Inactive UE Direct Uplink via Dedicated CFRA Resources
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Solution Overview
Problem
The existing random access channel (RACH) process for user equipment (UE) in inactive states introduces significant delay before uplink data can be transmitted, as it requires transitioning to the connected state, which is inefficient and increases latency.
Innovation Solution
The implementation of a contention-free random access (CFRA) process allows user equipment (UE) to perform direct uplink transmission using a dedicated physical random access channel (PRACH) or preamble resource while remaining in the inactive state, eliminating the need for a transition to the connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing RACH process requires UE to transition to connected state for uplink data transmission, then the UE can establish synchronization and obtain network resources, but significant delay is introduced before data transmission can occur
Solution Approach 1:
The network configures dedicated PRACH resources and preambles for the UE in advance while the UE is in inactive state. This preliminary configuration allows the UE to immediately perform uplink data transmission without transitioning to connected state, thus reducing latency while maintaining the ability to establish synchronization when needed.
Solution Approach 2:
The patent extracts the essential function of uplink data transmission from the connected state requirement. By allowing UE to transmit data directly from inactive state using pre-configured resources, the solution separates the data transmission function from the state transition requirement, eliminating unnecessary delay while preserving synchronization capabilities.
2Quantity of substance
If the UE transitions to connected state for uplink data transmission, then network resources can be obtained, but the complexity of the process increases and efficiency decreases
Solution Approach 1:
The network performs preliminary configuration of PRACH resources and preambles before the UE needs to transmit data. This advance preparation stores necessary network resources and configuration information in the UE's inactive state, eliminating the need for complex state transitions and resource allocation procedures during actual data transmission.
Solution Approach 2:
The UE utilizes pre-configured dedicated PRACH resources and preambles stored from previous network configuration. By self-serviceing with these pre-allocated resources, the UE can perform uplink transmission without engaging in complex resource request and allocation procedures, thereby reducing process complexity while maintaining resource availability.
Data Source
AI summary
Systems, methods, and circuitries are provided for direct transmission of uplink data by an INACTIVE UE using a contention free random access (CFRA) process. In one example, a method, includes, receiving, from a network, configuration of a dedicated physical random access channel (PRACH) resource or a dedicated preamble resource (dedicated PRACH/preamble resource); and while in a radio resource control (RRC) INACTIVE state, without entering an RRC CONNECTED state, using a contention-free random access (CFRA) process to transmit uplink data to a base station using the dedicated PRACH/preamble resource.