CN106332292A - Interference-resistant device, method and system applied to wireless body area network - Google Patents

Interference-resistant device, method and system applied to wireless body area network Download PDF

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Publication number
CN106332292A
CN106332292A CN201510336581.0A CN201510336581A CN106332292A CN 106332292 A CN106332292 A CN 106332292A CN 201510336581 A CN201510336581 A CN 201510336581A CN 106332292 A CN106332292 A CN 106332292A
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wban
hub
frequency hopping
adjacent
ban
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王乐菲
王昊
田军
范小菁
易粟
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to CN201510336581.0A priority Critical patent/CN106332292A/en
Priority to JP2016119099A priority patent/JP2017011701A/en
Publication of CN106332292A publication Critical patent/CN106332292A/en
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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
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance

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

Abstract

Embodiments of the invention provide an interference-resistant device, method and system applied to a wireless body area network (WBAN). The device is applied to a HUB of the WBAN and comprises an acquisition unit, a determination unit, and a processing unit. The acquisition unit is used for obtaining BAN ID, HUB ID, BAN priority, frequency hopping period, time information use for time alignment and frequency hopping information for calculating frequency hopping sequence of an adjacent WBAN. The determination unit determines whether to carry out conflict avoidance according to the WBAN to which the HUB belongs and the BAN priority and/or channel frequency hopping period of the adjacent WBAN. The processing unit carries out conflict avoidance according to the frequency hopping information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN when the HUB carries out conflict avoidance. By the embodiments, the channel collision probability is reduced, and interference between two adjacent or overlapped WBANs can be well avoided.

Description

Interference avoidance device, method and system applied to wireless body area network
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an apparatus, a method, and a system for avoiding interference, which are applied to a Wireless Body Area Network (WBAN).
Background
IEEE 802.15.6 is a standard applied to wireless body area networks. This standard is intended to define a short-range wireless communication network with high reliability, low power consumption and scalability. However, wireless body area networks with adjacent or overlapping coverage areas can cause interference to neighboring networks.
Fig. 1 illustrates two wireless body area networks with overlapping coverage areas, namely, a WBAN1 and a WBAN 2. When the two wireless body area networks work on the same channel, the nodes in the coverage area can be interfered by the neighbor networks. For example, node 1 in WBAN1 may experience interference from HUB2 of WBAN2 when HUB1 and HUB2 use the same channel. Similarly, node 5 in the WBAN2 may also experience interference from the HUB1 of the WBAN 1.
In the standard of IEEE 802.15.6, three methods for solving the interference problem are proposed.
The method comprises the following steps: beacon displacement
In this approach, the HUB needs to select a beacon shift sequence that is not used by the HUBs of its neighboring wireless body area networks to mitigate potential duplicate beacon collisions in the same channel by neighboring or overlapping wireless body area networks and to plan for allocation conflicts. However, this method is only applicable to access schemes using beacons, and for access schemes not using beacons, the interference collision problem cannot be solved by this method.
The second method comprises the following steps: superframe interleaving
This approach is where two adjacent or overlapping HUBs negotiate to occupy the same channel on their own for some period of time. The method avoids collisions and interference by time-dividing the frequency resources to assign the same channel to different wireless body area networks. This approach may require changing the original superframe period (or beacon period) of the wireless body area network. Because the method fixedly divides the same channel into different wireless body area networks for use through negotiation among HUBs, if a wireless body area network is newly added, the negotiation needs to be carried out again, and then the resources of the same channel are divided. Therefore, this approach lacks some flexibility and scalability.
The third method comprises the following steps: frequency hopping
This approach reduces the likelihood of channel collisions by randomly hopping between different channels. Different wireless body area networks use different random seeds to generate different hopping sequences to avoid interference. However, this approach still has limitations. The following illustrates limitations by way of example.
As with the scenario shown in fig. 1, for ease of understanding, it is assumed that the frequency hopping periods of the WBAN1 and the WBAN2 are the same and the start times of the frequency hopping periods are aligned. Here, the hopping random seeds of the WBAN1 and the WBAN2 are 1010001000100011 and 0011000001111010, respectively, and the value at the k-th hopping period can be calculated based on a 16-bit Galois Linear Feedback Shift Register (LFSR). Assuming that 402-405 bands are used, the band is divided into 10 channels according to 802.15.6. Meanwhile, it is assumed that the minimum distance between two consecutive hopping channels is 2. According to the calculation formula of the frequency hopping sequence in 802.15.6, the channels of the WBAN1 and WBAN2 in the k-th frequency hopping period can be calculatedWhere i represents the wireless body area network sequence number. Table 1 shows 20 hop periods for WBAN1 and WBAN2, respectively
Table 1: channel on which WBAN1 and WBAN2 hop periods
It can be seen from table 1 that when k is 2 and k is 15, a collision occurs between WBAN1 and WBAN 2. Within these 20 hop periods, the probability of collision is 10%. Therefore, it can be known that the frequency hopping method cannot completely avoid channel collision, and thus cannot completely avoid interference.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
The embodiment of the invention provides an interference avoiding device, method and system applied to a wireless body area network, which are used for avoiding the interference between two adjacent or overlapped wireless body area networks.
