Uplink Semi-Persistent Resource Allocation for Latency Reduction
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Solution Overview
Problem
The existing LTE system faces significant challenges in reducing peer-to-peer latency for real-time traffic, such as automatic driving and industrial automatic control, which is exacerbated by the legacy uplink data transmission scheme causing substantial latency and resource wastage due to semi-persistent resource allocation.
Innovation Solution
An uplink data transmission method where UEs receive resource indication information from the base station to dynamically determine and utilize available semi-persistent resources, reducing latency and optimizing resource allocation by allowing other UEs to use idle resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If semi-persistent resources are allocated to a UE for uplink data transmission, then transmission latency is reduced, but radio resource utilization deteriorates when the UE has no data to transmit
Solution Approach 1:
The patent implements dynamic resource allocation where semi-persistent resources can be temporarily taken over by other UEs when the original UE has no data to transmit. The base station dynamically adjusts resource allocation based on actual transmission needs, allowing resources to transition between different UEs without full reconfiguration, thus reducing both latency and resource waste
Solution Approach 2:
The system changes the state of resource allocation from static (dedicated to one UE) to flexible (shareable among multiple UEs). By introducing a resource indication mechanism that modifies the allocation parameters dynamically, the system optimizes both latency performance and resource utilization efficiency
2Loss of energy
If semi-persistent resources are shared by multiple UEs, then resource utilization improves, but uplink interference increases due to collisions
Solution Approach 1:
The base station sends resource indication information to UEs based on feedback about current resource usage and interference conditions. This feedback mechanism allows the system to coordinate resource sharing among multiple UEs, allocating semi-persistent resources to different UEs at different times or frequencies to avoid collisions while maintaining high utilization
Solution Approach 2:
The base station pre-configures semi-persistent resources and provides advance indication to UEs about which resources they can use. This preliminary allocation and indication prevents random access conflicts by establishing a coordinated sharing scheme before transmission occurs, reducing interference while improving utilization
Data Source
AI summary
An uplink data transmission method and apparatus for latency reduction and a communications system. The uplink data transmission method includes: receiving resource indication information transmitted by a base station; the resource indication information indicating availability of using the semi-persistent resources at one or more TTIs or subframes by the first UE; determining a transmission resource from the semi-persistent resources according to the resource indication information when uplink data is needed to be transmitted; and transmitting the uplink data by using the transmission resource. Hence, not only latency of the uplink data may be reduced outstandingly, but also the semi-persistent resources may be allocated to other UEs with no waste of semi-persistent resources as much as possible, thereby improving resource utilization efficiency and transmission latency performance of the UE.