RACH Procedure for Location-Based Resource Allocation
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Solution Overview
Problem
Current wireless communications systems face challenges in efficiently supporting a wide range of devices with varying data traffic profiles, particularly in optimizing resource allocation for data transmissions in 5G systems, where devices may be located at different distances from infrastructure equipment and experience different channel conditions, leading to inefficiencies in resource usage.
Innovation Solution
The implementation of a hybrid, enhanced Random Access Channel (RACH) procedure that adapts resource allocation based on the location of communications devices within a cell, using reference signal received power (RSRP) thresholds to determine the appropriate modulation and coding scheme for uplink data transmissions, allowing for more efficient use of resources and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single modulation and coding scheme is used for all devices in a cell, then device complexity is reduced, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent divides the cell into multiple coverage areas with different RSRP thresholds, where each area is assigned a specific modulation and coding scheme. Devices select MCS based on their local position (signal strength), ensuring appropriate resource allocation without requiring complex device-side decisions. This resolves the contradiction by making MCS selection location-dependent rather than universally complex.
Solution Approach 2:
The cell coverage area is segmented into multiple regions based on RSRP thresholds, with each region associated with a specific MCS. This segmentation allows the system to apply different transmission parameters to different spatial zones, improving resource allocation efficiency while keeping device complexity low through threshold-based selection.
2Productivity
If location-based resource allocation is implemented, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The system provides RSRP thresholds and MCS mappings through system information broadcast, allowing devices to autonomously determine their coverage area and select appropriate MCS without complex network interaction. The device self-evaluates its signal strength against provided thresholds and automatically selects the corresponding MCS, reducing overall system complexity while maintaining efficiency.
Solution Approach 2:
The patent changes the parameter selection criterion from complex device characteristics to simple signal strength measurement (RSRP). By using RSRP thresholds as the basis for MCS selection, the system simplifies the decision-making process while maintaining location-based resource allocation efficiency.
3Measurement precision
If multiple RSRP thresholds are used to divide coverage areas, then resource allocation precision is improved, but system complexity increases
Solution Approach 1:
The patent implements a hierarchical threshold structure where devices evaluate RSRP against multiple thresholds but only need to find the first matching condition. This partial evaluation approach provides precise location-based MCS selection while limiting the computational burden, as devices don't need to evaluate all thresholds exhaustively.
Data Source
AI summary
A communications device comprising circuitry configured to transmit signals to infrastructure equipment via a wireless access interface provided by a wireless communications network, receive signals from the infrastructure equipment, receive an indication of one or more communications parameters from the infrastructure equipment, the indication of the one or more communications parameters comprising an indication of a plurality of reference signal received power, RSRP, thresholds, determine, based on the received indication of the one or more communications parameters, a location of the communications device with respect to a location of the infrastructure equipment, transmit a first signal comprising a random access preamble and uplink data to the infrastructure equipment, the uplink data being transmitted in a set of communications resources of the wireless access interface, the random access preamble being associated with the set of communications resources, and receive a random access response from the infrastructure equipment.