CN105050094A - Wireless body area network coexisting method based on superframe active period intersection - Google Patents
Wireless body area network coexisting method based on superframe active period intersection Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention relates to a wireless body area network coexisting method, which is characterized in that two preferentially existing BANs (body area networks) are selected to act as reference networks, wherein one of the BANs acts as a main reference network, and the other acts as an auxiliary reference network. The wireless body area network coexisting method comprises the steps that a newly joined BAN receives and parses beacon frames of the main reference network, and whether the newly joined BAN is overlapped with the main reference network in superframe active period or not is judged; if the newly joined BAN is overlapped with the main reference network in superframe active period, a superframe active period intersection request frame is sent to the main reference network, the main reference network sends a superframe active period intersection response frame to notify the newly joined BAN of whether the request is agreed or not, and if the main reference network receives the superframe active period intersection request, the newly joined BAN adjusts a beacon period (superframe) boundary and a non-active period so as to realize superframe active period intersection with the main reference network. The method provided by the invention realizes that one BAN can share the same operation channel with one or more other BANs by adopting a mode of staggering the superframe active periods of adjacent body area networks.
Description
Technical field
The invention belongs to communication technical field, relate to the implementation method that wireless body area network coexists, be specially a kind of wireless body area network coexistence method intersected based on superframe active period.
Background technology
Wireless body area network is based on wireless sense network, an important component part of Ubiquitous Network, by in human implantable, be worn on health and be distributed in the communication network that the transducer of human peripheral and intelligent terminal form, mainly through collecting, transmitting and the physiological data of analyzing and processing human body and environmental data, realize the function such as Intellisense and remote monitoring.Body area network has very important meaning and huge demand in the application in the fields such as remote diagnosis, health care, community medicine and special population monitoring, and day by day becomes the focus of investigation and application.Body area network, except being applied to health care, special population monitoring and the aspect such as Health restoration, also can be widely used in the fields such as electronic information, show business, sports, ambient intelligence, military security and society be public.
Consider the feature of the aspects such as energy resource consumption, cost, the network bandwidth, storage and computational resource, designing efficient BAN is a very complicated task.And the situation occurred during the network operation such as node failure, network interferences etc. can affect efficiency and the reliability of BAN.Particularly, the interference between adjacent BANs seriously can cause performance and the decrease in efficiency of BAN.
When guarding for health medical treatment when body area network is applied to the occasion such as hospital, community, multiple BANs coexisted can be there is in certain scope.When the adjacent BANs of two or more is operated in same channel, the active period of different B ANs can be caused to overlap, adjacent BANs produces interference, thus affects the proper communication of each BAN.
In order to the interference problem solved between adjacent BANs needs to allocate in advance to the independent channel of each BAN mono-, the BANs be disturbed is switched to correct channel to realize, namely adopts channel switching techniques.In 2.4GHz frequency range, the non-overlapped channel quantity of IEEE802.15.6 is limited, and the centre frequency of channel is spaced apart 1MHz, in certain scope, during except there is a lot of BANs, also to consider the impact of other short-distance wireless communication technology as IEEE802.11 (WiFi) or bluetooth, because they have larger channel width, the quantity of clear channel can be reduced.So when the quantity of channel glitch-free in network is less than the quantity of the BANs of existence or does not have idle channel, channel switching then can not use.
In order to solve the problem that wireless body area network coexists, should adopt one effectively, method flexibly.Adopt the method for the superframe active period of staggered adjacent BANs herein, BAN sends superframe active period to another BAN and intersects request, for asking its superframe active period staggered; The hub of another BAN upon receiving a request, in conjunction with own net beacon period (superframe) length and the priority of inactive phase and BAN to be asked determine sending superframe active period cross response frame determines whether agree to that this asks; If the hub of another BAN receives this request, the hub of the BAN then asking superframe active period to be intersected should adjust its beacon period (superframe) border and inactive phase, the superframe active period of asking to obtain it is handed over, and efficiently solves the interference problem between wireless body area network.
