LTE-Direct Relay Discovery for Out-of-Coverage Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face service disruptions when mobile devices move out of the coverage area of a base station, leading to loss of connectivity.
Innovation Solution
Mobile devices can transition to a relay status, broadcasting a peer discovery signal to indicate their capability to act as a relay between other mobile devices and a base station, establishing direct links to maintain communication even when out of coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile device transitions to relay status and transmits peer discovery signals continuously, then relay service availability is improved, but power consumption increases
Solution Approach 1:
The mobile device transmits peer discovery signals periodically at defined intervals rather than continuously, allowing the device to enter low-power states between transmission cycles while still maintaining relay service availability when needed
Solution Approach 2:
The mobile device autonomously determines whether to transition to relay status by evaluating local conditions such as its own power level and the presence of out-of-coverage devices, making the relay service self-regulating and power-efficient
2Reliability
If a mobile device transitions to relay status, then connectivity for out-of-coverage devices is improved, but device complexity increases
Solution Approach 1:
The mobile device acts as an intermediary relay node between out-of-coverage devices and the base station, using standardized peer discovery signals and relay protocols that simplify the complexity by providing a clear mediator role without requiring complex peer-to-peer negotiation
Solution Approach 2:
The relay-capable mobile device can function in multiple modes (normal operation, relay status, out-of-coverage status) and the peer discovery signals are universally interpretable by any device in the network, reducing the need for device-specific complex logic
3Speed
If peer discovery signals are transmitted frequently, then relay discovery speed is improved, but transmission power increases
Solution Approach 1:
Peer discovery signals are transmitted at periodic intervals rather than continuously or on-demand, achieving a balance between discovery speed and power consumption by using defined transmission cycles that allow quick discovery when needed while conserving power during idle periods
Solution Approach 2:
The mobile device determines relay status and prepares peer discovery signals in advance based on predicted needs (such as detecting out-of-coverage conditions), allowing rapid relay establishment when required without continuous high-power transmission
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
Methods, systems, and devices are described for managing wireless communications. In one method, a mobile device may determine to transition to a relay status. The relay status may indicate a capability of the mobile device to function as a relay device between at least one other mobile device and a base station. A peer discovery signal that indicates the relay status may then be transmitted. In another method, a mobile device may broadcast an out-of-coverage status indicator in a first peer discovery signal. A second peer discovery signal may be received from at least one other mobile device. The second peer discovery signal may indicate a capability of the at least one other mobile device to function as a relay device.