Network Device Feedback Processing for ABS and Non-ABS Slots
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Legacy communication devices are unable to distinguish between Almost Blank Subframes (ABS) and non-ABSs, leading to inaccurate Channel Quality Indicators (CQI) and reduced cell range expansion, resulting in suboptimal communication link parameters and interference issues in heterogeneous networks.
Innovation Solution
A method to determine the type of transmission slot, such as ABS or non-ABS, in received feedback, allowing for separate storage and use of communication link parameters like modulation type, coding scheme, and Multiple-Input-Multiple-Output Mode, correcting channel quality indications and improving link adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy communication devices are used in heterogeneous networks, then device compatibility is maintained, but channel quality indication accuracy deteriorates due to inability to distinguish between ABS and non-ABS transmission slots
Solution Approach 1:
The patent segments the feedback information by creating separate storage locations for CQI values corresponding to ABS and non-ABS transmission slots. The network device determines the transmission slot type and stores feedback in different locations accordingly, allowing legacy devices to provide unified feedback while the system processes it as differentiated data for accurate link adaptation.
2Manufacturing precision
If separate feedback processing for ABS and non-ABS is implemented, then link adaptation accuracy is improved, but device complexity increases due to additional determination and storage operations
Solution Approach 1:
The patent applies preliminary action by determining the transmission slot type (ABS or non-ABS) before storing the feedback information. The network device identifies the slot type in advance and directs the feedback to the appropriate storage location, which simplifies the overall process compared to post-processing differentiation and enables accurate link adaptation without complex real-time analysis.
3Area of stationary object
If cell range expansion is increased in heterogeneous networks, then network coverage is improved, but interference from macro cells to small cells increases
Solution Approach 1:
The patent applies local quality by enabling different communication link parameters to be used for different transmission slot types. The system can apply aggressive link adaptation and higher order modulation schemes specifically during ABS slots where interference is reduced, while using more conservative parameters during non-ABS slots. This allows the small cell to effectively expand its coverage area by providing reliable service during low-interference periods without being constrained by the average interference conditions.
Data Source
AI summary
A method and apparatus relating to feedback in a communication system. The method includes receiving feedback relating to a transmission slot; and subsequently determining the type of transmission slot the feedback relates to.