message; CTR message is received and transmitted to intermediate node on the way, and the ultimate source node is received CTR message, on channel reservation, realized reservation this moment.
4. as claimed in claim 3 to the glitch-free wireless mesh network channel resource of node method for obligating on every side; It is characterized in that: in the 1. step, comprise the channel that to reserve in the described RTR message, estimate to take the duration of channel reservation, the NAV value of this RTR message and the information such as address of destination node.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105100184A (en) * | 2014-05-19 | 2015-11-25 | 英特尔公司 | Reliable and deterministic live migration of virtual machines |
| CN107113627A (en) * | 2015-01-16 | 2017-08-29 | 瑞典爱立信有限公司 | RSVP for wireless backhaul |
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| CN101155098A (en) * | 2006-09-28 | 2008-04-02 | 华为技术有限公司 | Wireless Mesh and its resource management method |
| US20100284302A1 (en) * | 2009-05-07 | 2010-11-11 | Alcatel-Lucent Canada Inc. | Auto-binding sdp rsvp lsp tunnel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155098A (en) * | 2006-09-28 | 2008-04-02 | 华为技术有限公司 | Wireless Mesh and its resource management method |
| US20100284302A1 (en) * | 2009-05-07 | 2010-11-11 | Alcatel-Lucent Canada Inc. | Auto-binding sdp rsvp lsp tunnel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105100184A (en) * | 2014-05-19 | 2015-11-25 | 英特尔公司 | Reliable and deterministic live migration of virtual machines |
| CN107113627A (en) * | 2015-01-16 | 2017-08-29 | 瑞典爱立信有限公司 | RSVP for wireless backhaul |
| CN107113627B (en) * | 2015-01-16 | 2021-09-03 | 瑞典爱立信有限公司 | Resource reservation protocol for wireless backhaul |
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Effective date of registration: 20160712 Address after: 100101 Beijing City, Chaoyang District Road No. 19 Building, Xiao Ying Yu a room 106 Patentee after: Beijing Rui LAN excellence Polytron Technologies Inc Address before: Hangzhou City, Zhejiang province 310018 Jianggan District Xiasha Higher Education Park No. 2 street Patentee before: Hangzhou Electronic Science and Technology Univ |