Group Identifier Uplink Transmission for Shared Resources
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently supporting a large number of user equipments (UEs) sharing the same uplink transmission resources, leading to increased processing load at base stations and congestion due to autonomous retransmissions without effective congestion mitigation techniques.
Innovation Solution
UEs are assigned a group identifier in addition to a user equipment identifier, allowing them to transmit messages scrambled with the group identifier, and retransmit based on response messages containing either the group or user equipment identifier, reducing signaling overhead and processing at the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual user equipment identifiers are used for each UE transmitting on shared uplink resources, then each UE can be uniquely identified, but signaling overhead and base station processing load increase significantly
Solution Approach 1:
The patent merges multiple individual UE identifiers into a single group identifier that represents multiple UEs sharing uplink resources. When a UE transmits using the group identifier, the base station processes the transmission once for the entire group rather than individually for each UE, significantly reducing processing load while maintaining the ability to identify and respond to specific UEs when needed.
Solution Approach 2:
The group identifier serves multiple functions: it enables collective identification of all UEs in the group for resource allocation, reduces signaling overhead by representing multiple UEs with a single identifier, and allows the base station to efficiently manage shared uplink resources without processing individual UE identifiers for every transmission.
2Reliability
If UEs autonomously retransmit messages without coordination, then transmission reliability improves, but congestion increases on shared uplink resources
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors transmissions from multiple UEs using group identifiers and provides feedback control signals. When congestion is detected or when UEs fail to successfully transmit, the base station sends feedback that coordinates retransmission timing, preventing uncoordinated autonomous retransmissions from causing congestion while maintaining transmission reliability through controlled retries.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In a wireless communications system, a first user equipment (UE) may use techniques to transmit data over a configured grant shared by multiple UEs. The first UE may receive a control message indicating a group identifier assigned to a group of UEs including the first UE, and indicating multiple up-link transmission resources allocated to the group. The first UE may transmit a message scrambled by the group identifier during a first uplink transmission, where the message may include a user equipment identifier of the first UE. In identifier or the user equipment identifier based on transmitting the message. If the response message includes the group identifier, the UE may retransmit the message until the response message includes the user equipment identifier.