PDCCH Small Data Reception for RRC Idle and Inactive Terminals
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Solution Overview
Problem
Existing communication systems face challenges in efficiently transmitting and receiving small data packets in high-frequency bands, particularly in millimeter wave frequencies, due to the need for methods that support intermittent data transmission and reception without transitioning the terminal from an RRC idle or inactive state.
Innovation Solution
The method involves generating an indicator for small data transmission using DCI scrambled with P-RNTI or SM-RNTI, configuring a transmission window, and utilizing HARQ responses within a defined reception window, allowing terminals to receive small data without changing their RRC state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal transitions to RRC connected state to receive small data, then the data transmission can be performed, but the latency and resource overhead increase
Solution Approach 1:
The terminal performs monitoring of PDCCH in RRC idle or inactive states to detect small data transmission opportunities before transitioning to connected state. This preliminary monitoring action enables the terminal to quickly detect and receive small data without completing full state transition, thereby reducing latency and resource overhead while maintaining transmission efficiency
2Use of energy by moving object
If the terminal remains in RRC idle or inactive state to save resources, then energy consumption is reduced, but the terminal cannot receive small data efficiently
Solution Approach 1:
The terminal performs partial monitoring of PDCCH in RRC idle or inactive states rather than full connected state operations. This partial action allows the terminal to detect small data transmission indicators and receive data without the complete overhead of RRC connected state, achieving energy efficiency while maintaining small data reception capability
3Productivity
If traditional methods are used for small data transmission, then the system follows existing protocols, but the transmission efficiency and speed are insufficient
Solution Approach 1:
The base station transmits indicators in PDCCH before actual small data transmission, allowing terminals to detect transmission opportunities in advance while remaining in idle or inactive states. This preliminary indication mechanism enables faster data reception by eliminating the need for full RRC state transition, thereby improving both transmission efficiency and speed
Solution Approach 2:
PDCCH monitoring serves as an intermediary mechanism between RRC idle/inactive states and actual data reception. The terminal monitors PDCCH for transmission indicators, which mediate the transition process and enable efficient small data reception without requiring full connected state establishment, thus improving transmission speed and efficiency
Data Source
AI summary
An operation method of a base station in a communication system may include generating an indicator indicating transmission of small data; transmitting the indicator to a terminal; and transmitting the small data associated with the indicator to the terminal, wherein the terminal operates in a radio resource control (RRC) idle state or an RRC inactive state.