Virtual buffer size management system for the transmission of blocks of data bits in an HS-DSCH downlink channel of a mobile communications network

• US 20050220024A1
• Filed: 03/30/2005
• Published: 10/06/2005
• Est. Priority Date: 03/31/2004
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Evolium SAS (Nokia Corporation)
• Inventors: Agin, Pascal, Stefanini, Remi
• Granted Patent: US 7,545,731 B2
• Time in Patent Office: Days
• US Class Current: 370/235
• CPC Class Codes: H04L 1/0013 Rate matching, e.g. puncturing or repetition of code symbols
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy

Abstract

A system (D) is dedicated to managing the size of a virtual buffer (MTV) of a rate matching system (SOD) for matching the transmission bit rate of blocks of data bits in a set of HS-PDSCH physical channels associated with an HS-DSCH downlink transport channel and set up between a base station of a communications network and one or more user equipments. The system (SOD) comprises: i) a first rate matching stage (FRM) for matching the number of input bits coming from the HS-DSCH transport channel of a block to be transmitted to the equipment to a selected number of intermediate bits, ii) a virtual buffer (MTV) able to store the selected number of intermediate bits until reception by the base station in the context of an HARQ procedure of an acknowledgement indicating correct reception of the block by the equipment (UE), and iii) a second rate matching stage (SRM) for matching the selected number of intermediate bits to a number of output bits equal to the maximum number of bits that can be transmitted by the set. The system (D) is adapted to supply a selected number of intermediate bits such that the first stage (FRM) is able to match the number of input bits to the number of intermediate bits and the second stage (SRM) is able to match the number of intermediate bits to the number of output bits that can be transmitted by the set without adding any bits.

Claims

1. A buffer size management system (D) for a rate matching system (SOD) for matching the transmission bit rate of blocks of data bits in a set of HS-PDSCH physical channels comprising one or more HS-PDSCH physical channels associated with an HS-DSCH downlink transport channel and set up between a base station (Node B) of a communications network and one or more user equipments (UE), said rate matching system (SOD) comprising:

i) a first rate matching stage (FRM) for matching the number of input bits coming from said HS-DSCH transport channel of a block to be transmitted to said equipment (UE) to a selected number of intermediate bits, ii) a virtual buffer (MTV) able to store the selected number of intermediate bits until reception by said base station (Node B) of an acknowledgement indicating correct reception of said block by said equipment (UE) in the context of an HARQ procedure, and iii) a second rate matching stage (SRM) for matching the selected number of intermediate bits to a number of output bits equal to the maximum number of bits that can be transmitted by said set in a given time interval, which management system is characterized in that it is adapted to supply a selected number of intermediate bits such that said first stage (FRM) is able to match said number of input bits to the number of intermediate bits and said second stage (SRM) is able to match said number of intermediate bits to the number of output bits that can be transmitted by said set associated with said HS-DSCH transport channel without adding any bits.

2. A system according to claim 1, characterized in that it is adapted to supply a number of intermediate bits at least equal to a minimum value (S_min) equal to the maximum number of bits that can be transmitted by said set.

3. A system according to claim 2, characterized in that it is adapted to supply a number of intermediate bits at least equal to another value (S_opt) greater than said minimum value (S_min).

4. A system according to claim 3, characterized in that said other value (S_opt) is equal to said number of input bits at the input of said first stage (FRM) coming from the HS-DSCH transport channel.

5. A system according to claim 4, characterized in that said number of input bits is equal to the sum of a selected constant and six times a payload information bit rate (R) in kilobits per second that said equipment (UE) is able to receive.

6. A system according to claim 5, characterized in that said constant is equal to 84.

7. A system according to claim 1, characterized in that it is adapted to determine said number of intermediate bits.

8. A rate matching system (SOD) for matching the transmission bit rate of blocks of data bits in a set of HS-PDSCH physical channels comprising one or more HS-PDSCH physical channels associated with an HS-DSCH downlink transport channel and set up between a base station (Node B) of a communications network and one or more user equipments (UE), said rate matching system (SOD) comprising:

i) a first rate matching stage (FRM) for matching the number of input bits coming from said HS-DSCH transport channel of a block to be transmitted to said equipment (UE) to a selected number of intermediate bits, ii) a virtual buffer (MTV) able to store the selected number of intermediate bits until reception by said base station (Node B) in the context of an HARQ procedure of an acknowledgement indicating correct reception of said block by said equipment (UE), and iii) a second rate matching stage (SRM) for matching the selected number of intermediate bits to a number of output bits equal to the maximum number of bits that can be transmitted by said set in a given time interval, which rate matching system is characterized in that it includes a management system (D) according to any one of the preceding claims.

9. A transport channel coding system (SCCT) for a communications network, characterized in that it comprises a rate matching system (SOD) according to claim 8 for organizing the transmission bit rate of blocks of data bits.

10. A transport channel coding system (SCCT) for a communications network, characterized in that it comprises a management system (D) according to claim 1.