Default Beam Selection in 5G Cross-Carrier Scheduling
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in efficiently configuring beams for data reception when beam information is not indicated to user equipment, leading to potential data loss and increased overhead due to the need for default beam assumptions.
Innovation Solution
A method is introduced where a terminal in a wireless communication system receives cross-carrier scheduling configuration with a carrier indicator field (CIF) in downlink control information (DCI), and if the offset between DCI and physical downlink shared channel (PDSCH) reception is less than a threshold, it uses quasi-co-located parameters for default beam selection based on the lowest control resource set identifier within an active bandwidth part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If beam information is not indicated to user equipment, then overhead is reduced, but data reception reliability deteriorates due to default beam assumptions
Solution Approach 1:
The patent applies preliminary action by pre-configuring QCL parameters and establishing default beam assumptions before data reception occurs. The terminal pre-identifies the lowest CORESET ID and stores its QCL parameters, so when beam information is not indicated, the terminal can immediately use the pre-prepared default beam without requiring real-time beam indication, thus maintaining reliability while reducing overhead.
2Loss of substance
If default beam selection is implemented, then beam configuration overhead is reduced, but latency increases due to threshold checking and parameter identification
Solution Approach 1:
The patent applies preliminary action by pre-identifying the lowest CORESET ID and storing its QCL parameters in advance. When data reception occurs, the terminal only needs to check whether beam information is indicated and whether the offset threshold is met, rather than performing complex beam identification from scratch, thus reducing the time loss while implementing default beam selection.
3Adaptability or versatility
If cross-carrier scheduling with CIF is used, then scheduling flexibility is improved, but device complexity increases due to additional field processing
Solution Approach 1:
The patent applies self-service by making the terminal autonomously determine whether to apply default beam selection based on pre-configured thresholds and parameters. The terminal independently checks the offset between DCI and PDSCH, compares it with the threshold, and decides whether to use the default beam without requiring additional network control signals, thus reducing DCI processing complexity while maintaining the scheduling flexibility provided by cross-carrier scheduling with CIF.
Data Source
AI summary
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of a terminal in a wireless communication system is provided. The method includes receiving, from a first cell of a base station, cross carrier scheduling configuration including information indicating that a carrier indicator field (CIF) is included in downlink control information (DCI); receiving, from the first cell of the base station, the DCI for scheduling a physical downlink shared channel (PDSCH), the DCI including the CIF; if the CIF indicates that a resource assignment of the PDSCH is for the first cell, identifying whether a first offset value between a reception of the DCI and the PDSCH is less than a threshold; and in case that the first offset value is less than the threshold and the terminal supports default beam selection for the PDSCH, receiving, from the first cell of the base station, data on the PDSCH based on quasi co-located (QCL) parameters for a control resource set (CORESET) associated with a search space with a lowest CORESET identifier (ID) within an active bandwidth part (BWP) of the first cell in a latest slot monitored by the terminal.