Wireless Handover Using Shared Data Bandwidth Instead of RACH
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in handover processes due to over-utilization of random access channels (RACH) during active communications, which can lead to delays and reduced network performance.
Innovation Solution
Implementing a method that facilitates handover by utilizing shared data portions of bandwidth instead of random access channels, allowing for optimized handover procedures without the need for a separate random access portion, thereby reducing the load on random access channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If random access channel (RACH) is used for handover procedures, then handover can be initiated, but RACH becomes over-utilized causing delays and reduced network performance
Solution Approach 1:
The patent merges the handover initiation function into the existing shared data channel resources. Instead of using a separate RACH for handover requests, the system utilizes the shared data channel's uplink resources to carry handover information, thereby eliminating the need for dedicated random access portions and reducing overall system complexity.
Solution Approach 2:
The shared data channel resources are made multi-functional by enabling them to serve both data transmission and handover initiation purposes. The uplink shared data channel resources can be dynamically allocated to mobile devices for handover procedures, making the channel capable of performing multiple functions simultaneously.
2Ease of operation
If separate random access portion is used for handover, then handover procedures can be optimized, but bandwidth resources are consumed and overloading occurs
Solution Approach 1:
The patent combines the handover procedure with the existing shared data channel resources, eliminating the need for a separate random access portion. The shared data channel's uplink resources are utilized to carry handover information, thereby consolidating multiple functions into a single channel and reducing the total bandwidth required for handover operations.
3Productivity
If RACH is over-utilized during active communications, then handover requests can be processed, but delays increase and network performance deteriorates
Solution Approach 1:
The system performs preliminary allocation of shared data channel resources before handover is actually needed. By pre-configuring the uplink shared data channel resources and maintaining them in a ready state, the system can quickly execute handover procedures without waiting for RACH access, thereby reducing handover delays.
Solution Approach 2:
The shared data channel resources are kept continuously available for both data transmission and handover operations. This continuous availability ensures that handover requests can be processed without interruption or waiting periods, maintaining steady network operation and eliminating the delays associated with RACH contention.
Data Source
AI summary
Systems and methodologies are described that facilitate handing over mobile device communications in a wireless network from a source base station to a target base station without using a random access channel (RACH). In this regard, the source base station can request shared data bandwidth resources from the target base station on behalf of the mobile device and assign the resources to the mobile device. The mobile device can calculate a timing difference between the source and target base stations and can handover communications by transmitting over the shared data bandwidth using the timing difference to generally provide correct timing for the transmission. To this end, the target base station can have transmission time intervals where it allows transmitting with an extended cyclic prefix to ensure more reliable handover for the mobile device.