D2D Signal Detection Using Segmented Physical Layer Identifiers
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Solution Overview
Problem
In D2D communication, efficiently detecting a signal addressed to a user apparatus while minimizing overhead is challenging, especially when out of cellular coverage, as existing methods increase power consumption and overhead by transmitting multiple IDs.
Innovation Solution
A user apparatus transmits a signal including a physical layer identifier associated with an upper layer identifier, allowing efficient detection of the intended signal by using the physical layer identifier from the received signal, thereby reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If only MAC ID is transmitted, then overhead amount is reduced, but user apparatus cannot detect addressed signal without decoding PHY data, increasing power consumption
Solution Approach 1:
The identifier is segmented into two parts: a first identifier (e.g., 16 bits) transmitted in the PHY layer for quick power-saving detection, and a second identifier (e.g., 24 bits) transmitted in the MAC layer for complete signal identification. This segmentation allows the receiver to perform low-power detection using only the first identifier while maintaining accurate signal identification capability.
Solution Approach 2:
Instead of transmitting the complete identifier in the PHY layer, only a partial identifier (first identifier) is transmitted for detection purposes. This partial action enables power-saving detection without requiring full identifier transmission, reducing overhead while maintaining detection capability.
2Productivity
If PHY ID and MAC ID are both transmitted, then signal detection efficiency is improved, but overhead amount increases
Solution Approach 1:
The identifier is divided into a first identifier for PHY layer transmission and a second identifier for MAC layer transmission. The first identifier enables efficient power-saving detection, while the second identifier provides complete identification. This segmentation achieves efficient signal detection without transmitting redundant full identifiers in both layers.
Solution Approach 2:
The first and second identifiers are merged to form a complete identifier system. The first identifier (e.g., 16 bits) and second identifier (e.g., 24 bits) together provide the full identification capability, allowing the system to achieve both power-saving detection and complete signal identification without transmitting excessive overhead.
3Ease of operation
If complete identifier is transmitted in PHY layer, then signal detection is simplified, but overhead amount increases
Solution Approach 1:
The complete identifier is segmented into a first identifier for PHY layer transmission and a second identifier for MAC layer transmission. This segmentation simplifies detection at the PHY layer using the first identifier while avoiding the overhead of transmitting the complete identifier in both layers, achieving a balance between detection simplicity and overhead reduction.
Data Source
AI summary
A user apparatus is described that performs D2D communication by radio, including a signal reception unit configured to detect a signal addressed to the user apparatus by detecting an identifier of a physical layer of the user apparatus that is associated with an identifier of an upper layer of the user apparatus from a signal received by radio. The signal reception unit further detects data of the upper layer addressed to the user apparatus by using the identifier of the physical layer of the user apparatus as a part of the identifier of the upper layer of the user apparatus.