HRPD Pilot Group Identification and Message Optimization
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Solution Overview
Problem
The existing high rate packet data (HRPD) system faces challenges in efficiently conveying pilot group information, managing neighbor lists, updating routes across multiple carriers, and optimizing message lengths in multi-carrier mobile communication systems, leading to potential misidentification of pilot groups and increased message complexity.
Innovation Solution
Incorporating PilotGroupID in sector parameter messages, encoding techniques for shortened neighbor list messages, improving RouteUpdateRequest messages to handle multiple carriers, including channel records in RouteUpdate messages, and limiting auxiliary DRC cover usage to clarify serving sectors and reduce message length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilot group information is conveyed in existing HRPD messages, then terminal can identify pilot groups, but message complexity increases and misidentification may occur
Solution Approach 1:
The patent extracts pilot group identification information from existing complex HRPD messages and conveys it through a separate, dedicated field in overhead messages. This isolation allows the identification information to be transmitted clearly without the complexity and potential misidentification issues of the original message structure.
Solution Approach 2:
The patent segments the pilot group identification information into a distinct component that can be independently conveyed to terminals. By separating this critical identification data from other message elements, the system achieves more accurate pilot group identification while reducing overall message complexity.
2Adaptability or versatility
If neighbor lists are transmitted for all carriers, then terminal can access complete neighbor information, but message length increases
Solution Approach 1:
The patent applies partial action by transmitting neighbor lists selectively rather than for all carriers. The system determines which carriers require neighbor list transmission based on current system conditions and terminal needs, thereby reducing message length while maintaining sufficient neighbor information for proper network access.
Solution Approach 2:
The patent implements local quality by providing different levels of neighbor list information for different carriers based on their specific requirements. Rather than uniformly transmitting complete neighbor lists for all carriers, the system tailors the information provided to each carrier's actual needs, reducing overall message length while maintaining adaptability.
3Measurement precision
If auxiliary DRC cover is used for all pilots, then terminal can determine serving sectors accurately, but message complexity and length increase
Solution Approach 1:
The patent applies local quality by selectively providing auxiliary DRC cover information for specific pilots rather than all pilots. The system determines which pilots require auxiliary DRC cover based on local conditions such as signal strength and interference levels, thereby maintaining accurate serving sector determination while reducing message complexity.
Solution Approach 2:
The patent uses partial action by providing auxiliary DRC cover for only the necessary subset of pilots. Rather than universally applying auxiliary DRC cover to all pilots, the system identifies and provides it only where needed for accurate serving sector determination, reducing overall message complexity.
4Measurement precision
If route updates are performed for multiple carriers, then network can track terminal location accurately, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by performing route updates for only the necessary carriers rather than all carriers. The system determines which carriers require route update signaling based on the terminal's current location and network conditions, thereby maintaining accurate terminal location tracking while reducing signaling overhead.
Data Source
AI summary
Mechanisms for improving the proposed high rate packet data (HRPD) system are provided. Approaches proposed are including PilotGroupID in the sector parameter message to convey the pilot group information, encoding to enable shortened NeighborList messages, improvements on RoutUpdateRequest message for request updates on multiple carriers, inclusive of the channel record of the reference pilot in the RouteUpdate message when the message sent in the connected state, using pilot drop timer of a Candidate Set pilot as a trigger for sending RouteUpdate, encoding the TrafficChannelAssignment message to shorten the message in certain situations, limiting the usage of auxiliary DRC cover in some situations to avoid confusion in determining the serving sector and processing OverheadMessages. Updated Indication and OverheadMessagesNeighborList Initialization in the idle state.