Power Control Message Indexing in OFDMA Systems
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Solution Overview
Problem
In wireless OFDMA systems, efficiently indexing power control messages within the PC-A-MAP for multiple mobile stations is challenging, leading to potential outdated commands and unnecessary resource usage due to the lack of a clear addressing mechanism.
Innovation Solution
A method where the serving base station configures uplink fast feedback channels with a predefined fixed delay time between the FFBCH and the corresponding PC-A-MAP-IE, allowing mobile stations to identify their power control commands without additional signaling overhead, ensuring timely and accurate power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power control commands for multiple mobile stations are aggregated within the same PC-A-MAP, then resource efficiency is improved, but the complexity of identifying individual commands deteriorates
Solution Approach 1:
The patent segments the aggregated power control messages by inserting unique index fields within the PC-A-MAP structure. Each mobile station's power control command is divided into identifiable segments with specific index values that allow stations to locate their commands without additional signaling overhead, thus maintaining resource efficiency while reducing identification complexity
Solution Approach 2:
The patent introduces an intermediary indexing mechanism embedded within the PC-A-MAP structure. This intermediary index field acts as a mediator between the aggregated power control commands and mobile stations, enabling efficient command identification through the predefined fixed delay time relationship between FFBCH and PC-A-MAP-IE without requiring extra signaling resources
2Measurement precision
If additional signaling overhead is used to address power control commands, then command identification accuracy is improved, but signaling resource consumption deteriorates
Solution Approach 1:
The patent merges the indexing function with the existing PC-A-MAP structure by embedding index fields directly within the power control message format. This combining approach achieves accurate command identification without requiring separate signaling resources, as the index information is integrated into the same messaging infrastructure already used for power control commands
Solution Approach 2:
The patent implements a self-service indexing mechanism where the PC-A-MAP structure itself provides the identification capability through its embedded index fields. The system uses its own existing structure to solve the identification problem without requiring external or additional signaling overhead, making the indexing service self-contained within the current protocol framework
Data Source
AI summary
A method of power control message indexing is provided in a wireless Orthogonal Frequency Division Multiple Access (OFDMA) network. A base station configures fast feedback channels (FFBCHs) and mobile stations report downlink channel information via the configured FFBCHs. Based on the received channel information, the base station estimates uplink channel quality and detects any channel variation. In response to uplink channel variation, the base station delivers power offsets to adjust the transmit power levels of the mobile stations. In one advantageous aspect, the power control commands for mobile stations are aggregated and the indexing scheme of the power control commands is implicitly based on the configured FFBCHs. For example, if a FFBCH is located at a first location in an uplink frame, then a following power control command in response to the FFBCH is located at a second location in a downlink frame, the second location is located after the first location with a predefined fixed delay time.