CN105704821A - Channel mapping based MAC protocol of multi-channel distribution method - Google Patents
Channel mapping based MAC protocol of multi-channel distribution method Download PDFInfo
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- CN105704821A CN105704821A CN201610207355.7A CN201610207355A CN105704821A CN 105704821 A CN105704821 A CN 105704821A CN 201610207355 A CN201610207355 A CN 201610207355A CN 105704821 A CN105704821 A CN 105704821A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a channel mapping based MAC protocol of a multi-channel distribution method and aims to solve a technical problem that a prior MAC protocol for multi-channel distribution is large in access time delay and severe in node energy consumption. The concrete implementation steps include adding channel status domains in WBAN beacon frames, wherein 0 or 1 is used for indicating the channel states performing mapping on the channel state domain and the channel serial numbers and using 0 or 1 for marking channel states in the domain; randomly selecting an available channel and switching to said channel after the channel state domain is analyzed by a node with arrived service; then performing carrier wave sensing; starting communication if the to-be-switched channel is still available while staying in the to-be-cut channel for keeping off and waiting or randomly selecting a channel again until a message is sent successfully if the to-be-switched channel is not available. By applying the channel mapping based MAC protocol of the multi-channel distribution method provided by the invention, channel interference in a wireless body area network can be relieved; at the same time, network handling capacity, time delay and energy consumption decrease performance can be improved. The invention can be used for enhancing medical service transmission quality and reliability.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of multi-channel medium and access control (MAC, MediaAccessControl) agreement, it is specifically related to one and is applied to wireless body area network (WBAN, the MAC protocol of the multi-channel allocation method mapped based on channel WirelessBodyAreaNetwork), the channel disturbance of medical profession transmission in WBAN can be alleviated, reduce data transmission delay and energy expenditure simultaneously, can be used for strengthening medical profession transmission q&r。
Background technology
In recent years, along with consciousness and the demand of health service are increased by people day by day, more and more advanced technology are applied in medical treatment, and WBAN can provide the user the health care of convenient and efficient, personal entertainment service, has vast potential for future development。Owing to WBAN node is by the restriction of size, power supply, horsepower requirements is harsh, medical profession data transmission delay is had more harsh requirement。But, it is applied to that channel disturbance that the single channel MAC protocol of WBAN exists, time delay be big at present, energy consumption and the problem such as collision is serious, causes that message cannot successfully be transmitted in time。Research worker proposes some based on multi channel MAC protocol in succession for improving the performance of network。In multi-channel MAC protocols, method for channel allocation is particularly significant, and it decides how to select corresponding channel for the whole network node, to ensure the network performance of the best。
The multi-channel allocation method of the multi-channel protocol being applied to WBAN at present is varied, as based on time slot mapping, time division multiple acess (TDMA, or carrier sense multiple, or the table that each maintenance package of communicating pair is containing channel status TimeDivisionMultipleAddress)。Lee and Rhee et al. proposes a kind of multichannel distribution mechanism based on time slot mapping, but this agreement does not provide the coordination mode that inter-nodal channel selects and accesses, and the access delay of node is also bigger；IsmailKirbas et al. proposes a kind of multichannel distribution mechanism based on TDMA, this mechanism using node clustering and select an ordinary node coordinate as focal point bunch interior nodes channel distribution, extra coordination of tasks can aggravate the energy expenditure of this focal point；Equally, the list that Kim et al. proposes maintains method, utilizes Markov even to predict channel status according to channel status before, but the deficiency that this agreement yet suffers from is that ordinary node wants real-time update channel status list so that it is energy expenditure is serious。
To sum up, the MAC protocol of the multichannel of the existing WBAN of being applied to distribution can bring node access delay big, the problem that energy expenditure is serious, and does not take into account the priority character of emergency medical service in WBAN so that network performance when these agreements are applied to WBAN is not good。
Summary of the invention
