Carrier Aggregation and CoMP Coordination in Radio Systems
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Solution Overview
Problem
The challenge lies in effectively combining carrier aggregation and coordinated multiple point (CoMP) transmission/reception techniques in a radio communication system that aggregates multiple fundamental frequency blocks, particularly in maintaining backward compatibility and improving system performance while managing interference between cells.
Innovation Solution
The solution involves a radio communication system where carrier aggregation is applied in the same frequency band, with first and second radio base stations performing coordinated multiple point transmission to a user terminal, sharing retransmission control for uplink signals and mapping downlink signals to radio resources separately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is applied to aggregate multiple fundamental frequency blocks to achieve broadbandization, then system bandwidth and data rate are improved, but interference between cells increases and system complexity increases
Solution Approach 1:
The system divides the aggregated carrier bandwidth into separate frequency blocks, each handled by different base stations for CoMP transmission. This segmentation allows interference coordination between cells while maintaining the benefits of carrier aggregation for high data rates.
Solution Approach 2:
The patent introduces coordination mechanisms as intermediaries between base stations performing CoMP transmission. These coordination entities manage interference between cells by coordinating resource allocation and transmission parameters across multiple base stations, enabling both carrier aggregation and interference management.
2Reliability
If CoMP transmission is implemented across multiple base stations to reduce interference, then received quality is improved, but system complexity and coordination overhead increase
Solution Approach 1:
The CoMP transmission function is segmented into specific modules within base stations, separating coordination functions from transmission functions. This modular segmentation reduces overall system complexity by allowing independent optimization and management of coordination and transmission components.
Solution Approach 2:
The patent designs base station apparatus with multi-functional capabilities that can perform both standard transmission and CoMP coordination functions. This universality reduces system complexity by eliminating the need for separate dedicated coordination infrastructure, as existing base stations can fulfill multiple roles.
3Reliability
If retransmission control is shared between base stations in CoMP, then reliability during cell switching is improved, but control complexity increases
Solution Approach 1:
The patent merges retransmission control functions across multiple base stations participating in CoMP transmission. By combining HARQ-ACK reception and retransmission decision-making into a shared control mechanism, the system maintains reliable communication during cell switching while managing control complexity through unified coordination protocols.
Data Source
AI summary
The present invention is designed to effectively apply carrier aggregation and Coordinated Multiple Point (CoMP) transmission/reception in a system band that is formed with a plurality of fundamental frequency blocks. A radio communication system where carrier aggregation is applicable in the same frequency band, and, this radio communication system includes the first radio base station apparatus and a second radio base station apparatus that perform coordinated multiple point transmission to a user terminal using cells having the same frequency band, and the first radio base station apparatus and the second radio base station apparatus perform retransmission control for uplink signals from the user terminal on a shared basis, and perform mapping of downlink signals to radio resources separately.