Uplink Resource Allocation for Low Latency Wireless Systems
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Solution Overview
Problem
Current mobile communication systems face challenges in reducing transmission latency for low latency services, managing resource requests based on UE capability, and handling failed resource requests efficiently, particularly in fast RRC connection setups and reestablishments.
Innovation Solution
A method for allocating uplink resources in a wireless communication system that involves transmitting a message with UL resource request information, receiving a response, and utilizing allocated resources, including UE capability type, grant offset, and grant size, to optimize resource allocation and reduce latency, with options for implicit or explicit response handling and fallback methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional UL resource grant method is used, then reliability is maintained, but transmission latency increases
Solution Approach 1:
The eNB pre-allocates UL resources to the UE before the UE actually needs to transmit data. The UL resource grant includes a time offset indicating when the UE can use the allocated resources, allowing the UE to skip the conventional SR/BSR request process and transmit data immediately at the granted time, thereby reducing transmission latency while maintaining reliability through predefined resource allocation
Solution Approach 2:
The patent introduces dynamic UL resource allocation where the eNB can adjust the grant time offset based on UE capability type (fast or normal processing). The system dynamically selects between fast resource allocation (for low latency services) and normal resource allocation (for reliability-critical services), allowing flexible adaptation to different service requirements without compromising overall system reliability
2Reliability
If UL resource request is transmitted frequently, then resource allocation reliability improves, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring or frequent SR/BSR transmissions, the UE monitors PDCCH only at specific periodic intervals determined by the UL grant time offset. The eNB schedules UL grants at predetermined time points, allowing the UE to enter sleep mode between monitoring instances, thereby reducing power consumption while maintaining reliable resource allocation through periodic checks
3Loss of time
If fast RRC connection setup is implemented, then transmission latency reduces, but device complexity increases
Solution Approach 1:
The eNB performs preliminary assessment of UE capability type (fast or normal processing) during initial connection setup and pre-configures the appropriate UL resource allocation strategy. This preliminary classification allows the system to select optimized RRC procedures in advance, reducing connection setup time for fast-capable UEs without significantly increasing overall system complexity through standardized capability reporting mechanisms
4Speed
If UL grant offset is reduced, then transmission speed improves, but processing reliability worsens
Solution Approach 1:
The patent applies different UL grant offset values based on local UE characteristics (capability type). Fast-processing UEs receive smaller offsets enabling quicker transmission, while normal-processing UEs receive larger offsets ensuring adequate processing time. This localized adaptation of grant parameters optimizes transmission speed for each UE type without compromising processing reliability, as each UE receives offsets appropriate to its processing capabilities
Data Source
AI summary
The present specification relates to a method for allocating an uplink resource in a wireless communication system which supports low latency service. The method performed by a terminal comprises the steps of: transmitting, to a base station, a first message comprising an uplink resource request information element (UL resource request IE) to request uplink resource allocation; receiving, from a base station, a second message comprising a response to the UL resource request IE; receiving allocation of the uplink resource from the base station on the basis of the received response; and transmitting a third message to the base station by using the allocated uplink resource.