According to a first aspect of embodiments of the present invention, there is provided an apparatus for avoiding interference, which is applied to a HUB (HUB) in a Wireless Body Area Network (WBAN), wherein the apparatus includes:
an acquisition unit that acquires a BAN ID, a HUB ID, a BAN priority, a hop period, time information for time alignment, and hop information for calculating a hop sequence of an adjacent WBAN;
a determining unit, which determines whether to avoid collision according to the BAN priority and/or the channel hopping cycle of the WBAN to which the HUB belongs and the adjacent WBAN;
and the processing unit is used for avoiding collision according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN when the HUB carries out collision avoidance.
According to a second aspect of embodiments of the present invention, there is provided a HUB in a wireless body area network, wherein the HUB (HUB) is configured to:
acquiring BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of adjacent WBAN;
determining whether to avoid collision according to the BAN priority and/or the channel hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;
and if collision avoidance is carried out, collision avoidance is carried out according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN.
According to a third aspect of embodiments of the present invention, there is provided a method for avoiding interference, which is applied to a HUB (HUB) in a Wireless Body Area Network (WBAN), wherein the method includes:
the HUB acquires BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of an adjacent WBAN;
the HUB determines whether to avoid collision according to the BAN priority and/or the channel hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;
and if collision avoidance is carried out, the HUB carries out collision avoidance according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN.
The invention has the beneficial effects that: by the device, the method and the system of the embodiment, the probability of channel collision can be reduced, so that the interference between two adjacent or overlapped WBANs can be better avoided.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of two adjacent wireless body area networks with overlapping coverage areas;
FIG. 2 is a schematic diagram of the interference avoidance apparatus of the present embodiment;
FIG. 3 is a schematic diagram of an example of clock alignment and channel number comparison;
FIG. 4 is a hardware composition diagram of the HUB of the present embodiment;
fig. 5 is a flowchart of a method of avoiding interference of the present embodiment;
fig. 6 is an overall flowchart of the interference avoidance method according to the present embodiment.
Detailed Description
The foregoing and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention is not limited to the embodiments described, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.
Example 1
The present embodiment provides an apparatus for avoiding interference, which is applied to a HUB (HUB, network center control device in IEEE 802.15.6) in a Wireless Body Area Network (WBAN). Fig. 2 is a schematic diagram of the apparatus, and as shown in fig. 2, the apparatus 200 mainly includes: an acquisition unit 201, a determination unit 202, and a processing unit 203. Wherein,
the acquiring unit 201 is configured to acquire a BAN ID, a HUB ID, a BAN priority, a hop period, time information, and hop information of an adjacent WBAN.
The determining unit 202 is configured to determine whether to perform collision avoidance according to BAN priorities and/or hop periods of the WBAN to which the HUB belongs and the adjacent WBANs.
The processing unit 203 is configured to perform collision avoidance according to the frequency hopping information and time information of the WBAN to which the HUB belongs and the frequency hopping information and time information of the adjacent WBAN when collision avoidance is determined.
By the device of the embodiment, the HUB determines whether collision avoidance is performed according to the BAN priority and/or the frequency hopping period of the WBAN to which the HUB belongs and the adjacent WBAN, and when collision avoidance is performed, the HUB performs collision avoidance according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the adjacent WBAN, so that the probability of channel collision can be reduced, and interference can be better avoided.
In this embodiment, the apparatus may further include: a receiving unit 204, which receives the beacon frame or T-Poll frame (timestamp frame) sent by the HUB of the neighboring WBAN. The acquiring unit 201 acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information, and frequency hopping information of the neighboring WBAN from the beacon frame or the T-Poll frame received by the receiving unit 204.
In this embodiment, the HUB of each WBAN periodically broadcasts a beacon frame or T-Poll frame, which contains the BAN ID, HUB ID, BAN priority, hop period, time information, and hop information of the WBAN to which each HUB belongs. The acquiring unit 201 of this embodiment may acquire the information of the neighboring WBAN according to the beacon frame or the T-Poll frame received by the receiving unit 204 and sent by the HUB of the neighboring WBAN.
The time information is used for performing time alignment, and the frequency hopping information is used for calculating a frequency hopping sequence, but this embodiment is not limited thereto, and in a specific implementation process, the time information and the frequency hopping information may be used for other purposes. The time information may be a start time of a frequency hopping period, and the frequency hopping information may include a random seed of frequency hopping, and may further include other information related to calculating a frequency hopping sequence.
In this embodiment, the determining unit 202 may determine whether to perform collision avoidance by the HUB or by the HUBs of the neighboring WBANs according to the levels of BAN priorities and/or the sizes of hopping periods of the two WBANs, for example, may perform collision avoidance by a HUB with a low BAN priority or a small hopping period, and may determine who performs collision avoidance by negotiation if the BAN priorities and the hopping periods are equal.
In one embodiment, as shown in fig. 2, the determining unit 202 may include: a first comparison module 2021, a first determination module 2022, a second comparison module 2023, a second determination module 2024, and a negotiation module 2025, wherein,
the first comparing module 2021 is used for comparing BAN priority of WBAN to which the HUB belongs with BAN priority of the neighboring WBAN.
The first determining module 2022 is configured to determine not to perform collision avoidance when the BAN priority of the WBAN to which the HUB belongs is higher than the BAN priority of the neighboring WBAN; and when the BAN priority of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, determining to perform collision avoidance. That is, the HUB with the lower priority performs collision avoidance.
