CN103281686A - Burst transmission method for urgent service in wireless body area network - Google Patents

Burst transmission method for urgent service in wireless body area network Download PDF

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Publication number
CN103281686A
CN103281686A CN2013102082247A CN201310208224A CN103281686A CN 103281686 A CN103281686 A CN 103281686A CN 2013102082247 A CN2013102082247 A CN 2013102082247A CN 201310208224 A CN201310208224 A CN 201310208224A CN 103281686 A CN103281686 A CN 103281686A
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node
urgency traffic
time slot
frame
traffic
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CN103281686B (en
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李明
刘静
马志超
申强
袁崇伟
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Abstract

The invention discloses a burst transmission method for an urgent service in a wireless body area network. A communication link tree network is used for distributing time slots in a sequence from bottom layer nodes to top layer nodes according to a network structure. The time slots are formed by an access time frame t0 and an access time frame t1 in the process of processing the urgent service and a time frame t2 in the process of transmitting the service. When the urgent service exists in a node, a time slot expropriating request begins to be broadcast in a next time slot. The t0 time frame of the current time slot is monitored, if the time expropriating request is monitored, priority is judged on the node where the urgent service occurs, the urgent service with high priority is transmitted in the t2 time frame of the current time slot, whether the urgent service is transmitted to a root node or not is judged, if not, the time slot expropriating request continues to be sent in the next time slot, and the steps are repeated until the urgent service is transmitted to the root node in a relay mode. According to the burst transmission method for the urgent service in the wireless body area network, large handling capacity of an ordinary service is guaranteed, and the urgent service is fast and reliably transmitted to the root node with little cost.

Description

The rapid transmission method of urgency traffic in a kind of wireless body area network
Technical field
The present invention relates to transmission method professional in a kind of wireless body area network (WBAN), relate in particular 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 ill crowd of various chronic diseases sharply increases, and thing followed great number medical security expense is also brought immense pressure to state revenue and expenditure.How efficiently the human body real-time monitoring is become the focus of research on long-range.The IEEE(of international organization institute of electrical and electronic engineers) also formulates the 802.15.6 agreement and come its application of standard.WBAN is a concrete application examples of this agreement.Transducer all is miniaturization among the WBAN, is worn on body surface or implants subcutaneously, thereby the energy consumption of device just become a great restriction condition, will prolong the useful life of transducer as far as possible to this.The energy consumption of node is mainly in the transmission of business datum in the network, sees that WBAN mainly contains two kinds of types of service: general service and urgency traffic on concrete.General service, such as concentration of glucose, dissolved oxygen amount etc. in pulse frequency, the blood, these data all need periodically constantly to sample, thereby the characteristics that general service has periodically, traffic carrying capacity is big.Urgency traffic, for example blood oxygen concentration exceeds a normality threshold suddenly, needs in time this information to be sent to manager (Coordinator), just can produce a urgency traffic, thereby urgency traffic have sudden, characteristics that traffic carrying capacity is very little, but urgency traffic is vital! Hang down time delay, quickly and reliably transmission because guarantee urgency traffic.In the WBAN Network Design, how to take into account the demand of these two kinds of business to realize that maximized utilization has just become key to Internet resources.In existing technology, often all be for the consideration to general service, though some has satisfied the needs of the low time delay of urgency traffic specially at the network of urgency traffic design, the throughput of network is little, overall performance is not high.
No matter in wireless sensor network still was wireless body area network, tree-like networking technology is comparative maturity.By the mode of self-organizing or Coordinator management, tree-like networking can communicate with node quality, and father node is continuous preferably, guarantees the reliability that every jump set is defeated, thereby is used widely.
Find that by prior art documents people such as B.Latre are at " Proceeding of The4 ThAnnual International Conference on Mobile and Ubiquitous Systems:Computing, Networking and Services, Aug2007, pp.479-486 (the 4th international mobile and general fit calculation system of IMS conference, in August, 2007, the 479-486 page or leaf) " delivered on and be entitled as " A Low-delay Protocol for Multihop Wireless Body Area Networks (a kind of low time delay agreement in the multi-hop wireless body area network) " literary composition, this article proposes a kind of in the WBAN of tree structure, carries out the transmission of data by the mode of TDMA and multi-hop.Can adjust adaptively according to the traffic case of network under this scheme, for general service, can obtain very high throughput, but urgency traffic can experience bigger time delay.
