Method for measuring confusion rate of a common packet channel in a CDMA communication system
First Claim
1. A method for determining by a UMTS Terrestrial Radio Access Network a persistence value for adjusting a number of access preambles from a plurality of User Equipments (UEs) requiring assignment of a common packet channel (CPCH), the method comprising the steps of:
- counting the number of the access preambles detected in an access preamble period having a predetermined period for each transport format of a plurality of different transport formats, each transport format contains information related to an amount of transmission data and a data rate of each transport format;
determining the persistence value based on the number of counted access preambles for each transport format; and
transmitting the determined persistence value to the UEs in a cell controlled by a Node B,wherein the persistence value is determined based on the amount of transmission data and the data rate of each transport format.
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Abstract
A method is disclosed for determining by a UTRAN a persistence value having a value between 0 and 1 for adjusting a number of access preambles from a plurality of UEs requiring assignment of a common packet channel (CPCH). The method includes the steps of counting a number of the access preambles detected in an access preamble period having a predetermined period; and determining the persistence value based on the number of counted access preambles. The persistence value is determined in a unit of transport format (TF), physical common packet channel (PCPCH), or CPCH set.
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Citations
11 Claims
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1. A method for determining by a UMTS Terrestrial Radio Access Network a persistence value for adjusting a number of access preambles from a plurality of User Equipments (UEs) requiring assignment of a common packet channel (CPCH), the method comprising the steps of:
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counting the number of the access preambles detected in an access preamble period having a predetermined period for each transport format of a plurality of different transport formats, each transport format contains information related to an amount of transmission data and a data rate of each transport format; determining the persistence value based on the number of counted access preambles for each transport format; and transmitting the determined persistence value to the UEs in a cell controlled by a Node B, wherein the persistence value is determined based on the amount of transmission data and the data rate of each transport format. - View Dependent Claims (2, 3)
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4. A method for determining by a UMTS Terrestrial Radio Access Network a persistence value for adjusting a number of CD (Collision Detection) preambles from a plurality of User Equipments (UEs) requiring a Common Packet Channel, the method comprising the steps of:
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counting the number of CD access preambles detected in an access preamble period having a predetermined period for each transport format of a plurality of different transport formats, each transport format contains information related to an amount of transmission data and a data rate of each transport format; determining the persistence value based on the number of counted CD access preambles for each transport format; and transmitting the determined persistence value to the UEs in a cell controlled by a Node B, wherein the persistence value is determined based on the amount of transmission data and the data rate of each transport format. - View Dependent Claims (5, 6)
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7. A method for adjusting common packet channel(CPCH) access preambles from user equipments(UEs) requiring assignment of CPCH, comprising the steps of:
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requesting measurement of the CPCH access attempts; upon receipt of a measurement request, counting the number of the CPCH access preambles transmitted from the UEs during a time unit; reporting the counted number of the CPCH access preambles to a controlling radio network controller(CRNC); determining, in the CRNC, persistence values of each transport format based on the number of the CPCH access preambles reported; and providing the persistence values to the UEs; performing in a UE, a persistence test by using the provided persistence values before transmitting a common packet channel access preamble; transmitting the common packet channel access preamble to a Node B when the persistence test allows the transmission of the common packet channel access preamble; upon receiving an acknowledge message from the Node B, transmitting a collision detection preamble from the UE to the Node B; and transmitting a common packet channel message from the UE to the Node B if the UE received the acknowledge message for the collision detection preamble from the Node B. - View Dependent Claims (8, 9, 10, 11)
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Specification