CoMP Resource Mapping Rule Negotiation for Signal Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Coordinated Multi-Point (CoMP) transmission systems, User Equipment (UE) often fails to correctly receive downlink signals from multiple cooperative cells due to uncoordinated mapping rules for Orthogonal Frequency Division Multiplexing (OFDM) symbols between the PDCCH and data channels, leading to deteriorated system performance.
Innovation Solution
A method for negotiating and notifying resource mapping rules between cooperative cells, including the number and positions of OFDM symbols allocated to the PDCCH and data channel domains, ensuring accurate signal reception by the UE, by comparing allocations and setting unoccupied symbols or allocating them to either domain to establish a unified mapping rule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cooperative cells use independent mapping rules for OFDM symbols allocation, then each cell can optimize its own resource allocation flexibility, but the UE cannot correctly receive downlink signals due to inconsistency in resource mapping
Solution Approach 1:
The patent merges the mapping rules of multiple cooperative cells by selecting a reference cell and aligning all other cooperative cells to use the same mapping rule. This is achieved by configuring the same OFDM symbol allocation for PDCCH and data channels across all cooperative cells, ensuring consistent resource mapping while maintaining coordination benefits.
Solution Approach 2:
The patent segments the resource allocation into distinct domains (PDCCH domain and data channel domain) with clear boundaries defined by OFDM symbol positions. By segmenting the time-frequency resources and assigning specific symbol ranges to each domain consistently across cooperative cells, the system achieves both flexibility in allocation and consistency in reception.
2Reliability
If cooperative cells negotiate and unify mapping rules before transmission, then the UE can accurately receive signals from multiple cells, but the system complexity increases due to coordination overhead
Solution Approach 1:
The patent implements preliminary action by negotiating and unifying mapping rules among cooperative cells before downlink signal transmission. The network device configures the mapping rules in advance through RRC signaling or other control channels, so that all cooperative cells have consistent resource allocation information before actual data transmission begins, ensuring reliable UE reception without requiring real-time coordination.
3Adaptability or versatility
If OFDM symbols are allocated differently to PDCCH domain in different cooperative cells, then each cell can adapt to its specific traffic conditions, but the data channel domain resource allocation becomes inconsistent affecting system performance
Solution Approach 1:
The patent applies local quality by allowing different mapping rules for different cells based on their specific conditions, while maintaining consistency within the same domain across cells. Each cooperative cell can have customized OFDM symbol allocation for PDCCH domain according to its traffic needs, and the same customization applies to data channel domain, ensuring both local adaptability and overall system coordination.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method, a network device, and a system for determining resource mapping in CoMP transmission are disclosed. The method includes: the cooperative cells that perform CoMP transmission for a UE negotiate a mapping rule used by the cooperative cells when the status of the CoMP transmission of the UE changes, where the mapping rule includes the number of and position of OFDM symbols allocated to a PDCCH domain and/or a data channel domain; and the negotiated mapping rule is notified to the UE. In this embodiment, before the downlink signals are transmitted, the mapping rule used by each cooperative cell for CoMP transmission is negotiated between the cooperative cells, and therefore, the UE can accurately receive the signal sent by multiple cooperative cells and the performance of CoMP transmission in the system is improved.