Scheduled Receiver Paging for Downlink Small Data in RRC-Inactive UEs
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Solution Overview
Problem
Current communication systems face inefficiencies in handling small data transmissions to user equipment (UE) in inactive states, leading to increased energy consumption, signaling overhead, and latency due to the need for transitioning to a fully connected state for mobile-terminated data.
Innovation Solution
A mechanism for configuring UE receivers to enable and disable electronic components according to a schedule or paging cycle, using dedicated and shared radio resources, and indicating traffic patterns in paging messages to manage small data transmissions without fully connecting to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions to RRC_CONNECTED state for mobile-terminated small data transmission, then the data can be transmitted reliably, but the signaling overhead and latency increase significantly
Solution Approach 1:
The patent segments the data transmission process into two parts: (1) a paging message containing a trigger indicator that wakes up the UE and indicates upcoming SDT, and (2) the actual small data transmission. This segmentation allows the UE to remain in RRC_INACTIVE state while still receiving data, avoiding the need for full RRC connection establishment and reducing signaling latency.
Solution Approach 2:
The gNB performs preliminary action by sending a paging message with a trigger indicator before the actual small data transmission. This preliminary indication allows the UE to prepare its receiver in advance while remaining in RRC_INACTIVE state, enabling faster data reception without full connection establishment.
2Productivity
If the UE keeps the receiver active to receive small data transmissions, then the data can be received without delay, but the energy consumption increases
Solution Approach 1:
The patent implements periodic action through configured paging cycles where the UE's receiver is activated only during specific paging occasions. The gNB sends paging messages with SDT indicators during these periodic windows, allowing the UE to maintain low power consumption by keeping the receiver inactive most of the time while still enabling timely data reception when needed.
3Use of energy by moving object
If the UE remains in RRC_INACTIVE state for small data transmission, then energy consumption is reduced, but the amount of data that can be transmitted is limited by the short active periods
Solution Approach 1:
The patent enables continuity of useful action by allowing multiple small data transmissions to occur while the UE remains in RRC_INACTIVE state across different paging cycles. The UE's receiver is activated periodically according to configured paging cycles, enabling continuous data reception capability without transitioning to RRC_CONNECTED state, thus maintaining low power consumption while accumulating larger data volumes over time.
Data Source
AI summary
A first communication apparatus of a radio access network transmits paging messages to one or more second communication apparatus in accordance with a paging scheme. The one or more second communication apparatus configure their receivers to be enabled accordingly, while remaining in an operating mode in which they are not fully connected to the first communication apparatus. Small data transmissions may be transmitted from the first to the one or more second communication apparatus after appropriately configuring the receivers of the one or more second communication apparatus to be enabled, while remaining in the operating mode in which they are not fully connected to the first communication apparatus. The required configuration information, in particular a periodicity of a traffic pattern and/or radio resources used for transmitting, is transmitted by the first communication apparatus in a paging message.