D2D Resource Allocation via Uplink Quality Metrics
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Solution Overview
Problem
Existing device-to-device (D2D) communication systems do not adequately consider the quality of uplink transmission from a relay UE to a base station when allocating radio resources for sidelink transmission, leading to inconsistencies in bandwidth or throughput and potential waste of resources.
Innovation Solution
An apparatus and method that determine device-to-device radio resources for sidelink transmission from a remote terminal to a relay terminal while considering the quality metric of the uplink transmission from the relay terminal to the base station, ensuring consistent performance and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If radio resources for sidelink transmission are allocated without considering uplink quality metrics, then resource allocation simplicity is maintained, but bandwidth consistency between sidelink and uplink transmissions deteriorates
Solution Approach 1:
The base station receives uplink quality metrics (such as channel state information, signal-to-noise ratio, or throughput measurements) from relay UEs and uses this feedback to dynamically adjust sidelink resource allocation. This closed-loop feedback mechanism ensures that sidelink bandwidth is consistent with uplink capabilities while maintaining efficient resource utilization.
Solution Approach 2:
The base station performs preliminary assessment of uplink quality metrics before allocating sidelink radio resources. By evaluating uplink channel conditions in advance, the base station can pre-determine appropriate sidelink resource allocations that will maintain bandwidth consistency, avoiding the need for complex real-time adjustments during active transmission.
2Speed
If sidelink transmission resources are allocated without considering uplink quality, then resource allocation speed is maintained, but buffer overflow in relay UE occurs
Solution Approach 1:
The base station evaluates uplink quality metrics and determines appropriate sidelink resource allocations before actual sidelink transmission begins. This preliminary resource allocation ensures that relay UEs are not assigned more sidelink data than their uplink buffer can handle, preventing overflow while maintaining fast allocation speeds.
Solution Approach 2:
The base station dynamically adjusts sidelink resource allocation parameters (such as resource block allocation, modulation and coding scheme, or transmission power) based on uplink quality metrics. When uplink conditions are poor, the base station reduces sidelink resource allocation to prevent buffer overflow; when conditions are good, allocation is increased to maximize throughput.
3Adaptability or versatility
If sidelink resources are allocated independently of uplink quality, then resource allocation flexibility is maintained, but resource utilization efficiency deteriorates
Solution Approach 1:
The sidelink resource allocation mechanism is made dynamic by continuously adapting to changes in uplink quality metrics. The base station can flexibly adjust resource allocations in response to varying channel conditions, traffic demands, and relay UE capabilities, thereby maintaining both flexibility and high resource utilization efficiency simultaneously.
Solution Approach 2:
The base station changes key allocation parameters (resource blocks, time slots, power levels) based on uplink quality assessments. This parameter adaptation allows the system to maintain flexibility in responding to different scenarios while optimizing resource utilization efficiency by allocating resources according to actual channel conditions and relay UE performance.
Data Source
AI summary
An apparatus (1 or 3) determines a device-to-device (D2D) radio resource to be allocated to one or more D2D transmissions from at least one remote terminal (1) to a first relay terminal (2) while considering a quality metric of an uplink from the first relay (2) terminal to a base station (3). In this way, for example, it is possible to contribute to avoiding inconsistency of performance between sidelink transmission from the remote terminal to the relay terminal and uplink transmission from the relay terminal to the base station.