Base Station MUST Coordination via Backhaul
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting data to multiple users using Multi User Superposition Transmission (MUST) and Multiple Input Multiple Output (MIMO) techniques, particularly due to cross-layer interference and unequal signal-to-noise ratios (SNRs) among users.
Innovation Solution
The implementation of a wireless communication network that utilizes MUST and MIMO techniques, with coordinated multi-point (CoMP) transmission, to negotiate MUST settings between base stations via backhaul interfaces, and apply predistortion to mitigate cross-layer interference. Additionally, the system alternates layer mapping between users to maintain consistent data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Multi User Superposition Transmission (MUST) is used to transmit data to multiple users, then data transmission capacity and data rates are improved, but cross-layer interference between users increases
Solution Approach 1:
The patent applies predistortion techniques at the transmitter side to pre-compensate for cross-layer interference before transmission. By calculating the expected interference between superimposed user signals and applying opposite distortion, the system proactively counteracts the harmful interference effects, allowing multiple users to share the same time-frequency resources with reduced mutual interference
Solution Approach 2:
The patent dynamically adjusts transmission parameters including power allocation ratios between different users, modulation schemes, and coding rates based on channel conditions and user requirements. By changing these parameters adaptively, the system optimizes the superposition transmission to maximize capacity while controlling interference levels among users
2Productivity
If MUST settings are negotiated between base stations via backhaul interfaces, then coordinated multi-point transmission efficiency is improved, but system complexity and processing time increase
Solution Approach 1:
The patent performs channel estimation, interference prediction, and transmission parameter optimization in advance before actual data transmission. By preparing MUST settings and coordination information beforehand through backhaul interfaces, the system reduces real-time processing requirements and enables faster coordinated transmission execution
Solution Approach 2:
The patent introduces a coordination mechanism where base stations exchange MUST configuration information and channel state information through backhaul interfaces. This intermediary communication layer enables centralized or distributed coordination of multi-point transmissions, allowing base stations to share user channel information and coordinate their transmissions to reduce interference and improve overall system efficiency
3Reliability
If layer mapping is alternated between users, then data rate consistency is improved, but processing overhead increases
Solution Approach 1:
The patent implements periodic switching of layer mapping between users in a structured manner. By alternating which user receives which spatial layer in a predetermined pattern, the system ensures that users with equal or unequal signal-to-noise ratios receive equitable service over time, maintaining data rate consistency while using systematic processing procedures to minimize overhead
Data Source
AI summary
A base station for a wireless communication network includes a plurality of base stations, each base station to serve one or more users. One or more users are served by a plurality of base stations to receive a first data signal from the base station and a second data signal from at least one further base station using multi-user superposition transmission, MUST. The base station includes a backhaul interface for a communication with one or more of the plurality of base stations of the wireless communication network. For transmitting the first data signal to one or more users served by the base station and by the further base station, the base station is configured to negotiate a MUST setting with the further base station via the backhaul interface, and map data of the first data signal using a first transmit constellation set according to the negotiated MUST setting.