Interleaved Control Channel for Spatial Division Multiplexing
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Solution Overview
Problem
Wireless communication systems in higher frequency bands, such as those operating in the 6+ GHz range, face challenges in interleaving downlink control information (DCI) across multiple transmit beams, which affects the robustness of control signaling and decoding in the presence of blockers or interferers.
Innovation Solution
The described techniques involve interleaving all downlink control information (DCI) related to a user equipment (UE) over its transmit beams, configuring multiple control channel search space combinations, and defining the interleaving by ordering DCIs in sequential ordering and filling table rows with encoded values, allowing the UE to decode DCIs more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI is transmitted through multiple transmit beams in higher frequency bands, then spatial diversity and robustness against blockers are improved, but the complexity of interleaving control channels and decoding PDCCH increases
Solution Approach 1:
The patent segments the control channel into multiple search spaces, each associated with a specific transmit beam. This segmentation allows the DCI to be distributed across multiple spatial paths (beams), providing diversity and robustness against blockers while maintaining manageable complexity through structured organization of the segmented components
Solution Approach 2:
The patent introduces a new dimension to the control channel structure by mapping DCI across multiple transmit beams in the spatial domain. This dimensional expansion from single-beam to multi-beam transmission adds spatial diversity without fundamentally altering the temporal or frequency structure, thereby improving robustness with controlled complexity increase
2Reliability
If multiple search spaces are configured for interleaved DCI transmission, then diversity and robustness are improved, but the number of configuration parameters and signaling overhead increases
Solution Approach 1:
The patent defines search spaces in a universal manner that can be reused across different transmit beams and configuration scenarios. The search space structure serves multiple functions: it organizes DCI for multiple beams, provides diversity, and enables flexible configuration through a standardized framework, thereby reducing the need for unique parameters for each beam
Solution Approach 2:
The patent employs parameter changes to adapt the search space configuration to different transmission scenarios. By modifying parameters such as the association between search spaces and transmit beams, the system can accommodate different numbers of beams and configuration requirements without fundamentally changing the overall structure, thus managing complexity through parameter adaptation rather than structural redesign
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, a signal identifying a configuration of a plurality of search spaces to monitor for a plurality of downlink control information (DCI) transmissions, wherein the plurality of search spaces is interleaved over a plurality of transmit beams of the base station, and each DCI transmission carries information associated with one or more transmit beams of the plurality of transmit beams. The UE may monitor the plurality of search spaces for the plurality of DCI transmissions associated with the UE, wherein each search space of the plurality of search spaces includes at least a portion of each DCI transmission of the plurality of DCI transmissions. The UE may decode each received DCI transmission in the plurality of DCI transmissions based at least in part on the monitoring.