The second comparing module 2023 is configured to compare the hop period of the WBAN to which the HUB belongs with the hop period of the neighboring WBAN when the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the neighboring WBAN. Wherein, because the BAN priorities are the same, the HUB performing collision avoidance can be determined by comparing the frequency hopping periods.
The second determining module 2024 is configured to determine not to perform collision avoidance when the frequency hopping period of the WBAN to which the HUB belongs is greater than the frequency hopping period of the adjacent WBAN; and when the frequency hopping period of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, determining to perform collision avoidance. That is, the HUB with a small hop period performs collision avoidance.
The negotiating module 2025 is configured to negotiate with the HUB of the neighboring WBAN when the frequency hopping period of the WBAN to which the HUB belongs is equal to the frequency hopping period of the neighboring WBAN, so as to determine whether to perform collision avoidance. Since the BAN priority and the frequency hopping period are the same, the two HUBs may decide who performs collision avoidance through negotiation, and the negotiation method and policy are not limited in this embodiment.
In this embodiment, when the determining unit 202 determines that the HUB performs collision avoidance, the processing unit 203 may perform collision avoidance according to the respective frequency hopping information and time information of the two WBANs (the WBAN to which the HUB belongs and the adjacent WBAN).
In one embodiment, as shown in fig. 2, the processing unit 203 may include: an alignment module 2031, a third comparison module 2032, and a processing module 2033, wherein,
the aligning module 2031 is configured to perform clock alignment on the WBAN to which the HUB belongs and the adjacent WBAN according to the time information of the WBAN to which the HUB belongs and the time information of the adjacent WBAN.
The third comparing module 2032 is configured to compare the channel number in each frequency hopping period of the WBAN to which the HUB belongs with the channel number in the frequency hopping period of the adjacent WBAN corresponding to the frequency hopping period, and determine that there is a conflicting channel number.
The processing module 2033 is configured to change the conflicting channel numbers to be different from the channel numbers of the frequency hopping periods of the neighboring WBANs.
In this embodiment, the aligning module 2031 aligns the clocks of the two WBANs for the convenience of comparing channel numbers, so as to accurately determine whether there is a collision between the two WBANs. In one embodiment, the alignment module 2031 calculates a time difference between two WBANs and performs clock alignment according to the time difference.
The following example shows the method for calculating the time difference between different WBANs by the alignment module 2031, but the embodiment is not limited thereto.
In this example, HUB1 and HUB2 send test frames to each other, assuming that the time at which HUB1 sends test frames to HUB2 is recorded as t at HUB101The time at which the HUB2 received this test frame is recorded as t at HUB202. Let the time at which HUB2 sent a test frame to HUB1 be recorded as t at HUB202', the time at which this test frame was received by the HUB1 is recorded as t at HUB101'. Assume that the transmission times of the test frames sent by HUB1 to HUB2 and HUB2 to HUB1 are the same, and that the time t at which a test frame is transmitted between HUB1 and HUB2 is the samepIs unknown. Let Δ t denote the time difference between WBAN1 and WBAN 2. t is t01,t02,t01' and t02' exchange can be performed between adjacent HUBs. The relationship between the above times is described as shown in formula (1) and formula (2).
t01+Δt+tp＝t02(1)
t02’-Δt+tp＝t01’ (2)
Therefore, the alignment module 2031 may calculate the time difference Δ t between the two WBANs according to the above formula. If Δ t >0, it indicates that the clock of HUB1 is slower than the clock of HUB 2; otherwise, the clock representing HUB1 is faster than the clock of HUB 2. The alignment module 2031 may clock-align the two WBANs according to the time difference by calculating the time difference.
FIG. 3 is a diagram of aligning the start times of the hop periods of the two WBANs, as shown in FIG. 3, assuming that the BAN priority of WBAN1 is higher than WBAN2, and T is greater than WBAN21>T2Wherein T is1And T2Indicating the frequency hopping periods of WBAN1 and WBAN2, respectively, therefore, HUB2 requires active collision avoidance. In this example, the HUB2 has obtained the start time t of a certain hop period of the HUB11The alignment module 2031 of HUB2 calculates t according to the time difference Δ t1Value t at its own clock2As shown in fig. 3. This means t2Is aligned with T1The starting time of (c). This example is for T1>T2When T is the case1≤T2The method is similar.
In this embodiment, after the aligning module 2031 aligns the clocks of the two WBANs, the third comparing module 2032 can compare the channel numbers of the two WBANs. In one embodiment, the third comparing module 2032 may determine whether there is a conflicting channel number according to the channel usage of two WBANs in the same time period, for example, the third comparing module 2032 may compare the channel number in each hop period of the WBAN2 with the channel number in the hop period of the WBAN1 corresponding to each hop period of the WBAN2 to determine that there is a conflicting channel number.
Wherein, ifThe third comparing module 2032 compares the channel number in the mth hop period in the adjacent WBAN with the channel numbers in the nth, n +1, n +2, …,the channel numbers within a hop period are compared to determine which channel numbers are in conflict.
Wherein, ifThe third comparing module 2032 may compare the channel number in the mth hop period in the adjacent WBAN with the channel numbers in the nth, n +1, n +2, …,the channel numbers within a hop period are compared to determine which channel numbers are in conflict.
