WO2015154499A1 - Wban的信息交互方法、装置及系统 - Google Patents

Wban的信息交互方法、装置及系统 Download PDF

Info

Publication number
WO2015154499A1
WO2015154499A1 PCT/CN2014/093404 CN2014093404W WO2015154499A1 WO 2015154499 A1 WO2015154499 A1 WO 2015154499A1 CN 2014093404 W CN2014093404 W CN 2014093404W WO 2015154499 A1 WO2015154499 A1 WO 2015154499A1
Authority
WO
WIPO (PCT)
Prior art keywords
node
hub
period
slot
slot period
Prior art date
Application number
PCT/CN2014/093404
Other languages
English (en)
French (fr)
Inventor
郭阳
耿胜杰
刘静
李明
王新兵
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP14888694.8A priority Critical patent/EP3179785B1/en
Priority to US15/501,529 priority patent/US10219218B2/en
Publication of WO2015154499A1 publication Critical patent/WO2015154499A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • 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
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a WBAN information interaction method, apparatus, and system.
  • a wireless body area network is a branch of wireless communication. It consists of sensors and personal terminals distributed on the body surface or inside the body. Through WBAN, the human body can communicate with external electronic devices such as mobile phones, and then borrow other networks such as WIFI, 3G, etc., and finally send human body information to destinations, such as hospitals.
  • Wireless body area networks can be used in many fields, such as entertainment activities, sports activities, military fields, etc., but as the biggest driving force for its rise is in the medical field, with the improvement of people's living standards and higher pursuit of health, The application of WBAN in the medical field will be widely developed.
  • WBAN provides a long-term monitoring of human health conditions without affecting people's normal lives. Since the sensor is located in the human body, some sensors such as blood pressure information sensors are even implanted in the body, which puts a lot of demands on WBAN. First of all, the sensor nodes in WBAN need to be small in size, light in weight, and easy to be worn by the human body. Secondly, since the sensor nodes need to work for a long time, the power consumption of the sensor nodes is required to be as low as possible.
  • an efficient wireless body area network MAC layer protocol is proposed, which proposes two efficient methods: flexible time slot allocation and reducing the number of times of wireless receiving and transmitting.
  • a related art access control method for a wireless body area network is also proposed in the related art. The method has the following features: more nodes are put into a sleep state; and robustness of communication is enhanced.
  • FIG. 1 is a schematic diagram of a frame structure of the WBAN protocol in the IEEE according to the related art.
  • the WBAN frame structure is as shown in FIG. 1, but there are some disadvantages.
  • the first is that the RAP is a normal service, and the carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) access mode is adopted. Since each node collects human body vital information periodically, the traffic volume of each node is relatively stable. It is debatable to adopt CSMA/CA.
  • CSMA/CA carrier Sense Multiple Access with Collision Avoidance
  • MAP requires a series of "interrogation-response" for the base station (Hub) and the node (Sensor), which brings additional energy consumption.
  • the polling is performed in a certain order, when the Hub polls a certain node, if the node applies for a longer time slot resource to the Hub through a successful response (ACK) reply, then those are not yet polled.
  • ACK successful response
  • the nodes that arrive they can apply for fewer time slots (because the length of the MAP is certain), so that fairness is not guaranteed.
  • the role of Beacon 2 (Bacon 2 in the figure) is only to indicate the beginning of the CAP phase, and its role can be further developed.
  • the embodiments of the present invention provide a method, an apparatus, and a system for information exchange of a WBAN, so as to at least solve the problem of the signaling transmission structure of the WBAN in the related art.
  • a method for information interaction of a wireless body area network including: sending, by a base station Hub, a beacon frame to a node sensor according to a preset superframe structure and information sent by the receiving node;
  • the superframe structure includes three phases, and the first phase includes a first beacon period, a first slot period, and a second slot period, where the first slot period and the second slot period are respectively used for sending an emergency by the node. Traffic and normal service; the second phase includes a second beacon period for the node to supplement the transmission service, and a third slot period for the fourth slot period, the fourth period
  • the slot period is used by the node to send a sleep request and/or an access request.
  • the Hub sends the beacon frame to the node according to the preset superframe structure and the information sent by the receiving node includes: in the first beacon period, the Hub determines the first time for the node to send the emergency service.
  • the number of slots required for the slot period and the slot allocated for each node in the second slot period for the node to send the normal service are distributed to the nodes of the access network through the first beacon frame.
  • the Hub sends the beacon frame to the node according to the preset superframe structure and the information sent by the receiving node includes: the Hub receives the emergency service sent by the node in the first slot period.
  • the Hub sends the beacon frame to the node according to the preset superframe structure and the information sent by the receiving node includes: in the second slot period, the Hub receives the TDMA-based common service sent by the node, and/or Get the request information of the node for the extra time slot.
  • the application information of the Hub acquisition node for the additional time slot includes at least one of the following: the application information of the marked service type sent by the Hub receiving node is an emergency service, where the required number of time slots is included; and the Hub determines the service transmission of the node. Failure, sending a failure response NACK signal to the node, and considering that the node applies for the application information indicating that the service type is a transmission failure service, where the required number of slots is the number of slots of the service that failed to be sent; Hub receiving The tag service type sent by the node is the application information of other common services, including the required number of slots.
  • the method further includes: the Hub sending the response information to the node, where the response information Including one of the following: in the case that the Hub successfully receives the information sent by the node and the node does not apply for an additional time slot, sends a successful response ACK to the node and does not open the wireless communication command OFF in the second beacon period; succeeded in the Hub.
  • the Hub sends the beacon frame to the node according to the preset superframe structure, and the information sent by the receiving node includes: the Hub in the second beacon period, the determined third slot period and the fourth slot.
  • the number of required time slots and the time slot allocated for each node applying for additional time slots in the third time slot period are issued to the nodes of the access network through the second beacon frame.
  • the Hub determines the number of slots required for the third slot period and the fourth slot period respectively: if the total number of additional slots applied by the node in the current frame is greater than m, m+a, and m+a ⁇ k-2, the number of slots in the third slot period is adjusted to m + a; if m + a > k - 2, the number of slots in the third slot period is adjusted to k-2, and under Adjusting the total number of slots in the third slot period and the fourth slot period to m+a+2 through the first beacon period in one frame; and/or, if the current frame, the total number of additional slots applied by the node is less than m, increasing the number of slots in the fourth slot period from n to n+b, where p is the average number of sleep nodes in the network, and if n+b>2p, the first beacon period will be passed in the next frame.
  • the total number of time slots in the third slot period and the fourth slot period is adjusted to k-(n+b-2p); where m is the number of slots in the third slot period in the previous frame, and n is in the previous frame.
  • the number of slots in the fourth slot period, k m + n.
  • the Hub allocates a time slot for each node applying for an additional time slot in the third time slot period: the Hub allocates a time slot for a node that requests to set an extra time slot for transmitting emergency service; After the extra time slot of the emergency service, the Hub allocates a time slot for the node that applies for the service that is set to resend the failed transmission; after completing the allocation of the additional time slot for retransmitting the service that failed to be sent, the Hub sets the application to continue to send the ordinary time.
  • the node of the service allocates a time slot; wherein, for a node that is not allocated to the time slot, the Hub preferentially allocates a time slot to the same type of node in the third time slot period in the next frame.
  • the Hub sends the beacon frame to the node according to the preset superframe structure, and the information sent by the receiving node includes: in the third slot period, the Hub receives the service that the node supplements and sends.
  • the Hub sends the beacon frame to the node according to the preset superframe structure and the information sent by the receiving node includes: in the fourth slot period, the Hub receives the sleep application and/or the access request sent by the node.
  • the method further includes: the Hub does not allocate a time slot to the node that sends the sleep request in the second time slot in the next frame; and/or, Hub A slot is allocated to a node that transmits an access request in a second slot period in the next frame.
  • a method for information interaction of a wireless body area network including: a node sensor transmitting information to a base station Hub according to a preset superframe structure, and receiving a beacon frame sent by the Hub;
  • the superframe structure includes three phases, where the first phase includes a first beacon period, a first slot period, and a second slot period, and the first slot period and the second slot period are respectively used for node sending.
  • Emergency service and normal service the second phase includes a second beacon period for the node to supplement the transmission service, and a third slot period for the fourth slot period, the fourth period
  • the slot period is used by the node to send a sleep request and/or an access request.
  • the sending, by the node, the information to the Hub according to the preset superframe structure and receiving the beacon frame sent by the Hub includes: the node acquiring, by using the first beacon frame sent by the Hub, in the first beacon period The number of slots required by the node to transmit the first slot period of the emergency service and the slot allocated for the current node in the second slot period for the node to transmit the normal service.
  • the sending, by the node, the information to the Hub according to the preset superframe structure and receiving the beacon frame sent by the Hub includes: determining, by the node, whether the emergency service needs to be sent in the first time slot period; if yes, The node competes for the access channel and sends an emergency service to the Hub; if the non-contention access channel is successful, the node marks itself as having an emergency service to transmit.
  • the sending, by the node, the information to the Hub according to the preset superframe structure and receiving the beacon frame sent by the Hub includes: in the second slot period, the node is released according to the Hub in the first beacon period for the current node. Sending a normal service based on a time slot of a TDMA-based normal service, and/or transmitting application information for an additional time slot.
  • the request information sent by the node for the additional time slot includes at least one of the following: the node sends the application information indicating that the service type is an emergency service, where the required number of time slots is included; and the node sends the marked service type to other common services.
  • Application information which contains the number of required time slots.
  • the sending, by the node, the information to the Hub according to the preset superframe structure and receiving the beacon frame sent by the Hub includes: in the second beacon period, the node obtains the third by receiving the second beacon frame issued by the Hub. Slot period The number of time slots required respectively for the fourth time slot period and the time slots allocated for the nodes applying for the additional time slots in the third time slot period.
  • the sending, by the node, the information to the Hub according to the preset superframe structure and receiving the beacon frame sent by the Hub includes: in the third time slot period, the node applies the extra time according to the Hub issued in the second beacon period.
  • the slots allocated by the nodes of the slot complement the transmission service.
  • the sending, by the node, the information to the Hub according to the preset superframe structure and receiving the beacon frame sent by the Hub includes: in the fourth slot period, the node competes for the access channel and sends a sleep request to the Hub and/or Access application.
  • the method further includes: if the node sends a sleep request to the Hub, the node enters a sleep state in the next frame; / or, if the node sends an access request to the Hub, the node receives the time slot allocated by the Hub for the first beacon period of the next frame.
  • an information interaction device of a wireless body area network is provided, which is located in a base station Hub, and includes: a first sending module, configured to send a message to a node sensor according to a preset superframe structure.
  • a first receiving module configured to receive information sent by the node according to a preset superframe structure; wherein the superframe structure includes three phases, the first phase includes a first beacon period, and the first time The slot period and the second slot period, the first slot period and the second slot period are respectively used for the node to send emergency services and common services; the second stage includes the second beacon period and the third slot period, The third slot period is used for the node to supplement the transmission service; the third period includes the fourth slot period, and the fourth slot period is used by the node to send a sleep application and/or an access request.
