CN103281686B - The rapid transmission method of urgency traffic in a kind of wireless body area network - Google Patents
The rapid transmission method of urgency traffic in a kind of wireless body area network Download PDFInfo
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- CN103281686B CN103281686B CN201310208224.7A CN201310208224A CN103281686B CN 103281686 B CN103281686 B CN 103281686B CN 201310208224 A CN201310208224 A CN 201310208224A CN 103281686 B CN103281686 B CN 103281686B
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Abstract
The invention discloses the rapid transmission method of urgency traffic in a kind of wireless body area network, utilize communication link tree network, according to network configuration by the order-assigned time slot of bottom layer node to top mode.And time slot is by the period t processing urgency traffic access
0and t
1, and the period t of transport service
2composition.When urgency traffic appears in node, to go on the air time slot requisition request at time slot immediately.Intercept the t of current time slots
0period, if listen to " time requisition request ", then to occurring that the node of urgency traffic judges priority, at the t of current time slots
2period transmits the high urgency traffic of priority, and judges whether urgency traffic is transferred to root node, if not, continue to send time slot requisition request at next time slot, repeat above-mentioned steps, with the form of relay until urgency traffic is transferred to root node.Namely this method ensures the large throughput of general service, and what make urgency traffic fast and reliable with very little cost again is sent to root node.
Description
Technical field
The present invention relates to the transmission method of a kind of wireless body area network (WBAN) interior business, particularly relate to the rapid transmission method of urgency traffic in a kind of wireless body area network.
Background technology
In recent years, in the world, the problem of an aging population highlights day by day, and the patient groups of various chronic disease sharply increases, and thing followed high medical support cost also brings immense pressure to state revenue and expenditure.How from the focus efficiently human body real-time monitoring being become to research long-range.International organization IEEE(institute of electrical and electronic engineers) also formulate 802.15.6 agreement and carry out its application of specification.WBAN is an embody rule example of this agreement.In WBAN, transducer is all miniaturized, is worn on body surface or implants subcutaneous, and thus the energy consumption of device has just become a great restriction condition, will extend the useful life of transducer to this as far as possible.The energy consumption of nodes is mainly in the transmission of business datum, and see on concrete, WBAN mainly contains two kinds of types of service: general service and urgency traffic.General service, such as pulse frequency, the concentration of glucose in blood, dissolved oxygen amount etc., these data all need periodically constantly to sample, the feature that thus general service has periodically, traffic carrying capacity is large.Urgency traffic, such as blood oxygen concentration exceeds suddenly a normality threshold, needs to send this information to manager (Coordinator) in time, just a urgency traffic can be produced, thus urgency traffic has sudden, the feature that traffic carrying capacity is very little, but urgency traffic is vital! Because ensure urgency traffic low time delay, quickly and reliably transmit.In the design of WBAN network, how to take into account the demand of these two kinds of business to realize just having become key to the maximized utilization of Internet resources.In existing technology, be all often for the consideration to general service, although some network designed for urgency traffic specially meets the needs of urgency traffic low time delay, the throughput of network is little, and overall performance is not high.
No matter in wireless sensor network or wireless body area network, tree-like networking technology comparative maturity.By the mode that self-organizing or Coordinator manage, node can be communicated with the good father node of quality and be connected by tree-like networking, ensures the reliability that every jump set is defeated, is thus used widely.
Find by prior art documents, the people such as B.Latre are at " ProceedingofThe4
thannualInternationalConferenceonMobileandUbiquitousSystem s:Computing, NetworkingandServices, Aug2007, pp.479-486 (the 4th international mobile and general fit calculation system of IMS conference, in August, 2007, 479-486 page) " on delivered and be entitled as " ALow-delayProtocolforMultihopWirelessBodyAreaNetworks (a kind of low time delay agreement in multi-hop wireless body area network) " one literary composition, this article proposes a kind of in the WBAN of tree structure, the transmission of data is carried out by the mode of TDMA and multi-hop.Can adjust adaptively according to the traffic case of network under the program, very high throughput can be obtained for general service, but urgency traffic can experience larger time delay.
Separately find through retrieval, the people such as L.Sitanayah are at " ThefourthInternationalConferenceonSensorTechnologiesandA pplications, July2010, pp244-249 (the 4th international sensor technology and application meeting, in July, 2010, 244-249) " on delivered and be entitled as " ER-MAC:AHybridMACProtocolforEmergencyResponseWirelessSen sorNetworks(mono-is for the mixing multiple access protocol of urgency traffic in wireless sensor network) " literary composition, this article proposes in wireless sensor network, how by the mode of collaboration communication, urgency traffic to be passed in time.Under this scenario, urgency traffic can transmit on fast and reliable ground, but the program needs node to be in the state of waking up in actual implementation procedure always, and observable index is larger.
