CN101977406B - Quick service flow establishing method in wireless MESH network - Google Patents
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Abstract
The invention belongs to the technical field of mobile communication, and discloses a quick service flow establishing method applied in a wireless MESH network. The method comprises the following steps of: classifying the service flow establishing method according to the establishing flow and the establishing speed of service flow, wherein the establishing method comprises slow service flow establishment and quick service flow establishment; aiming at the quick service flow establishment in a process of constructing the service flow, sending MSH-SF-ADD-REQ request message for establishing the service flow by a source node; after an intermediate node receives the MSH-SF-ADD-REQ request message sent by a request node of the service flow, immediately generating MSH-SF-ADD-RSP message and MSH-SF-ADD-REQ message, and adding the MSH-SF-ADD-RSP message and the MSH-SF-ADD-REQ message into DSCH (downlink sharing channel) message for sending; after a next hop node of the link receives the MSH-SF-ADD-REQ message sent by the intermediate node, returning MSH-SF-ADD-RSP message to the intermediate node; and after the source node receives the MSH-SF-ADD-RSP message returned by the intermediate node, returning MSH-SF-ADD-ACK message to the intermediate node; and after the intermediate node receives the MSH-SF-ADD-RSP message returned by the next hop node, returning MSH-SF-ADD-ACK message to the next hop node so as to realize quick establishment of whole service flow.
Description
Technical field
The present invention relates to wireless communication technology field, specifically, the present invention relates to the service flow method for building up in the Wireless MESH network media access control system.
Background technology
In Wireless MESH network, management service flow is the important component part in media access control protocol, is to realize the key technology of QoS security mechanism in the MESH network; Management service flow mainly comprises the refreshing of deletion, service bandwidth of modification, the service flow of foundation, the service flow of service flow, the request of service bandwidth; Generally, a service flow and following association of characteristics: 1) Link ID: end-to-end service stream of unique sign in global scope.2) qos parameter set: this parameter set comprises the characteristics such as type of service, minimax service rate, time delay, shake, transmission policy.
Set up in process in service flow, need to set up the service flow from the source node to the destination node in multi-hop MESH network, and the speed that source node is set up service flow to destination node will directly affect the lifting of entire system performance, therefore, need the service flow Establishing process is simplified and optimized.
Summary of the invention
The purpose of this invention is to provide quick service stream establishing method in a kind of Wireless MESH network.Specifically comprise the following steps:
Steps A: when source node need to send data to destination node, the upper level applications of source node need to be carried out alternately with MAC layer management service flow module;
After step B:MAC layer management service flow module receives that the service flow of upper level applications transmission is set up request, need to resolve and process the DL_QoS_CREATE.request primitive that upper level applications sends, the management service flow module be carried out the MSH_SF_ADD_REQ message generation that service flow is set up;
Step C: after source node MAC layer management service flow module generates service flow control message, carry out between source node and destination node alternately, carry out service flow and set up;
Step D: complete quick service stream and set up process.
In described steps A, the interaction flow between the upper level applications of source node and MAC layer management service flow module is as follows:
Steps A 1: upper level applications sends the DL QoS CREATE.request primitive (this primitive mainly comprises destination node IP address, service flow type and qos parameter etc.) that comprises the QoS of survice parameter to MAC layer management service flow module;
Steps A 2: after the requesting node of service flow receives that the service flow of service flow recipient node reply is set up return information MSH_SF_ADD_RSP, the MAC layer of service flow request node need to send DL_QoS_CREATE.confirmation primitive to upper level applications, and service flow has been successfully established the notice upper strata.
In described step B, after source node MAC layer is received the DL_QoS_CREATE.request primitive of upper level applications transmission, need to resolve the qos parameter in DL_QoS_CREATE.request primitive, if source node can be accepted this qos parameter, with this qos parameter structure MSH_SF_ADD_REQ message, if source node can not be accepted this qos parameter, source node MAC layer sends and to set up the service flow failure information to upper level applications, and informs that upper strata is revised after qos parameter and resend DL_QoS_CREATE.request primitive and carry out the foundation of service flow.
