Asymmetric Bandwidth Parts for Multicast Uplink Activation
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Solution Overview
Problem
In 5G wireless communication systems, user equipment (UE) faces challenges when switching from unicast to multicast bandwidth parts (BWP) as it lacks an active uplink resource for transmitting data, particularly for services with strict latency requirements, as multicast BWP does not have a paired uplink BWP, leading to difficulties in sending uplink data.
Innovation Solution
Configuring transmission resources on uplink BWPs for UEs to transmit signals requesting the activation of associated downlink BWPs or control resource sets, allowing for seamless switching between unicast and multicast BWPs while maintaining continuous data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE switches to a multicast BWP to receive multicast services, then multicast service reception is enabled, but the UE lacks an active uplink BWP for transmitting uplink data
Solution Approach 1:
The patent configures multiple uplink BWPs that can serve different functions. Specifically, a first uplink BWP is configured for unicast services and a second uplink BWP is configured for multicast services. The UE can switch between these uplink BWPs based on the active downlink BWP, ensuring that an appropriate uplink resource is always available regardless of whether the UE is receiving unicast or multicast services.
Solution Approach 2:
The patent implements dynamic BWP switching mechanisms where the UE can switch between different uplink BWPs based on the active downlink BWP. When the UE switches from a unicast downlink BWP to a multicast downlink BWP, it also switches from the first uplink BWP to the second uplink BWP. This dynamic adaptation ensures continuous uplink capability while receiving different types of services.
2Reliability
If uplink data transmission is delayed until after multicast services end, then resource conflicts are avoided, but latency requirements cannot be met
Solution Approach 1:
The patent segments the uplink BWP resources into multiple independent BWPs (first uplink BWP for unicast, second uplink BWP for multicast). This segmentation allows simultaneous operation of different service types without resource conflicts. The UE can transmit uplink data on the second uplink BWP while receiving multicast services on the multicast downlink BWP, eliminating the need to wait for multicast services to end.
Solution Approach 2:
The patent introduces a mapping relationship between downlink BWPs and uplink BWPs as an intermediary mechanism. Each downlink BWP is associated with specific uplink BWPs through configuration parameters. This intermediary mapping enables the UE to automatically determine which uplink BWP to use based on the active downlink BWP, ensuring seamless switching and continuous transmission capability.
Data Source
AI summary
Methods, apparatus and systems for transmitting data based on asymmetric bandwidth parts in a wireless communication are disclosed. In one embodiment, a method performed by a wireless communication node is disclosed. The method comprises: configuring at least one downlink bandwidth part (BWP) for a wireless communication device, wherein each of the at least one downlink BWP is configured for a downlink transmission to the wireless communication device; configuring at least one uplink BWP for the wireless communication device, wherein each of the at least one uplink BWP is configured for an uplink transmission from the wireless communication device; and configuring a transmission resource on one uplink BWP of the at least one uplink BWP for the wireless communication device to transmit an uplink signal on the transmission resource. The uplink signal indicates a request for activating an associated downlink BWP.