PUSCH RACH Preamble Mapping With OCC Resource Partitioning
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Solution Overview
Problem
The random access channel (RACH) process in wireless communication systems, particularly in 5G NR, is prone to collisions, leading to inefficiencies and failures, which existing technologies have not adequately addressed.
Innovation Solution
Implementing a method for partitioning RACH resources based on orthogonal cover codes (OCC) to differentiate between wireless devices supporting and not supporting OCC for data transmission, allowing for efficient preamble mapping and multiplexing order management to reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RACH resources are shared among all wireless devices, then resource utilization is high, but collision probability increases
Solution Approach 1:
The patent segments RACH resources by creating separate resource pools for OCC-supported devices and non-OCC devices. This segmentation divides the previously shared resource space into distinct domains, allowing each device type to access dedicated resources without interfering with the other, thereby reducing collision probability while maintaining high overall resource utilization.
Solution Approach 2:
The patent introduces an additional dimension for resource differentiation by classifying devices based on OCC support capability. This creates a new resource allocation dimension beyond traditional time-frequency resources, enabling the system to accommodate diverse device capabilities without sacrificing resource efficiency or increasing collisions.
2Reliability
If RACH resources are partitioned for different device classes, then collision probability is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring and signaling the partitioned RACH resource structure to devices before the random access procedure begins. The network device provides clear configuration information about which resources are allocated to which device class, allowing devices to independently select appropriate resources without real-time complex coordination, thus reducing operational complexity.
Solution Approach 2:
The patent applies local quality by tailoring resource allocation specifically to each device class's capabilities. OCC-supported devices receive resources optimized for their orthogonal coding capability, while non-OCC devices receive traditional resources. This localized optimization simplifies the overall system by addressing each subgroup's specific requirements rather than managing a single complex unified allocation.
3Quantity of substance
If OCC is applied to data transmission during RACH, then multiplexing capacity is improved, but device compatibility is reduced
Solution Approach 1:
The patent segments the device population into two distinct groups based on OCC support capability. This segmentation allows the system to apply advanced OCC-based multiplexing to capable devices, maximizing their multiplexing capacity, while providing traditional non-OCC resources to legacy devices, ensuring universal compatibility. Both groups operate in parallel without interference.
Solution Approach 2:
The patent achieves universality by creating a dual-resource architecture that serves both OCC-capable and non-OCC devices within the same system. The network simultaneously maintains traditional RACH resources for legacy devices and OCC-enhanced resources for advanced devices, making the system adaptable to multiple device types and capability levels without requiring all devices to support OCC.
Data Source
AI summary
The apparatus may be a wireless device configured to receive a configuration for a partitioning of a set of RACH resources between a first class of wireless devices supporting OCC for data transmission during a RACH procedure and a second class of wireless devices not supporting OCC for data transmission, transmit, based on the configuration, a preamble associated with the RACH procedure via a first RACH resource in the set of RACH resources that is associated with the first class of wireless devices, and transmit a data transmission associated with the RACH procedure via a second RACH resource in the set of RACH resources selected based on a mapping of the preamble and at least one of a multiplexing order and an OCC index associated with an OCC applied to the data transmission.