Terminal PRACH Repetition Using Distinct Root Sequences
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Solution Overview
Problem
Inappropriate PRACH repetition in the random access procedure can lead to deterioration of communication quality and inefficient resource utilization in radio communication systems, particularly in scenarios requiring coverage enhancement.
Innovation Solution
The proposed solution involves configuring distinct parameter values for root sequences and preambles for initial and repeated PRACH transmissions, defining additional ROs for PRACH repetition, and dynamically controlling PRACH repetition based on conditions such as RSRP and RRC configurations to avoid contention and optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PRACH repetition is performed using the same root sequence for multiple transmissions, then the implementation complexity is reduced, but communication quality deteriorates due to potential contention and interference
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the root sequence parameter for PRACH repetitions. Specifically, different root sequence indices are assigned to different PRACH transmission instances, which changes the sequence parameters to avoid contention and improve communication quality while maintaining manageable system complexity
2Reliability
If different parameter values are configured for each PRACH transmission, then communication quality improves by avoiding contention, but device complexity increases
Solution Approach 1:
The patent implements dynamics by dynamically determining root sequence indices based on transmission instance information. The base station configures multiple root sequence indices and the terminal selects appropriate indices for different PRACH repetitions, creating a dynamic adaptation mechanism that balances communication quality with implementation complexity
Solution Approach 2:
Different root sequence parameters are configured for different PRACH transmission instances. The patent specifies that the root sequence index can be determined based on the repetition number or other transmission characteristics, allowing parameter differentiation that improves communication quality while maintaining systematic control
3Reliability
If the number of available preambles is increased to more than 64, then the ability to support PRACH repetition without contention improves, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies segmentation by dividing the preamble resources into different groups or sets. Different root sequence indices correspond to different preamble groups, allowing the system to support multiple PRACH repetitions with differentiated resources. This segmentation enables contention avoidance while maintaining efficient resource utilization by organizing preambles in a structured manner
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a control section that configures a first parameter value used for generating a first root sequence for a first transmission of a random access channel, and either a second parameter value used for generating a second root sequence for a second transmission of the random access channel or a difference to the first parameter value, the second parameter value being a parameter value different from the first parameter value; and a transmission section that transmits the random access channel to a base station as the first transmission based on the first root sequence corresponding to the first parameter value, and transmits the random access channel to the base station as the second transmission based on the second root sequence corresponding to the second parameter value or the difference.