XDD Terminal PRACH Transmission via Frequency Domain Resources
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in expanding uplink coverage and reducing feedback delay, particularly in the context of cross-division duplex (XDD) technology, where efficient communication methods for XDD terminals are needed to optimize resource utilization and performance.
Innovation Solution
The proposed method involves a terminal and base station communication system where the terminal receives configuration information for time division duplex (TDD) and XDD, identifying valid physical random access channel (PRACH) occasions, and transmitting/receiving random access preambles accordingly, utilizing partial frequency resources to enhance uplink coverage and reduce feedback delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional TDD resource allocation is used, then downlink coverage is maintained, but uplink coverage is limited and feedback delay increases
Solution Approach 1:
The patent applies dimensionality change by introducing frequency domain resources for PRACH transmission within downlink slots. Instead of relying solely on time domain uplink slots, the invention utilizes frequency resources in the downlink direction, effectively adding a frequency dimension for random access. This resolves the contradiction by expanding uplink coverage through frequency resource utilization while maintaining TDD's inherent time division structure, thereby reducing feedback delay without compromising downlink coverage.
Solution Approach 2:
The patent segments the downlink slot into multiple frequency resources, designating specific frequency resources within downlink slots for PRACH transmission. This segmentation allows simultaneous downlink data transmission in other frequency resources while enabling uplink random access in designated frequency resources, thus expanding uplink coverage and reducing feedback delay without affecting overall downlink performance.
2Volume of moving object
If partial frequency resources in downlink slots are allocated for uplink, then uplink coverage expands, but resource configuration complexity increases
Solution Approach 1:
The patent introduces dynamic resource allocation where the network can flexibly configure frequency resources for PRACH transmission within downlink slots based on traffic conditions and system state. This dynamic approach allows the system to adapt resource allocation to actual needs, expanding uplink coverage when required while maintaining simple TDD operation during normal conditions, thus managing configuration complexity through adaptability.
Solution Approach 2:
The patent changes the parameter of frequency resource allocation by introducing frequencyDomainResources configuration that specifies which frequency resources within downlink slots are available for PRACH. This parameter change enables flexible control over frequency resource utilization, allowing the system to expand uplink coverage by adjusting frequency resource allocation without fundamentally changing the TDD framework, thereby managing configuration complexity through parameter-based control.
3Productivity
If frequency resources are reused for both downlink and uplink, then resource utilization improves, but interference management becomes more difficult
Solution Approach 1:
The patent segments frequency resources within downlink slots, allocating specific frequency resources for PRACH transmission while reserving other frequency resources for downlink data. This segmentation enables simultaneous downlink and uplink operations in the same time slot but in different frequency resources, improving resource utilization while managing interference through frequency separation. The network can control which frequency resources are allocated to minimize interference based on system conditions.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment of the present disclosure, a method performed by user equipment of a wireless communication system is provided. The method comprises the steps of: receiving, from a base station, first configuration information related to time division duplex (TDD), and second configuration information related to duplex in which some frequency resources corresponding to downlink time resources are used for an uplink; identifying at least one valid physical random access channel (PRACH) transmission occasion on the basis of the first configuration information and the second configuration information; and transmitting, on the basis of the at least one valid PRACH occasion, a random access preamble to the base station.