WO1996038997B1 - Mobile assisted handover arrangements for digital cellular telephone networks - Google Patents
Mobile assisted handover arrangements for digital cellular telephone networksInfo
- Publication number
- WO1996038997B1 WO1996038997B1 PCT/GB1996/001280 GB9601280W WO9638997B1 WO 1996038997 B1 WO1996038997 B1 WO 1996038997B1 GB 9601280 W GB9601280 W GB 9601280W WO 9638997 B1 WO9638997 B1 WO 9638997B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base stations
- base station
- downlink
- handover
- mobile telephone
- Prior art date
Links
- 230000001413 cellular effect Effects 0.000 title claims abstract 5
- 238000005259 measurement Methods 0.000 claims 4
- 230000005540 biological transmission Effects 0.000 claims 1
Abstract
A digital cellular telephone network is provided with mobile telephone handover arrangements in which a mobile telephone supplies signals relating to the strengths of downlink signals. The signals are the signals from a first base station, with which the telephone is communicating, as well as downlink signals from other selected base stations in the network. Based on this information a central controller calculates a carrier-to-interference ratio C/I and determines when and to which other base station the mobile telephone should be handed over to.
Claims
1. A handover arrangement for a digital cellular telephone network having a central controller and a number of mobile telephones, in which each telephone is arranged to continually measure and transmit downlink signal strength of a first base station and downlink signal strength measurements of a number of other selected base stations, and in which these signals are passed to the central controller which determines a C/I ratio and initiates a handover of the mobile telephone from the first base station to another base station whenever this ratio falls below a predetermined value, where C equals the downlink signal strength of the firεt base station and I is a summation of the downlink signal strengths of the other base stations.
2. A handover arrangement for a digital cellular telephone network having a central controller and a number of mobile telephones, in which each telephone is arranged to continually measure and transmit downlink signal strength of a first base station and downlink signal strength measurements of a number of other selected base stations, and in which these signals are passed to the central controller which determines a C/I ratio and initiates a handover of the mobile telephone from the first base station to another base station whenever this ratio falls below a predetermined value provided the C/I ratio for the other base station is above the predetermined value, where C equals the downlink signal strength of potential handover target base station and I is a summation of the downlink strengths of the other selected base stations.
3. A handover arrangement according to claim 1 or 2, in which the downlink strengths are measured on control channels of the network.
4. A handover arrangement according to claim 2 or 3, in which the selected base stations comprise the base stations which are the nearest other base stations in the network having the same traffic channel frequency.
5. A handover arrangement according to claim 2 or 3, in which the selected base stations are preselected other base stations geographically associated with the potential handover target base station.
6. A handover arrangement according to any one of claims 1 to 5, in which the downlink strengths of the base stations are modified before being summated by selected quotients or scaling factors relating to previous calculations or measurements of the network.
7. A handover arrangement according to any one of claims 1 to 6, in which the first base station is arranged to serve a special area of the network and two or more other remotely located base stations in the system are selected to identify a mobile telephone in that special area, in which the mobile telephone is arranged to measure the downlink strength of signals from the two or more selected base stations and communicate the signal strengths to the first base station for onward transmission to the central controller.
8. A mobile telephone for a digital cellular telephone network according to any one of claims 1 to 7, including means for continuously periodically measuring the strength of downlink signals received from a first base station and the strengths of downlink signals received from a number of other base stations, and means for transmitting these measurements to the first base station.
9. A mobile telephone according to claim 8, in which the measuring means is arranged to measure the strength of downlink signals from the surrounding base stations operating at the same carrier frequency.
10. A mobile telephone according to claim 8 or 9, in which the measuring means is arranged to measure the strength of downlink signals from the immediately surrounding base stations operating at different carrier frequencies.
