UE Beam Management via PCell Indication for SCell Activation
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G networks, face challenges in efficiently managing beamforming for high-frequency bands due to increased path loss and the limited number of concurrent high-gain beams that can be formed, leading to reduced cell coverage and sensitivity to interference and mobility issues.
Innovation Solution
The proposed method involves a User Equipment (UE) receiving an SCell activation/deactivation MAC control element and using a beam indication from a PCell to derive and utilize specific beams for Downlink (DL) or Uplink (UL) transmissions in Secondary Cells (SCells), enabling more effective beam management and coverage by activating/deactivating SCells based on MAC control elements and beam indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beamforming is used in high-frequency bands to increase path loss compensation, then transmission efficiency is improved, but the number of concurrent high-gain beams is limited reducing cell coverage
Solution Approach 1:
The network divides cell coverage into multiple sectors, each served by a dedicated beam. This segmentation allows the system to maintain high-gain directional beams while collectively covering the entire cell area, resolving the contradiction between beam directionality and coverage area.
Solution Approach 2:
The patent introduces spatial dimension management by assigning different three-dimensional spatial domains to different beams. This allows multiple high-gain beams to coexist by operating in different spatial dimensions, thereby maintaining both transmission efficiency and overall cell coverage.
2Reliability
If beamforming is used to increase signal gain, then transmission quality is improved, but sensitivity to interference and mobility issues increases
Solution Approach 1:
The patent applies different beam characteristics to different spatial regions and service scenarios. By optimizing beam parameters locally for specific areas and interference conditions, the system maintains high transmission quality while reducing sensitivity to interference in particular locations.
Solution Approach 2:
The beamforming system dynamically adjusts beam parameters such as direction, width, and power based on real-time channel conditions, interference levels, and mobility states. This dynamic adaptation allows the system to maintain transmission quality while being resilient to changing interference and mobility conditions.
3Productivity
If multiple SCells are activated to increase capacity, then data throughput is improved, but battery consumption increases
Solution Approach 1:
The network employs periodic activation and deactivation of SCells based on traffic demand patterns. This periodic action allows the system to maintain high data throughput when needed while conserving battery power during low-activity periods, resolving the contradiction between productivity and energy consumption.
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a UE (User Equipment). In one embodiment, the method includes the UE receiving an SCell activation/deactivation MAC (Medium Access Control) control element to activate the SCell. The method further includes the UE activates the SCell based on the SCell activation/deactivation MAC control element. The method also includes the UE receiving a beam indication by a MAC control element via the PCell, wherein the beam indication includes a cell index and the beam indication is used to derive at least one beam to be used in the SCell. In addition, the method includes the UE using the at least one beam for a DL (Downlink) transmission or an UL (Uplink) transmission in the SCell.