In addition, MohammadA. wait people at " InternationalSymposiumonCommunicationsandInformationTech nologies, Oct2012, pp371-374 (communication and information technology international symposium, in May, 2012, 371-374) " on delivered and be entitled as " MEBMAC:ImprovedChannelAccessSchemeforMedicalEmergencyTra fficinWBAN (multiple access schemes for medical emergency business) " one literary composition, this article proposes in Star Network, by inserting the mode of ' listen window ' in each frame, urgency traffic just can be sent by these ' listen window ' by urgency traffic.Urgency traffic can send with comparatively low time delay by the program, but all inserts in each frame ' listen window ', and the communication resource certainly will be caused to waste; In addition, insertion algorithm has certain complexity, and the number inserting listen window does not have good optimization solution.Although the last program has the passage transmitting urgency traffic, can not ensure that urgency traffic is reliably delivered to manager (Coordinator) in ' listen window '.
Therefore, those skilled in the art is devoted to develop a kind of rapid transmission method for urgency traffic, both ensures network throughput, and transmits with realizing again urgency traffic fast and reliable with less resource consumption.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of rapid transmission method of urgency traffic in wireless body area network, and the method transmits urgency traffic in the mode of time slot requisition request.
For achieving the above object, the invention provides the rapid transmission method of urgency traffic in a kind of wireless body area network, it is characterized in that,
Set up communication link tree network, described tree network comprises 1 root node and n node, wherein n>=1; N described node transmits according to frame, and frame described in each is made up of n time slot, and according to the order of time slot: T
1, T
2..., T
ntransmit; The node that described root node gives described time slot allocation corresponding according to described tree network: T
1slot transmission N
1node traffic, T
2slot transmission N
2node traffic ..., T
nslot transmission N
nnode traffic, and each described time slot comprises: the period t of process urgency traffic access
0and t
1and the period t of transport service
2; When the node of described tree network is at the T of the i-th frame
m-1when there is urgency traffic in time slot, wherein i=1,2 ..., m=2,3 ..., n, the transmitting step of this urgency traffic comprises:
Step (201): urgency traffic node is at described i frame T
mtime slot requisition request is sent when time slot starts;
Step (202): intercept described i frame T
mthe t of time slot
0period, judged whether time slot requisition request: if do not have time slot take over for use request, then direct described in described i frame T
mthe t of time slot
2period transmission and described i frame T
mthe N that time slot is corresponding
mthe business of node; If listen to time slot requisition request, jump to step (203);
Step (203): judge described N
mwhether node self has urgency traffic: if described N
mnode self does not have urgency traffic, then using described urgency traffic node as new urgency traffic node, and jump to step (205); If described N
mnode self has urgency traffic, then jump to step (204);
Step (204): judge described N
mthe priority of the urgency traffic of node and the urgency traffic of described urgency traffic node: will there is the node of high priority urgency traffic as new urgency traffic node, and jump to step (205); To there is the node of low priority urgency traffic as described urgency traffic node, and when m=1,2,3 ..., n-1 time, m=m+1; As m=n, m=1, i=i+1, then jump to described step (201);
Step (205): at described i frame T
mthe t of time slot
2period, transmit the father node of urgency traffic to described new urgency traffic node of described new urgency traffic node;
Step (206): judge whether described father node is described root node: described father node is described root node, then jump to step (207); If described father node is not described root node, using described father node as described urgency traffic node, and when m=1,2,3 ..., n-1 time, m=m+1; As m=n, m=1, i=i+1, then jump to described step (201);
Step (207): terminate transmission.
Preferably, described time slot is successively distributed to top mode by bottom layer node according to described tree network.
Further, the starting of described frame also comprises beacon frame, and described beacon frame comprises time slot allocation information.
Further, the period t of described process urgency traffic access
0and t
1length than the period t of described transport service
2length short.
Further, described time slot requisition request comprises the described information of urgency traffic node and the generation time of urgency traffic.
Further, the time of origin of described urgency traffic is the criterion of the priority of urgency traffic described in described step (204): the time of origin of described urgency traffic is preceding, and the priority of described urgency traffic is high; The time of origin of described urgency traffic is posterior, and the priority of described urgency traffic is low.
