Coordinated Multiple Point Transmission Resource Mapping
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Solution Overview
Problem
In coordinated multiple point transmission and reception (CoMP) systems, there is a collision issue between reference signals and data resource elements, which affects the performance of physical downlink shared channel (PDSCH) transmissions due to differences in cell-specific reference signal (CRS) configurations and OFDM symbol allocations across cells, leading to interference and mismatched starting points for data transmission.
Innovation Solution
The solution involves excluding the union of resource elements (REs) allocated for reference signals from the resource mapping for data transmission in CoMP, ensuring that data is not sent on REs used for CRS transmissions, and dynamically adjusting the PDSCH starting point to align with the serving cell's configuration, thereby avoiding collisions and maintaining spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals and data are mapped on the same resource elements in CoMP transmissions from multiple cells, then resource utilization is maximized, but interference occurs between CRS and PDSCH leading to degraded transmission performance
Solution Approach 1:
The patent extracts reference signals from data resource elements by identifying and excluding REs allocated for CRS from PDSCH resource mapping. The network side determines the union of REs for reference signals from multiple TPs and prevents data mapping on these excluded REs, thereby eliminating CRS-PDSCH interference while maintaining efficient resource utilization in non-excluded REs
Solution Approach 2:
The patent applies preliminary action by pre-determining the union of resource elements allocated for reference signals from multiple transmission points before performing PDSCH resource mapping. This advance identification and exclusion of reference signal REs ensures that data transmission does not collide with CRS, preventing interference before it occurs
2Adaptability or versatility
If PDSCH mapping follows different cell configurations in CoMP, then each cell can maintain its own CRS pattern, but starting points for data transmission become mismatched across cells
Solution Approach 1:
The patent merges the PDSCH resource mapping configuration across multiple cells by aligning all PDSCH starting points to a common reference (serving cell configuration). This unified approach ensures that despite different cell-specific CRS patterns, all transmission points use consistent PDSCH resource element mapping, eliminating starting point mismatch and ensuring stable coordinated transmission
Data Source
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AI summary
A method implemented in a mobile communications network supporting coordinated multiple point transmission and reception (CoMP) is disclosed. The method includes transmitting, to a user equipment (UE), data in a physical downlink shared channel (PDSCH), and transmitting a reference signal to the UE, wherein a union of resource elements (REs) allocated for reference signals transmitted from a subset of a plurality of transmission points (TPs) in a CoMP set are excluded from resource mapping for transmitting the data to the UE. Other methods, systems, and apparatuses also are disclosed.