5G Control Channel Interleaving for Blocking Probability Reduction
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Solution Overview
Problem
In 5G wireless communication systems, the efficient transmission of download control channels is hindered by the trade-off between blocking probability and diversity, particularly in distributed transmission methods where control regions with different configurations overlap, leading to increased blocking probability and interference.
Innovation Solution
The proposed solution involves designing a nested search space structure with multiple partial search spaces, each configured to ensure even performance through blind decoding scaling and using interleaving methods to randomize interference, such as interleaving REG bundles and applying offsets, to minimize blocking probability and enhance frequency-axis diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed transmission methods are used to maximize frequency-axis diversity, then diversity is improved, but blocking probability increases due to interference in overlapping control regions
Solution Approach 1:
The search space is segmented into multiple partial search spaces, each with its own set of PDCCH candidates. This segmentation allows the system to distribute control channel candidates across different resource regions, reducing interference and blocking probability while maintaining frequency-axis diversity through the distributed transmission method.
2Productivity
If control regions with different configurations are overlapped to improve resource utilization, then resource efficiency is improved, but interference increases leading to higher blocking probability
Solution Approach 1:
The patent applies preliminary actions by pre-configuring multiple partial search spaces with specific PDCCH candidate sets before transmission. This allows the system to pre-establish resource allocations and interference mitigation strategies, enabling control regions with different configurations to overlap efficiently while minimizing blocking probability through advance planning of resource distribution.
Data Source
AI summary
A 5th Generation (5G) or pre-5G communication system for supporting higher data transmission rates beyond 4th Generation (4G) communication systems such as long term evolution (LTE) systems. A method for transmitting download control information in a communication system is provided. The method includes configuring the control information indicating at least one control channel element (CCE) including at least one resource element group (REG) unit interleaved based on the interleaving information indicated by a higher layer signaling; and transmitting, to a user equipment (UE), the configured control information.