Broadcast Control Header Resource Allocation for Wireless Networks
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Solution Overview
Problem
In wireless networks, the existing methods for broadcasting control information face challenges in efficiently allocating resources and reducing decoding latency, particularly in communicating system configuration information across superframes, which can lead to delays and inefficiencies.
Innovation Solution
The method involves determining physical resource units (PRUs) and selecting subsets of PRUs to create logical resource units (LRUs) through permutation or direct mapping, with the broadcast control header (BCH) transmitting system configuration information for current and subsequent superframes, allowing mobile stations to decode subframes without waiting for system configuration in the current superframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If system configuration information is transmitted only in the current superframe, then the broadcast control header structure remains simple, but mobile stations experience decoding latency and cannot quickly recover from sleep modes
Solution Approach 1:
The patent applies preliminary action by transmitting system configuration information for future superframes in advance within the current BCH. This allows mobile stations to receive and store configuration data before it is needed, enabling them to decode subsequent superframes immediately upon waking from sleep mode without waiting for the next BCH transmission, thereby reducing decoding latency.
Solution Approach 2:
The patent segments the system configuration information into multiple parts: current superframe configuration and future superframe configurations. Each BCH contains configuration data for the current superframe and one or more future superframes, allowing mobile stations to selectively process only the configuration data they need at each wake-up cycle, reducing processing overhead.
2Reliability
If PRUs are mapped directly to LRUs without permutation, then resource allocation is simple, but frequency diversity and robustness against fading are reduced
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple permutation patterns for mapping PRUs to LRUs. These patterns are established in advance and selected based on channel conditions, allowing the system to achieve frequency diversity without complex real-time calculations. The permutation patterns spread subcarriers across different frequency resources to exploit frequency diversity.
Solution Approach 2:
The patent changes the mapping parameter from direct mapping to permuted mapping, where the permutation pattern index becomes an additional controllable parameter. By adjusting the permutation pattern selected, the system can adapt to different channel conditions and achieve optimal frequency diversity while maintaining manageable complexity through a finite set of predefined patterns.
Data Source
AI summary
Various example embodiments are disclosed herein related to broadcast control headers for wireless networks. According to an example embodiment, a method may include allocating resources for a broadcast channel for a wireless network may include determining a set of physical resource units (PRUs), each PRU including a plurality of contiguous subcarriers, selecting one or more subsets of the PRUs, each subset including a plurality of PRUs distributed across the set of PRUs, and determining a plurality of logical resource units (LRUs) from each subset of PRUs, including permutating the subcarriers independently within each subset of PRUs to obtain the plurality of LRUs for each subset of PRUs, each LRU including a plurality of distributed subcarriers.