Title:
移動ストリーミングメディアシステムにおいて無線基地局間でストリーミングメディアセッションをハンドオフする方法
Document Type and Number:
Japanese Patent JP4713831
Kind Code:
B2
Abstract:
A method for performing a soft-handoff in a mobile streaming media system, and a method for performing a hard-handoff in a mobile streaming media system are is disclosed. In the soft-handoff embodiment, the present invention detects that a channel quality between a mobile client and a first base station remains above a drop threshold and that a channel quality between the mobile client and a second base station increases from below to above an add threshold. The present embodiment then sends a first multiple description bitstream from the first base station to the mobile client and sends a complementary second multiple description bitstream from the second base station to the mobile client. This method thereby provides improved utilization of wireless bandwidth during soft-handoffs, in contrast to conventional systems where the same bitstream is transmitted from each base station. In both the cases of soft-handoffs and hard-handoffs, when a mobile client enters a cell whose base station has no free capacity, the base station may prevent call dropping by reducing the number of descriptions being served to the existing clients and thereby providing capacity (at least one description) for the new client. These methods provide improved utilization of wireless bandwidth during soft-handoffs, and reduced probability of service disruption during both soft-handoffs and hard-handoffs.
Inventors:
John Gee Apostropoulous
Sujoy Bus
Gene Chen
Rajendra bear-
Summit Roy
Waitan Tan
Susie Jay Wee
Tina Wong
Bo Shen
Sujoy Bus
Gene Chen
Rajendra bear-
Summit Roy
Waitan Tan
Susie Jay Wee
Tina Wong
Bo Shen
Application Number:
JP2003511581A
Publication Date:
June 29, 2011
Filing Date:
June 26, 2002
Export Citation:
Assignee:
HEWLETT-PACKARD COMPANY
International Classes:
H04J13/00; H04W36/28; H04B7/26; H04L12/56; H04W36/08; H04W36/18; H04W36/30; H04W88/18
Domestic Patent References:
| JP11122321A | ||||
| JP10336040A | ||||
| JP2000341247A | ||||
| JP11239134A | ||||
| JP7298334A |
Attorney, Agent or Firm:
Patent Business Corporation IPS