Wireless Device Control Resource Set Switching for DCI Reception
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Solution Overview
Problem
In 5G wireless communication networks, the overlap of synchronization signal blocks with control channel resources in time slots where the synchronization signal block is transmitted prevents wireless devices from receiving downlink control information, as the control channel resources allocated for DCI are used for transmitting the synchronization signal block instead.
Innovation Solution
Wireless devices are configured with two or more control resource sets, allowing them to determine the state of a time slot and select either the first or second control resource set for monitoring DCI based on the presence or absence of the synchronization signal block, with the base station signaling resource identifiers to facilitate this switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel resources are allocated for DCI reception in time slots where SS block is transmitted, then DCI reception capability is improved, but resource conflict occurs as the same resources are needed for SS block transmission
Solution Approach 1:
The control resource sets are segmented into multiple groups (first control resource set and second control resource set) that are associated with different SS block transmission patterns. The wireless device is configured to use different control resource sets depending on whether an SS block is present in a time slot, thereby avoiding resource conflicts while maintaining DCI reception capability.
2Reliability
If multiple control resource sets are configured for different time slot states, then DCI reception reliability is improved, but device complexity increases
Solution Approach 1:
The network pre-configures multiple control resource sets and associates them with different SS block transmission patterns before the wireless device operates. The wireless device stores these pre-configured control resource sets and automatically selects the appropriate one based on the detected SS block presence, eliminating the need for dynamic negotiation and reducing operational complexity.
Solution Approach 2:
The wireless device monitors for the presence or absence of SS blocks in time slots and uses this feedback information to dynamically select the appropriate control resource set. This feedback mechanism enables the system to adapt to varying transmission conditions while maintaining simple selection logic based on pre-configured associations.
3Reliability
If SS block is transmitted in time slots, then synchronization capability is improved, but control channel resource availability deteriorates
Solution Approach 1:
The system dynamically adjusts the control resource set configuration based on SS block transmission patterns. Different control resource sets are defined for time slots with SS block transmission versus time slots without SS block transmission. The wireless device adapts its control channel monitoring behavior dynamically by selecting the appropriate control resource set based on the current time slot's SS block status, ensuring both synchronization and control information reception are maintained.
Data Source
AI summary
A wireless device is configured with or allocated two or more control resource sets for receiving downlink control information from a base station or cell. The two or more control resource sets correspond to two or more possible states of a time slot used for downlink transmission. The wireless device determines the state of a time slot and selects one or the two or more control channel resource sets to monitor for DCI depending on the state of the time slot. In one exemplary embodiment, the time slot has two possible states and the state of the time slot is determined by the presence or absence of an SS block.