Be called in the patent (application number: 201110217632.X) of " self-adapting anti-jamming method of wireless sensor network " in Shanghai Communications University by what accept, propose according to node state, anti-interference cost, applying markov decision process generates corresponding strategy, wireless sensor network selects anti-interference method adaptively, thus while guarantee communication quality, farthest reduce the energy consumption of network, with optimized network performance.The method comprises the signal transmission power, switching channels etc. that increase nodes, and wireless body area network is mainly used in medical field is used as detection to human health information and monitoring, from the angle of human-body safety, need the transmitting power reducing body area network node, make the absorption of electromagnetic radiation rate SAR of human body meet the limit value of relevant laws and regulations; And can significant limitation be there is when switching channels is for solving the interference problem between adjacent body area network.
In Shanghai Communications University by the patent (application number: 201110087151.1) being called " based on game theoretic wireless sensor network to anti-disturbance method " accepted, from the performance of the transfer of data of network and the energy of communication node, in conjunction with game theoretic thought, realize reducing malicious interference damaged network, thus ensure the higher data transmission performance of sensor network under disturbed condition to a certain extent.The method needs the wireless senser monitoring node disposing some in the monitored area of sensor network equably, also require that nodes all in network is all actionless, but, use extra monitoring node correspondingly can increase the complexity solving interference problem between adjacent body area network; And most of sensor node is not fixed in wireless body area network.
The present invention is directed to the interference problem between the adjacent BANs being operated in same channel, in order to ensure the Performance And Reliability of BAN, propose a kind of technical method based on superframe active period interleaving techniques, solve other technologies and can not use or bring the problems such as too high energy ezpenditure for the treatment of during adjacent BANs interference because external condition cannot be met; By the superframe active period of staggered adjacent BANs, effectively can avoid the overlap of their active period, reduce the interference even eliminated between adjacent BANs, realizing BAN can share same operation channel with other one or more BANs; Substantially increase the utilance to network channel.
Summary of the invention
For the deficiencies in the prior art, propose a kind of under the consumption of guarantee network energy increases acceptable prerequisite, by the superframe active period of staggered adjacent body area network, reduce to greatest extent, and the interference problem may eliminated between the adjacent body area network of single channel, realize the wireless body area network coexistence method intersected based on superframe active period that many nets coexist, technical scheme of the present invention is as follows: a kind of wireless body area network coexistence method intersected based on superframe active period, and it comprises the following steps:
101, certain region memory is at a domain of individuals net BAN1, body area network BAN2 adds this region subsequently, and body area network BAN1 and body area network BAN2 is when being in adjacent position and being operated in same channel, selected body area network BAN1 is as main grid of reference, selected second body area network BAN2 adding this region is as secondary grid of reference, the health main website hub of note body area network BAN2, is designated as hub2, intercepts and resolves the current local zone time t of the acquisition body area network BAN1 of BAN1
1with superframe structure information, obtain the superframe symbol (SO) of body area network BAN1
1value;
102, read the body area network BAN2 current time, calculate the time t that current super frame beacon sends
2, pass through t
1and t
2calculate two networks send beacon frame time difference t in same beacon period, judge if so, then to jump to step 104, otherwise jump to step 103 time that the active period whether time difference t is less than the health main website hub1 of body area network BAN1 terminates, terminate; And judge the time that the inactive the phase whether time that the active period of the health main website hub2 of body area network BAN2 terminates be greater than hub1 terminates, if so, then jump to step 104, otherwise jump to step 103, terminate;
103, the hub2 of body area network BAN2 abandons the beacon frame of the body area network BAN1 received, and continues in the current beacon period length of body area network BAN2 and inactive cycling;
104, the time that the active period being less than the hub1 of body area network BAN1 as time difference t terminates, and during the time that the inactive phase that the time that the active period of the hub2 of body area network BAN2 terminates simultaneously is greater than hub1 terminates, the active period of body area network BAN1 and body area network BAN2 will overlap and produce interference, and the hub2 of body area network BAN2 builds superframe active period intersection claim frame and sends to hub1;
