Multi-beam Piggyback DCI Transmission for Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in reliably transmitting piggyback downlink control information (DCI) due to the lower reliability associated with beamformed PDSCH transmission, leading to unsuccessful decoding and resource utilization issues.
Innovation Solution
The proposed solution involves transmitting piggyback DCI using multiple beams, where the DCI is repeated on a corresponding plurality of transmit beams, including scheduling information for PDSCHs, to improve reliability and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If piggyback DCI is transmitted using beamformed PDSCH, then data rate and propagation properties are improved, but transmission reliability deteriorates
Solution Approach 1:
The piggyback DCI transmission is segmented across multiple PDSCH transmissions, each carrying a portion or repetition of the DCI. This segmentation allows the receiver to combine information from multiple transmissions, improving reliability while maintaining the benefits of beamformed high data rate transmission.
Solution Approach 2:
The patent transmits the piggyback DCI multiple times in advance before the actual data transmission. This preliminary repetition ensures that the DCI is reliably received before the PDSCH data arrives, resolving the reliability issue while preserving the high data rate capability of beamforming.
2Productivity
If piggyback DCI is transmitted using beamformed PDSCH, then spectral efficiency is improved, but decoding success rate deteriorates
Solution Approach 1:
The piggyback DCI is transmitted periodically across multiple PDSCH occasions with regular intervals. This periodic transmission ensures that at least one instance is successfully decoded, maintaining high spectral efficiency through beamforming while guaranteeing decoding success through repeated opportunities.
Solution Approach 2:
Multiple copies of the piggyback DCI are transmitted across different PDSCH transmissions. Each copy carries the same control information, allowing the receiver to successfully decode the DCI from any one of the copies, thereby maintaining spectral efficiency while improving decoding success rate.
3Reliability
If multiple repetitions of DCI are transmitted on multiple beams, then transmission reliability is improved, but network resource usage increases
Solution Approach 1:
Multiple PDSCH transmissions that would otherwise carry different data are merged to carry repetitions of the same piggyback DCI. This combining approach improves transmission reliability through diversity while minimizing additional network resource consumption by utilizing existing scheduled transmissions.
Solution Approach 2:
The PDSCH transmissions serve dual functions: delivering user data and transmitting piggyback DCI repetitions. This multi-functionality allows the system to improve DCI transmission reliability without proportionally increasing network resource usage, as the same resources serve multiple purposes.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive, on a downlink control channel and a first beam, first downlink control information (DCI), wherein the first DCI identifies a second DCI that is carried on a downlink shared channel; and receive multiple repetitions of the second DCI on the downlink shared channel on a plurality of second beams.