Multi-TRP Beam Signaling for Reliable 2-Step Random Access
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Solution Overview
Problem
Existing 2-step RACH procedures in wireless communication systems face reliability and latency issues due to potential misalignment or blockage of selected SSB beams, leading to repeated transmissions and increased power consumption and network interference.
Innovation Solution
Incorporating information about preferred beams from multiple TRPs in the MsgA transmission, allowing simultaneous or diverse MsgB transmissions from different TRPs or beams to enhance reliability and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a user equipment transmits uplink data and a downlink data notification simultaneously, then the transmission efficiency is improved, but the buffer status information becomes inaccurate due to flushing the uplink data buffer
Solution Approach 1:
The notification message is segmented into multiple parts: original notification information, first indication information (buffer flushing status), and second indication information (data transmission status). This segmentation allows the system to convey multiple pieces of information in a single message without losing accuracy, resolving the contradiction between transmission efficiency and buffer status accuracy.
Solution Approach 2:
The indication information is nested within the notification message structure. The first indication information and second indication information are embedded as additional fields within the existing notification framework, allowing efficient transmission while preserving detailed buffer status information. This nesting approach maintains transmission efficiency while improving measurement precision.
2Productivity
If the network device allocates resources based on inaccurate buffer status information, then resource allocation efficiency improves, but uplink data transmission reliability deteriorates
Solution Approach 1:
The system implements feedback by including indication information in the notification message that reflects the actual buffer status and data transmission state. This feedback mechanism allows the network device to make accurate resource allocation decisions based on real-time buffer status, thereby improving both resource allocation efficiency and uplink data transmission reliability simultaneously.
3Speed
If the uplink data buffer is flushed to enable simultaneous transmission, then the transmission speed is improved, but the loss of uplink data increases
Solution Approach 1:
The system performs preliminary action by allocating resources in advance based on the indication information received in the notification message. This allows the network device to prepare resource allocation before the actual data transmission occurs, enabling fast transmission without flushing the buffer, thus improving transmission speed while preventing data loss.
Solution Approach 2:
The indication information acts as an intermediary that carries buffer status and transmission state information from the user equipment to the network device. This intermediary mechanism enables the network device to make informed resource allocation decisions without requiring buffer flushing, thereby achieving fast transmission while preserving uplink data.
Data Source
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AI summary
A method comprises causing a message to be transmitted from a communications device to a transmission reception point during a random access procedure. The message comprises information identifying a plurality of different beam directions. The method further comprises receiving a response to the message from a plurality of different beam directions.