It is an object of the invention to the defect overcoming above-mentioned prior art to exist, propose the MAC protocol of a kind of multi-channel allocation method mapped based on channel, for solving the technical problem that access delay is big and node energy consumption is serious existed in the MAC protocol of existing multichannel distribution。
The technical thought of the present invention is: WBAN is operated under super frame mode, focal point sends the beacon frame comprising the information such as synchronization when superframe starts, the present invention with the addition of channel state field within a beacon frame, in this domain each binary digit is mapped to numbered channel。After channel status is scanned in focal point, successively channel status being labeled in channel state field, wherein " 0 " represents that channel can be used, and " 1 " represents that channel busy is unavailable。After ordinary node receives beacon frame, resolve the channel number that in this territory, each binary digit is mapped, obtain the frequency range of available channel according to the channel number being labeled as 0。There is the node that business arrives to first pass through random fashion and select available channel, then carrier sense, if channel is still idle, then start communication；Otherwise rest on present channel with certain probability keep out of the way wait or jump to other channels, until message Successful transmissions。
According to above-mentioned technical thought, it is achieved the technical scheme that the object of the invention adopts, comprise the steps:
Step 1, adds channel state field in the beacon frame of WBAN, obtains indicating the beacon frame of channel status, and wherein the binary digit 0 in this territory represents that channel idle can be used, and 1 represents that channel busy is unavailable；
Step 2, the binary digit of the channel state field in the beacon frame obtained from left to right is mapped from small to large with channel number, and according to the scanning result to channel status of the focal point in WBAN, in channel state field, each channel status is labeled by 0 or 1；
Step 3, ordinary node in WBAN receives the beacon frame indicating channel status sent from focal point, resolve the channel state field of this frame, learn the channel number that each binary digit is mapped, and according to the mapped channel number of the binary digit being labeled as 0 in channel state field in this beacon frame, obtain available channel；
Step 4, the ordinary node in WBAN determines whether that business arrives, and if so, then performs step 5；Otherwise perform step 9；
Step 5, the ordinary node in WBAN randomly chooses the available channel of acquisition, and switches to this channel；
Step 6, the channel that the ordinary node carrier sense in WBAN switches, it is judged that whether this channel is still idle available, if so, then performs step 8, otherwise performs step 7；
Step 7, the ordinary node in WBAN is according to the User Priority probability for its setting, it may be judged whether rest on the channel switched, and if so, then keeps out of the way waiting until that channel is again idle according to the carrier sense mechanism having conflict avoidance, performs step 8, otherwise performs step 5；
Step 8, in WBAN, ordinary node starts to communicate with focal point；
Step 9, ordinary node and focal point sign off or entrance resting state in WBAN。
The present invention compared with prior art, has the advantage that
1, due to the fact that the method that channel maps that have employed when selecting available channel, node can pass through channel mapping relations and select channel, decrease the channel idle time of intercept of node, compared with prior art, significantly reduce the access delay of data transmission and the energy expenditure of node, improve the handling capacity of network。
2, due to the fact that and be provided with corresponding User Priority probability according to node users priority, the business urgency level considering WBAN interior joint different priorities is different, compared with existing protocol, it is effectively improved the reliability of channel distribution, simplifies internodal interaction。
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the present invention；
Fig. 2 is the structural representation of beacon frame in the present invention；
Fig. 3 is the topology diagram that the present invention emulates use；
The performance comparison figure that Fig. 4 is the present invention to be increased along with interstitial content with the handling capacity of IEEE802.15.6；
The performance comparison figure that Fig. 5 is the present invention to be increased along with interstitial content with the time delay of IEEE802.15.6。
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail。
With reference to Fig. 1, the present invention comprises the steps:
Step 1, adds channel state field in the beacon frame of WBAN, and this territory is added on the end of beacon frame structure, can select retain or remove this territory according to concrete application。The big I of channel state field is set to 1 byte or multibyte according to concrete application, and the concrete structure of beacon frame is with reference to Fig. 2。Binary digit 0 in this territory represents that channel idle can be used, and 1 represents that channel busy is unavailable, obtains indicating the beacon frame of channel status。
