Dynamic Search Space Modification for 5G Control Channel Efficiency
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G, face inefficiencies in dynamic resource management, leading to increased power consumption and reduced reliability due to static search spaces that do not adapt well to preempted or cancelled downlink data resources.
Innovation Solution
The implementation of dynamic search spaces in communication devices, where the search space for downlink control channels is modified by removing occupied control resources linked to preempted or cancelled data resources, allowing for implicit or explicit indication of occupied resources and enabling blind decoding on available candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static search spaces are used for downlink control channels, then device complexity is reduced and ease of operation is improved, but power consumption increases and reliability decreases due to inability to adapt to preempted or cancelled data resources
Solution Approach 1:
The search space configuration is made dynamic by allowing modification of the semi-statically configured search space based on preemption indications. When downlink data resources are preempted or cancelled, the UE receives an indication and dynamically modifies the search space to remove occupied control resources, enabling adaptation to changing resource availability while maintaining reliable communication.
2Reliability
If static search spaces are used for downlink control channels, then device complexity is reduced and ease of operation is improved, but reliability decreases due to inability to adapt to preempted or cancelled data resources
Solution Approach 1:
The search space configuration is made dynamic by allowing modification of the semi-statically configured search space based on preemption indications. When downlink data resources are preempted or cancelled, the UE receives an indication and dynamically modifies the search space to remove occupied control resources, enabling adaptation to changing resource availability while maintaining reliable communication.
3Reliability
If blind decoding is performed on all search space candidates, then reliability is improved by ensuring DCI block reception, but power consumption increases due to unnecessary decoding attempts on occupied resources
Solution Approach 1:
The search space configuration is made dynamic by allowing modification of the semi-statically configured search space based on preemption indications. When downlink data resources are preempted or cancelled, the UE receives an indication and dynamically modifies the search space to remove occupied control resources, enabling adaptation to changing resource availability while maintaining reliable communication.
Solution Approach 2:
The patent extracts and removes occupied control resources from the search space based on preemption indications. By identifying and eliminating control resources linked to preempted or cancelled data resources, the UE performs blind decoding only on available candidates, reducing unnecessary power consumption while maintaining reliable DCI block reception.
4Loss of time
If static search spaces are used, then ease of operation is improved, but latency performance worsens due to inability to dynamically adjust to resource preemptions
Solution Approach 1:
The search space configuration is made dynamic by allowing modification of the semi-statically configured search space based on preemption indications. When downlink data resources are preempted or cancelled, the UE receives an indication and dynamically modifies the search space to remove occupied control resources, enabling adaptation to changing resource availability while maintaining reliable communication.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE) may receive, on a downlink channel, a configuration defining a search space for a downlink control channel. The UE may receive, on the downlink channel, a message including an indication of occupied control resources within the search space. Based on the indication, the UE may monitor a modified version of the search space for a downlink control information (DCI) block. The UE may receive, on the downlink control channel, the DCI block based on the monitoring.