PRACH Configuration for Super Real-Time Service Random Access
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Solution Overview
Problem
Current 5G systems lack the ability to efficiently allocate short Transmission Time Interval (TTI) resources during the random access process for user equipment with super real-time services, leading to increased transmission delays.
Innovation Solution
A method where user equipment receives configuration information for a Physical Random Access Channel (PRACH) or preamble dedicated for super real-time services and transmits a preamble to the base station, triggering the allocation of a short TTI resource, enabling the base station to respond with resource allocation information for reduced delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a user equipment transmits data and signaling using conventional TTI resources during random access, then the system maintains compatibility with existing LTE infrastructure, but the transmission delay exceeds the 1ms requirement for super real-time services
Solution Approach 1:
The base station pre-configures and notifies the user equipment of short TTI resource information before the random access process begins. This preliminary action ensures that when the user equipment needs to transmit super real-time service data, the short TTI resources are already available and allocated, eliminating the delay that would otherwise occur from using conventional TTI resources.
Solution Approach 2:
The system changes the TTI parameter from the conventional longer duration to a shortened TTI duration (less than 1ms) specifically for super real-time service transmissions. This parameter change enables the user equipment to transmit data with reduced transmission time, meeting the 1ms delay requirement while maintaining compatibility with existing LTE infrastructure for non-real-time services.
2Loss of time
If the base station allocates short TTI resources dynamically during random access, then the system achieves low latency for super real-time services, but the signaling interaction complexity increases
Solution Approach 1:
The base station performs the complex task of short TTI resource allocation and configuration in advance, before the random access process begins. By notifying the user equipment of the short TTI resource information beforehand, the base station eliminates the need for complex real-time resource management during the actual random access signaling interaction, thus reducing signaling delay while managing complexity efficiently.
Solution Approach 2:
The short TTI resource configuration acts as an intermediary between the base station's resource management capabilities and the user equipment's transmission needs. This pre-configured resource information mediates the interaction by providing a ready-made solution that both parties can use without complex real-time negotiations, simplifying the signaling process while enabling low-latency transmission.
3Adaptability or versatility
If the system supports both conventional and short TTI resources, then it meets diverse service requirements, but the resource management complexity increases
Solution Approach 1:
The system segments resource allocation by service type, dedicating short TTI resources specifically for super real-time services while maintaining conventional TTI resources for other services. This segmentation allows the system to support diverse service requirements simultaneously without requiring complex dynamic allocation for all services, as each service type has its designated resource pool.
Solution Approach 2:
The system applies different resource allocation qualities locally: short TTI resources with optimized parameters are allocated specifically for super real-time services where low latency is critical, while conventional TTI resources are used for other services where such optimization is unnecessary. This local quality approach enables the system to meet diverse service requirements without uniformly increasing complexity across all resource allocations.
Data Source
AI summary
Provided are a random access method, apparatus and system. The method includes: receiving, by a user equipment, configuration information of a Physical Random Access Channel (PRACH) dedicated for a super real-time service and/or configuration information of a preamble dedicated for the super real-time service notified by a base station; and when the user equipment has the super real-time service and has a short Transmission Time Interval (TTI) support capability, by the user equipment, transmitting a preamble to the base station through a PRACH resource dedicated for the super real-time service or transmitting the preamble dedicated for the super real-time service to the base station according to the configuration information of the PRACH dedicated for the super real-time service and/or the configuration information of the preamble dedicated for the super real-time service, so as to trigger the base station to allocate a short TTI resource to the user equipment.