Mobile Station Control Channel Modulation Order Field
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Solution Overview
Problem
In mobile communication systems, especially CDMA2000 1xEV-DV, the need for multiple mapping tables to manage modulation orders and code rates for packet data transmission increases memory requirements in both base stations and mobile stations, limiting adaptability and increasing power consumption and cost, particularly in mobile stations.
Innovation Solution
The method involves transmitting control information over a packet data control channel with an additional field indicating the modulation order, allowing mobile stations to determine the modulation order used by the base station without relying on separate mapping tables, and enabling the base station to dynamically select modulation orders based on radio channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple mapping tables are used to manage modulation orders and code rates, then the system can support various packet data transmission configurations, but the memory requirements in mobile stations increase
Solution Approach 1:
The patent extracts the modulation order information from the implicit mapping table structure and transmits it explicitly as a separate field in the control information. This allows the mobile station to determine the modulation order directly from the received control information without needing to store multiple mapping tables, thereby reducing memory requirements while maintaining adaptability.
Solution Approach 2:
Instead of storing complete mapping tables that map encoder packet sizes and Walsh code counts to modulation orders and code rates, the system transmits only the necessary modulation order information as a simplified copy of the full mapping relationship. This reduces the amount of data that needs to be stored and processed in the mobile station.
2Adaptability or versatility
If multiple mapping tables are stored in mobile stations, then various transmission configurations can be supported, but power consumption and cost increase
Solution Approach 1:
The patent extracts and transmits only the essential modulation order information needed for packet data transmission, eliminating the need for mobile stations to store and process large mapping tables. This reduction in data storage and processing directly lowers power consumption in mobile devices while preserving the ability to support various transmission configurations.
3Device complexity
If control information is transmitted without explicit modulation order indication, then the control information format remains compact, but mobile stations cannot determine the modulation order used by the base station
Solution Approach 1:
The patent merges the modulation order indication into the existing control information format by adding a modulation order field to the packet data control channel. This integration allows the base station to transmit both the control information and the modulation order indication together in a unified structure, eliminating the need for separate mapping table lookups while maintaining compact control information transmission.
Data Source
AI summary
Disclosed is an apparatus and method for transmitting and receiving control information for a packet data channel in a mobile communication system supporting a high-speed packet data service and a circuit voice service. A base station generates control information indicating an encoder packet size, a code rate and the number of Walsh codes used for transmission of packet data to a mobile station, and transmits the generated control information over a packet data control channel. The mobile station receives the control information over the packet data control channel while receiving the packet data over the packet data channel, and decodes the received packet data according to a modulation order determined based on the received control information.