CN105611557A - Internetwork interference avoiding method based on nested composite superframe structure - Google Patents
Internetwork interference avoiding method based on nested composite superframe structure Download PDFInfo
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- CN105611557A CN105611557A CN201610007274.2A CN201610007274A CN105611557A CN 105611557 A CN105611557 A CN 105611557A CN 201610007274 A CN201610007274 A CN 201610007274A CN 105611557 A CN105611557 A CN 105611557A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance
Abstract
The embodiment of the invention discloses an internetwork interference avoiding method based on a nested composite superframe structure. The method comprises the nested composite superframe structure, improved frame structures and a communication mechanism under the composite superframe. In adoption of the embodiment of the invention, the internetwork interference can be effectively avoided; and performances such as the packet loss probability and the throughput capacity can be improved.
Description
Technical field
The present invention relates to the communications field, relate in particular to interference avoidance method between the net based on nested compound superframe structure.
Background technology
In large population base and the more and more serious China of aging, for the human and material resources money of health care aspectSource worsening shortages, solves old man's health supervision problem in the urgent need to New Research Method. Wireless centered by human bodyBody area network by disposing in vivo, the sensor of body surface monitors the physical signs of human body in real time, and by the association in networkTune device is wireless sends remote terminal processing to, has avoided the impact of line on patient activity between equipment, the height of can yet be regarded asA kind of best solution of the disease of old people such as blood pressure, diabetes. In addition, its can also meet people to somatic sensation television game,The demand of the daily life aspects such as motion conditions monitoring. Therefore wireless body area network is in medical treatment support, health status monitoringWith field prospects in an increasingly wide range of applications such as consumer electronics, be subject to unprecedented attention.
Wireless body area network, as a kind of monitor-type technology of serving health, relates to life security, to reliabilityRequire harshlyer, and for the populous country of this class of picture China, between net, interference problem certainly will be more serious, because ofThis, be necessary to study between the net of body area network and disturb avoidance mechanism, the body territories such as especially Chinese home for destitute, hospital wardNet equipment uses the interference under collected state more to suppress problem.
Between the net based on physical layer, interference avoidance scheme mainly contains the schemes such as power control and frequency hopping at present, and based onThe scheme of MAC layer mainly contains networking plan between distributed or centralized net, and these schemes mostly exist to disturb and avoidThe problems such as mechanism effect is undesirable, wireless body area network number is limited, load is larger.
Summary of the invention
The object of the invention is to, for overcoming the defect of prior art, provide a kind of based on nested compound superframe structureNet between interference avoidance method.
Interference avoidance method between a kind of net based on nested compound superframe structure provided by the invention, is characterized in that:By abstract application scenarios for thering is the two-level network model of stelliform connection topology configuration, according to nested compound of this modellingThe structure of superframe, improvement associated frame, and provide the communication mechanism under this compound superframe.
Above-mentioned scene characteristic is: the network equipment such as home for destitute, hospital ward being similar under medical Internet of Things usesFor concentrated, network topology can abstractly be the application scenarios of two-level network framework.
For convenience of description, based on medical Internet of Things, the method is described below.
The above-mentioned two-level network aspect of model is:
The telegon of each wireless body area network is called to sub-telegon, and the beacon frame of its transmission is called sub-beacon frame. OftenBetween each node in individual wireless body area network and its sub-telegon, form secondary subnet, the sub-telegon of each networkAnd form primary subnet between chief coordinator's device. Between subnet not at the same level, it is transparent transmission.
