Multi-Cell DCI BWP Selection for Carrier Aggregation Scheduling
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Solution Overview
Problem
Existing communication technologies face high DCI overheads due to the inability to efficiently schedule UL or DL transmission on multiple cells using a single piece of DCI, leading to inefficient resource utilization and reduced system throughput in carrier aggregation scenarios.
Innovation Solution
A method for determining a target BWP based on first DCI capable of scheduling multiple cells, allowing terminals to determine and switch to an appropriate BWP for efficient transmission, thereby reducing DCI overheads and improving system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one piece of DCI schedules only UL or DL data on one cell, then the scheduling is simple and clear, but DCI overheads increase significantly in carrier aggregation scenarios
Solution Approach 1:
The patent merges multiple cell scheduling into a single DCI message by introducing a cell combination field that can indicate multiple cells simultaneously. This allows one DCI to schedule UL or DL data across multiple cells, reducing the number of separate DCI messages needed and thereby reducing overall DCI overheads in carrier aggregation scenarios.
Solution Approach 2:
The DCI message is enhanced with multi-functionality by adding fields such as cell combination indication, BWP indicator, and transmission configuration indication that enable a single DCI to perform multiple scheduling functions across different cells and bandwidth parts, rather than requiring separate DCI messages for each cell.
2Quantity of substance
If one piece of DCI schedules multiple cells, then DCI overheads are reduced, but BWP determination becomes ambiguous when multiple BWPs are configured
Solution Approach 1:
The patent applies local quality by associating specific BWP indicators with specific cells or cell combinations. The BWP indicator field in the DCI message can indicate different BWPs for different cells scheduled by the same DCI, allowing precise local BWP selection rather than a single global BWP for all cells.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network device configures multiple BWP sets corresponding to different cell combinations, and the DCI message selects from these pre-configured sets. This intermediary configuration layer resolves the ambiguity by providing clear mapping between DCI indicators and specific BWP combinations.
3Adaptability or versatility
If multiple BWPs are configured for different cells, then resource flexibility increases, but determining the target BWP for mc-DCI becomes unclear
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure multiple BWP sets corresponding to different cell combinations before mc-DCI scheduling occurs. These pre-configured BWP sets establish clear relationships between cell combinations and their associated BWPs, so that when mc-DCI is received, the terminal can directly determine the target BWP based on the indicated cell combination without ambiguity.
Solution Approach 2:
The patent uses parameter changes by introducing a BWP indicator field in the mc-DCI message that can take different values to indicate different BWP sets. The terminal determines the target BWP by interpreting this parameter change in the context of pre-configured BWP sets, enabling clear identification despite multiple BWPs being configured.
Data Source
AI summary
The present application discloses a BWP determining method, a transmission method, an apparatus, a terminal, and a network-side device, and belongs to the field of communication technologies. The BWP determining method includes: determining, by a terminal, a target BWP according to target information in first DCI, or determining, by a terminal, a current active BWP or a specific BWP as a target BWP corresponding to first DCI, where the first DCI is DCI capable of scheduling a plurality of cells or a plurality of carriers (201); and performing, by the terminal, transmission on the target BWP (202), where the target information includes BWP indicator and/or first information.