WO1999021391A2 - Seamless lobe handover - Google Patents
Seamless lobe handover Download PDFInfo
- Publication number
- WO1999021391A2 WO1999021391A2 PCT/SE1998/001891 SE9801891W WO9921391A2 WO 1999021391 A2 WO1999021391 A2 WO 1999021391A2 SE 9801891 W SE9801891 W SE 9801891W WO 9921391 A2 WO9921391 A2 WO 9921391A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- station site
- transmitter
- lobe
- site
- Prior art date
Links
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000004891 communication Methods 0.000 claims abstract description 6
- 102100022102 Histone-lysine N-methyltransferase 2B Human genes 0.000 claims description 3
- 101001045848 Homo sapiens Histone-lysine N-methyltransferase 2B Proteins 0.000 claims description 3
- 230000011664 signaling Effects 0.000 claims 2
- 230000001702 transmitter Effects 0.000 claims 1
- 230000001413 cellular effect Effects 0.000 abstract description 4
- 238000007493 shaping process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0491—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Definitions
- the present invention relates to a method in a telecommunication system for communication between mobile stations and at least one base station site in said telecommunication system.
- Figure 1 discloses a schematic diagram of a flexible lobe shaping system.
- the antenna array has preferably eight antenna elements.
- Each frequency channel has its own set of weights (e.g. Wj(l) - Wg(l) in Figure 1). The number of these weights is determined by the number of antenna elements used.
- the number of weight sets is determined by the number of simultaneously channels. Each frequency channel has one set of weights and if SDMA (Spatial Division Multiple Access) is used there must be several weight settings for each frequency channel.
- SDMA Spatial Division Multiple Access
- the object of this invention is to avoid the changing of channel when hand- over is carried out in for example the above mentioned fixed lobe-shaping system. Another object of the invention is to avoid the changing of receiver/transmitter equipment in the base station site.
- Figure 1 is a flexible lobe-shaping system
- Figure 2 is a fixed lobe-shaping system according to the invention
- FIG. 3 is a block diagram of the system in Figure 2;
- Figure 4 discloses adjacent fixed lobes with three excited antenna panels according to the invention
- Figure 5 discloses a base station site with three sectors comprising one lobe each, and with one antenna per sector;
- Figure 6 discloses a base station site according to the invention with three sectors comprising five lobes each, and one antenna array per sector;
- Figure 7 discloses a base station site according to the invention with three sectors comprising five lobes each, and one antenna array for all sectors;
- Figure 8 discloses a base station site according to the invention with one sector comprising fifteen lobes and one antenna array for said sector;
- Figures 9-12 disclose different structures of the lobe shaping system according to the invention.
- the invention preferably refers to handover between lobes without changing channel. This implies that the mobile terminal can move within a site on the same channel by use of seamless lobe handover.
- the handover is seamless in the meaning that it can not be noted by the mobile user.
- Figure 2 discloses an implementation of the block diagram in Figure 3.
- TRX in Figure 2 corresponds to transmitter and receiver equipment in Figures 3, 9-12.
- LF 1 - LFn and the antennas in Figure 2 correspond to the Antenna array related equipment and the antenna array in Figures 3, 10, 12, respectively.
- the cellular mobile radio system of the invention includes several base station sites and mobile stations (terminals). Each base station site has one or more sectors divided into a number of fixed lobes ( Figures 4-8).
- the base station site comprises base stations with base station transmitter equipment and a base station receiver equipment.
- the mobile station comprises a mobile station receiver and a mobile station transmitter.
- the communication in the cellular mobile radio system between a base station site and a mobile station is achieved by the following steps.
- each base station site uses a number of fixed lobes ( Figures 4- 8) in accordance with Figures 2, 3, 9-12.
- a connection is established between the base station site transmitter/receiver equipment and a mobile station.
- One of the lobes in one of the sectors of the base station site is used for transmission of signals between base station site transmitter/receiver and mobile station transmitter/receiver.
- the base station site continuously measures the signals received from the mobile station. For example the base station site determines the best lobe by comparing the signal received in actual lobe with signal received in alternative lobes. This can be carried out by comparing received signal strength or by comparing received signal to interference ratio in each lobe.
