BBU Signal Combining for Multi-pRRU Uplink Coverage and Noise Control
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Solution Overview
Problem
The challenge in current communication technologies is the imbalance between uplink performance and cost, as increasing the number of pRRUs for radio frequency combination leads to higher noise floors and increased costs, while reducing pRRUs compromises coverage and capacity.
Innovation Solution
A communication method and device that involves grouping and combining signals in both time and frequency domains, and adjusting bandwidths to improve uplink performance without increasing the number of pRRUs, while supporting multiple RHUBs to enhance coverage area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the quantity of pRRUs is increased for radio frequency combination, then coverage area is improved, but noise floor increases and uplink performance deteriorates
Solution Approach 1:
The patent divides the signal processing into two domains: time domain for combining multiple pRRU signals, and frequency domain for bandwidth adjustment. This segmentation allows selective combination of signals in time domain while controlling noise through frequency domain filtering, resolving the contradiction between combining more signals for coverage and controlling noise floor for uplink performance
Solution Approach 2:
The patent transitions from single-domain signal processing to dual-domain processing (time domain for signal combination, frequency domain for bandwidth control). This dimensional approach enables simultaneous achievement of coverage expansion through multi-pRRU combination and uplink performance maintenance through frequency-selective noise control
2Reliability
If the quantity of pRRUs is reduced to lower noise floor, then uplink performance is improved, but coverage area and capacity are reduced
Solution Approach 1:
The patent merges signals from multiple pRRUs in the time domain to achieve coverage expansion, while simultaneously applying frequency domain filtering to control noise floor. This merging approach allows maintaining uplink performance by selectively combining only beneficial signal components across multiple pRRUs
3Reliability
If more BBUs are deployed to support fewer pRRUs, then uplink performance is maintained, but carrier costs increase
Solution Approach 1:
The patent makes existing BBUs multi-functional by enabling them to handle time-domain signal combination and frequency-domain bandwidth adjustment. This universality allows a single BBU to efficiently manage multiple pRRUs without requiring additional BBU deployments, thereby maintaining uplink performance while reducing carrier costs
Data Source
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AI summary
A communication method and device are provided, to resolve a problem in a current technology that uplink performance and low costs cannot be balanced when radio frequency combination is performed on uplink data of a plurality of pRRUs. The method includes: receiving, by a BBU, M groups of signals, where each group of signals includes N signals, M is an integer greater than 0, and N is a maximum quantity of signals supported when a physical cell of the BBU demodulates a signal; determining, by the BBU, H groups of signals that carry data and that are in the M groups of signals, where 0<H≤M; combining, by the BBU, the H groups of signals into one group of data; and demodulating, by the BBU, the combined group of data.