In described step C, detailed interaction flow between source node and destination node in setting up the service flow process comprises the following steps that (comprise A, B, three nodes of C as the example analysis take the whole piece communication link, wherein, A is source node, B is intermediate node, and C is destination node):
Step C1: source node A sends the MSH_SF_ADD_REQ request message of setting up service flow;
Step C2: intermediate node B generates MSH_SF_ADD_RSP message and MSH_SF_ADD_REQ message after receiving the MSH_SF_ADD_REQ request message that the requesting node of service flow sends immediately,
Step C3: MSH_SF_ADD_RSP message and MSH_SF_ADD_REQ message are joined in DSCH message and sends (wherein, MSH_SF_ADD_RSP message replies to the requesting node A of service flow, and MSH_SF_ADD_REQ message sends to the next-hop node C on link);
Step C4: receive the MSH_SF_ADD_REQ message of intermediate node B transmission as the next-hop node C of link after, to intermediate node, reply MSH_SF_ADD_RSP message;
Step C5: after source node A receives the MSH_SF_ADD_RSP message of intermediate node B reply, to intermediate node, reply MSH_SF_ADD_ACK message;
Step C6: after intermediate node B received the MSH_SF_ADD_RSP message of next-hop node C reply, the down hop node was replied MSH_SF_ADD_ACK message.
In addition, in service flow, set up in process, need to complete the maintenance of transaction management information and the management of Link ID, the specific design method is as follows:
(1) service flow set up process in need transaction management information is safeguarded.The operation of service flow each time that source node is initiated is all affairs (comprising the establishment, deletion, change of service flow etc.), and wherein, all affairs form a chained list, and the affairs on same service flow also form a chained list.TransactionID is by the unique distribution of node of initiating affairs, and initiating affairs node NodeID+transaction ID can affairs of unique identification;
(2) when the Dynamic Establishing service flow, the initiation node of service flow is that service flow is distributed unique Link ID, this Link ID=source node NodeID+SeqNum, and wherein Node ID is the source node numbering, SeqNum is random number.
The invention has the beneficial effects as follows: the present invention is quick service stream establishing method in a kind of Wireless MESH network, and purpose is set up speed in raising whole piece service flow, improves the entire system performance.
Description of drawings
Fig. 1 is that service flow is set up the link schematic diagram;
Fig. 2 is upper strata and MAC layer primitives interoperation flow chart;
Fig. 3 is that multinode quick service stream is set up schematic diagram;
Fig. 4 is multinode quick service stream Establishing process figure;
Fig. 5 is that source node A service flow is set up the handling process in process;
Fig. 6 is that intermediate node B service flow is set up the handling process in process;
Fig. 7 is that destination node C service flow is set up the handling process in process.
Embodiment
, in order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, quick service stream establishing method in Wireless MESH network of the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below describe quick service stream establishing method in Wireless MESH network of the present invention in detail.
Before service flow in Wireless MESH network is set up, need to define the whole piece communication link, as shown in Figure 1, in Wireless MESH network, a communication link comprises n+2 node (n 〉=1), one of them node is source node, and a node is destination node, and n node is intermediate node.
Before source node sent data to destination node, the source node upper strata need to be carried out alternately to source node MAC layer management service flow module, and as shown in Figure 2, concrete interaction flow is:
Step 01: upper level applications sends the DL_QoS_CREATE.request primitive (this primitive mainly comprises destination node IP address, service flow type and qos parameter etc.) that comprises the QoS of survice parameter to MAC layer management service flow module;
The DL_QoS_CREATE.request primitive that step 02:MAC layer parse upper layers application program sends;
The qos parameter of step 03:MAC layer by resolving in step S2, judge whether to receive this service flow and set up request,, if can accept this service flow request, enters step 04, otherwise, change step 05 over to;
Step 04:MAC layer management service flow module generates the MSH_SF_ADD_REQ request message, and the Requested Party that sends to service flow to set up, and then enters step 06;
Step 05: source node MAC layer sends and to set up the service flow failure information to upper level applications, and informs that upper strata is revised after qos parameter and resend DL_QoS_CREATE.request primitive and carry out the foundation of service flow, finishes;
Step 06: source node is received the MSH_SF_ADD_RSP information that the requested node of service flow is replied;
Step 07: the MAC layer of service flow request node need to send DL_QoS_CREATE.confirmation primitive to upper level applications, and service flow has been successfully established the notice upper strata, finishes.
