Wireless Broadcast Signalling for Power Reduction
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Solution Overview
Problem
In wireless broadcast systems, the increasing use of signal compression techniques and provision of lower data rate services lead to a large number of thinly spread data streams, resulting in significant power consumption due to the need for extensive signalling overhead and high sampling rates, particularly in battery-powered receivers.
Innovation Solution
The method involves mapping multiple data streams onto a super-frame with a preamble section containing fixed and variable-sized signalling information fields, allowing efficient transmission and reception of data streams while optimizing power consumption by reducing the sampling rate and bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signalling information is carried for each data stream in every frame, then reception assistance is provided, but overhead and power consumption increase significantly
Solution Approach 1:
The patent segments signalling information into two distinct fields: a first signalling information field with a predetermined size that is always transmitted, and a second signalling information field with variable size that is selectively transmitted only when needed. This segmentation allows the system to provide necessary reception assistance while avoiding unnecessary overhead and power consumption when the full signalling capacity is not required.
Solution Approach 2:
The patent introduces dynamic adaptability by making the second signalling information field optional and variable in size. The transmitter selectively includes this field based on whether additional signalling information beyond the predetermined amount is required. This dynamic approach allows the system to adapt its signalling overhead to the actual needs of each frame, reducing power consumption when fewer data streams are present while maintaining reliability when more streams require assistance.
2Reliability
If sampling rate is increased to receive whole symbol bandwidth, then data stream reception is enabled, but power consumption increases
Solution Approach 1:
The patent extracts and transmits only the necessary signalling information required for data stream reception rather than providing complete bandwidth information. By taking out only the essential signalling elements needed to identify and decode data streams, the receiver can operate at lower sampling rates while still achieving reliable reception, thereby reducing power consumption without sacrificing reception capability.
3Adaptability or versatility
If number of data streams is increased, then service diversity is improved, but signalling overhead increases
Solution Approach 1:
The patent segments signalling information into a fixed first field and a variable second field, allowing the system to scale signalling overhead appropriately with the number of data streams. The first field provides baseline signalling for a limited number of streams, while the second field is activated only when additional streams require signalling, thus improving service diversity while controlling overhead growth.
Solution Approach 2:
The patent makes the signalling structure dynamic by selectively activating the second signalling information field based on the number of data streams. When few streams are present, only the compact first field is used. When more streams require assistance, the second field is added. This dynamic adaptation allows the system to support diverse services with varying numbers of streams while keeping signalling overhead proportional to actual needs.
Data Source
AI summary
A method and apparatus for transmitting a plurality of data streams in a wireless broadcast system are provided. The method includes mapping the plurality of data streams onto a super-frame that includes a plurality of frames; inserting signalling information in a first signalling information field for assisting in the reception of a first number of said plurality of data streams for a given frame, the first number being less than or equal to a limit applicable to each of the plurality of frames; dependent on a number of data streams for the given frame being greater than the limit, inserting signalling information in a second signalling information field; inserting said first and second signalling information fields in a preamble section of said given frame; and transmitting the plurality of frames.