RLC Polling Command Segmentation for Wireless Overhead Reduction
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Solution Overview
Problem
In wireless communication systems, particularly with evolving standards like HSPA+ and 3GPP LTE, the inefficiency of retransmitting large Protocol Data Units (PDUs) for polling purposes leads to significant overhead, as existing methods require transmitting a full PDU with a polling bit set to request receiver status, which is wasteful and inefficient.
Innovation Solution
The solution involves segmenting or re-segmenting an already transmitted PDU to transmit a reduced amount of data, using a polling command that is smaller than the RLC PDUs, thereby avoiding the need to retransmit user data and reducing data transmission overhead by using a re-segmented RLC AMD PDU with a poll indication, allowing for efficient communication of polling information without redundant data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full PDU is retransmitted with a polling bit set to request receiver status, then the polling command can be transmitted, but data transmission overhead increases significantly
Solution Approach 1:
The patent segments the polling command from the full PDU structure, creating a dedicated poll command format that contains only necessary polling information (poll bit, sequence number, length indicator) without redundant user data, thereby reducing overhead while maintaining polling functionality
Solution Approach 2:
The patent extracts the essential polling function from the complete PDU structure, isolating the poll bit and minimum necessary control information into a separate, minimal poll command format that can be transmitted independently without carrying full user data payload
2Adaptability or versatility
If polling is performed in systems with larger PDUs (HSPA+ and 3GPP LTE), then the system supports modern communication standards, but the overhead of retransmitting large PDUs for polling becomes wasteful
Solution Approach 1:
The patent changes the parameter of poll command size from being equal to full PDU size to being a minimal fixed size, adapting the polling mechanism to work efficiently with larger PDU sizes in HSPA+ and 3GPP LTE systems by decoupling poll command size from user data size
Data Source
AI summary
A data packet communication system employs radio link control (RLC) transmission between a transmitter and a receiver with an Automatic Repeat Request (ARQ) arrangement whereby polling of the receiver is accomplished with reduced amount of redundantly transmitted data, such as between an access node and terminal. Upon a polling event, such as emptying of a transmission buffer of the transmitter, expiration of a polling timer, or reaching a radio link control (RLC) protocol data units (PDUs) count threshold, the transmitter sends a polling command to the receiver. This polling command is smaller than any of the RLC PDUs by resegmenting to a variably sized PDU sending a reduced amount of data. With evolving communication standards tending toward larger PDUs, such as in excess of a kilobyte for HSPA+ (High-Speed Packet Access Evolution) and 3GPP LTE (Long Term Evolution), this inefficiency can be of increasing impact.