LAA Uplink Power Control via TPC Command Field
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Solution Overview
Problem
Current wireless communication systems face limitations in communication flexibility and efficiency, particularly in uplink license-assisted access (LAA) operations, where the existing designs do not adequately address the need for efficient power control and channel access procedures in LAA carriers.
Innovation Solution
The implementation of systems and methods that include a user equipment (UE) and evolved NodeB (eNB) configurations for LAA operations, utilizing advanced power control mechanisms and channel access procedures, such as transmit power control (TPC) and contention window adjustments, to optimize uplink transmissions in LAA cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If advanced power control mechanisms and channel access procedures are implemented in LAA operations, then communication flexibility and efficiency are improved, but device complexity and system configuration complexity increase
Solution Approach 1:
The patent implements dynamic parameter adjustments for power control in LAA operations, where transmit power levels, contention window sizes, and channel access parameters are continuously modified based on channel conditions, interference levels, and traffic requirements. This allows the system to adapt to changing environments without requiring complex structural changes to the base station or UE hardware architecture.
Solution Approach 2:
The system employs dynamic channel access procedures where UEs can transition between different access modes (contention-based random access and contention-free dedicated access) based on real-time channel conditions. The base station dynamically configures resource pools, power levels, and access parameters, enabling flexible adaptation to varying traffic loads and interference scenarios while maintaining manageable system complexity through standardized protocols.
2Adaptability or versatility
If transmit power control is optimized in LAA uplink transmissions, then communication flexibility is improved, but power consumption and energy management complexity increase
Solution Approach 1:
The patent implements dynamic parameter adjustments for power control in LAA operations, where transmit power levels, contention window sizes, and channel access parameters are continuously modified based on channel conditions, interference levels, and traffic requirements. This allows the system to adapt to changing environments without requiring complex structural changes to the base station or UE hardware architecture.
Solution Approach 2:
The system employs feedback mechanisms where UEs report channel quality indicators, interference measurements, and power headroom information to the base station. The base station uses this feedback to adjust transmit power commands, resource allocations, and channel access parameters, creating a closed-loop control system that optimizes power consumption while maintaining communication flexibility through adaptive responses to real-time conditions.
Data Source
AI summary
A user equipment (UE) is described. The UE may include a physical downlink control channel (PDCCH) receiver that is configured to detect multiple PDCCHs in a subframe i−K, the multiple PDCCHs including a first PDCCH. The UE may also include a physical uplink shared channel (PUSCH) transmitter that is configured to transmit multiple PUSCHs, the multiple PUSCHs being transmitted in a license-assisted access (LAA) cell, the multiple PUSCHs including a PUSCH which is scheduled by the first PDCCH, the PUSCH being transmitted in a subframe i. A transmit power of the PUSCH may be derived using a value indicated by a transmit power control (TPC) command field which is included in the first PDCCH.