Late Entry Voice Stream Replay Mechanism
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Solution Overview
Problem
In radio access networks, late entry subscriber devices often miss portions of voice streams during group calls due to reconnection or interference issues, leading to incomplete communication and potential safety risks, as critical information may be missed.
Innovation Solution
A method and apparatus for replaying missed voice stream portions in wireless radio networks, where a subscriber device detects its late entry, requests re-transmission of the missed portion from the base station, and calculates the duration based on received and total call durations to ensure all late entry devices receive the missed content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a subscriber device joins a voice call late due to reconnection or interference, then the device can resume communication, but it misses portions of the voice stream leading to incomplete information
Solution Approach 1:
The base station performs preliminary action by buffering and preserving the missed voice stream portions before the late-entry device joins the call. When the device requests retransmission, the base station can immediately provide the buffered content without needing to re-record or reconstruct it, ensuring complete information delivery.
Solution Approach 2:
The base station creates a copy of the missed voice stream portion and transmits it separately to the late-entry device. This copying mechanism allows the device to receive both the original live stream and the replicated missed portion, ensuring complete information without interfering with ongoing communications.
2Reliability
If the base station re-transmits the entire missed voice stream to one late entry device, then that device receives complete information, but other late entry devices may miss portions still being transmitted
Solution Approach 1:
The system implements feedback mechanisms where late-entry devices report their entry timing and duration to the base station. The base station uses this feedback information to calculate and determine the appropriate retransmission window, ensuring that all affected devices receive the necessary missed portions without excessive redundancy.
Solution Approach 2:
The retransmission mechanism is dynamic rather than static. The base station adjusts the retransmission timing and duration based on real-time information about when devices joined the call and how long they were connected, optimizing the delivery of missed voice stream portions to multiple devices simultaneously.
3Measurement precision
If the system requests re-transmission of missed voice stream portions, then communication accuracy improves, but transmission time and network resources increase
Solution Approach 1:
The base station performs preliminary buffering of voice stream portions before retransmission is requested. This preliminary preparation eliminates the need for time-consuming re-recording or reconstruction of missed content, reducing the overall time penalty for ensuring communication accuracy.
Solution Approach 2:
The system changes the timing parameter of voice stream transmission by delivering missed portions during or after the original call window rather than requiring a separate dedicated retransmission session. This parameter adjustment optimizes the balance between ensuring complete information delivery and minimizing additional time consumption.
Data Source
AI summary
Missed voice stream portions are replayed at a late entry subscriber device (SD) in a wireless radio network. The SD joins a voice call on a radio channel via a base station and detects that it is late to the call. The SD continues to receive a remaining portion of the call and plays back the portion of the call. The SD detects an end of the voice call, and (i) transmits a request message including an indication of a first duration of the portion of the call received or (ii) detects a similar message from another SD. The SD then receives an indication of a total duration of the voice call and calculates a third duration as a function of the total duration and the first duration. The SD receives and plays back the missed portion of the call for the third duration.