Wireless Device Missed Rank Report Handling
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Solution Overview
Problem
Single radio wireless communication devices struggle to receive signals from a second network while connected to a first network, leading to missed rank reports during tune-away periods, which negatively impact resource scheduling and user experience.
Innovation Solution
A wireless communication device generates CSI reports using a previously defined Rank Indicator (RI) value after returning from a tune-away period, allowing the network to interpret these reports and perform scheduling without waiting for the next scheduled rank report, thereby improving network responsiveness and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single radio wireless communication device tunes away from the first network to receive signals from the second network, then the device can receive paging messages for circuit switched services, but the device misses scheduled rank reports during the tune-away period
Solution Approach 1:
The device performs preliminary actions by storing channel state information (CSI) and rank indicator (RI) values before the tune-away period begins. When returning to the first network, the device retrieves these pre-stored values to generate CSI reports, eliminating the need to wait for the next scheduled rank report and thus preventing information loss.
Solution Approach 2:
The patent introduces an intermediary mechanism where the device maintains a buffer of previously measured and processed channel state information. This intermediary storage allows the device to bridge the gap during tune-away periods, providing continuous CSI reporting to the network without actual real-time measurements during the absence.
2Reliability
If the network waits for the next scheduled rank report after a tune-away period, then the network ensures accurate resource scheduling, but the network responsiveness and throughput are reduced
Solution Approach 1:
The device provides feedback to the network by transmitting CSI reports generated from pre-stored measurements immediately upon return from tune-away. This feedback mechanism allows the network to maintain accurate resource scheduling decisions without waiting for the next scheduled rank report, thus preserving both reliability and productivity.
Solution Approach 2:
By performing channel measurements and storing CSI/RI values before the tune-away period, the device prepares advance feedback information that the network can immediately utilize upon the device's return, eliminating scheduling delays while maintaining accuracy.
3Device complexity
If a single radio device uses a single radio to support multiple RATs, then the device reduces hardware complexity and cost, but the device cannot simultaneously connect to multiple networks
Solution Approach 1:
The single radio device employs periodic action by alternately tuning to different networks at scheduled intervals. During non-tune-away periods, the device connects to the first network for data transmission, while during designated tune-away periods, it tunes to the second network to monitor paging messages, thus achieving multi-network support with a single radio.
Solution Approach 2:
The single radio is designed with multi-functionality to support operation on multiple Radio Access Technologies (RATs). The radio can be reconfigured to operate on different frequency bands and protocols, allowing it to serve both LTE and legacy networks sequentially, providing universal connectivity without requiring separate dedicated radios.
Data Source
AI summary
A method for handling a missed rank report during a tune-away period is provided. The method can include a wireless communication device tuning away from a first network to a second network for a tune-away period; returning to the first network from the tune-away period; determining that a scheduled rank report was missed during the tune-away period; generating a Channel State Indicator (CSI) report based on a previously defined Rank Indicator (RI) value known to the first network in response to missing the scheduled rank report; and sending the CSI report to the first network.