Autonomous UE Resource Selection for Delay-Affected Grant Transmissions
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Solution Overview
Problem
In wireless communication systems, particularly with non-terrestrial TRPs like satellites, propagation delays can cause channel conditions to change faster than the coherence time, leading to outdated resource allocations in grant-based transmissions, resulting in sub-optimal capacity performance due to mismatched channel conditions.
Innovation Solution
The UE autonomously selects resources, such as MCS, based on local channel conditions and indicates the selected resources to the network, allowing for dynamic adaptation to instantaneous conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the TRP sends a grant allocating resources based on uplink channel conditions measured at the TRP, then the resources are allocated according to the channel conditions at the time of measurement, but by the time the grant is received and data is sent, the channel conditions have changed making the resource allocation outdated
Solution Approach 1:
The UE autonomously selects the MCS for its granted transmission based on its own measurements of current channel conditions, rather than relying on the TRP's earlier measurements. This self-service approach allows the UE to adapt to current channel conditions independently, resolving the timing mismatch caused by propagation delays in satellite communications.
2Adaptability or versatility
If the TRP performs periodic channel estimation to track channel conditions and allocate optimal resources, then link adaptation is maintained, but with long propagation delays the allocated resources become outdated before the transmission occurs
Solution Approach 1:
Instead of the TRP selecting the MCS based on its measurements and instructions to the UE, the approach is inverted: the UE autonomously selects the MCS based on its own measurements of current channel conditions. This inversion allows the transmitting end to have direct access to current channel state information, ensuring reliable resource allocation despite propagation delays.
3Productivity
If the UE autonomously selects resources such as MCS based on local channel conditions, then the resource selection matches current channel conditions improving link capacity, but the UE must indicate the selected resources to the receiving device
Solution Approach 1:
The patent extracts the MCS selection function from the TRP's control domain and places it in the UE's autonomous domain. The UE selects the MCS independently based on current channel conditions and includes this selection in its transmission, eliminating the need for complex round-trip signaling while improving link capacity through current channel matching.
Data Source
AI summary
In some wireless communication scenarios, a situation may arise in which the propagation delay between the user equipment (UE) and the transmit-and-receive point (TRP) is such that by the time a grant is received by the UE and data is transmitted by the UE according to the grant, the channel conditions have changed. In some embodiments, the UE instead autonomously selects at least one resource for a grant-based data transmission. For example, the UE may select the resource based on channel conditions locally measured by the UE. A method may include a UE receiving a flag and a grant scheduling at least a time resource for data. The flag indicates that the UE is to transmit the data using at least one resource selected by the UE. The UE transmits the data on the time resource using the at least one resource selected by the UE.