Step 2, the frequency band of the one fixed width Centroid in WBAN and ordinary node communication used in advance is in turn divided into the channel of equal wide from small to large, and these channels are sequentially carried out numbering。The binary digit of the channel state field in the beacon frame obtained from left to right is mapped from small to large with channel number。First focal point in WBAN and node scan channel status around before a communication, after having scanned, learn which channel can be used, in this domain each channel status is labeled by 0 or 1, namely in this domain to the channel that the free time is available being labeled as 0 by the binary digit of channel number, it is labeled as 1 for busy disabled channel；
Step 3, ordinary node in WBAN receives the beacon frame indicating channel status sent from focal point, resolve the channel state field of this frame, learn the channel number that each binary digit is mapped, by 0 and 1 in each binary digit of channel state field, and according to the rule in step 1, learn the mapped channel number of binary digit being labeled as 0, obtain available channel；
Step 4, after the ordinary node in WBAN learns available channel, it is judged that whether business arrives for it, if there being data to need to be sent to focal point, then performing step 5, otherwise performing step 9；
Step 5, has the ordinary node that business arrives to randomly choose an available channel in all available channels, and switches to this channel；
Step 6, ordinary node in WBAN is after switching to selected channel, current channel is not necessarily still idle, it is likely to be chosen by other nodes and communicate, so first selected channel was carried out carrier sense by this node before communicating with focal point, if snoop results is channel, the still free time is available, then perform step 8, namely start the communication process with focal point, otherwise perform step 7；
Step 7, ordinary node in WBAN rests on present channel according to the User Priority probability for its setting, probit setting principle, with reference to table 1, then according to have the carrier sense mechanism of conflict avoidance to keep out of the way wait until that channel is again idle, otherwise randomly chooses available channel again。If again randomly choosing available channel, perform step 4；
Step 8, in WBAN, ordinary node starts to focal point to send relevant control frame and data frame traffic。
Step 9, ordinary node and focal point sign off, data Successful transmissions in WBAN, it does not have the node of data transmission then enters resting state。
With reference to Fig. 2, beacon frame structure of the present invention, based on super frame mode, namely sets up time base for benchmark with the time, and it is divided into superframe the label of equal length the time, focal point starts to send beacon frame at superframe, enters exclusive access phase, accidental access stage afterwards in order。Wherein exclusive access phase is the stage that transmission urgency traffic is reserved, and accidental access stage refers to that node accesses in a random way。There is sender address in the territory comprised in beacon frame, beacon length, distribution slot length and two stages in stage start over the time etc., the channel state field separately newly increased, this territory size is variable, this territory of illustrating in figure is 1 byte, territory includes 8 binary digits, each binary digit maps to a channel number, the channel that each channel number divides with WBAN used band is corresponding, marking whether channel can be used with 0 or 1, the example in figure shows that channel number is that 1,2 and No. 5 channel idle can be used。
With reference to table 1, the present invention is setting corresponding User Priority probability according to User Priority, and definition and the Business Name of each priority are as shown in the table。This probability is the probability whether ordinary node selects to remain in present channel, and probability is more big, it was shown that this node more likely rests on present channel, and otherwise node then reselects channel and switches to selected channel。Wherein the design principle of this probability is that the User Priority probit that User Priority is more high is more big, and even current business is relatively more urgent, then rest on present channel, because switching channel may bring bigger time delay again。
Table 1 User Priority probability parameter
Below in conjunction with emulation experiment, the technique effect of the present invention is further described。
1. simulated conditions and content
Simulated conditions: adopt Eclipse platform, the WBAN network of emulation adopts star topology, and this topological structure is as it is shown on figure 3, the available channel in emulation is to randomly select in all channels of network, and concrete simulation parameter is arranged as shown in table 2。The variable of emulation is the ordinary node number having business, is increased to 20 sights simulating in live network by 1。
