D2D Discovery Signal CRC Masking for Relay UE Identification
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Solution Overview
Problem
In device-to-device (D2D) communication, existing systems lack an effective method to distinguish between user equipment (UEs) that transmit signals, particularly in identifying relay UEs and differentiating between public safety and non-public safety signals, which hinders efficient network management and signal processing.
Innovation Solution
A method where a UE receives a discovery signal, checks its CRC, and identifies if at least part of the CRC is masked with a predetermined sequence to determine the type of UE, such as a relay UE, using backhaul link quality information for selection, and differentiates between signal configurations based on CRC masking, including XOR operations with RNTI and synchronization source IDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is introduced to reduce eNB overhead, then network efficiency and data transmission rates improve, but the ability to distinguish and manage different UE types (relay UE vs. normal UE) deteriorates
Solution Approach 1:
The patent segments the discovery signal structure by introducing different CRC masking patterns for different UE types. Normal UEs use one masking pattern while relay UEs use another, allowing receiving UEs to distinguish between UE types by checking the CRC masking pattern without requiring separate signaling channels or complex identification protocols.
Solution Approach 2:
The patent applies local quality by modifying only the CRC portion of the discovery signal with UE-type-specific masking sequences, while keeping the rest of the discovery signal structure unchanged. This localized modification enables UE type identification without redesigning the entire discovery signal framework.
2Area of stationary object
If relay UEs are introduced to extend cell coverage, then network coverage and accommodation capability improve, but the complexity of signal processing and UE identification increases
Solution Approach 1:
The patent segments the identification process by using distinct CRC masking patterns for relay UEs versus normal UEs. This segmentation allows receiving UEs to quickly identify relay UEs through simple CRC checking without requiring complex signal analysis or additional processing stages.
Solution Approach 2:
The patent implements self-service by enabling UEs to automatically identify relay UEs through the CRC masking pattern embedded in the discovery signal itself. The identification information is inherently contained within the signal structure, eliminating the need for separate identification signaling or complex handshaking protocols.
3Reliability
If public safety signal differentiation is implemented, then signal prioritization and network management improve, but the complexity of CRC masking configurations increases
Solution Approach 1:
The patent segments the CRC masking approach by assigning specific masking patterns to different UE types and signal priorities. Public safety signals use distinct masking patterns from normal signals, enabling receiving UEs to prioritize processing based on the masking pattern detected during CRC verification.
Solution Approach 2:
The patent applies local quality by modifying only the necessary portions of the CRC with UE-type and signal-priority-specific masking sequences. This localized approach enables differentiated signal handling without requiring complete reconfiguration of the CRC structure or additional complex encoding schemes.
Data Source
AI summary
An embodiment of the present invention relates to a method for transmitting/receiving a signal by a device-to-device (D2D) UE in a wireless communication system, the method comprising the steps of: receiving a discovery signal; and checking a CRC of the discovery signal wherein when at least a part of the CRC is masked by a preconfigured sequence, the UE acquires, from the discovery signal, backhaul link quality information of an apparatus which has transmitted the discovery signal.