CA2096219A1 - Communication transfer between unlike communication domains - Google Patents
Communication transfer between unlike communication domainsInfo
- Publication number
- CA2096219A1 CA2096219A1 CA002096219A CA2096219A CA2096219A1 CA 2096219 A1 CA2096219 A1 CA 2096219A1 CA 002096219 A CA002096219 A CA 002096219A CA 2096219 A CA2096219 A CA 2096219A CA 2096219 A1 CA2096219 A1 CA 2096219A1
- Authority
- CA
- Canada
- Prior art keywords
- communication
- domain
- subscriber unit
- domains
- coverage area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004891 communication Methods 0.000 title claims abstract description 99
- 238000012546 transfer Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 2
- 230000007704 transition Effects 0.000 abstract description 19
- 230000001413 cellular effect Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
- H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A communication system transfers communication from one communication domain (analog) (105) to another, unlike communication domain (digital). The communication system uses a transition cell having both analog and digital coverage areas overlapping in a 1:1 RF
footprint. The transition cell is partitioned into sectors, each sector marked with either an analog or digital domain indication. When a subscriber unit (100) enters the transition cell from one domain, an inter-cell handoff into the transition cell within the same domain is performed. When the subscriber unit enters a sector having an opposite domain indication, an intra-cell handoff is performed. If the subscriber unit (100) then moves out of the transition cell, an inter-cell handoff into the new domain is performed.
footprint. The transition cell is partitioned into sectors, each sector marked with either an analog or digital domain indication. When a subscriber unit (100) enters the transition cell from one domain, an inter-cell handoff into the transition cell within the same domain is performed. When the subscriber unit enters a sector having an opposite domain indication, an intra-cell handoff is performed. If the subscriber unit (100) then moves out of the transition cell, an inter-cell handoff into the new domain is performed.
Description
wo 93/06683 PCr/US92/~6997 2~9~2~
CO~ICATIO~ TRANS~ l~El'W~J
UNLI~ COMMLI~C~TION Dl~MA~S
Field of the Invention This invention relates generally to communications systems, and more particularly to maintenance of 10 communication within unlike communication domains.
Background of the Invention 15 As digital cellular radiotelephone technology matures, it becomes ever more necessary to combine digital and analog coverage areas in cellular radiotelephone communication domains. Subscriber units developed to accommodate both digital and analog modulation tschniques, i.e., dual-mode 2 0 subscriber units, will reqllire handoff of commlmication between the digital communication domains and analog communication domains, and vice versa.
Problems occur, however, when the handoff between digital and analog domain is attempted, primarily at the 2 5 boundary between the analog and digital coverage areas. When a dual-~node subscriber unit is operating in the digital domain, a potential analog target cell base-station cannot measure the subscriber units signal strength due to incompatibility. The same is true when the subscriber unit is operating in an analog 3 0 cell; the digital base-stations cannot measure the subscriber units signal strength. (~onsequently, potential target base-stations in the other domain cannot measure the subsc~iber SUBST'TUTE SHIEET
WO 93/066~3 2 o ~ 6 2 1 9 P~/US92/069g7 units signal strength and thus cannot be included in a viable target candidate by a controlling switch.
One potential solution to the problem may be to provide digital scanning equipment at border analog cells and analog 5 scanning equipment at border digital cells to provide the required scanning functions in the adjacent domains. The coITesponding scanning equipment would have the capability to monitor the signal strength of $he mobile to which it is in the same domain, and provide information back to a controlling 1 0 switch for handoff purposes. However, the use of scanning equipment as opposed to voice-type base-station equipment increases the cost and comple~ity of the overall system while reducing the versatility and throughput of the system.
Thus, a need exists for a comrllunication system which 15 controls the transfer of communication of a dual-mode subscriber unit between digital and analog comn~unication domains without requiring dedicated scan receivers.
S~ mary of the Invention A communication system transfers communication between unlike communication domains. The communication system communicates to a subscriber unit in a first 2 5 comrnunication domain and transfers communication of the subscriber unit from the first communication domain to a second communication domain when a subscriber unit enters the second communication domain.
`S'J~TiT~T ~E~T
WO 93/06683PCr/US92/06997 2a9~9 Brief Description of the Drawings FIG. 1 generally depicts a cellular topology which may beneficially employ the present invention.
