Grant-Free Access Power Control for Uplink Interference Management
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Solution Overview
Problem
In communication systems with a large number of terminal apparatuses, conventional non-orthogonal multiple access technologies face challenges in managing interference, leading to degraded throughput when interference cannot be effectively removed or suppressed.
Innovation Solution
A terminal and base station apparatus configuration that distinguishes between grant-free and scheduled access resources, using specific transmission power control information for each, and applies random power offsets in grant-free access to optimize transmission power and request scheduled access when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-orthogonal multiple access is used to allow interference between terminal apparatuses, then transmission capacity is increased, but interference signal removal or suppression becomes difficult when interference is too large, degrading throughput
Solution Approach 1:
The patent segments the uplink transmission resources into two distinct types: grant-free access resources for initial transmissions and scheduled access resources for retransmissions. This segmentation allows the system to exploit non-orthogonal multiple access benefits for initial transmissions while ensuring reliable delivery through scheduled retransmissions, thereby resolving the throughput degradation caused by excessive interference
Solution Approach 2:
The patent implements dynamic transmission power control where the base station adjusts transmission power parameters based on channel conditions and interference levels. The base station determines appropriate transmission power for grant-free access and notifies terminal apparatuses, enabling adaptive power management that optimizes throughput while managing interference dynamically
2Reliability
If transmission power is increased to improve signal quality, then communication reliability is improved, but interference to other terminal apparatuses increases, degrading overall system throughput
Solution Approach 1:
The patent changes the transmission power parameter dynamically based on access type and channel conditions. For grant-free access, the terminal uses pre-configured power parameters, while for scheduled access, the base station provides specific power control commands. This parameter adjustment ensures reliable communication at appropriate power levels without causing excessive interference to other users
Solution Approach 2:
The patent implements a feedback mechanism where the base station receives uplink signals from terminal apparatuses, evaluates channel conditions and interference levels, and sends back transmission power control information for scheduled access. This closed-loop feedback enables the system to maintain communication reliability while adapting transmission power to minimize overall system interference
Data Source
AI summary
To improve throughput in a communication environment in which a large number of terminal apparatuses access, a receiver receives information indicating whether a radio resource allocated by a base station apparatus is a grant free access resource or a scheduled access resource, as well as transmission power control information in the scheduled access resource and transmission power control information in the grant free access resource; and a transmitter configured to transmit a transmission signal to the base station apparatus. In a case of communicating by using the scheduled access resource, a transmission power control is performed based on the first transmission power control information to transmit the transmission signal. In a case of communicating by using the grant-free access resource, the transmission power control is performed based on the second transmission power control information to transmit the transmission signal.