CN106332292A - Device, method and system for avoiding interference applied to wireless body area network - Google Patents

Abstract

Embodiments of the present invention provide a device, method and system for avoiding interference applied to a wireless body area network. The device is applied to a hub (HUB) in a wireless body area network (WBAN), wherein the device includes: An acquisition unit, which acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information used to calculate the frequency hopping sequence of the adjacent WBAN; the determination unit, according to the The BAN priority and/or channel frequency hopping cycle of the WBAN to which the HUB belongs and the adjacent WBAN determines whether to perform conflict avoidance; the processing unit, when the HUB performs conflict avoidance, according to the frequency hopping information of the WBAN to which the HUB belongs Collision avoidance is performed with the time information and the frequency hopping information and time information of the adjacent WBAN. Through this embodiment, the probability of channel collision can be reduced, thereby better avoiding interference between two adjacent or overlapping WBANs.

Description

Device, method and system for avoiding interference applied to wireless body area network

technical field

The present invention relates to the field of communication technology, in particular to an interference avoiding device, method and system applied to a Wireless Body Area Network (WBAN, Wireless Body Area Network).

Background technique

IEEE 802.15.6 is a standard applied to wireless body area networks. This standard aims to define a highly reliable, low power consumption, and scalable short-range wireless communication network. However, WBANs that are adjacent or have overlapping coverage areas can cause interference to neighboring networks.

Figure 1 shows two WBANs with overlapping coverage areas, namely WBAN1 and WBAN2. When the two WBANs work on the same channel, the nodes in the coverage area will be interfered by neighboring networks. For example, when HUB1 and HUB2 use the same channel, node 1 in WBAN1 may be interfered by HUB2 in WBAN2. Similarly, node 5 in WBAN2 will also receive interference from HUB1 in WBAN1.

In the IEEE 802.15.6 standard, three methods for solving the interference problem are proposed.

Method 1: Beacon displacement

In this method, the HUB needs to select a beacon shift sequence that is not used by the HUB of its adjacent WBAN to alleviate the potential duplicate beacons of adjacent or overlapping WBANs in the same channel Collision, and plan assignment conflicts. However, this method is only applicable to an access method with a beacon, and for an access method that does not use a beacon, this method cannot be used to solve the interference conflict problem.

Method 2: Superframe interleaving

In this method, two adjacent or overlapping HUBs negotiate to occupy the same channel independently within a certain period of time. This method allocates the same channel to different WBANs by dividing frequency resources in time, thereby avoiding conflicts and interferences. This approach may require changing the original superframe period (or beacon period) of the WBAN. Since this method uses the negotiation between HUBs, the same channel is fixedly assigned to different wireless body area networks. If a new wireless body area network is added, re-negotiation is required, and then the resources of the same channel are divided. Therefore, this approach lacks certain flexibility and scalability.

Method Three: Frequency Hopping

This method reduces the possibility of channel collisions by randomly jumping between different channels. Different WBANs use different random seeds to generate different frequency hopping sequences to avoid interference. However, this approach still has limitations. The limitations are explained below with examples.

In the scenario shown in FIG. 1 , for easy understanding, it is assumed that the frequency hopping periods of WBAN1 and WBAN2 are the same, and the start times of the frequency hopping periods are aligned. Here, the frequency hopping random seeds of WBAN1 and WBAN2 are 1010001000100011 and 0011000001111010 respectively, based on the 16-bit Galois linear feedback shift register (Galois linear feedback shift register, LFSR), the value of the k-th frequency hopping period can be calculated . Assuming that the frequency band 402-405 is used, according to 802.15.6, this frequency band is divided into 10 channels. Meanwhile, it is assumed that the minimum distance between two consecutive frequency hopping channels is 2. According to the frequency hopping sequence calculation formula in 802.15.6, the channel where WBAN1 and WBAN2 are located in the k-th frequency hopping period can be calculated Where i represents the serial number of the wireless body area network. Table 1 gives the 20 frequency hopping periods of WBAN1 and WBAN2 respectively

Table 1: Channels where WBAN1 and WBAN2 frequency hopping periods are located

It can be found from Table 1 that when k=2 and k=15, a collision will occur between WBAN1 and WBAN2. During these 20 frequency hopping periods, the probability of collision is 10%. Therefore, it can be seen that the frequency hopping method cannot completely avoid channel collision, and thus cannot completely avoid interference.

It should be noted that the above introduction of the technical background is only for the convenience of a clear and complete description of the technical solution of the present invention, and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are known to those skilled in the art just because these solutions are described in the background of the present invention.

Contents of the invention

Embodiments of the present invention provide an interference avoidance device, method and system applied to wireless body area networks, so as to avoid interference between two adjacent or overlapping wireless body area networks.