Find by retrieval in addition, people such as L.Sitanayah are at " The fourth International Conference on Sensor Technologies and Applications, July2010, pp244-249 (the 4th international sensor technology and use meeting, in July, 2010, delivered 244-249) " and be entitled as " mixing multiple access access protocol at urgency traffic in the wireless sensor network of ER-MAC:A Hybrid MAC Protocol for Emergency Response Wireless Sensor Networks() " literary composition, this article proposes in wireless sensor network, and how the mode by collaboration communication in time passes urgency traffic.Under this scheme, urgency traffic can transmit on fast and reliable ground, but this scheme needs node to be in the state of waking up in actual implementation procedure always, and energy consumption is bigger.
In addition, people such as Mohammad A. are at " International Symposium on Communications and Information Technologies, Oct2012, pp371-374 (communication and information technology international symposium, in May, 2012,371-374) " delivered on and be entitled as " MEB MAC:Improved Channel Access Scheme for Medical Emergency Traffic in WBAN (at the multiple access access scheme of medical emergency business) " literary composition, this article proposes in Star Network, by insert the mode of ' listen window ' in each frame, urgency traffic just can send urgency traffic by these ' listen window '.This scheme can send urgency traffic with low time delay, but all inserts ' listen window ' in each frame, certainly will cause communication resource waste; In addition, insertion algorithm has certain complexity, and the number of insertion listen window does not have good optimization solution.Though last this scheme has the passage that transmits urgency traffic, can not guarantee that urgency traffic is delivered to manager (Coordinator) reliably in ' listen window '.
Therefore, those skilled in the art is devoted to develop a kind of rapid transmission method at urgency traffic, has both guaranteed network throughput, can realize that urgency traffic fast and reliable ground transmits with less resource consumption again.
Summary of the invention
Because the above-mentioned defective of prior art, technical problem to be solved by this invention provide a kind of in wireless body area network the rapid transmission method of urgency traffic, this method transmits urgency traffic with time slot requisition request mode.
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 the 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 each described frame is made up of n time slot, and according to the order of time slot: T 1, T 2..., T nTransmit; Described root node is given the node of described time slot allocation correspondence: T according to described tree network 1Slot transmission N 1Node traffic, T 2Slot transmission N 2Node traffic ..., T nSlot transmission N nNode traffic, and each described time slot comprises: handle the period t that urgency traffic inserts 0And t 1And the period t of transport service 2As the node of the described tree network T at the i frame M-1When urgency traffic appears in time slot, wherein i=1,2 ..., m=2,3 ..., n, the transmitting step of this urgency traffic comprises:
Step (201): the urgency traffic node is at described i frame T mWhen beginning, sends time slot time slot requisition request;
Step (202): intercept described i frame T mThe t of time slot 0Period, judged whether time slot requisition request: if there is not time slot requisition request, then directly at the described T of described i frame mThe t of time slot 2Period transmission and described i frame T mThe N of time slot correspondence 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 mSelf does not have urgency traffic node, then with described urgency traffic node as new urgency traffic node, and jump to step (205); If described N mSelf has urgency traffic node, then jumps to step (204);
Step (204): judge described N mThe priority of the urgency traffic of the urgency traffic of node and described urgency traffic node: will have the node of high priority urgency traffic as new urgency traffic node, and jump to step (205); To have the node of low priority urgency traffic as described urgency traffic node, and when m=1,2,3 ..., during n-1, m=m+1; When m=n, m=1, i=i+1 jumps to described step (201) then;
Step (205): at described i frame T mThe t of time slot 2Period, transmit the urgency traffic of described new urgency traffic node to the father 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 jumps to step (207); If described father node is not described root node, with described father node as described urgency traffic node, and when m=1,2,3 ..., during n-1, m=m+1; When m=n, m=1, i=i+1 jumps to described step (201) then;
Step (207): finish transmission.
Preferably, described time slot is successively distributed to top mode by bottom layer node according to described tree network.
Further, described frame begin also to comprise beacon frame, described beacon frame comprises time slot allocation information.
Further, the period t of described processing urgency traffic access 0And t 1Length than the period t of described transport service 2Length short.
Further, described time slot requisition request comprises the information of described 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 the described step (204): the time of origin of described urgency traffic the preceding, the priority height of described urgency traffic; The time of origin of described urgency traffic after, 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 is sent " NACK " information, and at described i frame T mThe t of time slot 2Period is transmitted described N 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 is sent " ACK " information, abdicates described i frame T mThe t of time slot 2Period, and transmit the urgency traffic of described new urgency traffic node in this period.
