Paging Message Detection via PDCCH Resource Indication
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Solution Overview
Problem
In LTE communication systems, user equipment (UE) in areas with poor signal quality faces challenges in receiving paging messages due to increased resource occupation and delay caused by repeated transmissions on physical downlink shared channels (PDSCH) and physical downlink control channels (PDCCH).
Innovation Solution
A method and apparatus that allow UE to determine a paging cycle, frame, and occasion subframe based on system parameters and configuration information, including time-frequency information, to detect paging messages on PDSCH without relying on PDCCH, thereby reducing resource occupation and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a base station repeatedly sends a paging message by using PDSCH and PDCCH to ensure that UE located in a coverage area with poor signal quality normally receives the paging message, then the reliability of paging message reception is improved, but the resources occupied by the paging message on PDSCH and PDCCH increase and the paging delay increases
Solution Approach 1:
The patent segments the paging message transmission into two parts: a first part sent on PDCCH and a second part sent on PDSCH. The UE first detects the P-RNTI on PDCCH, then uses the resource indication from PDCCH to receive the actual paging message on PDSCH. This segmentation allows the system to achieve reliable reception without requiring excessive repetitions of the entire paging message on both channels simultaneously.
Solution Approach 2:
The PDCCH acts as an intermediary that carries resource indication information to guide the UE in receiving the paging message on PDSCH. Instead of directly transmitting the paging message repeatedly on both channels, the system uses PDCCH as a mediator to provide scheduling information, reducing the overall resource occupation while maintaining reliability.
2Reliability
If a base station repeatedly sends a paging message by using PDSCH and PDCCH to ensure that UE located in a coverage area with poor signal quality normally receives the paging message, then the reliability of paging message reception is improved, but the paging delay increases
Solution Approach 1:
By segmenting the paging transmission into PDCCH indication and PDSCH message delivery, the system can optimize the timing of each part. The UE can quickly detect the P-RNTI on PDCCH and then receive the paging message on PDSCH at the indicated time, reducing overall paging delay compared to repeated transmissions on both channels.
Solution Approach 2:
The base station performs preliminary action by sending the resource indication information on PDCCH before sending the actual paging message on PDSCH. This allows the UE to prepare for receiving the paging message at the correct time and frequency resources, reducing detection time and overall paging delay while maintaining reliable reception.
3Quantity of substance
If the UE detects paging messages on PDSCH without relying on PDCCH, then the resource occupation is reduced, but the difficulty of detecting and measuring increases
Solution Approach 1:
The PDCCH serves as an intermediary that provides resource indication information to the UE, enabling the UE to efficiently detect and measure the paging message on PDSCH without having to blindly search the entire PDSCH. The P-RNTI on PDCCH acts as a pointer that guides the UE to the correct time-frequency resources on PDSCH, reducing detection difficulty while minimizing resource occupation.
Data Source
AI summary
Embodiments provide a paging method and apparatus. The method includes receiving, by user equipment (UE), a system message broadcast by a base station, where the system message carries a system parameter and configuration information of a paging message, and the configuration information includes time-frequency information of the paging message. The method also includes determining, by the UE, a paging cycle, a paging frame (PF) and a paging occasion (PO) subframe according to the system parameter, and determining, by the UE according to the configuration information, a time-frequency resource occupied by the paging message in the PO subframe. The method also includes detecting, by the UE within the paging cycle according to the PF, the PO subframe, and the time-frequency resource, whether the paging message exists in a physical downlink shared channel PDSCH.