Above-mentioned nested compound superframe structure comprises the competition of total beacon period, telegon phase, sub-beacon period, monopolizes access periods,Random access periods and non-competing phase. Total beacon period sends total beacon frame for chief coordinator's device to each sub-telegon. AssociationAdjust the device competition phase for competing sequence number by sending telegon competition frame with competition acknowledgement frame between sub-telegon. ShouldSequence number had both determined that sub-telegon sent the order of sub-beacon frame in sub-beacon period, had determined that again secondary subnet is in non-competingThe phase of striving obtains the situation of time slot: if in actual scene the number L of wireless body area network to be not more than non-competing interim son non-The number M of competition phase, all secondary subnets the non-competing phase all according to competition to order take the sub non-competing phaseCommunicate, if the number L of wireless body area network is greater than the number of non-competing interim non-competing phase of son in actual sceneM, only has competition to take the sub non-competing phase to the secondary subnet of sequence number 1 to M by numeric order, and other secondarysSubnet can not use any one sub non-competing phase. Sub-beacon period is pressed it for each sub-telegon of secondary subnetThe sequence number that arrives of competition is successively to the sub-beacon frame of its node broadcasts separately, and it comprises N sub-slots, N represent this twoThe wireless body area network quantity that level network can hold at most in certain limited physical space region. Above-mentioned frame knotStructure comprises total beacon frame, telegon competition frame, competition acknowledgement frame, sub-beacon frame, connection management frame. Total beacon frameIncrease group id field, a sub-beacon period initial time field and sub non-competing phase numeral on the basis of existing beacon frameSection, wherein organizing id field is the secondary subnet of this chief coordinator's device scheduling of reception and the group ID that chief coordinator's device forms;Sub-beacon period initial time field represents the time started of sub-beacon period; The son digital section of non-competing phase is that son is non-competingThe number of phase, its number is M, represents the non-competing phase in compound superframe to be divided into M sub non-competing phase,Under this mechanism, in each compound superframe, there is at most M secondary subnet can obtain the use of sub non-competing phase by competitionPower, General N is more than or equal to M. Telegon competition frame is optimized on the basis of existing acknowledgement frame immediately, has increased group IDField, competition acknowledgement frame is optimized on the basis of existing acknowledgement frame immediately, has increased group id field, competition sequence number wordSection, the implication of wherein organizing id field, with to organize id field implication in total beacon frame identical, competed sequence number field list and is shown sonThe sequence number that telegon is competed. Sub-beacon frame is optimized on the basis of existing beacon frame, uses MAC parameter whereinThe 1bit retaining in field is to represent whether this secondary subnet can take the non-competing phase in next superframe. ConnectManagement frames is optimized on the basis of existing connection management frame, increase the sub non-competing phase the zero hour field and son non-competingStrive field finish time phase, for representing start-stop moment of non-competing phase of this network.
Compared with prior art, the technology of the present invention advantage is:
Solution be similar to the network equipment such as home for destitute, hospital ward use comparatively concentrate, network topology can abstractly be twoInterference problem between the net under level network architecture situation, the method can be avoided disturbing between net effectively, improve packet loss,The performances such as handling capacity.
Brief description of the drawings
Fig. 1 is two-level network topological diagram;
Fig. 2 is the nested compound superframe structure based on two-level network;
Fig. 3 is the frame structure of total beacon frame;
Fig. 4 is the frame structure of telegon competition frame;
Fig. 5 is the frame structure of competition acknowledgement frame;
Fig. 6 is the frame structure of sub-beacon frame;
Fig. 7 is the frame structure of connection management frame;
Fig. 8 is each secondary subnet channel occupancy situation schematic diagram;
Fig. 9 is the communication process under nested compound superframe structure.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is described in detail.
Example of the present invention provides between a kind of net based on nested compound superframe structure and has disturbed avoidance mechanism.
Example of the present invention by abstract application scenarios for thering is the two-level network model of stelliform connection topology configuration, according to this modelDesign nested compound superframe structure, and provide the communication mechanism under this structure.
Between the net can effectively avoid multiple networks to share same channel by example of the present invention time, disturb, improve packet lossThe performance such as rate, handling capacity, in improving the reliability of network, the user who improves product experiences.
Example of the present invention is mainly to propose solution for being similar to this class application scenarios such as home for destitute, hospital ward,It generally all can be at indoor deployment and the similar chief coordinator's device of coordinator function. The embodiment of the present invention is intended utilizing this always to assistAdjust the telegon of each network of device United Dispatching, and use channel resource by the mode of vying each other between telegon,Thereby coordinate the time of each network busy channel, reach the object of avoiding interference between net.
The two-level network topological structure building based on this class scene such as home for destitute recreation room, hospital ward as shown in Figure 1.For ease of describing, the telegon of each network is called to sub-telegon, the beacon frame of its transmission is called sub-beacon frame.Wherein, between each node in each network and its sub-telegon, form secondary subnet, the son of each secondary subnetBetween telegon and chief coordinator's device, form primary subnet. Between subnet not at the same level, it is transparent transmission.