Emulation content: the performance comparison that the handling capacity of the present invention Yu IEEE802.15.6 is increased by (1) along with interstitial content emulates, and its result is as shown in Figure 4；(2) performance comparison that the time delay of the present invention Yu IEEE802.15.6 is increased along with interstitial content emulates, and its result is as shown in Figure 5。
With reference to Fig. 3, present invention emulation only simulates a WBAN, and this network is stelliform connection topology configuration, including a focal point, represents with H, and 20 ordinary nodes, represents with N。
With reference to table 2, the present invention emulates set parameter and value is as follows:
Table 2 simulation parameter
| Parameter | Value |
| Channel transmission rate | 971.4Kbps |
| Superframe length | 1s |
| Beacon frame size | 15bytes |
| Message transmission rate | 160Kbps |
| Channel number | 10 |
| Number of available channels | 4 |
2. analysis of simulation result
With reference to Fig. 4, abscissa represents the quantity of ordinary node, and vertical coordinate represents the Normalized throughput of network。The curve Normalized throughput simulation result curve for obtaining according to existing WBAN standard IEEE 802.15.6 indicated with black square in Fig. 4, the simulation result curve of the Normalized throughput that the curve indicated with bullet obtains for using the present invention。
As can be seen from Fig. 4, when the curve indicated with square utilizes existing WBAN standard IEEE 802.15.6, the Normalized throughput of network is less, peak when nodes is 5, when the curve indicated with bullet uses the present invention to transmit data, network throughput always apparently higher than contrast agreement, nodes be when 8 maximum。Its reason is, the frequency spectrum resource in IEEE802.15.6 is limited, and under similarity condition, multiple channels can alleviate the competitive pressure in single channel and balanced traffic to multiple channels, plus efficient channel selection strategies so that the collision in channel also greatly reduces。So, the present invention can increase network throughput。
With reference to Fig. 5, abscissa represents the quantity of ordinary node, and vertical coordinate represents node access delay, and unit is the second。The curve indicated with black square in Fig. 5 for for according to the existing WBAN standard IEEE 802.15.6 time delay simulation result curve obtained, the time delay simulation result curve that the curve indicated with bullet obtains for using the present invention。
When the curve indicated with black squares as can be seen from Fig. 5 uses existing standard IEEE802.15.6 to transmit data, time delay increases substantially along with interstitial content, when the curve indicated with bullet uses the present invention to transmit data, time delay increases slowly, and its value is consistently less than contrast agreement。The times to be transmitted such as its reason is, the single channel agreement competitive pressure that IEEE802.15.6 adopts is big, business are long, and the possibility in addition collided is big, further increases service access time delay；And multi-channel protocol proposed by the invention can effectively alleviate competitive pressure, making business be dispersed to each transmission, the proud quick transmission of message, time delay reduces, and node idle listening time and collision probability reduce, and corresponding energy consumption also can reduce。So, the present invention can reduce access delay and energy consumption, improves the performance of communication network。
Emulation shows, the present invention can improve the handling capacity of network, reduces the access delay of node so that medical data is able to the probability of timely Successful transmissions and increases；The energy expenditure of ordinary node can being reduced simultaneously, thus adapting to the requirement of the extremely low power dissipation of WBAN, extending the useful life of node。
Above description is only example of the present invention; do not constitute any limitation of the invention; obviously for those skilled in the art; after having understood present invention and principle; all it is likely to when without departing substantially from the principle of the invention, structure; carry out the various corrections in form and details and change, but these based on the correction of inventive concept and change still within the claims of the present invention。
Claims (4)
1. a MAC protocol for the multi-channel allocation method mapped based on channel, comprises the steps:
(1) adding channel state field in the beacon frame of WBAN, obtain indicating the beacon frame of channel status, wherein the binary digit 0 in this territory represents that channel idle can be used, and 1 represents that channel busy is unavailable；
(2) binary digit of the channel state field in the beacon frame obtained from left to right is mapped from small to large with channel number, and according to the scanning result to channel status of the focal point in WBAN, in channel state field, each channel status is labeled by 0 or 1；
