The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 2012
Filed:
May. 05, 2011
Method and system for a reliable relay-associated and opportunistic cooperative transmission schemes
Dandan Wang, Richardson, TX (US);
Chia-chin Chong, Santa Clara, CA (US);
Ismail Guvenc, Santa Clara, CA (US);
Fujio Watanabe, Union City, CA (US);
Dandan Wang, Richardson, TX (US);
Chia-Chin Chong, Santa Clara, CA (US);
Ismail Guvenc, Santa Clara, CA (US);
Fujio Watanabe, Union City, CA (US);
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A cooperative communication scheme is provided for a base station (BS) to communicate with a mobile station (MS) through a group of relay stations (RSs). The RSs, collectively referred to as a relay-associated group of RSs (R-group), serve the same target MS. The R-group may be formed during initial ranging or during periodical ranging of the MSs, according to the channel conditions between the MSs and the RSs. A reliable relay-associated transmission scheme provides fast recovery and reduces the burden on the BS. In one exemplary scheme, the BS transmits data to the R-group. To ensure that reliable transmission exists between the BS and the R-group, the BS initially sends the information to all the RSs in the R-group using multicast or unicast mode. In one embodiment, after receiving the packets from the BS, each RS in the R-group calculates its reliability value according to a reliability function which may depend on (a) the channel conditions between the BS and the RSs, (b) the channel conditions between the RSs and the MS, and (c) the load status at the RSs. The RSs then feedback their reliability values in a message ('relay-associated acknowledgement message' or R-ACK).