PRACH Scheduling Across Different Radio Frame Structures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems lack a solution for implementing PRACH scheduling transmission between wireless network devices when the frame structures of uplink and downlink transmission subframes are different, limiting cross-carrier PRACH scheduling in scenarios like carrier aggregation.
Innovation Solution
A method for PRACH scheduling transmission between wireless network devices with different radio frame structures, where PRACH trigger information is sent in a first radio frame and the corresponding preamble sequence is sent in a second radio frame, utilizing predefined mapping relationships between subframe numbers to synchronize communication across differing frame structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing interaction solution is used for PRACH scheduling transmission, then the solution is simple and applicable to same-structure frames, but it cannot be applied to scenarios where uplink and downlink transmission subframes have different frame structures
Solution Approach 1:
The patent introduces configurable parameters including mapping relationship types (first mapping relationship between downlink subframe number and uplink subframe number, second mapping relationship between downlink subframe number and RAR subframe number), time window parameters (RAR time window length N, third mapping relationship parameter), and conditional parameters (fourth mapping relationship for UL-SCH data block transmission). These parameter changes enable the system to adapt to different frame structures while maintaining manageable complexity through standardized configuration mechanisms.
2Adaptability or versatility
If PRACH scheduling transmission is implemented between wireless network devices with different frame structures, then cross-carrier PRACH scheduling is enabled, but the coordination between different frame structures becomes complex
Solution Approach 1:
The patent uses mapping relationships as intermediary mechanisms to coordinate between different frame structures. The first mapping relationship acts as an intermediary to translate downlink subframe numbers to uplink subframe numbers, the second mapping relationship translates downlink subframe numbers to RAR subframe numbers, and the third mapping relationship (when configured) translates uplink subframe numbers to UL-SCH data block subframe numbers. These intermediary mappings simplify the coordination complexity by providing standardized translation layers between different frame structures.
3Reliability
If the RAR time window is extended to cover more transmission subframes, then the probability of successful RAR detection increases, but the time consumption and resource occupation increase
Solution Approach 1:
The patent makes the RAR time window dynamic by allowing its length N to be configurable based on system conditions. The window can be adjusted to balance between detection reliability and time consumption. Additionally, the fourth mapping relationship provides dynamic adaptation for UL-SCH data block transmission timing based on whether the i-th subframe is detected as an uplink transmission subframe, allowing the system to flexibly respond to varying channel conditions and traffic requirements.
Data Source
Figure 1~1.1
Figure 2
Figure 2.1
AI summary
Embodiments of the present invention disclose a radio frame transmission method and a wireless network device. The method includes: receiving physical random access channel PRACH trigger information that is carried in a first transmission subframe in a first radio frame and that is sent by a first wireless network device; and sending, to the first wireless network device in response to the PRACH trigger information, a preamble sequence carried in a second transmission subframe in a second radio frame, where there is a preset first mapping relationship between a subframe number of the first transmission subframe and a subframe number of the second transmission subframe, and a structure of a transmission subframe in the first radio frame is different from a structure of a transmission subframe in the second radio frame. Accordingly, the embodiments of the present invention further disclose a wireless network device. According to the present invention, PRACH scheduling transmission between wireless network devices can be implemented based on cooperation between radio frames with different structures.