Switched Multibeam Antenna Scheduling for Wireless Capacity
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Solution Overview
Problem
Existing wireless communication systems face limitations in maximizing system capacity, as switched beam antenna systems only partially address the issue of increasing user throughput and interference reduction.
Innovation Solution
A communication system that schedules a different mobile station in each of multiple predetermined, fixed beams within a sector, allowing concurrent transmission of user information, voice channels, data channels, and control channels to optimize performance and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a switched beam antenna system is used to focus signals on target mobile stations, then interference with non-targeted users is reduced and system capacity is improved, but the system capacity is still limited and cannot be maximized
Solution Approach 1:
The sector is divided into multiple predetermined fixed beams, with each beam serving a specific spatial direction. The system segments the coverage area into discrete beam regions, allowing independent signal transmission to mobile stations in different beams. This segmentation enables multiple users to be served simultaneously in different spatial directions, thereby increasing system capacity while maintaining focused signal transmission and reducing interference.
2Object-generated harmful factors
If transmit power is reduced to minimize interference observed by other mobile stations, then interference is reduced, but system capacity improvement is limited
Solution Approach 1:
The system applies different transmit power levels to different beams based on local requirements. Each beam can have its own power allocation optimized for the specific mobile station(s) served by that beam. This local quality approach allows the system to reduce interference in directions where mobile stations are not present while maintaining high power transmission in directions where mobile stations are located, thereby increasing overall system capacity without unnecessarily reducing power everywhere.
3Power
If all transmit power is allocated to a single beam at a time in a switched beam system, then signal strength to the target mobile station is maximized, but the number of users that can be served simultaneously is limited
Solution Approach 1:
The system merges the capability of switched beam antenna systems with code division multiple access (CDMA) technology. Multiple mobile stations in different beams can simultaneously receive full power signals by using different orthogonal codes. This merging allows the system to maintain high transmit power for each beam while serving multiple users concurrently, thereby increasing the number of users that can be served simultaneously without compromising signal strength.
Data Source
AI summary
In order to increase a capacity, or a number of mobile stations (MSs), or users, that may engaged in concurrent communication sessions, a communication system is provided that schedules a different MS, or user, in each beam of multiple predetermined, fixed beams associated with a coverage area, in particular a sector. By simultaneously scheduling a user in each beam of the multiple beams, a performance and throughput of communication system is significantly increased over the prior art. In one embodiment of the present invention, a portion of a shared communication channel that is allocated to each MS is concurrently transmitted to each MS via a beam associated with the MS. In other embodiments of the present invention, voice channels, data channels, and control channels associated with each MS scheduled in a beam may be concurrently transmitted to each MS via the beam associated with the MS.