Multi-Panel Random Access Using Common Property Units
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Solution Overview
Problem
In multi-panel user equipment (UE) systems, the varying fading characteristics and timing synchronization issues across geographically distributed panels lead to differences in channel properties such as phase noise, frequency offset, and timing offset, complicating the random access procedure in wireless communication systems.
Innovation Solution
A method for performing a random access procedure in a wireless communication system where the physical random access channel (PRACH) preamble is transmitted based on a specific unit related to a common property, such as timing advance (TA) or transmission power control (TPC), which can be associated with a component carrier (CC) or bandwidth part (BWP, and includes transmitting UE capability information related to the number of specific units, with the specific unit determined by association information like ID or mapping information between the specific unit and radio network temporary identifier (RNTI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple panels are used to improve communication coverage and capacity, then the system can handle more data traffic and provide better service, but differences in fading characteristics, timing synchronization, and channel properties between panels increase system complexity and reduce reliability
Solution Approach 1:
The patent segments the random access procedure by introducing separate RA procedures for different panels. Each panel performs independent random access, allowing the system to handle multiple data streams simultaneously while maintaining reliable connection establishment for each panel individually, thus resolving the contradiction between increased productivity and maintained reliability
Solution Approach 2:
The patent applies partial action by allowing selective panel activation and independent random access only when needed. Not all panels must simultaneously perform random access - the system can activate specific panels based on traffic requirements, reducing overall system complexity while maintaining the capability to handle increased data traffic when necessary
2Area of stationary object
If geographically distributed panels are deployed to enhance network coverage, then service area is expanded, but timing synchronization problems arise due to cable length differences
Solution Approach 1:
The patent applies local quality by allowing each panel to have independent timing advance values and random access parameters tailored to its specific geographic location and cable characteristics. This localized configuration enables each panel to optimize its timing synchronization independently, compensating for cable length differences and maintaining accurate timing despite geographically distributed deployment
Solution Approach 2:
The patent implements preliminary action by performing timing synchronization and cable length compensation during the initial random access phase. The network estimates cable lengths and configures appropriate timing advance values before actual data transmission begins, preventing timing synchronization problems from affecting subsequent communications
3Adaptability or versatility
If different hardware components are used for each panel to improve system flexibility and performance, then adaptability is enhanced, but differences in phase noise, frequency offset, and timing offset increase
Solution Approach 1:
The patent segments channel estimation and compensation operations by panel, allowing each panel with its unique hardware characteristics to have independent channel property measurements and corrections. This enables the system to accommodate diverse hardware configurations while maintaining precise channel knowledge for each panel, resolving the contradiction between adaptability and measurement precision
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting panel-specific parameters such as frequency offset compensation values, phase noise correction factors, and timing advance settings based on measured channel conditions. This allows the system to adapt to different hardware components while maintaining consistent communication performance across all panels
4Ease of operation
If a unified random access procedure is used for all panels to simplify system operation, then ease of operation is improved, but it cannot account for panel-specific characteristics leading to performance degradation
Solution Approach 1:
The patent implements universality by creating a standardized random access framework that can be applied to any panel regardless of its specific characteristics. The same basic random access procedure and message structure are used across all panels, providing ease of operation while the framework accommodates panel-specific parameters and independent execution, thereby maintaining high success rates
Data Source
AI summary
A method of performing, by a user equipment (UE), a random access procedure in a wireless communication system according to an embodiment of the present disclosure comprises transmitting a physical random access channel (PRACH) preamble, and receiving a random access response (RAR). The PRACH preamble is transmitted based on a specific unit, and the specific unit is related to a common property.