Adaptive Probing Pilot Transmission in Shared Radio Cells
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Solution Overview
Problem
The introduction of additional pilots in shared radio cell deployments can negatively impact legacy UEs by reducing radio link throughput due to increased power allocation for pilot transmission, which affects both legacy and newer UEs.
Innovation Solution
A method where a radio network node in a shared radio cell deployment determines the presence of UEs capable of using probing pilots and only transmits them when such UEs are present, optimizing power levels and enabling adaptive utilization based on thresholds of UE density and traffic load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additional probing pilots are transmitted in shared radio cell deployment, then spatial reuse and capacity are improved, but transmission power consumption increases and radio link throughput for legacy UEs deteriorates
Solution Approach 1:
The patent implements dynamic control of probing pilot transmission by the radio network node. The node determines whether to transmit probing pilots based on real-time detection of legacy UE presence in the cell. When legacy UEs are detected, the transmission of probing pilots is dynamically adjusted or suppressed to reduce power consumption and avoid degrading the radio link throughput of legacy UEs. This dynamic adaptation resolves the contradiction between improving spatial reuse capacity and reducing transmission power consumption.
2Measurement precision
If probing pilots are transmitted continuously, then channel estimation accuracy for modern UEs is improved, but interference to legacy UEs increases and their performance deteriorates
Solution Approach 1:
The patent employs a feedback mechanism where the radio network node continuously monitors or detects the presence of legacy UEs in the shared radio cell. Based on this feedback information, the node adaptively controls the transmission of probing pilots. When legacy UEs are present, the transmission is adjusted to minimize interference. This feedback-driven approach resolves the contradiction by enabling accurate channel estimation for modern UEs only when it does not harm legacy UE performance.
3Reliability
If power allocation for pilot transmission is increased, then pilot signal quality is improved, but data transmission power available for UEs is reduced and throughput deteriorates
Solution Approach 1:
The patent implements parameter changes in the power allocation strategy by conditionally adjusting pilot transmission power based on the presence of legacy UEs. When legacy UEs are detected, the power allocation parameter for probing pilots is changed (reduced or suspended) to ensure that sufficient power remains available for data transmission to maintain acceptable throughput. This parameter adaptation resolves the contradiction between ensuring adequate pilot signal quality and maintaining data transmission throughput.
Data Source
AI summary
The present disclosure concerns radio communication. More particularly, the present disclosure inter alia introduces adaptive utilization of additional pilots, such as probing pilots, in a shared radio cell deployment. According to one embodiment, information on UE capabilities of UEs that are present in the shared radio cell is collecting (110). Based on the thus collected information it is also determined (120) whether there exists any UE that is capable of utilizing probing pilots (e.g. a Rel-12 UE or similar). In response to a determination that there exists at least one UE that is capable of utilizing probing pilots probing pilots are transmitted (130) to the UEs.