RRU Selection for LTE Resource Scheduling
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Solution Overview
Problem
The multi-RRU joint transmission manner in LTE systems experiences severe system throughput loss when serving multiple users, due to inefficient resource reuse among base stations.
Innovation Solution
A method and device that determine the optimal Remote Radio Unit (RRU) for resource scheduling based on interference strength information, selecting a second RRU when using a dedicated reference signal and a third RRU when not using it, to improve resource allocation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-RRU joint transmission is used to reduce interference, then cell-edge SINR is improved, but system throughput is severely lost when service volumes of multiple users are sufficient
Solution Approach 1:
The patent segments the resource allocation process into two distinct paths based on terminal conditions: one path for terminals using DRS demodulation (utilizing multiple RRUs) and another path for terminals without DRS (utilizing a single RRU). This segmentation allows the system to apply different resource allocation strategies to different terminal types, thereby improving overall system throughput while maintaining cell-edge SINR performance.
Solution Approach 2:
The patent implements dynamic resource allocation by allowing RRUs to be dynamically selected based on terminal-specific conditions (DRS usage, signal strength, quality metrics). The RRU selection is not fixed but adapts to each terminal's characteristics and channel conditions, enabling the system to optimize throughput for users with sufficient service volumes while maintaining interference coordination for cell-edge users.
2Object-affected harmful factors
If resource is not reused among all RRUs in multi-RRU joint transmission, then interference between cells is reduced, but resource utilization efficiency is poor
Solution Approach 1:
The patent applies local quality by allowing different resource allocation strategies for different terminals within the same cell. Terminals with sufficient service volumes and good channel conditions can utilize resource reuse across multiple RRUs, while cell-edge terminals or those with poor conditions receive dedicated resources from a single RRU. This localized differentiation optimizes both interference management and resource utilization efficiency.
Solution Approach 2:
The patent changes the resource allocation parameters dynamically based on terminal conditions such as DRS usage, uplink signal strength, downlink quality, and uplink quality. By adjusting these parameters adaptively, the system achieves better resource utilization efficiency while maintaining interference coordination where necessary.
3Reliability
If multi-RRU joint transmission is used for all terminals, then cell-edge service experience is improved, but complexity of resource scheduling increases
Solution Approach 1:
The patent segments the terminal population into different categories based on their demodulation capabilities and channel conditions. This segmentation simplifies the resource scheduling complexity by providing clear decision rules: terminals using DRS follow one scheduling path, while terminals without DRS follow another. This reduces the computational burden compared to uniform multi-RRU joint transmission for all terminals.
Solution Approach 2:
The patent enables terminals to self-identify their service needs and conditions (through reporting DRS usage, signal strength, and quality metrics), allowing the base station to automatically select appropriate RRUs without complex centralized optimization. This self-service mechanism reduces scheduling complexity while maintaining service quality.
Data Source
AI summary
Embodiments of the present invention relate to a method and device for determining RRU. The method includes: a BBU obtains interference strength information of a terminal, where the interference strength information includes a downlink mode of the terminal. The method further includes: if demodulation is performed by using a dedicated reference signal (DRS) in the downlink mode, the BBU performs resource scheduling on the terminal by using a second RRU, where the second RRU is selected by the BBU from multiple first RRUs that serve the terminal; or if demodulation is performed without using a DRS in the downlink mode, the BBU performs resource scheduling on the terminal by using a third RRU, where the third RRU is determined by the BBU according to any one of an uplink signal strength value of the terminal, a downlink quality value of the terminal, or an uplink quality value of the terminal.