RLC Control Information Segmentation for Mobile Data Rate
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Solution Overview
Problem
In mobile communication systems, data transmission errors occur due to reordering of data blocks during HARQ procedures, leading to delayed reception status information transmission, which hampers the increase in data transmitting rate.
Innovation Solution
An apparatus is introduced that separates control information into transmitting-side-related and receiving-side-related information, transmitted through distinct channels, allowing for quicker control information transmission and retransmission of RLC PDUs by utilizing multiple logical channels and incorporating time information for processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If control information is transmitted through a single shared channel with data, then channel resource utilization is improved, but control information transmission delay increases
Solution Approach 1:
The patent segments control information into two distinct types: transmitting-side-related control information and receiving-side-related control information. Each type is transmitted through a separate logical channel (first logical channel and second logical channel respectively). This segmentation allows control information to be transmitted independently from data, eliminating the delay caused by sharing a single channel and enabling faster control signal delivery.
2Reliability
If data blocks are reordered at the receiving side to match transmission order, then data transmission reliability is improved, but control information transmission delay increases
Solution Approach 1:
The patent separates control information transmission from data transmission by creating distinct logical channels. Receiving-side-related control information is transmitted through the second logical channel independently of data reordering operations. This allows the receiving side to perform reordering on data blocks without delaying the transmission of control information, thus maintaining reliability while reducing delay.
3Productivity
If receiving-side RLC entity transmits status information quickly, then data transmitting rate is improved, but control information may arrive out of order causing errors
Solution Approach 1:
The patent segments control information into transmitting-side-related control information (sent through the first logical channel) and receiving-side-related control information (sent through the second logical channel). This segmentation ensures that receiving-side status information can be transmitted quickly through the dedicated second channel without being delayed by data reordering, while the separate first channel ensures transmitting-side control information arrives in the correct sequence, preventing HFN synchronization errors.
4Speed
If multiple logical channels are used for control information transmission, then control information transmission speed is improved, but device complexity increases
Solution Approach 1:
The patent segments control information transmission into two logical channels based on the type of control information. The first logical channel handles transmitting-side-related control information while the second logical channel handles receiving-side-related control information. This segmentation provides a clear, systematic approach to channel management that reduces complexity compared to handling all control information through a single shared channel, as each channel has a defined purpose and transmission characteristics.
Data Source
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AI summary
An apparatus for transmitting and receiving control information between Acknowledge Mode Radio Link Control (AM RLC) entities in a mobile communication system is provided. Especially, when a receiving-side AM RLC entity is connected to one or more logical channels, the receiving-side AM RLC entity sends control information through a specific one of the logical channels according to the contents of the control information to allow the transmitting side to quickly perform retransmission, thereby increasing the data transmitting rate.