  • an information interaction device of a wireless body area network located in a node sensor, and includes: a second sending module, configured to send information to a base station Hub according to a preset superframe structure; And the second receiving module is configured to receive the beacon frame sent by the Hub according to the preset superframe structure; wherein the superframe structure includes three phases, where the first phase includes the first beacon period and the first slot And the second slot period, the first slot period and the second slot period are respectively used for the node to send the emergency service and the normal service; the second stage includes the second beacon period and the third slot period, The third slot period is used by the node to supplement the transmission service; the third period includes a fourth slot period, and the fourth slot period is used by the node to send a sleep application and/or an access request.
  • WBAN wireless body area network
  • an information interaction system of a wireless body area network including the information interaction device of the WBAN located in the base station Hub, and the information about the WBAN located in the node Sensor. Interactive device.
  • the Hub sends the beacon frame to the node according to the preset superframe structure and the information sent by the receiving node; wherein the superframe structure includes three phases, and the first phase includes the first beacon period, The first slot period and the second slot period, the first slot period and the second slot period are respectively used for the node to send emergency services and common services; and the second stage includes the second beacon period and the third slot.
  • the third slot period is used for the node to supplement the transmission service;
  • the third phase includes the fourth slot period, and the fourth slot period is used for the node to send the sleep application and/or the access request, and the solution is solved.
  • the problem of the signaling transmission structure of the WBAN in the related art under the premise of ensuring the successful access of the packet to the channel, greatly reduces the probability of transmission failure, and utilizes the time slot to a greater extent and ensures the emergency service as much as possible. Priority transfer while reducing node and network power consumption.
  • FIG. 1 is a schematic diagram of a frame structure of a WBAN protocol in IEEE according to the related art
  • FIG. 2 is a flowchart of a WBAN information interaction method according to an embodiment of the present invention.
  • FIG. 3 is a structural block diagram of an information interaction apparatus of a WBAN according to an embodiment of the present invention.
  • FIG. 5 is a structural block diagram of another WBAN information interaction apparatus according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of an information interaction system of a WBAN according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a superframe structure of a WBAN protocol according to a preferred embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a Hub workflow in a superframe according to a preferred embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a workflow of a node in a superframe according to a preferred embodiment of the present invention.
  • Figure 10 is a schematic illustration of a system model in accordance with a preferred embodiment of the present invention.
  • FIG. 2 is a flowchart of a WBAN information interaction method according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps. step:
  • Step S202 the base station (Hub) sends a beacon frame to the node (Sensor) according to a preset superframe structure, and the information sent by the receiving node;
  • the superframe structure includes three phases, and the first phase includes a first beacon period (B1), a first slot period (EAP), and a second slot period (MAP1), where the first slot period And the second slot period is respectively used for the node to send the emergency service and the normal service; the second stage includes the second beacon period (B2) and the third slot period (MAP2), and the third slot period is used for node supplementation.
  • the service is transmitted; the third phase includes a fourth slot period (CAP), and the fourth slot period is used by the node to send a sleep application and/or an access request.
  • CAP fourth slot period
  • the information is exchanged between the Hub and the node according to the superframe structure as described above, and the second phase is used to supplement the first phase, and the problem of the signaling transmission structure of the WBAN in the related art is solved.
  • the probability of transmission failure is greatly reduced, the time slot is utilized to a greater extent, and the priority transmission of the emergency service is ensured as much as possible, and the energy consumption of the node and the network is reduced.
  • the Hub determines the number of slots required for the first slot period for the node to send emergency services and the second slot period for the node to send the normal service.
  • the time slot allocated for each node is issued to the node of the access network through the first beacon frame.
  • the Hub receives the emergency service sent by the node in the first slot period.
  • the Hub receives the TDMA-based normal service sent by the node in the second slot period, and/or acquires the application information of the node for the additional time slot.
  • the application information of the Hub acquisition node for the additional time slot may include at least one of the following: the application information of the marked service type sent by the Hub receiving node is “emergency service”, which includes the required number of time slots; and/or, Hub Determining that the service of the node fails to be sent, sending a failure response (NACK) signal to the node, and determining that the node applies for the application information indicating that the service type is "sending failure service", where the required number of slots is the failure to send.
  • the number of time slots of the service; and/or, the application information of the tag service type sent by the Hub receiving node is “other common services”, which includes the required number of time slots.
  • the Hub may also send the information to the node.
  • Response information wherein the response information may include one of the following: success at the Hub Receiving the information sent by the node and the node does not apply for an additional time slot, sending a success response (ACK) to the node and not opening the wireless communication command OFF during the second beacon period (ie, indicating that the second beacon period is closed) Wireless communication command);
  • ACK success response
  • the Hub When the Hub successfully receives the information sent by the node and the node applies for an additional time slot, sends a success response (ACK) to the node and turns on the wireless communication command ON during the second beacon period (ie, indicates the second beacon) The order to enable wireless communication);
  • ACK success response
  • the Hub does not successfully receive the information sent by the node, sending a failure response (NACK) to the node and turning on the wireless communication command ON during the second beacon period (ie, an instruction indicating that wireless communication is enabled during the second beacon period) ).
  • NACK failure response
  • beacon frame 2 (Beacon 2, B2 in the figure) in the related art is merely to indicate the beginning of the CAP phase
  • the Hub can obtain the general situation of the current channel according to the performance of the node in the EAP, RAP, and MAP phases (the number of packets successfully transmitted, whether there are service requests, etc.), and make a more reasonable arrangement for the rest of the current frame. And the new scheduling is released via Beacon2.
  • the Hub will determine the number of required slots in the third slot period and the fourth slot period, respectively, and in the third slot period.
  • the time slot allocated by the node applying for the extra time slot is distributed to the node of the access network through the second beacon frame.
  • the Hub determines the number of required slots in the third slot period and the fourth slot period respectively, which may include: if the total number of additional slots applied by the node in the current frame is greater than m, m+a, and m+a ⁇ K-2, the number of slots in the third slot period is adjusted to m+a; if m+a>k-2, the number of slots in the third slot period is adjusted to k-2, and next Adjusting the total number of time slots in the third slot period and the fourth slot period to m+a+2 through the first beacon period in the frame; and/or,
  • the number of time slots in the fourth time slot period is increased from n to n+b, where p is the average number of sleep nodes in the network, if n+b>2p , in the next frame, the first slot period is adjusted to the total number of slots in the third slot period and the fourth slot period to k-(n+b-2p);
  • n is the number of slots in the fourth slot period in the previous frame
  • k is the number of slots in the fourth slot period in the previous frame
  • b is the time when the fourth slot period increases The number of gaps.
  • the Hub allocates a time slot for each node applying for an additional time slot in the third time slot period, which may include:
  • the Hub first allocates time slots for nodes that apply to set additional time slots for transmitting emergency services (ie, the above-mentioned application for marking the service type as "emergency service”); after completing the allocation of additional time slots for transmitting emergency services, the Hub And then allocate a time slot for the node that is set to resend the service that failed to send the transmission (ie, the above-mentioned application tagged service class)
  • the type is "sending failure service” node); after completing the allocation of the additional time slot for resending the service that failed to be sent, the Hub finally allocates the time slot for the node that is set to continue to send the normal service (ie, the above-mentioned application tagging service) a node of the type "other common service”; wherein, for a node that is not allocated a time slot in this frame, the Hub preferentially allocates a time slot to the same type of node in the third time slot period of the next frame, for example, If a no
  • the Hub in the third slot period receives the service that the node supplements.
  • the Hub receives the sleep application and/or the access request sent by the node in the fourth slot period.
  • the Hub does not allocate a time slot to the node that sends the sleep request in the second slot period in the next frame; and/or, the Hub is in the next frame.
  • the slot in which the access request is sent is allocated in the second slot period.
  • a WBAN information interaction device is also provided, which is located in the Hub, and the device is configured to implement the above-mentioned embodiments and preferred embodiments, which have been described. No longer.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 3 is a structural block diagram of an information interaction apparatus 30 of a WBAN according to an embodiment of the present invention. As shown in FIG. 3, the apparatus 30 includes a first sending module 32 and a first receiving module 34. Details of each module are described below. Description:
  • the first sending module 32 is configured to send a beacon frame to the node according to a preset superframe structure; and the first receiving module 34 is configured to receive information sent by the node according to a preset superframe structure; wherein the super The frame structure includes three phases, the first phase including a first beacon period (B1), a first slot period (EAP), and a second slot period (MAP1), the first slot period and the second slot The period is used for the node to send the emergency service and the normal service respectively; the second stage includes the second beacon period (B2) and the third slot period (MAP2), and the third slot period (CAP) is used for the node to supplement the transmission service.
  • the third phase includes a fourth slot period for the node to send a sleep request and/or an access request.
  • FIG. 4 is a flowchart of another WBAN information interaction method according to an embodiment of the present invention. As shown in FIG. 4, the method includes the following steps. :
  • Step S402 the node (Sensor) sends information to the base station (Hub) according to the preset superframe structure and receives the beacon frame sent by the Hub;
  • the superframe structure includes three phases, and the first phase includes a first beacon period, a first slot period, and a second slot period, where the first slot period and the second slot period are respectively used
  • the node sends an emergency service and a normal service
  • the second phase includes a second beacon period and a third slot period, the third slot period is used for the node to supplement the transmission service
  • the third phase includes the fourth slot period, The fourth slot period is used by the node to send a sleep application and/or an access request.
  • the node obtains, by using the first beacon frame sent by the Hub, the number of slots required for the first slot period for the node to send the emergency service, and is used for sending the node in the first beacon period.
  • the time slot allocated to the current node in the second slot period of the normal service is used for sending the node in the first beacon period.
  • the node determines whether there is an emergency service to be sent in the first slot period; if yes, the node contends for the access channel and sends an emergency service to the Hub; if the access channel is not contending for success, Then the node tag itself needs to be sent for emergency service.
  • the node sends the normal service according to the time slot issued by the Hub in the first beacon period for the current node to send the TDMA-based common service in the second slot period, and/or, for the extra time Application information for the gap.
  • the request information sent by the node for the additional time slot may include at least one of the following: the node sends the application information indicating that the service type is emergency service, where the required number of time slots is included; and the node sends the application that marks the service type to other common services. Information containing the number of slots required.
  • the node acquires the required number of slots in the third slot period and the fourth slot period and the third slot in the second beacon period by receiving the second beacon frame issued by the Hub.
  • a time slot assigned to a node requesting an extra time slot.
  • the node supplements the transmission service according to the time slot allocated by the Hub issued by the Hub in the second beacon period for applying for the extra time slot in the third slot period.
  • the node contends for the access channel and sends a sleep application and/or access request to the Hub during the fourth slot period.
  • the node After the node contends for the access channel and sends a sleep application and/or access request to the Hub, if the node sends a sleep request to the Hub, the node enters a sleep state in the next frame; and/or if the node An access request is sent to the Hub, and the node receives the time slot allocated by the Hub for the first beacon period of the next frame.
