NR V2X AGC Preamble Scheduling for Short Symbol Reception
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Solution Overview
Problem
The existing 5G communication systems face challenges in efficiently performing automatic gain control (AGC) for vehicle-to-everything (V2X) communication, particularly due to factors like short symbol lengths with wide subcarrier spacing, long AGC settling times for high modulation rates, flexible scheduling, and short transmission time intervals, which affect reception performance and efficiency.
Innovation Solution
A method is introduced for efficiently performing AGC in NR V2X sidelink communication systems by configuring a preamble for AGC, inserting it into a previous symbol, and optimizing the position of reference signals, considering subcarrier spacing and scheduling to minimize AGC settling time and maintain reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a preamble for AGC is transmitted in V2X communication, then AGC performance is improved, but transmission time and resource overhead increase
Solution Approach 1:
The patent combines the AGC preamble transmission with existing V2X communication resources by utilizing unused time-frequency resources within the same transmission frame. Instead of allocating separate dedicated resources for AGC preamble, the system merges the AGC function with existing control or data channel structures, allowing simultaneous AGC calibration and data transmission without increasing overall transmission time.
Solution Approach 2:
The patent implements partial AGC preamble transmission by sending only the essential portion of the preamble required for gain control. Rather than transmitting a complete traditional preamble structure, the system transmits a reduced version that provides sufficient information for AGC settling while minimizing time consumption and resource usage.
2Productivity
If wide subcarrier spacing is used in V2X communication, then transmission efficiency is improved, but symbol length becomes short affecting AGC settling
Solution Approach 1:
The patent compensates for the short symbol duration caused by wide subcarrier spacing by extending the AGC preamble into the time dimension across multiple symbols or frames. Instead of relying on a single long symbol, the system distributes the AGC calibration process across several shorter symbols, accumulating sufficient settling time while maintaining the high transmission efficiency benefits of wide subcarrier spacing.
Solution Approach 2:
The patent performs AGC calibration in advance during dedicated preamble symbols before the actual data transmission begins. By completing the AGC settling process preliminarily using the inserted preamble, the system ensures that the receiver is fully calibrated before receiving data, thereby eliminating the need to extend data symbols for AGC purposes and preserving transmission efficiency.
3Productivity
If high modulation rates are used in V2X communication, then data rate is improved, but AGC settling time increases
Solution Approach 1:
The patent performs AGC calibration in advance during dedicated preamble symbols before the actual high-rate data transmission begins. By completing the AGC settling process preliminarily using the inserted preamble, the system ensures that the receiver is fully calibrated before receiving data, thereby eliminating the need to extend data symbols for AGC purposes and preserving transmission efficiency.
Solution Approach 2:
The patent segments the transmission structure into distinct functional parts: an initial AGC preamble segment followed by the high-rate data segment. This segmentation allows the AGC function to be isolated and completed independently during the preamble phase, enabling the subsequent data phase to operate at full modulation rate without being constrained by AGC settling requirements.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method by a first terminal in a wireless communication system is provided. The method includes determining whether to transmit a preamble for an automatic gain control (AGC), determining a slot and at least one symbol in the slot to transmit the preamble for the AGC, in a case in which it is determined to transmit the preamble for the AGC, and transmitting, to a second terminal, the preamble for the AGC in the determined slot and the at least one symbol in the slot.