Random Access techniques are many, most of which are designed for a limited number of mobile nodes. However, in a 5G Internet of Things environment, the design of random access must accommodate a very large number of devices which are heterogeneous in nature, and packets are in general short and come in a variety of lengths. Variable lengths of short packets may waste bandwidth if each packet transmits at the beginning of a time slot. In this paper, packet squeezing allows for a packet to make a selection between aligning to the beginning and aligning to the ending of a time slot. Two or more nodes transmitting at the same time slot may not result in a collision if two conditions are met simultaneously. First, one node selects an alignment mode different from that of the remaining nodes. Secondly, the sum of the time durations of two “representative” packets is shorter than the duration of a time slot. The performance analysis demonstrates that the throughput gain due to the packet squeezing is significant. The gain of packet squeezing can be enhanced by time slot management, where a transmitting node randomly selects a set of points of Finite Projective Plane and transmits at the time slots corresponding to the points of the chosen set. Due to the rather uniform distribution of the transmitting nodes and fewer empty time slots, the gain of packet squeezing is further improved for the entire frame. Based on the simulation results and analysis, we have observed that the time slot management extends the range of packet arrival rate of peak throughput for packet squeezing. Lastly, we compare and contrast the combining of packet squeezing and time slot management with well-known random access protocols of IoT such as slotted ALOHA and NOMA, and simulate real systems to verify the results of performance analysis.

随机访问技术很多，其中大多数是为有限数量的移动节点设计的。但是，在5G物联网环境中，随机访问的设计必须容纳本质上异构的大量设备，并且数据包通常很短且具有各种长度。如果每个数据包在一个时隙的开始进行传输，则可变长度的短数据包可能会浪费带宽。在本文中，分组压缩允许分组在对齐时隙的开始和对齐时隙的结束之间进行选择。如果同时满足两个条件，则在同一时隙传输的两个或多个节点可能不会导致冲突。首先，一个节点选择与其余节点不同的对齐模式。其次，两个“代表性”分组的持续时间之和比一个时隙的持续时间短。性能分析表明，由于数据包压缩而带来的吞吐率收益显着。可以通过时隙管理来增强分组压缩的增益，在该时隙管理中，发送节点随机选择有限投影平面的一组点，并在与所选集合的各点相对应的时隙处进行发送。由于发送节点的分布相当均匀，并且空闲时隙较少，因此整个帧的数据包压缩增益得到了进一步提高。根据仿真结果和分析，我们发现时隙管理扩展了峰值吞吐量的包到达率范围，以进行包压缩。最后，