Power Headroom Report MAC Control Element for Non-Serving Cells
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting Power Headroom Reports (PHR) related to non-serving cells, particularly due to limited radio resources and the need to overcome delay or latency in data transmission.
Innovation Solution
A method for a User Equipment (UE) in a wireless communication system to determine power headroom information for multiple cells, generate a PHR Medium Access Control (MAC) control element (CE) including this information, and transmit it to the network. The method specifically handles scenarios where there is no transmission through a serving cell, allowing the UE to include power headroom information only for associated non-serving cells in the PHR MAC CE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE includes power headroom information for all configured cells in the PHR MAC CE, then the network receives complete power headroom information, but the PHR message size increases and radio resources are consumed inefficiently
Solution Approach 1:
The patent extracts and removes power headroom information for non-serving cells from the PHR MAC CE when there is no data transmission through those cells. This selective extraction reduces the message size while maintaining necessary information for scheduling decisions, resolving the contradiction between information completeness and message size efficiency.
2Loss of information
If the UE transmits PHR information for cells with no data transmission, then the network receives comprehensive power headroom data, but the transmission time and radio resources are wasted
Solution Approach 1:
The patent extracts and excludes power headroom information for cells where no data transmission occurs. By removing unnecessary information about non-serving cells without active data transmission, the patent reduces transmission time and radio resource consumption while preserving essential power headroom information for cells with active data transmission that are critical for scheduling decisions.
3Device complexity
If the UE uses implicit PHR formatting, then the PHR MAC CE structure is simpler, but the network cannot easily identify which cells have power headroom information
Solution Approach 1:
The patent uses LCID (Logical Channel Identifier) values as visual indicators or 'colors' to distinguish different types of PHR information. By assigning specific LCID values to indicate presence or absence of power headroom information for serving and non-serving cells, the patent enables the network to easily identify and parse relevant information without increasing structural complexity.
Data Source
AI summary
The present invention relates to a method of transmitting a Power Headroom Report (PHR) related to a non-serving cell in a wireless communication system. In particular, the method includes the steps of: based on a PHR triggering condition being met, determining power headroom information of the plurality of cells; generating a PHR medium access control (MAC) control element (CE) including the power headroom information; and transmitting the PHR MAC CE to a network, wherein a first cell of the plurality of cells is associated with a second cell of the plurality of cells, wherein, based on there being no transmission through the first cell when the power headroom information for the first cell is determined, the PHR MAC CE includes power headroom information for the second cell and further includes a first logical channel identifier (LCID) indicating that the PHR MAC CE includes only the power headroom information for the second cell.