PDCCH Active Beam Selection for DL and SBFD Time Units
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Solution Overview
Problem
In wireless communication systems, determining optimal beams for Physical Downlink Control Channel (PDCCH) transmission in both Downlink (DL) and Subband Full Duplex (SBFD) time units is challenging due to differences in transmit and receive chains, leading to interference and suboptimal performance.
Innovation Solution
A method and apparatus for determining active beams by receiving first information from an access network device, which indicates different beams for DL and SBFD time units based on second information including beam candidate information, allowing flexible and reliable PDCCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same active beam is used for PDCCH transmission in both DL and SBFD time units, then the device complexity is reduced and operation is simplified, but interference occurs and communication reliability deteriorates
Solution Approach 1:
The patent segments the beam configuration by time unit type, establishing separate active beam determination mechanisms for DL time units and SBFD time units. The network device configures different active beams for different time unit types, allowing optimized performance for each scenario while maintaining manageable complexity through structured segmentation.
Solution Approach 2:
The patent introduces dynamic beam switching capability where the terminal device can adaptively select different active beams based on the current time unit type. This dynamic adjustment enables the system to optimize beam selection for each specific transmission scenario (DL or SBFD), improving reliability without requiring permanent complex configuration structures.
2Reliability
If different active beams are configured for DL and SBFD time units, then PDCCH transmission reliability is improved by mitigating interference, but device complexity increases
Solution Approach 1:
The patent establishes a universal beam management framework that handles both DL and SBFD time units through a unified determination mechanism. The same core logic and procedures are applied across different time unit types, allowing the system to manage multiple beam configurations without proportionally increasing complexity. The network device and terminal device use consistent protocols and methods regardless of time unit type.
Solution Approach 2:
The patent changes the beam selection parameter based on time unit type rather than creating entirely separate configuration systems. By adjusting which beam from an existing set is designated as active based on whether the current time unit is DL or SBFD, the system achieves differentiated performance without maintaining separate complete beam management infrastructures for each case.
3Productivity
If beam information of candidate beams is processed to determine optimal active beams, then communication efficiency is improved, but information processing complexity increases
Solution Approach 1:
The patent implements preliminary action by having the network device pre-configure a set of candidate beams and their associated information before actual PDCCH transmission. The terminal device receives and stores this beam information in advance, so that when determination of the active beam is needed, the processing can be performed efficiently using pre-prepared data rather than gathering information in real-time.
Data Source
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AI summary
Provided in the embodiments of the present disclosure are a method and apparatus for determining an active beam, a communication device, and a storage medium. The method comprises: receiving first information sent by an access network device, the first information being configured to indicate the active beam; and according to the first information and second information, determining an active beam used by a physical downlink control channel (PDCCH) transmitted in a downlink (DL) time unit and/or in a subband full duplex (SBFD) time unit, wherein the second information comprises beam information of candidate beams; and the active beams used when transmitting the PDCCH in the DL time unit and in the SBFD time unit are different. As such, the active beams can be configured to perform the transmission of the PDCCH with respect to the DL time unit and the SBFD time unit, respectively, so that the transmission of the PDCCH is more flexible and reliable.