Reconfiguring Preconfigured Uplink Resources for Network Flexibility
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Solution Overview
Problem
In reduced capability new radio (NR) devices, pre-configured uplink resources can reduce network flexibility, making it complex and time-consuming to accommodate other users, especially in congested scenarios, due to persistent uplink traffic from devices like industrial sensors or video surveillance sensors, which limits spectral efficiency and adaptability to changing radio conditions.
Innovation Solution
A UE and base station system that allows uplink data transmission in an RRC inactive state using pre-configured uplink resources, with the ability to fallback to random access channel transmission mode upon failure, and reconfigure parameters such as resource allocation, beam direction, and transmission power to optimize spectral efficiency and adapt to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-configured uplink resources are allocated to reduced capability UEs for persistent uplink traffic, then uplink transmission reliability is improved, but network flexibility and spectral efficiency deteriorate due to inability to accommodate other users
Solution Approach 1:
The patent implements dynamic reconfiguration of pre-configured uplink resources by introducing RRC release messages that can modify resource parameters (time, frequency, spatial domain) and activation/deactivation mechanisms. This allows the network to adapt pre-configured resources to changing traffic patterns and radio conditions while maintaining reliability for reduced capability UEs.
Solution Approach 2:
The patent changes resource parameters dynamically by allowing the network to reconfigure time domain, frequency domain, and spatial domain parameters of pre-configured uplink resources. This enables the same resource allocation to serve different purposes at different times, improving both reliability and network flexibility.
2Ease of operation
If pre-configured uplink resources are allocated to reduced capability UEs, then uplink transmission is simplified, but network congestion worsens due to reduced ability to multiplex other UEs
Solution Approach 1:
The patent introduces dynamic activation and deactivation of pre-configured resources based on network conditions. When congestion is detected, the network can deactivate resources for reduced capability UEs or reconfigure them to different time/frequency slots, thereby maintaining simple uplink transmission for individual UEs while improving overall network spectral efficiency.
Solution Approach 2:
The patent implements periodic reconfiguration opportunities where the network can update pre-configured resource parameters at scheduled intervals. This allows the system to maintain simple periodic uplink transmission for reduced capability UEs while periodically optimizing resource allocation to alleviate network congestion and improve spectral efficiency.
3Reliability
If pre-configured resources are occupied by reduced capability UEs, then uplink connectivity is maintained, but network response time to accommodate other users increases
Solution Approach 1:
The patent pre-configures uplink resources for reduced capability UEs during RRC connection establishment or resumption, allowing immediate uplink transmission without waiting for dynamic resource allocation. This preliminary configuration maintains uplink connectivity while enabling the network to later reconfigure or reallocate resources quickly when other users need to be accommodated.
Solution Approach 2:
The patent implements dynamic resource reconfiguration mechanisms that allow the network to quickly modify or release pre-configured resources in response to changing network conditions. This dynamic approach maintains connectivity for reduced capability UEs while reducing the time penalty when resources need to be reallocated to other users.
Data Source
AI summary
A user equipment (UE) apparatus for wireless communication with a base station is provided. The UE includes a transceiver and a processor. The processor is configured to transmit, to the base station, via the transceiver, at least one uplink (UL) data packet in a radio resource control (RRC) inactive state, and in response to a UL transmission failure, fall back to a random access channel (RACH) transmission mode, and receive, from the base station, via the transceiver, a message indicating the UE to change from the RACH transmission mode to a configured grant-based transmission mode.