Wireless Search Space Configuration for Uplink Grant Decoding
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Solution Overview
Problem
In wireless communication systems, apparatuses face inefficiencies in blind decoding processes for uplink and downlink scheduling information, leading to excessive processing requirements and power consumption due to the need to perform blind decodes for all possible formats and aggregation levels.
Innovation Solution
An apparatus is configured to receive radio resource control information that indicates usable slots for uplink grant information. It determines whether a slot is of a first type (not for uplink grants) or a second type (for uplink grants) and focuses blind decoding on slots of the second type, thereby reducing unnecessary processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding is performed for all possible downlink control information formats at all possible configured aggregation levels, then scheduling information can be reliably received, but processing complexity and power consumption increase significantly
Solution Approach 1:
The patent segments the blind decoding process by introducing search space sets that are divided into types (common and dedicated). Common search space sets are used for system-wide scheduling information while dedicated search space sets are used for user-specific information. This segmentation allows the apparatus to focus decoding efforts on relevant search spaces rather than attempting to decode all possible formats across all aggregation levels, thereby reducing processing complexity while maintaining reliable reception of scheduling information.
Solution Approach 2:
The patent applies local quality by configuring different search space sets with specific properties (monitoring occasions, aggregation levels, DCI formats) tailored to different purposes. Common search space sets are configured for system information and downlink scheduling, while dedicated search space sets are configured for uplink scheduling and user-specific information. This localized optimization of search space characteristics reduces the overall decoding burden by ensuring that each search space set is optimized for its specific function rather than attempting to handle all possible cases uniformly.
2Reliability
If blind decoding is performed for all possible downlink control information formats at all possible configured aggregation levels, then all scheduling information can be detected, but power consumption increases due to excessive processing
Solution Approach 1:
The patent segments the monitoring and decoding process by dividing search spaces into common and dedicated types with distinct monitoring configurations. The apparatus only monitors and attempts to decode DCI formats in the search space sets that are configured for its specific needs based on RRC signaling. This segmentation eliminates the need to continuously monitor all possible DCI formats at all aggregation levels, significantly reducing power consumption while maintaining the ability to detect all relevant scheduling information.
Solution Approach 2:
The patent implements periodic action through configured monitoring occasions within search space sets. Instead of continuously monitoring all possible DCI formats, the apparatus monitors only at specific periodic intervals defined by the search space configuration. This periodic monitoring approach reduces power consumption by allowing the apparatus to enter low-power states between monitoring occasions while ensuring that scheduling information is detected at appropriate intervals.
3Reliability
If search space is configured to include all slots allocatable for downlink information, then downlink control information can be received, but uplink grant information processing becomes inefficient
Solution Approach 1:
The patent segments the slot utilization by introducing the concept of mixed slots that can carry both downlink and uplink grant information. The search space configuration is divided into common search space sets for downlink control information and dedicated search space sets for uplink grant information. This segmentation allows the apparatus to efficiently process uplink grants in dedicated search spaces during mixed slots while maintaining reliable reception of downlink control information in common search spaces, thereby improving uplink grant processing efficiency without sacrificing downlink control information reception.
Data Source
AI summary
To increase number of candidates, configuration information that at least indicates slots usable for carrying uplink grant information among slots allocatable at least for downlink information may be transmitted or received in a radio resource control information. Said configuration information may be applied to determine, per a slot in a downlink control channel, whether the slot is of a first type that is not for carrying any uplink grant information or of a second type that is for carrying at least uplink grant information. An apparatus may determine a search space for blind decoding for uplink grant information to be a space comprising slots of the second type and not slots of the first type. An apparatus may transmit at least uplink grant information in the slots of the second type and downlink information at least in the slots of the first type.