Subscriber Station Bandwidth Request for Ranging Process
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Solution Overview
Problem
In IEEE 802.16 and 802.16e standards, the initial network entry process for Subscriber Stations (SS) in Broadband Wireless Access communication systems is hindered by insufficient UpLink (UL) resource allocation during the ranging process, leading to failed transmissions of Ranging Request (RNG_REQ) messages.
Innovation Solution
The proposed solution involves the Subscriber Station sending a Bandwidth Request message with an initial ranging Connection Identifier (CID) to the Base Station when UL resources are insufficient, allowing the Base Station to re-allocate resources through a CDMA_Allocation_IE, ensuring sufficient bandwidth for successful message ranging, and optionally including 'Ranging Status Indication' information to request additional bandwidth for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the Base Station allocates UL bandwidth for RNG_REQ message transmission through CDMA_Allocation_IE, then the SS can transmit ranging requests, but the allocated bandwidth may be insufficient for the SS to transmit the complete RNG_REQ message
Solution Approach 1:
The patent applies preliminary action by having the SS send a Bandwidth Request message before transmitting the RNG_REQ message. This allows the BS to allocate sufficient UL bandwidth in advance through CDMA_Allocation_IE, ensuring the SS can transmit the complete RNG_REQ message without bandwidth insufficiency issues.
2Quantity of substance
If the SS re-attempts code ranging to transmit RNG_REQ message, then the SS can request bandwidth allocation, but this increases the time required for network entry
Solution Approach 1:
The patent eliminates the need for re-attempting code ranging by implementing a preliminary Bandwidth Request message that enables the BS to allocate sufficient UL resources before RNG_REQ transmission. This direct approach reduces network entry time by avoiding unnecessary code ranging re-attempts.
3Productivity
If the BS does not allocate sufficient UL resource, then the UL resource allocation is efficient for other SS, but the specific SS cannot transmit RNG_REQ message
Solution Approach 1:
The patent applies self-service by enabling each SS to autonomously request the bandwidth it needs through the Bandwidth Request message. The SS evaluates its own RNG_REQ message size and requests appropriate UL resources, allowing the system to maintain efficient overall resource utilization while ensuring individual SS can transmit their messages successfully.
Data Source
AI summary
Provided is a system and method for performing a ranging process in a communication system. If a Subscriber Station (SS) detects the insufficiency of UpLink (UL) resources for transmission of a Ranging Request (RNG_REQ) message during the ranging process, it transmits a UL resource allocation request message requesting additional allocation of the UL resources to a Base Station (BS) for additional transmission of the RNG_REQ message to cause the BS to additionally allocate the UL resources for the additional transmission of the RNG_REQ message.