Simultaneous Uplink and D2D Transmission via Multi-Antenna Streams
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Solution Overview
Problem
Current wireless communication systems face challenges in managing interference and optimizing resource allocation for simultaneous device-to-device (D2D) and infrastructure communications, as base stations lack control over D2D interference and resource dedication can reduce overall system capacity.
Innovation Solution
A method and apparatus that enable a wireless communications device to simultaneously transmit uplink data to a base station and D2D data to another device using separate multi-antenna streams, with the base station controlling the antenna configurations and power levels for both transmissions, and acting as an intermediary for acknowledgment signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resources are dedicated to device to device communications, then device to device communication capability is improved, but infrastructure communication resources are reduced
Solution Approach 1:
The patent merges device-to-device communication and infrastructure communication into the same uplink spectrum resources. The wireless communications device simultaneously transmits both D2D data signals and uplink data signals using the same frequency resources, eliminating the need to dedicate separate resources for D2D communication while maintaining infrastructure communication capacity.
Solution Approach 2:
The uplink spectrum resources are designed to serve multiple functions simultaneously - both infrastructure communication (device to base station) and device-to-device communication. The base station coordinates and controls both types of transmissions, making the resources universal rather than dedicated to a single function.
2Productivity
If device to device communication is allowed, then system capacity is increased, but interference control becomes difficult
Solution Approach 1:
The base station acts as an intermediary that coordinates and controls device-to-device communication. It provides instructions to devices regarding power levels, resource allocation, and transmission parameters, thereby maintaining control over interference while enabling D2D communication to increase system capacity.
Solution Approach 2:
The system implements feedback mechanisms where devices report channel conditions and interference levels to the base station, which then adjusts power levels and resource allocation accordingly. This closed-loop control enables interference management while maintaining high system capacity through efficient D2D communication.
Data Source
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AI summary
A wireless communications device, e.g., a mobile wireless terminal (WT), is controlled, i.e. instructed (508), by a base station to simultaneously: (i) transmit uplink data signals in an uplink spectrum to a base station (WT to BS signals, UL WAN signals) and (ii) transmit device to device (D2D) data signals in the uplink spectrum to another wireless communications device (WT to WT signals, D2D data signals). In various embodiments, the uplink data signals are communicated in a first multi-antenna stream corresponding to a first multi-antenna configuration (518) and the device to device data signals are communicated in a second multi-antenna stream corresponding to a second multi-antenna configuration (520). Control information communicated from the base station to the wireless communications device being controlled include, e.g., a selected first antenna configuration for uplink data signaling (510), a selected second antenna configuration for device to device data signaling (512), a selected first maximum transmission power level for uplink data signaling (514) and a selected second maximum transmission power level for device to device data signaling (516).