Multi-Device Synchronization With Cooperative UE Transmit Diversity
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Solution Overview
Problem
User equipment (UE) faces limitations in transmission power due to battery capacity and regulatory restrictions, and large path loss, which are exacerbated by distance from communication hubs, and insufficient data throughput requiring additional antennas that may be costly or impossible to implement.
Innovation Solution
UEs cooperate to transmit data using multiple antennas, employing space-time orthogonal block coding and transmit diversity to increase transmission power and throughput without increasing network resource complexity, aligning phases through reference signal structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If user equipment increases transmission power to overcome path loss and distance limitations, then signal quality and data throughput are improved, but battery capacity is depleted faster and regulatory power restrictions are violated
Solution Approach 1:
Multiple user equipment devices are combined to form a distributed antenna system where each device transmits the same data signal simultaneously. The signals are combined at the base station through constructive interference, achieving higher effective transmission power without requiring individual devices to increase their power output beyond regulatory limits or battery capacity.
Solution Approach 2:
The transmission function is segmented across multiple user equipment devices rather than relying on a single high-power transmitter. Each device transmits at moderate power levels within regulatory constraints, while the collective effect achieves the desired high-power transmission performance through coordinated multi-point transmission.
2Productivity
If spatial multiplexing techniques are used to send multiple concurrent signals to increase data throughput, then data rate is improved, but the number of antennas required increases which is expensive or impossible to implement
Solution Approach 1:
User equipment devices serve multiple functions: they act as both end-user devices and distributed antenna elements. The same user equipment that consumes wireless services also contributes its antenna to the cooperative transmission system, enabling multiple concurrent signal transmissions without requiring dedicated additional antenna hardware.
Solution Approach 2:
The transmission capability is copied across multiple user equipment devices. Each device transmits a copy of the data signal, and through constructive combining at the base station, the system achieves the effect of having multiple transmit antennas without requiring physical antenna arrays at each user device.
3Productivity
If more time and frequency resources are allocated to wireless communication to increase data throughput, then data rate is improved, but valuable network resources are consumed
Solution Approach 1:
The system changes the spatial parameter by utilizing multiple geographic locations (multiple user equipment devices) rather than increasing time or frequency resources. This allows the same time-frequency resources to serve multiple spatial streams simultaneously, increasing throughput without consuming additional network resources.
Data Source
AI summary
First user equipment (UE) exchanges at least a portion of data to be transmitted to a communication network with a second UE on a side channel. The UEs then send the data to the network at increased transmission power by using transmit antennas of both the first and second UEs, instead of just those of the first UE. In some cases, the second UE may transmit a variation of the data sent by the first UE to perform transmit diversity and improve signal-to-noise ratio. To avoid unintended beamforming of the transmissions, the network may mix signals (e.g., having a same symbol) received at the same time period but at different sub-carriers, or mix the signals received at different time periods but at the same sub-carrier. The network may notify the UEs of a phase correction value based on the signals, and the UEs may adjust using the phase correction value.