PUSCH Repeated Transmission TCI Mapping for Wireless Uplink
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Solution Overview
Problem
Conventional methods for repeatedly transmitting an uplink channel to multiple transmission reception points (TRPs) fail to achieve frequency diversity gain and deteriorate channel estimation performance.
Innovation Solution
A method and apparatus for a terminal to repeatedly transmit a physical uplink shared channel (PUSCH) by receiving configuration information and downlink control information, sequentially and circularly mapping transmission configuration indicators (TCI) to the PUSCHs, grouping PUSCHs with identical TCI, and applying frequency hopping to each group, allowing for transmission to different TRPs with precoding and modulation/coding schemes based on each TRP's channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional repetitive transmission method of an uplink channel is used, then the transmission can be performed to multiple TRPs, but frequency diversity gain cannot be obtained and channel estimation performance is deteriorated
Solution Approach 1:
The patent segments the N PUSCH transmissions into M groups based on TCI state mapping. Each group is assigned a specific TCI state, allowing different channel estimation procedures for different groups. This segmentation enables frequency diversity gain while maintaining manageable complexity through structured group management.
Solution Approach 2:
The patent dynamically maps TCI states to PUSCH transmissions in a sequential and circular manner. The TCI state for each transmission is determined by the formula (i mod M), where i is the transmission index. This dynamic mapping adapts to different transmission scenarios and enables flexible frequency hopping patterns across multiple TRPs.
2Reliability
If frequency hopping is applied to all PUSCH transmissions, then frequency diversity gain can be obtained, but the complexity of managing multiple TCI states increases
Solution Approach 1:
The patent applies local quality by assigning different TCI states to different groups of PUSCH transmissions. Each group receives a specific TCI state appropriate for its frequency hopping pattern and target TRP. This localized configuration optimizes channel estimation for each group while avoiding the need to manage all possible TCI state combinations globally.
Solution Approach 2:
The patent applies partial action by implementing frequency hopping only within each TCI state group rather than across all transmissions uniformly. The frequency hopping is applied partially to M groups, where each group handles a subset of the N total transmissions. This partial application reduces the overall complexity of TCI state management while still achieving frequency diversity within each group.
3Measurement precision
If PUSCH transmissions are grouped by identical TCI states, then channel estimation performance is improved, but the number of groups and management overhead increases
Solution Approach 1:
The patent changes the parameter of TCI state assignment from static to dynamic modular mapping. By using the formula (i mod M), the system efficiently determines which TCI state to apply for each transmission based on its index. This parameter change enables systematic grouping that improves channel estimation while maintaining transmission efficiency through predictable patterns.
Data Source
AI summary
Disclosed are a method and apparatus for repeatedly transmitting an uplink in a wireless communication system. A method by which a terminal repeatedly transmits a physical uplink shared channel (PUSCH), according to an embodiment of the present disclosure, comprises the steps of: receiving configuration information related to repeated transmission of the PUSCH; receiving downlink control information (DCI) for scheduling of the PUSCH; and repeatedly transmitting the PUSCH N times (an integer, greater than 1, of N) on the basis of the configuration information and the DCI. The PUSCH transmitted N times is circularly and sequentially mapped to a plurality of transmission configuration indicator (TCI) states in an ascending order, may be grouped into M PUSCH groups (an integer, greater than 1, of N) for each PUSCH to which the same TCI is mapped, and frequency hopping may be individually applied to the M PUSCH groups.