Shared Uplink Control Signaling for NR-LTE Dual Connectivity
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Solution Overview
Problem
In wireless communication systems, there is a challenge in transmitting uplink control information effectively when both new and legacy base stations, such as NR and LTE, coexist, especially considering their different operating schemes and potential non-ideal backhaul connections.
Innovation Solution
A method and device for transmitting uplink control information by a user equipment (UE) in a wireless communication system, where the UE receives downlink signals from both NR and LTE base stations and transmits corresponding uplink control information using a shared carrier, employing techniques like time division multiplexing, frequency division multiplexing, and specific coding schemes to manage the transmission efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is transmitted separately to NR and LTE base stations, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines uplink control information for both NR and LTE base stations into a single transmission using a shared carrier. The terminal device generates one unified uplink control information message that includes feedback for downlink signals from both base stations, eliminating the need for separate transmission channels and reducing device complexity while maintaining reliability
Solution Approach 2:
The shared carrier is designed to serve multiple functions by carrying uplink control information for both NR and LTE base stations simultaneously. This universal transmission mechanism allows a single carrier to handle control information for different base station types and communication systems, reducing the number of required carriers and simplifying device operations
2Device complexity
If a shared carrier is used for transmitting uplink control information to both base stations, then device complexity is reduced, but reliability deteriorates due to potential resource conflicts
Solution Approach 1:
The patent segments the shared carrier transmission into distinct time-frequency resources for different base stations. By allocating specific resource blocks and time slots to NR and LTE base stations respectively, the system eliminates resource conflicts while maintaining the benefits of a shared carrier, thus preserving reliability without increasing device complexity
Solution Approach 2:
The patent implements dynamic resource allocation on the shared carrier, where resource assignments for NR and LTE base stations can be adjusted based on current channel conditions and traffic requirements. This dynamic approach allows the system to optimize resource usage in real-time, preventing conflicts and maintaining high reliability while keeping device complexity low
3Reliability
If time division multiplexing is employed to separate uplink control information transmissions, then resource conflicts are avoided, but transmission time increases
Solution Approach 1:
The patent transitions from purely time-division multiplexing to a multi-dimensional resource allocation approach that combines frequency and spatial dimensions. By utilizing different frequency resources and spatial multiplexing techniques alongside time division, the system can transmit uplink control information for multiple base stations simultaneously or with minimal time separation, reducing transmission time while avoiding resource conflicts and maintaining reliability
Data Source
AI summary
Disclosed are a method for transmitting uplink control information by a terminal in a wireless communication system and a device for supporting the same. More particularly, disclosed are a method for transmitting, by a terminal, uplink control information corresponding to downlink signals received from two base stations communicating with the terminal by different schemes when the two base stations are connected with the terminal by a dual connectivity method, and a device for supporting the same.