Uplink BWP Determination for HARQ Feedback in Multi-BWP 5G Systems
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Solution Overview
Problem
In 5G communications, when multiple bandwidth parts (BWPs) are activated on a single carrier, the uplink BWP used for HARQ feedback cannot be determined, leading to inefficiencies in data transmission and resource management.
Innovation Solution
A method where the terminal device receives configuration messages from the network device to determine the appropriate uplink BWP for HARQ feedback, using downlink control information (DCI) or radio resource control (RRC) signaling to identify the BWP, and activates it if necessary, ensuring it is in an active state for accurate feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple BWPs are activated on one carrier to support concurrent data of different service types, then the adaptability and service capability are improved, but the method to determine the uplink BWP for HARQ feedback becomes unclear and complex
Solution Approach 1:
The network device pre-configures multiple uplink BWPs and establishes correspondence relationships between them and downlink BWPs before actual data transmission. This preliminary configuration includes setting up BWP groups and defining which uplink BWP should be used for HARQ feedback of specific downlink BWPs, so that the terminal device can directly follow the pre-established rules without complex real-time determination
Solution Approach 2:
The patent introduces BWP groups as an intermediary concept to manage the correspondence between uplink and downlink BWPs. By grouping related BWPs together and defining group-level correspondence, the system simplifies the determination process - the terminal only needs to identify which BWP group the downlink BWP belongs to, and then use the corresponding uplink BWP from that group for HARQ feedback
2Device complexity
If only one BWP is activated on one carrier as in existing solutions, then the BWP determination method is simple, but the adaptability to support multiple service types concurrently is limited
Solution Approach 1:
The patent segments the single BWP activation model into multiple parallel BWP configurations. Instead of one active BWP, the system allows multiple BWPs to be activated simultaneously, each potentially serving different service types (e.g., eMBB, URLLC). The segmentation is further applied by dividing BWPs into groups with defined correspondence relationships, making the multi-BWP system manageable while maintaining simplicity
3Adaptability or versatility
If multiple BWPs are activated without clear determination rules, then the service capability is improved, but the resource management efficiency and data transmission efficiency deteriorate
Solution Approach 1:
The network device pre-configures multiple uplink BWPs and establishes correspondence relationships between them and downlink BWPs before actual data transmission. This preliminary configuration includes setting up BWP groups and defining which uplink BWP should be used for HARQ feedback of specific downlink BWPs, so that the terminal device can directly follow the pre-established rules without complex real-time determination
Solution Approach 2:
The patent implements a feedback mechanism where the terminal device sends HARQ feedback through the determined uplink BWP, and the network device receives this feedback to adjust and optimize the BWP configuration and correspondence relationships. This feedback loop ensures that the system can adapt to actual transmission conditions while maintaining efficient resource utilization
Data Source
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AI summary
This application provides a communication method and a communications apparatus. The method includes: receiving, by a terminal device, a configuration message from a network device, where the configuration message is used to configure a plurality of uplink BWPs and a plurality of downlink BWPs; determining, by the terminal device, a first BWP in the plurality of uplink BWPs, where the first BWP is used to transmit feedback information of downlink information that is on a second BWP, and the second BWP is any one of the plurality of downlink BWPs; receiving, by the terminal device, the downlink information on the second BWP; and sending, by the terminal device, the feedback information of the downlink information by using the first BWP, so that a BWP on which the feedback information is sent can be determined in a scenario in which a plurality of BWPs are activated.