  • FIG. 5 is another WBAN information interaction device according to an embodiment of the present invention.
  • 50 is a structural block diagram, as shown in FIG. 5, the device 50 includes a second sending module 52 and a second receiving module 54, and each module is described in detail below:
  • the second sending module 52 is configured to send information to the Hub according to the preset superframe structure; and the second receiving module 54 is configured to receive the beacon frame sent by the Hub according to the preset superframe structure; wherein the super The frame structure includes three phases, the first phase includes a first beacon period, a first slot period, and a second slot period, where the first slot period and the second slot period are respectively used by the node to send emergency services and Ordinary service; the second phase includes a second beacon period for the node to supplement the transmission service, and a third slot period for the fourth slot period, the fourth slot period Used by the node to send sleep requests and/or access requests.
  • FIG. 6 is a structural block diagram of an information interaction system of a WBAN according to an embodiment of the present invention. As shown in FIG. 6, the system includes the same as shown in FIG. The information interaction device 30 of the WBAN located in the Hub further includes an information interaction device 50 of the WBAN located in the node as shown in FIG. 5.
  • a wireless body area network access control method for efficient use of time slots is provided.
  • the method is based on IEEE, and greatly reduces transmission failure under the premise of ensuring successful access of a packet to a channel.
  • the high-efficiency wireless body network media access control method provided by the preferred embodiment adopts a supplementary transmission method, and specifically includes the following steps: transmitting a first beacon frame B1; the node competing for an access channel to perform emergency service transmission; Normal traffic transmission in the TDMA mode, during which the node simultaneously sends an additional time slot request; during the beacon frame B2, according to the node additional time slot application information, the time slot occupied by the MAP2 and the CAP is planned, and the MAP2 is allocated to the corresponding node.
  • the corresponding node sends additional services during the MAP2 slot period; during the CAP slot period, the node applies for sleep, a new node, or a sleep node to access the network.
  • the method of the preferred embodiment enhances the robustness of the communication by supplementing the transmission, and enhances the robustness of the communication, so that the time slot is more compact, and unnecessary time slots are reduced.
  • the method is more adopted than IEEE.
  • TDMA mode for service transmission in addition, fewer nodes are in communication state, reducing power consumption.
  • FIG. 7 is a modified embodiment according to a preferred embodiment of the present invention.
  • Schematic diagram of the superframe structure of the WBAN protocol as shown in Figure 7, defines the superframe as three phases: the first phase is the normal transmission phase of the node, including the beacon period and two different slot periods (EAP and MAP1). Two time slots are used to send emergency services and normal services respectively; the second phase is to supplement the transmission service phase, the emergency service that appears in the first phase, the ordinary service that fails to be sent, and the additional service are sent at this stage.
  • the phase includes a beacon period and a slot period (MAP2); the third phase deals with a new node and a sleep node period, which includes a slot period (CAP).
  • MAP2 beacon period
  • CAP slot period
  • the preferred embodiment adopts a supplementary transmission method, and makes a reasonable adjustment to the second-stage time slot according to the first-stage transmission status, so that the second stage supplements the first stage, improves communication robustness, and is sufficient
  • the time slot is utilized.
  • the workflow of the supplementary transmission method adopted by the preferred embodiment is described in detail as follows:
  • Step 1 Send a beacon frame B1.
  • the Hub allocates a time slot to each node according to the number of nodes of the access network and the sampling rate information of the corresponding node, and determines the number of time slots required for processing the EAP in the emergency service period.
  • the Hub sends this information through the beacon frame B1 to the nodes in the access network.
  • the information includes the synchronization information and the number of slots occupied by the EAP, and the number of slots occupied by the MAP1.
  • the wireless communication is turned on during this period, the information is received, and the wireless communication time is next opened according to the received information.
  • the calculation method is: 1. If the time slot has been allocated, the wireless communication is turned on in the corresponding time slot; 2. If the time slot is not allocated, the wireless communication is turned on at the beginning of the next frame.
  • Step 2 Emergency service transmission.
  • the node may encounter some sudden changes in information. If the collected blood pressure signal suddenly rises, information such as this may be defined as an emergency service.
  • the EAP period in the frame structure proposed by the preferred embodiment is used to cope with emergency services. During this period, the node competes for the access channel, and the Hub communicates with the node of the access channel to receive emergency services.
  • Step 3 TDMA-based ordinary service transmission.
  • the wireless communication For each node, it is judged whether or not the time slot allocated by itself arrives. If it does not come, the wireless communication is turned off; if the assigned time slot arrives, the node turns on the wireless communication and transmits the information. In addition to the sampling information, the transmitted information contains application information of additional time slots.
  • the application information for the extra time slot is explained as follows: 1. For a node, if the node has an emergency service that is not successfully sent during the EAP or temporarily generates an emergency service, the application information sent by the node is marked as "emergency service". ", and contains the required number of time slots; 2. If the node receives the NACK signal from the Hub reply after sending the normal service, it indicates that the service has failed to be sent. Here, the node no longer sends the application information, but the Hub has already known that the node failed to send. The number of slots, so equivalent to the node sent the application information, the service type is "transmission failure service"; 3. If the node at the end of its assigned time slot, there is still additional information has not been sent, the application information sent by the node Mark the service type as "other common services" and include the number of required slots.
  • the Hub should reply to the corresponding information of the node.
  • the information consists of two instructions, whether to receive the information command (ACK/NACK) and whether to open the wireless communication command (ON/OFF) in the B2 slot period: 1. If the Hub successfully receives the information sent by the node, and If the node does not apply for additional time slots, it replies to the node ACK, OFF; 2. If the Hub successfully receives the information sent by the node, and the node has applied for additional time slots, it replies to the node ACK, ON; 3. If the Hub does not Upon receiving the information sent by the node, the node replies with NACK and ON, indicating that the node needs to resend the information during the subsequent slot period.
  • Step 4 Send a beacon frame B2.
  • the Hub needs to complete two tasks: 1. Plan the number of slots occupied by each of MAP2 and CAP; 2. Assign the MAP2 slot to the relevant node, and issue the slot allocation information.
  • the Hub needs to calculate how to allocate a certain number of slots to MAP2 and CAP.
  • the algorithm is as follows:
  • the distribution method is as follows:
  • the Hub increases its priority and allocates a time slot for MAP2 in the next frame.
  • the priority is that for the same service type, that is, the priority of the "emergency service” is higher than that of the "transmission failure service”, and the priority of the "sending failure service” is higher than that of the "other common service” type.
  • Step 5 Supplementary service transmission based on TDMA.
  • the MAP2 and MAP1 processes are basically the same, and the Hub communicates with the corresponding nodes in turn. The difference is that during the MAP2, the node only sends service information, and no additional time slot application information is sent.
  • Step 6 The new node or the sleeping node accesses the network.
  • CAP is the transmission requirement for handling the new node and the sleeping node. It can be seen that in the algorithm of step four, the CAP is guaranteed to occupy at least two time slots.
  • the node adopts the method of contention access. For a node accessing the network, if it needs to sleep, it will open the wireless communication listening channel during the time slot, competing for access, and send a sleep application to the Hub after successful access. After obtaining permission, it will enter in the next frame. Sleep state. For a new node or a sleep node that needs to re-access the network, the wireless communication is also opened to contend for access; after successful access, the application sends access information to the Hub, and after obtaining the permission, participates in the communication process in the next frame, correspondingly, The Hub will allocate time slots for it during the next frame B1.
  • FIG. 8 is a schematic diagram of a Hub workflow in a superframe according to a preferred embodiment of the present invention
  • FIG. 9 is a schematic diagram of a node workflow in a superframe according to a preferred embodiment of the present invention, and the steps implemented by the supplemental transmission method in the preferred embodiment. See Figure 8 and Figure 9.
  • the sensor node only opens the wireless communication in a small number of cases, and is more in a non-communication state. Reduce unnecessary competition and reduce power consumption.
  • the second beacon frame in the superframe is used for time slot redistribution, so that the time slot utilization in the frame structure is more sufficient, and unnecessary time slots with no information transmission are reduced.
  • FIG. 10 is a schematic diagram of a system model according to a preferred embodiment of the present invention.
  • the network structure is as shown in FIG. 10, and sensor nodes with different sampling rates are distributed on the body surface or in the body.
  • the base station is generally located in the vicinity of the human body. If placed in the bedroom, the base station transmits the collected human body information to other medical structures through other networks such as WIFI, 3G, 4G, etc., to achieve long-term remote monitoring of human health conditions.
  • the communication between the sensor and the base station includes the following steps:
  • Step 1 Send a beacon frame B1.
  • the Hub broadcasts the slot allocation information and the synchronization information to the nodes in the network through the beacon frame B1; correspondingly, the node accessing the network opens the wireless communication during this period, receives the information, and then closes the wireless communication, and according to the received The information is calculated the next time the wireless communication is turned on.
  • Step 2 Emergency service transmission.
  • Some nodes may generate mutation sampling information, which is usually accompanied by human lesions and needs to be sent in time.
  • the node sends emergency services by means of contention access.
  • the priority of the competition priority visual node type and the degree of mutation of the sampling information For the node that does not successfully access the channel, mark itself as “have urgent service to be sent”, and apply for a time slot to the Hub in the MAP1 time slot period. Information is sent during the MAP2 slot period.
  • Step 3 TDMA-based ordinary service transmission.
  • the Hub receives information from each node and records additional service request information.
  • Step 4 Send a beacon frame B2.
  • the Hub needs to complete two tasks: 1. Allocate the number of slots occupied by MAP2 and CAP according to the additional service application information plan, 2. Assign the MAP2 time slot to the relevant node, and issue the time slot allocation information through B2.
  • the distribution method is as follows:
  • the Hub increases its priority and allocates a time slot for MAP2 in the next frame.
  • the priority is that for the same service type, that is, the "emergency service” priority is always higher than the "sending failure service” type, and the "sending failure service” priority is always higher than the "other common service” type.
  • Step 5 Supplementary service transmission based on TDMA.
  • the Hub communicates in turn with nodes that have additional traffic sent and are assigned to time slots.
  • Step 6 The new node or the sleeping node accesses the network.
  • the sampling rate of nodes is different, some nodes with low sampling rate do not need to send information every frame, and can reduce power consumption by letting them sleep.
  • the sleeping nodes need to reconnect to the network when sending information.
  • the network often There will be new nodes that need to access the network.
  • the CAP of the last slot period of the superframe is used for the node to access the network. If a node needs to sleep, open the wireless communication listening channel during the time slot, competing for access, and after getting sleep permission, enter the sleep state in the next frame; open the wireless communication and compete for access to the node that needs to access the network. After successful access, the application sends access information to the Hub, and after receiving the reply, the information is sent in the next frame.
  • a storage medium in which the above software is stored, including but not limited to an optical disk, a floppy disk, a hard disk, an erasable memory, and the like.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the WBAN information interaction method, apparatus, and system provided by the embodiments of the present invention have the following beneficial effects: the problem of the signaling transmission structure of the WBAN in the related art is solved, and the protection is achieved. On the premise that the packet successfully accesses the channel, the probability of transmission failure is greatly reduced, the time slot is utilized to a greater extent, and the priority transmission of the emergency service is ensured as much as possible, and the energy consumption of the node and the network is reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明公开了一种WBAN的信息交互方法、装置及系统，其中，该方法包括：Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。通过本发明，解决了相关技术中的WBAN的信令传输结构存在的问题，很大程度减小了发送失败的几率，更大程度利用了时隙并尽可能保证紧急业务的优先传输，同时降低了节点和网络能耗。