According to a first aspect of an embodiment of the present invention, a device for avoiding interference is provided, which is applied to a hub (HUB) in a wireless body area network (WBAN), wherein the device includes:

An acquisition unit, which acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating the frequency hopping sequence of the adjacent WBAN;

A determination unit, which determines whether to perform conflict avoidance according to the BAN priority and/or channel frequency hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;

The processing unit is configured to perform conflict 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 the HUB performs conflict avoidance.

According to a second aspect of an embodiment of the present invention, a hub in a wireless body area network is provided, wherein the hub (HUB) is configured to:

Obtain the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating the frequency hopping sequence of adjacent WBANs;

Determine whether to perform conflict avoidance according to the BAN priority and/or channel frequency hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;

If conflict avoidance is performed, conflict avoidance is performed 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.

According to a third aspect of an embodiment of the present invention, a method for avoiding interference is provided, which is applied to a hub (HUB) in a wireless body area network (WBAN), wherein the method includes:

The HUB acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating the frequency hopping sequence of the adjacent WBAN;

The HUB determines whether to perform conflict avoidance according to the BAN priority and/or channel frequency hopping period of the WBAN to which it belongs and the adjacent WBAN;

If conflict avoidance is performed, the HUB performs conflict avoidance according to the frequency hopping information and time information of the WBAN to which it belongs and the frequency hopping information and time information of the neighboring WBAN.

The beneficial effect of the present invention is that: through the device, method and system of this embodiment, the probability of channel collision can be reduced, thereby better avoiding interference between two adjacent or overlapping WBANs.

With reference to the following description and accompanying drawings, there are disclosed in detail specific embodiments of the invention, indicating the manner in which the principles of the invention may be employed. It should be understood that embodiments of the invention are not limited thereby in scope. Embodiments of the invention encompass many changes, modifications and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with, or instead of features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of a feature, integer, step or component, but does not exclude the presence or addition of one or more other features, integers, steps or components.

Description of drawings

The included drawings are used to provide further understanding of the embodiments of the present invention, and constitute a part of the specification, are used to illustrate the implementation mode of the present invention, and together with the text description, explain the principle of the present invention. Apparently, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings according to these drawings without any creative effort. In the attached picture:

Figure 1 is a schematic diagram of two adjacent wireless body area networks with overlapping coverage areas;

FIG. 2 is a schematic diagram of the composition of the device for avoiding interference in this embodiment;

3 is a schematic diagram of an example of clock alignment and channel number comparison;

FIG. 4 is a schematic diagram of the hardware composition of the HUB of the present embodiment;

FIG. 5 is a flow chart of the method for avoiding interference in this embodiment;

FIG. 6 is an overall flow chart of the method for avoiding interference in this embodiment.

detailed description

The foregoing and other features of the invention will become apparent from the following description, taken with reference to the accompanying drawings. In the specification and drawings, specific embodiments of the invention are disclosed, which illustrate some embodiments in which the principles of the invention may be employed. It is to be understood that the invention is not limited to the described embodiments, but rather, the invention The invention includes all modifications, variations and equivalents that come within the scope of the appended claims.

Example 1

This embodiment provides a device 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 composition of the device. As shown in FIG. 2 , the device 200 mainly includes: an acquisition unit 201 , a determination unit 202 and a processing unit 203 . in,

The acquiring unit 201 is configured to acquire the BAN ID, HUB ID, BAN priority, frequency hopping period, time information and frequency hopping information of adjacent WBANs.

The determining unit 202 is configured to determine whether to perform conflict avoidance according to the BAN priority and/or the frequency hopping period of the WBAN to which the HUB belongs and the adjacent WBAN.

The processing unit 203 is configured to perform conflict 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 neighboring WBAN when determining to perform conflict avoidance.

Through the device of this embodiment, the HUB decides whether to perform conflict avoidance according to the BAN priority and/or frequency hopping cycle of the WBAN it belongs to and the neighboring WBANs. The frequency hopping information and time information of the WBAN perform conflict avoidance, which can reduce the probability of channel collision, thereby better avoiding interference.

In this embodiment, the device may further include: a receiving unit 204, which receives a beacon frame or a T-Poll frame (Poll frame with a time stamp) sent by the HUB of the adjacent WBAN. The acquiring unit 201 acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information and frequency hopping information of the adjacent WBAN from the beacon frame or T-Poll frame received by the receiving unit 204 .

