D2D Identifier Determination via Cell Signal Measurement
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Solution Overview
Problem
In wireless communication systems supporting device-to-device (D2D) communication, the lengthening of unique identifiers for user equipment (UE) leads to increased overhead, necessitating a method to determine identifiers efficiently.
Innovation Solution
A method for determining a unique identifier for a second UE based on the identifier of a cell with the highest signal strength or quality, combined with measurement information such as RSRP, RSRQ, RSSI, SNR, or SINR, and potentially using reference information from a D2D server.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unique identifiers are assigned to a large number of user equipments in D2D communication, then each UE can be uniquely identified, but the identifier length becomes longer causing increased overhead
Solution Approach 1:
The patent segments the identifier into two parts: a short D2D identifier (5 bits) for device differentiation and a cell identifier for location-based differentiation. This segmentation allows the system to achieve unique identification without requiring long identifiers, as the cell identifier is reused across different D2D communication contexts. The segmentation resolves the contradiction by maintaining uniqueness through combination of short identifiers rather than relying on a single long identifier.
Solution Approach 2:
The patent introduces a cell identifier as an intermediary element that works in conjunction with the D2D identifier. The cell identifier acts as a mediator that provides location context, allowing the same D2D identifier to be uniquely identified across different cells. This intermediary approach enables unique identification without increasing the length of the core D2D identifier, thus reducing overhead while maintaining reliability.
2Loss of information
If limited D2D identifiers are reused in time or spatial units, then overhead is reduced, but identifier uniqueness may be compromised
Solution Approach 1:
The patent adds a spatial dimension by incorporating the cell identifier, which identifies the geographical or logical cell where the D2D communication occurs. By moving from a single-dimensional identifier to a two-dimensional structure (D2D identifier + cell identifier), the system achieves unique identification while reusing short D2D identifiers. This dimensional expansion resolves the contradiction by providing uniqueness through multiple dimensions rather than increasing identifier length in a single dimension.
Solution Approach 2:
The patent performs preliminary action by assigning D2D identifiers and cell identifiers before establishing the complete identification context. The cell identifier is determined based on signal strength measurements from cellular base stations, and this preliminary identification enables subsequent unique D2D identifier assignment. This preliminary action ensures that when identifiers are reused, the context is already established to maintain uniqueness, thus reducing overhead without compromising reliability.
Data Source
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AI summary
The present invention discloses a method for determining a user equipment identifier in a wireless communication system supporting Device-to-Device (D2D) communication; and an apparatus for the method. More specifically, a method for determining an identifier of a UE in a wireless communication system supporting D2D communication comprises receiving, a first UE, a D2D signal including a D2D identifier from a second UE; and determining, the first UE, an identifier of the second UE on the basis of the received D2D identifier and measurement information of a cellular signal and/or information about resources in which the D2D signal is received.