Description

WBAN的信息交互方法、装置及系统 技术领域
本发明涉及通信领域，具体而言，涉及一种WBAN的信息交互方法、装置及系统。
背景技术
无线体域网(Wireless body area network，简称为WBAN)是无线通信的一个分支，它由分布在人体体表或体内的传感器以及个人终端构成。通过WBAN，人体可以与外界电子设备如手机等进行通信，进而可以借用其他网络如WIFI、3G等，最终将人体的信息发送到目的地，如医院等。无线体域网可以应用在许多领域，如娱乐活动、体育活动、军事领域等，但是作为它兴起的最大动力是在医疗领域的应用，随着人们生活水平的提高以及对健康的更高追求，WBAN在医疗领域的应用将得到广泛的发展。
在医疗领域，WBAN在不影响人们正常生活的条件下，提供了对人体健康状况进行长期监督的方法。由于传感器位于人体，某些传感器如采集血压信息传感器甚至要植入体内，这就对WBAN提出了很多要求。首先，WBAN中的传感器节点需要体积小、重量轻，易于人体佩戴；其次，由于传感器节点需长期工作，从而要求传感器节点的功耗要尽可能的低。
由于传感器节点的能量主要消耗在与个人终端的通信，因此提出一个低功耗的媒体接入控制(Media Access Control，简称为MAC)层协议是很有必要且具有现实意义的。
相关技术中提出了一种高效的无线体域网MAC层协议，该协议提出了两种高效的方法：灵活的时隙分配以及减小无线接收与发送的转换次数。另外，相关技术中还提出了无线体域网的一种媒质接入控制方法，该方法有以下几个特点：更多的使节点进入睡眠状态；增强了通信的鲁棒性。
IEEE提出了WBAN协议，图1是根据相关技术的IEEE中WBAN协议的帧结构示意图，WBAN帧结构如图1所示，但是存在着某些不足。一是RAP为普通业务服务，而采用了载波侦听多路访问/冲突避免(Carrier Sense Multiple Access with Collision Avoidance，简称为CSMA/CA)接入方式。由于各个节点多是周期性地采集人体体征信息，那么各个节点的业务量相对比较平稳，采用CSMA/CA就值得商榷。二是在IEEE中，对于在EAP和RAP阶段没能接入信道的节点或者节点还有业务，那么还可以通 过MAP发送。此外因为MAP是通过Scheduling和Polling的方式运行的。通过Polling方式是可以实现冲突避免，但是MAP需要基站(Hub)和节点(Sensor)进行一系列的“询问——应答”，这个过程带来额外的交互能耗。此外，因为轮询是按一定顺序进行，当Hub轮询到某个节点时，如果这个节点通过成功响应(ACK)回复向Hub申请了较长的时隙资源，那么对于那些还没有被轮询到的节点，它们所能申请到的时隙就比较少(因为MAP的长度是一定的)，从而公平性得不到保障。三是在IEEE中，信标帧2(Beacon2，图中为B2)的作用仅仅是标示CAP阶段的开始，它的作用可以被进一步开发。
针对相关技术中的WBAN的信令传输结构存在的问题，目前尚未提出有效的解决方案。
发明内容
本发明实施例提供了一种WBAN的信息交互方法、装置及系统，以至少解决相关技术中的WBAN的信令传输结构存在的问题。
根据本发明的一个实施例，提供了一种无线体域网WBAN的信息交互方法，包括：基站Hub按照预设的超帧结构向节点Sensor发送信标帧以及接收节点发送的信息；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
在实施例中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：Hub在所述第一信标期中，将确定的用于节点发送紧急业务的第一时隙期所需时隙数以及在用于节点发送普通业务的第二时隙期中为每个节点分配的时隙，通过第一信标帧发布给接入网络的节点。
在实施例中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：Hub在所述第一时隙期中，接收节点发送的紧急业务。
在实施例中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：Hub在所述第二时隙期中，接收节点发送的基于TDMA的普通业务，和/或，获取节点对于额外时隙的申请信息。
在实施例中，Hub获取节点对于额外时隙的申请信息包括以下至少之一：Hub接收节点发送的标记业务类型为紧急业务的申请信息，其中包含所需时隙数；Hub确定节点的业务发送失败，向所述节点发送失败响应NACK信号，并认为所述节点申请了标记业务类型为发送失败业务的申请信息，其中所需时隙数为发送失败的所述业务的时隙数；Hub接收节点发送的标记业务类型为其他普通业务的申请信息，其中包含所需时隙数。
在实施例中，在Hub接收节点发送的基于TDMA的普通业务，和/或，获取节点对于额外时隙的申请信息之后，还包括：Hub向所述节点发送响应信息，其中，所述响应信息包括以下之一：在Hub成功接收到节点发送的信息且该节点未申请额外时隙的情况下，向所述节点发送成功响应ACK和不在第二信标期打开无线通信指令OFF；在Hub成功接收到节点发送的信息且该节点申请额外时隙的情况下，向所述节点发送成功响应ACK和在第二信标期打开无线通信指令ON；在Hub未成功接收到节点发送的信息的情况下，向所述节点发送失败响应NACK和在第二信标期打开无线通信指令ON。
在实施例中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：Hub在所述第二信标期中，将确定的第三时隙期与第四时隙期分别所需时隙数以及在第三时隙期中为每个申请额外时隙的节点分配的时隙，通过第二信标帧发布给接入网络的节点。
在实施例中，Hub确定第三时隙期与第四时隙期分别所需时隙数包括：若当前帧中，节点申请的额外时隙总数大于m，为m+a，且m+a≤k-2，则将第三时隙期的时隙数调整至m+a；如果m+a>k–2，则将第三时隙期的时隙数调整至k-2，并在下一帧中通过第一信标期将第三时隙期与第四时隙期的时隙总数调整至m+a+2；和/或，若当前帧中，节点申请的额外时隙总数小于m，将第四时隙期的时隙数由n增加至n+b，其中设p为网络中平均睡眠节点数，如果n+b>2p，则在下一帧中通过第一信标期将第三时隙期与第四时隙期的时隙总数调整至k-(n+b-2p)；其中m为上一帧中第三时隙期的时隙数，n为上一帧中第四时隙期的时隙数，k＝m+n。
在实施例中，Hub在第三时隙期中为每个申请额外时隙的节点分配时隙包括：Hub为申请设置为发送紧急业务的额外时隙的节点分配时隙；在完成分配用于发送紧急业务的额外时隙之后，Hub为申请设置为重发发送失败的业务的节点分配时隙；在完成分配用于重发发送失败的业务的额外时隙之后，Hub为申请设置为继续发送普通业务的节点分配时隙；其中，对于未分配到时隙的节点，Hub在下一帧中的第三时隙期中同类型的节点中优先为其分配时隙。
在实施例中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：Hub在所述第三时隙期中，接收节点补充发送的业务。
在实施例中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：Hub在所述第四时隙期中，接收节点发送的睡眠申请和/或接入申请。
在实施例中，在Hub接收节点发送的睡眠申请和/或接入申请之后，还包括：Hub在下一帧中不在第二时隙期中对发送睡眠申请的节点分配时隙；和/或，Hub在下一帧中在第二时隙期中对发送接入申请的节点分配时隙。
根据本发明的另一实施例，提供了一种无线体域网WBAN的信息交互方法，包括：节点Sensor按照预设的超帧结构向基站Hub发送信息以及接收Hub发送的信标帧；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
在实施例中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：节点在所述第一信标期中，通过接收Hub发送的第一信标帧获取用于节点发送紧急业务的第一时隙期所需时隙数以及在用于节点发送普通业务的第二时隙期中为当前节点分配的时隙。
在实施例中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：节点在所述第一时隙期中，判断自身是否存在紧急业务需要发送；如果是，所述节点竞争接入信道并向Hub发送紧急业务；如果未竞争接入信道成功，则所述节点标记自身为有紧急业务需要发送。
在实施例中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：节点在所述第二时隙期中，按照第一信标期中Hub发布的用于当前节点发送基于TDMA的普通业务的时隙发送普通业务，和/或，发送对于额外时隙的申请信息。
在实施例中，节点发送对于额外时隙的申请信息包括以下至少之一：节点发送标记业务类型为紧急业务的申请信息，其中包含所需时隙数；节点发送标记业务类型为其他普通业务的申请信息，其中包含所需时隙数。
在实施例中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：节点在所述第二信标期中，通过接收Hub发布的第二信标帧获取第三时隙期 与第四时隙期分别所需时隙数以及在第三时隙期中为申请额外时隙的节点分配的时隙。
在实施例中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：节点在所述第三时隙期中，按照第二信标期中Hub发布的为申请额外时隙的节点分配的时隙补充发送业务。
在实施例中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：节点在所述第四时隙期中，竞争接入信道并向Hub发送睡眠申请和/或接入申请。
在实施例中，在节点竞争接入信道并向Hub发送睡眠申请和/或接入申请之后，还包括：如果节点向Hub发送了睡眠申请，则所述节点在下一帧中进入睡眠状态；和/或，如果节点向Hub发送了接入申请，则所述节点在下一帧的第一信标期中接收Hub为其分配的时隙。
根据本发明的另一实施例，还提供了一种无线体域网WBAN的信息交互装置，位于基站Hub中，包括：第一发送模块，设置为按照预设的超帧结构向节点Sensor发送信标帧；以及，第一接收模块，设置为按照预设的超帧结构接收节点发送的信息；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
根据本发明的再一实施例，提供了一种无线体域网WBAN的信息交互装置，位于节点Sensor中，包括：第二发送模块，设置为按照预设的超帧结构向基站Hub发送信息；以及，第二接收模块，设置为按照预设的超帧结构接收Hub发送的信标帧；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
根据本发明的再一实施例，还提供了一种无线体域网WBAN的信息交互系统，包括上述的位于基站Hub中的WBAN的信息交互装置，还包括上述的位于节点Sensor中的WBAN的信息交互装置。
通过本发明实施例，采用Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请的方式，解决了相关技术中的WBAN的信令传输结构存在的问题，在保证分组成功接入信道的前提下，很大程度减小了发送失败的几率，更大程度利用了时隙并尽可能保证紧急业务的优先传输，同时降低了节点和网络能耗。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是根据相关技术的IEEE中WBAN协议的帧结构示意图；
