Distributed Antenna Unit Digital Interface for Sidelink Signal Decoding
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Solution Overview
Problem
The complexity of distributed antenna units (DUs) increases due to existing analog interfaces in wireless communication systems, leading to cabling loss, and there is a need to minimize this complexity while optimizing latency in feedback signal transmission.
Innovation Solution
A method is introduced where the decoding function of the physical layer is distributed between DUs and central antenna units (CUs) through a digital interface, allowing for the configuration of a time gap in feedback signal transmission to account for latency errors, and information such as resource allocation and demodulation reference signals are shared between DUs and CUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog interfaces are used in distributed antenna units, then signal transmission is enabled, but device complexity and cabling loss increase
Solution Approach 1:
The patent replaces analog interfaces with digital interfaces in the distributed antenna unit. Specifically, the DU is configured to obtain resource allocation information and demodulation reference signal information through digital signaling rather than analog connections, thereby reducing device complexity and cabling loss while maintaining signal transmission capability
Solution Approach 2:
The patent introduces a digital interface as an intermediary between the DU and CU. The DU obtains necessary information (resource allocation, demodulation reference signals) through this digital interface, which acts as a mediator to enable signal transmission while reducing the complexity of direct analog connections
2Device complexity
If decoding function is centralized in CU, then DU complexity is reduced, but latency in feedback signal transmission increases
Solution Approach 1:
The patent applies preliminary action by having the DU obtain resource allocation information and demodulation reference signal information in advance through the digital interface before actual signal transmission. This preparation allows the DU to process feedback signals more efficiently, reducing latency despite the centralized decoding function in the CU
Solution Approach 2:
The patent introduces dynamic timing gap configuration to accommodate latency. The time gap between signal transmission and feedback reception is dynamically adjusted based on the processing capability of the CU and the latency introduced by the digital interface, allowing the system to adapt to varying conditions and minimize time loss
3Loss of energy
If digital interface is used for information exchange, then cabling loss is minimized, but latency errors occur in feedback signal transmission
Solution Approach 1:
The patent implements feedback mechanisms where the DU obtains resource allocation and demodulation reference signal information through the digital interface, and the system adjusts timing gaps based on observed latency. This feedback loop allows the system to compensate for latency errors introduced by the digital interface while maintaining the energy efficiency benefits of digital signaling
Data Source
AI summary
Disclosed are a method and a device in which a terminal receives a signal by using at least one distributed antenna unit (DU) and a center antenna unit (CU) controlling the at least one distributed antenna unit in a wireless communication system supporting a sidelink according to various embodiments. Disclosed are a method and a device therefor, the method comprising the steps of: receiving a first signal and a second signal by using at least one DU; transferring first information, which is decoding information for the first signal, from the at least one DU to the CU through a first interface; and decoding the second signal on the basis of the first information by using the CU, wherein a feedback signal for the second signal is transmitted on the basis of a time gap configured for the second signal, and the time gap is configured in consideration of a time error or a time delay related to the first interface.