Uplink Feedback Method for Asymmetric Bandwidth
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Solution Overview
Problem
Existing communication systems face challenges in performing uplink feedback when the downlink bandwidth is greater than the uplink bandwidth or when the uplink transmission time interval is longer than the downlink transmission time interval, leading to difficulties in efficient data transmission.
Innovation Solution
The proposed solution involves a method where user equipment detects downlink data in multiple consecutive sub-frames, performs joint encoding of feedback information, and transmits joint uplink feedback information in an uplink sub-frame, using specific codebooks and configurations to synchronize feedback across different carriers, enabling effective uplink feedback even when bandwidth or time intervals differ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink bandwidth is greater than uplink bandwidth, then downlink data transmission capacity is improved, but uplink feedback transmission becomes difficult
Solution Approach 1:
The feedback information for multiple downlink sub-frames is segmented and jointly encoded into a single uplink feedback message. This allows the uplink feedback to aggregate acknowledgments for multiple downlink transmissions, resolving the mismatch between larger downlink bandwidth and limited uplink feedback capacity
Solution Approach 2:
Multiple feedback messages corresponding to different downlink sub-frames are merged into a single joint uplink feedback transmission. This combining approach enables efficient utilization of the uplink channel despite the bandwidth asymmetry between downlink and uplink
2Length of moving object
If uplink transmission time interval is longer than downlink transmission time interval, then uplink transmission coverage is improved, but feedback timing synchronization becomes difficult
Solution Approach 1:
The feedback information for multiple consecutive downlink sub-frames is prepared and jointly encoded in advance, so that a single uplink feedback transmission can cover the timing gap. This preliminary preparation of aggregated feedback resolves the timing synchronization issue caused by the uplink-downlink time interval mismatch
3Productivity
If narrow-band system is used, then spectral efficiency is improved, but uplink feedback in asymmetric bandwidth scenario becomes difficult
Solution Approach 1:
The joint feedback mechanism is designed to be universal and adaptable to different bandwidth configurations. By jointly encoding feedback for multiple sub-frames, the system maintains efficient spectral utilization in narrow-band mode while simultaneously achieving adaptability to asymmetric bandwidth scenarios where downlink bandwidth exceeds uplink bandwidth
Data Source
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AI summary
The present invention provides an uplink feedback method, user equipment, and a base station, where the method includes: detecting, by user equipment, downlink data in at least two consecutive downlink sub-frames; performing joint encoding, by the user equipment, for a feedback for the downlink data in the at least two consecutive downlink sub-frames; and transmitting, by the user equipment in an uplink sub-frame corresponding to the last sub-frame of the at least two consecutive downlink sub-frames, joint uplink feedback information for the at least two consecutive downlink sub-frames, so as to resolve issue how uplink feedback is performed when downlink bandwidth is different from uplink bandwidth.