Conditional Uplink Reporting for Cell and Beam Switching
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Solution Overview
Problem
Communication devices in LTE and LTE-A systems face challenges in handling uplink transmissions during cell/beam switch procedures due to the lack of clear indications from the network, leading to inefficient use of UL resources.
Innovation Solution
A communication device and network method involving the transmission of a first UL channel in response to specific conditions, followed by a second UL channel with a measurement report, optimizing resource usage by avoiding periodic reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic measurement report transmission is performed, then the network can obtain channel state information, but UL resources are occupied unnecessarily when cell/beam switch is not required
Solution Approach 1:
The measurement report transmission is changed from a static periodic operation to a dynamic conditional operation. The communication device determines whether to transmit the measurement report based on real-time conditions: whether the measured reference signal quality meets a threshold and whether a cell/beam switch indication has been received. This dynamic adjustment allows the system to maintain reliable channel state information acquisition while avoiding unnecessary UL resource occupation when cell/beam switch is not required.
Solution Approach 2:
The communication device autonomously determines when to transmit measurement reports based on local measurements and received indications, without requiring explicit periodic scheduling from the network. The device serves itself by making intelligent decisions about resource usage based on the actual need for cell/beam switching, thereby eliminating wasteful UL transmissions while ensuring reports are sent when necessary.
2Productivity
If measurement report transmission is performed without cell/beam switch indication, then UL resources are wasted, but the device cannot determine when to perform cell/beam switch procedure
Solution Approach 1:
The network provides a cell/beam switch indication as feedback to the communication device. This indication serves as a trigger that tells the device when to perform the cell/beam switch procedure and when to transmit measurement reports. The feedback mechanism ensures that measurement report transmission is aligned with actual cell/beam switching needs, preventing resource waste while maintaining procedural efficiency.
Solution Approach 2:
The network sends the cell/beam switch indication in advance to prepare the communication device for upcoming cell/beam switch procedures. This preliminary action allows the device to have the measurement report ready and transmit it at the appropriate time, ensuring both efficiency in the switch procedure and optimal UL resource usage.
3Quantity of substance
If conditional transmission based on RS measurement is implemented, then UL resources are used efficiently, but the system complexity increases
Solution Approach 1:
The transmission control logic is segmented into distinct functional blocks: a measurement unit that measures reference signal quality, a determination unit that compares measurements against thresholds and checks for switch indications, and a transmission unit that executes reporting based on determination results. This segmentation makes the complex control logic more manageable and implementable while achieving efficient UL resource usage.
Data Source
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AI summary
A method for a communication device (14, 20) handling uplink, UL, transmission includes: receiving a configuration from a network (12, 20), wherein the configuration comprises a set of reference signals, RSs (302); performing at least one measurement for the set of RSs, to generate a measurement report (304); transmitting a first UL channel to the network (12, 20) in response to at least one RS of the set of RSs satisfying a condition (306); and transmitting a second UL channel comprising the measurement report to the network (12, 20) (308).