Wherein, T2Is the length of the frequency hopping period, T, of the WBAN to which the HUB belongs1The length of the frequency hopping period, or T, for the adjacent WBAN2Is the length of the frequency hopping period, T, of the adjacent WBAN1Length of frequency hopping period for WBAN to which the HUB belongs, and T1>T2The time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period is 0 ≦ T2。
Also for the example shown in FIG. 3, set t at the clock of HUB22And T2The time difference of the starting time of (a) is recorded, and 0. ltoreq. T2M is WBAN1 with t1Numbering the hopping periods of the start time, n being t2The number of hop periods in the WBAN2, as shown in fig. 3. If it is notThe third comparing module 2032 records the channel number of the mth hop period (Ch) in the WBAN11(m)) and the nth, n +1, n +2, … of WBAN2,channel number in one hop period (denoted as Ch)2(j) ) a comparison is made; if it is notThe third comparing module 2032 records the channel number of the mth hop period (Ch) in the WBAN11(m)) andthe nth, n +1, n +2, … of WBAN2Channel number in one hop period (denoted as Ch)2(j) ) were compared. Wherein, the WBAN1 is the adjacent WBAN, and the WBAN2 is the WBAN to which the HUB belongs.
According to the above rules, the third comparing module 2032 compares the channel number of the mth hop period of the WBAN1 with the channel numbers of the nth, n +1, n +2, and n +3 hop periods of the WBAN2, and if the channel number of the mth hop period of the WBAN1 is the same as the channel number of the nth, n +1, n +2, or n +3 hop periods of the WBAN2, it is considered that there is a collision, and thus it can be determined that there is a colliding channel number.
According to the above rules, the third comparing module 2032 compares the channel number of the (m +1) th hop period of the WBAN1 with the channel numbers of the (n + 3), n +4, n +5, n +6, and n + 7) th hop periods of the WBAN2, and if the channel number of the (m +1) th hop period of the WBAN1 is the same as the channel number of the (n + 3), n +4, n +5, n +6, or n + 7) th hop period of the WBAN2, it is considered that there is a collision, and thus it can be determined that there is a colliding channel number.
In this embodiment, the processing module 2033 may make the WBAN to which the HUB belongs different from the frequency hopping period of the neighboring WBAN by changing the above mentioned conflicting channel numbers.
Still referring to fig. 3, since the BAN priority of the WBAN2 is less than the BAN priority of the WBAN1, collision avoidance is performed by the HUB2, and the HUB2 may change Ch via the processing module 20332(j) Is made different from Ch1(m)，Ch2(j-1) and Ch2(j +1) and the difference between the channel numbers of two consecutive hops is greater than or equal to a certain minimum interval, where Ch2(j) Refers to all of the m-th channels in WBAN2 and WBAN1 (i.e., Ch)1(m)) channels where collisions occur. Conversely, if the BAN priority of the WBAN2 is greater than the BAN priority of the WBAN1, collision avoidance is performed by the HUB1, and the HUB1 may change Ch via the processing module 20331(m) is made different from Ch2’(j)，Ch1(m-1) and Ch1(m +1) and the difference between the channel numbers of two consecutive hops is greater than or equal to a certain minimum interval, where Ch2' (j) refers to the mth channel in WBAN2 and WBAN1 (i.e., Ch)1(m)) corresponding to all channels. Therefore, the collision probability is reduced, and the interference is avoided.
In an embodiment of this embodiment, as shown in fig. 2, the apparatus 200 may further include a sending unit 204, configured to send a channel hopping message to a node in the WBAN to which the HUB belongs, and inform the node of a channel number of a next hopping period, so that the node changes to a channel corresponding to the channel number when performing frequency hopping. In this embodiment, the HUB may notify the nodes in its WBAN of the channel change to another new channel in the next hop period before changing channels.
In an implementation manner of this embodiment, as shown in fig. 2, the apparatus 200 may further include a broadcasting unit 205, which periodically broadcasts a T-Poll frame or a beacon frame, where the T-Poll frame or the beacon frame includes a BAN ID, a HUB ID, a BAN priority, a frequency hopping period, time information for performing time alignment, and frequency hopping information for calculating a frequency hopping sequence of a WBAN to which the HUB belongs. In this embodiment, the two HUBs exchange the above information by broadcasting a beacon frame or T-Poll frame, as described above. The embodiment is not limited to the manner of broadcasting the beacon frame or the T-Poll frame.
The device for avoiding interference of the embodiment can reduce the collision probability and avoid interference by predicting channel collision by obtaining the relevant frequency hopping information of the adjacent network, is not only suitable for access modes with beacons and without beacons, but also does not need to change the superframe period or the beacon period, and has expandability.
Example 2
The present embodiment provides a HUB in a wireless body area network comprising the apparatus for avoiding interference as described in embodiment 1.
FIG. 4 is a schematic block diagram of the system architecture of the HUB400 of an embodiment of the present invention. As shown in FIG. 4, the HUB400 may include a central processor 401 and a memory 402; the memory 402 is coupled to the central processor 404. Notably, this diagram is exemplary; other types of structures may also be used in addition to or in place of the structure to implement telecommunications or other functions.
In one embodiment, the function of the interference avoidance apparatus may be integrated into the central processor 401.
In another embodiment, the device for avoiding interference may be configured separately from the central processing unit 401, for example, the device for avoiding interference may be configured as a chip connected to the central processing unit 401, and the function of the device for avoiding interference is realized by the control of the central processing unit 401.
As shown in fig. 4, the HUB400 may further include: a communication module 403 and a power supply 404. It is noted that HUB400 also does not necessarily include all of the components shown in fig. 4; furthermore, HUB400 may also include components not shown in fig. 4, as may be found in the prior art.
