Uplink Control Information Mapping Across TTI Groups
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving uplink control information, particularly in managing different Transmission Time Intervals (TTIs) to optimize latency and power efficiency across various services and user equipment (UEs).
Innovation Solution
A method is proposed where a terminal in a wireless communication system supports multiple TTI lengths, allowing for the allocation, transmission, and reception of uplink control information across multiple cells, with specific TTI lengths configured based on downlink cells, enabling flexible transmission timing and prioritization of control information based on TTI lengths and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single TTI length is used for all downlink cells, then system complexity is reduced, but flexibility in optimizing latency and power efficiency for different services is limited
Solution Approach 1:
The patent segments downlink cells into different TTI length groups (first group with first TTI length, second group with second TTI length). This segmentation allows different services to be assigned to appropriate TTI groups, achieving flexibility in optimizing latency and power efficiency without requiring each cell to be individually configured, thus managing system complexity through structured grouping.
Solution Approach 2:
The patent enables dynamic selection of TTI length groups based on service requirements. The network can flexibly configure which downlink cells belong to which TTI length group, allowing the system to adapt to different service needs (latency-sensitive vs. power-efficient services) while maintaining manageable complexity through standardized group configurations.
2Productivity
If multiple TTI lengths are supported for different services, then latency and power efficiency are optimized, but complexity in managing uplink control information transmission increases
Solution Approach 1:
The patent applies local quality by configuring specific uplink cells with TTI lengths matched to their corresponding downlink cell groups. First uplink cells corresponding to first downlink cells are configured with first TTI lengths, while second uplink cells corresponding to second downlink cells are configured with second TTI lengths. This localized configuration optimizes service performance while managing complexity through consistent grouping relationships.
Solution Approach 2:
The patent performs preliminary configuration of TTI length groups and their corresponding uplink cells before actual data transmission. The network pre-configures which downlink cells belong to which TTI length groups and establishes the corresponding uplink cell mappings in advance, simplifying the management of uplink control information during actual operation by having predetermined relationships already established.
3Reliability
If uplink control information is transmitted in all uplink cells, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements partial action by configuring uplink control information transmission only in specific uplink cells corresponding to specific downlink cell groups, rather than in all uplink cells. This allows the system to achieve sufficient reliability for each service type by transmitting control information in appropriately configured cells, while reducing overall power consumption by avoiding redundant transmissions in unnecessarily configured cells.
Data Source
AI summary
A method for transmitting an uplink signal for a terminal configured to support at least one transmission time interval (TTI) length in a wireless communication system, according to one embodiment of the present invention, is performed by the terminal and comprises the steps of: receiving, in multiple downlink cells, a downlink data channel; and transmitting, in at least one uplink cell, uplink control information for the downlink data channel, wherein the at least one uplink cell corresponds to at least one of the multiple downlink cells, and downlink cells having the same TTI length or a TTI length of one group may correspond to one uplink cell.