Below take a communication link, have 3 nodes to carry out the introduction of quick service stream Establishing process as example, as shown in Figure 3 and Figure 4, the whole piece communication link comprises A, B, three nodes of C, wherein, A is source node, and B is intermediate node, C is destination node, and whole communication link service flow Establishing process is as follows:
Step S1: source node A sends the MSH_SF_ADD_REQ request message of setting up service flow;
Step S2: intermediate node B generates MSH_SF_ADD_RSP message and MSH_SF_ADD_REQ message after receiving the MSH_SF_ADD_REQ request message that the requesting node A of service flow sends immediately;
Step S3: intermediate node B joins MSH_SF_ADD_RSP message and MSH_SF_ADD_REQ message in DSCH message and sends (wherein, MSH_SF_ADD_RSP message replies to the requesting node A of service flow, and MSH_SF_ADD_REQ message sends to the next-hop node C on link);
Step S4: receive the MSH_SF_ADD_REQ message of intermediate node B transmission as the next-hop node C of link after, to intermediate node, reply MSH_SF_ADD_RSP message;
Step S5: after source node A receives the MSH_SF_ADD_RSP message of intermediate node B reply, to intermediate node, reply MSH_SF_ADD_ACK message;
Step S6: after intermediate node B received the MSH_SF_ADD_RSP message of next-hop node C reply, the down hop node was replied MSH_SF_ADD_ACK message;
Step S7: the Establishing process of completing quick service stream.
In addition, in Fig. 3, in figure, t1 represents that destination node sends the time of DSCH_SF_ADD_RSP message to intermediate node, t2 represents that source node sends the time of DSCH_SF_ADD_ACK message to intermediate node, t3 represents that intermediate node sends the time of DSCH_SF_ADD_ACK message to destination node, and during transmission that these times, to be all each node oneself broadcasted by neighbor node, machine information is preengage and obtained.
The foundation of service flow is to realize in management service flow subsystem in the MAC agreement, and the triggering of service flow is to be completed by upper level applications.Below will carry out labor to the constitution and implementation step of service flow between a plurality of nodes:
Below describe respectively source node A, intermediate node B, destination node C and set up handling process in process in service flow:
For source node A, as shown in Figure 5, concrete steps comprise the execution flow process in its service flow Establishing process:
Step SA1: the application program of source node A sends DL_QoS_CREATE.request primitive to the MAC layer;
Qos parameter is resolved and preserved to step SA2:MAC layer to DL_QoS_CREATE.request primitive;
Step SA3: the MAC layer of source node A judges whether this node meets the QoS demand of this service flow,, if meet, enters step SA4, otherwise, change step SA5 over to;
Management service flow subsystem in step SA4:MAC layer protocol generates DSCH_SF_ADD_REQ message according to the qos parameter of preserving, and changes execution step SA6 over to;
Step SA5:MAC layer can be set up service flow the unsuccessful upper level applications of informing, and allows upper level applications revise after qos parameter the foundation that re-starts service flow, re-executes step SA1;
Step SA6: the DSCH_SF_ADD_REQ information that the MAC layer of source node A will generate is added in DSCH message, when DSCH message send opportunity arrives next time by the time, the DSCH information broadcast is gone out, and open simultaneously the T1 timer, wait for the DSCH_SF_ADD_RSP message that intermediate node B replys;
Step SA7: source node A judges whether the DSCH_SF_ADD_RSP message of receiving that intermediate node B replys,, if receive, enters step SA8, otherwise changes step SA11 over to;
Step SA8: this node upwards layer sends DL_QoS_CREATE.confirm primitive, and next-hop node has been accepted the information reporting upper strata that this service flow is set up;
Step SA9: generate DSCH_SF_ADD_ACK message, then reservation sends the chance of DSCH message next time, when transmission arrives opportunity, the DSCH_SF_ADD_ACK message that generates is joined in DSCH message and sends; Service flow is successfully established, and finishes;
Step SA10: source node A judges whether the T1 timer expires, and, if the T1 timer expires, performs step SA11, otherwise changes step SA7 over to;
Step SA11: source node A starts the T3 timer;
Step SA12: source node A judges whether the T3 timer expires, and, if not yet due, waits for that the T3 timer expires, if expire, service flow is set up unsuccessfully, finishes.