图2是根据本发明实施例的一种WBAN的信息交互方法的流程图；
图3是根据本发明实施例的一种WBAN的信息交互装置的结构框图；
图4是根据本发明实施例的另一种WBAN的信息交互方法的流程图；
图5是根据本发明实施例的另一种WBAN的信息交互装置的结构框图；
图6是根据本发明实施例的WBAN的信息交互系统的结构框图；
图7是根据本发明优选实施例的WBAN协议的超帧结构示意图；
图8是根据本发明优选实施例的超帧中Hub工作流程示意图；
图9是根据本发明优选实施例的超帧中节点工作流程示意图；
图10是根据本发明优选实施例的系统模型示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
考虑到上述问题，在本实施例中提供了一种WBAN的信息交互方法，图2是根据本发明实施例的一种WBAN的信息交互方法的流程图，如图2所示，该方法包括如下步骤：
步骤S202，基站(Hub)按照预设的超帧结构向节点(Sensor)发送信标帧以及接收节点发送的信息；
其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期(B1)、第一时隙期(EAP)及第二时隙期(MAP1)，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期(B2)和第三时隙期(MAP2)，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期(CAP)，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
本实施例通过上述步骤，Hub与节点之间按照如上所述的超帧结构进行信息交互，采用第二阶段补充第一阶段的思路，解决了相关技术中的WBAN的信令传输结构存在的问题，在保证分组成功接入信道的前提下，很大程度减小了发送失败的几率，更大程度利用了时隙并尽可能保证紧急业务的优先传输，同时降低了节点和网络能耗。
在本实施例中，Hub在所述第一信标期中，将确定的用于节点发送紧急业务的第一时隙期所需时隙数以及在用于节点发送普通业务的第二时隙期中为每个节点分配的时隙，通过第一信标帧发布给接入网络的节点。
在本实施例中，Hub在所述第一时隙期中，接收节点发送的紧急业务。
在本实施例中，Hub在所述第二时隙期中，接收节点发送的基于TDMA的普通业务，和/或，获取节点对于额外时隙的申请信息。
优选地，Hub获取节点对于额外时隙的申请信息可以包括以下至少之一：Hub接收节点发送的标记业务类型为“紧急业务”的申请信息，其中包含所需时隙数；和/或，Hub确定节点的业务发送失败，向所述节点发送失败响应(NACK)信号，并认为所述节点申请了标记业务类型为“发送失败业务”的申请信息，其中所需时隙数为发送失败的所述业务的时隙数；和/或，Hub接收节点发送的标记业务类型为“其他普通业务”的申请信息，其中包含所需时隙数。
优选地，在Hub接收节点发送的基于时分双工(Time Division Multiple Access，简称为TDMA)的普通业务，和/或，获取节点对于额外时隙的申请信息之后，Hub还可以向所述节点发送响应信息，其中，所述响应信息可以包括以下之一：在Hub成功 接收到节点发送的信息且该节点未申请额外时隙的情况下，向所述节点发送成功响应(ACK)和不在第二信标期打开无线通信指令OFF(即指示在第二信标期关闭无线通信的指令)；
在Hub成功接收到节点发送的信息且该节点申请额外时隙的情况下，向所述节点发送成功响应(ACK)和在第二信标期打开无线通信指令ON(即指示在第二信标期开启无线通信的指令)；
在Hub未成功接收到节点发送的信息的情况下，向所述节点发送失败响应(NACK)和在第二信标期打开无线通信指令ON(即指示在第二信标期开启无线通信的指令)。
考虑到相关技术中的信标帧2(Beacon2，图中为B2)的作用仅仅是标示CAP阶段的开始，它的作用可以被进一步开发。例如，Hub可以根据节点在EAP，RAP，MAP阶段的性能(包成功传输个数，是否还有服务请求等等)，得到当前信道的大致情况，对当前帧中的余下部分进行更加合理的安排，并将新的scheduling通过Beacon2发布。
基于上述考虑，在本实施例中，Hub在所述第二信标期中，将确定的第三时隙期与第四时隙期分别所需时隙数以及在第三时隙期中为每个申请额外时隙的节点分配的时隙，通过第二信标帧发布给接入网络的节点。
优选地，Hub确定第三时隙期与第四时隙期分别所需时隙数可以包括：若当前帧中，节点申请的额外时隙总数大于m，为m+a，且m+a≤k-2，则将第三时隙期的时隙数调整至m+a；如果m+a>k–2，则将第三时隙期的时隙数调整至k-2，并在下一帧中通过第一信标期将第三时隙期与第四时隙期的时隙总数调整至m+a+2；和/或，
若当前帧中，节点申请的额外时隙总数小于m，将第四时隙期的时隙数由n增加至n+b，其中设p为网络中平均睡眠节点数，如果n+b>2p，则在下一帧中通过第一信标期将第三时隙期与第四时隙期的时隙总数调整至k-(n+b-2p)；
其中m为上一帧中第三时隙期的时隙数，n为上一帧中第四时隙期的时隙数，k＝m+n，b即为第四时隙期增加的时隙数。
优选地，Hub在第三时隙期中为每个申请额外时隙的节点分配时隙可以包括：
Hub首先为申请设置为发送紧急业务的额外时隙的节点分配时隙(即上文中申请标记业务类型为“紧急业务”的节点)；在完成分配用于发送紧急业务的额外时隙之后，Hub再为申请设置为重发发送失败的业务的节点分配时隙(即上文中申请标记业务类 型为“发送失败业务”的节点)；在完成分配用于重发发送失败的业务的额外时隙之后，Hub最后为申请设置为继续发送普通业务的节点分配时隙(即上文中申请标记业务类型为“其他普通业务”的节点)；其中，对于这一帧中未分配到时隙的节点，Hub在下一帧的第三时隙期中同类型的节点中优先为其分配时隙，例如，如果是“其他普通业务”类型的节点未分配到时隙，则在下一帧的第三时隙期中分配给“其他普通业务”类型的时隙中优先分配给该节点发送；而如果是“发送失败业务”类型的节点未分配到时隙，则在下一帧的第三时隙期中分配给“发送失败业务”类型的时隙中优先分配给该节点发送；对于“紧急业务”类型也是一样。
在本实施例中，Hub在所述第三时隙期中，接收节点补充发送的业务。
在本实施例中，Hub在所述第四时隙期中，接收节点发送的睡眠申请和/或接入申请。
优选地，在Hub接收节点发送的睡眠申请和/或接入申请之后，Hub在下一帧中不在第二时隙期中对发送睡眠申请的节点分配时隙；和/或，Hub在下一帧中在第二时隙期中对发送接入申请的节点分配时隙。
对应于上述的一种WBAN的信息交互方法，在本实施例中还提供了一种WBAN的信息交互装置，位于Hub中，该装置设置为实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图3是根据本发明实施例的一种WBAN的信息交互装置30的结构框图，如图3所示，该装置30包括第一发送模块32和第一接收模块34，下面对各个模块进行详细说明：
第一发送模块32，设置为按照预设的超帧结构向节点发送信标帧；以及，第一接收模块34，设置为按照预设的超帧结构接收节点发送的信息；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期(B1)、第一时隙期(EAP)及第二时隙期(MAP1)，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期(B2)和第三时隙期(MAP2)，所述第三时隙期(CAP)用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
在本实施例中，还提供了另一种WBAN的信息交互方法，图4是根据本发明实施例的另一种WBAN的信息交互方法的流程图，如图4所示，该方法包括如下步骤：
步骤S402，节点(Sensor)按照预设的超帧结构向基站(Hub)发送信息以及接收Hub发送的信标帧；
其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
在本实施例中，节点在所述第一信标期中，通过接收Hub发送的第一信标帧获取用于节点发送紧急业务的第一时隙期所需时隙数以及在用于节点发送普通业务的第二时隙期中为当前节点分配的时隙。
在本实施例中，节点在所述第一时隙期中，判断自身是否存在紧急业务需要发送；如果是，所述节点竞争接入信道并向Hub发送紧急业务；如果未竞争接入信道成功，则所述节点标记自身为有紧急业务需要发送。
在本实施例中，节点在所述第二时隙期中，按照第一信标期中Hub发布的用于当前节点发送基于TDMA的普通业务的时隙发送普通业务，和/或，发送对于额外时隙的申请信息。
优选地，节点发送对于额外时隙的申请信息可以包括以下至少之一：节点发送标记业务类型为紧急业务的申请信息，其中包含所需时隙数；节点发送标记业务类型为其他普通业务的申请信息，其中包含所需时隙数。
在本实施例中，节点在所述第二信标期中，通过接收Hub发布的第二信标帧获取第三时隙期与第四时隙期分别所需时隙数以及在第三时隙期中为申请额外时隙的节点分配的时隙。
在本实施例中，节点在所述第三时隙期中，按照第二信标期中Hub发布的为申请额外时隙的节点分配的时隙补充发送业务。
在本实施例中，节点在所述第四时隙期中，竞争接入信道并向Hub发送睡眠申请和/或接入申请。
优选地，在节点竞争接入信道并向Hub发送睡眠申请和/或接入申请之后，如果节点向Hub发送了睡眠申请，则所述节点在下一帧中进入睡眠状态；和/或，如果节点向Hub发送了接入申请，则所述节点在下一帧的第一信标期中接收Hub为其分配的时隙。
对应于上述另一种WBAN的信息交互方法，在本实施例中还提供了另一种WBAN的信息交互装置，位于节点中，图5是根据本发明实施例的另一种WBAN的信息交互装置50的结构框图，如图5所示，该装置50包括第二发送模块52和第二接收模块54，下面对各个模块进行详细说明：
第二发送模块52，设置为按照预设的超帧结构向Hub发送信息；以及，第二接收模块54，设置为按照预设的超帧结构接收Hub发送的信标帧；其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
在本实施例中，还提供了一种WBAN的信息交互系统，图6是根据本发明实施例的WBAN的信息交互系统的结构框图，如图6所示，该系统包括如图3所示的位于Hub中的WBAN的信息交互装置30，还包括如图5所示的位于节点中的WBAN的信息交互装置50。
下面结合优选实施例进行说明，以下优选实施例结合了上述实施例及其优选实施方式。
在以下优选实施例中，提供了一种时隙高效利用的无线体域网媒质接入控制方法，该方法基于IEEE，在保证分组成功接入信道的前提下，很大程度减小发送失败的几率，很大程度利用时隙并尽可能保证紧急业务的优先传输，同时降低节点和网络能耗。
本优选实施例提供的高效无线体域网媒质接入控制方法，采用了补充发送的方法，具体包括如下步骤：发送第一个信标帧B1；节点竞争接入信道，进行紧急业务传输；基于TDMA方式的普通业务传输，在此时期节点同时发送额外时隙申请；在信标帧B2期间根据节点额外时隙申请信息，规划后面MAP2与CAP所占时隙，并为相应节点分配MAP2的时隙；相应节点在MAP2时隙期发送额外业务；CAP时隙期，节点申请睡眠、新节点或睡眠节点接入网络。本优选实施例的方法通过补充发送，进行时隙再分配，增强了通信的鲁棒性，使得时隙更加紧凑，减少了不必要的时隙存在，同时，相比IEEE，该方法更多采用TDMA方式进行业务传输，另外，节点更少的处于通信状态，降低了功耗。