105, the hub1 of body area network BAN1 replys acknowledgement frame after receiving the superframe active period intersection claim frame of hub2 immediately, represents that confirmation receives request, resolves the content of this claim frame, and record identifier and the priority of body area network BAN2;
106, the hub1 of body area network BAN1 is according to self current beacon period and superframe length and inactive phase, judges whether to provide available superframe active period to intersect, namely judges
whether set up, wherein, SD
iand BI
ithe super-frame durations of difference representation node i and beacon interval, GTS representative protection time slot, N represents the adjacent body area network network number working in same channel, if set up, jumps to step 107, is false, jump to step 108;
107, the hub1 of body area network BAN1 informs to the hub2 transmission superframe active period cross response frame of body area network BAN2 the request accepting hub2, and jumps to step 109;
Then show when 108, being false that current beacon period length and inactive phase are not enough to provide available superframe active period to intersect, the priority of the BANs that other application superframe active period of the priority of body area network BAN2 and record are intersected compares by the hub1 of body area network BAN1, if the priority of BAN2 is comparatively large, then jump to step 107; If priority is less, the hub1 of body area network BAN1 sends to hub2 the request that superframe active period cross response frame informs refusal hub2, and the response that hub2 is receiving hub1 replys acknowledgement frame immediately, represents that confirmation receives response.After the content of resolution response frame, hub2 continues its current beacon cycle length and the inactive phase is normally run;
109, hub2 sends superframe active period cross response frame and informs the request accepting hub2.The response that hub2 is receiving hub1 replys acknowledgement frame immediately, represents that confirmation receives response.Resolve the content of this response frame, then, hub2 adjusts its beacon period border and inactive phase, and the superframe active period of asking to obtain it is intersected, and completes superframe active period and intersects.
Further, step 102 judges that the time formula that the active period whether time difference t is less than the hub1 of body area network BAN1 terminates is specially:
Judge that the time formula that the inactive the phase whether time that the active period of the hub2 of body area network BAN2 terminates be greater than hub1 terminates is specially:
Wherein t
1represent the time of the current transmission beacon frame of BAN1, NSS represents the timeslot number that superframe comprises, and BSD is the length of basic time slot, (SO)
1represent the superframe symbol of BAN1, (SO)
2represent the superframe symbol of BAN2, BI represents the beacon interval of BAN1.
Further, the hub1 of the body area network BAN1 in step 105 receives superframe active period and intersects after request, network enters jamming pattern, and hub1 takes following measures for this request: (a) record sends identifier and the priority of the BAN of superframe active period intersection request; (b) inquiry beacon period of own net and superframe length and inactive phase.
Advantage of the present invention and beneficial effect as follows:
(1) for the interference problem between BANs, adopt the solution based on superframe active period interleaving techniques, solve other technologies and can not use or bring the problems such as too high energy ezpenditure for reducing when adjacent BANs disturbs because external condition cannot be met, when being used for the interference problem solved between BANs as used channel switching techniques, when the quantity of channel glitch-free in network is less than the quantity of the BANs of existence or does not have idle channel, channel switches then no longer applicable;
(2) by the superframe active period of staggered adjacent BANs, effectively can avoid the overlap of their active period, reduce the interference even eliminated between adjacent BANs, realize BAN and can share same operation channel with other one or more BANs, and substantially increase the utilance to network channel.
Accompanying drawing explanation
Fig. 1 is the superframe structure schematic diagram under preferred embodiment of the present invention wireless body area network beacon patterns;
Superframe structure under wireless body area network beacon patterns is divided into active period (Active) and inactive phase (Inactive), active period is by beacon slot (Beacon), contention access stage (CAP) and non-competing access phase (CFP) are formed, BI is super-frame beacon interval, and SD is super-frame durations.
Fig. 2 is the overlapping schematic diagram of superframe active period of adjacent BANs;
Four adjacent networks working in same channel, there is overlapping interference with the superframe active period of BAN1 in the superframe active period of BAN2, BAN3, BAN4.
Fig. 3 is superframe active period interleaving techniques realization example figure;
Four adjacent networks working in same channel, each superframe active period achieves zero lap through superframe active period interleaving techniques.
