EPDCCH Candidate Determination in Wireless Networks
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Solution Overview
Problem
Current methods for determining enhanced physical downlink control channel candidates in wireless communication networks are inefficient, particularly in utilizing frequency domain resources, leading to suboptimal resource allocation and potential blocking of localized EPDCCH candidates by distributed EPDCCH candidates.
Innovation Solution
The solution involves configuring EPDCCH candidates by spreading them across PRB-pairs and localized ECCEs, using a search space equation to determine both localized and distributed EPDCCH candidates, ensuring efficient resource utilization and minimizing blocking by mapping candidates across different ECCEs and PRB-pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed EPDCCH candidates are determined using conventional methods, then frequency domain resource utilization is improved, but localized EPDCCH candidates are blocked by distributed EPDCCH candidates
Solution Approach 1:
The patent segments the control channel resources by separating localized ECCEs and distributed ECCEs into distinct sets. The search space determination is segmented to first identify localized ECCEs, then determine distributed ECCEs from remaining resources, preventing overlap and blocking between the two types of candidates
Solution Approach 2:
The patent introduces a hierarchical dimension to the search space determination process. Instead of treating all ECCEs equally, it creates a two-level structure where localized ECCEs are determined first at the primary level, and distributed ECCEs are determined second at the distributed level from remaining resources, adding temporal sequencing to the resource allocation
2Device complexity
If conventional search space determination is used, then implementation simplicity is maintained, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by first determining the localized search space and identifying localized ECCEs before determining the distributed search space. This preliminary determination of localized candidates ensures that distributed candidates are subsequently allocated from remaining resources, optimizing overall resource utilization without requiring complex simultaneous optimization
Data Source
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AI summary
In embodiments, an evolved Node B (eNB) of a wireless communication network may configure an enhanced physical downlink control channel (EPDCCH) physical resource block (PRB) set for a user equipment (UE). The EPDCCH-PRB set may include a plurality of PRB-pairs. The EPDCCH-PRB set may further include a plurality of enhanced resource element groups (EREGs) organized into localized enhanced control channel elements (ECCEs) having EREGs of the same PRB-pair and distributed ECCEs having EREGs of different PRB-pairs. In some embodiments, the eNB may determine a set of distributed EPDCCH candidates for the UE from the EPDCCH-PRB set, wherein the individual distributed EPDCCH candidates include one or more of the distributed ECCEs, and wherein the set of distributed EPDCCH candidates includes at least one EREG from each of the plurality of localized ECCEs. Other embodiments may be described and claimed.