下面以星形拓扑网络为例进行说明，由一个基站(Hub)与不同的节点(Sensor)组成，本优选实施例在原超帧的基础上提出改进方法，图7是根据本发明优选实施例的WBAN协议的超帧结构示意图，如图7所示，将超帧定义为三个阶段：第一个阶段是节点正常发送业务阶段，包括信标期和两个不同时隙期(EAP和MAP1)，两个时隙期分别用来发送紧急业务和普通业务；第二阶段是补充发送业务阶段，第一阶段出现的紧急业务、发送失败的普通业务、额外的业务在这一阶段发送，这一阶段包括信标期和一个时隙期(MAP2)；第三阶段是处理新节点和睡眠节点时期，这一阶段包括一个时隙期(CAP)。
本优选实施例采用一种补充发送的方法，根据第一阶段发送状况对第二阶段时隙做出合理调整，这样，第二阶段补充了第一阶段，提高了通信的鲁棒性，并且充分利用了时隙。本优选实施例采用的补充发送的方法所实现工作流程详细描述如下：
步骤一：发送信标帧B1。
Hub根据接入网络的节点数以及对应节点的采样率信息，为每个节点分配时隙，并确定处理紧急业务时期EAP所需时隙数。Hub将这些信息通过信标帧B1发送给接入网络中的节点。这些信息具体包括同步信息以及EAP所占时隙数，MAP1所占时隙数。
对应的，对于接入网络中的节点，在此时期打开无线通信，接收信息，并根据接收到的信息计算下次打开无线通信时间。计算方法为：1.如果已被分配时隙，则在对应的时隙打开无线通信；2.如果没有被分配时隙，则在下一帧开始时打开无线通信。
步骤二：紧急业务传输。
在节点采集人体信息的过程中可能会遇到某些信息突变的现象，如采集到的血压信号骤然升高，可以定义类似这样的信息为紧急业务。本优选实施例提出的帧结构中EAP时期即是用来应对紧急业务，这一时期节点竞争接入信道，Hub与接入信道的节点进行通信，接收紧急业务。
对应的，在此时期，对于每个节点，判断自己是否有紧急业务需要发送，如果有，则打开无线通信，与其他节点竞争接入信道。如果成功接入，则发送信息；如果在整个EAP时期，该节点未能成功接入信道，则标记自己为“有紧急业务需发送”(该紧急业务将在后续阶段发送)。
步骤三：基于TDMA的普通业务传输。
对于每个节点，判断自己分配的时隙是否到来，如果没有到来，无线通信处于关闭状态；如果分配时隙到来，节点打开无线通信，发送信息。发送的信息中除了采样信息外，包含有额外时隙的申请信息。
对于额外时隙的申请信息解释如下：1.对一个节点，如果该节点在EAP期间有未成功发送的紧急业务或者临时产生了紧急业务，则该节点发送的申请信息标记业务类型为“紧急业务”，并包含所需时隙数；2.如果发送普通业务后，节点收到了Hub回复的NACK信号，则表示业务发送失败，这里节点不再发送申请信息，但Hub已经清楚该节点发送失败的时隙数，所以等效于节点发送了申请信息，业务类型为“发送失败业务”；3.如果节点在其分配的时隙结束时，依然有额外的信息尚未发送，该节点发送的申请信息标记业务类型为“其他普通业务”，并包含所需时隙数。
在节点发送信息结束后，Hub应回复该节点相应的信息。该信息由两个指令构成，分别是是否收到信息指令(ACK/NACK)和是否在B2时隙期打开无线通信指令(ON/OFF)：1.如果Hub成功接收到了节点发送的信息，并且该节点没有申请额外时隙，则回复该节点ACK、OFF；2.如果Hub成功接收到了节点发送的信息，并且该节点已申请额外时隙，则回复该节点ACK、ON；3.如果Hub没有接收到节点发送的信息，则回复该节点NACK、ON，表示该节点在后续时隙期需要重新发送信息。
步骤四：发送信标帧B2。
对于某节点，如果它已申请额外时隙，则在B2期间打开接收机，否则关闭无线通信。B2时隙期，Hub需要完成两个任务：1.规划MAP2与CAP各自所占时隙数；2.将MAP2时隙分配给相关节点，并发布时隙分配信息。
可以规定MAP2与CAP所占时隙数是可以调整的，但两者之和在一帧开始时已经固定，在不同帧中可以调整。所以，在B2期间，Hub需要计算的是如何将一定时隙数分配给MAP2与CAP。算法如下：
首先，假设上一帧中MAP2时隙数为m，CAP时隙数为n，m+n＝k.
1.若当前帧中，MAP2所需时隙数大于m(节点申请的额外时隙总数大于m)，则按需求增大MAP2所占时隙数，假设时隙数从m增加至m+a，可以满足需求。如果m+a≤k-2，则将MAP2所占时隙数调整至m+a；如果m+a>k–2，则将MAP2所占时隙数调整至k-2，并在下一帧中通过B1将MAP2与CAP所占时隙总数调整至m+a+2。
2.若当前帧中，MAP2所需时隙数小于m，则减小MAP2所占时隙数，增大CAP所占时隙数，并假设CAP所占时隙数由n增加至n+b。设p为网络中平均睡眠节点数，如果n+b>2p，则在下一帧中通过B1将MAP2与CAP所占时隙总数调整至k-(n+b-2p)。
Hub在完成MAP2与CAP时隙的分配后。需要将MAP2时隙分配给相应节点。分配方法如下：
若当前分配的MAP2所占时隙数可以满足所有额外时隙申请。则按“紧急业务”、“发送失败业务”、“其他普通业务”依次为对应节点分配时隙。若当前分配的MAP2所占时隙数不能满足所有额外时隙申请。则首先为“紧急业务”类型的节点分配时隙，其次是“发送失败业务”类型，最后是“其他普通业务”类型的节点。对于没有被分配到时隙的节点，Hub将其优先级提高，在下一帧中的MAP2为其分配时隙。其中，优先级是对于同业务类型而言，即“紧急业务”优先级高于“发送失败业务”类型，“发送失败业务”优先级高于“其他普通业务”类型。
步骤五：基于TDMA的补充业务传输。
MAP2与MAP1过程基本相同，Hub与对应节点依次通信，不同的是MAP2期间，节点仅仅发送业务信息，不再发送额外时隙申请信息。
步骤六：新节点或睡眠节点接入网络。
实际应用中，往往会有新的节点需要接入网络；另外，由于节点采样率不同，一些采样率低的节点不需要每一帧都发送信息，可以通过让其睡眠的方式来降低功耗，睡眠节点要发送信息时需要重新接入网络。超帧中最后一个时隙期CAP，即是用于处理新节点与睡眠节点的传输需求。可以看到，在步骤四的算法中保证了CAP至少占有两个时隙。
CAP时隙期，节点采用竞争接入的方式。对一个接入网络的节点，如果它需要睡眠，那么会在该时隙期打开无线通信侦听信道，竞争接入，成功接入后向Hub发送睡眠申请，得到允许后，在下一帧中进入睡眠状态。对新节点或需要重新接入网络的睡眠节点，同样打开无线通信，竞争接入；成功接入后，向Hub发送申请接入信息，得到允许后，在下一帧中参与通信过程，相应的，Hub会在下一帧B1期间为其分配时隙。
图8是根据本发明优选实施例的超帧中Hub工作流程示意图，图9是根据本发明优选实施例的超帧中节点工作流程示意图，本优选实施例采用的补充发送的方法所实现的步骤可参见图8与图9。
本优选实施例提供的方案具有下述优点：
1.改进了原协议不必要的竞争期，更多的采用TDMA结构，并且从上述步骤中可以看到，传感器节点仅在很少的情况下打开无线通信，而更多的处于非通信状态，减少了不必要的竞争，降低了功耗。
2.利用超帧中的第二个信标帧进行时隙再分配，使得帧结构中时隙利用更加充分，减少了不必要的并没有信息传输的时隙存在。
3.通过补充发送的方法增强了通信的鲁棒性。
本优选实施例用于位于人体的传感器与基站的通信，图10是根据本发明优选实施例的系统模型示意图，网络结构如图10所示，人体体表或体内分布有不同采样率的传感器节点，基站一般位于人体附近，如置于卧室内，基站将采集到的人体信息通过其他网络如WIFI、3G、4G等发送到某些医疗结构，实现对人体健康状况的长期远程监控。
传感器与基站的通信包括步骤如下：
步骤一：发送信标帧B1。
Hub将时隙分配信息以及同步信息通过信标帧B1广播给网络中的节点；对应的，接入网络的节点，在此时期打开无线通信，接收信息，之后关闭无线通信，并根据接收到的信息计算下次打开无线通信时间。
步骤二：紧急业务传输。
某些节点可能会产生突变采样信息，通常这些信息伴随着人体的病变，需要得到及时发送。在帧结构中的EAP时隙期，节点通过竞争接入的方式，发送紧急业务。竞争优先级可视节点类型以及采样信息突变程度而定，对于没有成功接入信道的节点，标记自己为“有紧急业务需发送”，在MAP1时隙期向Hub申请时隙，申请成功后将在MAP2时隙期发送信息。
步骤三：基于TDMA的普通业务传输。
对网络中的每个节点，如果自己被分配的时隙到来，则打开无线通信与基站进行通信，在通信过程中，不仅发送采样信息，还需发送额外业务申请信息。相应的，Hub接收来自各个节点的信息，并记录额外业务申请信息。
步骤四：发送信标帧B2。
对网络中的每个节点，如果它已申请额外时隙，则在B2期间打开接收机，否则关闭无线通信。B2期间，Hub需要完成两个任务：1.根据额外业务申请信息规划分配MAP2与CAP各自所占时隙数，2.将MAP2时隙分配给相关节点，并通过B2发布时隙分配信息。
我们规定MAP2与CAP所占时隙数是可以调整的，但两者之和在一帧开始时已经固定，在不同帧中可以调整。所以，在B2期间，Hub需要计算的是如何将一定时隙数分配给MAP2与CAP。算法如下：
首先，我们假设上一帧中MAP2时隙数为m，CAP时隙数为n，m+n＝k。
1.若当前帧中，MAP2所需时隙数大于m(节点申请的额外时隙总数大于m)，则按需求增大MAP2所占时隙数，假设时隙数从m增加至m+a，可以满足需求。如果m+a≤k-2，则将MAP2所占时隙数调整至m+a；如果m+a>k–2，则将MAP2所占时隙数调整至k-2，并在下一帧中通过B1将MAP2与CAP所占时隙总数调整至m+a+2。
2.若当前帧中，MAP2所需时隙数小于m，则减小MAP2所占时隙数，增大CAP所占时隙数，并假设CAP所占时隙数由n增加至n+b。设p为网络中平均睡眠节点数，如果n+b>2p，则在下一帧中通过B1将MAP2与CAP所占时隙总数调整至k-(n+b-2p)。
Hub在完成MAP2与CAP时隙的分配后。需要将MAP2时隙分配给相应节点。分配方法如下：
若当前分配的MAP2所占时隙数可以满足所有额外时隙申请。则按“紧急业务”、“发送失败业务”、“其他普通业务”依次为对应节点分配时隙。若当前分配的MAP2所占时隙数不能满足所有额外时隙申请。则首先为“紧急业务”类型的节点分配时隙，其次是“发送失败业务”类型，最后是“其他普通业务”类型的节点。对于没有被分配到时隙的节点，Hub将其优先级提高，在下一帧中的MAP2为其分配时隙。其中， 优先级是对于同业务类型而言，即“紧急业务”优先级始终高于“发送失败业务”类型，“发送失败业务”优先级始终高于“其他普通业务”类型。
步骤五：基于TDMA的补充业务传输。
Hub与有额外业务发送且被分配到时隙的节点依次通信。
步骤六：新节点或睡眠节点接入网络。
由于节点采样率不同，一些采样率低的节点不需要每一帧都发送信息，可以通过让其睡眠的方式来降低功耗，睡眠节点要发送信息时需要重新接入网络；另外，网络中往往会有新的节点需要接入网络。超帧最后一个时隙期CAP，即用于节点接入网络。如果某节点需要睡眠，在该时隙期打开无线通信侦听信道，竞争接入，得到睡眠允许后，在下一帧中进入睡眠状态；对需要接入网络的节点，打开无线通信，竞争接入，成功接入后，向Hub发送申请接入信息，得到回复后，在下一帧中进行信息发送。
在另外一个实施例中，还提供了一种软件，该软件用于执行上述实施例及优选实施例中描述的技术方案。
在另外一个实施例中，还提供了一种存储介质，该存储介质中存储有上述软件，该存储介质包括但不限于光盘、软盘、硬盘、可擦写存储器等。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
如上所述，本发明实施例提供的一种WBAN的信息交互方法、装置及系统，具有以下有益效果：解决了相关技术中的WBAN的信令传输结构存在的问题，达到了在保 证分组成功接入信道的前提下，很大程度减小发送失败的几率，更大程度利用时隙并尽可能保证紧急业务的优先传输，同时降低节点和网络能耗的效果。

