Uplink Control Information Transmission for Coordinated Multi-Point Reception
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Solution Overview
Problem
In wireless communication systems, there is a need to ensure optimal transmission of control information (UCI) for CoMP and inter-NodeB UL CA operations, particularly in ensuring UCI BLER targets and decoupling UCI transmission from data information transmission due to varying latency and interference conditions across different reception points.
Innovation Solution
A UE determines the number of coded modulation symbols per spatial layer for UCI based on the intended reception point and decides whether to multiplex UCI in a PUSCH or PUCCH depending on communication latency between reception points, using higher layer signaling to adjust transmission parameters and decouple UCI from data information for efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UCI is multiplexed with data information in a single PUSCH transmission, then resource utilization is improved, but transmission reliability deteriorates due to varying latency and interference conditions across different reception points
Solution Approach 1:
The patent segments UCI and data information into separate transmission channels (PUCCH for UCI, PUSCH for data) when different reception points are involved. This segmentation allows each channel to be optimized for its specific reception point, improving reliability by avoiding the interference and latency issues that would arise from multiplexing both types of information in a single channel.
Solution Approach 2:
The patent dynamically selects between multiplexing UCI and data in PUSCH versus transmitting them separately in PUCCH and PUSCH, based on the identification of reception points and current channel conditions. This dynamic adaptation allows the system to optimize for resource utilization when conditions permit, while switching to separate transmission when reliability is compromised by varying latency and interference across reception points.
2Productivity
If UCI transmission is coupled with data information transmission to the same reception point, then processing efficiency is improved, but transmission latency increases due to varying communication conditions across different reception points
Solution Approach 1:
The patent segments UCI and data information transmissions based on their destination reception points. When UCI and data are intended for different reception points, they are transmitted separately through different channels (PUCCH and PUSCH respectively), eliminating the latency caused by coupling transmissions that would otherwise experience different communication conditions and require different processing timelines.
Solution Approach 2:
The patent dynamically determines whether to couple or separate UCI and data transmissions based on the identified reception points and current communication conditions. This dynamic approach allows the system to achieve processing efficiency when coupling is beneficial, while avoiding latency penalties when different reception points would experience varying communication conditions.
3Device complexity
If a single PUSCH channel is used for both UCI and data information, then device complexity is reduced, but transmission precision deteriorates due to varying interference conditions across multiple reception points
Solution Approach 1:
The patent segments UCI and data information into separate transmission channels (PUCCH and PUSCH) when different reception points are identified, allowing each channel to be optimized for its specific reception point's interference conditions. This segmentation improves transmission precision by avoiding the degradation that would occur from attempting to simultaneously serve multiple reception points with different interference characteristics through a single channel.
Solution Approach 2:
The patent applies local quality optimization by transmitting UCI and data information through different channels that are each optimized for their respective reception points. This allows each transmission to be tailored to the specific interference conditions and requirements of its destination, improving overall transmission precision compared to a unified approach.
4Reliability
If UCI and data information are transmitted to different reception points through separate channels, then transmission reliability is improved, but resource utilization deteriorates due to increased channel overhead
Solution Approach 1:
The patent dynamically selects between separate channel transmission (PUCCH for UCI, PUSCH for data) and multiplexed transmission (both in PUSCH) based on the identification of reception points and current channel conditions. This dynamic selection allows the system to achieve improved reliability when separate transmission is necessary, while optimizing resource utilization when multiplexing is feasible, thereby balancing the trade-off between these two parameters.
Data Source
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AI summary
Methods and apparatus are described for a User Equipment (UE) to determine a number of coded modulation symbols per spatial layer for an Uplink Control Information (UCI) type it multiplexes in a Physical Uplink Shared CHannel (PUSCH). The UE communicates with different sets of Reception Points (RPs) in different Transmission Time Intervals (TTIs) wherein two RPs in a same set of RPs have a communication latency that is smaller than or equal to a predetermined value and two RPs in two different respective sets of RPs have a communication latency that is larger than a predetermined value.