UL CoMP Inter-Point Data Exchange via Subband Selection
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Solution Overview
Problem
In CoMP scenarios, the high transport network capacity requirements for inter-point data exchange in UL CoMP limit the deployment of UL CoMP features, especially in dense urban areas where existing wired transport networks provide insufficient bandwidth, forcing operators to switch off or limit UL CoMP to conserve bandwidth.
Innovation Solution
A data exchange method where a predetermined number of subbands with the best channel quality are selected and transmitted from assistant points to the converging point for co-processing, reducing the transport network capacity requirements while maintaining a good UL CoMP gain by prioritizing data with the best channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all user data from assistant points is transmitted to the converging point for co-processing, then UL CoMP gain is maximized, but transport network capacity requirement becomes excessively high (4 Gbps for time domain raw data)
Solution Approach 1:
The patent extracts only the most valuable data components for transmission. Specifically, it selects and transmits only the soft bits corresponding to the N subbands with the best channel quality from each assistant point, rather than transmitting all user data. This extraction approach maintains UL CoMP gain by preserving the most informative data while dramatically reducing transport network capacity requirements from 4 Gbps to a manageable level.
Solution Approach 2:
The patent applies local quality by differentiating the importance of different data components. Instead of treating all subbands equally, it identifies and prioritizes the N subbands with the best channel quality at each assistant point. This selective approach ensures that the most valuable local data (best quality subbands) are transmitted to the converging point, while lower quality data are discarded, optimizing the trade-off between UL CoMP gain and transport capacity.
2Quantity of substance
If soft bit conversion is performed at assistant points before transmission, then transport network capacity requirement is reduced to 100 Mbps, but UL CoMP gain becomes medium-high instead of high
Solution Approach 1:
The patent segments the soft bits into different groups based on subband quality. After performing soft bit conversion at the assistant point, it further divides the soft bits into N subbands and selects only those from the best quality subbands for transmission. This two-stage segmentation (first by data type, then by quality) allows the system to achieve both reduced transport capacity requirements and maintained UL CoMP gain by transmitting a targeted subset of processed data.
3Quantity of substance
If decoded data is transmitted instead of raw data, then transport network capacity requirement is reduced to 12 Mbps, but UL CoMP gain becomes low due to loss of information
Solution Approach 1:
The patent performs preliminary soft bit conversion at the assistant point before selecting and transmitting data to the converging point. This preliminary processing transforms the raw data into soft bits that retain more information content, and then selects the best N subbands for transmission. This preliminary action ensures that the transmitted data contains sufficient information for effective co-processing at the converging point, maintaining UL CoMP gain while reducing transport capacity requirements to a practical level.
Data Source
AI summary
A data exchange method in a Coordinated Multi-Point (CoMP) system, including an assistant point and a converging point. One method comprises selecting a predetermined number of subbands with the best channel quality, and exchanging user data of the selected subbands. Only part of the user data received at the assistant point is transmitted to the converging point. The requirement on the transport network capacity is thus loosened. By transmitting data with the best channel quality, a good enough gain is guaranteed.