Backoff and Crestcomp Parameter Storage for Mobile Transmitters

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Solution Overview

Problem

The large number of transmission configurations in new generation mobile devices, such as those introduced by 3GPP Rel-6, requires a substantial amount of backoff and crestcomp parameters to be stored in memory, making it costly and inefficient to store and access these parameters in fast memory proximate the processor.

Innovation Solution

Storing configuration-specific power amplifier parameters in a permanent memory and transferring selected graphs to a fast memory for quick access, reducing the memory requirements of the fast memory by compressing tables and eliminating null spaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If all backoff and crestcomp parameters for all transmission configurations are stored in fast memory, then quick access to parameters is achieved, but memory size and cost become prohibitively large

Engineering Contradiction:

Improveparameter access speedVSAvoidmemory size

Core Design Contradiction:

SpeedVSQuantity of substance

Solution Approach 1:

The patent divides the parameter storage into two segments: a small fast memory that stores only the currently needed parameters for active transmission configurations, and a larger slow memory that stores parameters for all possible transmission configurations. This segmentation allows the system to maintain fast access speed for active parameters while avoiding the prohibitive cost of storing all parameters in fast memory.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system pre-loads parameters into fast memory for transmission configurations that are likely to be needed based on current system state and configuration. By anticipating which parameters will be needed and loading them in advance, the system maintains fast access performance without requiring all parameters to reside in fast memory simultaneously.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If a large number of backoff and crestcomp parameters are stored in memory, then all transmission configurations are supported, but memory cost increases prohibitively

Engineering Contradiction:

Improvetransmission configuration supportVSAvoidmemory capacity

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent segments parameter storage across two memory types with different characteristics. The slow memory provides comprehensive storage for all possible transmission configurations, ensuring full adaptability and versatility. The fast memory provides quick access to currently active configurations. This segmentation allows the system to support all transmission configurations without requiring prohibitively large fast memory capacity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The processor acts as an intermediary between the slow memory containing all parameters and the fast memory containing active parameters. When a transmission configuration changes, the processor retrieves the new parameters from slow memory and transfers them to fast memory, enabling the system to support all configurations while maintaining efficient access to active ones.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Speed

If fast memory is increased to store all parameters, then parameter access remains quick, but device cost becomes prohibitively expensive

Engineering Contradiction:

Improveparameter retrieval speedVSAvoiddevice manufacturing cost

Core Design Contradiction:

SpeedVSEase of manufacture

Solution Approach 1:

The patent segments the memory system into two parts with different speed and cost characteristics. The slow memory provides inexpensive bulk storage for all parameters, while the small fast memory provides expensive but minimal high-speed storage for active parameters. This segmentation dramatically reduces the total cost compared to using large fast memory, while maintaining quick access performance for currently needed parameters.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically changes the contents of fast memory based on the current transmission configuration. As configurations change, different parameter sets are loaded into fast memory from slow memory. This dynamic parameter change allows the system to maintain fast access speed with a small fast memory, avoiding the need for large expensive fast memory capacity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8687676B2Efficient storing of backoff and crestcomp values

Publication Date: 2014.04.01 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

An efficient way to store backoff and crestcomp parameters while providing quick access to the backoff and crestcomp parameters associated with specific transmission configurations is described herein. A long-term memory stores amplifier parameters for a plurality of different transmission configurations. A selection element selects from the long-term memory a graph of the amplifier parameters corresponding to a selected subset of the transmission configurations. The selected graph relates each of a plurality of enhanced data channel gain ratios to a corresponding amplifier parameter. The selection element transfers the selected graph from the long-term memory to a fast memory proximate a DSP. Further, the selection element reselects and transfers new graphs into the fast memory as needed.