Dynamic Transmission Set Indication for LTE-Advanced Signaling Overhead
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Solution Overview
Problem
Current cellular network technologies face challenges in deciding between single cell transmission (SiC) and coordinated multipoint transmission (CoMP) modes, leading to inadequate operations and increased signaling overhead, particularly in LTE-Advanced networks, due to the need for fast communication between base stations and limited feedback information.
Innovation Solution
Implementing dynamic transmission set assignment mechanisms that allow terminals to select and feedback the optimal transmission set definition, which defines the number of cells for data transmission, using CSI feedback for both SiC and CoMP modes, reducing signaling overhead by only reporting the best transmission set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CoMP operation is implemented between multiple base stations, then transmission diversity and reliability are improved, but communication delay increases due to the requirement for very fast communication between cooperating base stations
Solution Approach 1:
The invention segments the CoMP operation into two distinct modes: intra-eNB CoMP (within the same base station) and inter-eNB CoMP (between different base stations). This segmentation allows the system to choose the appropriate mode based on terminal location and channel conditions, thereby achieving transmission diversity while avoiding the communication delay issues associated with inter-eNB coordination.
Solution Approach 2:
The invention performs preliminary configuration of multiple transmission sets (including both intra-eNB and inter-eNB CoMP sets) before actual data transmission. The network pre-configures the terminal with multiple candidate transmission sets, and the terminal provides feedback indicating its preference. This preliminary action enables fast switching between modes without requiring real-time coordination delays.
2Device complexity
If the network decides on transmission mode (SiC or CoMP) blindly without terminal feedback, then device complexity is reduced, but transmission reliability deteriorates due to inadequate decisions
Solution Approach 1:
The invention introduces a feedback mechanism where the terminal evaluates multiple pre-configured transmission sets and provides feedback indicating its preferred transmission set. The terminal's feedback is based on its channel state knowledge and reception capability. This feedback enables the network to make informed transmission mode decisions, improving reliability while maintaining manageable complexity through standardized feedback procedures.
3Reliability
If joint feedback for both SiC and CoMP modes is required, then transmission reliability is improved, but signaling overhead increases due to the amount of information to be fed back
Solution Approach 1:
The invention extracts only the essential feedback information needed for transmission mode selection. Instead of requiring full joint feedback for both SiC and CoMP modes, the terminal provides feedback indicating its preferred transmission set from the pre-configured options. The network then assigns resources based on this condensed feedback, significantly reducing signaling overhead while maintaining transmission reliability.
4Adaptability or versatility
If multiple transmission set definitions are configured for terminal, then adaptability is improved, but device complexity increases due to the need to process and select among multiple definitions
Solution Approach 1:
The network performs preliminary configuration of multiple transmission sets with different characteristics (intra-eNB CoMP, inter-eNB CoMP, SiC) before actual transmission. The terminal stores these pre-configured sets and their associated parameters. During operation, the terminal simply selects from the pre-configured options based on channel conditions and provides feedback, avoiding the complexity of dynamically creating and evaluating multiple transmission set definitions in real-time.
Data Source
AI summary
The present invention proposes methods and apparatuses and computer program products for dynamic transmission set indication in scenarios in which a terminal is enabled for single cell transmission SiC as well as for coordinated multipoint transmission CoMP. To this extent, appropriate information is being fed back from the terminal to the base station via feedback signaling channels. The decision on which transmission mode defined by respective transmission set definitions is used can be taken by the terminal or, in a modified scenario, by the base station, based on the information fed back.