As shown in FIG. 4, a central processor 401, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, the central processor 401 receiving input and controlling operation of the various components of the HUB 400.
The memory 402 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. Any data may be stored and programs that execute the relevant information may also be stored. And the central processor 401 can execute the program stored in the memory 402 to realize information storage or processing, or the like. The functions of other parts are similar to the prior art and are not described in detail here. The components of HUB400 may be implemented in dedicated hardware, firmware, software, or combinations thereof, without departing from the scope of the invention.
Through the HUB of this embodiment, can predict the channel conflict through the relevant frequency hopping information that obtains adjacent network, can reduce conflict probability, avoid disturbing, not only be applicable to and take the beacon and do not take the access mode of beacon, need not change superframe cycle or beacon cycle moreover, have scalability.
Example 3
The embodiment provides a method for avoiding interference, which is applied to a HUB in a wireless body area network, and since the principle of solving the problem of the method is similar to that of the apparatus in embodiment 1, the specific implementation of the method can refer to the implementation of the apparatus in embodiment 1, and the description of the same contents is not repeated.
Fig. 5 is a flowchart of the method of the present embodiment, please refer to fig. 5, which includes:
step 501: the HUB acquires BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of an adjacent WBAN;
step 502: the HUB determines whether to avoid collision according to the BAN priority and/or the channel hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;
step 503: and if collision avoidance is carried out, the HUB carries out collision avoidance according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN.
In step 501, the HUB may obtain the BAN ID, HUB ID, BAN priority, hop period, time information for time alignment, and hop information for calculating a hop sequence of the neighboring WBAN from the received beacon or T-Poll from the neighboring WBAN.
In step 502, the HUB may compare the BAN priority of the WBAN to which it belongs with the BAN priorities of the neighboring WBANs, and determine not to perform collision avoidance when the BAN priority of the WBAN to which the HUB belongs is greater than the BAN priorities of the neighboring WBANs; when the BAN priority of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, determining to perform collision avoidance; comparing the hop period of the WBAN to which the HUB belongs to the hop period of the neighboring WBAN when the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the neighboring WBAN; when the frequency hopping period of the WBAN to which the HUB belongs is larger than that of the adjacent WBAN, determining not to perform collision avoidance; when the frequency hopping period of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, collision avoidance is determined; when the frequency hopping period of the WBAN to which the HUB belongs is equal to that of the adjacent WBAN, negotiating with the HUB of the adjacent WBAN to determine whether to avoid collision.
In step 503, the HUB may clock align the WBAN to which the HUB belongs with the neighboring WBAN; comparing the channel number in each frequency hopping period of the WBAN to which the HUB belongs with the channel number in the frequency hopping period of the adjacent WBAN corresponding to the frequency hopping period to determine the channel number with conflict; and changing the conflicting channel numbers to be different from the channel numbers of the hop periods of the neighboring WBANs.
Wherein, ifThe HUB associates the channel number in the mth hop period in the adjacent WBAN with the nth, n +1, n +2, …,the channel numbers within a hop period are compared to determine which channel numbers are in conflict.
Wherein, ifThe HUB will be adjacent toThe channel number in the mth hop period in the WBAN is compared with the channel numbers in the nth, n +1, n +2, …,the channel numbers within a hop period are compared to determine which channel numbers are in conflict.
Wherein, T2Is the length of the frequency hopping period, T, of the WBAN to which the HUB belongs1The length of the frequency hopping period, or T, for the adjacent WBAN2Is the length of the frequency hopping period, T, of the adjacent WBAN1Length of frequency hopping period for WBAN to which the HUB belongs, and T1>T2The time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period is 0 ≦ T2。
In this embodiment, the frequency hopping information may include: a random seed of channel hopping and information related to calculating a channel hopping sequence to calculate a hopping sequence; the time information may include: the start time of the channel hopping period for clock alignment.
In this embodiment, the HUB may further send a channel hopping message to the node in the WBAN to which the HUB belongs, and notify the node of the channel number of the next hopping period, so that the node changes to the channel corresponding to the channel number when performing frequency hopping.
In this embodiment, the HUB may also periodically broadcast a T-Poll frame or a beacon frame, where the T-Poll frame or the beacon frame includes a BAN ID, a HUB ID, a BAN priority, a frequency hopping period, time information for performing time alignment, and frequency hopping information for calculating a frequency hopping sequence of a WBAN to which the HUB belongs.
Fig. 6 is an overall flowchart of the method of the present embodiment, please refer to fig. 6, which includes:
step 601: two adjacent HUBs acquire the BAN ID, HUB ID, BAN priority, frequency hopping period, time information and other frequency hopping information of the WBAN of the other party;
step 602: determining whether the priority of the WBAN1 is equal to the priority of the WBAN 2; if not, executing step 603, otherwise, executing step 604;
step 603: the HUB with the lower BAN priority actively avoids the conflict;
step 604: determining whether the frequency hopping period of the WBAN1 is equal to the priority of the WBAN 2; if not, executing step 605, otherwise executing step 606;
step 605: the HUB with the small WBAN frequency hopping period actively avoids the conflict;
step 606: negotiating and deciding between adjacent HUBs to actively avoid conflicting HUBs;
step 607: the HUB actively avoiding the conflict aligns the starting time of the frequency hopping period according to the frequency hopping information and the time information of the WBAN and the frequency hopping information and the time information of the adjacent WBAN, calculates the frequency hopping sequence, compares the channel numbers of the corresponding frequency hopping periods, predicts the channel generating the conflict in the future, and then changes the frequency hopping channel, thereby avoiding the conflict.
