Uplink Prioritization for Voice Data Under Limited Conditions
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Solution Overview
Problem
Wireless communication systems face challenges in providing reliable voice and non-voice data services under uplink limited conditions, where packet-switched voice data communications are compromised due to poor RF conditions and shared communication links, leading to reduced throughput and potential prioritization issues between delay-sensitive and delay-tolerant data.
Innovation Solution
Implementing transmission time interval (TTI) bundling and prioritization rules to manage uplink communications, such as limiting non-voice data transmissions during voice call silence periods and blanking uplink transmissions of delay-tolerant data over delay-sensitive data, to ensure robust communication characteristics and maintain voice data quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is enabled to compensate for limited transmit power and degraded channel conditions, then uplink communication robustness is improved, but uplink transmission resources are consumed leaving little flexibility for HARQ retransmissions and other data types
Solution Approach 1:
The system dynamically adjusts uplink transmission parameters based on channel conditions and data type priorities. When voice data requires TTI bundling for reliability, the system adaptively reduces or suspends non-voice data transmissions to preserve uplink resources for critical voice communications, thereby maintaining both reliability for voice and flexibility for overall uplink usage.
Solution Approach 2:
The invention changes transmission parameters (such as suspending non-voice data transmissions) based on detected uplink limited conditions. When TTI bundling is detected for voice data, the system modifies the transmission schedule to prioritize voice data, changing the parameter of non-voice data transmission from normal operation to suspended operation, thus resolving the resource conflict.
2Reliability
If RLC segmentation is applied to fit packets into small uplink grants under poor link quality, then packet transmission feasibility is improved, but transmission overhead increases and flexibility for HARQ retransmissions decreases
Solution Approach 1:
The system segments voice data packets into multiple RLC sub-packages that can be transmitted within available uplink grants. This segmentation allows voice data to be transmitted even under poor link conditions with small uplink grants, while the system manages the segmentation overhead by prioritizing voice data transmission over non-voice data.
Solution Approach 2:
The system performs preliminary actions by suspending non-voice data transmissions before they would consume uplink resources. This preventive measure ensures that uplink grants remain available for voice data transmissions and their necessary HARQ retransmissions, avoiding the time loss that would occur if resources were contested.
3Reliability
If uplink transmissions are prioritized for voice data under uplink limited conditions, then voice data quality is maintained, but non-voice data transmission opportunities are reduced
Solution Approach 1:
The system applies different transmission qualities to different data types based on their priority requirements. Voice data receives enhanced quality through TTI bundling and resource prioritization, while non-voice data transmissions are reduced or suspended. This local quality differentiation ensures voice data quality is maintained while managing overall uplink productivity.
Solution Approach 2:
The system takes partial action by selectively suspending only non-voice data transmissions rather than all uplink transmissions. This partial suspension maintains sufficient uplink resources for voice data and its retransmissions while allowing the system to recover productivity by resuming non-voice data transmissions when uplink conditions improve or voice activity decreases.
Data Source
AI summary
This disclosure relates to techniques for handling voice and data under uplink limited conditions in a wireless communication system. A wireless device and a base station may establish a wireless communication link. Transmission time interval bundling (TTI-B) may be enabled for uplink communications between the wireless device and the base station. It may be determined that the wireless device is experiencing uplink limited conditions. One or more rules prioritizing a first type of data over a second type of data for uplink communications may be enabled based on TTI-B being enabled and the wireless device experiencing uplink limited conditions.