Radio Access Point Scrambling Code Allocation for Dense Indoor Deployment
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Solution Overview
Problem
Current 3GPP wireless communication standards limit the number of neighbor cell entries in the list broadcasted by macro and RAP devices, making it insufficient to uniquely identify each enterprise RAP cell within a macro cell coverage area, leading to challenges in handover processes.
Innovation Solution
The solution involves a registration process where RAP devices can register with a macro cell identifier and primary scrambling code, allowing for the allocation of shared radio access point cell identifiers when conflicts arise, enabling multiple RAP devices to share the same primary scrambling code and expanding the number of deployable RAP devices within a macro cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of neighbor cell entries is limited to 32 intra-frequency and 32 inter-frequency entries as per 3GPP standards, then the system maintains standard compliance and manageable complexity, but the system cannot uniquely identify each enterprise RAP cell within a macro cell coverage area when there are more than 64 RAP devices
Solution Approach 1:
The patent introduces a new dimension to cell identification by combining multiple identifier components: macro cell identifier, RAP device identifier, and primary scrambling code. This multi-dimensional identification system allows uniquely identifying RAP cells beyond the limitations of traditional 3GPP neighbor cell entry formats, enabling support for more than 64 RAP devices per macro cell while maintaining proper identification and handover capabilities.
2Adaptability or versatility
If multiple RAP devices share the same primary scrambling code to expand deployment capacity, then the number of deployable RAP devices increases, but handover processes become more complex due to identifier conflicts
Solution Approach 1:
The patent segments the cell identification and handover process into distinct phases: registration phase where RAP devices are assigned unique combined identifiers, and handover phase where clients use simplified neighbor cell lists. During registration, the system manages identifier allocation and conflict resolution centrally, while during handover, clients perform measurements and report based on the segmented identifier structure, reducing the complexity burden on the handover process itself.
Solution Approach 2:
The patent introduces a central controller as an intermediary between macro base stations and RAP devices to manage identifier allocation and conflict resolution. This intermediary entity coordinates the registration process, assigns unique combined identifiers to RAP devices sharing the same macro cell, and maintains the neighbor cell list information, thereby simplifying the handover process for client devices while enabling expanded RAP device deployment.
3Reliability
If RAP devices are deployed densely within macro cell coverage areas to improve indoor signal coverage, then service coverage is enhanced, but the fixed neighbor cell entry limit becomes insufficient for unique identification
Solution Approach 1:
The patent extends the identification capacity by adding dimensional components to the cell identifier structure. Instead of relying solely on traditional 3GPP neighbor cell entry formats with limited entries, the system uses a multi-component identifier combining macro cell identifier, RAP device identifier, and primary scrambling code. This dimensional expansion enables unique identification of densely deployed RAP devices while maintaining reliable signal coverage and handover functionality.
Data Source
AI summary
Techniques are provided to allow more than a fixed number of radio access point devices to be deployed within a macro cell. At a controller apparatus, a registration request is received from a radio access point device configured to operate in a wireless network to serve one or more wireless client devices in the wireless network in respective relatively small coverage areas. The registration request comprises a macro cell identifier associated with a macro cell base station configured to operate in the wireless network to serve one or more wireless client devices in a relatively large coverage area, a radio access point cell identifier associated with the radio access point device, and a particular primary scrambling code selected for use by the radio access point device. When the particular primary scrambling code is not available for use, methods are provided to allocate it in a shared manner but without degrading handover service.