Step 608: the HUB sends a frequency hopping message to the nodes in the WBAN to which the HUB belongs, and informs the nodes of the channel number of the next frequency hopping period.
The specific processing procedure has been described in detail in embodiment 1, and the contents thereof are incorporated herein and will not be described again.
The method of the embodiment can reduce the collision probability and avoid interference by predicting the channel collision by obtaining the relevant frequency hopping information of the adjacent network, is not only suitable for the access modes with beacons and without beacons, but also does not need to change the superframe period or the beacon period, and has expandability.
Example 4
This embodiment provides a wireless body area network system, which includes: HUB, and node.
In one embodiment, the HUB may be the HUB described in embodiment 2, and may include the apparatus described in embodiment 1 for implementing the method described in embodiment 3, and the contents of embodiments 1-3 are incorporated herein, and the description thereof is omitted.
Through the wireless body area network system of this embodiment, this HUB can reduce conflict probability through the relevant frequency hopping information prediction channel conflict that obtains adjacent network, avoids disturbing, not only is applicable to the access mode who takes the beacon and does not take the beacon, need not change superframe cycle or beacon cycle moreover, has scalability.
An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in an information processing apparatus or a HUB, the program causes a computer to execute the method of avoiding interference described in embodiment 3 in the information processing apparatus or the HUB.
An embodiment of the present invention also provides a storage medium storing a computer-readable program, where the computer-readable program enables a computer to execute the method for avoiding interference described in embodiment 3 in an information processing apparatus or a HUB.
The above devices and methods of the present invention can be implemented by hardware, or can be implemented by hardware and software. The present invention relates to a computer-readable program which, when executed by a logic section, enables the logic section to realize the above-described apparatus or constituent section, or to realize the above-described various methods or steps. The present invention also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like, for storing the above program.
While the invention has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are illustrative and not intended to limit the scope of the invention. Various modifications and alterations of this invention will become apparent to those skilled in the art based upon the spirit and principles of this invention, and such modifications and alterations are also within the scope of this invention.
With respect to the embodiments including the above embodiments, the following remarks are also disclosed:
supplementary note 1, an apparatus for avoiding interference, applied to a HUB (HUB) in a Wireless Body Area Network (WBAN), wherein the apparatus comprises:
an acquisition unit that acquires a BAN ID, a HUB ID, a BAN priority, a hop period, time information for time alignment, and hop information for calculating a hop sequence of an adjacent WBAN;
a determining unit, which determines whether to avoid collision according to the BAN priority and/or the channel hopping cycle of the WBAN to which the HUB belongs and the adjacent WBAN;
and the processing unit is used for avoiding collision according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN when the HUB carries out collision avoidance.
Supplementary note 2, the apparatus according to supplementary note 1, wherein the apparatus further comprises:
a receiving unit, which receives a beacon or a T-Poll frame transmitted by a HUB of the neighboring WBAN;
the acquiring unit acquires the BAN ID, hub, BAN priority, hop period, time information for time alignment, and hop information for calculating a hop sequence of the neighboring WBAN from the beacon or the T-Poll frame.
Note 3 of the present invention, the apparatus according to note 1, wherein the determination unit includes:
a first comparison module that compares the BAN priority of the WBAN to which the HUB belongs to the BAN priority of the neighboring WBAN;
a first determining module, configured to determine not to perform collision avoidance when the BAN priority of the WBAN to which the HUB belongs is greater than the BAN priority of the neighboring WBAN; when the BAN priority of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, determining to perform collision avoidance;
a second comparing module for comparing the hop period of the WBAN to which the HUB belongs with the hop period of the neighboring WBAN when the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the neighboring WBAN;
a second determining module, configured to determine not to perform collision avoidance when the frequency hopping cycle of the WBAN to which the HUB belongs is greater than the frequency hopping cycle of the adjacent WBAN; when the frequency hopping period of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, collision avoidance is determined;
a negotiation module, configured to negotiate with the HUB of the adjacent WBAN when the frequency hopping period of the WBAN to which the HUB belongs is equal to the frequency hopping period of the adjacent WBAN, so as to determine whether to perform collision avoidance.
Supplementary note 4, the apparatus according to supplementary note 1, wherein the processing unit includes:
an alignment module, configured to perform clock alignment on the WBAN to which the HUB belongs and the adjacent WBAN according to the time information of the WBAN to which the HUB belongs and the time information of the adjacent WBAN;
a third comparing module, configured to compare the channel number in each frequency hopping period of the WBAN to which the HUB belongs with the channel number in the frequency hopping period of the adjacent WBAN corresponding to the frequency hopping period, and determine that there is a conflicting channel number;
a processing module that changes the conflicting channel numbers to be different from the channel numbers of the frequency hopping periods of the neighboring WBANs.
