Half-Duplex Wireless Packet Re-Encoding for Collision Reduction
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Solution Overview
Problem
In half-duplex based wireless communication systems, particularly in V2X communication, the use of larger packet sizes and longer transmission times leads to increased data losses due to the inability of user equipment (UEs) to receive data during transmission, resulting in collisions and inefficiencies.
Innovation Solution
User equipment (UEs) re-encode longer packets with a higher modulation order and coding rate to form shorter packets, which are then transmitted in multiple repetitions to improve reception and reduce data losses, with the number of repetitions adjusted based on the required communication range and signal-to-noise ratio (SNR) to accommodate varying packet sizes and ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If larger packet sizes are used to support V2X communication requirements, then the transmission range is improved, but the transmission time increases leading to higher half-duplex losses
Solution Approach 1:
The patent divides a large data packet into multiple smaller transport blocks that can be transmitted separately. This segmentation allows the system to maintain the required transmission range through sufficient total data transmission while reducing the time each individual transmission occupies the half-duplex channel, thereby reducing half-duplex losses.
Solution Approach 2:
The patent employs periodic retransmissions of transport blocks at scheduled intervals. This periodic action ensures that even if some transmissions are lost due to half-duplex conflicts, the data can be retransmitted at subsequent opportunities, maintaining reliable communication without requiring excessively long initial transmission times.
2Quantity of substance
If longer transmission time is used to meet required transmission range, then more data can be transmitted, but packet losses increase due to half-duplex collisions
Solution Approach 1:
The patent performs preliminary segmentation of data into multiple transport blocks before transmission. This preliminary action enables the system to transmit data in manageable units with built-in redundancy, allowing receivers to reconstruct the original data even if some transport blocks are lost due to half-duplex collisions during the extended transmission period.
Solution Approach 2:
The patent incorporates redundant transmissions and retransmission mechanisms as a cushion against potential packet losses. By preparing multiple copies and retransmission schedules in advance, the system compensates for the increased vulnerability to collisions that arises from longer transmission times in half-duplex mode.
3Device complexity
If UEs transmit data in half-duplex mode, then device complexity is reduced, but data reception during transmission becomes impossible leading to collisions
Solution Approach 1:
The patent segments data into multiple transport blocks that can be transmitted in sequence. This segmentation allows receiving UEs to potentially receive subsequent transport blocks even after missing earlier ones, maintaining reliability without requiring full-duplex capability or complex scheduling to avoid all collisions.
Data Source
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AI summary
Methods, apparatuses, and computer-readable mediums for wireless communication include re-coding a first coded packet into a second coded packet, wherein the second coded packet includes less coded bits and has a higher modulation order than the first packet, generating one or more redundant versions of the second packet, and transmitting the second packet and the one or more redundant versions of the second packet at different times to a receiving user equipment.