CQICH Allocation Indexing for Wireless Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems, such as IEEE 802.16e, face significant overhead due to the large amount of information required for Channel Quality Information (CQICH) resource allocation, necessitating substantial downlink broadcast channel resources to inform every user of CQICH allocation information.
Innovation Solution
The method involves determining CQICH patterns required for users and selecting a CQICH pattern block, allocating CQICH sub-blocks based on pre-generated resource layout information, and transmitting CQICH allocation information using a single index, thereby reducing the amount of information needed for CQICH allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fields of messages are used to inform each user of CQICH resource allocation information, then every user can receive complete allocation information, but the amount of downlink broadcast channel resources required increases significantly
Solution Approach 1:
The patent segments CQICH allocation information into two parts: CQICH pattern information (transmitted once to all users) and CQICH resource allocation information (transmitted individually to each user). This segmentation allows the system to reduce overall broadcast overhead while ensuring complete information delivery to each user.
Solution Approach 2:
The patent performs preliminary action by pre-defining CQICH patterns and transmitting them to all users before actual CQICH resource allocation. Users store these patterns in advance, so when allocation occurs, only minimal index information needs to be broadcast, significantly reducing downlink resources required at allocation time.
2Loss of information
If comprehensive CQICH allocation information is transmitted to every user at every allocation period, then users have complete resource allocation details, but the overhead caused by CQICH allocation increases
Solution Approach 1:
The patent extracts CQICH pattern information from the regular allocation messaging and transmits it separately as a preliminary message. This extraction allows the main allocation messages to contain only essential index references, reducing overhead while maintaining information completeness.
Solution Approach 2:
By transmitting CQICH pattern information in advance and having users store it locally, the system eliminates the need to retransmit this information at every allocation period, significantly reducing periodic overhead while maintaining complete information availability.
3Quantity of substance
If a single index is used to transmit CQICH allocation information, then the amount of information required for transmission is reduced, but the system must pre-pattern CQICH resources for different operation modes
Solution Approach 1:
The patent performs preliminary action by pre-defining multiple CQICH patterns corresponding to different operation modes and storing them in a pattern table. This pre-processing, while adding initial complexity, enables the use of compact single-index references during actual allocation, significantly reducing transmission information requirements.
Solution Approach 2:
The patent introduces a new dimension of CQICH pattern indexing, where instead of directly allocating resources, the system allocates pattern indices that reference pre-defined resource structures. This dimensional change from direct resource allocation to pattern-based allocation reduces the information needed for transmission.
Data Source
AI summary
Apparatus and method for allocating a Channel Quality Information CHannel (CQICH) in a wireless communication system are provided. The method includes determining CQICH patterns required for users using information of one or more users to which CQICH resources are to be allocated, and selecting a CQICH pattern block, including all of the determined CQICH patterns, from among a plurality of pre-generated CQICH pattern blocks; and allocating CQICH sub-blocks corresponding to the users' required CQICH patterns using resource layout information of the CQICH sub-blocks corresponding to the CQICH patterns of the selected CQICH pattern block, and transmitting CQICH allocation information to a Mobile Station (MS).