LTE D2D Resource Allocation via UE State Flags
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Solution Overview
Problem
Current Long Term Evolution (LTE) device-to-device communication systems face challenges in efficiently managing resource allocation for device-to-device (D2D) communication, particularly in determining available resources and transitioning between idle and connected states, which affects D2D communication support and resource utilization.
Innovation Solution
The solution involves a method where user equipment (UE) sets flags based on system information received for D2D communication, with different flags indicating whether a request for resource allocation is required or if D2D communication is supported, allowing the UE to determine and allocate D2D resources appropriately by interacting with higher layers such as the ProSe protocol and RRC layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE determines D2D resources based on system information and flags, then resource allocation efficiency is improved, but the complexity of resource management increases
Solution Approach 1:
The patent segments the resource determination process into distinct components: system information reception, flag setting based on RRC state and resource availability, and conditional resource selection. This segmentation allows each component to be independently managed and processed, improving efficiency while maintaining manageable complexity through structured decision-making flow
Solution Approach 2:
The patent implements preliminary action by pre-configuring flags in the RRC layer based on system information before the upper layers (ProSe protocol) need to determine D2D resources. This advance preparation of resource allocation parameters enables faster resource determination when needed, improving overall allocation efficiency without adding runtime complexity
2Measurement precision
If the UE transitions between idle and connected states to allocate D2D resources, then resource allocation accuracy is improved, but communication delay increases
Solution Approach 1:
The patent implements dynamics by making the resource allocation approach adaptive to the UE's current RRC state. When in connected state, the UE uses network-configured resources for accurate allocation. When in idle state, the UE autonomously determines resources from system information. This dynamic adaptation eliminates unnecessary state transitions, reducing delay while maintaining allocation accuracy through state-appropriate methods
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously determine and allocate D2D resources directly from system information when in idle state, without requiring network intervention or state transition. The UE's RRC layer independently sets flags and determines resources based on available system information, eliminating communication delay while maintaining reasonable allocation accuracy through self-contained decision-making
Data Source
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AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE determines whether system information is received for D2D communication. In addition, the UE sets at least one flag based on the system information when the system information is received. Further, the UE determines D2D resources based on the at least one flag.