LTE Paging via ePDCCH Using UE Capability Reporting
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Solution Overview
Problem
In LTE networks, when a UE is in RRC_IDLE state, the network faces challenges in distinguishing whether the UE monitors the paging RNTI in ePDCCH or PDCCH, and there are no defined paging procedures for ePDCCH, making it difficult to effectively transmit paging messages.
Innovation Solution
The network and UE communicate to determine the UE's capability to monitor ePDCCH, with the UE reporting support for ePDCCH reception, and the network using this information to selectively transmit paging messages via either PDCCH or ePDCCH based on the UE's capabilities and state, ensuring efficient paging message delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network transmits paging messages using both PDCCH and ePDCCH to ensure compatibility with all UEs, then the reliability of paging message delivery is improved, but the system overhead and resource consumption increase
Solution Approach 1:
The patent changes the parameter of control channel type based on UE capability. The network determines whether a UE supports ePDCCH and selectively uses PDCCH or ePDCCH for paging message transmission. This parameter change resolves the contradiction by adapting the transmission method to the specific UE capability, ensuring reliable delivery to both ePDCCH-capable and non-capable UEs without unnecessarily increasing system overhead for all UEs.
Solution Approach 2:
The patent implements dynamic selection of the control channel type (PDCCH or ePDCCH) based on real-time UE capability information. The network dynamically adjusts the paging message transmission method according to the UE's reported capabilities, rather than using a static approach. This dynamic adaptation allows the system to optimize resource usage while maintaining reliable paging delivery for all UE types.
2Quantity of substance
If the network selectively transmits paging messages via ePDCCH only to UEs that support it, then the system overhead is reduced, but the adaptability to different UE capabilities deteriorates
Solution Approach 1:
The patent implements dynamic adaptation to different UE capabilities through capability reporting and recognition mechanisms. UEs report their ePDCCH support capability to the network, which then dynamically selects the appropriate control channel type for paging message transmission. This dynamic approach maintains adaptability to different UE capabilities while optimizing system overhead by avoiding unnecessary transmissions on both PDCCH and ePDCCH for the same UE.
Solution Approach 2:
The patent segments the UE population into different capability groups (ePDCCH-capable and non-capable UEs) and applies different paging transmission methods to each segment. This segmentation allows the network to optimize resource usage for each group separately, reducing overall system overhead while maintaining full adaptability to different UE capabilities through capability-specific transmission strategies.
3Measurement precision
If the network monitors UE capability information to determine the appropriate control channel for paging, then the precision of paging message delivery is improved, but the complexity of the paging procedure increases
Solution Approach 1:
The patent performs capability detection in advance through UE capability reporting mechanisms that operate during normal UE registration and connection procedures. By determining UE ePDCCH capability beforehand, the network avoids the need for complex real-time capability detection during paging operations. This preliminary action simplifies the actual paging procedure while maintaining high precision in UE capability detection.
Solution Approach 2:
The patent implements self-service capability reporting where UEs autonomously report their ePDCCH support capabilities to the network without requiring complex network-side probing or testing. This self-service approach reduces the complexity of the paging procedure by eliminating the need for intricate capability detection mechanisms, while still achieving precise UE capability detection through the UE's own capability information.
Data Source
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AI summary
Methods are disclosed for supporting transmission of broadcast messages using multiple types of control channels. An example method begins with receiving (1110) a message from each of several user terminals, each message indicating whether the corresponding user terminal supports the receipt of broadcast messages via the second control channel type. In some embodiments, one or more of these messages may indicate that the corresponding user terminal monitors only the second control channel type for broadcast messages. The control node subsequently initiates (1120) a transmission of a broadcast message to one of the user terminals from one or more base stations in a tracking area for the user terminal. This initiation includes indicating to the one or more base stations whether user terminal supports the receipt of broadcast messages via the second control channel type, based on information earlier received by the control node.