UDCH-Based UE Detection for Low-Overhead PRACH Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently detecting user equipment (UE) in ultra-high frequency bands due to increased signal attenuation, necessitating numerous beams and resulting in significant resource overhead, delay, and wasted resources.
Innovation Solution
A method and device that utilize user detection channels (UDCH) to identify the optimal beam direction for UE communication, allowing for efficient PRACH resource allocation by detecting UE presence before configuring resources, thereby reducing delay and resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If numerous beams are used to compensate for signal attenuation in ultra-high frequency bands, then coverage is improved, but resource overhead and delay increase significantly
Solution Approach 1:
The base station performs preliminary detection of UE presence on UDCH resources before the actual random access procedure. By detecting whether a UE intends to access using a specific beam beforehand, the system avoids unnecessary beam sweeping and resource allocation for inactive UEs, thereby reducing random-access delay while maintaining coverage through selective beam usage
Solution Approach 2:
The random access procedure is segmented into two stages: first, UE presence detection on UDCH resources to identify active UEs; second, PRACH resource allocation only for detected UEs. This segmentation allows the system to use numerous beams for coverage without incurring the full overhead of beam sweeping for all UEs, as only active UEs proceed to the second stage
2Area of stationary object
If numerous beams are used to compensate for signal attenuation in ultra-high frequency bands, then coverage is improved, but resource overhead increases significantly
Solution Approach 1:
The base station performs preliminary detection of UE presence on UDCH resources before the actual random access procedure. By detecting whether a UE intends to access using a specific beam beforehand, the system avoids unnecessary beam sweeping and resource allocation for inactive UEs, thereby reducing resource overhead while maintaining coverage through selective beam usage
Solution Approach 2:
The random access procedure is segmented into two stages: first, UE presence detection on UDCH resources to identify active UEs; second, PRACH resource allocation only for detected UEs. This segmentation allows the system to use numerous beams for coverage without incurring the full overhead of beam sweeping for all UEs, as only active UEs proceed to the second stage
3Ease of operation
If traditional random access procedures are used without preliminary UE detection, then procedure simplicity is maintained, but delay and resource waste increase
Solution Approach 1:
A preliminary UE presence detection step is added before the traditional random access procedure. The base station monitors UDCH resources to detect whether a UE intends to access using a specific beam before initiating the full random access sequence. This preliminary action filters out inactive UEs, reducing the number of beams that need to be swept and resources that need to be allocated, thereby reducing delay while maintaining procedural simplicity through a clear two-stage process
Data Source
AI summary
The present disclosure relates to an ultra-high frequency communication system such as 5G or 6G for supporting a higher data transmission rate. A method performed by a base station in a wireless communication system may be provided in the present disclosure. The method comprises the steps of: transmitting a first signal to user equipment (UE), the first signal including UE detection channel (UDCH) resource information for UE selection; and receiving, from the UE, a second signal including UE detection information on the basis of the UDCH resource information in an observation period corresponding to a period for detecting UE, wherein the observation period may be greater than or equal to a preamble length included in the second signal.