MCE Downlink Power Control for Multicast Broadcast Services
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Solution Overview
Problem
Current wireless communication networks lack efficient downlink power control for multicast or broadcast services provided by multiple radio base stations, leading to energy inefficiency as eNodeBs transmit with constant powers, even if not all UEs require the same transmission levels.
Innovation Solution
Implementing a Multicast Coordination Entity (MCE) that collects path-loss attenuations between radio base stations and terminal devices to calculate optimized transmission powers, minimizing the sum of transmission powers while ensuring adequate reception powers at each UE, thereby improving energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eNodeBs transmit with constant powers for multicast or broadcast services, then all UEs can receive adequate signals, but energy efficiency deteriorates due to unnecessary high transmission powers
Solution Approach 1:
The patent implements dynamic transmission power control where the MCE adjusts the transmission power of each eNodeB based on real-time path-loss measurements reported by UEs. Instead of using constant transmission powers, the system continuously adapts power levels to match actual channel conditions, thereby reducing energy consumption while maintaining adequate signal reception quality for all UEs in the MBSFN area
Solution Approach 2:
The system establishes a feedback mechanism where UEs measure the reference signal received power (RSRP) from eNodeBs and report path-loss values to the MCE. The MCE uses this feedback information to calculate and adjust the optimal transmission power for each eNodeB, creating a closed-loop control system that balances energy efficiency with reliable service delivery
2Use of energy by moving object
If transmission powers are reduced to improve energy efficiency, then energy consumption decreases, but signal reception quality at distant UEs deteriorates
Solution Approach 1:
The patent applies local quality by assigning different transmission power levels to different eNodeBs based on their specific channel conditions and the path-loss characteristics to various UEs. Each eNodeB transmits at a power level optimized for its local coverage area and the specific UEs it serves, rather than using a uniform power level across all eNodeBs. This localized optimization maintains adequate reception quality for each UE while minimizing total energy consumption
Data Source
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AI summary
The present disclosure provides a method implemented in an MCE for performing downlink power control for a multicast or broadcast service which is collectively provided from a number (N≥2) of radio base stations (BSi, i＝1,..., N) to a number (M≥2) of terminal devices (UEj, j＝1,..., M). The method comprises collecting path-loss attenuations (cji, i＝1,..., N; j＝1,..., m (m≤M) ) between the radio base stations (BSi,i＝1,..., N) and all or a subset of the terminal devices (UEj, j＝1,..., m (m≤M) ). The method further comprises calculating transmission powers (P mbsfn T i,i＝1,..., N) for the radio base stations (BSi, i＝1,..., N) based on the collected path-loss attenuations (cji, i＝1,..., N; j＝1,..., m), such that a sum of the transmission powers (∑) is minimized under a set of constraints on reception powers at said all or said subset of the terminal devices (UEj, j＝1,..., m (m≤M) ). Each of the radio base stations (BSi, i＝1,..., N) is notified of a corresponding one of the calculated transmission powers (P mbsfn T i,i＝1,..., N). The present disclosure also provides an MCE for performing downlink power control for a multicast or broadcast service.