Further, in described step (205), if described new urgency traffic node is described N
mnode, so described N
mnode is at described i frame T
mthe t of time slot
1period sends " NACK " information, and at described i frame T
mthe t of time slot
2n described in period transmission
mthe urgency traffic of node; If described new urgency traffic node is not described N
mnode, so described N
mnode is at described i frame T
mthe t of time slot
1period sends " ACK " information, abdicates described i frame T
mthe t of time slot
2period, and described in this period transmission the urgency traffic of new urgency traffic node.
In a preferred embodiment of the present invention, at same time slot, the number of nodes sending time slot requisition request is one or more
In better embodiment of the present invention, set up communication link tree network, wherein tree network comprises 1 root node and n node, and root node is as manager (Coordinator); The node traffic of tree network transmits according to frame, and each frame is made up of n time slot, and according to the sequential delivery of time slot; The principle that root node is successively distributed to top mode by bottom layer node according to described tree network as manager, by node corresponding for each time slot allocation.And each time slot is by t
0, t
1and t
2three periods are formed, t
0and t
1for the treatment of urgency traffic access, t
2for transport service.When urgency traffic appears in the node in tree network, when ensuing time slot starts, urgency traffic node sends a time slot requisition request; Then at t
0period intercepts, and having judged whether time slot requisition request, as not having, directly having transmitted the business of this time slot corresponding node; If any time slot requisition request, then first judge whether the node self that this time slot is corresponding has urgency traffic, if there is no urgency traffic, then using urgency traffic node as new urgency traffic node, and at t
2the business of period transmission new urgency traffic node is to the father node of new urgency traffic node; If there is urgency traffic, then will according to priority, what priority was low starts to send time slot requisition request at next time slot as urgency traffic node, then transmits according to above-mentioned steps; Priority high then as new urgency traffic node at t
2the urgency traffic of period transmission new urgency traffic node is to the father node of new urgency traffic node; Judge whether father node is root node, if not then using father node as urgency traffic node, start to send time slot requisition request at next time slot, then according to above-mentioned steps transmission, till finally passing to root node.
The advantage of the present embodiment is: when urgency traffic occurs, the current time slots right to use is obtained by time slot requisition request, urgency traffic can be sent to upper strata fast under reliably tree-like communication link, and which can go on until be sent to root node by a direct force, i.e. manager (Coordinator).Program node operating mechanism is simple.And delivering in relays in process, only have relevant several node to be in the state of waking, for whole network, energy consumption is very little at every turn.So just with less energy consumption for cost, fast and reliable ground transmits urgency traffic and does not affect the throughput performance of network.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of the rapid transmission method of urgency traffic in a kind of wireless body area network of the present invention;
Fig. 2 is the step schematic diagram of the rapid transmission method of urgency traffic in a kind of wireless physical culture net of the present invention;
Fig. 3 is the tree network structure schematic diagram of a preferred embodiment of the rapid transmission method of urgency traffic in a kind of wireless body area network of the present invention;
Fig. 4 is the time slot allocation figure of the tree network shown in Fig. 3.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under with technical solution of the present invention prerequisite, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
In wireless body area network of the present invention, the rapid transmission method of urgency traffic carries out in the tree-like communication link network only comprising a root node, and tree network transmits according to frame, each frame is made up of time slot, transmit according to the order of time slot allocation, specifically as shown in Figure 1, and the beginning of each frame has a beacon frame (Beacon), contains the Time slot allocation situation in this frame in beacon frame.Time slot is that the principle of successively distributing to top mode according to the bottom layer node of tree network is distributed.Wherein each time slot comprises t
0, t
1and t
2three periods, t
0and t
1period is accessed for the treatment of urgency traffic, t
2period is used for transport service.When urgency traffic appears in the node in tree network, the concrete transmitting step of this urgency traffic as shown in Figure 2.
In an embodiment of the present invention, employing be the wireless body area network of the tree structure of 1 root node and 9 nodes, as shown in Figure 3.But the wireless body area network of of the present invention adopted tree structure is not limited to 10 nodes.Its interior joint N
1for root node, i.e. manager, the principle based on TDMA carries out time slot allocation: each frame distributes 9 time slots, and each frame start increase beacon frame (Beacon) information, beacon frame (Beacon) information comprises the Time slot allocation situation in this frame.The allocation order of 9 time slots is successively distributed to top mode by bottom layer node, specifically as shown in Figure 4.First the business of bottom layer node is transmitted: T
1slot transmission node N
8business, T
2slot transmission node N
9business, T
3slot transmission node N
10business; Then the father node of bottom layer node is transmitted: T
4slot transmission N
4the business of node, T
5slot transmission N
5the business of node, T
6slot transmission N
6the business of node, T
7slot transmission N
7the business of node; Analogize to top mode with this, T
8slot transmission N
2the business of node, T
9slot transmission N
3the business of node.
