Pedestrian UE Identity Merging for Power Conservation
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Solution Overview
Problem
Current vehicle-based wireless communication systems face challenges in power conservation and efficient paging mechanisms, particularly for pedestrian user equipment (PUEs) which have limited battery life and require frequent transmissions to avoid collisions with vehicles.
Innovation Solution
The proposed techniques involve a PUE adopting the identity of another PUE within a threshold distance for a discontinuous transmission (DTX) cycle, allowing it to refrain from transmitting and conserve power, and a vehicle user equipment (VUE) sending a group paging indicator using location information to address PUEs within a geographic area, enabling efficient alert messaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PUE frequently transmits location information to avoid collisions with vehicles, then collision avoidance reliability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The patent merges the transmissions of multiple PUEs located within a threshold distance by having them adopt a common identity (the identity of a reference PUE). This combining approach allows the group to send a single transmission instead of multiple separate transmissions, thereby maintaining collision avoidance reliability while significantly reducing power consumption for all PUEs in the group.
Solution Approach 2:
The patent enables a single PUE's transmission to serve multiple functions: it represents not only itself but also other PUEs within the threshold distance. By adopting a common identity, one transmission performs the work of multiple transmissions, achieving both reliability (all PUEs are represented) and energy efficiency (fewer transmissions needed).
2Use of energy by moving object
If a PUE adopts the identity of another PUE to reduce transmissions, then power consumption is reduced, but the complexity of identity management and monitoring increases
Solution Approach 1:
The patent applies preliminary action by having PUEs pre-identify and adopt the identity of a reference PUE before the DTX cycle begins. This advance preparation simplifies the monitoring process, as the PUE already knows which identity to monitor for the entire DTX duration, reducing the complexity of real-time identity management.
Solution Approach 2:
The patent introduces periodic action through the DTX (discontinuous transmission) cycle, where PUEs alternately transmit and monitor based on predefined time intervals. This periodic structure regularizes the complexity of identity adoption and monitoring, making the system more predictable and manageable despite the added identity management requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE), e.g., such as a pedestrian UE (PUE), may detect, during a first transmission period of a discontinuous transmission cycle, a transmission over a sidelink channel from a second UE that is located within a threshold distance from the first UE, the first UE associated with a first identifier. The first UE may determine, based at least in part on the transmission, a second identifier associated with the second UE, the second identifier being different from the first identifier. The first UE may use, based at least in part on the second UE being within the threshold distance, the first identifier and the second identifier during one or more subsequent transmission periods of the discontinuous transmission cycle.