Method for measuring confusion rate of a common packet channel in a CDMA communication system

• US 7,233,577 B2
• Filed: 04/10/2001
• Issued: 06/19/2007
• Est. Priority Date: 04/10/2000
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Choi, Sung-Ho, Choi, Ho-Kyu, Park, Seong-Ill, Jung, Ki-Ho, Lee, Hyun-Woo
• Primary Examiner(s): To; Doris H.
• Assistant Examiner(s): Moore; Ian N.
• Application Number:
  US09/832,237
• Publication Number:
  US 20030103476A1
• Time in Patent Office: 2,261 Days
• Field of Search: 370/329, 370/337, 370/348, 370/448, 370/229, 370/349, 370/231, 370/470, 370/471, 370/498, 455/452.2, 455/512, 455/527, 455/453
• US Class Current: 370/252
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/322 Power control of broadcast channels
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

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.

Claims

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.

2. The method as claimed in claim 1, wherein the persistence value is determined in a unit of physical common packet channel (PCPCH).

3. The method as claimed in claim 1, wherein the persistence value is determined in a unit of CPCH set.

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:

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.

5. The method as claimed in claim 4, wherein the persistence value is determined in a unit of Physical Common Packet Channel.

6. The method as claimed in claim 4, wherein the persistence value is determined in a unit of CPCH set.

7. A method for adjusting common packet channel(CPCH) access preambles from user equipments(UEs) requiring assignment of CPCH, comprising the steps of:

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.

8. The method as claimed in claim 7, wherein the step of counting the number of CPCH access attempts is performed in a unit of Physical Common Packet Channel.

9. The method as claimed in claim 7, wherein the step of counting the number of CPCH access attempts is performed in a unit of CPCH set.

10. The method as claimed in claim 7, wherein the acknowledge message for the collision detection preamble is a collision detection indicator channel message.

11. The method as claimed in claim 7, wherein the acknowledge message for the collision detection preamble is a collision detection/channel assignment-indicator channel message.