Inactive-State Small Data Transfer Across Disaggregated Base Stations
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Solution Overview
Problem
In wireless communications systems, devices in an inactive state face inefficiencies and increased latency due to frequent random access procedures for small data transmissions, particularly when moving between network nodes, leading to unnecessary signaling overhead and resource expenditure.
Innovation Solution
User equipment (UE) can transmit small data directly to a disaggregated base station without performing a random access procedure, using routing identifiers and data radio bearers to maintain an inactive state, allowing for efficient uplink data transmission and monitoring for downlink data without relocation procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs random access procedure for small data transmissions in inactive state, then the data can be transmitted to the network, but signaling overhead and latency increase
Solution Approach 1:
The network performs preliminary actions by configuring the UE with uplink resources, routing identifiers, and data radio bearer configurations before the UE enters inactive state. This pre-configuration enables the UE to transmit small data directly in inactive state without performing random access procedure, thereby reducing latency while maintaining reliable data transmission capability
Solution Approach 2:
Routing identifiers act as intermediaries that enable the network to identify and route small data transmissions from UEs in inactive state to the appropriate network nodes. These identifiers allow direct data transmission without requiring the UE to re-establish full connectivity through random access, thus reducing signaling overhead and latency
2Reliability
If a UE performs random access procedure for small data transmissions, then data can be sent to the network, but signaling overhead increases
Solution Approach 1:
The network performs preliminary configuration of uplink resources, routing identifiers, and data radio bearers before the UE enters inactive state. This pre-configuration eliminates the need for random access procedure and associated signaling exchanges, thereby reducing signaling overhead while maintaining data transmission capability
Solution Approach 2:
The invention extracts the essential data transmission functionality from the complete random access procedure. By separating small data transmission from the full connection establishment process, the system eliminates unnecessary signaling steps while preserving the core capability to transmit data reliably
3Use of energy by moving object
If the UE remains in inactive state for small data transmission, then power and computational resources are saved, but the UE must maintain routing information
Solution Approach 1:
The network provides preliminary configuration including routing identifiers and data radio bearer information before the UE enters inactive state. The UE stores this configuration information locally, enabling it to transmit small data without transitioning to connected state. This approach saves power while the UE maintains only essential routing information rather than full connection state
Solution Approach 2:
The UE uses its own stored configuration information (routing identifiers, uplink resources, data radio bearer settings) to autonomously transmit small data while in inactive state. This self-service capability allows the UE to perform data transmission without network assistance or state transition, thereby conserving power and computational resources
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may directly send small data to a disaggregated base station without performing a random access procedure. The CU-CP may provide a list of routing identifiers and corresponding data resource bearers (DRBs) to a distributed unit (DU) and the DU may transmit a connection release message to the UE. The connection release message may include the list of routing identifiers and the list of DRB identifiers. The connection release message may also include a downlink monitoring timer. The UE may identify data for an uplink transmission and a DRB associated with that data. The UE may transmit a packet with the data and the routing identifiers to a DU, which may derive downlink address information from the routing identifiers and forward the data to a CU-UP of the aggregated base station.