WiMAX Scanning Response BS ID Sequence Indication Field
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Solution Overview
Problem
The existing WIMAX system's air interface resource utilization is inefficient due to the high resource consumption when representing BS IDs in Full BS ID mode during the scanning process, which hinders the improvement of communication quality and handover efficiency.
Innovation Solution
The method involves representing BS IDs in the MOB_SCN_RSP message using a BS ID sequence indication field, either in BS Index mode or BS Bitmap mode, which reduces the bit requirement from 48 bits to 8 or 1 bit per ID, thereby optimizing the air interface resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Full BS ID mode is used to represent BS IDs in MOB_SCN_RSP message, then the identification accuracy of base stations is improved, but the air interface resource consumption increases significantly
Solution Approach 1:
The patent segments the BS ID representation into two distinct modes: Full BS ID mode (48 bits) for complete identification when needed, and BS Index mode (8 bits) for efficient reference when the base station is already identified. This segmentation allows the system to use the appropriate level of detail based on context, reducing overall resource consumption while maintaining identification accuracy when required.
Solution Approach 2:
The patent changes the parameter representation from fixed 48-bit Full BS ID to variable-length representation using BS Index (8 bits) when the base station is already identified in the MOB_NBR_ADV message. This parameter change adapts the data representation to the specific context, using minimal bits when possible and full identification only when necessary, thereby optimizing air interface resource utilization.
2Loss of information
If Full BS ID (48 bits) is used in scanning response message, then the completeness of base station information is improved, but the message length and transmission overhead increase
Solution Approach 1:
The patent segments the information completeness requirement into two parts: the MOB_NBR_ADV message provides the complete base station identification information first, and the subsequent MOB_SCN_RSP message only needs to reference this information using a compact BS Index. This segmentation distributes the information across multiple messages, allowing the response message to be concise while the system as a whole maintains complete information.
Solution Approach 2:
The patent introduces an intermediary mechanism where the MOB_NBR_ADV message acts as a reference catalog that defines the mapping between BS Index values and Full BS IDs. This intermediary allows the MOB_SCN_RSP message to use compact references instead of repeating full identifiers, reducing transmission overhead while maintaining information completeness through the reference relationship.
3Quantity of substance
If BS Index mode is used to represent BS IDs, then the air interface resource utilization is improved, but the system complexity increases due to mode switching requirements
Solution Approach 1:
The patent applies preliminary action by having the network send the MOB_NBR_ADV message first, which establishes the mapping relationship between BS Index values and Full BS IDs before the scanning process begins. This preliminary establishment of the reference framework eliminates the need for complex real-time mode switching during scanning, as both the base station and mobile station already have the mapping information available.
Solution Approach 2:
The patent uses feedback mechanisms where the base station includes the MOB_NBR_ADV message in the downlink, providing the mapping information that enables the mobile station to correctly interpret BS Index references in subsequent MOB_SCN_RSP messages. This feedback loop ensures both parties maintain consistent understanding of the index-to-identifier mapping, reducing complexity through synchronized information.
Data Source
AI summary
Methods and apparatus are provided to respond to a scanning request to further improve the utilization rate of air interface resources. A scanning response message is sent to a mobile station in response to a scanning request received from the mobile station. The scanning response message can be in the form of a MOB_SCN_RSP message that includes a BS ID sequence indication field that maps the BS IDs carried in the MOB_SCN_REQ message.