Base Station CoMP Transmission Mode Adaptation
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Solution Overview
Problem
In cellular networks, especially in cooperation areas, the distribution of user data over the backhaul with ultra short delay is a significant challenge, leading to potential delays in precoding coordinated multipoint transmission (CoMP) due to backbone overload, which can result in outdated channel state information and performance degradation.
Innovation Solution
A method that determines whether all user data required for CoMP is received by each base station, allowing a switch from precoding CoMP to interference alignment as a fallback mode when user data is delayed, thereby avoiding the need for data exchange between base stations and maintaining communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precoding CoMP transmission is used to improve performance gains through cooperation over different sites, then transmission quality is improved, but user data distribution delay over the backhaul increases causing outdated CSI and performance degradation
Solution Approach 1:
The system dynamically adapts the transmission mode based on backhaul availability conditions. When all eNBs receive user data in time, JP-CoMP is used for optimal performance. When user data arrives late at any eNB, the system switches to interference alignment transmission, which does not require user data distribution, thus avoiding performance degradation from outdated CSI.
Solution Approach 2:
The invention changes the transmission mode parameter based on the timing of user data arrival. By monitoring whether user data is received by all eNBs within the required time window, the system transitions between two distinct transmission modes: JP-CoMP (when data is available) and interference alignment (when data is not available), thereby adapting to backhaul conditions without sacrificing performance.
2Reliability
If over provisioning of the backhaul network is implemented to guarantee always delay, then transmission reliability is improved, but network cost increases
Solution Approach 1:
The invention creates a fallback transmission mode (interference alignment) that copies the essential function of data distribution-free transmission. Instead of requiring the backhaul to always deliver user data to all eNBs (over-provisioning), the system uses interference alignment as a copy of the transmission function that works with partial or delayed data arrival, thereby reducing backhaul capacity requirements.
3Reliability
If the time instance for eNBs to wait for user data is increased to improve data availability probability, then transmission reliability is improved, but CSI feedback outdating increases degrading performance
Solution Approach 1:
The system performs preliminary classification of transmission modes based on expected backhaul conditions. By having interference alignment transmission pre-configured as a fallback option, the system does not need to wait extended periods for user data arrival. Instead, it proactively switches to the appropriate mode based on whether user data arrives within the standard time window, preventing CSI outdating while maintaining data availability through the fallback mechanism.
Data Source
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AI summary
It is described a method for configuring a communication channel between a base station (101) and a user equipment (102) within a cellular network system (100), the cellular network system comprising a cooperation area (104), wherein the base station (101) and at least one further base station (103) are assigned to the cooperation area (104), wherein the user equipment (102) is served by the base station (101). The method comprises de- termining, by the base station (101), whether all user data of the user equipment (102) being required for a precoding coordinated multipoint transmission is received by each of the base station (101) and the at least one further base station (103), selecting a transmission mode, wherein the transmission mode is based, if all user data of the user equipment (102) being required for a precoding coordinated multipoint transmission is received by each of the base station (101) and the at least one further base station (103), on precoding coordinated multipoint transmission, or else, on an interference reducing transmission, and configuring, by the base station (101), the communication channel between the base station (101) and the user equipment (102) based on the selected transmission mode.