Method for filtering redundant data packet at node in bluetooth mesh network
The present disclosure provides a method for filtering a redundant data packet at a node in a Bluetooth Mesh network. The method comprises the following steps: providing a deduplication filtering cache for storing a combined field value of one or more specified fields of each of one or more Bluetooth Mesh data packets received by the node; upon receipt of a Bluetooth Mesh data packet by the node, comparing a combined field value of one or more specified fields of the data packet with each combined field value stored in the deduplication filtering cache, so as to determine whether the received Bluetooth Mesh data packet is a redundant data packet. Compared with the prior art, the method of the present disclosure may help to determine whether the data packet is the redundant data packet without decrypting the encrypted fields and de-obfuscating the obfuscated fields, which greatly simplifies the processing flow.
1. A method for filtering a redundant data packet at a node in a Bluetooth Mesh network, comprising the following steps of:
providing a deduplication filtering cache for storing a combined field value of one or more specified fields of each of one or more Bluetooth Mesh data packets received by the node, wherein the combined field value of specified fields includes at least one obfuscated field value; and
upon receipt of a Bluetooth Mesh data packet by the node, comparing a combined field value of one or more specified fields of the data packet with each combined field value stored in the deduplication filtering cache, wherein:
discarding the data packet if the combined field value of the one or more specified fields of the data packet is the same as a combined field value stored in the deduplication filtering cache; and
storing the combined field value of the one or more specified fields of the data packet into the deduplication filtering cache and reporting the data packet to a same layer or an upper layer in a protocol stack if the combined field value of the one or more specified fields of the data packet is not the same as any combined field value stored in the deduplication filtering cache.
2. The method according to claim 1 , wherein the one or more specified fields of the data packet comprises a SEQ field and a SRC field, and the combined field value comprises obfuscated field values of the SEQ field and the SRC field.
3. The method according to claim 2 , wherein the one or more specified fields of the data packet further comprises an NID field, and the combined field value further comprises a field value of the NID field.
4. The method according to claim 1 , further comprising:
comparing an NID of the received data packet with NIDs of one or more Bluetooth Mesh networks joined by the node prior to performing a comparison for the combined field value; and
discarding the data packet if the NID of the received data packet is different from each of the NIDs of the one or more Bluetooth Mesh networks joined by the node.
5. The method according to claim 1 , wherein the deduplication filtering cache is provided at a Bluetooth Mesh network layer or a lower layer.
6. The method according to claim 5 , wherein the deduplication filtering cache is provided at a Bluetooth link layer.
7. The method according to claim 1 , wherein if the deduplication filtering cache is full when the combined field value is to be stored into the deduplication filtering cache, discarding an oldest combined field value in the deduplication filtering cache.
8. The method according to claim 1 , wherein the received data packet is a valid Bluetooth Mesh data packet or an invalid Bluetooth Mesh data packet.
9. The method according to claim 8 , wherein the received data packet is a data packet from one or more Bluetooth Mesh networks joined by the node or a data packet from a Bluetooth Mesh network not joined by the node.
10. The method according to claim 1 , wherein the step of discarding the data packet is performed prior to de-obfuscating and decrypting the received data packet.