Random Access Preamble Repetitions Power Ramping
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Solution Overview
Problem
Wireless devices face inefficiencies in initiating wireless communication with base stations due to the need for repeated preamble transmissions, which can unnecessarily increase transmission power without optimal power management.
Innovation Solution
Implementing transmission power ramping based on the quantity of preamble repetitions and the association with different reference signals, allowing for tailored power adjustments for each random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased for each preamble retransmission, then the reliability of random access procedure is improved, but the energy consumption increases unnecessarily
Solution Approach 1:
The patent implements dynamic transmission power adjustment where the wireless device determines transmission power based on the quantity of preamble repetitions already performed and the specific random access procedure being executed. This allows the power level to adapt dynamically to the actual communication needs rather than following a fixed ramping pattern, resolving the contradiction by making power increases conditional and targeted rather than automatic and universal.
Solution Approach 2:
The patent changes the parameters used for power determination from simple retransmission count to a combination of repetition quantity and random access procedure identification. By introducing procedure-specific parameters, the system can differentiate between various random access scenarios and adjust power accordingly, improving reliability only when necessary while avoiding unnecessary energy consumption in scenarios where lower power suffices.
2Reliability
If transmission power ramping is applied uniformly across all random access procedures, then coverage enhancement is achieved, but power efficiency deteriorates
Solution Approach 1:
The patent applies local quality by associating different transmission power configurations with different random access procedures. Each random access procedure can have its own optimized power strategy based on its specific requirements, rather than applying a uniform ramping pattern to all procedures. This allows coverage enhancement to be applied locally only where needed while maintaining power efficiency elsewhere.
Solution Approach 2:
The patent segments the random access procedures into distinct categories, each with its own power determination rules. By dividing the unified random access process into procedure-specific segments, the system can optimize power usage for each segment independently, achieving coverage enhancement for challenging scenarios without wasting energy in scenarios that require less power.
3Reliability
If multiple random access procedures are performed with increasing power, then connection reliability is improved, but unnecessary power increases occur
Solution Approach 1:
The patent incorporates feedback mechanisms where the wireless device monitors the outcome of each random access procedure and uses this information to determine subsequent transmission power levels. Rather than blindly increasing power for each retransmission, the system uses feedback from previous attempts to make informed decisions about whether power increases are necessary, thus improving connection reliability only when the feedback indicates failure rather than successful connection.
Data Source
AI summary
A wireless device may initiate communications with a base station using one or more random access procedures. Different random access procedures may be associated with a different quantity of preamble repetitions and/or different reference signals. Based on a determination that a random access response has not been received in response to a first quantity of preamble repetitions, the wireless device may perform a second quantity of preamble repetitions using a transmission power that is increased based on at least one of: the first quantity of preamble repetitions and the second quantity of preamble repetitions being the same, or a first reference signal (e.g., associated with the first quantity of preamble repetitions) being the same as a second reference signal (e.g., associated with the second quantity of preamble repetitions).