Multicast Bandwidth Allocation for Reduced Capacity User Equipment
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Solution Overview
Problem
Current wireless communications systems do not effectively support multicast or broadcast operations for enhanced reduced capacity user equipment (eUEs), as they often limit bandwidth, restrict transmission repetitions, and do not accommodate feedback scenarios.
Innovation Solution
The proposed solution involves a method where user equipment (UEs) receive control information scheduling multicast or broadcast transmissions, with indications of transmission bandwidth and acknowledgement requirements. Based on this information, UEs determine the quantity of transmission instances and adjust bandwidth accordingly, allowing for improved handling of reduced capability devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bandwidth of multicast or broadcast transmission is limited for reduced capacity user equipment, then the device complexity is reduced, but the productivity (data transmission capacity) deteriorates
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the network can configure different bandwidths for multicast/broadcast transmissions based on UE capabilities. The gNB can adaptively adjust the bandwidth of PDSCH transmissions carrying multicast traffic, allowing reduced capacity UEs to receive transmissions at lower bandwidths while full-capability UEs can utilize wider bandwidths, thus resolving the contradiction between device complexity and productivity
Solution Approach 2:
The patent changes the bandwidth parameter of multicast/broadcast transmissions based on UE capability indicators. The network receives capability information from UEs and adjusts transmission parameters accordingly, enabling reduced capacity UEs to operate at appropriate bandwidth levels while maintaining the option for higher bandwidth transmissions when needed, effectively balancing device complexity requirements with data transmission capacity needs
2Use of energy by moving object
If transmission repetitions are restricted for reduced capacity user equipment, then the use of energy is reduced, but the reliability of reception deteriorates
Solution Approach 1:
The patent implements dynamic control of transmission repetitions where the gNB can configure whether repetitions are allowed based on UE capability and service requirements. The network can adaptively enable or disable repetition transmissions for reduced capacity UEs, allowing energy-efficient operation when repetitions are disabled while maintaining reception reliability when repetitions are enabled, thus resolving the contradiction between energy consumption and reception reliability
Solution Approach 2:
The patent changes the repetition parameter of transmissions based on UE capability indicators and service requirements. The network receives capability information from UEs and adjusts the repetition configuration accordingly, enabling reduced capacity UEs to operate with appropriate repetition levels - minimizing energy consumption when repetitions are not needed while ensuring reception reliability when channel conditions or service requirements demand it
3Device complexity
If feedback scenarios are not accommodated for reduced capacity user equipment, then the device complexity is reduced, but the reliability of communication deteriorates
Solution Approach 1:
The patent implements dynamic feedback mechanism where the network can configure whether uplink feedback is required for multicast/broadcast transmissions based on UE capability and service requirements. The gNB can adaptively enable or disable feedback transmissions for reduced capacity UEs, allowing simplified operation when feedback is not required while maintaining communication reliability when feedback is enabled, thus resolving the contradiction between device complexity and communication reliability
Solution Approach 2:
The patent changes the feedback parameter of multicast/broadcast transmissions based on UE capability indicators. The network receives capability information from UEs and adjusts the feedback configuration accordingly, enabling reduced capacity UEs to operate with appropriate feedback levels - minimizing device complexity when feedback is not needed while ensuring communication reliability when service requirements or channel conditions demand it
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control information that schedules a multicast traffic channel transmission and that indicates a bandwidth of the transmission. The UE may receive, in accordance with the control information, one or more instances of the transmission, where a quantity of the one or more instances is based at least in part on the bandwidth of the transmission. Additionally, or alternatively, the UE may receive control information that schedules a multicast traffic channel transmission and that indicates whether the UE is to transmit an acknowledgement in response to the transmission. The UE may receive, in accordance with the control information, the transmission, where the multicast traffic channel transmission is received over a bandwidth that is based at least in part on whether the UE is to transmit the acknowledgement in response to the multicast traffic channel transmission.