Random Access Resource Sets for Millimeter Wave Beam Management
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Solution Overview
Problem
High-frequency millimeter wave (mmW) frequencies used in next-generation cellular communication systems face challenges such as high free space path loss, attenuation by rainfall and atmospheric gases, and depolarization, which affect wireless communication, especially in outdoor environments, making it difficult for evolved node B (eNB) to deliver cell-specific or broadcast information effectively.
Innovation Solution
Implementing multi-angle of arrival (AoA) reception methods by providing random access (RA) resource sets to small cell mmW eNB, allowing wireless transmit/receive units (WTRUs) to select and use multiple RA resource sets associated with different node-B directional beams for improved signal transmission and reception, enabling sequential or parallel transmissions to mitigate radio link interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow beam patterns are used to counter path loss at above-6 GHz frequencies, then signal transmission reliability is improved, but the ability to deliver cell-specific or broadcast information deteriorates
Solution Approach 1:
The patent segments the random access procedure into multiple beam-specific resource sets, where each resource set is associated with a specific beam direction. This allows the system to maintain narrow beams for reliable user-specific communication while providing separate resources for broad coverage cell-specific information delivery.
Solution Approach 2:
The patent introduces a spatial dimension to the random access resource allocation by associating different resource sets with different beam directions. This multi-dimensional approach enables simultaneous support for both narrow-beam reliable transmission and broad-beam broadcast information delivery.
2Adaptability or versatility
If multiple RA resource sets are provided for different beam directions, then coverage and adaptability are improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple beam-specific random access resource sets in advance, associated with different beam directions. This allows the WTRU to efficiently select appropriate resources without complex real-time calculations, reducing device complexity while maintaining broad coverage and adaptability.
3Reliability
If sequential RA transmissions are performed using multiple preambles, then reliability against radio link interruptions is improved, but loss of time increases
Solution Approach 1:
The patent implements periodic action through sequential random access transmissions, where multiple preambles are transmitted in a predetermined sequence across different beam directions. This structured periodic approach ensures reliable delivery despite radio link interruptions while optimizing the time required for successful access.
Data Source
AI summary
Methods, devices and systems are provided for performing a random access (RA) procedure. A wireless transmit/receive unit (WTRU) may be configured to receive RA resource sets, where each of the RA resource sets is associated with a node-B directional beam, select an RA resource set from among the RA resource sets, and initiate an RA procedure based on the selected RA resource set. The RA procedure may include selecting multiple preambles which include a preamble for each resource of a plurality of resources corresponding to the selected RA resource set. The WTRU may be configured to sequentially transmit the selected multiple preambles in sequential RA transmissions, and may be configured to receive, from a node-B, in response to the RA transmissions, at least one RA response (RAR), where each of the received at least one RAR corresponds to one of the transmitted multiple preambles.