Buffer Status Report Control for LTE Coexistence Gaps
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Solution Overview
Problem
Conventional LTE systems face coexistence issues due to interference between LTE uplink signals and other radio technologies like Bluetooth and WLAN, leading to unacceptable error rates and disruption in voice services, as the eNB is not adequately aware of uplink interference, resulting in unresolved coexistence problems that degrade performance and efficiency.
Innovation Solution
A method is introduced where the UE declares a Radio Link Failure and autonomously switches to a new channel or radio access technology, creating transmission gaps by modifying the transmit buffer status value to reduce uplink grants, allowing other technologies to operate during these gaps, and communicating this issue to the eNB to raise awareness of coexistence problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE uplink transmission is continuous, then data throughput is maximized, but interference to Bluetooth and WLAN increases causing unacceptable error rates
Solution Approach 1:
The patent implements periodic transmission gaps in LTE uplink communication to allow Bluetooth and WLAN operations. The UE modifies buffer status reports to create scheduled gaps where LTE transmission pauses, enabling other radio technologies to operate without interference. This periodic action pattern resolves the contradiction by allowing continuous LTE operation during gaps while preventing interference during active periods.
Solution Approach 2:
The patent applies preliminary action by having the UE proactively modify buffer status reports before actual transmission occurs. By adjusting the buffer status value in advance, the UE signals to the eNB that transmission gaps are needed, allowing the network to schedule appropriate gaps before interference issues arise. This preliminary modification enables coordinated operation among multiple radios.
2Device complexity
If the eNB is not informed of uplink interference, then LTE operation is simplified, but coexistence issues remain unresolved degrading performance
Solution Approach 1:
The patent implements feedback by having the UE include coexistence information in buffer status reports sent to the eNB. This feedback mechanism informs the network about uplink interference conditions without requiring separate signaling protocols. The eNB receives modified buffer status reports that indicate when transmission gaps are needed, enabling the network to adjust scheduling decisions while maintaining simplified operation. This feedback resolves the contradiction by maintaining operational simplicity while improving coexistence reliability.
Data Source
AI summary
A method for wireless communication modifies an actual buffer status report value to create a modified buffer status report that is reported to a base station. The modified buffer status report value results in the base station sending fewer uplink grants to a user equipment. The fewer grants result in transmission gaps in a first radio access technology of the user equipment. The user equipment may use those transmission gaps in the first radio access technology to communicate using a second radio access technology.