Multicast Paging Frame Allocation for IoT Power Saving

The patent implements discontinuous reception (DRX) cycles where devices alternate between sleep mode and active monitoring periods. During each DRX cycle, the device wakes up at specific paging frames to check for multicast data notifications, then returns to sleep mode. This periodic monitoring approach maintains data reception reliability by ensuring devices check for updates at regular intervals while dramatically reducing power consumption compared to continuous monitoring.

The patent introduces dynamic DRX cycle length adjustment where the monitoring interval can be adapted based on service requirements and device state. The network can configure different DRX cycle lengths (e.g., short DRX for urgent data, long DRX for power-saving scenarios) and devices can transition between different DRX modes. This dynamic approach allows the system to optimize the balance between timely data reception and battery life consumption based on current conditions.

The patent segments the monitoring population by assigning different paging frames and paging occasions to different devices or device groups based on their identifiers (e.g., IMSI, group ID). Instead of all devices monitoring the same paging channel simultaneously, devices are distributed across multiple paging frames within a DRX cycle. This segmentation reduces collision and contention on the paging channel, lowering network overhead while maintaining efficient data distribution to all devices.