In this embodiment, the HUBs of each WBAN periodically broadcast beacon frames or T-Poll frames, and the beacon frames or T-Poll frames contain the BAN ID, HUB ID, BAN priority, frequency hopping period, time information and frequency hopping information. The obtaining unit 201 of this embodiment can obtain the above information of the adjacent WBAN according to the above beacon frame or T-Poll frame sent by the HUB of the adjacent WBAN received by the receiving unit 204 .

Wherein, the above-mentioned time information is used for time alignment, and the above-mentioned frequency hopping information is used for calculating the frequency hopping sequence, but this embodiment is not limited by this. In the specific implementation process, the time information and the frequency hopping information can also be used for other purposes. Wherein, the time information may be the start time of the frequency hopping period, and the frequency hopping information may include a random seed of the frequency hopping, and may further include other information related to calculating the frequency hopping sequence.

In this embodiment, the determination unit 202 may determine whether the HUB performs conflict avoidance or the HUB of the adjacent WBAN performs conflict avoidance according to the BAN priority of the two WBANs and/or the size of the frequency hopping period, For example, the HUB with a low BAN priority or a small frequency hopping period can perform conflict avoidance. If the BAN priority and frequency hopping period are equal, it can be determined through negotiation who will perform conflict avoidance.

In one embodiment, as shown in FIG. 2, the determination 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 comparison module 2021 is configured to compare the BAN priority of the WBAN to which the HUB belongs with the BAN priority of the adjacent WBAN.

The first determining module 2022 is used to determine not to perform conflict avoidance when the BAN priority of the WBAN to which the HUB belongs is greater than the BAN priority of the adjacent WBAN; When the BAN priority of the adjacent WBAN is determined, conflict avoidance is performed. That is, HUBs with lower priorities perform conflict avoidance.

The second comparison module 2023 is used to compare the frequency hopping period of the WBAN to which the HUB belongs with the frequency hopping period of the adjacent WBAN when the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the adjacent WBAN. Cycles are compared. Wherein, since the BANs have the same priority, the HUB for collision avoidance can be determined by comparing the frequency hopping period.

The second determining module 2024 is used to determine not to perform conflict 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; When the frequency hopping period of the adjacent WBAN is determined, conflict avoidance is performed. That is, the HUB with the smaller frequency hopping period performs collision avoidance.

The negotiation module 2025 is configured to negotiate with the HUB of the adjacent WBAN to determine whether to perform conflict avoidance when the frequency hopping period of the WBAN to which the HUB belongs is equal to the frequency hopping period of the adjacent WBAN. Wherein, since the BAN priority and frequency hopping period are the same, the two HUBs can decide who will avoid the conflict through negotiation, and the negotiation method and strategy are not limited in this embodiment.

In this embodiment, when the determination unit 202 determines that the HUB performs conflict avoidance, the processing unit 203 can perform collision 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). avoid.

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 alignment 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 comparison module 2032 is used 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 There are conflicting channel numbers.

The processing module 2033 is configured to change the conflicting channel number to be different from the channel number of the frequency hopping period of the adjacent WBAN.

In this embodiment, the alignment module 2031 aligns the clocks of the two WBANs for the convenience of channel number comparison, so as to accurately determine whether there is a conflict between the two WBANs. In one embodiment, the alignment module 2031 first calculates the time difference between the two WBANs, and then performs clock alignment according to the time difference.

The following example provides a method for the alignment module 2031 to calculate the time difference between different WBANs, but this embodiment is not limited thereto.

In this example, HUB1 and HUB2 send test frames to each other, assuming that the time when HUB1 sends the test frame to HUB2 is recorded as t ₀₁ in HUB1, and the time when HUB2 receives the test frame is recorded as t ₀₂ in HUB2. Assume that the time when HUB2 sends the test frame to HUB1 is recorded as t ₀₂ ' in HUB2, and the time when HUB1 receives the test frame is recorded in HUB1 as t ₀₁ '. It is assumed that the transmission time of the test frame sent from HUB1 to HUB2 and the test frame sent from HUB2 to HUB1 are the same, and the time t _p of the test frame transmitted between HUB1 and HUB2 is unknown. Let Δt denote the time difference between WBAN1 and WBAN2. t ₀₁ , t ₀₂ , t ₀₁ ' and t ₀₂ ' can be exchanged between adjacent HUBs. Then the relationship between the above times is described as shown in formula (1) and formula (2).

t ₀₁ +Δt+t _p =t ₀₂ (1)

t ₀₂ '-Δt+t _p =t ₀₁ ' (2)

Therefore, the alignment module 2031 can calculate the time difference Δt between the two WBANs through the above formula. If Δt>0, it means that the clock of HUB1 is slower than the clock of HUB2; otherwise, it means that the clock of HUB1 is faster than the clock of HUB2. By calculating the time difference, the alignment module 2031 can perform clock alignment on the two WBANs according to the time difference.

