PUSCH Contention Resolution Repetition for Random Access Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling contention resolution messages during random access procedures, particularly in scenarios where message repetitions are required, due to inadequate resource allocation and power adaptation techniques.
Innovation Solution
The solution involves sending a contention resolution message with repetitions using independent or coupled resource configurations, dynamic or semi-static resource allocation, and power adaptation based on multiple parameter sets, along with techniques to indicate UE capabilities through preamble and resource selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message repetitions are sent to improve reliability, then reliability is improved, but resource utilization deteriorates
Solution Approach 1:
The resource allocation is segmented into multiple independent configuration sets (first set and second set of resources), each with distinct parameters such as time resources, frequency resources, and redundancy versions. This allows the system to allocate resources efficiently for each repetition while maintaining independence in resource management, thereby improving reliability without excessive resource consumption.
Solution Approach 2:
The patent implements dynamic resource allocation where the UE can be configured with multiple resource sets and selectively use different configurations based on channel conditions and transmission requirements. The resource configuration can be dynamically adjusted through RRC signaling, allowing the system to optimize resource utilization while ensuring reliable message transmission through repetitions.
2Reliability
If multiple resource configurations are used for repetitions, then message transmission reliability is improved, but device complexity increases
Solution Approach 1:
The resource configurations are pre-configured through RRC signaling before the actual transmission occurs. The network provides the UE with multiple sets of resource configurations in advance, including time resources, frequency resources, and redundancy version parameters. This preliminary configuration reduces the complexity during actual transmission as the UE can directly select from pre-defined configurations rather than managing complex real-time resource allocation.
Solution Approach 2:
The patent introduces an intermediary configuration mechanism where the network side provides resource configuration sets through RRC signaling, acting as a mediator between the UE's transmission needs and the network's resource management. This intermediary layer simplifies the UE's device complexity by offloading the complex resource management decisions to the network while still enabling reliable repeated transmissions.
3Productivity
If independent resource sets are configured for message and repetition, then transmission efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The resource allocation is segmented into distinct independent sets: a first set for the initial contention resolution message and a second set for repetitions. Each set contains complete configuration parameters including time resources, frequency resources, and redundancy versions. This segmentation allows efficient transmission by clearly separating message and repetition resources, while the independent configuration simplifies management despite the increased number of parameters.
Data Source
AI summary
A method may include sending a contention resolution message for a random access procedure from a user equipment (UE) through a physical uplink channel in a wireless communication network, and sending a repetition of the contention resolution message from the UE through the physical uplink channel. The physical uplink channel may include a physical uplink shared channel (PUSCH). The method may further include selecting a preamble from a first preamble group corresponding to a capability of the UE to send the repetition of the contention resolution message, and sending the preamble from the UE. Selecting the preamble from the first preamble group may include selecting a preamble from a first preamble sub-group corresponding to the capability of the UE to send the repetition of the contention resolution message.