Chief coordinator's device determines the beginning and ending time in compound superframe and each period thereof, and coordinates each secondary subnet and take letterThe time in road and order. Can each secondary subnet in non-competing phase busy channel and take order and all coordinate by sonBetween device vie each other and by the final decision of chief coordinator's device.
Two-level network forms nested compound superframe structure as shown in Figure 2. Wherein total beacon period, telegon competitionPhase is for the communication of primary subnet, sub-beacon period, monopolizes access periods, random access periods, non-competing phase for secondaryThe communication of subnet. The non-competing phase is divided into the non-competing phase of multiple sons by the embodiment of the present invention, then by sub-telegon rootIn primary subnet, compete the order arriving according to it, non-competing certain height phase is distributed to the joint in secondary subnet under itPoint, all secondary subnet internal nodes are all competed to use in CSMA/CA mode and are monopolized access periods and connect at random simultaneouslyEnter the phase, complete respective communication.
For convenience of description, example of the present invention will be introduced the communication of this two-level network based on IEEE802.15.6 agreementMechanism, changes associated frame taking field as unit, transfer portion in frame assumption diagram with italic and shadow representation,And remainder all adopts IEEE802.15.6 protocol communication. The change of doing under this mechanism is equally applicable to 4n/4jDeng the frame structure of other body area network standards.
Total beacon period sends total beacon frame for chief coordinator's device to each sub-telegon, its frame structure as shown in Figure 3,Wherein, the group ID that secondary subnet and the chief coordinator's device that group id field is this chief coordinator's device scheduling of reception forms; SonBeacon period initial time field represents the time started of sub-beacon period; The son digital section of non-competing phase is the sub non-competing phaseNumber, its number is M, represents the non-competing phase in compound superframe to be divided into M sub non-competing phase, shouldIn the lower each compound superframe of mechanism, there is at most M secondary subnet by competing the right to use that can obtain the sub non-competing phase,General N is more than or equal to M, and N represents that this two-level network can hold at most in certain limited physical space regionWireless body area network quantity, determine the sub-slots number of sub-beacon period according to this N value.
The telegon competition phase is competed sequence number between sub-telegon. This sequence number had both determined that sub-telegon was in sub-beaconPhase sends the order of sub-beacon frame, has determined that again secondary subnet obtains the situation of time slot in the non-competing phase. During this period,Sub-telegon, chief coordinator's device send respectively the embodiment of the present invention according to the existing frame (Disconnectframe) that disconnectsThe brief telegon competition frame (HubContendframe) of design, competition acknowledgement frame (ContendAckframe).The frame structure of these two kinds of frames as shown in Figure 4, Figure 5, wherein, comprises competition sequence number in the frame of competition acknowledgement frame(ContendSequenceNumber) field, represents the sequence number that sub-telegon is competed.
The sequence number that sub-beacon period arrives by its competition for each sub-telegon of secondary subnet is successively to its joint separatelyThe sub-beacon frame of some broadcast. Wherein, in MAC parameter (MACCapability) field in IEEE802.15.6 agreementOriginally reserved not use of 4bit field, embodiment of the present invention utilization 1bit wherein represents that this secondary subnet is at the next oneIn superframe, whether can take the non-competing phase. Owing to being transparent transmission between subnet not at the same level, the joint in secondary subnetPut and do not know the time distribution condition of primary subnet layer about compound superframe, only by the son of its sub-telegon transmissionBeacon frame obtain each access period beginning and ending time, therefore in sub-beacon frame, still comprise random access periods initial time,Random access periods two fields finish time, and the value of field is identical with the value of the corresponding field in total beacon frame, butIn sub-beacon frame, do not need to inform the node start-stop time slot of non-competing phase of son, because node is non-competing interim in competitionWhen time slot, only apply for required slot length, and concrete time slot arrangement is completed by sub-telegon. Arrive order for competitionThe secondary subnet of number i, its non-competing phase initial time, non-competing finish time phase are respectively as shown in formula (1) (2):The length (1) of i the sub non-competing phase initial time=random access periods finish time+(i-1) × every non-competing phase of heightThe length (2) of i the sub non-competing phase finish time=random access periods finish time+i × every non-competing phase of height
Wherein when competition is non-competing to sub-telegon application in random access periods to interior certain node of secondary subnet of sequence number iWhile striving the time slot of interim uploading data, sub-telegon is by connection management frame (connect as shown in Figure 7Assignmentframe) for it arranges i the non-competing interim time slot of son, non-if this node obtains i sonM to a n time slot in the competition phase, sub-telegon is by the time period initial time in this connection management frame(IntervalStart) the non-competing phase start-stop time slot that field, finish time time period, (InternalEnd) field was its distributionComputing formula be respectively:
Time period initial time=the i sub non-competing phase initial time+m (3)
The time period finish time=the i sub non-competing phase initial time+n (4)
Although the non-competing phase is divided into M sub non-competing phase by the embodiment of the present invention, competing by between sub-telegonStrive and distribute to respectively M secondary subnet use, but the embodiment of the present invention no longer continues to be divided into son to random access periodsThe competition phase, but allow the node of all secondary subnets compete at this random access periods simultaneously, improve on the one hand channel profitBy rate, the communication requirement of each secondary subnet of As soon as possible Promising Policy on the other hand. This is because random access periods is mainly usedIn the communication requirement that meets node and have randomness, those secondary subnets that competition is less than M value to sequence number are connecing at randomEnter the communication requirement amount of phase little, and for competition to sequence number be greater than M value those secondary subnets because of not havingCompetition, to non-competing phase time slot, therefore needs to utilize this stage competition uploading data.