Figure 3 is a schematic diagram of aligning the start times of the frequency hopping periods of the two WBANs. As shown in Figure 3, it is assumed that the BAN priority of WBAN1 is higher than that of WBAN2, and T ₁ >T ₂ , where T ₁ and T ₂ represent The frequency hopping period of WBAN1 and WBAN2, therefore, HUB2 needs to actively avoid conflicts. In this example, HUB2 has obtained the start time t ₁ of a frequency hopping period of HUB1, and the alignment module 2031 of HUB2 calculates the value t ₂ of t ₁ under its own clock according to the time difference Δt, as shown in FIG. 3 . This means that t ₂ is aligned with the start time of T ₁ . This example is for the case of T ₁ >T ₂ , and the method is similar when T ₁ ≤ T ₂ .

In this embodiment, after the alignment module 2031 aligns the clocks of the two WBANs, the third comparison module 2032 can compare the channel numbers of the two WBANs. In one embodiment, the third comparison module 2032 can determine whether there is a conflicting channel number according to the channel usage conditions of the two WBANs in the same time period, for example, the third comparison module 2032 can set The channel number of WBAN2 is compared with the channel number in the frequency hopping period of WBAN1 corresponding to each frequency hopping period of WBAN2, so as to determine the conflicting channel number.

where, if Then the third comparison module 2032 can compare the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers.

where, if Then the third comparison module 2032 can compare the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers.

Wherein, T ₂ is the length of the frequency hopping period of the WBAN to which the HUB belongs, T ₁ is the length of the frequency hopping period of the adjacent WBAN, or T ₂ is the length of the frequency hopping period of the adjacent WBAN, T ₁ is the length of the frequency hopping period of the WBAN to which the HUB belongs, and T ₁ >T ₂ , ε is the time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period, and 0≤ε<T ₂ .

Still taking the example shown in Figure 3, set the time difference between t ₂ and the start time of T ₂ under the clock of HUB2 as ε, and 0≤ε<T ₂ , m is the jump of WBAN1 with t ₁ as the start time The number of the frequency cycle, n is the number of the frequency hopping cycle where t ₂ is located in WBAN2, as shown in Figure 3. if Then the third comparison module 2032 compares the channel number (denoted as Ch ₁ (m)) of the mth frequency hopping period in WBAN1 with the n, n+1, n+2,..., The channel number (denoted as Ch ₂ (j)) within a frequency hopping period is compared; if Then the third comparison module 2032 compares the channel number (denoted as Ch ₁ (m)) of the m-th frequency hopping period in WBAN1 with the n, n+1, n+2,... The channel number (denoted as Ch ₂ (j)) within a frequency hopping period is compared. Wherein, WBAN1 is the adjacent WBAN, and WBAN2 is the WBAN to which the HUB belongs.

According to the above rules, the third comparison module 2032 compares the channel numbers of the mth frequency hopping period of WBAN1 with the channel numbers of the n, n+1, n+2 and n+3 frequency hopping periods of WBAN2, if the If the channel number of the mth frequency hopping period of WBAN1 is the same as the channel number of the nth, n+1, n+2 or n+3 frequency hopping period of WBAN2, it is considered that there is a conflict, and thus it can be determined that there is a conflict channel number.

According to the above rules, the third comparison module 2032 compares the channel number of the m+1 frequency hopping period of WBAN1 with the n+3, n+4, n+5, n+6 and n+7 frequency hopping periods of WBAN2 If the channel number of the m+1th frequency hopping period of the WBAN1 is compared with the channel number of the n+3, n+4, n+5, n+6 or n+7th frequency hopping period of the WBAN2 If the channel numbers are the same, it is considered that there is a conflict, and thus the conflicting channel number can be determined.

In this embodiment, the processing module 2033 can make the channel number of the frequency hopping period of the WBAN to which the HUB belongs to be different from that of the adjacent WBAN by changing the above-mentioned conflicting channel number.

Still taking Figure 3 as an example, since the BAN priority of WBAN2 is less than the BAN priority of WBAN1, HUB2 performs conflict avoidance, then the HUB2 can change Ch ₂ (j) through the processing module 2033 to make it different from Ch ₁ (m) , Ch ₂ (j-1) and Ch ₂ (j+1), and ensure that the difference between two consecutive frequency hopping channel numbers is greater than or equal to a certain minimum interval, where Ch ₂ (j) refers to all The channel that conflicts with the mth channel (ie Ch ₁ (m)) in WBAN1. On the contrary, if the BAN priority of WBAN2 is greater than the BAN priority of WBAN1, HUB1 will perform conflict avoidance, then the HUB1 can change Ch ₁ (m) through the processing module 2033 to make it different from Ch ₂ '(j), Ch ₁ (m-1) and Ch ₁ (m+1), and ensure that the difference between the channel numbers of two consecutive frequency hopping is greater than or equal to a certain minimum interval, where Ch ₂ '(j) means that in WBAN2 and WBAN1 All channels corresponding to the mth channel (that is, Ch ₁ (m)). Thus, the probability of collision is reduced and interference is avoided.

