D2D Discovery Signal Segmentation for Reduced Blind Decoding
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Solution Overview
Problem
Current D2D communication systems face challenges in transmitting discovery signals efficiently, leading to increased blind decoding burdens for user equipment (UE) due to limited information capacity in legacy discovery signals.
Innovation Solution
The method involves transmitting an extended discovery signal by configuring a separate resource pool for discovery messages, using a new format that allows for additional bits in the discovery message, and employing distinct CRC masking, DMRS, and MCS configurations to differentiate discovery signals from data signals, thereby reducing the blind decoding burden on UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If legacy discovery signal format is used, then device complexity is reduced, but information capacity is limited
Solution Approach 1:
The discovery signal is segmented into multiple parts: a first discovery signal transmitted on PSCCH with basic information, and a second discovery signal transmitted on PSSCH with additional information. This segmentation allows the system to transmit more information overall while keeping each individual signal format manageable and recognizable, thus increasing information capacity without excessively increasing device complexity.
Solution Approach 2:
The invention adds a temporal dimension to discovery signal transmission by using multiple transmission opportunities (first and second discovery signals at different times). This allows information to be extended across time dimensions rather than being constrained to a single signal format, effectively increasing information capacity while maintaining compatibility with existing signal processing capabilities.
2Loss of information
If discovery message size is increased, then information capacity is improved, but blind decoding burden increases
Solution Approach 1:
The discovery message is segmented into two parts transmitted separately: basic discovery information in the first signal and additional discovery information in the second signal. This segmentation reduces the blind decoding burden by allowing UEs to process smaller, more manageable message segments independently rather than attempting to decode a single large message, while still delivering comprehensive information overall.
Solution Approach 2:
The first discovery signal is transmitted preliminarily to provide basic discovery information and resource allocation details. This preliminary action allows receiving UEs to prepare for subsequent reception of additional information in the second signal, reducing the need for extensive blind decoding by providing advance guidance about message structure and resources.
3Reliability
If separate resource pool is configured, then signal differentiation is improved, but resource allocation complexity increases
Solution Approach 1:
Resources are segmented into separate pools: one pool for transmitting the first discovery signal on PSCCH and another pool for transmitting the second discovery signal on PSSCH. This resource segmentation improves signal differentiation by clearly separating the purposes and characteristics of different discovery signals, while the structured pool configuration manages complexity through organized resource management rather than ad-hoc allocation.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3~4
AI summary
An embodiment of the present invention relates to a method by which a terminal transmits a discovery signal in a wireless communication system, comprising the steps of: determining a subframe pool for data transmission; determining a subframe set for transmitting a D2D signal by applying a time resource pattern (TRP) bitmap to the subframe pool for the data transmission; and transmitting a discovery message in a subframe corresponding to the n number of bits of the TRP bitmap.