(3) ordinary node in WBAN receives the beacon frame indicating channel status sent from focal point, resolve the channel state field of this frame, learn the channel number that each binary digit is mapped, and according to the mapped channel number of the binary digit being labeled as 0 in channel state field in this beacon frame, obtain available channel；
(4) ordinary node in WBAN determines whether that business arrives, and if so, then performs step (5)；Otherwise perform step (9)；
(5) ordinary node in WBAN randomly chooses the available channel of acquisition, and switches to this channel；
(6) channel that the ordinary node carrier sense in WBAN switches, it is judged that whether this channel is still idle available, if so, then performs step (8), otherwise performs step (7)；
(7) ordinary node in WBAN is according to the User Priority probability for its setting, judge whether to rest on the channel switched, if, then keep out of the way according to the carrier sense mechanism having conflict avoidance and wait until that channel is again idle, perform step (8), otherwise perform step (5)；
(8) in WBAN, ordinary node starts to communicate with focal point；
(9) ordinary node and focal point sign off or entrance resting state in WBAN。
2. the MAC protocol of the multi-channel allocation method mapped based on channel according to claim 1, it is characterised in that the channel state field described in step (1), its length can be set as 1 byte or multibyte according to concrete application scenarios。
3. the MAC protocol of the multi-channel allocation method mapped based on channel according to claim 1, it is characterized in that, channel number described in step (2), refer to that the frequency band of the one fixed width focal point in WBAN and ordinary node communication used in advance is in turn divided into the channel of equal wide from small to large, and to these channels number consecutively in order。
4. the MAC protocol of the multi-channel allocation method mapped based on channel according to claim 1, it is characterized in that, User Priority probability described in step (7), refer to and corresponding probability is set for each User Priority, it is specially, the User Priority probability of User Priority 1,2,3 and 4 is 1/4, and the User Priority probability of User Priority 5 and 6 is 1/2, and the User Priority probability of User Priority 6 and 7 is 3/4。
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| CN106658749A (en) * | 2016-11-25 | 2017-05-10 | 南京理工大学 | Protocol sequence channel access algorithm based on carrier interception |
| CN108055059A (en) * | 2017-12-14 | 2018-05-18 | 天津中科智城网络科技有限公司 | A kind of optimization method of LoRa wireless communications order |
| CN109067480A (en) * | 2018-08-23 | 2018-12-21 | 广州恒创智能科技有限公司 | Using the energy and data transmission period distribution method of the WBAN of WPT technology |
| CN109982421A (en) * | 2019-05-13 | 2019-07-05 | 深圳格林帕科技有限公司 | A kind of low-power consumption narrowband radio network information channel cut-in method |
| CN110266416A (en) * | 2019-07-01 | 2019-09-20 | 东北大学秦皇岛分校 | A kind of double-deck multi-channel scheduling MAC protocol coexisted towards multiple wireless body area networks |
| CN112188618A (en) * | 2019-07-01 | 2021-01-05 | 深圳长城开发科技股份有限公司 | Networking method, terminal, gateway and storage medium for dynamically adjusting network access resources |
| CN114171175A (en) * | 2021-12-13 | 2022-03-11 | 医贝云服(杭州)科技有限公司 | Hospital material fine management system based on RFID and multi-terminal communication |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658749A (en) * | 2016-11-25 | 2017-05-10 | 南京理工大学 | Protocol sequence channel access algorithm based on carrier interception |
| CN106658749B (en) * | 2016-11-25 | 2020-05-22 | 南京理工大学 | Protocol sequence channel access algorithm based on carrier sensing |
| CN108055059A (en) * | 2017-12-14 | 2018-05-18 | 天津中科智城网络科技有限公司 | A kind of optimization method of LoRa wireless communications order |
| CN109067480A (en) * | 2018-08-23 | 2018-12-21 | 广州恒创智能科技有限公司 | Using the energy and data transmission period distribution method of the WBAN of WPT technology |
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| CN109982421A (en) * | 2019-05-13 | 2019-07-05 | 深圳格林帕科技有限公司 | A kind of low-power consumption narrowband radio network information channel cut-in method |
| CN110266416A (en) * | 2019-07-01 | 2019-09-20 | 东北大学秦皇岛分校 | A kind of double-deck multi-channel scheduling MAC protocol coexisted towards multiple wireless body area networks |
| CN112188618A (en) * | 2019-07-01 | 2021-01-05 | 深圳长城开发科技股份有限公司 | Networking method, terminal, gateway and storage medium for dynamically adjusting network access resources |
| CN114171175A (en) * | 2021-12-13 | 2022-03-11 | 医贝云服(杭州)科技有限公司 | Hospital material fine management system based on RFID and multi-terminal communication |
| CN114171175B (en) * | 2021-12-13 | 2023-09-19 | 医贝云服(杭州)科技有限公司 | Hospital material refinement management system based on RFID and multi-terminal communication |
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Application publication date: 20160622 |