RACH Resource Partitioning for 5G Uplink Coverage
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Solution Overview
Problem
The 5G communication system faces challenges in efficiently providing RACH resource partitioning information for various feature combinations, leading to issues with load balancing and performance, as not all possible combinations are supported due to a lack of RACH resources and the complexity of managing numerous feature combinations in a single cell.
Innovation Solution
The method involves defining RACH-related parameters to be jointly applied to multiple feature combinations and exclusively to one feature combination, reducing signaling and processing loads, and providing UE with efficient RACH partitioning information, allowing for better resource allocation and load balancing by prioritizing feature combinations and using specific RACH configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RACH resources are divided for each feature combination to achieve load balancing, then load balancing performance is improved, but the complexity of managing numerous feature combinations increases and not all combinations can be supported
Solution Approach 1:
The patent segments RACH resources by dividing them into multiple RACH occasions within a RACH occasion group, where each RACH occasion can be independently configured for different feature combinations. This allows fine-grained resource allocation without requiring separate resource pools for each feature combination, thus reducing overall management complexity while maintaining load balancing capability.
Solution Approach 2:
The patent creates a universal RACH occasion group structure that can serve multiple feature combinations simultaneously. By configuring multiple RACH occasions within a single RACH occasion group and allowing flexible association between occasions and features, the system achieves multi-functionality where one RACH resource structure supports diverse feature combinations without requiring separate dedicated resources for each.
2Manufacturing precision
If separate RACH resources are allocated for each feature combination, then resource allocation precision is improved, but the signaling overhead and processing load increase
Solution Approach 1:
The patent merges multiple RACH occasion configurations into a unified RACH occasion group structure. Instead of signaling separate resource allocations for each feature combination, the system signals a single RACH occasion group containing multiple RACH occasions, reducing signaling overhead. The precise allocation is achieved through selective activation of specific RACH occasions within the group for different feature combinations.
Solution Approach 2:
The patent introduces dynamic configuration where RACH occasions within a group can be flexibly assigned to different feature combinations based on current network conditions and feature requirements. This dynamic approach allows the system to maintain precise resource allocation adaptability without the rigid signaling overhead of static separate allocations for each feature combination.
3Reliability
If PRACH repetition is performed for random access procedure, then uplink coverage is improved, but the RACH resource consumption increases
Solution Approach 1:
The patent implements PRACH repetition by configuring multiple RACH occasions within a RACH occasion group that can be continuously utilized for random access procedures. Instead of consuming separate resource pools for repeated transmissions, the system reuses the structured RACH occasion group framework, maintaining continuous useful action for uplink coverage enhancement while controlling overall resource consumption through the organized occasion structure.
Data Source
AI summary
A method and apparatus to enhance uplink coverage is provided. Method for enhancing uplink coverage includes receiving a SIB1, initiating a random access procedure and performing PRACH repetition for the random access procedure in case that a sets of parameters related to preamble partitions selected for the random access procedure is associated with PRACH repetition. The SIB1 comprises a set of parameters related to serving cell configuration, wherein the set of parameters related to serving cell configuration comprises one or more sets of parameters related to RACH, a set of parameters related to PUSCH and one or more parameters indicating one or more thresholds. Each of the one or more sets of parameters related to RACH comprises a set of parameters related to generic RACH information and one or more sets of parameters related to preamble partitions.