Grant-Free Wireless Reception with SPS and Data Indication Signals
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Solution Overview
Problem
Existing wireless communication systems face challenges in seamlessly providing various services, particularly in IoT environments, due to the need for efficient grant-free data transmission and reception methods that can support diverse service requirements such as eMBB, mMTC, and URLLC in 5G communication systems.
Innovation Solution
Implementing grant-free reception and transmission methods involving configuration of downlink semi-persistent scheduling (SPS) and data indication signals (DIS) between terminals and base stations, allowing terminals to monitor data channels based on activation indications and adjust monitoring accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grant-based scheduling is used for data transmission, then reliability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the scheduling process into two parts: semi-persistent scheduling (SPS) for periodic traffic patterns and dynamic scheduling for aperiodic traffic. This segmentation allows the system to use simplified grant-free transmission for predictable traffic while maintaining grant-based scheduling for unpredictable traffic, thereby reducing overall complexity while preserving reliability.
Solution Approach 2:
The patent implements preliminary action by configuring semi-persistent scheduling in advance for periodic traffic flows. The SPS configuration includes pre-defining resource allocations, modulation and coding schemes, and transmission parameters, eliminating the need for continuous grant requests and responses for periodic traffic, thus reducing signaling overhead and device complexity.
2Device complexity
If grant-free transmission is implemented, then device complexity is reduced, but reliability deteriorates
Solution Approach 1:
The patent applies dynamics by making the transmission mode flexible and adaptive. The system dynamically switches between grant-free semi-persistent scheduling and grant-based scheduling based on traffic characteristics, channel conditions, and service requirements. This dynamic approach allows the system to optimize between complexity and reliability in real-time.
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors the performance of semi-persistent scheduling and can send activation, deactivation, or reconfiguration commands to adjust the SPS parameters. This feedback loop ensures that reliability is maintained by adapting the grant-free transmission parameters based on actual system performance and changing traffic patterns.
3Reliability
If monitoring of downlink control channel is continuous, then data reception reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by configuring semi-persistent scheduling with specific periodicity for monitoring downlink data channels. Instead of continuous monitoring, the terminal monitors only at predetermined intervals based on the SPS configuration, significantly reducing energy consumption while maintaining reliable reception of periodic data transmissions.
Solution Approach 2:
The terminal uses self-service by autonomously determining when to monitor the downlink based on the pre-configured SPS parameters received from the base station. The terminal independently manages its monitoring schedule without requiring continuous control channel commands, reducing energy consumption while ensuring reliable data reception according to the configured pattern.
Data Source
AI summary
The present disclosure relates to a method and apparatus for performing grant-free transmission and reception in a wireless communication system, and a grant-free reception method performed by a terminal in a mobile communication system according to an embodiment of the disclosure includes receiving, from a base station, configuration information related to downlink semi-persistent scheduling (SPS) and configuration information related to a data indication signal (DIS), receiving, from the base station, downlink SPS activation indication information, monitoring the DIS based on the configuration information related to the DIS, and when the DIS is detected or when the DIS is detected and monitoring indication information for a downlink data channel is obtained from the DIS, monitoring the downlink data channel based on at least one of the configuration related to downlink SPS and the downlink SPS activation indication information.