Search Space Set Configuration for Flexible Duplex in NR
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Solution Overview
Problem
Existing New Radio (NR) systems face challenges in resource utilization and delay due to the half-duplex mode in TDD spectrum, leading to a need for more flexible duplex modes like full duplex or SubBand non-overlapping Full Duplex (SBFD) mode.
Innovation Solution
The method involves determining the search space sets linked together, specifically by receiving information blocks to identify reference time-domain resource sets and monitoring PDCCH candidates across different search space sets, thereby configuring appropriate target search space sets based on orthogonal relationships between time units and resource sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If half-duplex mode is used in TDD spectrum, then self-interference is avoided and Cross Link interference is reduced, but resource utilization ratio is reduced and delay is increased
Solution Approach 1:
The patent segments the TDD spectrum into multiple search space sets (first search space set, second search space set, third search space set) with different link configurations. This allows different portions of the spectrum to operate in different duplex modes simultaneously, resolving the contradiction by enabling full-duplex operation in some segments while maintaining half-duplex in others, thus improving resource utilization while managing interference through spatial and spectral separation.
Solution Approach 2:
The patent introduces dynamic switching between half-duplex and full-duplex modes through configurable search space sets. The network can dynamically select which search space set to use based on traffic conditions, allowing the system to adapt between interference-avoidance mode (half-duplex) and resource-utilization mode (full-duplex), thereby resolving the static contradiction through dynamic behavior.
2Reliability
If half-duplex mode is used in TDD spectrum, then self-interference is avoided and Cross Link interference is reduced, but delay is increased
Solution Approach 1:
By segmenting the control channel into multiple search space sets with different link directions, the patent enables simultaneous uplink and downlink operations in different spectral segments. This reduces the waiting time for resource allocation and decreases delay compared to sequential half-duplex operation, while maintaining interference avoidance through proper segmentation.
3Productivity
If flexible duplex mode or full duplex mode is supported, then resource utilization is improved and delay is reduced, but device complexity increases
Solution Approach 1:
The patent creates a universal framework where a single PDCCH monitoring mechanism handles multiple duplex modes through different search space set configurations. The same UE can monitor multiple search space sets corresponding to different duplex modes, allowing the system to support flexible duplexing without requiring separate hardware or fundamentally different processing paths for each mode, thus limiting the increase in device complexity.
Solution Approach 2:
The network configures multiple search space sets in advance, each corresponding to different duplex modes and link directions. This preliminary configuration allows the UE to have all necessary monitoring capabilities pre-established, reducing the need for complex real-time decisions and dynamic reconfiguration, thereby limiting complexity growth while enabling flexible duplex support.
4Adaptability or versatility
If multiple search space sets are configured for different duplex modes, then adaptability is improved, but configuration complexity increases
Solution Approach 1:
The patent assigns different qualities and characteristics to different search space sets (e.g., first search space set for downlink, second for uplink, third for flexible modes). Each search space set is optimized for its specific purpose with appropriate monitoring parameters and link configurations. This local optimization allows the system to achieve high adaptability across different duplex scenarios while keeping each individual configuration relatively simple and manageable.
Data Source
AI summary
A first receiver receives a second information block, the second information block being used to determine that a first search space set is linked to a second search space set and a third search space set; receives a first information block, the first information block being used to determine a reference time-domain resource set; and monitors in a first time unit at least first PDCCH candidate in the first search space set and at least target PDCCH candidate in a target search space set; where the first PDCCH candidate and the target PDCCH candidate are monitored to detect DCI format with identical information; whether the target search space set is the second search space set or the third search space set depends on whether the first time unit and the reference time-domain resource set are orthogonal. This application reduces interference and enhances the system flexibility.