Uplink Control Channel Frequency-Domain Multiplexing for Latency Reduction
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Solution Overview
Problem
Existing wireless communication systems face latency issues due to the use of multiple symbols for uplink (UL) transmission, which is not efficient in reducing transmission latency, especially with the proposed reduction to one or several symbols in future 5G communication frameworks.
Innovation Solution
A new PUCCH channel structure and UL information transmission method that staggers the multiplexing of reference signals and control information in the frequency domain, allowing for efficient transmission and reception of uplink information using reduced UL symbols, thereby reducing transmission latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple UL symbols are used for PUCCH transmission, then transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The patent transitions from time-domain multiplexing (multiple UL symbols sequentially) to frequency-domain multiplexing (multiple reference signals and control information staggered across frequency resources within a single or reduced number of symbols). This dimensional shift allows simultaneous transmission of reference signals and control information, reducing latency while maintaining reliability through frequency diversity.
Solution Approach 2:
The patent introduces dynamic resource allocation where the number of UL symbols is reduced from the traditional 7 per slot to 1-3 symbols, and reference signals are dynamically staggered across frequency resources. This dynamic adaptation enables the system to achieve low latency transmission while maintaining adequate reliability through flexible resource utilization.
2Loss of time
If UL symbols are reduced to one or several symbols, then transmission latency is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent compensates for reduced time resources by expanding into the frequency dimension. Multiple reference signals are staggered across different frequency resources within the reduced UL symbols, providing frequency diversity that maintains transmission reliability despite the reduction in time-domain resources.
Solution Approach 2:
The patent merges the transmission of reference signals and control information into the same reduced UL symbols through frequency-domain staggered multiplexing. This combination allows both functions to coexist in limited resources, maintaining reliability without requiring separate time resources.
3Productivity
If reference signals and control information are transmitted in the same UL symbols, then resource utilization is improved, but signal interference increases
Solution Approach 1:
The patent segments frequency resources into distinct regions for reference signals and control information, with staggered positioning that separates them in the frequency domain. This segmentation reduces mutual interference while maintaining high resource utilization by eliminating guard symbols and achieving tighter packing.
Solution Approach 2:
The patent applies different frequency resource allocations and staggered positioning strategies to different parts of the spectrum. Reference signals and control information are assigned to specific frequency regions with appropriate spacing, providing local quality optimization that minimizes interference while maximizing overall resource utilization.
Data Source
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AI summary
Embodiments of the present disclosure relate to a method and apparatus of transmitting uplink (UL) information and a method and apparatus of receiving UL information. In one embodiment of the present disclosure, the method of transmitting UL information comprises transmitting a reference signal using a first sequence; and transmitting UL control information using a second sequence; wherein a reference signal and the UL control information are staggered-multiplexed in frequency domain. With embodiments of the present disclosure, the uplink information can be transmitted in reduced uplink symbols so as to adapt for a proposed subframe structure with reduced uplink symbols and thus, the transmission latency can be reduced greatly.