Wireless Terminal Ranging Process Load Reduction
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Solution Overview
Problem
In wireless portable Internet systems, the increasing number of access terminals leads to a higher load for access terminals in processing ranging response messages from access points, necessitating an efficient ranging process to reduce this load and improve processing efficiency.
Innovation Solution
A ranging method and terminal design that involves receiving and analyzing UL-MAP messages to select uplink resources, transmitting CDMA codes, and controlling transmission parameters based on matching ranging parameters, with the ability to terminate the receipt of ranging response messages after a predetermined time if no matching response is received, thereby reducing processing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access terminal receives and processes all RNG_RSP messages broadcasted from the access point, then the ranging process can be completed for all access terminals, but the load of the access terminal is increased
Solution Approach 1:
The patent extracts only the relevant RNG_RSP messages that correspond to the specific access terminal's ranging request by comparing the terminal identifier and ranging parameters. This extraction principle filters out unnecessary messages from the broadcast stream, reducing processing load while ensuring the correct ranging response is captured.
Solution Approach 2:
The patent applies local quality by making the processing capability selective rather than uniform. The access terminal processes messages with different scrutiny levels - specifically checking for matching terminal IDs and ranging parameters only in messages relevant to its ranging operation, rather than uniformly processing all broadcast messages.
2Reliability
If the access terminal periodically performs initial stage and adjusting stage at regular intervals, then the ranging parameters can be maintained, but the processing frequency and load increase
Solution Approach 1:
The patent implements periodic action by having the access terminal perform ranging operations at predetermined intervals. The terminal periodically checks whether to perform a ranging operation based on stored parameters and current conditions, and periodically transmits ranging requests and processes responses when needed, rather than continuously processing messages.
Solution Approach 2:
The patent applies dynamics by making the ranging operation conditional and adaptive. The access terminal dynamically determines whether to perform ranging based on current system conditions and stored parameters, adjusting its behavior rather than following a rigid periodic schedule. This allows the terminal to skip unnecessary ranging operations when parameters are already valid.
3Productivity
If the number of access terminals increases, then the network capacity is improved, but the number of RNG_RSP messages increases causing higher processing load
Solution Approach 1:
The patent extracts only the specific RNG_RSP message relevant to each access terminal from the broadcast stream. By comparing terminal identifiers and ranging parameters, each terminal extracts only its designated response message, reducing the processing burden despite an increased number of terminals and messages in the network.
Solution Approach 2:
The patent segments the broadcast message stream into individual terminal-specific responses by including terminal identifiers in the RNG_RSP messages. This segmentation allows each access terminal to independently identify and process only its own response message without being affected by the presence of other terminals.
Data Source
AI summary
A ranging method of an access terminal comprising receiving and analyzing UL-MAP/DL-MAP; selecting a given uplink sub-channel number and a symbol number from the UL_MAP when a ranging event is generated; requesting a ranging process by transmitting a CDMA code; receiving a ranging response message broadcasted from the access point; extracting a CDMA code, a sub-channel number, and a symbol number from the received ranging response message, comparing the extracted result and the stored ranging parameters, and adjusting transmission power, timing, and frequency offset on the basis of the extracted result or discarding the ranging response message; and terminating a ranging response message receipt operation.