Supplementary note 5, an apparatus according to supplementary note 4, wherein,
the third comparing module is arrangedThen, the m-th hop in the adjacent WBAN is startedThe channel number in the frequency cycle is compared with the channel numbers of the nth, n +1, n +2, … in the WBAN to which the HUB belongs,comparing channel numbers in each frequency hopping period to determine the channel numbers with conflict;
the third comparing module is arrangedThen, the channel number in the mth hop period in the adjacent WBAN is compared with the channel numbers in the nth, n +1, n +2, … in the WBAN to which the HUB belongs,comparing channel numbers in each frequency hopping period to determine the channel numbers with conflict;
wherein, T2Is the length of the frequency hopping period, T, of the WBAN to which the HUB belongs1The length of the frequency hopping period, or T, for the adjacent WBAN2Is the length of the frequency hopping period, T, of the adjacent WBAN1Length of frequency hopping period for WBAN to which the HUB belongs, and T1>T2The time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period is 0 ≦ T2。
Supplementary note 6, the apparatus according to supplementary note 1, wherein the apparatus further comprises:
and the sending unit is used for sending a channel frequency hopping message to the nodes in the WBAN to which the HUB belongs and telling the nodes the channel number of the next frequency hopping period, so that the nodes can change to the channel corresponding to the channel number when carrying out frequency hopping.
Supplementary note 7, the apparatus according to supplementary note 1, wherein the apparatus further comprises:
the broadcast unit periodically broadcasts T-Poll frames or beacon frames, wherein the T-Poll frames or beacon frames comprise BAN IDs, HUB IDs, BAN priorities, frequency hopping periods, time information for time alignment and frequency hopping information for calculating frequency hopping sequences of WBANs to which the HUBs belong.
Supplementary note 8, an apparatus according to supplementary note 1, wherein,
the frequency hopping information includes: random seed of channel hopping and information related to calculating a channel hopping sequence;
the time information includes: the start time of the channel hopping period.
Annex 9, a HUB in a wireless body area network, wherein the HUB (HUB) is configured to:
acquiring BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of adjacent WBAN;
determining whether to avoid collision according to the BAN priority and/or the channel hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;
and if collision avoidance is carried out, collision avoidance is carried out according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN.
Supplementary note 10, a method for avoiding interference, applied to a HUB (HUB) in a Wireless Body Area Network (WBAN), wherein the method comprises:
the HUB acquires BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of an adjacent WBAN;
the HUB determines whether to avoid collision according to the BAN priority and/or the channel hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;
and if collision avoidance is carried out, the HUB carries out collision avoidance according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN.
Supplementary note 11 and the method according to supplementary note 10, wherein,
the HUB acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment, and frequency hopping information for calculating a frequency hopping sequence of the neighboring WBAN from the received beacon or T-Poll from the neighboring WBAN.
Supplementary note 12, the method according to supplementary note 10, wherein the HUB determining whether to perform collision avoidance comprises:
the HUB comparing the BAN priority of the WBAN to which it belongs to the BAN priorities of the neighboring WBANs;
if the BAN priority of the WBAN to which the HUB belongs is larger than that of the adjacent WBAN, determining not to perform collision avoidance;
if the BAN priority of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, determining to avoid collision;
if the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the neighboring WBAN, the HUB compares the hop period of the WBAN to which it belongs with the hop period of the neighboring WBAN;
if the frequency hopping period of the WBAN to which the HUB belongs is larger than that of the adjacent WBAN, determining not to perform collision avoidance;
if the frequency hopping period of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, determining to avoid collision;
and if the frequency hopping period of the WBAN to which the HUB belongs is equal to that of the adjacent WBAN, the HUB negotiates with the HUB of the adjacent WBAN to determine whether collision avoidance is performed.
Supplementary note 13, the method according to supplementary note 1, wherein the HUB performs collision avoidance, comprising:
clock aligning the WBAN to which the HUB belongs and the adjacent WBAN;
comparing the channel number in each frequency hopping period of the WBAN to which the HUB belongs with the channel number in the frequency hopping period of the adjacent WBAN corresponding to the frequency hopping period, and determining that the channel number with conflict exists;
changing the conflicting channel numbers to be different from the channel numbers of the frequency hopping periods of the neighboring WBANs.
Reference numeral 14, a method according to reference numeral 13, wherein,
if it is notThe channel number in the mth hop period in the adjacent WBAN is compared with the channel numbers in the nth, n +1, n +2, …,comparing channel numbers in each frequency hopping period to determine the channel numbers with conflict;
if it is notThe channel number in the mth hop period in the adjacent WBAN is compared with the channel numbers in the nth, n +1, n +2, …,comparing channel numbers in each frequency hopping period to determine the channel numbers with conflict;
wherein, T2Is the length of the frequency hopping period, T, of the WBAN to which the HUB belongs1The length of the frequency hopping period, or T, for the adjacent WBAN2Is the length of the frequency hopping period, T, of the adjacent WBAN1Length of frequency hopping period for WBAN to which the HUB belongs, and T1>T2A time difference between the start time of the mth hop period and the start time of the nth hop period,and T is more than or equal to 02。
Supplementary note 15, the method according to supplementary note 10, wherein the method further comprises:
and the HUB sends a channel frequency hopping message to the node in the WBAN to which the HUB belongs, and tells the node the channel number of the next frequency hopping period, so that the node is changed to the channel corresponding to the channel number when frequency hopping is carried out.
Supplementary note 16, the method according to supplementary note 10, wherein the method further comprises:
the HUB periodically broadcasts T-Poll frames or beacon frames, wherein the T-Poll frames or beacon frames comprise BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of the WBAN to which the HUB belongs.