Fig. 4 is that wireless body area network coexists and Solutions of Anti-jamming operational flowchart.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
The body area network network operation is divided into normal mode and jamming pattern.Under normal mode, body area network sensor node gathers, transmits the physiologic information of human body in real time, efficiently and carries out analyzing and processing, in net, all nodes normally work according to pre-configured networked communication resource, for completing the monitoring service to human body vital sign parameter.As the hub of body area network BAN2, be designated as hub2, when detecting overlapping with the active period of adjacent BAN, will interference be produced, then build superframe active period intersection claim frame, to the hub of body area network BAN1, be designated as hub1, send.After hub1 receives the request of superframe active period intersection, network enters jamming pattern.
Hub1 takes following measures for this request: (a) record sends identifier and the priority of the BAN of superframe active period intersection request; Beacon period (superframe) length and inactive phase of (b) inquiry own net.
If current beacon period (superframe) length and the inactive phase available superframe active period can be provided to intersect, then after hub1 receives request, send superframe active period cross response frame and accept this request.BAN and adjacent BAN is glitch-free be operated in same channel from the hub of BAN2 adjust it beacon period (superframe) border and the inactive phase obtain superframe active period that it asks intersects.
If current beacon period (superframe) length and the inactive phase be not enough to provide available superframe active period to intersect, the identifier of BAN to be applied for and priority are stored to and treat in request record by the hub of BAN1, and compare with the priority having recorded the BANs that other application superframe active period is intersected, decide to accept still to refuse this request.
If the priority of BAN2 to be asked is greater than the priority of applying for BANs, then hub1 sends superframe active period cross response frame and accepts this request.BAN and adjacent BANs is glitch-free be operated in same channel from the hub of the BAN sent request adjust it beacon period (superframe) border and the inactive phase obtain superframe active period that it asks intersects.
If the priority of BAN2 to be asked is less than the priority of applying for BANs, hub1 sends this request of superframe active period cross response frame reject.The BAN2 continuation of then asking superframe active period to be intersected and BAN1 run at same channel, and the transmission superframe active period request at interval.
If there is multiple adjacent BANs to need their superframe active period staggered, the request of superframe active period intersection will be sent to BAN1, the unusual condition if BAN1 network goes offline etc., the BAN network that need carry out superframe active period intersection by one serves as the role of master network, and the intersection that the BANs for other carries out superframe active period provides reference data.Other BANs then sends the request of superframe active period intersection to it.
After adjacent BANs interlocks their superframe active period, avoid the overlap of active period between different B ANs, reduce the interference even eliminated between BANs, each BAN gets back to normal mode.BAN can share same operation channel with other one or more BANs, achieve many nets and coexist.
Suppose the preferential BAN existed in specific region, select it as main grid of reference, selected second BAN adding this region is as secondary grid of reference, network all adopts hub-and-spoke configuration, each BAN is made up of three equipment (telegon and two terminal equipments), and they are operated in same channel.
Contrast accompanying drawing 4 below and describe flow chart of the present invention in detail, with reference to Fig. 4, step 1, when two BANs are in adjacent position and are operated in same channel, remember that first BAN is BAN1, another is BAN2; The hub of note BAN2, is designated as hub2, intercepts the beacon frame of BAN1, resolves beacon frame, obtains the local zone time t that BAN1 is current
1with superframe structure information, obtain its (SO)
1value.
Step 2, reads the time that BAN2 is current, calculates the time t that current super frame beacon sends
2, pass through t
1and t
2calculate two networks send beacon frame time difference t in same beacon period, by the hub of itself and BAN1, be designated as hub1, the time that active period terminates compares, and namely whether judgment formula (1) is set up.
The time that the inactive phase of the time that the active period calculating hub2 terminates and hub1 terminates compares, and namely whether judgment formula (2) is set up.
Wherein t
1represent the time of the current transmission beacon frame of BAN1, NSS represents the timeslot number that superframe comprises, and BSD is the length of basic time slot, (SO)
1represent the superframe symbol of BAN1, (SO)
2represent the superframe symbol of BAN2, BI represents the beacon interval of BAN1.