The sequence number that secondary subnet was competed in the telegon competition phase has determined the situation of its busy channel in superframe,Determine its in sub-beacon period, send the order of sub-beacon frame and non-competing interim whether can take son non-competingPhase, if can take, determine to take the non-competing phase of which height simultaneously. During due to IEEE design body area network agreementThe instructions for use of setting is for meeting 62Under m, 20 people use, and narrow band channel in IEEE802.15.6 agreement has 8Individual, what wherein meet Chinese medical body area network frequency range use regulation has 3, shares so secondary of same channelNet number is at most also with regard to 8, and the embodiment of the present invention is only considered to disturb between the net in common road. For considering ordinary circumstance, underFace is with secondary subnet quantity L=8, and each secondary subnet to have 6 nodes be that example provides different secondary subnets sameThe situation of busy channel in individual superframe. Suppose that the multipotency in this region holds secondary subnet quantity N=10, sub non-competing phaseQuantity M=5, that is to say that 8 secondary subnets only have 5 can compete non-competing interim time slot. In Fig. 8Dash area represents that secondary subnet can be at busy channel in this in period, and blank parts represents that it can not busy channel, locatesIn resting state. The communication process of secondary subnet under nested compound superframe mechanism as shown in Figure 9.
Network, in the time initializing, is first intercepted channel by each sub-telegon. When each sub-telegon received chief coordinatorAfter total beacon frame that device sends at the initial time of each compound superframe, synchronize with chief coordinator's device, and obtain compound superThe beginning and ending time information in frame and each period thereof, adjusts self superframe structure, in the time that the compound superframe of the next one arrives,According to the set of time access channel of total beacon frame. Group telegon is received after next total beacon frame, is entered immediatelyThe telegon competition phase. During this period, sub-telegon sends telegon competition in CSMA/CA mode to chief coordinator's deviceFrame, in order to the sequence number of contention access channel. Chief coordinator's device is received after this telegon competition frame, replys competition acknowledgement frame,And competition sequence number field is wherein set to the sequence number that this secondary subnet is competed, for the ease of understanding and describing,Here the value that hypothesis replies to secondary subnet i is i, and secondary subnet 1 to secondary subnet 8 compete the sequence number arriving and distinguishedBe 1 to 8. Meanwhile, because may leaving this chief coordinator's device at any time, the secondary subnet connecting with chief coordinator's device coversThe region of lid, for the secondary subnet of avoiding having left holds over the corresponding time slot of sequence number, causes wanting and total associationThe new secondary subnet of adjusting device to connect cannot obtain time slot, and the embodiment of the present invention specifies that each secondary subnet usesThe duration of this sequence number is S compound superframe, and S that secondary subnet starts to this sequence number in application is compound superIn frame, all use this sequence number as the order that uses channel, such as secondary subnet 1 is equal in an ensuing S superframeUse sequence number 1.
To arrive the secondary subnet 1 of sub non-competing phase with competition and not compete the secondary subnet 6 of sub non-competing phase belowFor example is described in detail in the communication mechanism under this nested compound superframe structure.
