Power Headroom Report Transmission for Supplement Uplink Carriers
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Solution Overview
Problem
In existing communication technologies, user equipment only uploads power headroom reports (PHR) for the current working carrier, leading to a situation where the base station may not receive PHR for non-SUL carriers for extended periods, preventing timely power adjustments for both supplement uplink (SUL) and non-SUL carriers.
Innovation Solution
A method and apparatus that determine if a trigger event exists for a serving cell configured with both SUL and non-SUL carriers, transmitting PHR for the current working carrier and ensuring PHR for the secondary carrier is uploaded when it becomes the new working carrier, allowing the base station to adjust power for both carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If user equipment uploads PHR only for the current working carrier when triggered, then the transmission process is simple, but the base station cannot receive PHR for non-SUL carriers timely
Solution Approach 1:
The patent applies preliminary action by proactively transmitting the PHR of the non-SUL carrier before it becomes the working carrier. When the SUL carrier is triggered to transmit PHR, the device simultaneously transmits both the SUL carrier's PHR and the non-SUL carrier's PHR in advance. This ensures the base station receives both PHR values without waiting for carrier switching, thereby resolving the time delay issue while maintaining operational simplicity.
2Device complexity
If user equipment transmits PHR only for current working carrier, then the reporting mechanism is straightforward, but power adjustment for both carriers cannot be achieved
Solution Approach 1:
The patent applies merging by combining the PHR transmission of the SUL carrier and the non-SUL carrier into a single reporting action. When the SUL carrier triggers a PHR transmission, the device merges both PHR values (SUL and non-SUL) into one uplink transmission to the base station. This unified approach ensures both carriers' power information is available simultaneously, enabling reliable power adjustment for both carriers without significantly increasing reporting mechanism complexity.
3Productivity
If PHR is uploaded only once when triggered, then the transmission frequency is low, but the base station may not receive complete carrier information
Solution Approach 1:
The patent applies preliminary action by transmitting the non-SUL carrier's PHR in advance when the SUL carrier is triggered, rather than waiting for the non-SUL carrier to become the working carrier. This proactive transmission ensures complete carrier information is delivered in a single PHR triggering event, preventing information loss while maintaining transmission efficiency by leveraging the existing trigger mechanism.
Data Source
AI summary
A power headroom report transmission method includes: determining whether a trigger event for a first serving cell of user equipment exists; transmitting a power headroom report of a first carrier, as a working carrier, of a first serving cell to a base station in case that there is a trigger event; determining whether a power headroom report of a second carrier of the first serving cell has been uploaded, wherein one of the first carrier and the second carrier is the supplement uplink carrier, and the other of the first carrier and the second carrier is a non-supplement uplink carrier; and in case that the power headroom report of the second carrier is not uploaded, transmitting the power headroom report of the second carrier to the base station when the first serving cell switches to the second carrier as the working carrier.