WTRU Cooperation for Wireless Data Transmission
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, achieving uniform user experience across geographic areas is challenging due to issues like poor coverage, high latency, and battery drain in low-power devices, especially in scenarios with high WTRU density, where repetition degrades throughput and shortens battery life.
Innovation Solution
Implementing WTRU cooperation methods that allow sets of wireless transmit/receive units to share data and resources efficiently, using two-phase cooperation protocols for improved data transmission and reception, leveraging the benefits of high-density WTRU deployments to enhance performance and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetition is used to improve performance in poor coverage areas, then reliability is improved, but throughput degrades and latency increases
Solution Approach 1:
The system segments the transmission task by dividing data into multiple packets that can be transmitted cooperatively by multiple WTRUs. Instead of one WTRU repeating transmissions, multiple WTRUs each transmit portions of the data, achieving reliability through diversity while maintaining higher throughput by parallel transmission.
Solution Approach 2:
Multiple WTRUs merge their transmission resources to cooperatively transmit data to the base station. By combining the transmission capabilities of multiple devices, the system achieves both reliability (through multiple transmission paths) and maintains throughput (by utilizing aggregated resources rather than single-device repetition).
2Reliability
If repetition is used to improve performance in poor coverage areas, then reliability is improved, but latency increases
Solution Approach 1:
The system performs preliminary actions by having multiple WTRUs prepare and transmit data packets in advance through coordinated scheduling. The base station receives multiple copies simultaneously from different WTRUs, eliminating the need for sequential retransmissions and reducing overall latency while maintaining reliability.
Solution Approach 2:
Multiple WTRUs continuously transmit data packets to the base station in a coordinated manner, ensuring that transmission actions are continuous rather than interrupted by repetition cycles. This continuous parallel transmission maintains reliability while minimizing latency by avoiding idle repetition intervals.
3Reliability
If repetition is used in low-power devices, then transmission reliability is improved, but battery life is drained
Solution Approach 1:
The system enables self-service by allowing multiple WTRUs to cooperatively transmit data, where each participating WTRU contributes its own transmission resources. This distributes the energy burden across multiple devices rather than requiring intensive repetition from a single low-power device, maintaining reliability while preserving battery life.
Solution Approach 2:
The cooperative transmission mechanism serves multiple functions simultaneously: it provides transmission diversity for reliability, distributes energy consumption across multiple devices, and enables low-power devices to participate without excessive battery drain. Each WTRU can transmit at lower power levels while the collective achieves the required reliability.
4Area of stationary object
If high density of WTRUs is deployed, then network coverage is improved, but resource availability for individual WTRUs decreases
Solution Approach 1:
In high-density scenarios, multiple WTRUs merge their available resources (transmission power, time slots, frequency resources) to cooperatively transmit data. This pooling of resources from multiple devices compensates for the reduced individual resource availability, allowing each WTRU to achieve reliable transmission despite limited individual resources while maintaining extensive network coverage.
Data Source
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AI summary
A method for transmitting data using a two-phase cooperation that includes a first sharing phase and a second cooperative phase is provided. In an embodiment, a method for cooperative data transmission performed by a first WTRU is disclosed. The method includes receiving, by the first WTRU from an eNB, cooperative set configuration information including a cooperative set identification. In the sharing phase, the first WTRU may receive from the eNB, a resource assignment for a first data transmission. During the sharing phase, the first data transmission may be transmitted using resources indicated in the received resource assignment. A second data transmission may be received from a second WTRU during the sharing phase. On a condition the second data transmission is successfully received by the first WTRU, a third data transmission may be transmitted, in cooperation with the second WTRU, during the cooperative phase.