Random Access Preamble Transmission Diversity for Millimeter Wave Coverage
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Solution Overview
Problem
High-frequency wireless communication systems, particularly those using millimeter waves, face challenges in random access procedures due to the need for precise timing and physical properties, especially with the ubiquitous use of beamforming and small beams, which complicates coverage and speed of communication.
Innovation Solution
The method involves transmitting two shifted random access preambles using different antenna arrangements and frequency resources, allowing for transmission diversity and improved coverage by utilizing separate controllable antenna circuitry and configuring frequency resources for pseudo-orthogonality, particularly suitable for high-frequency operations like 6G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If beamforming with small beams is used in high-frequency wireless communication systems, then communication bandwidth and spectral efficiency are improved, but coverage area and access reliability deteriorate
Solution Approach 1:
The patent segments the random access procedure into multiple independent attempts using different antenna arrangements. The wireless device transmits preambles using different antenna configurations (first antenna arrangement, second antenna arrangement) to divide the access process into separate trials, increasing the probability of successful access while maintaining beamforming efficiency.
Solution Approach 2:
The patent introduces a temporal dimension to the antenna arrangements by shifting preambles relative to each other in time. The first and second preambles are transmitted at different time instances using different antenna configurations, adding a time dimension to the spatial beamforming approach, thereby improving coverage without sacrificing spectral efficiency.
2Reliability
If multiple antenna arrangements are used for random access preambles, then coverage and access probability are improved, but transmission time and procedure complexity increase
Solution Approach 1:
The patent implements periodic transmission of multiple preambles using different antenna arrangements. The wireless device transmits the first preamble using a first antenna arrangement, then transmits a second preamble using a second antenna arrangement in a periodic manner. This structured periodic approach allows systematic exploration of multiple antenna configurations without uncontrolled time consumption.
Solution Approach 2:
The patent performs preliminary actions by pre-configuring multiple antenna arrangements and preambles before the actual random access procedure. The wireless device is configured with multiple antenna arrangements and preambles in advance, allowing rapid sequential transmission without real-time computation delays, thus reducing overall procedure time.
3Adaptability or versatility
If shifted preambles are transmitted using different antenna arrangements, then transmission diversity and coverage are improved, but device complexity and configuration requirements increase
Solution Approach 1:
The patent makes the antenna arrangements universal by configuring them to serve multiple functions. The same antenna structure can be reused for different preamble transmissions with different shifts and configurations. The network node and wireless device both utilize the same set of antenna arrangements across different transmission instances, reducing overall system complexity while maintaining transmission diversity.
Data Source
AI summary
There is disclosed a method of operating a wireless device for a wireless communication network. The method includes transmitting a first random access preamble utilising a first antenna arrangement, and transmitting a second random access preamble utilising a second antenna arrangement, wherein the first random access preamble and the second random access preamble are shifted relative to each other. The disclosure also pertains to related devices and methods.