Claims (24)

  1. 一种无线体域网WBAN的信息交互方法，包括：
    基站Hub按照预设的超帧结构向节点Sensor发送信标帧以及接收节点发送的信息；
    其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
  2. 根据权利要求1所述的方法，其中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：
    Hub在所述第一信标期中，将确定的用于节点发送紧急业务的第一时隙期所需时隙数以及在用于节点发送普通业务的第二时隙期中为每个节点分配的时隙，通过第一信标帧发布给接入网络的节点。
  3. 根据权利要求1所述的方法，其中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：
    Hub在所述第一时隙期中，接收节点发送的紧急业务。
  4. 根据权利要求1所述的方法，其中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：
    Hub在所述第二时隙期中，接收节点发送的基于TDMA的普通业务，和/或，获取节点对于额外时隙的申请信息。
  5. 根据权利要求4所述的方法，其中，Hub获取节点对于额外时隙的申请信息包括以下至少之一：
    Hub接收节点发送的标记业务类型为紧急业务的申请信息，其中包含所需时隙数；
    Hub确定节点的业务发送失败，向所述节点发送失败响应NACK信号，并认为所述节点申请了标记业务类型为发送失败业务的申请信息，其中所需时隙数为发送失败的所述业务的时隙数；
    Hub接收节点发送的标记业务类型为其他普通业务的申请信息，其中包含所需时隙数。
  6. 根据权利要求5所述的方法，其中，在Hub接收节点发送的基于TDMA的普通业务，和/或，获取节点对于额外时隙的申请信息之后，还包括：
    Hub向所述节点发送响应信息，其中，所述响应信息包括以下之一：
    在Hub成功接收到节点发送的信息且该节点未申请额外时隙的情况下，向所述节点发送成功响应ACK和不在第二信标期打开无线通信指令OFF；
    在Hub成功接收到节点发送的信息且该节点申请额外时隙的情况下，向所述节点发送成功响应ACK和在第二信标期打开无线通信指令ON；
    在Hub未成功接收到节点发送的信息的情况下，向所述节点发送失败响应NACK和在第二信标期打开无线通信指令ON。
  7. 根据权利要求1所述的方法，其中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：
    Hub在所述第二信标期中，将确定的第三时隙期与第四时隙期分别所需时隙数以及在第三时隙期中为每个申请额外时隙的节点分配的时隙，通过第二信标帧发布给接入网络的节点。
  8. 根据权利要求7所述的方法，其中，Hub确定第三时隙期与第四时隙期分别所需时隙数包括：
    若当前帧中，节点申请的额外时隙总数大于m，为m+a，且m+a≤k-2，则将第三时隙期的时隙数调整至m+a；如果m+a>k–2，则将第三时隙期的时隙数调整至k-2，并在下一帧中通过第一信标期将第三时隙期与第四时隙期的时隙总数调整至m+a+2；和/或，
    若当前帧中，节点申请的额外时隙总数小于m，将第四时隙期的时隙数由n增加至n+b，其中设p为网络中平均睡眠节点数，如果n+b>2p，则在下一帧中通过第一信标期将第三时隙期与第四时隙期的时隙总数调整至k-(n+b-2p)；
    其中m为上一帧中第三时隙期的时隙数，n为上一帧中第四时隙期的时隙数，k＝m+n。
  9. 根据权利要求7所述的方法，其中，Hub在第三时隙期中为每个申请额外时隙的节点分配时隙包括：
    Hub为申请设置为发送紧急业务的额外时隙的节点分配时隙；
    在完成分配用于发送紧急业务的额外时隙之后，Hub为申请设置为重发发送失败的业务的节点分配时隙；
    在完成分配用于重发发送失败的业务的额外时隙之后，Hub为申请设置为继续发送普通业务的节点分配时隙；
    其中，对于未分配到时隙的节点，Hub在下一帧中的第三时隙期中同类型的节点中优先为其分配时隙。
  10. 根据权利要求1所述的方法，其中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：
    Hub在所述第三时隙期中，接收节点补充发送的业务。
  11. 根据权利要求1所述的方法，其中，Hub按照预设的超帧结构向节点发送信标帧以及接收节点发送的信息包括：
    Hub在所述第四时隙期中，接收节点发送的睡眠申请和/或接入申请。
  12. 根据权利要求11所述的方法，其中，在Hub接收节点发送的睡眠申请和/或接入申请之后，还包括：
    Hub在下一帧中不在第二时隙期中对发送睡眠申请的节点分配时隙；和/或，
    Hub在下一帧中在第二时隙期中对发送接入申请的节点分配时隙。
  13. 一种无线体域网WBAN的信息交互方法，包括：
    节点Sensor按照预设的超帧结构向基站Hub发送信息以及接收Hub发送的信标帧；
    其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
  14. 根据权利要求13所述的方法，其中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：
    节点在所述第一信标期中，通过接收Hub发送的第一信标帧获取用于节点发送紧急业务的第一时隙期所需时隙数以及在用于节点发送普通业务的第二时隙期中为当前节点分配的时隙。
  15. 根据权利要求13所述的方法，其中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：
    节点在所述第一时隙期中，判断自身是否存在紧急业务需要发送；
    如果是，所述节点竞争接入信道并向Hub发送紧急业务；
    如果未竞争接入信道成功，则所述节点标记自身为有紧急业务需要发送。
  16. 根据权利要求13所述的方法，其中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：
    节点在所述第二时隙期中，按照第一信标期中Hub发布的用于当前节点发送基于TDMA的普通业务的时隙发送普通业务，和/或，发送对于额外时隙的申请信息。
  17. 根据权利要求16所述的方法，其中，节点发送对于额外时隙的申请信息包括以下至少之一：
    节点发送标记业务类型为紧急业务的申请信息，其中包含所需时隙数；
    节点发送标记业务类型为其他普通业务的申请信息，其中包含所需时隙数。
  18. 根据权利要求13所述的方法，其中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：
    节点在所述第二信标期中，通过接收Hub发布的第二信标帧获取第三时隙期与第四时隙期分别所需时隙数以及在第三时隙期中为申请额外时隙的节点分配的时隙。
  19. 根据权利要求13所述的方法，其中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：
    节点在所述第三时隙期中，按照第二信标期中Hub发布的为申请额外时隙的节点分配的时隙补充发送业务。
  20. 根据权利要求13所述的方法，其中，节点按照预设的超帧结构向Hub发送信息以及接收Hub发送的信标帧包括：
    节点在所述第四时隙期中，竞争接入信道并向Hub发送睡眠申请和/或接入申请。
  21. 根据权利要求20所述的方法，其中，在节点竞争接入信道并向Hub发送睡眠申请和/或接入申请之后，还包括：
    如果节点向Hub发送了睡眠申请，则所述节点在下一帧中进入睡眠状态；和/或，
    如果节点向Hub发送了接入申请，则所述节点在下一帧的第一信标期中接收Hub为其分配的时隙。
  22. 一种无线体域网WBAN的信息交互装置，位于基站Hub中，包括：
    第一发送模块，设置为按照预设的超帧结构向节点Sensor发送信标帧；以及，
    第一接收模块，设置为按照预设的超帧结构接收节点发送的信息；
    其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
  23. 一种无线体域网WBAN的信息交互装置，位于节点Sensor中，包括：
    第二发送模块，设置为按照预设的超帧结构向基站Hub发送信息；以及，
    第二接收模块，设置为按照预设的超帧结构接收Hub发送的信标帧；
    其中，所述超帧结构包括三个阶段，第一阶段包括第一信标期、第一时隙期及第二时隙期，所述第一时隙期和第二时隙期分别用于节点发送紧急业务和普通业务；第二阶段包括第二信标期和第三时隙期，所述第三时隙期用于节点补充发送业务；第三阶段包括第四时隙期，所述第四时隙期用于节点发送睡眠申请和/或接入申请。
  24. 一种无线体域网WBAN的信息交互系统，包括如权利要求22所述的位于基站Hub中的WBAN的信息交互装置，还包括如权利要求23所述的位于节点Sensor中的WBAN的信息交互装置。
PCT/CN2014/093404 2014-08-04 2014-12-09 Wban的信息交互方法、装置及系统 WO2015154499A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14888694.8A EP3179785B1 (en) 2014-08-04 2014-12-09 Information interaction method, device and system for wban
US15/501,529 US10219218B2 (en) 2014-08-04 2014-12-09 Information interaction method, device and system for wireless body area network (WBAN)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410379917.7 2014-08-04
CN201410379917.7A CN105323832B (zh) 2014-08-04 2014-08-04 Wban的信息交互方法、装置及系统