- This comparison between signal strengths etc. in the lobes may imply a handover between the lobes.
- the base station site changes utilized lobe of the base station site to another lobe of the same base station site without changing the serving transmitter and receiver equipment, i.e. the base station site uses the same transmitter/receiver equipment for the new lobe.
- the base station site also changes transmitter/receiver equipment when changing lobe.
- the channel is not changed when changing lobe. It should be realized that with channel we mean frequency, time slot, CDMA-coding etc. It should also be realized that instead of effecting handover between lobes as mentioned above, handover between sectors can also be achieved in the same manner.
- base station site is defined as the covering area of the three sectors, and the base station site includes the three antenna arrays which normally are controlled by three base stations, i.e. one base station for each antenna array.
- handover can be performed between different lobes and different sectors in a base station site.
- a base station site can consist of three different physical antennas, each connected to a base station, wherein handover can be performed between these antennas (base stations).
- base stations This is the case in Figures 5, 11 in which lobe/sector handover is performed changing from sector 1 to sector 2.
- TRX transmitter/receiver equipment controlling sector 1 is changed during handover to another transmitter/re-
- lobe handover between lobes 4 and 5 is either performed within a sector or a lobe/sector handover is performed between sectors 6 and 1, wherein handover is performed from lobe 8 in sector 6 to lobe 9 in sector 7.
- the same TRX equipment is used and the same or changed channel can be used.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EA200000434A EA002245B1 (en) | 1997-10-20 | 1998-10-20 | Seamless lobe handover |
AU96591/98A AU9659198A (en) | 1997-10-20 | 1998-10-20 | Seamless lobe handover |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9703823A SE9703823D0 (en) | 1997-10-20 | 1997-10-20 | Method for seamless lobe shifting and interference cancellation |
SE9703823-6 | 1997-10-20 | ||
SE9703822A SE9703822D0 (en) | 1997-10-20 | 1997-10-20 | Seamless lobe handover |
SE9703822-8 | 1997-10-20 | ||
SE9800869-1 | 1998-03-17 | ||
SE9800869A SE515862C2 (en) | 1997-10-20 | 1998-03-17 | Matchless lobe handover |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999021391A2 true WO1999021391A2 (en) | 1999-04-29 |
WO1999021391A3 WO1999021391A3 (en) | 1999-06-24 |
Family
ID=27355893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1998/001891 WO1999021391A2 (en) | 1997-10-20 | 1998-10-20 | Seamless lobe handover |
Country Status (5)
Country | Link |
---|---|
CN (1) | CN1281622A (en) |
AU (1) | AU9659198A (en) |
EA (1) | EA002245B1 (en) |
SE (1) | SE515862C2 (en) |
WO (1) | WO1999021391A2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003052969A1 (en) * | 2001-12-17 | 2003-06-26 | The Boeing Company | Method for phased array antenna signal handoff |
WO2004042983A2 (en) * | 2002-11-04 | 2004-05-21 | Vivato, Inc. | Forced beam switching in wireless communication systems having smart antennas |
WO2006113009A1 (en) * | 2005-04-18 | 2006-10-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Flexible multi-sector multiple antenna system |
CN100391174C (en) * | 2000-08-11 | 2008-05-28 | 里费杰公司 | Enabling seamless user mobility in short-range wireless networking environment |
US8289939B2 (en) | 2002-11-04 | 2012-10-16 | Xr Communications Llc | Signal communication coordination |
US8412106B2 (en) | 2002-11-04 | 2013-04-02 | Xr Communications, Llc | Directed wireless communication |
US9031519B2 (en) | 2010-06-11 | 2015-05-12 | Telefonaktiebolaget L M Ericsson (Publ) | Node in a communication system with switchable antenna functions |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5109528A (en) * | 1988-06-14 | 1992-04-28 | Telefonaktiebolaget L M Ericsson | Handover method for mobile radio system |