(1) communication process of secondary subnet 1
Secondary subnet 1 was competed after sequence number in the telegon competition phase, and the time of setting according to total beacon frame enters son letterThe mark phase. Due to secondary subnet 1 competition to sequence number be 1, therefore sub-telegon in next sub-beacon period the 1stSub-slots is broadcasted sub-beacon frame. As time goes on the sequence number of competing due to each sub-telegon can change,Therefore the node of all secondary subnets all starts to monitor sub-beacon frame at the initial time of sub-beacon period, to save separatelyPoint telegon accurate synchronization with it.
Node is received after this sub-beacon frame, synchronizes with sub-telegon, obtains the arrangement of time of secondary subnet, and is connecingReceive after the sub-beacon frame of next superframe and enter immediately and monopolize access periods. Monopolize access periods for sending high priorityEmergency alarm data, if contain this type of Frame in the buffer memory of node or sub-telegon, will be respectively withThe mode of CSMA/CA sends to the other side each other.
When arriving after the initial time slot of random access periods, node is communicated by letter in CSMA/CA mode, and according to secondaryWhether net can take non-competing phase decision and send management frames or Frame in this superframe. Due to secondary subnet 1Node can be at the 1st the non-competing phase busy channel of son, therefore management frames is uploaded in its competition in random access periods,For asking it at the 1st the non-competing interim time slot of monopolizing channel of son. Sub-telegon receives after this request, returnsMultiple corresponding management frames is distributed the 1st the non-competing interim time slot of son for it.
Each node in secondary subnet 1 is competed the slot length of non-competing phase according to the communication requirement of each nodeDifference and have nothing in common with each other, and exist some nodes do not compete time slot or son non-competing interim time slot not by completeFull situation of distributing. 6 nodes (node 1-node 6) SEPARATE APPLICATION of supposing secondary subnet 1 is to as shown in Figure 8 theThe time period of 1 non-competing interim dash area of son, non-competing interim at the 1st son of the compound superframe of the next one,6 nodes are respectively at corresponding time slot to sub-telegon uploading data frame, and the 1st the non-competing interim blank parts of son representsBecause the communication requirement of node is less, this part time slot is not assigned with away, therefore do not have node at this moment between section logicalLetter. From total beacon period of 5 non-competing phases of son of the 2nd non-competing phase to the of son and back to back next superframe,The telegon competition phase, the node in secondary subnet 1 will be in resting state, extensive during back to back sub-beacon periodAgain for thereby active state receives next sub-beacon frame.
Secondary subnet 2, to the communication process of the similar secondary subnet 1 of secondary subnet 5, repeats no more. Should be noted thatBe, in 6 nodes of secondary subnet 2, only have 5 nodes to compete the 2nd the non-competing interim time slot of son,Therefore in the time that next superframe arrives, only have 5 nodes in the 2nd the non-competing phase uploading data of son, competition is not thenThe random access periods at next superframe is continued competition slot by the node of gap.
(2) communication process of secondary subnet 6
If the sequence number that sub-telegon was competed in the telegon competition phase is greater than M, sub-telegon can only be in sub-beacon periodCorresponding sub-slots broadcast beacon frame, and can not be at non-competing interim busy channel. Telegon as sub-in secondary subnet 6The sequence number of competing in the telegon competition phase is 6, its by the 6th sub-slots in sub-beacon period to its node broadcastsBeacon frame, in the MAC of sub-beacon frame parameter field, the non-competing phase of identification nodes in this superframe can not account for simultaneouslyUse channel. Secondary subnet 6 is in total beacon period, telegon competition phase, the communication process of monopolizing access periods and secondaryNet 1 is identical. Therefore, this trifle is mainly discussed the communication process in other periods. The node of secondary subnet 6 is believed from sonThe initial time slot of mark phase starts to intercept channel, prepares to receive the sub-beacon frame of its sub-telegon broadcast, when node receivesTo sub-beacon frame and know after the message that there is no available channel in the non-competing phase, just do not send management at random access periodsFrame, and the data of node collection are directly uploaded to son with form of data frames by CSMA/CA mode in this stageTelegon. From the non-competing phase, node is in resting state, until the initial time slot of next sub-beacon period.
The communication process of secondary subnet 7, the similar secondary subnet 6 of secondary subnet 8, also repeats no more.
