RedCap PDSCH Repetition Across Alternating Bandwidth Segments
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately and efficiently transmitting and receiving signals, particularly for user equipment with reduced capability (RedCap UE) that supports different size bandwidths for physical downlink control and shared channels.
Innovation Solution
A method for RedCap UE to receive downlink signals by alternating the location of the baseband for each repetition of the physical downlink shared channel (PDSCH) while maintaining the same radio frequency band, with downlink control information (DCI) providing details on the number of repetitions and PDSCH bandwidth limited to 5 MHz or less, and the PDCCH being repeated in the time domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the PDSCH bandwidth exceeds the UE supported bandwidth, then the data transmission capacity is improved, but the UE cannot receive the signal accurately due to bandwidth mismatch
Solution Approach 1:
The PDSCH bandwidth is divided into multiple segments corresponding to different repetitions. Each repetition carries a different portion of the PDSCH, allowing the UE to receive the complete data by combining multiple receptions with its limited bandwidth capability.
Solution Approach 2:
The PDSCH is transmitted periodically through multiple repetitions in the time domain. Each repetition occurs at regular intervals, enabling the UE to receive different portions of the PDSCH across multiple periodic transmissions and combine them to achieve complete data reception.
2Reliability
If the PDSCH is repeated multiple times in time domain, then the signal reception reliability is improved, but the transmission time is increased
Solution Approach 1:
Instead of transmitting the complete PDSCH in a single transmission, the system uses multiple repetitions where each repetition carries only a portion of the data. This partial action approach achieves reliable reception through combining while reducing the time required compared to traditional repeated transmissions of the entire data block.
3Adaptability or versatility
If the UE changes the baseband location for each PDSCH repetition, then the bandwidth utilization is improved, but the device complexity is increased
Solution Approach 1:
The baseband location is dynamically adjusted for each PDSCH repetition according to a predetermined pattern. This dynamic switching allows the UE to efficiently utilize different bandwidth portions across repetitions while maintaining a systematic and manageable switching mechanism that does not excessively increase device complexity.
Data Source
AI summary
A method by which a UE receives a signal in a wireless communication system, according to an embodiment, comprises: receiving downlink control information (DCI) via a physical downlink control channel (PDCCH); and on the basis of the DCI, receiving a repeated physical downlink shared channel (PDSCH) in a time domain, wherein on the basis that the PDSCH scheduled by the DCI exceeds a PDSCH bandwidth supported by the UE, the UE may alternately receive different portions of the PDSCH in respective repetitions of the PDSCH.