For intermediate node B: as shown in Figure 6, concrete steps comprise the execution flow process in its service flow Establishing process:
Step SB1: intermediate node B receives the DSCH_SF_ADD_REQ information that source node A sends;
Step SB2: intermediate node B resolves and judges the qos parameter in the DSCH_SF_ADD_REQ information of receiving source node A transmission, intermediate node B judges whether to accept this qos parameter, if accept, perform step SB3, if Node B can not be accepted this qos parameter, Node B is left intact;
Step SB3: intermediate node B generates DSCH_SF_ADD_RSP message (this IE sends to source node A) and DSCH_SF_ADD_REQ message (this IE sends to destination node C) simultaneously;
Step SB4: Node B send DSCH message next time in two message generating in forwarding step SB5, while opening timing device T1 and T2, wherein, T1 is after intermediate node B sends DSCH_SF_ADD_REQ message to destination node C, wait for the DSCH_SF_ADD_RSP message that destination node C replys, T2 is after intermediate node B sends DSCH_SF_ADD_RSP message to source node A, waits for that reception sources node A replys DSCH_SF_ADD_ACK message;
Step SB5: judge whether the T2 timer expires,, if not yet due, perform step SB6, otherwise, finish intermediate node service flow Establishing process;
Before expiring, receives step SB6:T2 that source node A replys DSCH_SF_ADD_ACK message, finishes the service flow handling process;
Step SB7: judge whether the T1 timer expires,, if not yet due, perform step SB8, otherwise, finish intermediate node service flow Establishing process;
Step SB8: received that before T1 expires destination node C replys DSCH_SF_ADD_RSP message;
Step SB9: after receiving that destination node C replys DSCH_SF_ADD_RSP message, generate DSCH_SF_ADD_ACK message, and in the DSCH message that next time sends, DSCH_SF_ADD_ACK message is sent to destination node C, finish intermediate node service flow handling process.
For destination node C: as shown in Figure 7, concrete steps comprise the execution flow process in its service flow Establishing process:
Step SC1: destination node C receives the DSCH_SF_ADD_REQ message that intermediate node B sends;
Step SC2: destination node C resolves and judges the qos parameter in the DSCH_SF_ADD_REQ information of receiving intermediate node B transmission, destination node C judges whether to accept this qos parameter,, if accept, performs step SC3, otherwise, be left intact;
Step SC3: destination node C generates DSCH_SF_ADD_RSP message, and in the DSCH of the transmission next time message of reservation, DSCH_SF_ADD_RSP message is sent to intermediate node B;
Step SC4: destination node C opening timing device T2, wait for that intermediate node B replys DSCH_SF_ADD_ACK message;
Step SC5: receive the DSCH_SF_ADD_ACK message that intermediate node B replys before T2 expires, finish destination node service flow Establishing process, otherwise, execution step SC6;
Step SC6: judge whether the T2 timer expires,, if expire, finish destination node service flow Establishing process, otherwise, execution step SC5.
By reference to the accompanying drawings to the description of the specific embodiment of the invention, other side of the present invention and feature are apparent to those skilled in the art by above.
Above specific embodiments of the invention are described and illustrate, it is exemplary that these embodiment should be considered to it, and is not used in and limits the invention, and the present invention should make an explanation according to appended claim.
Claims (7)
1. quick service stream establishing method in a Wireless MESH network, is characterized in that, the method comprises the following steps:
Steps A: when source node need to send data to destination node, the upper level applications of source node need to be carried out alternately with the MAC layer management service flow module of this node before data send;
Step B: after source node MAC layer management service flow module received that the service flow of upper level applications transmission is set up request, the management service flow module was carried out the service flow control message generation;
Step C: after source node MAC layer management service flow module generates service flow control message, and destination node carries out alternately, carries out the Establishing process that quick service flows;
Step D: complete quick service stream and set up process.
