Terminal PUSCH Time Location Determination for NR Random Access
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Solution Overview
Problem
In the New Radio (NR) radio communication system, the 2-step random access procedure faces challenges in determining the time domain location of the Physical Uplink Shared Channel (PUSCH) occasion when the subcarrier spacing of the PUSCH occasion differs from that of the Physical Random Access Channel (PRACH) occasion.
Innovation Solution
A terminal is equipped with a receiving unit to receive parameters from a base station, a control unit to determine the time domain location of the PUSCH slot based on the location of the RACH slot, subcarrier spacings, and the received parameter, and a transmitting unit to transmit the PUSCH at the determined location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a 2-step random access procedure is implemented with different subcarrier spacings for PUSCH and PRACH occasions, then the system can support higher data transmission rates and more flexible resource allocation, but the time domain location of the PUSCH occasion cannot be properly identified
Solution Approach 1:
The patent applies parameter changes by introducing a reference subcarrier spacing (first subcarrier spacing) as a baseline parameter. When the PUSCH occasion uses a different subcarrier spacing (second subcarrier spacing) than the PRACH occasion, the patent uses the reference parameter to define the time domain location relationship through offset values. This allows the system to maintain precise time domain location identification even when operating with different subcarrier spacings for different channels.
2Adaptability or versatility
If subcarrier spacing of PUSCH occasion is made flexible and different from PRACH occasion, then the adaptability of the system increases, but the complexity of determining time domain location increases
Solution Approach 1:
The patent introduces an intermediary approach by using a reference subcarrier spacing and defined offset relationships to mediate between the PRACH occasion and PUSCH occasion with different subcarrier spacings. Instead of directly calculating time domain locations based on different subcarrier spacings (which would be complex), the patent uses the reference parameter as an intermediary to simplify the determination process while maintaining flexibility.
3Productivity
If a time offset is used to signal the time domain location of PUSCH occasion, then the signaling efficiency is improved, but the accuracy of time domain location determination deteriorates when subcarrier spacings differ
Solution Approach 1:
The patent resolves this contradiction by changing the parameter reference framework. Instead of using time offsets based on the PRACH occasion's subcarrier spacing (which causes accuracy loss when PUSCH uses different spacing), the patent defines time domain locations relative to a reference subcarrier spacing. This parameter change ensures that the offset-based signaling maintains its efficiency while preserving accuracy, as the offsets are now calculated based on a consistent reference that accounts for different PUSCH subcarrier spacings.
Data Source
AI summary
A terminal includes a receiving unit that receives, from a base station, a parameter for a random access procedure; a control unit that determines a time domain location of the PUSCH slot based on a time domain location of a Physical Random Access Channel (RACH) slot, subcarrier spacing of the RACH slot, subcarrier spacing of a Physical Uplink Shared Channel (PUSCH) slot, and the parameter; and a transmitting unit that transmits, at the determined time domain location, the PUSCH to the base station.