ABS Pattern Interpretation via DL Reference HARQ Timing
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Solution Overview
Problem
The technical challenge lies in interpreting and managing Almost Blank Subframe (ABS) information in wireless communication systems when Enhanced Interference Management and Traffic Adaptation (eIMTA) and ABS are simultaneously applied, particularly in determining the correct subframes for ABS pattern interpretation across cells with different UL/DL configurations.
Innovation Solution
A method and apparatus for receiving ABS information, where a first cell interprets ABS pattern information from a second cell by referencing the DL reference HARQ timing, adjusting the interpretation units based on the UL/DL configuration, and determining subframes for ABS, ensuring accurate ABS signaling and interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cell uses uplink subframes for downlink transmission under eIMTA, then traffic adaptability is improved, but ABS pattern interpretation complexity increases due to configuration differences
Solution Approach 1:
The patent changes the reference parameter for ABS pattern interpretation from the actual dynamic UL/DL configuration to a fixed DL reference HARQ timing configuration. This allows the ABS pattern to be interpreted consistently regardless of traffic adaptation, resolving the contradiction between adaptability and interpretation complexity
Solution Approach 2:
The patent introduces DL reference HARQ timing as an intermediary reference frame that mediates between the dynamic eIMTA configuration and the ABS pattern interpretation. This intermediary allows cells with different configurations to interpret ABS patterns consistently without directly comparing their different UL/DL configurations
2Adaptability or versatility
If cells have different UL/DL configurations, then traffic flexibility is improved, but interference coordination accuracy deteriorates due to ABS interpretation mismatches
Solution Approach 1:
The patent changes the reference configuration parameter from cell-specific dynamic UL/DL configuration to a common DL reference HARQ timing configuration. This ensures that all cells interpret ABS patterns with the same timing reference, maintaining interference coordination accuracy while allowing traffic flexibility through eIMTA
Solution Approach 2:
The patent creates homogeneity in ABS pattern interpretation by having all cells reference the same DL reference HARQ timing configuration. This homogeneous reference frame ensures consistent ABS identification across cells with different UL/DL configurations, improving interference coordination accuracy
3Ease of operation
If ABS pattern information is transmitted without configuration reference, then signaling simplicity is improved, but ABS identification accuracy deteriorates
Solution Approach 1:
The patent makes the DL reference HARQ timing configuration a universal reference that serves multiple functions: it defines the timing framework for ABS pattern interpretation, provides a common reference for interference coordination, and enables consistent configuration across cells. This universal reference maintains signaling simplicity while improving identification accuracy
Data Source
AI summary
A method of receiving, by a first cell, an almost blank subframe (ABS) in a wireless communication system, and the first cell therefore are discussed. The method according to an embodiment includes receiving an ABS pattern information element from a second cell; and determining a sub frame which the second cell uses as the ABS, from the ABS pattern information element. The first cell determines the ABS pattern information element based on the downlink (DL) reference hybrid automatic repeat request (HARQ) timing of the second cell when the second cell uses an uplink subframe for downlink transmission.