Multicast Service Resource Allocation in Wireless Systems
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Solution Overview
Problem
Current wireless telecommunications systems, particularly in 3G UMTS, face inefficiencies in providing multicast services due to the use of HS-DSCH, which treats all users equally, leading to bottlenecks and excessive resource consumption, especially when supporting large user groups, as they conservatively select coding and modulation parameters based on the worst user's channel quality, resulting in limited multicast service capabilities and high resource utilization.
Innovation Solution
A method is introduced to efficiently manage multicast services by identifying and partitioning users into different service groups based on their channel quality and error rates, using HSDPA to dynamically adjust data rates and retransmissions, and modifying MAC packet formats to optimize resource allocation and reduce unnecessary retransmissions, allowing for better resource utilization and higher bit rates without requiring new handsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HS-DSCH is used for multicast services with conservative coding and modulation selection to satisfy the worst case user, then reliability for all users is improved, but system capacity and productivity are limited
Solution Approach 1:
The patent segments users into different groups based on their channel quality and error rates. Users are divided into a first group with lower error rates and a second group with higher error rates, allowing different coding and modulation parameters to be applied to each group. This segmentation resolves the contradiction by enabling higher productivity for users with good channel conditions while maintaining reliability for users with poor channel conditions through group-specific parameter selection.
Solution Approach 2:
The patent applies local quality by tailoring coding and modulation parameters to specific user groups based on their individual channel conditions. Instead of using uniform conservative parameters for all users, the system selects appropriate parameters locally for each group, optimizing the balance between reliability and productivity for different user scenarios.
2Adaptability or versatility
If HS-DSCH uses adaptive coding and modulation with feedback from the worst user, then individual service provision is improved, but multicast service provision and cell resource management are compromised
Solution Approach 1:
The patent segments users into multiple groups based on their error rates and channel conditions. This segmentation allows the system to provide adapted service to each group while managing cell resources more efficiently. By having distinct groups with different parameter requirements, the system can optimize multicast service provision without being constrained by the worst user in the entire cell.
Solution Approach 2:
The patent implements dynamic parameter selection where coding and modulation parameters are adapted based on the characteristics of each user group. The system dynamically adjusts parameters for different groups rather than using static conservative parameters for all users, improving both individual service provision and overall multicast capability.
3Reliability
If FACH is used for multicast services to cover edge users, then coverage is improved, but bit rate and power efficiency deteriorate
Solution Approach 1:
The patent segments users into groups based on their channel conditions and requirements. Users with poor channel conditions (edge users) are placed in groups that receive parameters optimized for coverage, while users with better channel conditions are placed in groups receiving parameters optimized for higher bit rates. This segmentation allows the system to maintain both coverage and speed efficiency simultaneously.
Solution Approach 2:
The patent applies local quality by selecting appropriate transmission parameters for different user groups based on their specific channel conditions. Edge users receive parameters optimized for coverage and reliability, while inner-cell users receive parameters optimized for higher data rates, achieving both coverage and speed efficiency through localized parameter optimization.
4Speed
If DCH is used for multicast services to provide high data rates, then speed is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent segments users into groups and applies different transmission techniques to different groups. Not all users are served using the more complex DCH technique; instead, users are divided into groups that can be served using simpler FACH-based approaches when appropriate. This segmentation reduces overall device complexity and resource consumption while maintaining high data rates for users who require them.
Solution Approach 2:
The patent applies partial action by using DCH only for the subset of users who require high data rates and have the necessary channel conditions, rather than applying it universally to all users. This selective application reduces the overall complexity and resource consumption associated with DCH while maintaining high speed performance for the users who need it.
Data Source
AI summary
In one aspect of the present invention, a method is provided for delivering multicast data to a plurality of mobile devices. The method comprises providing data using a first technique, such as multicast over HS-DSCH, to a first portion of the plurality of mobile devices, and providing data using a second technique, such as multicast over DCH or FACH, to a second portion of the plurality of mobile devices. The type of multicast technique used is based upon a quality of communications, such as the long term block error rate, that exists with respect to each of the mobile devices.