A Network Selection Scheme to Meet Heterogeneous QoS for Massive MTC in SAGIN

Cellular networks face a significant problem of high preamble collision rates due to numerous machine-type communication devices (MTCD) attempting to connect. Moreover, addressing the issue of reducing the collision rate while satisfying various types of Quality-of-Service (QoS) has become even more challenging. A Space-Air-Ground Integrated Network (SAGIN) can be a good solution to reduce the preamble collision rate while meeting the QoS of MTCDs. To address this issue, a network selection scheme is proposed in this paper. The network selection scheme consists of a dynamic Access class barring (ACB) value setting phase and a network selection phase. In the dynamic ACB value setting phase, the ACB value is dynamically adjusted based on the strength of the QoS. In the network selection phase, the MTCD selects a network to attempt random access from the space network, air network, or ground network based on the configured ACB value. Simulations are performed to demonstrate the performance of the proposed scheme. The experiments confirm that the proposed scheme achieves a higher random access success rate and a lower average preamble transmission count compared to traditional random access methods.