Autonomous Uplink Transmission in Unlicensed Spectrum
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Solution Overview
Problem
LTE uplink performance is hampered in unlicensed spectrum due to centralized coordination and dependency on base-station channel access, leading to inefficiencies and increased latency compared to Wi-Fi systems.
Innovation Solution
A method for wireless devices to perform autonomous uplink transmission with pre-allocated resources and periodicity, avoiding specific subframes to reduce collisions and enhance channel utilization, particularly in unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE uses centralized coordination and base-station dependency for channel access in unlicensed spectrum, then network control and coordination are maintained, but uplink transmission latency increases and channel access efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring autonomous uplink transmission parameters (resources, periodicity, power control) at the base station before the wireless device needs to transmit. This allows the device to immediately access the channel without waiting for base-station coordination, reducing latency while maintaining network control through pre-established rules
Solution Approach 2:
The patent implements self-service by enabling wireless devices to autonomously perform uplink transmissions using pre-configured parameters without real-time base-station intervention. The device independently selects resources, controls power, and manages transmission timing, eliminating coordination delays while the base station retains overall system control through initial configuration
2Productivity
If LTE implements autonomous uplink transmission with pre-allocated resources, then channel access efficiency and spectral utilization improve, but collision risk with other networks increases
Solution Approach 1:
The patent applies periodic action by configuring autonomous uplink transmissions to occur at specific periodic intervals rather than continuously or randomly. This structured periodicity allows multiple devices to share the channel in an organized manner, improving efficiency while reducing collision risk through predictable transmission patterns that can be coordinated with other networks
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting transmission parameters (power levels, resource allocation, periodicity) based on channel conditions and network load. This allows the system to optimize channel access efficiency under varying conditions while adapting to reduce collision risk when other networks are detected
3Reliability
If LTE operates in unlicensed spectrum with LBT requirements, then regulatory compliance is achieved, but uplink transmission performance deteriorates due to channel sensing overhead
Solution Approach 1:
The patent applies preliminary action by performing channel sensing and LBT procedures in advance during base-station configuration phases. The base station assesses channel availability and configures appropriate transmission parameters before autonomous uplink transmissions begin, ensuring regulatory compliance is established upfront rather than continuously verified, thus improving transmission performance
Data Source
AI summary
A method in a wireless device (110) comprises obtaining (1004) information related to a signal transmission configuration for autonomous uplink transmission by the wireless device, the information comprising: a set of pre-allocated resources for use by the wireless device in performing autonomous uplink transmission on at least one secondary cell established between the wireless device and a network node (115); and a periodicity associated with the set of pre-allocated resources. The method comprises performing (1008) autonomous uplink transmission according to the obtained information related to the signal transmission configuration.