OFDMA Control Channel Interlacing for Handoff Energy Optimization
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Solution Overview
Problem
In Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication systems, the need to support multiple communication links for handoff operations increases energy consumption due to the requirement of additional control channels, which can degrade data channel performance, especially in link-limited conditions.
Innovation Solution
The implementation of control channel interlacing, where control messages are transmitted over multiple control channels using orthogonal or non-orthogonal resources such as time, frequency, or code, allowing for efficient power allocation by prioritizing data channel transmission and minimizing the impact of additional control channels on data channel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple control channels are allocated for handoff operations, then handoff capability is improved, but energy consumption increases and data channel performance degrades
Solution Approach 1:
The patent segments control channel communications into multiple interlaces that are transmitted at different times and/or frequencies. By dividing the control channel into separate interlaces, the system can transmit handoff control information without continuously occupying power resources, thereby reducing overall energy consumption while maintaining handoff capability.
Solution Approach 2:
The patent implements periodic transmission of control channel interlaces rather than continuous transmission. Control information is transmitted in periodic intervals across multiple interlaces, which reduces the total energy consumption compared to continuous control channel usage while still enabling timely handoff operations.
2Adaptability or versatility
If multiple control channels are allocated for handoff operations, then handoff capability is improved, but data channel power availability decreases
Solution Approach 1:
By segmenting control channel communications into separate interlaces transmitted at different times and/or frequencies, the patent allows the data channel to have dedicated power availability during its transmission intervals. The control channels do not continuously compete for power resources, thereby maintaining adequate power availability for data channel transmission while still supporting handoff operations.
Solution Approach 2:
The periodic transmission of control interlaces creates time and frequency intervals where the data channel can transmit with guaranteed power availability. This periodic structure ensures that control channel overhead does not continuously consume power resources that would otherwise be available for data transmission.
3Reliability
If control channels are transmitted continuously, then communication reliability is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent segments continuous control channel transmission into discrete interlaces transmitted at specific times and/or frequencies. This segmentation maintains communication reliability by ensuring control information is transmitted periodically and reliably, while improving energy efficiency by avoiding continuous transmission and allowing power savings during non-transmission intervals.
Solution Approach 2:
The patent employs periodic transmission of control interlaces rather than continuous transmission. This periodic action maintains communication reliability through regular, scheduled transmissions of control information, while significantly improving energy efficiency by eliminating continuous power consumption and allowing energy savings during the intervals between periodic transmissions.
Data Source
AI summary
Apparatus and methods for interlacing communications in random access control channels of an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system are described. A wireless communication device communicating over distinct OFDMA control channels to multiple serving sectors may operate under link limited conditions. The wireless communication device can interlace the communications between the multiple serving sectors. The wireless communication device can interlace the control channel communications in a number of interlaces equal to the number of distinct control channels over which communications are scheduled. In another embodiment, the wireless communication device divide the multiple scheduled control channel communications into two or more sets and can interlace the sets. In another embodiment, the wireless communication device can reserve a first interlace for control channel communications with the serving sector and can time multiplex the remaining control channel communications on a second interlace.