If formula (1) or formula (2) are set up, the active period of two BANs will overlap, thus cause producing interference between adjacent BANs.Now, hub2 builds superframe active period intersection claim frame and sends to hub1, to interlocking, for adjusting the beacon period of network of its request superframe active period; If are all false in formula (1) and (2), then interference can not be produced between two adjacent BANs, hub2 will abandon the beacon frame of the hub1 received, and two BANs continue current beacon period (superframe) length and inactive phase work.
Step 3, the superframe active period request that hub1 receives hub2 replys acknowledgement frame immediately, represents that confirmation receives request.Resolve the content of this command frame, and record identifier and the priority of BAN2.
Step 4, hub1 according to self (superframe) length and the situation of inactive phase current beacon period, and whether determine can provide available superframe active period to intersect, namely whether judgment formula (3) is set up.
Wherein, SD
iand BI
ithe super-frame durations of difference representation node i and beacon interval, GTS representative protection time slot.
If formula (3) is set up, then current beacon period (superframe) length and the inactive phase available superframe active period can be provided to intersect, hub1 sends superframe active period cross response frame to hub2 and informs the request accepting hub2.The response that hub2 is receiving hub1 replys acknowledgement frame immediately, represents that confirmation receives response.Resolve the content of this response frame, then, hub2 adjusts its beacon period (superframe) border and inactive phase, and the superframe active period of asking to obtain it is intersected.
If formula (3) is false, then current beacon period (superframe) length and the inactive phase be not enough to provide available superframe active period to intersect, then the priority of BANs that other application superframe active period of the priority of BAN2 and record are intersected by hub1 compares.
If the priority of BAN2 is comparatively large, then hub1 sends command frame and regains the inactive phase wherein having distributed to less BANs, and informs to hub2 transmission superframe active period cross response frame the request accepting hub2.The response that hub2 is receiving hub1 replys acknowledgement frame immediately, represents that confirmation receives response.Resolve the content of this response frame, then, hub2 adjusts its beacon period (superframe) border and inactive phase, and the superframe active period of asking to obtain it is intersected.Solve the interference problem between the adjacent BANs being operated in same channel thus, achieve many nets and coexist.
If the priority of BAN2 is less, then hub1 sends to hub2 the request that superframe active period cross response frame informs refusal hub2.The response that hub2 is receiving hub1 replys acknowledgement frame immediately, represents that confirmation receives response.After the content of resolution response frame, hub2 continues its current beacon cycle (superframe) length and the inactive phase is normally run.
Step 5, BAN1 and BAN2 works on when not staggered superframe active period same channel, after a period of time, when occurring to produce interference between adjacent BANs, proceeds to step 1.
These embodiments are interpreted as only being not used in for illustration of the present invention limiting the scope of the invention above.After the content of reading record of the present invention, technical staff can make various changes or modifications the present invention, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.
Claims (3)
1., based on the wireless body area network coexistence method that superframe active period is intersected, it is characterized in that, comprise the following steps:
101, certain region memory is at a domain of individuals net BAN1, body area network BAN2 adds this region subsequently, and body area network BAN1 and body area network BAN2 is when being in adjacent position and being operated in same channel, selected body area network BAN1 is as main grid of reference, selected second body area network BAN2 adding this region is as secondary grid of reference, the health main website hub of note body area network BAN2, is designated as hub2, intercepts and resolves the current local zone time t of the acquisition body area network BAN1 of BAN1
1with superframe structure information, obtain the superframe symbol (SO) of body area network BAN1
1value;
102, read the body area network BAN2 current time, calculate the time t that current super frame beacon sends
2, pass through t
1and t
2calculate two networks send beacon frame time difference t in same beacon period, judge if so, then to jump to step 104, otherwise jump to step 103 time that the active period whether time difference t is less than the health main website hub1 of body area network BAN1 terminates, terminate; And judge the time that the inactive the phase whether time that the active period of the health main website hub2 of body area network BAN2 terminates be greater than hub1 terminates, if so, then jump to step 104, otherwise jump to step 103, terminate;
