D2D Communication Setup Using Preliminary Channel Measurements
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Solution Overview
Problem
Conventional cellular controlled D2D communication systems experience latency and resource waste due to the need for channel quality measurement and feedback, especially when devices are in close proximity and already aware of the channel conditions.
Innovation Solution
Devices can send a request to a radio network node indicating their intention for D2D communication, including proximity or channel quality indicators, allowing the network to allocate resources directly without probing and measurement feedback, thereby speeding up the setup process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel quality measurement and feedback procedure is performed for D2D setup, then reliable communication can be ensured, but latency increases and resources are wasted
Solution Approach 1:
The patent applies preliminary action by having devices perform channel quality measurements and store results in advance before D2D communication is actually needed. When D2D setup is requested, the pre-measured channel quality information is immediately available, eliminating the need for real-time measurement and feedback procedures. This resolves the contradiction by ensuring reliability through prior measurements while avoiding latency during the actual setup phase.
2Reliability
If channel quality measurement and feedback procedure is performed for D2D setup, then communication quality can be guaranteed, but network resources are consumed
Solution Approach 1:
The patent implements preliminary action by having devices perform and store channel quality measurements beforehand. These pre-acquired measurements are reused when D2D communication is initiated, eliminating the need for repeated real-time measurements and feedback transmissions. This approach guarantees communication quality through reliable channel information while significantly reducing network resource consumption during the actual setup process.
Solution Approach 2:
The patent applies self-service by enabling devices to autonomously perform channel quality measurements and maintain local records of channel conditions. Devices serve themselves by having this information readily available without requiring network-coordinated measurement procedures or feedback transmissions. This resolves the contradiction by ensuring communication quality through device-maintained channel information while minimizing network resource usage.
3Extent of automation
If conventional cellular communication protocol is used, then network control is maintained, but D2D setup efficiency is reduced
Solution Approach 1:
The patent resolves this contradiction by combining network control with preliminary action. The network maintains control by authorizing and managing D2D communications, while devices perform channel quality measurements in advance and store results locally. When D2D setup is requested, the network receives the pre-measured information from devices and makes setup decisions based on this data, eliminating the need for time-consuming real-time measurement procedures while preserving network authority.
Data Source
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AI summary
Disclosed are methods and apparatus for setting up cellular controlled device-to-device communications. A method can comprise sending, from a first device to a radio network node, a request to initiate device-to-device communication with a second device, the request comprising an identification of the second device and a first indicator indicating an intention of a device-to-device type of the communication; receiving, from the radio network node, a resource allocation; and transmitting service contents in the device-to-device communication directly between the first device and the second device using the allocated resources.