5G Control Channel Interleaving for Blocking Reduction
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Solution Overview
Problem
5G wireless communication systems face challenges in efficiently transmitting download control channels due to high blocking probability and interference, particularly in distributed transmission methods, which affect the diversity gain and power consumption of user equipment (UE) blind decoding.
Innovation Solution
The proposed solution involves designing a nested search space structure with multiple partial search spaces and using interleaving methods to randomize interference, such as interleaving REG bundles and applying offsets, to minimize blocking probability and optimize resource distribution in 5G communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed transmission method is used for download control channels, then coverage and reliability are improved, but blocking probability increases and diversity gain decreases
Solution Approach 1:
The control channel resources are segmented into multiple search space sets, each with different aggregation levels and candidate numbers. This segmentation allows the system to distribute control information across multiple resources while maintaining manageable complexity for blind decoding, thereby reducing blocking probability while preserving the reliability benefits of distributed transmission.
Solution Approach 2:
The patent changes key parameters of the search space structure, including aggregation levels (L=1,2,4,8), number of candidates per set, and total search space configuration. By optimizing these parameters, the system achieves better resource distribution and reduces blocking probability while maintaining the diversity gain needed for reliable control channel reception in distributed transmission mode.
2Length of stationary object
If distributed transmission method is used for download control channels, then coverage is improved, but diversity gain decreases
Solution Approach 1:
The patent implements a nested structure where multiple search space sets are organized hierarchically with different aggregation levels. Lower aggregation level sets are nested within higher aggregation level sets, allowing the UE to efficiently search through candidates while maintaining diversity. This nested organization preserves diversity gain by ensuring that control information can be received through multiple paths while extending coverage through flexible resource distribution.
3Reliability
If nested search space structure with multiple partial search spaces is used, then blocking probability is reduced and resource distribution is optimized, but device complexity increases
Solution Approach 1:
The patent defines specific parameter configurations for search space sets including aggregation levels (1, 2, 4, 8), candidate counts (1, 2, 4, 8), and monitoring occasions. These standardized parameter sets provide a systematic framework that reduces configuration complexity while enabling flexible optimization of blocking probability reduction through controlled variation of these parameters across different search space sets.
Data Source
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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.