SCell Beam Failure Recovery Request PUCCH Resource Segmentation
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Solution Overview
Problem
The existing 3GPP Rel-15/16 technical standards lack specifications for resolving collisions between Beam Failure Recovery (BFR) Signal (BFR-SR) transmissions and Uplink Control Information (UCI) on PUCCH resources, leading to inefficient or failed BFR procedures due to delayed or failed notifications, especially in Secondary Cell (SCell) scenarios.
Innovation Solution
A method for transmitting SCell BFRQ information involves configuring a dedicated SR-like PUCCH resource for BFR-SR transmission, prioritizing it over other UCI types, and using specific rules to manage collisions, ensuring timely delivery of BFR information by differentiating and prioritizing BFR-SR transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a dedicated SR-like PUCCH resource is used for BFR-SR transmission, then the timeliness of BFR notification is improved, but collision with UCI on PUCCH resource occurs
Solution Approach 1:
The patent segments the PUCCH resource into two distinct types: a first PUCCH resource dedicated for BFR-SR transmission and a second PUCCH resource for other UCI transmission. This segmentation prevents collision between BFR-SR and UCI by assigning separate resources to each function, thereby maintaining both timeliness and reliability of BFR notification.
Solution Approach 2:
The patent introduces a MAC control element as an intermediary mechanism to handle collisions between BFR-SR and UCI. When collision occurs, the MAC control element carries indication information that enables the receiving end to correctly identify and process the BFR-SR transmission, ensuring reliable delivery even when resources overlap.
2Productivity
If BFR-SR transmission is prioritized over other UCI, then BFR procedure efficiency is improved, but collision resolution complexity increases
Solution Approach 1:
By segmenting PUCCH resources into dedicated BFR-SR resources and general UCI resources, the patent establishes clear transmission priorities without requiring complex collision resolution mechanisms. The dedicated resource ensures BFR-SR is transmitted first, simplifying the overall system complexity while maintaining high efficiency.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the MAC control element with indication information before transmission. This pre-prepared indication allows the receiving end to immediately identify BFR-SR transmissions and process them correctly, eliminating the need for complex real-time collision resolution algorithms.
Data Source
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AI summary
A method of transmitting secondary cell (SCell) beam failure recovery request (BFRQ) information in a beam failure recovery (BFR) procedure for a user equipment (UE) is disclosed. The method comprises receiving, from a base station (BS), at least one scheduling request (SR) resource configuration and at least one SR configuration, triggering a first SR-for-BFR procedure for requesting an uplink (UL) resource according to a first of the at least one SR configuration and corresponding to an SR-for-BFR transmission, wherein one of the at least one SR resource configuration indicates a first physical uplink control channel (PUCCH) resource for the SR-for-BFR transmission, and transmitting, to the BS, uplink control information (UCI) on a second PUCCH resource, wherein a payload of the UCI includes an indication associated with the SR-for-BFR transmission.