Base Station PUSCH Resource Selection for Two-Step Random Access

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Solution Overview

Problem

In wireless communication systems, particularly in 5G NR networks, the two-step random access procedure faces interference issues due to overlapping cell coverage between base stations, leading to performance degradation, increased latency, and power consumption, especially for ultra-reliable low-latency communication (URLLC) and massive machine-type communication (mMTC) devices.

Innovation Solution

A method where a base station extracts information from neighboring base stations with overlapping cell coverage to select a physical uplink shared channel (PUSCH) resource for user equipment (UE) that avoids interference by optimizing frequency and time domain parameters, DMRS configurations, and scrambling identities, ensuring non-overlapping resource allocation for MsgA messages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If base stations use overlapping cell coverage for wireless communication, then network coverage and connectivity are improved, but interference between neighboring base stations increases causing performance degradation

Engineering Contradiction:

Improvecell coverage areaVSAvoidinterference

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by configuring different MsgA-PUSCH resources (frequency, time, DMRS, scrambling) for different local areas or cells. Each base station customizes the resource configuration parameters locally based on its specific neighboring base stations, creating locally optimized quality without affecting global coverage. This resolves the contradiction by maintaining overlapping coverage areas while reducing local interference through differentiated resource allocation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes multiple parameters including frequency domain resources, time domain resources, DMRS configurations, and scrambling identities to avoid interference. By modifying these parameters differently across neighboring base stations, the system maintains overlapping cell coverage while ensuring that MsgA-PUSCH transmissions do not interfere with each other, thus resolving the contradiction between coverage area and interference.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If MsgA-PUSCH resources are not optimized for overlapping cells, then resource allocation is simple, but interference causes increased latency and retransmissions

Engineering Contradiction:

Improveresource allocation complexityVSAvoidlatency

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring MsgA-PUSCH resources with differentiated parameters before actual transmission occurs. Base stations exchange information about their neighboring stations and pre-determine non-interfering resource allocations. This advance planning prevents interference-related retransmissions and latency without adding complexity during actual operation, as the resource allocation decisions are made in advance.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If MsgA-PUSCH resources overlap between neighboring base stations, then resource utilization is high, but interference degrades communication reliability

Engineering Contradiction:

Improveresource utilizationVSAvoidcommunication reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent ensures each local cell has uniquely configured MsgA-PUSCH resources (different frequency, time, DMRS, or scrambling parameters) while maintaining high overall resource utilization. This local differentiation prevents interference between neighboring cells, ensuring communication reliability is not degraded despite overlapping coverage areas.

Inventive Principle:

Principle #3Local quality

4Device complexity

If base stations use identical MsgA-PUSCH configurations, then configuration complexity is low, but interference from neighboring cells increases

Engineering Contradiction:

Improveconfiguration complexityVSAvoidinterference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent changes multiple configuration parameters including frequency domain resources, time domain resources, DMRS configurations, and scrambling identities to differentiate between neighboring base stations. By modifying these parameters, the system maintains relatively simple configuration procedures while effectively avoiding interference, thus resolving the contradiction between configuration complexity and interference levels.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11889507B2Base station resource selection for two step random access procedure

Publication Date: 2024.01.30 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may extract, from a neighboring base station with cell coverage that overlaps cell coverage of the base station, information associated with user equipment (UE) transmission of MsgA messages. The base station may select, based at least in part on the information, a physical uplink shared channel (PUSCH) resource to allocate to a UE for transmission of a MsgA message. The base station may transmit, to the UE, an allocation of the PUSCH resource. Numerous other aspects are described.