eREG Mapping for ePDCCH Resource Utilization
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Solution Overview
Problem
Current wireless communication systems, such as LTE and LTE-Advanced, lack a method for efficiently transmitting control channels like ePDCCH through an enhanced resource element group (eREG) within a unit physical resource block.
Innovation Solution
The method involves determining at least one unit physical resource block for control channel transmission, dividing its resource elements into groups, and mapping the control channel based on eREG information to specific positions within each group, forming eREGs by selecting resource elements from designated positions, allowing the control channel to be transmitted effectively through these eREGs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control channels are transmitted using traditional PDCCH methods, then transmission reliability is maintained, but resource utilization efficiency deteriorates and flexibility is limited
Solution Approach 1:
The patent segments the control channel transmission by dividing resource elements into multiple groups (first group, second group, third group) with different functions. Specifically, resource elements are partitioned into DMRS ports, eREGs, and other control channels, allowing independent optimization of each segment for better resource utilization while maintaining overall system reliability
Solution Approach 2:
The patent introduces a new dimensional structure for control channel transmission by defining eREGs as a new resource organization unit within the PRB. This creates an additional layer of resource allocation dimension beyond traditional resource blocks, enabling more flexible and efficient resource utilization through the Sth position selection mechanism across multiple resource element groups
2Productivity
If resource elements are densely packed to improve spectral efficiency, then transmission capacity increases, but mapping complexity and interference management deteriorate
Solution Approach 1:
The patent applies local quality by assigning different functional characteristics to different groups of resource elements within the same PRB. The first group (DMRS ports) provides reference signaling quality, the second group (eREGs) provides control channel quality, and the third group provides additional control quality. This localized functional differentiation enables efficient spectral utilization while simplifying the mapping process through clear functional separation
Solution Approach 2:
The patent introduces eREGs as an intermediary structure between resource elements and traditional control channel elements. This intermediary layer with its specific Sth position selection mechanism acts as a mediator that organizes resource elements into manageable groups, reducing mapping complexity while maintaining high spectral efficiency through structured resource element utilization
3Reliability
If ePDCCH transmission uses multiple DMRS ports for diversity, then transmission reliability improves, but resource element consumption increases
Solution Approach 1:
The patent merges the functions of multiple DMRS ports into a unified eREG structure that serves multiple control channel elements. By combining resource elements from different DMRS port groups into eREGs and selecting specific Sth positions across these groups, the system achieves diversity gain while reducing overall resource element consumption through shared resource utilization
Solution Approach 2:
The patent creates universal eREG structures that can serve multiple functions simultaneously - providing reference signaling, control channel transmission, and diversity gain through Sth position selection across different DMRS ports. This multi-functionality allows a single eREG to replace what would traditionally require multiple separate resource allocations, reducing total resource element consumption while maintaining reliability
Data Source
AI summary
Embodiments provide a control channel transmission method and apparatus. A control channel is mapped to an eREG. That corresponds to determined eREG information, among a designated number of eREGs in each unit physical resource block. Each eREG among the designated number of the eREGs is formed by a designated number of resource elements. The designated number of the resource elements are selected from corresponding resource elements at an Sth position in each group. S is a positive integer smaller than or equal to N. The control channel can be transmitted on the mapped eREG.