Inter-frequency D2D Configuration via Segmented SIBs
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Solution Overview
Problem
Current wireless communication systems face challenges in managing inter-frequency Device-to-Device (D2D) settings, leading to frequent unnecessary updates and the use of invalid settings, particularly in public safety networks, which affects system efficiency and reliability.
Innovation Solution
A method where a user equipment (UE) receives a first system information block with inter-frequency D2D configuration and validity duration, allowing it to perform D2D operations only within the valid timeframe, thereby preventing unnecessary updates and ensuring valid settings are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current system information block acquisition procedure is used to notify terminals of any system information update via paging, then system information updates can be communicated to all terminals, but frequent updates occur when inter-frequency D2D settings change, causing significant system influence and unnecessary terminal operations
Solution Approach 1:
The patent segments system information blocks into different types: SIB17 for intra-frequency D2D settings and SIB19 for inter-frequency D2D settings. This segmentation allows selective updating and notification only when relevant information changes, preventing unnecessary system-wide paging notifications when only inter-frequency D2D settings are modified.
Solution Approach 2:
The patent introduces a frequency indicator field in SIB17 that specifies whether the intra-frequency D2D settings apply to the serving cell frequency or a non-serving cell frequency. This local quality differentiation enables terminals to efficiently determine applicability without processing entire system information blocks, reducing unnecessary updates and improving system efficiency.
2Adaptability or versatility
If system information blocks containing inter-frequency D2D settings are frequently updated, then terminals can have access to the latest configuration information, but terminals must unnecessarily receive paging messages even for information they are not interested in, increasing power consumption and processing overhead
Solution Approach 1:
The patent separates intra-frequency and inter-frequency D2D settings into different system information blocks (SIB17 and SIB19 respectively). Terminals can selectively acquire and process only the relevant SIB based on their operational needs, avoiding unnecessary processing of unrelated system information updates and reducing power consumption.
Solution Approach 2:
The patent includes a frequency indicator field in SIB17 that provides preliminary information about the applicability of D2D settings before full processing. Terminals can use this indicator to quickly determine whether to proceed with acquiring and processing the complete system information block, avoiding unnecessary processing time and power consumption.
3Ease of manufacture
If modification periods of cells within different frequencies are different or boundaries occur at different timings, then each cell can be optimized independently, but D2D setting updates may be synchronized to UEs of other cells, resulting in invalid D2D settings being used
Solution Approach 1:
The patent introduces a frequency indicator as an intermediary element in SIB17 that mediates between different cell configurations and frequencies. This indicator provides a reference mechanism that helps terminals correctly interpret and apply D2D settings across different frequencies and modification periods, ensuring validity even when cells are optimized independently.
Data Source
AI summary
The present invention provides a device-to-device (D2D) operation method performed by a terminal in a wireless communication system, said method involving receiving a first system information block that contains an inter-frequency D2D setting, receiving information that indicates the effective time of the inter-frequency D2D setting, and performing inter-frequency D2D on the basis of the inter-frequency D2D setting and the information that indicates the effective time.