Inactive UE RACH Data Transmission via Pre-configured Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing latency and optimizing battery consumption when user equipment (UE) communicates data in uplink or downlink directions while in an inactive state, as they require resource allocation, time, and power for state transitions.
Innovation Solution
The implementation of an inactive direct data transmission method using a random access channel (RACH) procedure, allowing data transmission up to a certain inactive data limit without transitioning to a connected state, along with differentiated RACH configurations and feedback mechanisms for successful transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE transitions from inactive state to connected state for data transmission, then data transmission reliability is improved, but transmission delay increases and battery consumption increases
Solution Approach 1:
The network pre-configures RACH resources and parameters for inactive state UEs before they need to transmit data. This includes configuring dedicated preambles, power control parameters, and resource allocations that are stored by the UE and can be immediately used when data transmission is needed, eliminating the need for extensive state transition procedures
Solution Approach 2:
The patent separates the random access procedure into distinct phases: inactive state direct transmission using pre-configured resources, and connected state transmission using dynamic resources. This segmentation allows UEs to handle small data packets efficiently in inactive state without full state transition, while reserving connected state for larger or more complex transmissions
2Reliability
If UE transitions from inactive state to connected state for data transmission, then data transmission reliability is improved, but battery consumption increases
Solution Approach 1:
Power control parameters, including pathloss reference values and transmission power settings, are pre-configured and stored by the UE in inactive state. When data transmission is needed, the UE can immediately use these pre-calculated parameters without performing power measurements and adjustments that would consume additional battery during state transition
Solution Approach 2:
The patent enables UEs to transmit data in inactive state using partial random access resources (dedicated preambles and pre-configured uplink grants) without completing the full connection establishment procedure. This partial action suffices for small data packets, consuming significantly less battery than full state transition while maintaining adequate transmission reliability
3Productivity
If dedicated RACH resources are allocated for inactive state transmission, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The dedicated RACH resources configured for inactive state UEs are designed to be multi-functional: the same preambles and resource configurations can be used for both small data transmissions in inactive state and for initial access in idle state. This universality reduces the need for entirely separate resource pools, thereby limiting the increase in device complexity while maintaining transmission efficiency improvements
Data Source
AI summary
Techniques discussed herein can facilitate inactive state transmissions for a User Equipment (UE) via a 4-step or 2-step inactive state RACH process. One example aspect is a UE device, comprising: communication circuitry; and a processor configured to perform operations comprising: in response to a determination to perform a Radio Resource Control (RRC) inactive data transmission: transmitting, via the communication circuitry, a message 1 (Msg1) or a message A (MsgA) preamble based on a Random Access Channel (RACH) configuration for the RRC inactive data transmission; transmitting, via the communication circuitry a message 3 (Msg3) or a MsgA Physical Uplink Shared Channel (PUSCH) comprising uplink (UL) data via configured resources; and receiving, via the communication circuitry, a message 4 (Msg4) or a message B (MsgB) in response to the Msg3 or the MsgA PUSCH.