A data transmission protection method and device
A data transmission and responder technology, applied in wireless communication, electrical components, etc., can solve problems such as low efficiency, inability to protect multicast data, and over-protection
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Embodiment 1
[0186] The AP and multiple stations STA1~STA10 form a BSS. The AP establishes multicast service 1 with STA1~STA8, and assigns a multicast MAC address to identify the multicast service. The multicast MAC address is the same as the unicast MAC address ( For example, the main difference between the MAC addresses of STA1~STA10) is that the multicast address sets the I / G bit of the address to 1, and the unicast address sets this bit to 0. For example, in the 802.11 standard, the MAC address of 48bits (B0~B47) The B40 is the I / G bit. As an implementation manner, the multicast service may also be identified by other bits of the MAC address.
[0187] The AP obtains the sending opportunity to send multicast data, such as Figure 5 As shown, in order to protect the multicast data to be sent, the AP performs RTS / CTS interaction before sending the multicast data. Unlike the traditional RTS / CTS interaction, the AP sends an RTS frame whose receiving address is set to the multicast address....
Embodiment 2
[0195] This embodiment describes different response factors and the situation of judging whether it is possible to send a CTS. Similar to Embodiment 1, the AP and multiple stations STA1-STA10 form a BSS, and the AP establishes a multicast service with STA1-STA8, and assigns a group The multicast MAC address is used to identify the multicast service.
[0196] The AP sends an RTS frame whose receiving address is set to a multicast address. The multicast address is the multicast address corresponding to the multicast service negotiated with STA1~STA8 in advance. The corresponding I / G bit is set to 1, which means the receiving address is multicast. address, STA1 finds that it belongs to the receiver of the multicast service, then STA1 is a station that may need to respond, but whether to respond needs to be further judged, STA1 generates a probability P of sending a CTS, and the probability P can be related to many factors. For example, it can be inversely proportional to the ener...
Embodiment 3
[0205] This embodiment describes different response factors and the situation of judging whether it is possible to send a CTS. Similar to Embodiment 1, the AP and multiple stations STA1-STA10 form a BSS, and the AP establishes a multicast service with STA1-STA8, and assigns a group The multicast MAC address is used to identify the multicast service.
[0206] Assume that the multicast data receiver uses a random backoff mechanism to decide whether to send a CTS. Specifically, the station generates a random number a, where a is a non-negative integer that obeys the uniform distribution of [0, CW]. broadcast address, and is the RTS frame of the self-associated multicast service, the random number a is subtracted by 1 or n, and if a becomes 0, a CTS can be sent, and the CW is a contention window. Specifically, as follows:
[0207] The AP sends an RTS frame whose receiving address is set to a multicast address. The multicast address is the multicast address corresponding to the mu...
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