11. A mobile telephone according to any one of claims 8 to 10, in which the measuring means is arranged to measure the strength of downlink signals from selected two or more geographically remotely positioned base stations.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU58290/96A AU701840B2 (en) | 1995-05-30 | 1996-05-30 | Mobile assisted handover arrangements for digital cellular telephone networks |
| EP96919926A EP0829179A1 (en) | 1995-05-30 | 1996-05-30 | Mobile assisted handover arrangements for digital cellular telephone networks |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9510861.9A GB9510861D0 (en) | 1995-05-30 | 1995-05-30 | Handover arrangements for digital cellular telephone networks |
| GB9510861.9 | 1995-05-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1996038997A1 WO1996038997A1 (en) | 1996-12-05 |
| WO1996038997B1 true WO1996038997B1 (en) | 1997-01-23 |
Family
ID=10775214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1996/001280 WO1996038997A1 (en) | 1995-05-30 | 1996-05-30 | Mobile assisted handover arrangements for digital cellular telephone networks |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0829179A1 (en) |
| CN (1) | CN1085031C (en) |
| AU (1) | AU701840B2 (en) |
| GB (1) | GB9510861D0 (en) |
| WO (1) | WO1996038997A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970407A (en) * | 1996-12-31 | 1999-10-19 | Telefonaktiebolaget L M Ericsson (Publ) | Compensation for mobile assisted handoff measurement inaccuracies |
| FI104682B (en) | 1997-02-18 | 2000-04-14 | Nokia Networks Oy | Handover in a mobile communication system |
| FI104683B (en) | 1997-02-18 | 2000-04-14 | Nokia Networks Oy | Handover in a mobile communication system |
| FR2768584B1 (en) * | 1997-09-12 | 1999-12-03 | Nortel Matra Cellular | DEVICE FOR ALLOCATING RESOURCES IN A RADIO COMMUNICATION NETWORK |
| FR2768586B1 (en) * | 1997-09-12 | 1999-12-03 | Nortel Matra Cellular | PROVISIONAL ESTIMATE OF THE INTERFERENCE SIGNAL RATIO IN A CELLULAR RADIOCOMMUNICATION NETWORK |
| FI106287B (en) | 1997-09-17 | 2000-12-29 | Nokia Mobile Phones Ltd | Improved procedure for changing base station |
| US6259918B1 (en) | 1999-02-26 | 2001-07-10 | Telefonaktiebolaget Lm (Publ) | Preservation of cell borders at hand-off within a smart antenna cellular system |
| ATE379939T1 (en) * | 1999-08-10 | 2007-12-15 | Motorola Inc | METHODS TO REDUCE INTERFERENCE BETWEEN MOBILE PHONES USING DIFFERENT DUPLEX TECHNOLOGY |
| GB2362297B (en) * | 2000-01-07 | 2003-10-15 | Motorola Inc | Method and apparatus for location based consideration for cellular telephone handoff |
| US7142860B2 (en) | 2001-03-30 | 2006-11-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Network/cell/interface selection in mixed networks |
| US7068626B2 (en) * | 2001-08-16 | 2006-06-27 | Interdigital Technology Corporation | Method of using a mobile unit to autonomously determine a serving cell |
| JP4762033B2 (en) | 2006-04-07 | 2011-08-31 | 株式会社エヌ・ティ・ティ・ドコモ | Measuring apparatus and area quality measuring method |
| CN101466097B (en) * | 2007-12-17 | 2011-03-16 | 中兴通讯股份有限公司 | Method for providing continuous high speed access for mobile terminal |
| CN102083159A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团北京有限公司 | Switching controlling method in mobile communication system and wireless network controller |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866710A (en) * | 1988-02-22 | 1989-09-12 | Motorola, Inc. | Reuse groups for scan monitoring in digital cellular systems |
| US5042082A (en) * | 1989-06-26 | 1991-08-20 | Telefonaktiebolaget L. M. Ericsson | Mobile assisted handoff |
| BR9205834A (en) * | 1991-04-01 | 1994-06-28 | Motorola Inc | Radiotelephony system, and verification process of a target channel. |
-
1995
- 1995-05-30 GB GBGB9510861.9A patent/GB9510861D0/en active Pending
-
1996
- 1996-05-30 CN CN96195681A patent/CN1085031C/en not_active Expired - Fee Related
- 1996-05-30 WO PCT/GB1996/001280 patent/WO1996038997A1/en not_active Application Discontinuation
- 1996-05-30 AU AU58290/96A patent/AU701840B2/en not_active Ceased
- 1996-05-30 EP EP96919926A patent/EP0829179A1/en not_active Withdrawn
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