Flexible Segmentation Scheme for Wireless Communication Systems
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in segmentation schemes, particularly in E-UTRAN, where fixed PDU sizes lead to high overhead and inefficient retransmissions, especially in varying radio conditions, and fail to adapt to multi-user and frequency diversity gains.
Innovation Solution
A method is introduced to dynamically determine the transport block size based on data block size, segmenting data blocks into flexible segments with identifiers and offset values, and retransmitting segments as needed, allowing for adaptive modulation and channel coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed size PDU is used for segmentation, then segmentation and multiplexing overhead is reduced, but transmission efficiency deteriorates when radio conditions vary and small payloads are available
Solution Approach 1:
The patent implements dynamic PDU size adaptation by introducing a mechanism where the PDU size is no longer fixed but varies according to radio conditions and payload characteristics. The system dynamically selects appropriate PDU sizes from a set of predefined sizes based on current transmission conditions, allowing optimal adaptation without complex re-segmentation procedures.
Solution Approach 2:
The patent changes the parameter of PDU size from a fixed constant to a variable parameter that can be adjusted based on transmission conditions. By defining multiple PDU size options and selecting among them dynamically, the system achieves both reduced overhead for small payloads and efficient transmission for large payloads without requiring heavy peer-to-peer procedures.
2Speed
If small PDU size is used to fit small rate channels, then small payloads are transmitted efficiently, but large SDUs require extensive segmentation causing high overhead
Solution Approach 1:
The system dynamically adjusts PDU size based on the size of the SDU being transmitted and current radio conditions. For small SDUs, small PDU sizes are selected to match the payload, avoiding unnecessary segmentation. For large SDUs, larger PDU sizes are selected to reduce the number of segments required, thereby reducing segmentation overhead while maintaining efficient transmission.
Solution Approach 2:
The patent introduces multiple PDU size parameters that can be selected based on transmission requirements. This allows the system to change the PDU size parameter adaptively - using small PDUs for small payloads to maintain high transmission speed, and large PDUs for large payloads to minimize segmentation operations and associated overhead.
3Productivity
If many small PDUs are created for high rate channels, then large SDUs are transmitted efficiently, but multiplexing overhead increases
Solution Approach 1:
The system dynamically selects PDU size based on the transmission channel characteristics and SDU size. For high rate channels transmitting large SDUs, the system selects larger PDU sizes to reduce the number of PDUs required, thereby reducing multiplexing overhead while maintaining efficient utilization of the high rate channel capacity.
4Device complexity
If full SDU transmission is used as in WLAN, then segmentation and multiplexing overhead is minimized, but multi-user multiplexing gains are lost
Solution Approach 1:
The patent implements segmentation of SDUs into PDUs, enabling the MAC layer to multiplex data from multiple UEs and multiple logical channels into transport blocks. This segmentation allows efficient resource allocation and multi-user multiplexing while maintaining manageable complexity through standardized segmentation procedures.
Data Source
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AI summary
Methods, computer program products, electronic devices and information blocks are provided that improve both efficiency of transmission and efficiency of segmentation by enabling an intelligent transport block size determination and a flexible segmentation scheme suitable for utilization with retransmission. One exemplary method involves steps of: determining a size of a transport block based on criteria including a size of at least one data block to be transmitted, wherein the transport block size is determined such that the transport block will include at least one segment of a data block of the at least one data block; segmenting the data block of the at least one data block into a plurality of segments including the at least one segment; and populating the transport block with at least the at least one segment.