Abstract: A multi-queue single-FIFO scheme for quality of service oriented communication. According to the invention, an arbiter maintains a number of next access pointers for multiple queues storing data packets to be transmitted. The arbiter also determines which queue is to be serviced next contingent upon a quality of service policy and then fetches at least one data packet, identified by the chosen queue's next access pointer, through a peripheral bus by means of direct memory access (DMA). A single FIFO buffer is connected to the arbiter to store and manage the fetched data packet in a first-in-first-out manner. Following the FIFO buffer, physical layer interface logic accepts each data packet, if available, and prepares the data packet for transmission on a physical medium.

Abstract: A method and apparatus for performing secure communication in a WLAN environment. According to the invention, a decryption table is provided, which includes several entries each having a number of sections to store at least one check item, at least one characteristic value, a secret key and a cipher type. The check item is employed to indicate which field of the encrypted packet needs to be compared with the characteristic value in the same entry of the decryption table. In response to receipt of an encrypted packet, one entry in sequence is selected from the decryption table. Then at least one field to be checked is extracted from the encrypted packet contingent on the check item in the selected entry. Upon successful matching of the extracted field to the characteristic value in the selected entry, the secret key and the cipher type in this entry are applied to decrypt the encrypted packet.

Abstract: A method and a device for detecting a preamble type of a wireless data frame are provided The preamble has a synchronization (SYNC) field and a start frame delimiter (SFD) field, and the method comprises following steps. The wireless data frame is first received, and then determined whether the wireless data frame has a short preamble. When the wireless data frame has the short preamble, the wireless data frame is transmitted to a MAC device. In addition, if the wireless data frame does not have the short preamble, it determines whether the wireless data frame has a long preamble. When the wireless data frame has the long preamble, the wireless data frame is then transmitted to the MAC device.