PRACH Power Control After Additional RACH Occasion Activation
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing power control for physical random access channel (PRACH) transmissions, particularly when additional random access channel occasions (ROs) are activated, leading to increased interference and energy inefficiency.
Innovation Solution
Implementing a method where user equipment (UE) and network entities adjust power control parameters based on the availability of additional ROs, using different transmission powers to reduce interference and optimize energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If additional ROs are activated to increase random access capacity, then the quantity of substance (number of ROs) is improved, but interference increases and energy efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different power control parameters to different ROs. Specifically, additional ROs are configured with a second power control parameter that enables UEs to use lower transmission power compared to the first power control parameter used for initial ROs. This localized differentiation in power control settings allows the system to increase the number of available ROs while controlling interference through reduced transmission power in the additional ROs.
2Quantity of substance
If additional ROs are activated to increase random access capacity, then the quantity of substance (number of ROs) is improved, but use of energy deteriorates
Solution Approach 1:
The patent implements parameter changes by introducing a second power control parameter for additional ROs that is distinct from the first power control parameter. This parameter change enables UEs to adjust their transmission power dynamically based on which RO they are using. The second power control parameter is configured to allow lower transmission power, thereby reducing energy consumption while maintaining the increased capacity provided by the additional ROs.
3Reliability
If UEs use consistent transmission power across all ROs, then reliability is maintained, but energy efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the transmission power adaptive rather than static. UEs dynamically adjust their transmission power based on the specific RO they are accessing and the corresponding power control parameter configured for that RO. This dynamic power adjustment maintains reliability by ensuring sufficient power for successful access while improving energy efficiency by reducing power consumption in scenarios where lower power is adequate.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may schedule a first set of random access channel (RACH) occasions (ROs). The network entity may activate one or more additional ROs in addition to the first set of ROs. The one or more additional ROs may be available to some user equipments (UEs) such as network energy savings (NES)-capable UEs and unavailable to other UEs such as non-NES-capable UEs. A UE to which the one or more additional ROs are available may use a different power control parameter for transmission of a physical random access channel in an RO of the original set of ROs after activation of the one or more additional ROs as compared to prior to activation of the one or more additional ROs. The different power control parameter may be a different maximum transmission power level or an offset to the transmission power.