System and method for a virtual soft handover in a high data rate network based on data transmission information

• US 6,865,389 B2
• Filed: 09/05/2001
• Issued: 03/08/2005
• Est. Priority Date: 09/05/2001
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktienbolaget L.M. Ericsson
• Inventors: Lee, Bo, Wang, Yvonne
• Primary Examiner(s): Tsang, Fan
• Assistant Examiner(s): GENACK, MATTHEW W
• Application Number:
  US09/947,244
• Publication Number:
  US 20030045293A1
• Time in Patent Office: 1,280 Days
• Field of Search: 455/442, 455/437, 455/436, 455/422.1, 455/67.11, 455/550.1, 370/331, 370/332, 370/333, 370/334
• US Class Current: 455/442
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection

Abstract

A Virtual Soft Handover (VSHO) process for high data rate (HDR) applications is disclosed that considers the total number packets remaining to be transmitted prior to initiating the VSHO. An HDR mobile terminal maintains data transmission information relating to an amount of data to be transmitted during a data transfer in progress during a data session. The data transmission information may include, for example, the total packet size of a data transmission and the data transmission status (i.e., the number of packets remaining to be transmitted). The decision of whether to perform a VSHO is made according to the data transmission information. In one embodiment, a VSHO may be deactivated when the number of packets remaining to be transmitted is less than a certain threshold. In other embodiments, a VSHO may not be performed if the total packet size is smaller than a certain threshold.

Claims

1. A high data rate mobile terminal in wireless communication with a high data rate telecommunications network wherein said mobile terminal is in wireless communication with a first sector of said high data rate telecommunications network to establish a data session, comprising:

an application agent for determining data transmission information relating to an amount of data remaining to be transmitted from said mobile terminal to said telecommunications network during a data transfer in progress during said data session;

means for determining whether to perform a virtual soft handover from the first sector to a second sector, said means for determining further comprising;

measurement logic adapted to measure radio information indicating the radio channel conditions for at least said first sector and said second sector,

handover logic adapted to determine whether a second radio channel condition associated with said second sector is better than a first radio channel condition associated with said first sector;

in response to said determination that said second radio channel condition is better than said first radio channel condition,

said handover logic further adapted to determine whether to perform said virtual soft handover from said first sector to said second sector based on said data transmission information.

2. The mobile terminal of claim 1, wherein said means for determining further comprises:

means for storing at least one threshold information, said handover logic being further adapted to compare said data transmission information to said at least one threshold information to determine whether to perform said handover.

3. The mobile terminal of claim 2, wherein said at least one threshold information includes a total data length threshold value, said data transmission information including at least a total data length of said data transfer, said handover logic being further adapted to decide to not perform said handover when said total data length of said data transfer is less than said total data length threshold value.

4. The mobile terminal of claim 2, wherein said data transmission information including at least a data transmission status, said handover logic being further adapted to decide to not perform said handover when said data transmission status is less than said threshold information.

5. The mobile terminal of claim 4, wherein said data transmission status includes the number of data packets remaining to be transmitted from said mobile terminal.

6. A high data rate telecommunications network, including:

first and second sectors each providing high data rate radio coverage, comprising;

a high data rate mobile terminal in wireless communication with said first by establishing a data session within said first sector for performing data transfer between said mobile terminal and said high data rate telecommunications network, said high data rate mobile terminal comprising means for performing a virtual soft handover from said first sector to said second sector, further comprising;

means for measuring radio information indicating the radio channel conditions for at least said first sector and said second sector and determining whether said radio channel condition for said sector is better than the first sector;

application agent for determining data transmission information relating to an amount of data remaining to be transmitted from said mobile terminal to said telecommunications network for said particular data session; and

in response to said determination that said sector is better, means for determining to perform said virtual soft handover to said sector further based on said data transmission information.

7. The network of claim 6, wherein said mobile terminal comprises means for storing threshold information including at least one threshold stored therein, said mobile terminal being further adapted to compare said data transmission information to said at least one threshold to determine whether to perform said handover.

8. The network of claim 7, wherein said at least one threshold includes a total data length threshold, said data transmission information including at least a total data length of said data transfer, said mobile terminal being further adapted to decide to not perform said handover when said total data length of said data transfer is less than said total data length threshold.

9. The network of claim 7, wherein said data transmission information including at least a data transmission status, said mobile terminal being further adapted to decide to not perform said handover when said data transmission status is less than said threshold.

10. A method for determining whether a high data rate mobile terminal in wireless communication with a first sector of a high data rate telecommunications network should perform a handover of a data session to a second sector within said high data rate telecommunications network, comprising:

measuring radio information indicating the radio channel conditions for at least said first sector and said second sector; and

in response to a determination that said radio channel conditions recommends a virtual software handover from said first sector to said second sector;

determining data transmission information relating to an amount of data remaining to be transmitted from said mobile terminal to said telecommunications network during a data transfer in progress during said data session; and

determining whether said handover of said data session should be performed to said second sector of said high data rate telecommunications network based on said data transmission information.

11. The method of claim 10, wherein said step of determining further comprises:

comparing said data transmission information to at least one threshold to determine whether to perform said handover.

12. The method of claim 11, wherein said at least one threshold includes a total data length threshold and said data transmission information includes at least a total data length of said data transfer, and wherein said step of determining further comprises:

not performing said handover when said total date length of said data transfer is less than said total data length threshold.

13. The network of claim 11, wherein said data transmission information includes at least a data transmission status, and wherein said step of determining further comprises:

not performing said handover when said data transmission status is less than said threshold.

14. The method of claim 10, wherein said step of determining further comprises:

receiving data information associated with said data transfer;

determining said data transmission information using said data information.

15. The method of claim 14, wherein said data information includes the number of data packets received with each transmission of said data transfer.

16. The method of claim 15, wherein said data information further includes a total data length of said data transfer end wherein said step of determining said data transmission information further comprises:

initializing a counter with said total data length; and

decrementing said counter with each said data information received.