Transcript
USOO8804657B2
(12) United States Patent
(10) Patent N0.:
Roberts et a]. (54)
(75)
(45) Date of Patent:
METHOD AND APPARATUS FOR
2002/0197992 A1*
TRANSITIONING FROMA FIRST RAT TO A
2004/0116110 A1 *
SECOND RAT
2005/0288017 A1
Inventors: Gideon Roberts, Surrey (GB); Sukhdev
saini Surrey (GB) ’
(73)
Assignee: BlackBerry Limited, Waterloo, Ontario
Notice:
(22) Filed: (65)
12/2002 Nini et a1. .................. .. 455/435
6/2004 Amerga et al. 12/2005
Doumenc et al. ........ .. 455/435.3
2/2006
2006/0088009 A1 *
4/2006 Gibbs et a1. ................. .. 370/338
2007/0173283 A1
7/2007 leet et al.
2007/0207824 A1
9/2007 Bhattacharjee et al.
2008/0014940 A1 *
1/2008 Parron et a1. ................ .. 455/436
Ormson ....... ..
455/436
FOREIGN PATENT DOCUMENTS
Subject to any disclaimer, the term of this patent is extended or adjusted under 35
EP
1509052 A1 *
U.S.C. 154(1)) by 646 days.
EP
1610584 A1
12/2005
WO
0103459 A1
1/2001
(21) App1.No.: 12/463,124 .
Aug. 12, 2014
2006/0025137 A1 *
(CA) (*)
US 8,804,657 B2
2/2005
,,,,,,,,,,,,, ,, H04Q 7/33
OTHER PUBLICATIONS
May 8, 2009 Prior Publication Data
3GPP TS 25.304 v.8.1.0; 3rd Generation Partnership Project; Tech
nical Speci?cation Group Radio Access Network; User Equipment (UE) Procedures in Idle Mode and Procedures for Cell Reselection in Connected Mode; Release 8; Mar. 2008; 41 pgs.
Us 2009/0286542 A1 NOV 19, 2009 Related U 5 Application Data
EPO Search and Examination Report; EP Application No. 09159767.
(60)
Provisional application No. 61/052,085, ?led on May 9, 2008.
(51)
Int. Cl.
4; JUL 31, 2009; 8 pg$~ * cited by examiner
H04W4/00
H04W36/00 (52) US. C].
(200901)
Primary Examiner * San Htun
(200901)
(74) AllorneyAgenl, orFirm * Conley Rose, PC; J. Robert Brown’ 1L
USPC .......................... .. 370/331; 370/332; 455/436
(58)
Field of Classi?cation Search
(57)
USPC .............. .. 455/435.1*435.3, 4364444, 550.1,
455/552'11555551585532; 3;?243321
370/436i44'4’ 550'1 552'1’ 553'1 556'1’
3’70/5'56’ 2 3'16 3513356 0’ ’
A method, in a Wireless communications device having a ?rst
protocol stack for use With a ?rst radio access technology and
455/418i422 1_ 3’70/31’0 2 ’328 '338 33'1’ 370/422 ’432 1i43'2’3 43’5 1455 3’ ' ’
ABSTRACT
’
a second protocol stack for use vvith a second radio access technology, the method for transitioning from a ?rst radio
access technology to a second radio access technology, the
method comprising: maintaining a 11st of available commu
nication ce11s associated With the second radio access tech
see apphcanon ?le for complete searCh hlswry'
nology, and transferring information associated With more
References Cited
than one available communication ce11 associated With the second radio access technology from the ?rst protocol stack to the second protocol stack.
(56)
U_g_ PATENT DOCUMENTS 7,197,312 B2 *
3/2007 Gunaratnam et al. ...... .. 455/445
11 Claims, 4 Drawing Sheets
112
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Sheet 1 0f 4
US 8,804,657 B2
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Sheet 2 0f 4
US 8,804,657 B2
201
202
Maintain List of available UMTS cells
l _
203
Identify tranSItion from GPRS to UMTS required
l 204
Transfer List of available UNITS cells from GPRS protocol stack to
UMTS protocol stack
Attempt to connect to a 205
first listed available UMTS cell
Attempt Successful?
Attempt to connect 207 to further listed
available UMTS cell
Fig. 2
——
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Sheet 3 0f4
US 8,804,657 B2
301
3 O2
Maintain List of available GPRS cells
T 303
identify transition from UMTS to GPRS required
i 304
Transfer List of available GPRS cells from UMTS protocol stack to
GPRS protocol stack l'
Attempt to connect to a 305
first listed available GPRS cell
Attempt Successful?
Attempt to connect 307 to further listed available GPRS cell
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US 8,804,657 B2
Sheet40f4
5E§
