Terminal Device Random Access Preamble Selection for 5G NR Interference Reduction
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Solution Overview
Problem
Current communication technologies in fifth-generation cellular systems face challenges in efficiently communicating between terminal apparatuses and base station apparatuses, particularly in reducing complexity and interference between cells and terminal apparatuses.
Innovation Solution
The implementation of advanced radio communication systems using New Radio (NR) technology, which includes efficient uplink transmission methods, modulation techniques, and coding schemes, along with beamforming and random access procedures to optimize communication efficiency and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of antenna elements are used in high frequency for massive MIMO, then coverage is secured with beamforming gain, but device complexity and interference management become more difficult
Solution Approach 1:
The patent segments the large number of antenna elements into multiple antenna groups, where each group is independently controlled and managed. This segmentation reduces the complexity of controlling individual antenna elements while maintaining the beamforming capabilities needed for coverage in massive MIMO systems.
2Productivity
If advanced NR technology with multiple features is implemented, then communication capacity and speed are improved, but system complexity increases
Solution Approach 1:
The patent implements universal uplink signal transmission procedures that can handle multiple scenarios (licensed and unlicensed cells, different transmission types) through a unified framework. This multi-functionality approach maintains high communication capacity while reducing system complexity by avoiding separate specialized procedures for each scenario.
3Reliability
If multiple uplink signal resources are attempted within a transmission window, then communication reliability is improved, but interference between terminal apparatuses increases
Solution Approach 1:
The patent implements feedback mechanisms where the base station provides information about successful signal receptions and resource usage status to terminal apparatuses. This feedback enables terminals to adjust their resource selection and transmission behavior, maintaining reliability through multiple transmission attempts while reducing interference by avoiding simultaneous transmissions on the same resources.
Data Source
Figure 1~1B
Figure 2
Figure 3
AI summary
A terminal apparatus (1, 1A, 1B) includes: a receiver (10) configured to receive preamble index information on a physical downlink control channel; and a transmitter (10) configured to, in a case where the preamble index information indicates a prescribed value, select a block from one or more blocks to transmit a random access preamble based on the block selected, and in a case where the preamble index information indicates a value other than the prescribed value, transmit the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein the block includes four OFDM symbols to which at least a synchronization signal and a physical broadcast channel are mapped.