Cell-Specific Uplink Configuration for Two-Step Random Access
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Solution Overview
Problem
Current wireless communications networks face challenges in efficiently supporting a wide range of devices with varying data traffic profiles and characteristics, particularly in optimizing resource allocation for uplink data transmissions in random access procedures, especially for devices in different locations and RRC states within the network.
Innovation Solution
The implementation of infrastructure equipment that provides location-based uplink data transmission configurations, adapting parameters such as modulation and coding schemes, transmission power, and resource allocation based on the device's location and RRC state to optimize the two-step RACH procedure, reducing inefficiencies in resource allocation for devices at the cell edge or experiencing poor channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If location-based uplink data transmission configurations are implemented, then uplink data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The infrastructure equipment pre-determines and stores multiple uplink data transmission configurations corresponding to different locations before actual data transmission occurs. When a device needs to transmit uplink data, the infrastructure equipment simply retrieves the appropriate pre-configured configuration based on the device's location, avoiding complex real-time calculations and decision-making processes.
Solution Approach 2:
The system dynamically selects different uplink data transmission configurations based on the real-time location of communication devices. The infrastructure equipment adjusts transmission parameters such as modulation schemes, coding rates, and power levels according to location-specific channel conditions, enabling adaptive optimization without requiring complex real-time processing.
2Productivity
If multiple uplink data transmission configurations are provided for different locations, then resource allocation optimization is improved, but signaling overhead increases
Solution Approach 1:
The uplink data transmission configurations are segmented into multiple location-specific sets, where each configuration is tailored for particular geographic areas or cell regions. This segmentation allows the system to provide optimized parameters for different locations while keeping each individual configuration relatively simple and manageable.
Solution Approach 2:
Different uplink data transmission configurations are provided for different locations based on local channel conditions. Each location receives customized configuration parameters optimized for its specific environment, such as edge-of-cell versus center-of-cell conditions, rather than using a single uniform configuration for all devices.
3Reliability
If RRC state-dependent configurations are used, then connectivity maintenance for inactive devices is improved, but control complexity increases
Solution Approach 1:
The system pre-configures different uplink data transmission parameters for devices in different RRC states (e.g., idle, inactive, connected) before actual data transmission. This allows the infrastructure equipment to quickly determine the appropriate configuration based on the device's current state without requiring complex real-time state analysis or decision-making.
4Reliability
If location-based configurations are implemented for cell edge devices, then transmission reliability is improved, but processing time increases
Solution Approach 1:
Location-based uplink data transmission configurations are determined and stored in advance for different geographic areas including cell edge regions. When a device needs to transmit data, the infrastructure equipment simply retrieves the pre-determined configuration corresponding to the device's location, eliminating the need for time-consuming real-time analysis of channel conditions and device capabilities.
Data Source
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AI summary
An infrastructure equipment forming part of a wireless communications network for transmitting data to or receiving data from a plurality of communications devices is provided. The infrastructure equipment providing a cell having a coverage area in which the plurality of communications devices are located. The infrastructure equipment comprises transmitter circuitry configured to transmit signals to the communications devices via a wireless access interface provided by the wireless communications network, receiver circuitry configured to receive signals from the communications devices via the wireless access interface, and controller circuitry configured in combination with the receiver circuitry and the transmitter circuitry to transmit to the plurality of communications devices an indication of one or more of a plurality of uplink data transmission configurations, the uplink data transmission configurations each defining different values of a set of one or more communications parameters in accordance with which the plurality of communications devices are to transmit uplink data to the infrastructure equipment, to receive a first signal comprising a random access preamble and uplink data from one of the communications devices, and to transmit a random access response message to the one of the communications devices. The one or more of the plurality of uplink data transmission configurations defining the values of the communications parameters in accordance with which the uplink data of the first signal is received by the infrastructure equipment is dependent on a distance between the one of the communications devices and the infrastructure equipment.