Paging Subframe Indicator for Radio Access Network Capacity
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Solution Overview
Problem
Paging in wireless communication systems, such as LTE, faces capacity limitations and overflow issues due to the need to transmit messages to all UEs in a cell, leading to delays and increased power consumption in UEs, especially in large cells with narrowband transmissions.
Innovation Solution
The solution involves transmitting paging messages across multiple sub frames and using an indicator within the control part of a sub frame to signal whether the subsequent sub frame's control part needs to be decoded, allowing for dynamic extension of paging capacity without significantly increasing UE power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paging messages are transmitted in a single sub frame to all UEs in a cell, then paging coverage is ensured, but paging capacity is limited and overflow delays occur
Solution Approach 1:
The patent segments the paging message transmission across multiple sub frames instead of concentrating all paging messages in a single sub frame. The eNB transmits paging messages in a first sub frame and continues transmitting remaining paging messages in a second sub frame, thereby increasing paging capacity while maintaining coverage.
Solution Approach 2:
The patent introduces dynamic adjustment of paging transmission duration based on the number of paging messages. The eNB determines whether to transmit paging messages in one or two sub frames based on the paging message volume, allowing flexible adaptation to different paging loads without fixed timing constraints.
2Loss of time
If the DRX cycle is shortened to reduce overflow delays, then paging response time is improved, but UE power consumption increases
Solution Approach 1:
The patent segments the paging transmission into two phases across two sub frames, allowing the UE to wake up for a shorter duration (first sub frame) and then remain in sleep mode. This reduces the effective paging detection time compared to waiting for the next full DRX cycle, thereby reducing overflow delay without requiring shorter DRX cycles.
Solution Approach 2:
The eNB transmits paging messages in advance during the first sub frame before the UE would need to respond. By preparing and transmitting paging information proactively, the system reduces the waiting time for overflow scenarios without requiring the UE to wake up more frequently, thus reducing power consumption.
3Reliability
If transmit power is increased to reach UEs at cell border, then paging reliability is improved, but data rate decreases and paging capacity is reduced
Solution Approach 1:
The patent segments the paging message transmission across multiple sub frames, allowing the eNB to use lower transmit power for each individual sub frame while still achieving reliable delivery. By distributing the transmission over time rather than concentrating it, the system maintains paging reliability without requiring maximum transmit power, thereby preserving data rate capacity.
Data Source
AI summary
The present invention relates to methods and arrangements of a network node and a UE of a radio access network supporting discontinuous reception, offering a solution that is based on the idea to use more than one sub frame for transmitting paging messages when needed. An indicator in a sub frame with paging messages indicates to the receiving UE if the subsequent sub frame should be read as well.