In addition, in this superframe, there are some subnets not compete the sequence number that (comprises border) between 1 to M, and itsHis competition to the subnet of sequence number in this interval at any time may the channel of S superframe time be recovered owing to using orInitiatively abandon the channel right to use, therefore for improving channel utilization and making not compete secondary of sequence number in this intervalNet obtains the channel right to use as early as possible, and this programme does not allow it wait for S superframe, but the direct coordination at follow-up superframeThe device competition phase is continued competition sequence number that may be released, that do not used, until competition (is wrapped between 1 to MContaining border) sequence number, then communicate according to the mode of secondary subnet 1, otherwise will communicate by letter in current mode always.
Although the background of institute of the present invention extracting method based on medical Internet of Things proposes, be applicable to scene and be not only confined to this,All be applicable to adopting this method to avoid dry between net as long as can take out the scene of stelliform connection topology configuration two-level network frameworkDisturb. Therefore, the foregoing is only a specific embodiment of the present invention, be not intended to limit protection of the present inventionScope. It will be understood by those of skill in the art that not departing under the prerequisite of inventive principle, to technology of the present inventionScheme is modified or is equal to replacement, does not depart from the spirit and scope of technical solution of the present invention, and it all should be containedIn protection scope of the present invention.
Claims (7)
1. an interference avoidance method between the net based on nested compound superframe structure, is characterized in that, described sideMethod is: by abstract the scene of research for thering is the two-level network model of stelliform connection topology configuration, based on this two-level networkModel obtains nested compound superframe structure and the frame structure of optimization, then frame based on compound superframe structure and optimizationStructure communicates;
Wherein, described research scene is centralized scene. And centralized scene comprises: medical Internet of Things supportOld institute or hospital ward etc.;
Described nested compound superframe structure comprises total beacon period, telegon competition phase, sub-beacon period, monopolizes accessPhase, random access periods and non-competing phase.
The frame structure of described optimization comprises: total beacon frame, telegon competition frame, competition acknowledgement frame, sub-beacon frame,Connection management frame.
2. the method for claim 1, is characterized in that, described two-level network model is: by one-levelThe telegon of subnet is as chief coordinator's device, and the telegon of each secondary subnet is as sub-telegon. By chief coordinator's deviceThe beacon frame sending is called total beacon frame, and the beacon frame that sub-telegon sends is called sub-beacon frame;
Between each node in each secondary subnet and sub-telegon, form secondary subnet, each secondary subnetBetween sub-telegon and chief coordinator's device, form primary subnet, and then obtain two-level network model;
Wherein, between two-stage subnet, be transparent transmission.
3. the method for claim 1, is characterized in that, described total beacon period for chief coordinator's device toEach sub-telegon sends total beacon frame. Described total beacon frame is to optimize on the basis of existing beacon frame, increasesGroup id field, sub-beacon period initial time field and the sub digital section of non-competing phase.
4. the method for claim 1, is characterized in that, the described telegon competition phase coordinates for sonBetween device, compete sequence number. Sub-telegon sends telegon competition frame to chief coordinator's device, and chief coordinator's device is to sub-telegonReply competition acknowledgement frame. Described telegon competition frame is to disconnect frame design according to existing, existing true immediatelyThe basis of recognizing frame has increased group id field. Described competition acknowledgement frame is to disconnect frame design according to existing,Group id field, competition sequence number field on the basis of existing acknowledgement frame immediately, are increased.
5. the method for claim 1, is characterized in that, described sub-beacon period is for secondary subnetThe sequence number that arrives by its competition of each sub-telegon successively to the sub-beacon frame of its node broadcasts separately. Described son letterMark frame is to optimize on the basis of existing beacon frame, use the 1bit that retains in MAC parameter field wherein withRepresent whether this secondary subnet can take the non-competing phase in next superframe.
6. the method for claim 1, is characterized in that, competition is to the secondary of non-competing interim time slotSubnet sends management frames in described random access periods, and competition is not to the secondary subnet of non-competing interim time slot in describedRandom access periods sends Frame.
7. the method for claim 1, is characterized in that, the described non-competing phase is non-competing by some sonsPhase composition, the start-stop moment of sub non-competing phase is determined by connection management frame. Described connection management frame is in existing connectionOn the basis of management frames, optimize, increase sub non-competing zero hour phase field and sub non-competing finish time phase field.
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