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CE Overbooking

The document discusses the calculation of credit resource usage for HSUPA UEs by the RNC, highlighting a discrepancy between calculated and actual CE usage due to UE rate variations. To improve admission control, Huawei introduces CE Overbooking, allowing NodeB to report actual CE usage to the RNC. This enhancement enables the RNC to make more accurate admission control decisions based on real-time credit resource usage.

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Ratna Prasad
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62 views1 page

CE Overbooking

The document discusses the calculation of credit resource usage for HSUPA UEs by the RNC, highlighting a discrepancy between calculated and actual CE usage due to UE rate variations. To improve admission control, Huawei introduces CE Overbooking, allowing NodeB to report actual CE usage to the RNC. This enhancement enables the RNC to make more accurate admission control decisions based on real-time credit resource usage.

Uploaded by

Ratna Prasad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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After WRFD-010638 Dynamic CE Resource Management is applied, the RNC calculates the credit

resource usage of an admitted HSUPA UE by using the following formula:

Credit resource usage = Max (Credit resources required for ensuring the GBR, Credit resources required
for transmitting one RLC PDU)

In the preceding formula, GBR stands for guaranteed bit rate and RLC PDU stands for Radio Link Control
packet data unit. The RNC performs this calculation to ensure HSUPA user experience. However, the
actual CE usage of the NodeB is lower than the calculated credit resource usage of the RNC. This is
because the NodeB calculates the actual CE usage based on the UE rate. The UE rate is lower than the
GBR or the rate at which an RLC PDU is transmitted in most cases due to the high penetration rate of
smart phones with a 2 ms HSUPA transmission time interval (TTI). As a result, the RNC may reject new
UE access attempts even if the actual CE usage of the NodeB is low. This limits the RNC's capability to
perform admission control based on credit resource usage.

To address this issue, Huawei introduces CE Overbooking. With this feature, the NodeB calculates the
actual CE usage of admitted UEs, includes the calculated CE usage in a private information element (IE)
in the Common Measurement Report message, and sends the report to the RNC every measurement
report period .The RNC then directly uses the reported CE usage as the credit resource usage. This
maximizes the RNC's capability to perform admission control based on credit resource usage.

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