In a preferred embodiment of the present invention, at same time slot, the number of nodes that sends time slot requisition request is one or more
In preferred embodiments of the present invention, set up the 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 the manager is with the node of each time slot allocation correspondence.And each time slot is by t 0, t 1And t 2Three periods constitute t 0And t 1Insert t for the treatment of urgency traffic 2Be used for transport service.When urgency traffic appearred in the node in the tree network, the urgency traffic node sent a time slot requisition request when ensuing time slot begins; Then at t 0Period intercepts, and has judged whether time slot requisition request, as does not have then directly to transmit the business of this time slot corresponding node; If any time slot requisition request, judge at first then whether the node self of this time slot correspondence has urgency traffic, if there is not urgency traffic, then with the urgency traffic node as new urgency traffic node, and at t 2Period is transmitted the business of new urgency traffic node to the father node of new urgency traffic node; If urgency traffic is arranged, then will be according to priority, what priority was low begins to send time slot requisition request as the urgency traffic node at next time slot, transmits according to above-mentioned steps again; Priority high then as new urgency traffic node at t 2Period is transmitted the urgency traffic of new urgency traffic node to the father node of new urgency traffic node; Judge whether father node is root node, if not then with father node as the urgency traffic node, begin to send time slot requisition request at next time slot, again according to the above-mentioned steps transmission, till passing to root node at last.
The advantage of present embodiment is: when urgency traffic occurs, obtain the current time slots right to use by time slot requisition request, urgency traffic can be sent to the upper strata under the tree-like communication link reliably fast, and this mode can go on up to being sent to root node by a direct force, i.e. manager (Coordinator).This scheme node operating mechanism is simple.And in the process of at every turn delivering in relays, have only relevant several nodes can be in the state of waking, for whole network, energy consumption is very little.So just, be cost with less energy consumption, fast and reliable ground transmits urgency traffic and does not influence 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 purpose of the present invention, feature and effect fully.
Description of drawings
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 structural representation 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 tree network shown in Figure 3.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is implemented under with the technical solution of the present invention prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
The rapid transmission method of urgency traffic is to carry out in only comprising the tree-like communication link network of a root node in the wireless body area network of the present invention, and tree network transmits according to frame, each frame is made up of time slot, order according to time slot allocation is transmitted, specifically as shown in Figure 1, and the beginning of each frame has a beacon frame (Beacon), has comprised the time slot allocation situation in this frame in the beacon frame.Time slot is to distribute to the principle that top mode successively distributes according to the bottom layer node of tree network.Wherein each time slot comprises t 0, t 1And t 2Three periods, t 0And t 1Period is inserted for the treatment of urgency traffic, t 2Period is used for transport service.When urgency traffic appearred in the node in the 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 the tree structure that adopts of the present invention is not limited to 10 nodes.Node N wherein 1Be root node, i.e. manager, carry out time slot allocation based on the principle of TDMA: each frame distributes 9 time slots, and each frame begin to increase a 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 to be distributed to top mode by bottom layer node, specifically as shown in Figure 4.At first transmit the business of bottom layer node: T 1Slot transmission node N 8Business, T 2Slot transmission node N 9Business, T 3Slot transmission node N 10Business; Transmit the father node of bottom layer node: T then 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 T to top mode with this 8Slot transmission N 2The business of node, T 9Slot transmission N 3The business of node.
Suppose the T at the i frame 7Time slot, node N 10Urgency traffic appears, and at node N 10Urgency traffic be sent to root node N 1Time period in do not have other urgency traffic to take place, so next in the mode of delivering in relays fast urgency traffic is delivered to the manager by time slot requisition mode of the present invention:
Relay for the first time:
Step 201 is at T 8The beginning of time slot, node N 10As a time slot requisition of urgency traffic node broadcasts request; This time slot requisition request comprises the nodal information of time slot requisition request, i.e. node N 10The generation time of node and urgency traffic.
Step 202, current time slots are the T of i frame 8Time slot is according to the time slot allocation table of Fig. 4, T 8Time slot is for transmission node N 3Business.At this moment, 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 7The current time slots specified node is node N 3Be in the node N of " waking up " state 1, N 2, N 3, N 6And N 7To t 0Carry out channel and intercept, listen to time slot requisition request, jump to step 203.
Step 203, according to time slot requisition solicited message, the node that continues to wake is N 1, N 3, N 7And N 10This moment node N 3There is not urgency traffic, just with node N 10As new urgency traffic node, jump to step 205.
Step 205, node N 3At t 1Period replys an ACK information and gives new urgency traffic node N 10, node N 10After receiving ACK information, immediately with urgency traffic at t 2Period sends its father node N to 7
Step 206, in the tree network of present embodiment, root node is node N 1So, with node N 10Father node N 7As the urgency traffic node, rebound step 201 again.
