Subscriber Location Update Scheduling via Data Revert Channel
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel access and increased infrastructure costs due to the need for frequent location updates from multiple subscribers, leading to collisions and high bandwidth usage, especially when tracking a large number of devices.
Innovation Solution
A method and system that utilize a secondary, non-contention based data revert channel for scheduling and transmitting location updates, assigning specific communication windows to each subscriber, reducing channel access time and infrastructure requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If location updates are transmitted on a separate random access channel, then location tracking capability is improved, but channel throughput is limited by collision probability and access procedures
Solution Approach 1:
The patent segments the location update process into two distinct phases: a contention-based random access phase for initial channel acquisition, and a scheduled phase for actual location update transmissions. This segmentation allows the system to separate the collision-prone access procedure from the data transmission phase, thereby improving overall channel throughput while maintaining location tracking capability.
Solution Approach 2:
The base station performs preliminary actions by pre-allocating dedicated uplink timeslots for location updates and maintaining an active buffer for each subscriber. This preliminary setup eliminates the need for repeated random access procedures during actual location updates, significantly reducing collision probability and improving channel throughput for location tracking.
2Productivity
If multiple subscribers use the same working channel, then channel utilization is improved, but collision probability increases causing message retransmissions
Solution Approach 1:
The patent segments the uplink channel into dedicated location update timeslots separated from general data traffic. This segmentation allows multiple subscribers to share the working channel for data communication while guaranteeing collision-free transmission opportunities for location updates, thereby maintaining both high channel utilization and reliable message transmission.
Solution Approach 2:
The base station acts as an intermediary by maintaining active buffers for each subscriber and proactively allocating uplink timeslots. This intermediary role allows the system to coordinate multiple subscribers' transmissions, preventing collisions while maintaining high channel utilization through efficient resource management.
3Measurement precision
If location updates are transmitted frequently, then location accuracy is improved, but bandwidth usage on the channel increases
Solution Approach 1:
The patent implements periodic location updates using dedicated uplink timeslots that are allocated in advance. This periodic structure allows the system to maintain high location accuracy through frequent updates while efficiently managing bandwidth usage by eliminating repeated random access procedures and confirmation messages, as the base station proactively buffers and processes each update.
4Reliability
If channel access procedures are extended to reduce collisions, then transmission reliability is improved, but channel access time increases
Solution Approach 1:
The base station performs preliminary actions by pre-allocating dedicated uplink timeslots for location updates and maintaining active buffers for each subscriber before transmission is needed. This preliminary setup ensures transmission reliability by guaranteeing collision-free access while minimizing channel access time, as subscribers can directly transmit to their pre-allocated timeslots without extended monitoring or contention procedures.
Data Source
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AI summary
Methods of communicating location information from a subscriber to a repeater are described. The subscriber switches from a working channel to a data revert channel, transmits a request for a periodic or one-time window to transmit an update, and determines from grant information in the response announcement the allocated window and frame before switching back to the working channel. Before the allocated time, the subscriber switches to the data revert channel, confirms whether it remains scheduled to transmit the update from a repeater announcement, and if so transmits the location update in either the current or reserved window. The announcements from the repeater contain the identity of the next window and frame and the subscriber reserved to use the window in addition to grant information. The subscribers may or may not be time-aligned and the data and data revert channels may or may not be synchronized.