2., by quick service stream establishing method in a kind of Wireless MESH network claimed in claim 1, it is characterized in that, in described steps A, the interaction flow between the upper level applications of source node and MAC layer management service flow module is as follows:
Steps A 1: upper level applications sends the DL_QoS_CREATE.request primitive that comprises the QoS of survice parameter to MAC layer management service flow module, this primitive comprises destination node IP address, service flow type and qos parameter;
Steps A 2: after the requesting node of service flow receives that the service flow of service flow recipient node reply is set up return information MSH_SF_ADD_RSP, the MAC layer of service flow request node need to send DL_QoS_CREATE.confirmation primitive to upper level applications, and service flow has been successfully established the notice upper strata.
3. by quick service stream establishing method in a kind of Wireless MESH network claimed in claim 1, it is characterized in that, in described step B, after source node MAC layer is received the DL_QoS_CREATE.request primitive of upper level applications transmission, need to resolve the qos parameter in DL_QoS_CREATE.request primitive, if source node can be accepted this qos parameter, with this qos parameter structure MSH_SF_ADD_REQ message, if source node can not be accepted this qos parameter, source node MAC layer sends and sets up the service flow failure information to upper level applications, and inform that upper strata is revised after qos parameter and resend DL_QoS_CREATE.request primitive and carry out the foundation of service flow.
4. by quick service stream establishing method in a kind of Wireless MESH network claimed in claim 1, it is characterized in that, in described step B, after source node MAC layer is received the DL_QoS_CREATE.request primitive of upper level applications transmission, generate the classifier rules node according to the IP version that comprises in DL_QoS_CREATE.request primitive, source address, destination address, source port number, destination slogan, after establishing for service flow, when upper strata had data to send, the parameter in packet and classifier rules node was mated.
5. by quick service stream establishing method in a kind of Wireless MESH network claimed in claim 1, it is characterized in that, in described step C, the quick service stream link of setting up between the source and destination node comprises n+2 node, n 〉=1, one of them node is source node, and a node is destination node, and n node is intermediate node in addition; Consist of example with the whole piece communication link by A, B, three nodes of C, wherein, A is source node, and B is intermediate node, and C is destination node, and the detailed interaction flow between source node A and destination node C comprises the following steps:
Step C1: source node A sends the MSH_SF_ADD_REQ request message of setting up service flow;
Step C2: intermediate node B generates MSH_SF_ADD_RSP message and MSH_SF_ADD_REQ message after receiving the MSH_SF_ADD_REQ request message that the requesting node of service flow sends immediately;
Step C3: intermediate node B joins MSH_SF_ADD_RSP message and MSH_SF_ADD_REQ message in DSCH message and sends, wherein, MSH_SF_ADD_RSP message replies to the requesting node A of service flow, and MSH_SF_ADD_REQ message sends to the next-hop node C on link;
Step C4: receive the MSH_SF_ADD_REQ message of intermediate node B transmission as the next-hop node C of link after, to intermediate node, reply MSH_SF_ADD_RSP message;
Step C5: after source node A receives the MSH_SF_ADD_RSP message of intermediate node B reply, to intermediate node, reply MSH_SF_ADD_ACK message;
Step C6: after intermediate node B received the MSH_SF_ADD_RSP message of next-hop node C reply, the down hop node was replied MSH_SF_ADD_ACK message;
Wherein, the MSH_SF_ADD_REQ message format is defined as follows:
The MSH_SF_ADD_RSP/ACK message format is defined as follows:
6. by quick service stream establishing method in a kind of Wireless MESH network claimed in claim 1, it is characterized in that, service flow set up process in need the transaction management table is safeguarded, the operation of service flow each time that source node is initiated is all affairs, comprise the establishment of service flow, deletion, change, wherein, Transaction ID is by the unique distribution of node of initiating affairs, initiating affairs node Node ID+transaction ID can affairs of unique identification, all affairs form a chained list, and the affairs on same service flow also form a chained list.
7. by quick service stream establishing method in a kind of Wireless MESH network claimed in claim 1, it is characterized in that, when the Dynamic Establishing service flow, the initiation node of service flow is that service flow is distributed unique Link ID, this Link ID=source node Node ID+SeqNum, wherein Node ID is the source node numbering, and SeqNum is random number.
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