Carry out the relay second time:
Step 201 is at the T of i 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 7And the generation time of urgency traffic.
Step 202, current time slots are the T of i frame 9Time slot is according to the time slot allocation table of Fig. 4, T 9Time slot is for transmission node N 2Business.At this moment, 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 and intercept, listen to time slot requisition request after, jump to step 203.
Step 203, according to time slot requisition solicited message, the node that continues to wake is N 1, N 2, N 3And N 7This moment node N 2There is not urgency traffic, just with node N 7As new urgency traffic node, and jump to step 205.
Step 205, node N 2At t 1Period replys an ACK information and gives new urgency traffic node N 10, node N 10After receiving ACK information, immediately the urgency traffic bag is sent to its father node N 3
Step 206, node N 3Not root node N 1, with node N 7Father node N 3As the urgency traffic node, rebound step 201 again.
Carry out relay for the third time:
Step 201 is at the T of i+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 3And the generation time of urgency traffic.
Step 202, current time slots are the T of i+1 frame 1Time slot, according to the time slot allocation table of Fig. 4 as can be known, T 1Time slot is for transmission node N 8Business.At this moment, 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 and intercept, listen to time slot requisition request after, jump to step 203.
Step 203, according to time slot requisition solicited message, the node that continues to wake is N 1, N 3, N 6And N 8This moment node N 8There is not urgency traffic, just with node N 3As new urgency traffic node, jump to step 205.
Step 205, node N 8At t 1Period replys an ACK information and gives new urgency traffic node N 3, node N 3After receiving ACK information, immediately the urgency traffic bag is sent to its father node N 1
Step 206, node N 1Be root node N 1, jump to step 207.
Step 207 finishes transmission.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all technical staff in the art all should be in the determined protection range by 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 the interior urgency traffic of wireless body area network is characterized in that,
Set up the 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 each described frame is made up of n time slot, and according to the order of time slot: T 1, T 2..., T nTransmit; Described root node is given the node of described time slot allocation correspondence: T according to described tree network 1Slot transmission N 1Node traffic, T 2Slot transmission N 2Node traffic ..., T nSlot transmission N nNode traffic, and each described time slot comprises: handle the period t that urgency traffic inserts 0And t 1And the period t of transport service 2As the node of the described tree network T at the i frame M-1When urgency traffic appears in time slot, wherein i=1,2 ..., m=2,3 ..., n, the transmitting step of this urgency traffic comprises:
Step (201): the urgency traffic node is at described i frame T mWhen beginning, sends time slot time slot requisition request;
Step (202): intercept described i frame T mThe t of time slot 0Period, judged whether time slot requisition request: if there is not time slot requisition request, then directly at the described T of described i frame mThe t of time slot 2Period transmission and described i frame T mThe N of time slot correspondence 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 mSelf does not have urgency traffic node, then with described urgency traffic node as new urgency traffic node, and jump to step (205); If described N mSelf has urgency traffic node, then jumps to step (204);
Step (204): judge described N mThe priority of the urgency traffic of the urgency traffic of node and described urgency traffic node: will have the node of high priority urgency traffic as new urgency traffic node, and jump to step (205); To have the node of low priority urgency traffic as described urgency traffic node, and when m=1,2,3 ..., during n-1, m=m+1; When m=n, m=1, i=i+1 jumps to described step (201) then;
Step (205): at described i frame T mThe t of time slot 2Period, transmit the urgency traffic of described new urgency traffic node to the father 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 jumps to step (207); If described father node is not described root node, with described father node as described urgency traffic node, and when m=1,2,3 ..., during n-1, m=m+1; When m=n, m=1, i=i+1 jumps to described step (201) then;
Step (207): finish 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, described frame begin also to comprise beacon frame, 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 that described processing urgency traffic inserts 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 information of described 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 the described step (204): the time of origin of described urgency traffic the preceding, the priority height of described urgency traffic; The time of origin of described urgency traffic after, 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), is described N as if described new urgency traffic node mNode, so described N mNode is at described i frame T mThe t of time slot 1Period is sent a nack message, and at described i frame T mThe t of time slot 2Period is transmitted described N 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 is sent an ACK information, abdicates described i frame T mThe t of time slot 2Period, and transmit the urgency traffic of described new urgency traffic node in this period.
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 that sends time slot requisition request is one or more.
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CN105792287A (en) * 2016-03-01 2016-07-20 山东省计算中心（国家超级计算济南中心） Protection time slot self-adaptive distribution and performance evaluation method of wireless body area network
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CN104735755A (en) * 2013-12-23 2015-06-24 中兴通讯股份有限公司 Service processing method and system for wireless body area network
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