Implicit Uplink Feedback via Resource Block Mapping
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Solution Overview
Problem
In wireless communication systems, particularly in LTE's TDD mode, the existing feedback report mechanisms face challenges in transmitting multiple feedback reports in a single sub-frame without losing single carrier properties, leading to limited downlink capacity and increased error probabilities due to the constraints of available resource blocks and modulation schemes.
Innovation Solution
The method involves a data receiving party selecting and transmitting feedback reports on available resource blocks using QPSK modulation, where explicit feedback information conveys implicit feedback by selecting specific feedback resources, allowing multiple feedback reports to be conveyed in a single sub-frame while maintaining single carrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple feedback reports are transmitted in a single sub-frame using existing mechanisms, then the downlink capacity is improved, but the single carrier properties are lost and error probabilities increase
Solution Approach 1:
The patent combines multiple feedback reports into a single uplink sub-frame by mapping them to different resource blocks within that sub-frame. This merging approach allows multiple ACK/NACK reports to be transmitted simultaneously without requiring multiple separate transmissions, thereby improving downlink capacity while maintaining single carrier properties through the SC-FDMA waveform.
Solution Approach 2:
The patent introduces a new dimension for feedback transmission by utilizing the resource block dimension within the uplink sub-frame. Instead of transmitting feedback sequentially in time or using multiple carriers, the invention maps different feedback reports to different frequency resources (resource blocks) within the same time slot, enabling parallel feedback transmission while preserving single carrier waveform characteristics.
2Productivity
If multiple feedback reports are transmitted in a single sub-frame, then the transmission efficiency is improved, but the device complexity increases due to resource allocation and modulation constraints
Solution Approach 1:
The patent segments the uplink resource block into multiple orthogonal resources that can accommodate different feedback reports. By dividing the available resource block into distinct transmission opportunities with different cyclic shifts and orthogonal cover codes, the system enables multiple feedback reports to be transmitted efficiently without requiring complex resource management at the terminal side.
Solution Approach 2:
The patent creates a universal feedback transmission mechanism that can handle multiple feedback reports using the same SC-FDMA resource block structure. The same physical uplink control channel (PUCCH) format and modulation scheme are used for all feedback reports, with differentiation achieved through cyclic shifts and orthogonal covers, thereby reducing device complexity compared to implementing separate transmission mechanisms for each feedback report.
3Adaptability or versatility
If asymmetric TDD transmission schemes are used, then the flexibility in accommodating traffic intensity is improved, but the number of available uplink sub-frames for feedback transmission is reduced
Solution Approach 1:
The patent merges multiple feedback reports that would traditionally require multiple uplink sub-frames into a single uplink sub-frame. By combining multiple ACK/NACK reports in one transmission opportunity using different resource blocks, the invention compensates for the reduced number of uplink sub-frames in asymmetric TDD configurations, maintaining the ability to provide feedback for multiple downlink transmissions even when uplink resources are limited.
Solution Approach 2:
The patent transitions from time-domain multiplexing of feedback reports to frequency-domain multiplexing within the same uplink sub-frame. By utilizing the frequency dimension (different resource blocks) within a single time slot, the system can accommodate multiple feedback reports despite having fewer uplink sub-frames available in asymmetric TDD modes, thereby preserving adaptability while overcoming the limitation of reduced uplink sub-frame quantity.
Data Source
AI summary
Method and apparatus for conveying feedback reports from a data receiving party (300) for data received from a data sending party (302) in a wireless connection. A plurality of feedback resources (304) assigned to different feedback information codes are allocated to the data receiving party for transmitting feedback reports. After checking whether the data was received correctly or not, the data receiving party selects a feedback resource (FR2) with a feedback information code that corresponds to one or more feedback reports on the received data. The data receiving party then sends feedback information on the selected feedback resource to the data sending party, thereby conveying the corresponding feedback information code. In this way, multiple feedback reports can be conveyed in a single feedback resource to the data sending party while still retaining single carrier properties.