WO1996000484A1 (en) * | 1994-06-23 | 1996-01-04 | Telefonaktiebolaget Lm Ericsson | Intra-cell handover with antenna arrays |
US5732359A (en) * | 1994-05-13 | 1998-03-24 | Westinghouse Electric Corporation | Mobile terminal apparatus and method having network inter-operability |
-
1998
- 1998-03-17 SE SE9800869A patent/SE515862C2/en not_active IP Right Cessation
- 1998-10-20 WO PCT/SE1998/001891 patent/WO1999021391A2/en active Application Filing
- 1998-10-20 EA EA200000434A patent/EA002245B1/en not_active IP Right Cessation
- 1998-10-20 CN CN98811543A patent/CN1281622A/en active Pending
- 1998-10-20 AU AU96591/98A patent/AU9659198A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5109528A (en) * | 1988-06-14 | 1992-04-28 | Telefonaktiebolaget L M Ericsson | Handover method for mobile radio system |
US5732359A (en) * | 1994-05-13 | 1998-03-24 | Westinghouse Electric Corporation | Mobile terminal apparatus and method having network inter-operability |
WO1996000484A1 (en) * | 1994-06-23 | 1996-01-04 | Telefonaktiebolaget Lm Ericsson | Intra-cell handover with antenna arrays |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100391174C (en) * | 2000-08-11 | 2008-05-28 | 里费杰公司 | Enabling seamless user mobility in short-range wireless networking environment |
CN100352182C (en) * | 2001-12-17 | 2007-11-28 | 波音公司 | Method for phased array antenna signal handoff |
US6628235B2 (en) | 2001-12-17 | 2003-09-30 | The Boeing Company | Method for phased array antenna signal handoff |
WO2003052969A1 (en) * | 2001-12-17 | 2003-06-26 | The Boeing Company | Method for phased array antenna signal handoff |
US7729728B2 (en) | 2002-11-04 | 2010-06-01 | Xr Communications, Llc | Forced beam switching in wireless communication systems having smart antennas |
US8412106B2 (en) | 2002-11-04 | 2013-04-02 | Xr Communications, Llc | Directed wireless communication |
US7062296B2 (en) | 2002-11-04 | 2006-06-13 | Vivato, Inc. | Forced beam switching in wireless communication systems having smart antennas |
WO2004042983A3 (en) * | 2002-11-04 | 2004-06-10 | Vivato Inc | Forced beam switching in wireless communication systems having smart antennas |
WO2004042983A2 (en) * | 2002-11-04 | 2004-05-21 | Vivato, Inc. | Forced beam switching in wireless communication systems having smart antennas |
US11777569B2 (en) | 2002-11-04 | 2023-10-03 | Xr Communications Llc | Directed wireless communication |
US8289939B2 (en) | 2002-11-04 | 2012-10-16 | Xr Communications Llc | Signal communication coordination |
US10715235B2 (en) | 2002-11-04 | 2020-07-14 | Xr Communications, Llc | Directed wireless communication |
US10594376B2 (en) | 2002-11-04 | 2020-03-17 | Xr Communications, Llc | Directed wireless communication |
US9462589B2 (en) | 2002-11-04 | 2016-10-04 | Xr Communications, Llc | Directed wireless communication |
US10009085B2 (en) | 2002-11-04 | 2018-06-26 | Xr Communications, Llc | Directed wireless communication |
WO2006113009A1 (en) * | 2005-04-18 | 2006-10-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Flexible multi-sector multiple antenna system |
CN101160746B (en) * | 2005-04-18 | 2011-10-19 | 艾利森电话股份有限公司 | Flexible multi-sector multiple antenna system |
US9654198B2 (en) | 2010-06-11 | 2017-05-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Node in a communication system with switchable antenna functions |
US9031519B2 (en) | 2010-06-11 | 2015-05-12 | Telefonaktiebolaget L M Ericsson (Publ) | Node in a communication system with switchable antenna functions |
Also Published As
Publication number | Publication date |
---|---|
SE9800869L (en) | 1999-04-21 |
SE9800869D0 (en) | 1998-03-17 |
AU9659198A (en) | 1999-05-10 |
CN1281622A (en) | 2001-01-24 |
EA002245B1 (en) | 2002-02-28 |
EA200000434A1 (en) | 2000-12-25 |
SE515862C2 (en) | 2001-10-22 |
WO1999021391A3 (en) | 1999-06-24 |
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