LTE Multicast Feedback Resource Correlation
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Solution Overview
Problem
Conventional wireless communication systems, particularly MIMO systems, lack effective feedback mechanisms to indicate unreceived or indecipherable blocks of transmission data, leading to inefficiencies and potential interference in LTE networks.
Innovation Solution
The method involves correlating blocks of downlink transmission resources with blocks of uplink transmission resources during scheduling, allowing terminal devices to transmit feedback messages, such as negative acknowledgments, to indicate data loss, and employing probability factors to limit simultaneous responses and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback mechanisms are implemented to indicate unreceived or indecipherable blocks of transmission data, then the reliability of data transmission is improved, but the device complexity increases due to the need for scheduling correlations between downlink and uplink resources
Solution Approach 1:
The system pre-schedules correlations between downlink transmission resource blocks and uplink feedback resource blocks before actual data transmission occurs. This preliminary scheduling allows terminal devices to immediately know which uplink resource to use for feedback without complex real-time calculations, thus improving reliability while managing complexity through advance preparation
Solution Approach 2:
The patent implements a feedback mechanism where terminal devices transmit feedback messages (such as negative acknowledgments) on correlated uplink resource blocks to indicate unreceived or indecipherable downlink data blocks. This feedback loop enables the network to identify and retransmit lost data, significantly improving transmission reliability
2Reliability
If multiple terminal devices transmit feedback messages simultaneously to indicate data loss, then the reliability improvement is accelerated, but interference increases causing harmful factors
Solution Approach 1:
The system segments the feedback transmission by assigning different terminal devices to different uplink resource blocks based on pre-established correlations with downlink resource blocks. This segmentation distributes simultaneous feedback transmissions across multiple time-frequency resources, reducing interference while maintaining the reliability benefits of multiple devices reporting data loss
Solution Approach 2:
The scheduling of uplink feedback resources is dynamically adjusted based on downlink transmission patterns. The system correlates specific downlink resource blocks with specific uplink feedback resource blocks, allowing flexible allocation that optimizes both reliability and interference management according to actual transmission conditions
3Reliability
If uplink resources are allocated for feedback transmission, then the reliability of error detection is improved, but the loss of transmission resources increases
Solution Approach 1:
The correlated uplink resource blocks serve multiple functions: they are used for normal uplink communication and simultaneously serve as feedback channels for indicating downlink data reception status. This multi-functionality allows the system to achieve reliable error detection without dedicating separate exclusive feedback resources, thus minimizing resource loss
Data Source
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AI summary
Facilitating feedback to a third generation partnership project (3GPP) long term evolution (LTE) or subsequent network is described herein. By way of example one or more blocks of downlink transmission resources (e.g., downlink channel) can be correlated to one or more blocks of uplink transmission resources (e.g., uplink channel) during scheduling of a transmission allocation period. For instance, the correlation can identify to terminal devices a particular uplink channel that can be used to transmit, among other things, a negative acknowledgement (NACK) related to a particular downlink channel. Additionally, multiple uplink resources can be employed to facilitate a quantitative and/or qualitative determination of severity of data loss. Furthermore, a limiting factor can reduce a number of terminal devices responding to lost data simultaneously, reducing feedback interference. As described, the subject innovation can provide for dynamic and/or static feedback in LTE networks to ensure robust service transmissions for such networks.