Reference numeral 17, a method according to reference numeral 10, wherein,
the frequency hopping information includes: random seed of channel hopping and information related to calculating a channel hopping sequence;
the time information includes: the start time of the channel hopping period.

Claims (10)

1. An apparatus for avoiding interference, applied to a HUB (HUB) in a Wireless Body Area Network (WBAN), wherein the apparatus comprises:
an acquisition unit that acquires a BAN ID, a HUB ID, a BAN priority, a hop period, time information for time alignment, and hop information for calculating a hop sequence of an adjacent WBAN;
a determining unit, which determines whether to avoid collision according to the BAN priority and/or the channel hopping cycle of the WBAN to which the HUB belongs and the adjacent WBAN;
and the processing unit is used for avoiding collision according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN when the HUB carries out collision avoidance.
2. The apparatus of claim 1, wherein the apparatus further comprises:
a receiving unit, which receives a beacon or a T-Poll frame transmitted by a HUB of the neighboring WBAN;
the acquiring unit acquires the BAN ID, hub, BAN priority, hop period, time information for time alignment, and hop information for calculating a hop sequence of the neighboring WBAN from the beacon or the T-Poll frame.
3. The apparatus of claim 1, wherein the determining unit comprises:
a first comparison module that compares the BAN priority of the WBAN to which the HUB belongs to the BAN priority of the neighboring WBAN;
a first determining module, configured to determine not to perform collision avoidance when the BAN priority of the WBAN to which the HUB belongs is greater than the BAN priority of the neighboring WBAN; when the BAN priority of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, determining to perform collision avoidance;
a second comparing module for comparing the hop period of the WBAN to which the HUB belongs with the hop period of the neighboring WBAN when the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the neighboring WBAN;
a second determining module, configured to determine not to perform collision avoidance when the frequency hopping cycle of the WBAN to which the HUB belongs is greater than the frequency hopping cycle of the adjacent WBAN; when the frequency hopping period of the WBAN to which the HUB belongs is smaller than that of the adjacent WBAN, collision avoidance is determined;
a negotiation module, configured to negotiate with the HUB of the adjacent WBAN when the frequency hopping period of the WBAN to which the HUB belongs is equal to the frequency hopping period of the adjacent WBAN, so as to determine whether to perform collision avoidance.
4. The apparatus of claim 1, wherein the processing unit comprises:
an alignment module, configured to perform clock alignment on the WBAN to which the HUB belongs and the adjacent WBAN according to the time information of the WBAN to which the HUB belongs and the time information of the adjacent WBAN;
a third comparing module, configured to compare the channel number in each frequency hopping period of the WBAN to which the HUB belongs with the channel number in the frequency hopping period of the adjacent WBAN corresponding to the frequency hopping period, and determine that there is a conflicting channel number;
a processing module that changes the conflicting channel numbers to be different from the channel numbers of the frequency hopping periods of the neighboring WBANs.
5. The apparatus of claim 4, wherein,
the third comparing module is arrangedThen, the channel number in the mth hop period in the adjacent WBAN is compared with the channel numbers in the nth, n +1, n +2, … in the WBAN to which the HUB belongs,comparing channel numbers in each frequency hopping period to determine the channel numbers with conflict;
the third comparing module is arrangedThen, the channel number in the mth hop period in the adjacent WBAN is compared with the channel numbers in the nth, n +1, n +2, … in the WBAN to which the HUB belongs,comparing channel numbers in each frequency hopping period to determine the channel numbers with conflict;
wherein, T2Frequency hopping period for WBAN to which the HUB belongsLength of (1), T1The length of the frequency hopping period, or T, for the adjacent WBAN2Is the length of the frequency hopping period, T, of the adjacent WBAN1Length of frequency hopping period for WBAN to which the HUB belongs, and T1>T2The time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period is 0 ≦ T2。
6. The apparatus of claim 1, wherein the apparatus further comprises:
and the sending unit is used for sending a channel frequency hopping message to the nodes in the WBAN to which the HUB belongs and telling the nodes the channel number of the next frequency hopping period, so that the nodes can change to the channel corresponding to the channel number when carrying out frequency hopping.
7. The apparatus of claim 1, wherein the apparatus further comprises:
the broadcast unit periodically broadcasts T-Poll frames or beacon frames, wherein the T-Poll frames or beacon frames comprise BAN IDs, HUB IDs, BAN priorities, frequency hopping periods, time information for time alignment and frequency hopping information for calculating frequency hopping sequences of WBANs to which the HUBs belong.
8. The apparatus of claim 1, wherein,
the frequency hopping information includes: random seed of channel hopping and information related to calculating a channel hopping sequence;
the time information includes: the start time of the channel hopping period.
9. A HUB in a wireless body area network, wherein the HUB (HUB) is configured to:
acquiring BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of adjacent WBAN;
determining whether to avoid collision according to the BAN priority and/or the channel hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;
and if collision avoidance is carried out, collision avoidance is carried out according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN.
10. A method of avoiding interference, applied to a HUB (HUB) in a Wireless Body Area Network (WBAN), wherein the method comprises:
the HUB acquires BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating a frequency hopping sequence of an adjacent WBAN;
the HUB determines whether to avoid collision according to the BAN priority and/or the channel hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;
and if collision avoidance is carried out, the HUB carries out collision avoidance according to the frequency hopping information and the time information of the WBAN to which the HUB belongs and the frequency hopping information and the time information of the adjacent WBAN.
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