EPDCCH Resource Mapping in LAA Cells for Discovery Signal Coexistence
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Solution Overview
Problem
LTE systems face challenges in efficiently using non-allocated and shared frequency bands due to design assumptions based on allocated frequency bands, leading to suboptimal performance and higher latency in radio communication.
Innovation Solution
A terminal device and base station device communication method that efficiently manages cell operations across allocated, non-allocated, and shared frequency bands by employing advanced scheduling and reference signal configurations, such as partial subframes and enhanced physical channels, to improve transmission efficiency and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE systems use non-allocated or shared frequency bands, then frequency band utilization is improved, but communication reliability deteriorates due to design assumptions based on allocated frequency bands
Solution Approach 1:
The patent changes key parameters including adding discovery signals for channel estimation, modifying reference signal configurations, and adjusting scheduling parameters to enable reliable communication in non-allocated and shared frequency bands while maintaining LTE performance requirements
Solution Approach 2:
Discovery signals are introduced as intermediary elements to facilitate channel estimation and communication in shared frequency bands. These signals act as mediators between the LTE system and the non-traditional frequency bands, enabling reliable communication despite different channel conditions
2Adaptability or versatility
If LTE systems use non-allocated or shared frequency bands, then frequency band utilization is improved, but latency in radio communication increases
Solution Approach 1:
The patent implements dynamic scheduling and flexible resource allocation that adapts to the specific conditions of non-allocated and shared frequency bands, optimizing transmission timing and resource assignment to reduce latency while maintaining reliable communication
Solution Approach 2:
Scheduling parameters and resource allocation configurations are optimized and adjusted specifically for non-allocated and shared frequency bands to minimize communication latency and improve time efficiency
3Adaptability or versatility
If LTE systems use non-allocated or shared frequency bands, then frequency band utilization is improved, but communication efficiency deteriorates
Solution Approach 1:
The patent optimizes multiple parameters including reference signal configurations, scheduling parameters, and resource allocation settings to maximize communication efficiency in non-allocated and shared frequency bands, transforming them from suboptimal to highly efficient operations
Solution Approach 2:
Channel estimation using discovery signals is performed in advance to prepare for efficient data transmission. This preliminary channel characterization enables optimized resource allocation and scheduling decisions that improve overall communication efficiency
Data Source
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AI summary
A cell using an allocated frequency band, a non-allocated frequency band, or a shared frequency band is controlled efficiently. A higher layer processing unit configured to configure a first configuration for monitoring an Enhanced Physical Downlink Control CHannel (EPDCCH) and a second configuration for measuring a Discovery Signal (DS); a reception processing unit configured to monitor a candidate of the EPDCCH, based on the first configuration; and a detection unit configured to detect the DS in a prescribed subframe to be determined, based on the second configuration are provided. In a case that simultaneous transmissions on the EPDCCH and the DS occur in a Licensed Assisted Access (LAA) cell, the EPDCCH is mapped onto a resource element different from a resource element corresponding to the DS in the prescribed subframe.