EPDCCH TPR Grouping for Interference Suppression
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Solution Overview
Problem
Unlimited traffic-to-pilot ratio (TPR) variations across resource elements of a physical resource block (PRB) pair in LTE communication systems hinder the ability of user equipment (UE) to perform inter-cell/intra-cell interference suppression and interference cancellation for the enhanced physical downlink control channel (EPDCCH), necessitating a TPR limitation to facilitate effective management.
Innovation Solution
The method involves identifying resource elements within a PRB pair for control channel transmission, dividing them into groups, and restricting resource elements within each group to a consistent TPR, ensuring uniform TPR across resource elements within an enhanced resource element group (EREG) or enhanced control channel element (ECCE) to facilitate interference suppression and cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unlimited TPR variations are allowed across resource elements of a PRB pair, then flexibility in EPDCCH transmission is improved, but interference suppression and cancellation capabilities deteriorate
Solution Approach 1:
The patent applies local quality by allowing different TPR values for different groups of resource elements (EREGs or ECCEs) while maintaining uniform TPR within each group. This enables localized adaptation to different channel conditions and interference scenarios while preserving the reliability needed for interference suppression within each group boundary.
Solution Approach 2:
The patent segments the resource elements into groups (EREGs or ECCEs) and applies TPR restriction within each group. This segmentation allows the system to balance flexibility (by having multiple groups with potentially different TPR values) and reliability (by maintaining uniform TPR within each group for proper interference suppression).
2Reliability
If TPR is restricted to be uniform across all resource elements, then interference suppression capabilities are improved, but flexibility in resource allocation deteriorates
Solution Approach 1:
The patent allows different TPR values for different groups of resource elements (EREGs or ECCEs), enabling local adaptation to varying channel conditions and traffic requirements. Each group can be optimized independently while maintaining uniform TPR within the group for reliable interference suppression.
Solution Approach 2:
By segmenting resource elements into groups and applying TPR restriction at the group level rather than individually or uniformly across all elements, the patent achieves a balance between reliability (uniform TPR within groups) and flexibility (different TPR values across groups).
Data Source
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AI summary
For an enhanced physical downlink control channel (EPDCCH), unlimited traffic-to-pilot ratio (TPR) variations across resource elements of a physical resource block (PRB) pair is problematic because of the detrimental affect the variations will have on the ability of a user equipment (UE) to perform inter-cell/intra-cell interference suppression (IS) and/or interference cancellation (IC) on EPDCCH of an interfering cell. A TPR limitation is placed on EPDCCH to facilitate IS/IC without causing practical limitations on EPDCCH management by an eNB. Accordingly, a method, an apparatus, and a computer program product for wireless communication are provided. The apparatus identifies a plurality of resource elements of at least one PRB pair for transmitting one or more control channels, divides the plurality of identified resource elements into one or more groups, and restricts a plurality of resource elements in a respective group to a TPR.