103, the hub2 of body area network BAN2 abandons the beacon frame of the body area network BAN1 received, and continues in the current beacon period length of body area network BAN2 and inactive cycling;
104, the time that the active period being less than the hub1 of body area network BAN1 as time difference t terminates, and during the time that the inactive phase that the time that the active period of the hub2 of body area network BAN2 terminates simultaneously is greater than hub1 terminates, the active period of body area network BAN1 and body area network BAN2 will overlap and produce interference, and the hub2 of body area network BAN2 builds superframe active period intersection claim frame and sends to hub1;
105, the hub1 of body area network BAN1 replys acknowledgement frame after receiving the superframe active period intersection claim frame of hub2 immediately, represents that confirmation receives request, resolves the content of this claim frame, and record identifier and the priority of body area network BAN2;
106, the hub1 of body area network BAN1 is according to self current beacon period and superframe length and inactive phase, judges whether to provide available superframe active period to intersect, namely judges
whether set up, wherein, SD
iand BI
ithe super-frame durations of difference representation node i and beacon interval, GTS representative protection time slot, N represents the body area network network number of adjacent generation interference, if set up, jumps to step 107, is false, jump to step 108;
107, the hub1 of body area network BAN1 informs to the hub2 transmission superframe active period cross response frame of body area network BAN2 the request accepting hub2, and jumps to step 109;
Then show when 108, being false that current beacon period length and inactive phase are not enough to provide available superframe active period to intersect, the priority of the BANs that other application superframe active period of the priority of body area network BAN2 and record are intersected compares by the hub1 of body area network BAN1, if the priority of BAN2 is comparatively large, then jump to step 107; If priority is less, the hub1 of body area network BAN1 sends to hub2 the request that superframe active period cross response frame informs refusal hub2, and the response that hub2 is receiving hub1 replys acknowledgement frame immediately, represents that confirmation receives response.After the content of resolution response frame, hub2 continues its current beacon cycle length and the inactive phase is normally run;
109, hub2 sends superframe active period cross response frame and informs the request accepting hub2.The response that hub2 is receiving hub1 replys acknowledgement frame immediately, represents that confirmation receives response.Resolve the content of this response frame, then, hub2 adjusts its beacon period border and inactive phase, and the superframe active period of asking to obtain it is intersected, and completes superframe active period and intersects.
2. the wireless body area network coexistence method intersected based on superframe active period according to claim 1, it is characterized in that, step 102 judges that the time formula that the active period whether time difference t is less than the hub1 of body area network BAN1 terminates is specially:
Judge that the time formula that the inactive the phase whether time that the active period of the hub2 of body area network BAN2 terminates be greater than hub1 terminates is specially:
Wherein t
1represent the time of the current transmission beacon frame of BAN1, NSS represents the timeslot number that superframe comprises, and BSD is the length of basic time slot, (SO)
1represent the superframe symbol of BAN1, (SO)
2represent the superframe symbol of BAN2, BI represents the beacon interval of BAN1.
3. the wireless body area network coexistence method intersected based on superframe active period according to claim 1, it is characterized in that, the hub1 of the body area network BAN1 in step 105 receives superframe active period and intersects after request, network enters jamming pattern, and hub1 takes following measures for this request: (a) record sends identifier and the priority of the BAN of superframe active period intersection request; (b) inquiry beacon period of own net and superframe length and inactive phase.
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| PAOLO ROBERTO GRASSI, VINCENZO RANA, IVAN BERETTA, DONATELLA SCI: "B2IRS： a Technique to Reduce BAN-BAN Interferences in Wireless Sensor Networks", 《2012 NINTH INTERNATIONAL CONFERENCE ON WEARABLE AND IMPLANTABLE BODY SENSOR NETWORKS》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109768848A (en) * | 2019-04-01 | 2019-05-17 | 西安电子科技大学 | A kind of rapid answer communication mechanism based in time slot neighbors discovery agreement |
| CN110312313A (en) * | 2019-05-21 | 2019-10-08 | 河南科技大学 | Based on multi channel wireless body area network MAC protocol, communication means and system |
| CN110312313B (en) * | 2019-05-21 | 2023-04-07 | 河南科技大学 | Wireless body area network MAC protocol based on multiple channels, communication method and system |
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