In an implementation of this embodiment, as shown in FIG. 2, the device 200 may further include a sending unit 204, which sends a channel frequency hopping message to the nodes in the WBAN to which the HUB belongs, telling the nodes to hop next The channel number of the frequency cycle, so that the node changes to the channel corresponding to the channel number when performing frequency hopping. In this embodiment, in the frequency hopping period before changing the channel, the HUB can notify the nodes in the WBAN to which it belongs to change the channel to another new channel in the next frequency hopping period.

In an implementation of this embodiment, as shown in FIG. 2, the apparatus 200 may further include a broadcast unit 205, which periodically broadcasts a T-Poll frame or a beacon frame, and the T-Poll frame or the beacon frame contains the BAN ID of the WBAN to which the HUB belongs, the HUB ID, the BAN priority, the frequency hopping period, the time information used for time alignment, and the frequency hopping information used for calculating the frequency hopping sequence. In this embodiment, as mentioned above, the two HUBs exchange the above information by broadcasting beacon frames or T-Poll frames. Wherein, this embodiment does not limit the manner of broadcasting the beacon frame or the T-Poll frame.

The device for avoiding interference in this embodiment predicts channel conflicts by obtaining relevant frequency hopping information of adjacent networks, which can reduce the probability of collisions and avoid interference. The superframe period or beacon period can be changed, which is scalable.

Example 2

This embodiment provides a HUB in a wireless body area network, where the HUB includes the device for avoiding interference as described in Embodiment 1.

Fig. 4 is a schematic block diagram of the system configuration of the HUB 400 according to the embodiment of the present invention. As shown in FIG. 4 , the HUB 400 may include a central processing unit 401 and a memory 402 ; the memory 402 is coupled to the central processing unit 404 . It is worth noting that this figure is exemplary; other types of structures may also be used in addition to or instead of this structure to implement telecommunications functions or other functions.

In one embodiment, the function of the device for avoiding interference can be integrated into the central processing unit 401 .

In another embodiment, the device for avoiding interference can be configured separately from the central processing unit 401, for example, the device for avoiding interference can be configured as a chip connected to the central processing unit 401, and the control of the central processing unit 401 is used to realize the Avoid interfering with the functionality of the device.

As shown in FIG. 4 , the HUB 400 may further include: a communication module 403 and a power supply 404 . It should be noted that the HUB 400 does not necessarily include all the components shown in FIG. 4; in addition, the HUB 400 may also include components not shown in FIG. 4, and reference may be made to the prior art.

As shown in FIG. 4 , the central processing unit 401 is sometimes also called a controller or operating control, and may include a microprocessor or other processor devices and/or logic devices. The central processing unit 401 receives input and controls various components of the HUB 400 operation.

Wherein, the memory 402 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory, or other suitable devices. Any data can be stored, and programs to execute related information can also be stored. And the central processing unit 401 can execute the program stored in the memory 402 to implement information storage or processing. The functions of other components are similar to those in the prior art, and will not be repeated here. Each component of HUB 400 may be implemented by dedicated hardware, firmware, software or a combination thereof without departing from the scope of the present invention.

Through the HUB of this embodiment, the channel conflict can be predicted by obtaining the relevant frequency hopping information of the adjacent network, which can reduce the probability of collision and avoid interference. The frame period or beacon period can be changed, which is scalable.

Example 3

This embodiment provides a method for avoiding interference, which is applied to the HUB in the wireless body area network. Since the problem-solving principle of this method is similar to that of the device in Embodiment 1, its specific implementation can refer to Embodiment 1. The implementation of the device, the same content will not be repeated.

Fig. 5 is a flowchart of the method of this embodiment, please refer to Fig. 5, the method includes:

Step 501: The HUB acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating the frequency hopping sequence of the adjacent WBAN;

Step 502: The HUB determines whether to perform conflict avoidance according to the BAN priority and/or channel frequency hopping period of the WBAN to which it belongs and the adjacent WBAN;

Step 503: If conflict avoidance is performed, the HUB performs conflict avoidance according to the frequency hopping information and time information of the WBAN it belongs to and the frequency hopping information and time information of the neighboring WBAN.

In step 501, the HUB can obtain the BAN ID, HUB ID, BAN priority, frequency hopping period, and time for the adjacent WBAN from the received beacon or T-Poll of the adjacent WBAN. Aligned time information and frequency hopping information used to calculate the frequency hopping sequence.

In step 502, the HUB can compare the BAN priority of the WBAN to which it belongs with the BAN priority of the adjacent WBAN, and the BAN priority of the WBAN to which the HUB belongs is greater than the BAN of the adjacent WBAN priority, determine not to avoid conflicts; when the BAN priority of the WBAN to which the HUB belongs is less than the BAN priority of the adjacent WBAN, determine to avoid conflicts; when the BAN priority of the WBAN to which the HUB belongs is equal to For the BAN priority of the adjacent WBAN, compare the frequency hopping period of the WBAN to which the HUB belongs with the frequency hopping period of the adjacent WBAN; if the frequency hopping period of the WBAN to which the HUB belongs is greater than the When the frequency hopping period of the adjacent WBAN, it is determined not to perform conflict avoidance; when the frequency hopping period of the WBAN to which the HUB belongs is less than the frequency hopping period of the adjacent WBAN, it is determined to perform conflict avoidance; When the frequency hopping period is equal to the frequency hopping period of the adjacent WBAN, negotiate with the HUB of the adjacent WBAN to determine whether to perform conflict avoidance.

In step 503, the HUB can perform clock alignment on the WBAN to which the HUB belongs and the neighboring WBAN; Compare the channel number in the frequency hopping period of the adjacent WBAN corresponding to the frequency hopping period "to determine the conflicting channel number; and change the conflicting channel number so that it is different from the channel number of the adjacent WBAN The channel number of the frequency cycle is different.

where, if Then the HUB compares the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers.

where, if Then the HUB compares the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers.

Wherein, T ₂ is the length of the frequency hopping period of the WBAN to which the HUB belongs, T ₁ is the length of the frequency hopping period of the adjacent WBAN, or T ₂ is the length of the frequency hopping period of the adjacent WBAN, T ₁ is the length of the frequency hopping period of the WBAN to which the HUB belongs, and T ₁ >T ₂ , ε is the time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period, and 0≤ε<T ₂ .

In this embodiment, the frequency hopping information may include: a random seed of channel frequency hopping and information related to calculating the channel frequency hopping sequence, so as to calculate the frequency hopping sequence; the time information may include: the starting point of the channel frequency hopping period start time for clock alignment.

In this embodiment, the HUB can also send a channel frequency hopping message to the nodes in the WBAN it belongs to, telling the node the channel number of the next frequency hopping period, so that the node can change to the channel number when performing frequency hopping. on the channel corresponding to the channel number.

In this embodiment, the HUB may also broadcast T-Poll frames or beacon frames periodically, and the T-Poll frames or beacon frames include the BAN ID, HUB ID, and BAN priority of the WBAN to which the HUB belongs. level, frequency hopping period, time information for time alignment, and frequency hopping information for calculating the frequency hopping sequence.

Fig. 6 is the overall flowchart of the method of this embodiment, please refer to Fig. 6, this method comprises:

Step 601: The two adjacent HUBs obtain the BAN ID, HUB ID, BAN priority, frequency hopping period, time information and other frequency hopping information of each other's WBAN;

Step 602: Determine whether the priority of WBAN1 is equal to the priority of WBAN2; if not, execute step 603, otherwise execute step 604;

Step 603: HUBs with lower BAN priorities actively avoid conflicts;

Step 604: Judging whether the frequency hopping period of WBAN1 is equal to the priority of WBAN2; if not, then execute step 605, otherwise execute step 606;

Step 605: The HUB with the smaller frequency hopping period of the WBAN actively avoids conflicts;

Step 606: Adjacent HUBs negotiate to actively avoid the conflicting HUB;

Step 607: The HUB that actively avoids the conflict aligns the start time of the frequency hopping period according to the frequency hopping information and time information of the WBAN it belongs to and the frequency hopping information and time information of the adjacent WBAN, calculates the frequency hopping sequence, and compares the channel numbers corresponding to the frequency hopping period 1. Predict the channel that will cause conflict in the future, and then change the frequency hopping channel to avoid conflict.

Step 608: The HUB sends a frequency hopping message to the nodes in the WBAN to which it belongs, informing the nodes of the channel number of the next frequency hopping period.

Wherein, the specific processing process has been described in detail in Embodiment 1, and its content is incorporated here, and will not be repeated here.

The method of this embodiment predicts channel conflicts by obtaining relevant frequency hopping information of adjacent networks, which can reduce the probability of collisions and avoid interference. Or the beacon period is changed, which is scalable.

Example 4

This embodiment provides a wireless body area network system, and the wireless body area network system includes: a HUB and nodes.

In one embodiment, the HUB may be the HUB described in Example 2, and may include the device described in Example 1 for implementing the method described in Example 3, and the contents of Examples 1-3 are incorporated in Therefore, description is omitted here.

Through the wireless body area network system of this embodiment, the HUB predicts channel conflicts by obtaining relevant frequency hopping information of adjacent networks, which can reduce the probability of collisions and avoid interference. It is not only applicable to access methods with and without beacons, Moreover, there is no need to change the superframe period or the beacon period, and it is scalable.

An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in the information processing device or HUB, the program causes the computer to execute the avoidance described in Embodiment 3 in the information processing device or HUB. method of interference.

An embodiment of the present invention also provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method for avoiding interference described in Embodiment 3 in an information processing device or a HUB.

The above devices and methods of the present invention can be implemented by hardware, or by combining hardware and software. The present invention relates to such a computer-readable program that, when the program is executed by a logic component, enables the logic component to realize the above-mentioned device or constituent component, or enables the logic component to realize the above-mentioned various methods or steps. The present invention also relates to a storage medium for storing the above program, such as hard disk, magnetic disk, optical disk, DVD, flash memory and the like.

The present invention has been described above in conjunction with specific embodiments, but those skilled in the art should be clear that these descriptions are all exemplary and not limiting the protection scope of the present invention. Those skilled in the art can make various variations and modifications to the present invention according to the spirit and principle of the present invention, and these variations and modifications are also within the scope of the present invention.

Regarding the implementation manner comprising the above embodiments, the following additional notes are also disclosed:

Additional note 1. A device for avoiding interference, applied to a hub (HUB) in a wireless body area network (WBAN), wherein the device includes:

An acquisition unit, which acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating the frequency hopping sequence of the adjacent WBAN;

A determination unit, which determines whether to perform conflict avoidance according to the BAN priority and/or channel frequency hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;

The processing unit is configured to perform conflict 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 the HUB performs conflict avoidance.

Supplement 2. The device according to Supplement 1, wherein the device further includes:

a receiving unit, which receives the beacon or T-Poll frame sent by the HUB of the adjacent WBAN;

The acquisition unit acquires the BAN ID, HUBID, BAN priority, frequency hopping period, time information for time alignment, and time information for calculating the frequency hopping sequence of the adjacent WBAN from the beacon or T-Poll frame frequency hopping information.

Supplement 3. The device according to Supplement 1, wherein the determination unit includes:

A first comparison module, which compares the BAN priority of the WBAN to which the HUB belongs with the BAN priority of the adjacent WBAN;

A first determining module, which determines not to perform conflict avoidance when the BAN priority of the WBAN to which the HUB belongs is greater than the BAN priority of the adjacent WBAN; When the BAN priority of the adjacent WBAN is determined, conflict avoidance is performed;

The second comparison module, when the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the adjacent WBAN, compare the frequency hopping period of the WBAN to which the HUB belongs to the frequency hopping period of the adjacent WBAN Compare;

The second determination module, when the frequency hopping period of the WBAN to which the HUB belongs is greater than the frequency hopping period of the adjacent WBAN, determine not to perform conflict avoidance; when the frequency hopping period of the WBAN to which the HUB belongs is shorter than the When the frequency hopping period of the adjacent WBAN is determined, conflict avoidance is performed;

A negotiation module, which negotiates 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, to determine whether to perform conflict avoidance.

Supplement 4. The device according to Supplement 1, wherein the processing unit includes:

an alignment module, which performs 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 comparison module, which compares 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 determines whether there is conflicting channel number;

A processing module, which changes the conflicting channel number to make it different from the channel number of the frequency hopping period of the adjacent WBAN.

Supplement 5. The device according to Supplement 4, wherein,

The third comparison module is in , compare the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers;

The third comparison module is in , compare the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers;

Wherein, T ₂ is the length of the frequency hopping period of the WBAN to which the HUB belongs, T ₁ is the length of the frequency hopping period of the adjacent WBAN, or T ₂ is the length of the frequency hopping period of the adjacent WBAN, T ₁ is the length of the frequency hopping period of the WBAN to which the HUB belongs, and T ₁ >T ₂ , ε is the time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period, and 0≤ε<T ₂ .

Supplement 6. The device according to Supplement 1, wherein the device further comprises:

A sending unit, which 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 can change to the channel number corresponding to the frequency hopping when performing frequency hopping on the channel.

Supplement 7. The device according to Supplement 1, wherein the device further comprises:

A broadcast unit, which periodically broadcasts a T-Poll frame or a beacon frame, and the T-Poll frame or the beacon frame includes the BAN ID, HUB ID, BAN priority, frequency hopping period, and Time information for time alignment and frequency hopping information for calculating frequency hopping sequences.

Supplement 8. The device according to Supplement 1, wherein,

The frequency hopping information includes: a random seed for channel frequency hopping and information related to calculating a channel frequency hopping sequence;

The time information includes: the start time of the channel frequency hopping period.

Supplementary note 9. A hub in a wireless body area network, wherein the hub (HUB) is configured as:

Obtain the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating the frequency hopping sequence of adjacent WBANs;

Determine whether to perform conflict avoidance according to the BAN priority and/or channel frequency hopping period of the WBAN to which the HUB belongs and the adjacent WBAN;

If conflict avoidance is performed, conflict avoidance is performed 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.

Supplementary note 10. A method for avoiding interference, applied to a hub (HUB) in a wireless body area network (WBAN), wherein the method includes:

The HUB acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment and frequency hopping information for calculating the frequency hopping sequence of the adjacent WBAN;

The HUB determines whether to perform conflict avoidance according to the BAN priority and/or channel frequency hopping period of the WBAN to which it belongs and the adjacent WBAN;

If conflict avoidance is performed, the HUB performs conflict avoidance according to the frequency hopping information and time information of the WBAN to which it belongs and the frequency hopping information and time information of the neighboring WBAN.

Supplement 11. The method according to Supplement 10, wherein,

The HUB acquires the BAN ID, HUB ID, BAN priority, frequency hopping period, time information for time alignment, and It is used to calculate the frequency hopping information of the frequency hopping sequence.

Supplement 12. The method according to Supplement 10, wherein the HUB determines whether to perform conflict avoidance, including:

The HUB compares the BAN priority of the WBAN it belongs to with the BAN priority of the neighboring WBAN;

If the BAN priority of the WBAN to which the HUB belongs is greater than the BAN priority of the neighboring WBAN, then determine not to perform conflict avoidance;

If the BAN priority of the WBAN to which the HUB belongs is less than the BAN priority of the adjacent WBAN, determine to avoid conflicts;

If the BAN priority of the WBAN to which the HUB belongs is equal to the BAN priority of the adjacent WBAN, the HUB compares the frequency hopping period of the WBAN to which it belongs with the frequency hopping period of the adjacent WBAN;

If the frequency hopping period of the WBAN to which the HUB belongs is greater than the frequency hopping period of the adjacent WBAN, then determine not to perform conflict avoidance;

If the frequency hopping period of the WBAN to which the HUB belongs is smaller than the frequency hopping period of the adjacent WBAN, determine to perform conflict avoidance;

If the frequency hopping period of the WBAN to which the HUB belongs is equal to the frequency hopping period of the adjacent WBAN, the HUB negotiates with the HUB of the adjacent WBAN to determine whether to perform conflict avoidance.

Supplement 13. The method according to Supplement 1, wherein the HUB performing conflict avoidance includes:

performing clock alignment on 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 the conflicting channel number;

Changing the number of the conflicting channel to make it different from the channel number of the frequency hopping period of the adjacent WBAN.

Supplement 14. The method according to Supplement 13, wherein,

if Then compare the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers;

if Then compare the channel number in the mth frequency hopping period in the adjacent WBAN with the nth, n+1, n+2,..., Compare the channel numbers within a frequency hopping period to determine the conflicting channel numbers;

Wherein, T ₂ is the length of the frequency hopping period of the WBAN to which the HUB belongs, T ₁ is the length of the frequency hopping period of the adjacent WBAN, or T ₂ is the length of the frequency hopping period of the adjacent WBAN, T ₁ is the length of the frequency hopping period of the WBAN to which the HUB belongs, and T ₁ >T ₂ , ε is the time difference between the start time of the mth frequency hopping period and the start time of the nth frequency hopping period, and 0≤ε<T ₂ .

Supplement 15. The method according to Supplement 10, wherein the method further includes:

The HUB sends a channel frequency hopping message to the node in the WBAN to which it belongs, telling the node the channel number of the next frequency hopping cycle, so that the node can change to the channel corresponding to the channel number when performing frequency hopping .

Supplement 16. The method according to Supplement 10, wherein the method further includes:

The HUB periodically broadcasts T-Poll frames or beacon frames, and the T-Poll frames or beacon frames include the BAN ID, HUB ID, BAN priority, frequency hopping period, user Time information for time alignment and frequency hopping information for calculating frequency hopping sequences.

Supplement 17. The method according to Supplement 10, wherein,

The frequency hopping information includes: a random seed for channel frequency hopping and information related to calculating a channel frequency hopping sequence;

The time information includes: the start time of the channel frequency 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.