Suppose the T at the i-th frame
7time slot, node N
10there is urgency traffic, and at node N
10urgency traffic be sent to root node N
1time period in do not have other urgency traffic to occur, so next in the mode of delivering in relays fast, urgency traffic is delivered to manager by time slot of the present invention requisition mode:
First time relay:
Step 201, at T
8the beginning of time slot, node N
10as the time slot requisition request of urgency traffic node broadcasts; This time slot requisition request comprises the nodal information of time slot requisition request, i.e. node N
10node, and the generation time of urgency traffic.
Step 202, current time slots is the T of the i-th frame
8time slot, according to the Schedule of Fig. 4, T
8time slot is for transmission node N
3business.Now, all father nodes and current time slots given transmission node are in " waking up " state.In the present embodiment, father node is node N
1, N
2, N
3, N
6and N
7; Current time slots specified node is node N
3.Be in the node N of " waking up " state
1, N
2, N
3, N
6and N
7to t
0carry out channel sense, listen to time slot requisition request, jump to step 203.
Step 203, according to time slot requisition solicited message, the node continuing to wake is N
1, N
3, N
7and N
10.Now node N
3there is no urgency traffic, just by node N
10as new urgency traffic node, jump to step 205.
Step 205, node N
3at t
1period replys an ACK information to new urgency traffic node N
10, node N
10after receiving ACK information, immediately by urgency traffic at t
2period sends its father node N to
7.
Step 206, in the tree network of the present embodiment, root node is node N
1, so by node N
10father node N
7as urgency traffic node, rebound step 201 again.
Carry out second time relay:
Step 201, at the T of the i-th frame
9the beginning of time slot, urgency traffic node N
7broadcast a time slot requisition request; This time slot requisition request comprises the nodal information of time slot requisition request, i.e. node N
7, and the generation time of urgency traffic.
Step 202, current time slots is the T of the i-th frame
9time slot, according to the Schedule of Fig. 4, T
9time slot is for transmission node N
2business.Now, all father node N
1, N
2, N
3, N
6and N
7, and current time slots given transmission node N
2be in " waking up " state.Be in the node N of " waking up " state
1, N
2, N
3, N
6and N
7to t
0carry out channel sense, after listening to time slot requisition request, jump to step 203.
Step 203, according to time slot requisition solicited message, the node continuing to wake is N
1, N
2, N
3and N
7.Now node N
2there is no urgency traffic, just by node N
7as new urgency traffic node, and jump to step 205.
Step 205, node N
2at t
1period replys an ACK information to new urgency traffic node N
10, node N
10after receiving ACK information, send urgency traffic bag to its father node N immediately
3.
Step 206, node N
3not root node N
1, by node N
7father node N
3as urgency traffic node, rebound step 201 again.
Carry out third time relay:
Step 201, at the T of the i-th+1 frame
1the beginning of time slot, urgency traffic node N
3broadcast a time slot requisition request; This time slot requisition request comprises the nodal information of time slot requisition request, i.e. node N
3, and the generation time of urgency traffic.
Step 202, current time slots is the T of the i-th+1 frame
1time slot, according to the Schedule of Fig. 4, T
1time slot is for transmission node N
8business.Now, all father node N
1, N
2, N
3, N
6and N
7, and current time slots given transmission node N
8be in " waking up " state.Be in the node N of " waking up " state
1, N
2, N
3, N
6, N
7and N
8to t
0carry out channel sense, after listening to time slot requisition request, jump to step 203.
Step 203, according to time slot requisition solicited message, the node continuing to wake is N
1, N
3, N
6and N
8.Now node N
8there is no urgency traffic, just by node N
3as new urgency traffic node, jump to step 205.
Step 205, node N
8at t
1period replys an ACK information to new urgency traffic node N
3, node N
3after receiving ACK information, send urgency traffic bag to its father node N immediately
1.
Step 206, node N
1root node N
1, jump to step 207.
