DL SPS Resource Configuration for NB-IoT Power Saving
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently receiving large amounts of downlink data, particularly in power-saving modes, such as during firmware updates, where shared downlink channels are necessary for multiple devices, leading to high power consumption and increased signaling overhead.
Innovation Solution
The method involves User Equipment (UE) receiving DL SPS configuration information in advance, allowing it to decode PDSCH on pre-configured DL SPS resources without continuously monitoring PDCCH, thereby reducing power consumption and signaling overhead during large file transfers like firmware updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE continuously monitors PDCCH to receive DL data, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The network pre-configures SPS resources (time, frequency, modulation, coding) in advance before actual data transmission. This allows the UE to enter sleep mode and wake up only at predetermined SPS occasions to receive data, eliminating continuous PDCCH monitoring while ensuring reliable data reception through pre-planned resource allocation.
Solution Approach 2:
SPS implements periodic resource allocation where the UE monitors PDCCH only at specific intervals (SPS occasions) rather than continuously. The periodic pattern is configured by the network, allowing the UE to sleep between occasions and significantly reducing power consumption while maintaining the ability to receive downlink data reliably at scheduled times.
2Adaptability or versatility
If dynamic scheduling is used for DL data transmission, then resource allocation flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the scheduling decision-making function from each individual data transmission event and consolidates it into a pre-configuring phase. The network determines and configures SPS parameters in advance, removing the need for repeated dynamic scheduling signaling for each data packet, thus reducing signaling overhead while maintaining resource allocation capability.
Solution Approach 2:
Resource allocation parameters (time resources, frequency resources, modulation and coding scheme) are determined and configured in advance by the network before actual data transmission occurs. This preliminary configuration eliminates the need for continuous dynamic scheduling signaling, reducing overhead while preserving the network's ability to allocate resources appropriately.
3Use of energy by moving object
If UE receives large amounts of DL data in RRC_IDLE mode, then power saving is improved, but device complexity increases
Solution Approach 1:
The UE is configured with autonomous SPS reception capability, allowing it to independently receive downlink data at pre-configured occasions without needing to transition to RRC_CONNECTED mode. The device self-manages its reception schedule based on configured parameters, enabling power-saving idle mode operation while receiving large data volumes without requiring complex state management.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for receiving DL data on SPS resources in wireless communication system, the device receives downlink (DL) Semi-Persistent Scheduling (SPS) configuration information, receives a paging message including an identifier related to the UE, and configures DL SPS resources based on the received DL SPS configuration information based on the paging message including information for activating of DL SPS configuration, wherein the UE receives DL data on each of the configured DL SPS resource.