MAC CE Design for Dynamic P-MPR Reporting in 5G NR
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G New Radio (NR), face challenges in efficiently managing power headroom reporting and maximum power reduction for multiple power management scenarios, especially at millimeter wave frequencies where beam management is complex and power backoff due to MPE requirements can impact UL coverage.
Innovation Solution
The proposed solution involves optimizing the Medium Access Control (MAC) control element (CE) design to efficiently report multiple power management maximum power reduction (P-MPR) values. This is achieved by using control bits to indicate the presence or absence of P-MPR values and associated candidate beam information, allowing for a variable size MAC CE that only includes necessary fields, thereby reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed-size MAC CE is used to report multiple P-MPR values, then the structure is simple and easy to decode, but the overhead increases when not all P-MPR values need to be reported
Solution Approach 1:
The MAC CE structure is made dynamic by introducing indicator bits that control the presence or absence of optional fields (MPE indicator, SSBRI/CRI, candidate beam information) based on the actual P-MPR values. This allows the MAC CE size to adapt to the reporting needs, reducing overhead when fewer fields are required while maintaining the ability to report complete information when necessary.
Solution Approach 2:
The MAC CE is segmented into mandatory fields and optional fields. The indicator bits act as segment separators that determine whether optional fields are included. This segmentation allows the network to receive only the necessary information for each P-MPR value, reducing overall overhead while maintaining structural organization for easy decoding.
2Reliability
If all candidate beam information is always included in the MAC CE, then complete beam information is available for network decisions, but the MAC CE size and processing complexity increase
Solution Approach 1:
Instead of uniformly including all candidate beam information for all P-MPR values, the patent applies local quality by selectively including beam information only for P-MPR values where it is relevant (indicated by the indicator bits). This ensures that the network receives complete beam information where needed while avoiding unnecessary data transmission and processing where not required.
Solution Approach 2:
The patent implements partial action by including candidate beam information only for a subset of P-MPR values rather than all of them. The indicator bits determine which P-MPR values require beam information, allowing the system to provide sufficient information for reliable beam management while reducing MAC CE size and processing complexity.
3Loss of energy
If the MAC CE includes variable size based on P-MPR values, then overhead is reduced by including only necessary fields, but the decoding complexity at the network node increases
Solution Approach 1:
The indicator bits are placed at the beginning of the optional field sections, performing preliminary action by indicating in advance whether the subsequent fields are present. This allows the network node to decode the MAC CE efficiently by first reading the indicator bits and then conditionally processing only the necessary fields, reducing decoding complexity despite the variable size.
Data Source
AI summary
A method, network node and wireless device (WD) for medium access control (MAC) control element (CE) design for multiple power management maximum power reduction (P-MPR) reporting are disclosed. According to one aspect, a method in a network node includes receiving from the WD a power headroom report (PHR) medium access control (MAC) control element (CE) that includes power headroom information for at least one serving cell and for each of the at least one serving cell, information for a plurality of P-MPR, values and candidate beam information associated to at least one of the plurality of P-MPR values. The method also includes determining, for each of the plurality of P-MPR values, a presence of candidate beam information in the MAC CE based at least in part on a bit content in at least one associated field of the MAC CE.