Uplink Control Channel Transmission Diversity via Spatial Precoding
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Solution Overview
Problem
Wireless communication systems face challenges in ensuring successful decoding of uplink control information due to path loss and other issues in the physical uplink control channel (PUCCH), particularly in multiple-access systems like LTE and 5G networks, where transmission diversity techniques are limited.
Innovation Solution
Implementing multiple input multiple output (MIMO) techniques with spatial precoding across resource elements in the PUCCH, applying different precoders to groups of resource elements within a resource block to enhance transmission diversity, and using multi-carrier orthogonal frequency division multiplexing (OFDM) waveforms for both frequency and time domain diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission diversity techniques are applied to PUCCH, then transmission quality and signal strength are enhanced, but device complexity increases due to implementation of MIMO techniques with spatial precoding
Solution Approach 1:
The patent segments the uplink control information transmission by dividing resource blocks into multiple groups and applying different spatial precoders to each group. This segmentation allows transmission diversity to be achieved through simpler per-group processing rather than complex full-bandwidth MIMO, resolving the contradiction between reliability enhancement and device complexity.
Solution Approach 2:
The patent applies local quality by using different spatial precoders for different groups of resource blocks within the PUCCH transmission. Each group receives tailored precoding treatment, providing localized optimization that achieves overall transmission diversity without requiring complex system-wide MIMO processing, thus balancing reliability improvement with manageable device complexity.
2Reliability
If multiple spatial precoders are applied to resource elements, then transmission diversity is enhanced, but processing requirements and computational load increase
Solution Approach 1:
The patent divides resource elements into multiple groups and applies spatial precoders to each group separately. This segmentation reduces the computational burden by breaking down the complex task of processing all resource elements uniformly into simpler group-level operations, thereby achieving transmission diversity with reduced processing requirements.
Solution Approach 2:
The patent applies spatial precoding to groups of resource elements rather than to every individual resource element. This partial action approach achieves the essential transmission diversity benefit without the excessive computational load of full granular processing, resolving the contradiction between diversity enhancement and processing requirements.
3Reliability
If MIMO techniques are implemented in PUCCH, then signal strength and transmission quality improve, but the system requires more advanced capabilities and higher device complexity
Solution Approach 1:
The patent changes the parameter of spatial precoding application from system-wide uniform processing to group-level differentiated processing. This parameter change allows MIMO techniques to be implemented with adjusted complexity levels, enabling signal strength improvement while adapting to devices with varying capability levels, thus resolving the contradiction between reliability improvement and adaptability requirements.
Data Source
AI summary
Methods, systems, devices, and apparatuses for wireless communications that support transmission diversity enhancement for uplink control channel are described. Generally, the described techniques provide for enhanced performance of an uplink control channel such as a physical uplink control channel (PUCCH) through the use of transmission diversity. In some cases, multiple input multiple output (MIMO) techniques may be supported for transmission of an uplink control channel for a given format suitable for transmission diversity enhancement. A resource block (RB) used in an uplink control channel transmission may contain a number of resource elements (REs) across one or more resource blocks. According to some aspects, a transmit diversity scheme may be employed at the RE level through application of different spatial precoders for different groups of REs of a given RB.