NB-IoT Paging Data Transmission for RRC Idle State

The patent extracts and removes unnecessary control message procedures from the LTE protocol stack for NB-IoT. Specifically, it eliminates the RRC connection setup procedure for small data transmissions by allowing direct transmission of uplink data in the RRC idle state using the RRC connection request message, and allows downlink data to be delivered via paging messages without requiring RRC connection establishment. This extraction of unnecessary steps directly reduces control message complexity while maintaining LTE compatibility.

The patent inverts the traditional LTE data transmission flow by allowing data transmission before RRC connection establishment. In conventional LTE, the terminal must first establish an RRC connection before transmitting user data. The NB-IoT optimization reverses this by permitting small data packets to be transmitted in the RRC idle state, with uplink data carried in the connection request message and downlink data delivered through paging messages, thereby eliminating the need for intermediate connection setup procedures.

The patent removes unnecessary intermediate message procedures from the terminal access and data transmission process. By allowing small data transmissions to occur directly in the RRC idle state without requiring full RRC connection establishment, the patent extracts and eliminates redundant signaling steps while maintaining reliable data delivery through the use of existing robust messaging mechanisms like paging and connection request messages.

The patent applies partial action by performing only the minimum necessary procedures for small data transmissions. Instead of executing the complete LTE RRC connection setup sequence, the system performs a truncated version that suffices for small data packets, transmitting uplink data in the connection request and delivering downlink data via paging, thereby achieving the required reliability with reduced system load.

The patent applies local quality by creating NB-IoT-specific optimizations tailored to low data rate scenarios. The system introduces NB-adapted message procedures that differ from the general LTE protocol, allowing small data transmissions to be handled through simplified local procedures (data in paging/connection request messages) rather than the universal LTE RRC connection setup, thereby optimizing for the specific quality requirements of NB-IoT applications.

The patent segments the data transmission process into distinct size-based categories. Small data packets are handled through a specialized simplified path using paging and connection request messages, while larger data transmissions would follow the standard LTE procedure. This segmentation allows the system to apply the appropriate level of complexity based on data size requirements, optimizing for low data rate scenarios without compromising the ability to handle larger transmissions.