Step 207, terminates transmission.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technical staff in the art, all should by the determined protection range of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (8)
1. the rapid transmission method of urgency traffic in wireless body area network, is characterized in that,
Set up communication link tree network, described tree network comprises 1 root node and n node, wherein n>=1; N described node transmits according to frame, and frame described in each is made up of n time slot, and according to the order of time slot: T
1, T
2..., T
ntransmit; The node that described root node gives described time slot allocation corresponding according to described tree network: T
1slot transmission N
1node traffic, T
2slot transmission N
2node traffic ..., T
nslot transmission N
nnode traffic, wherein N
1, N
2n
nrepresent the 1st, 2 ... business on n node; And each described time slot comprises: the period t of process urgency traffic access
0and t
1and the period t of transport service
2; When the node of described tree network is at the T of the i-th frame
m-1when there is urgency traffic in time slot, wherein i=1,2 ..., m=2,3 ..., n, the transmitting step of this urgency traffic comprises:
Step (201): urgency traffic node is at described i-th frame T
mtime slot requisition request is sent when time slot starts;
Step (202): intercept described i-th frame T
mthe t of time slot
0period, judged whether time slot requisition request: if do not have time slot take over for use request, then direct described in described i-th frame T
mthe t of time slot
2period transmission and described i-th frame T
mthe N that time slot is corresponding
mthe business of node; If listen to time slot requisition request, jump to step (203);
Step (203): judge described N
mwhether node self has urgency traffic: if described N
mnode self does not have urgency traffic, then using described urgency traffic node as new urgency traffic node, and jump to step (205); If described N
mnode self has urgency traffic, then jump to step (204);
Step (204): judge described N
mthe priority of the urgency traffic of node and the urgency traffic of described urgency traffic node: will there is the node of high priority urgency traffic as new urgency traffic node, and jump to step (205); To there is the node of low priority urgency traffic as described urgency traffic node, and when m=1,2,3 ..., n-1 time, m=m+1; As m=n, m=1, i=i+1, then jump to described step (201);
Step (205): at described i-th frame T
mthe t of time slot
2period, transmit the father node of urgency traffic to described new urgency traffic node of described new urgency traffic node;
Step (206): judge whether described father node is described root node: described father node is described root node, then jump to step (207); If described father node is not described root node, using described father node as described urgency traffic node, and when m=1,2,3 ..., n-1 time, m=m+1; As m=n, m=1, i=i+1, then jump to described step (201);
Step (207): terminate transmission.
2. the rapid transmission method of urgency traffic in a kind of wireless body area network as claimed in claim 1, wherein, described time slot is successively distributed to top mode by bottom layer node according to described tree network.
3. the rapid transmission method of urgency traffic in a kind of wireless body area network as claimed in claim 1, wherein, the starting of described frame also comprises beacon frame, and described beacon frame comprises time slot allocation information.
4. the rapid transmission method of urgency traffic in a kind of wireless body area network as claimed in claim 1, wherein, the period t of described process urgency traffic access
0and t
1length than the period t of described transport service
2length short.
5. the rapid transmission method of urgency traffic in a kind of wireless body area network as claimed in claim 1, wherein, described time slot requisition request comprises the described information of urgency traffic node and the generation time of urgency traffic.
6. the rapid transmission method of urgency traffic in a kind of wireless body area network as claimed in claim 5, wherein, the time of origin of described urgency traffic is the criterion of the priority of urgency traffic described in described step (204): the time of origin of described urgency traffic is preceding, and the priority of described urgency traffic is high; The time of origin of described urgency traffic is posterior, and the priority of described urgency traffic is low.
7. the rapid transmission method of urgency traffic in a kind of wireless body area network as claimed in claim 1, wherein, in described step (205), if described new urgency traffic node is described N
mnode, so described N
mnode is at described i-th frame T
mthe t of time slot
1period sends a nack message, and at described i-th frame T
mthe t of time slot
2n described in period transmission
mthe urgency traffic of node; If described new urgency traffic node is not described N
mnode, so described N
mnode is at described i-th frame T
mthe t of time slot
1period sends an ACK information, abdicates described i-th frame T
mthe t of time slot
2period, and described in this period transmission the urgency traffic of new urgency traffic node.
8. the rapid transmission method of urgency traffic in a kind of wireless body area network as claimed in claim 1, wherein, at same time slot, the number of nodes sending time slot requisition request is one or more.
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| CN105792287B (en) * | 2016-03-01 | 2019-04-09 | 山东省计算中心（国家超级计算济南中心） | The protection time slot self-adjusted block and method of evaluating performance of wireless body area network |
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| CN102123515A (en) * | 2011-03-10 | 2011-07-13 | 西安电子科技大学 | Superframe-based efficient media access control method in wireless body area network |
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| CN102123515A (en) * | 2011-03-10 | 2011-07-13 | 西安电子科技大学 | Superframe-based efficient media access control method in wireless body area network |
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