Table 2 Data uploading process of the proposed mechanism

The IoT devices broadcast their data transmission requests to AP through CC channel.

The AP decides whether devices’ requests can be approved according to equation (14).

while the current slot is idle, set as T=0do

The AP informs IoT devices for bids submission.

The IoT devices compute their bids by urgency function G_i and f(s_i,T_i) according to equation (7), then submit bid b_i to AP for devices i∈M.

The AP selects the highest bid among devices, and the winning device begins its data transmission.

After the data uploading finished, set \(T=T+\bar {s_{i}}\), where \(\bar {s_{i}}\) is the data length of winning device.

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