Publications (1)

Publication Number Publication Date
WO2015154499A1 true WO2015154499A1 (zh) 2015-10-15

Family

ID=54287243

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/093404 WO2015154499A1 (zh) 2014-08-04 2014-12-09 Wban的信息交互方法、装置及系统

Country Status (4)

Country Link
US (1) US10219218B2 (zh)
EP (1) EP3179785B1 (zh)
CN (1) CN105323832B (zh)
WO (1) WO2015154499A1 (zh)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10454768B2 (en) 2013-11-15 2019-10-22 F5 Networks, Inc. Extending policy rulesets with scripting
CN107113823B (zh) * 2015-07-10 2020-04-28 华为技术有限公司 信道接入期的分配方法、装置及系统
KR101988861B1 (ko) * 2016-03-02 2019-06-13 한국전자통신연구원 네트워크 접속 방법 및 네트워크 장치
US10326700B1 (en) * 2016-03-29 2019-06-18 F5 Networks, Inc. Hash based per subscriber DNS based traffic classification
CN109714812B (zh) * 2019-01-07 2021-04-27 西安电子科技大学 基于tdma的低功耗分布式介质访问控制方法
EP3694166B1 (en) * 2019-02-06 2022-09-21 Hitachi Energy Switzerland AG Cyclic time-slotted operation in a wireless industrial network
CN110167115A (zh) * 2019-05-20 2019-08-23 河南科技大学 基于唤醒机制的无线体域网mac协议、通信方法及系统
CN110517750A (zh) * 2019-08-21 2019-11-29 兰州交通大学 一种融合wifi定位与惯性传感的多人动作捕捉方法
CN111132261B (zh) * 2019-12-03 2022-09-20 华南理工大学 基于步态周期的功率控制，中继选择和时隙分配方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101321127A (zh) * 2008-07-21 2008-12-10 重庆邮电大学 工业无线网络的一种确定性通信调度方法
CN102123515A (zh) * 2011-03-10 2011-07-13 西安电子科技大学 无线体域网中基于超帧的高效媒体接入控制方法
WO2012161396A1 (ko) * 2011-05-25 2012-11-29 경희대학교 산학협력단 응급 데이터 처리가 가능한 무선 신체 통신 망에서의 맥 프로토콜 및 이를 이용한 무선 네트워크 통신 방법
CN103281793A (zh) * 2013-05-30 2013-09-04 重庆邮电大学 适用于无线体域网紧急状态下的节点动态调度方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7385953B2 (en) * 2004-10-26 2008-06-10 At&T Mobility Ii Llc Method and apparatus for allocating a beacon signal in a wireless communications network
KR101612552B1 (ko) * 2009-09-22 2016-04-15 삼성전자주식회사 다중형식 비콘 운용 방법
US8976763B2 (en) * 2009-12-21 2015-03-10 Telecommunications Research Laboratories Method and system for allocation guaranteed time slots for efficient transmission of time-critical data in IEEE 802.15.4 wireless personal area networks
CN102958062B (zh) * 2012-10-19 2015-02-04 上海交通大学无锡研究院 一种无线体域网中基于超帧的低能耗媒体接入控制方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101321127A (zh) * 2008-07-21 2008-12-10 重庆邮电大学 工业无线网络的一种确定性通信调度方法
CN102123515A (zh) * 2011-03-10 2011-07-13 西安电子科技大学 无线体域网中基于超帧的高效媒体接入控制方法
WO2012161396A1 (ko) * 2011-05-25 2012-11-29 경희대학교 산학협력단 응급 데이터 처리가 가능한 무선 신체 통신 망에서의 맥 프로토콜 및 이를 이용한 무선 네트워크 통신 방법
CN103281793A (zh) * 2013-05-30 2013-09-04 重庆邮电大学 适用于无线体域网紧急状态下的节点动态调度方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3179785A4 *

Also Published As

Publication number Publication date
EP3179785A1 (en) 2017-06-14
US20170238250A1 (en) 2017-08-17
EP3179785B1 (en) 2018-11-14
CN105323832B (zh) 2019-12-31
CN105323832A (zh) 2016-02-10
US10219218B2 (en) 2019-02-26
EP3179785A4 (en) 2017-08-23

Similar Documents

Publication Publication Date Title
WO2015154499A1 (zh) Wban的信息交互方法、装置及系统
US10080195B2 (en) Access and power management for centralized networks
Rajandekar et al. A survey of MAC layer issues and protocols for machine-to-machine communications
CN102804694B (zh) 用于管理紧急事件的终端设备、协调器及方法
CN102123515B (zh) 无线体域网中基于超帧的高效媒体接入控制方法
CN103874171B (zh) 人体通信装置中的数据发送和接收方法
US9847827B2 (en) Method and system for transmitting data in wireless local area network
CN104918290B (zh) 一种数据传输方法
Lin et al. Channel-aware polling-based MAC protocol for body area networks: Design and analysis
CN103826316A (zh) 一种微功率无线自组织网络广播通信方法
US20150230247A1 (en) Method for transmitting data, method for receiving data, and device
Saboor et al. Dynamic slot allocation using non overlapping backoff algorithm in IEEE 802.15. 6 WBAN
WO2014176979A1 (zh) 无线电唤醒方法和无线电唤醒电路
US10575301B2 (en) Acquisition method for data in wireless body area network and central device
WO2015184854A1 (zh) 一种实现mac层接入的方法及传感器节点
Huang et al. Analysis and comparison of the IEEE 802.15. 4 and 802.15. 6 wireless standards based on MAC layer
WO2018171374A1 (zh) 信道接入的指示方法和设备
Chen Mm-qos for ban: Multi-level mac-layer qos design in body area networks
Bouani et al. A comprehensive survey of medium access control protocols for wireless body area networks
Kim et al. An effect of delay reduced MAC protocol for WBAN based medical signal monitoring
Kamble et al. Improved MAC protocol for emergency handling in WBAN
CN104640213B (zh) 一种无线体域网的连接建立方法
Kaur et al. Wireless body area network: Performance analysis of polling access MAC protocol
Zhang et al. On energy-delay efficiency for WBAN: a multi-channel scheme
Sadra et al. On improving the saturation performance of IEEE802. 15.6-based MAC protocols in Wireless Body Area Networks

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14888694

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2014888694

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2014888694

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE