CN113163346A - Broadcast packet filtering method and wireless communication system - Google Patents
Broadcast packet filtering method and wireless communication system Download PDFInfo
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- CN113163346A CN113163346A CN202110430157.8A CN202110430157A CN113163346A CN 113163346 A CN113163346 A CN 113163346A CN 202110430157 A CN202110430157 A CN 202110430157A CN 113163346 A CN113163346 A CN 113163346A
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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Abstract
The invention discloses a broadcast data packet filtering method and a wireless communication system, and relates to the technical field of wireless communication. The broadcast data packet filtering method comprises the following steps: initializing an address buffer queue and starting scanning; sequentially carrying out MAC address processing on the scanned broadcast data packets to judge whether address information in the broadcast data packets is repeated in an address cache queue; when the address information in the broadcast data packet is repeated in the address cache queue, judging whether the broadcast data packet is a new data packet or not according to the additional information in the broadcast data packet; if the broadcast data packet is a new data packet, reporting the broadcast data packet, and if the broadcast data packet is not the new data packet, continuing to scan; when the address information in the broadcast data packet is not repeated in the address cache queue, reporting the broadcast data packet and continuing to scan; when a scan end command is received, the scan is ended.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a broadcast packet filtering method and a wireless communication system.
Background
In a wireless communication system, Bluetooth is taken as a near field communication technology and is widely applied to industries such as various mobile terminals, Internet of things, health care, intelligent home furnishing and the like at present, and a Bluetooth module is favored by equipment manufacturers due to the fact that a Bluetooth protocol stack, a radio frequency part and an antenna are integrated, so that product design of the manufacturers can be greatly simplified, research and development cost is saved, time of coming into the market of new products is shortened, and market share of the manufacturers is improved.
The most important feature of the bluetooth low energy system is to support low energy consumption, mainly for device connection that does not occupy too much bandwidth, such as: smart homes (bluetooth locks and bluetooth lamps), data transmission of sensing equipment (sphygmomanometers and temperature sensors), consumer electronics (electronic cigarettes and remote control toys) and the like.
In the Bluetooth system, a host sends a downlink command to a Bluetooth controller for scanning and broadcasting, and the Bluetooth controller starts to scan and receive a broadcast data packet and then reports the broadcast data packet to host equipment. The broadcast packet contains a MAC address, also referred to as BD _ ADDR. In some scenarios, the bluetooth controller is required not to send repeated broadcast packets, so as to reduce the burden of the host in processing broadcast data packets. In order to determine whether the broadcast packet is a repeated broadcast packet, the bluetooth controller needs to store information such as a broadcast address received in the past in a local area, and if a large number of peripheral devices are needed and a good filtering effect is needed, a large cache is needed. However, in order to meet the requirements of low cost and low power consumption, it is not practical to use a large cache, so that a compromise design needs to be made in the design for the filtering effect and the cache size.
Disclosure of Invention
The invention mainly aims to provide a broadcast data packet filtering method and a wireless communication system, aiming at realizing good repeated MAC address filtering effect without needing larger buffer.
In order to achieve the above object, the present invention provides a broadcast packet filtering method, which comprises the following steps:
initializing an address buffer queue and starting scanning;
sequentially carrying out MAC address processing on the scanned broadcast data packets to judge whether address information in the broadcast data packets is repeated in the address cache queue;
when the address information in the broadcast data packet is repeated in the address cache queue, judging whether the broadcast data packet is a new data packet or not according to the additional information in the broadcast data packet; if the broadcast data packet is a new data packet, reporting the broadcast data packet, and if the broadcast data packet is not the new data packet, continuing to scan;
when the address information in the broadcast data packet is not repeated in the address cache queue, adding the current address information to the tail of the address cache queue, reporting the broadcast data packet and continuing to scan;
when a scan end command is received, the scan is ended.
Preferably, the MAC address processing of the scanned broadcast packet includes the following steps:
judging whether the address information in the current broadcast data packet is in the address cache queue;
when the address cache queue comprises the address information which is the same as the current address information, deleting the address information from the current address cache queue, and adding the address information to the tail of the address cache queue; finishing MAC address processing and returning address information as a repeated mark;
when the address information in the address cache queue is different from the current address information, adding the current address information to the tail of the address cache queue; and finishing the MAC address processing and returning the address information as a non-repeated mark.
Preferably, the address duplication flag is set to the no duplication flag before the broadcast packet is subjected to MAC address processing.
Preferably, when the address information in the address cache queue is different from the current address information, determining whether the number of the address information cached in the address cache queue is a preset maximum depth of the queue:
if the number of the address information in the current address cache queue is less than the maximum depth of the queue, adding the current address information to the tail of the address cache queue;
and if the number of the address information in the current address cache queue is equal to the maximum depth of the queue, deleting the first address information in the address cache queue, and adding the current address information to the tail of the address cache queue.
Preferably, the initializing the address buffer queue includes: and emptying the address information in the address cache queue.
Preferably, the additional information in the broadcast packet includes data information.
The present invention also provides a wireless communication system including a terminal that receives a command sent by a host and scans for broadcast packets, the terminal comprising:
means for receiving a scanning broadcast packet;
the equipment is used for caching the address information in the broadcast data packet so as to form an address caching queue;
the device is used for carrying out MAC address processing on the address information, judging whether the address information is repeated or not and returning an address repetition mark;
a device for judging whether the broadcast data packet is a new data packet or not according to the additional information in the broadcast data packet when the address information in the broadcast data packet is repeated in the address cache queue;
and the equipment is used for reporting the broadcast data packet.
Preferably, the apparatus for performing MAC address processing on the address information, determining whether the address information is repeated, adding the address information to the end of the address cache queue, and returning an address repetition flag further includes:
a sub-module for judging whether the address information in the current broadcast data packet is in the address buffer queue;
a submodule, configured to delete the address information from the current address cache queue when the address cache queue includes address information that is the same as the current address information, and add the address information to the end of the address cache queue;
a sub-module, configured to add current address information to the end of the address cache queue when the address information in the address cache queue is different from the current address information;
and ending the MAC address processing and returning the submodule with the address repetition mark.
Preferably, the address repetition flag includes a repetition flag and a non-repetition flag:
when the address cache queue comprises the address information which is the same as the current address information, returning a repeat mark;
and when the address information in the address cache queue is different from the current address information, returning a non-repeated mark.
Preferably, the apparatus for performing MAC address processing on the address information, determining whether the address information is duplicated, and returning an address duplication flag further includes:
and the submodule is used for judging whether the address information amount cached in the address cache queue is the preset maximum queue depth or not when the address information in the address cache queue is different from the current address information.
According to the technical scheme, the address information in the broadcast data packet is subjected to MAC address processing, and the address information is added to the tail of the address cache queue, so that repeated broadcast data packets are matched more easily in probability, and are filtered by an algorithm, and a good repeated MAC address filtering effect can be realized without a large cache condition.
Drawings
FIG. 1 is a flow chart illustrating a broadcast packet filtering method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a MAC address processing method in a broadcast packet filtering method according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention is further described below with reference to the accompanying drawings.
The broadcast data packet filtering method of the embodiment of the invention is mainly used in a communication system, particularly a wireless communication system, such as a common Bluetooth wireless communication system. The main working process of the system is as follows: the host sends a downlink command to the terminal controller for scanning and broadcasting, and the terminal controller starts to scan and receive the broadcast data packet and then reports the broadcast data packet to the host.
As shown in fig. 1, the broadcast packet filtering method according to the embodiment of the present invention includes the following steps:
and S1, initializing the address buffer queue and starting scanning.
Specifically, when the terminal controller starts to work, the address information in the address buffer queue is emptied, that is, the address buffer queue is initialized. After the terminal controller starts working, the address buffer queue does not need to be emptied again, so that the address information in the address buffer queue is ensured to be easily matched with the repeated broadcast data packet, and the filtering effect is increased. When the terminal controller starts to work, the terminal controller receives a control command sent by the host and starts to scan the broadcast packet.
And S2, sequentially performing MAC address processing on the scanned broadcast data packets to judge whether the address information in the broadcast data packets is repeated in the address buffer queue.
Specifically, the scanned broadcast packets are sequentially subjected to MAC address processing, and address repetition flags are returned. The address repetition flag includes address repetition and address non-repetition. When the address information in the broadcast data packet is the same as the address information in the address cache queue, the return address is repeated; when the address information in the broadcast data packet is different from the address information in the address cache queue, the return address is not repeated.
S3, when the address information in the broadcast data packet is repeated in the address buffer queue, judging whether the broadcast data packet is a new data packet according to the additional information in the broadcast data packet; if the broadcast data packet is a new data packet, reporting the broadcast data packet, and if the broadcast data packet is not the new data packet, continuing to scan;
specifically, the information within the broadcast packet includes address information and data information. When the address information is the same, whether the current broadcast data packet is a repeated broadcast data packet is judged by judging whether the additional information is the same, wherein the additional information comprises data information.
S4, when receiving the scan end command, the scan is ended.
Specifically, when the scanning needs to be finished, the host sends a scanning end command to the terminal controller to end the scanning process.
In a preferred embodiment, as shown in fig. 2, the MAC address processing of the scanned broadcast packet includes the following steps:
and S21, judging whether the address information in the current broadcast data packet is in the address buffer queue.
Specifically, the current address information is compared with all address information in the address buffer queue to determine whether the current address information has repeated address information in the address buffer queue.
S22, when the address cache queue includes the same address information as the current address information, deleting the address information from the current address cache queue, and adding the address information to the tail of the address cache queue; and finishing the MAC address processing and returning the address information as a repeated mark.
Specifically, when address information is repeated in the address cache queue, the same address information in the original address cache queue is deleted, and then the current address information is added to the tail of the address cache queue to form a new address cache queue, that is, the position of the address information in the original address cache queue is moved to the tail of the address cache queue to form a new address cache queue. Therefore, the broadcast data packets (active elements) which are repeatedly received can be reserved as much as possible, the active elements which are relatively easy to scan are ensured to be matched more easily in probability, and a better filtering effect can be achieved.
S23, when the address information in the address cache queue is different from the current address information, adding the current address information to the tail of the address cache queue; and finishing the MAC address processing and returning the address information as a non-repeated mark.
Preferably, the address duplication flag is preset to the no duplication flag before the broadcast packet is MAC address processed.
In a preferred embodiment, as shown in fig. 2, step S23 further includes:
when the address information in the address cache queue is different from the current address information, judging whether the address information amount cached in the address cache queue is a preset maximum queue depth:
if the number of the address information in the current address cache queue is less than the maximum depth of the queue, adding the current address information to the tail of the address cache queue; and if the number of the address information in the current address cache queue is equal to the maximum depth of the queue, deleting the first address information in the address cache queue, and adding the current address information to the tail of the address cache queue.
Specifically, the maximum depth of the queue is the maximum amount of address information that can be stored in the address buffer queue. In particular embodiments, the maximum depth of the queue may be determined by the buffer size, resource allocation, etc. of the system. Under the condition that the address cache queue is full, inactive elements (broadcast data packets which are not received for a long time) are removed, and the active elements are reserved, so that the active elements are matched more easily, are filtered out by an algorithm, are better than the traditional method in effect, and obtain better filtering effect under the condition of smaller cache.
Preferably, the initializing the address buffer queue includes: and emptying the address information in the address cache queue.
Preferably, the additional information in the broadcast packet includes data information.
In the embodiment of the present invention, the maximum depth of the preset queue is 4, and in the actual working process, the maximum depth of the queue is related to the buffer and resource allocation of the system. In the MAC address processing process, the address information in the received broadcast packet is in turn:
7F:5B:E9:EC:BB:1C
08:BA:6D:A2:9A:1B
52:D2:F2:C2:A5:8A
67:9F:67:A6:10:73
08:BA:6D:A2:9A:1B
C9:54:66:59:19:24
08:BA:6D:A2:9A:1B
6E:88:55:B9:03:A3
67:9F:67:A6:10:73
……
as shown in the address cache queue processing table 1-4, the address information of the broadcast data packets 1 to 4 is sequentially inserted into the address cache queue and returned as a non-repeat mark because the queue element is less than 4;
when broadcasting the data packet 5, as shown in table 5, the address information 08: BA:6D: a2:9A:1B is provided, and the same address information is provided at the second element position in the address cache queue, and the address information in the address cache queue is deleted, and then the 08: BA:6D: a2:9A:1B is inserted at the end of the address cache queue; returning address information as a repeated mark;
when the 6 th broadcast packet is received, as shown in table 6, the address information is C9:54:66:59:19:24, if the same address information does not exist in the address buffer queue, the address information of the first element position in the current address buffer queue is deleted, and C9:54:66:59:19:24 is inserted into the tail of the address buffer queue to form a new address buffer queue; and returns the address information as a non-repeated mark;
the subsequent broadcast packets are processed in sequence according to the above steps, as shown in tables 7 to 9, until the scan end command is received.
Still other embodiments provide a wireless communication system including a terminal that receives a command transmitted by a host and scans for broadcast packets, the terminal including:
means for receiving a scanning broadcast packet; the equipment is used for caching the address information in the broadcast data packet so as to form an address caching queue; the device is used for carrying out MAC address processing on the address information, judging whether the address information is repeated or not and returning an address repetition mark; a device for judging whether the broadcast data packet is a new data packet or not according to the additional information in the broadcast data packet when the address information in the broadcast data packet is repeated in the address cache queue; and the equipment is used for reporting the broadcast data packet.
Preferably, the apparatus for performing MAC address processing on the address information, determining whether the address information is repeated, adding the address information to the end of the address cache queue, and returning an address repetition flag further includes:
a sub-module for judging whether the address information in the current broadcast data packet is in the address buffer queue;
a submodule, configured to delete the address information from the current address cache queue when the address cache queue includes address information that is the same as the current address information, and add the address information to the end of the address cache queue;
a sub-module, configured to add current address information to the end of the address cache queue when the address information in the address cache queue is different from the current address information;
and ending the MAC address processing and returning the submodule with the address repetition mark.
Preferably, the address repetition flag includes a repetition flag and a non-repetition flag:
when the address cache queue comprises the address information which is the same as the current address information, returning a repeat mark;
and when the address information in the address cache queue is different from the current address information, returning a non-repeated mark.
Preferably, the apparatus for performing MAC address processing on the address information, determining whether the address information is duplicated, and returning an address duplication flag further includes:
and the submodule is used for judging whether the address information amount cached in the address cache queue is the preset maximum queue depth or not when the address information in the address cache queue is different from the current address information.
The working principle of the wireless communication system of the embodiment of the invention is as follows: the host sends a command to the terminal, and the terminal reports the broadcast data packet to the host after scanning the received broadcast data packet. The terminal initializes the address buffer queue and starts scanning. And sequentially carrying out MAC address processing on the scanned broadcast data packet to judge whether the address information in the broadcast data packet is repeated in the address buffer queue: judging whether the address information in the current broadcast data packet is in the address cache queue; when the address cache queue comprises the address information which is the same as the current address information, deleting the address information from the current address cache queue, and adding the address information to the tail of the address cache queue; finishing MAC address processing and returning address information as a repeated mark; when the address information in the address cache queue is different from the current address information, judging whether the address information amount cached in the address cache queue is the preset maximum queue depth or not, and if the address information amount in the current address cache queue is smaller than the maximum queue depth, adding the current address information to the tail of the address cache queue; if the number of the address information in the current address cache queue is equal to the maximum depth of the queue, deleting the first address information in the address cache queue, and adding the current address information to the tail of the address cache queue; and finishing the MAC address processing and returning the address information as a non-repeated mark.
When the address information in the broadcast data packet is repeated in the address cache queue, judging whether the broadcast data packet is a new data packet or not according to the additional information in the broadcast data packet; if the broadcast data packet is a new data packet, reporting the broadcast data packet, and if the broadcast data packet is not the new data packet, continuing to scan; and when the address information in the broadcast data packet is not repeated in the address cache queue, adding the current address information to the tail of the address cache queue, reporting the broadcast data packet and continuously scanning. When an end scan command is received, scanning is ended.
It should be understood that the above is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for filtering broadcast packets, comprising the steps of:
initializing an address buffer queue and starting scanning;
sequentially carrying out MAC address processing on the scanned broadcast data packets to judge whether address information in the broadcast data packets is repeated in the address cache queue;
when the address information in the broadcast data packet is repeated in the address cache queue, judging whether the broadcast data packet is a new data packet or not according to the additional information in the broadcast data packet; if the broadcast data packet is a new data packet, reporting the broadcast data packet, and if the broadcast data packet is not the new data packet, continuing to scan;
when the address information in the broadcast data packet is not repeated in the address cache queue, reporting the broadcast data packet and continuing to scan;
when a scan end command is received, the scan is ended.
2. The method as claimed in claim 1, wherein the step of performing MAC address processing on the scanned broadcast packet comprises the steps of:
judging whether the address information in the current broadcast data packet is in the address cache queue;
when the address cache queue comprises the address information which is the same as the current address information, deleting the address information from the current address cache queue, and adding the address information to the tail of the address cache queue; finishing MAC address processing and returning address information as a repeated mark;
when the address information in the address cache queue is different from the current address information, adding the current address information to the tail of the address cache queue; and finishing the MAC address processing and returning the address information as a non-repeated mark.
3. The method of claim 2, wherein the address duplication flag is set to a no duplication flag before the broadcast packet is MAC address processed.
4. The method as claimed in claim 2, wherein when the address information in the address buffer queue is different from the current address information, determining whether the number of the address information buffered in the address buffer queue is a preset maximum depth of the queue:
if the number of the address information in the current address cache queue is less than the maximum depth of the queue, adding the current address information to the tail of the address cache queue;
and if the number of the address information in the current address cache queue is equal to the maximum depth of the queue, deleting the first address information in the address cache queue, and adding the current address information to the tail of the address cache queue.
5. The method of claim 1, wherein initializing the address buffer queue comprises:
and emptying the address information in the address cache queue.
6. The method of claim 1, wherein the additional information in the broadcast packet comprises data information.
7. A wireless communication system comprising a terminal for receiving a command sent by a host and scanning for broadcast packets, the terminal comprising:
means for receiving a scanning broadcast packet;
the equipment is used for caching the address information in the broadcast data packet so as to form an address caching queue;
the device is used for carrying out MAC address processing on the address information, judging whether the address information is repeated or not and returning an address repetition mark;
a device for judging whether the broadcast data packet is a new data packet or not according to the additional information in the broadcast data packet when the address information in the broadcast data packet is repeated in the address cache queue;
and the equipment is used for reporting the broadcast data packet.
8. The wireless communication system according to claim 7, wherein the apparatus for performing MAC address processing on the address information, determining whether the address information is duplicated, adding the address information to the end of the address buffer queue, and returning an address duplication flag further comprises:
a sub-module for judging whether the address information in the current broadcast data packet is in the address buffer queue;
a submodule, configured to delete the address information from the current address cache queue when the address cache queue includes address information that is the same as the current address information, and add the address information to the end of the address cache queue;
a sub-module, configured to add current address information to the end of the address cache queue when the address information in the address cache queue is different from the current address information;
and ending the MAC address processing and returning the submodule with the address repetition mark.
9. The wireless communication system of claim 8, wherein the address repetition flag comprises a repetition flag and a non-repetition flag:
when the address cache queue comprises the address information which is the same as the current address information, returning a repeat mark;
and when the address information in the address cache queue is different from the current address information, returning a non-repeated mark.
10. The wireless communication system according to claim 8, wherein the device for performing MAC address processing on the address information, determining whether the address information is duplicated, and returning an address duplication flag further comprises:
and the submodule is used for judging whether the address information amount cached in the address cache queue is the preset maximum queue depth or not when the address information in the address cache queue is different from the current address information.
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| CN111885562A (en) * | 2020-07-01 | 2020-11-03 | 精伦电子股份有限公司 | Bluetooth networking method and system |
| CN112269747A (en) * | 2020-10-19 | 2021-01-26 | 天津光电通信技术有限公司 | Method for realizing time slot data packet recombination by time division multiplexing buffer memory |
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