Static PUSCH Configuration for O-RAN Two-Step Random Access
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Solution Overview
Problem
The current O-RAN specification lacks support for static configuration of a PUSCH transmission in the two-step random access procedure, leading to increased signaling overhead and bandwidth usage in the fronthaul between the distributed unit (DU) and the radio unit (RU).
Innovation Solution
The proposed solution involves the RU transmitting a static configuration support indication to the DU, allowing the DU to transmit static configuration information for statically configuring the RU to receive payload data via the message A in the two-step random access procedure, reducing the need for dynamic configuration and conserving bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic configuration is used for PUSCH transmission in two-step random access procedure, then adaptability is improved, but signaling overhead and bandwidth usage increase
Solution Approach 1:
The patent applies preliminary action by configuring the RU with static parameters before the random access procedure. The DU provides the RU with predetermined configuration information including time resources, frequency resources, and modulation coding scheme before the actual PUSCH transmission occurs. This eliminates the need for dynamic signaling during the random access procedure, reducing signaling overhead while maintaining adaptability through pre-configured parameters that can be adjusted during setup.
2Adaptability or versatility
If dynamic configuration is used for PUSCH transmission, then flexibility is improved, but bandwidth usage in fronthaul increases
Solution Approach 1:
The patent implements preliminary action by establishing all necessary configuration parameters before the random access procedure executes. The DU configures the RU with time resources, frequency resources, and modulation coding scheme in advance, eliminating the need for real-time dynamic signaling during the procedure. This pre-configuration approach reduces the bandwidth required in the fronthaul connection between DU and RU while preserving flexibility through pre-established configuration frameworks.
3Quantity of substance
If static configuration is implemented for PUSCH transmission, then signaling overhead is reduced, but configuration flexibility is limited
Solution Approach 1:
The patent resolves this contradiction by applying preliminary action during the configuration setup phase. All necessary parameters including time resources, frequency resources, and modulation coding scheme are predetermined and configured in advance. This allows the system to use static configuration during the random access procedure, reducing signaling overhead, while maintaining configuration flexibility through the pre-established parameter framework that can be adjusted during the initial setup without requiring dynamic signaling during execution.
Data Source
AI summary
An open radio access network (O-RAN) may include a control unit that communicates with a core network, a distributed unit that communicates with the control unit, a radio unit that communicates with the distributed unit and a user equipment (UE). Currently, the O-RAN may lack support for static configuration for a physical uplink shared channel (PUSCH) communication of message-A in a third generation partnership project (3GPP) two-step random access procedure. Hence, according to some aspects of the disclosure, the distributed unit may receive, from a radio unit, a static configuration support indication for receiving payload data via a message in a two-step random access procedure, the message including a preamble and the payload data. The distributed unit may further transmit, in response to receiving the static configuration support indication, static configuration information to the radio unit, the static configuration information for receiving the payload data communicated via the message.