HARQ Sub-Packet Transmission via Feedback-Driven Carrier Selection
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Solution Overview
Problem
In wireless communication systems, there is no guarantee that data packets are received accurately by the receiving end, and existing methods lack efficiency in adapting to changing channel conditions, particularly during handover situations and in multi-cell/sector environments, leading to potential data transmission failures.
Innovation Solution
A method using hybrid automatic request (HARQ) technique that involves receiving feedback information from the receiving end to select optimal carrier and antenna combinations for subsequent sub-packet transmission, with the option to change modulation schemes or transmit on multiple carriers/antennas simultaneously, and using an overhead channel to convey the selected combination for improved data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are transmitted using conventional methods in wireless communication systems, then transmission can be performed, but there is no guarantee of accurate reception and transmission efficiency deteriorates in changing channel conditions
Solution Approach 1:
The data packet is divided into multiple sub-packets for transmission. This segmentation allows the receiver to request specific sub-packets that were not accurately received, improving both reliability and efficiency by avoiding retransmission of entire packets or unnecessary sub-packets.
Solution Approach 2:
The system implements a feedback mechanism where the receiving end sends feedback information to the transmitting end about which sub-packets were not accurately received. This feedback enables targeted retransmission of only the necessary sub-packets, resolving the contradiction between ensuring accurate reception and maintaining transmission efficiency.
2Adaptability or versatility
If the transmitting end uses fixed transmission parameters, then device complexity is reduced, but adaptability to changing channel conditions deteriorates
Solution Approach 1:
The transmission parameters (carrier frequency, antenna selection, modulation scheme) are made dynamic rather than fixed. The system selects different parameters based on feedback information about channel conditions, enabling adaptation to changing environments while managing complexity through systematic parameter selection based on receiver feedback.
3Reliability
If sub-packets are retransmitted without selecting optimal carriers and antennas, then transmission procedure is simplified, but data transmission reliability deteriorates in multi-cell environments
Solution Approach 1:
The system performs preliminary actions by selecting optimal carriers and antennas before sub-packet retransmission based on feedback information. This advance selection ensures that retransmitted sub-packets use the best available transmission paths, improving reliability without requiring complex real-time decision-making during retransmission.
Data Source
AI summary
A method of transmitting subsequent sub-packets in a wireless communication system using a hybrid automatic request (HARQ) technique is disclosed. The method includes receiving feedback information from at least one receiving end, transmitting a transmit packet via at least one overhead channel, wherein the transmit packet includes information on carrier and antenna combination selected for subsequent transmission, and transmitting at least one sub-packet according to the selected carrier and antenna combination.