D2D Signal Reception Using DM RS Measurement for PSBCH Decoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
A D2D communication UE located out of a network service area may fail to decode a PSBCH due to the absence of PSBCH transmission by a D2D discovery UE, leading to unnecessary reattempts in decoding, as it is unaware whether the detected PSSS/SSSS has been transmitted.
Innovation Solution
The D2D reception UE performs DM RS measurement or energy detection to determine if PSBCH has been transmitted, and based on the results, decides whether to reattempt PSBCH decoding or switch to detecting another PSSS/SSSS, with stored synchronization identifiers aiding in this decision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a D2D reception UE attempts to decode PSBCH after detecting PSSS/SSSS, then it may successfully receive synchronization information, but it performs unnecessary reattempt operations when PSBCH was not transmitted by a D2D discovery UE
Solution Approach 1:
The patent applies preliminary action by performing energy detection on the PSBCH region before attempting decoding. This preliminary check determines whether PSBCH is actually present in the detected synchronization signal, allowing the UE to avoid futile decoding attempts and save time and resources.
2Reliability
If a D2D reception UE reattempts PSBCH decoding for a specific time or attempt number, then it may recover from transient decoding failures, but it wastes resources on futile attempts when PSBCH was never transmitted
Solution Approach 1:
The patent introduces energy detection as an intermediary mechanism between PSSS/SSSS detection and PSBCH decoding. This intermediary step provides information about the presence of PSBCH, enabling the UE to make informed decisions about whether to attempt decoding, thereby avoiding energy waste on futile operations.
3Productivity
If a D2D reception UE performs energy detection to determine PSBCH transmission, then it avoids unnecessary decoding attempts, but it increases the complexity of the signal reception process
Solution Approach 1:
The patent changes the parameter being measured from direct signal presence to energy level in the PSBCH region. By detecting energy levels and comparing them against thresholds, the system determines PSBCH presence without requiring complex decoding operations, thus improving efficiency while maintaining manageable complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure relates to a communication technique for converging IoT technology and a 5G communication system for supporting higher data transmission rate after a 4G system, and a system thereof. The present disclosure can be applied to an intelligent service (for example, a smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, and security and safety related service etc.) based on 5G communication technology and IoT related technology. The present invention relates to a signal receiving method and apparatus of a terminal in device-to-device wireless communication. In the present invention, a D2D reception terminal can measure a DM RS transmitted together with a PSBCH or detect energy with respect to the entirety of or a part of a symbol region through which the PSBCH or DM RS in a synchronization subframe can be transmitted so as to enable use as a criterion for determining whether to retry PSBCH decoding. When a DM RS measurement level or an energy detecting level is larger than a certain threshold value, the D2D reception terminal recognizes that the PSBCH has been transmitted and may retry the PSBCH decoding for a certain time or a certain number of times. When a DM RS measurement level or an energy detecting level is smaller than a certain threshold value, the D2D reception terminal recognizes that the PSBCH has not been transmitted and may not retry the PSBCH decoding. When the PSBCH decoding is not retried, the D2D reception terminal can try other PSSS/SSSS detection. Through the present invention, the D2D reception terminal can avoid inefficient operation of retrying the PSBCH decoding for a certain time or a certain number of times despite non-transmission of the PSBCH.