5FIG. 2 generally depicts transition cells which perfo~n communication transfer between unlike communication domains in accordance with the invention 10Detailed Description of a Preferr0d Embodiment FIG. 1 generally depicts a typical cellular topology which could accommodate communication transfer between unlike communication domains ~i.e., digital and analog) in accordance 1 5 with the invention. The cells of FIG. 1 are depicted having an "A" for Analog only cells, "A/D" for analog and digital composite transition cells, and a "D" representing a digital-only cell. In the preferred embodiment, the transition cell would be two 60 sertor/sector cells; one a~alog cell and one digital cell overlaying 2 0 each other with a 1:1 RF footprint. Each sector of each transition cell is assigned either an analog domain indication (IA) or a digital domain indication (ID)~ depending on the domain of the adjacent cell. The domain indications IA7 ID are used as flags to signal base-stations within transition cells when a domain 2 5 transfer is required.
FIG. ~ depicts a sub-section 106 of FIG. 1 having analog and digital base-stations connected to a switch 220 in accordance with the invention. In the preferred embodiment, all the cells shown in FIG. 2 as well as the cells shown in FIG. 1 are 3 0 connected to a switch. In addition, more than one switch can be implemented in a particular coverage area; the number of switches are typically dependant on the nl~mber of subscribers within the particular coverage area. (~ontinuing, the switch 220 S~l BSTI T IJT SH EET
W O 93/06683 ~ ~ 9 6 ~ ~ 9 PC~r/US92/069~7 can be an EMX switch available from Motorola, Inc. and described in Motorola Instruction :Manual No. 68P81054E59 published by Motorola Service Publications, Schaumburg, IL.
The analog base-stations 200-204 shown may employ 5 transmitters and receivers of the type described in Motorola Instruction Manual No. 68P81058:E32-A published by Motorola Service Publications, Schaumburg, IL., in 1989. All analog cells "A" and transition cells "A/D" of FIG. 1 employ analog base-stations, although only several are shown for clarity in FIG. 2.
1 0 The digital base-stations 210-212 shown could be of the type used in digital cellular systems such as, inter alia, the United States Digital Cellular System ~USDC) defined in EIA/TIA, Project Number 2215 titled "Dual-Mode Mobile S~ation - Base-station Çom~2~ati~ilitv Standar~" dated December 1989 and the Japan 1 5 Digital Cellular Standard (JDC~ defined by the Research and DevelQpment Center for Radio ~ystems in Ja~ dated January 1991. Both of these digital systems use mobile assisted handof~ (MAHO) to aid inter-cell handoff in the digital-only cells "D" and intra-cell digital handoff in the transition cells "AID".
2 0 As with the analog cells, all the digital cells "D" and transition cells "AlD" of FIG. 1 employ digital base-stations, although only several are shown for clarity in FIG. 2. Still another digital system which could be implemented in accordance with the invention is a code-division multiple access (CDMA) digital 2 5 system.
If a dual-mode subscriber unit 100 (i.e., a subscriber unit having both analog and digital commllnication capability) is travelling throughout analog-only cells "A", analog-only handof~
techniques are employed. Referring to FIG. 2, the subscriber 3 0 unit 100 is communicating to analog base-station 200 in analog cell A20o. If the subscriber unit 100 enters transition cell A/D202/212, the subscriber unit 100 will undergo an inter-cell handoff from analog base-station 200 of cell A200 to analog base-SUE~ l~i i ~ I E SHEE~T
wo 93/06683 PCI`/US92/069~7 209~219 station 202 of cell A/D202/212 via the switch 220 using con~entionalanalog handoff techniques. As long as the subscriber unit 100 is assigned to an analog channel in a sector having an analog domain indication IA, the subscriber unit 100 will maintain 5 communication wit,h analog base-station 202. When the subscriber l1nit 100 assigned to an analog channel moves into a sector of transition cell A/D202/212 having a digital domain indication ID~ analog base-station 202 will attempt an intra-cell handoff to a digital channel in the samé sector. The analog base-1 0 station 202 will send a handoffrequest (HOR) to the switch 220, at which time the switch 220 will request the digital base-station 210 to make a signal strength measuremPnt of the subscriber unit 100 in the same sector. If the signal strength is adequate, the subsc~ber unit 100 is handed ofE to an available digital channel 1 5 used by digital base-station 210. If the subscriber unit 210 now moves into the digital-only cells "D", typical digital handoff techniques are employed to perform inter-cell digital handoffs.
The procedure for commuIlication transfer between the two domains is reversed when the subscriber unit 100 travels fror~
2 0 the digital domain to the analog domain.
In an alternate embodiment, a method for transitioning between domains without using sector information is also envisioned. A subscriber unit 100 would use normaI analog or digital handof~s to be handed off into a transition cell A/D. Once 2 5 in the transition cell, the subscriber unit 100 would use normal intra-cell handoffs to move between sectors; an intra-cell handoff between domains would not be performed as long as an inter-cell handoff is required. When a inter-cell handoffis required, the base-station (analog or digital) in communication with the 3 0 subscriber unit 100 would request a signal quality value measurement (a signal strength measurement in the preferred embodiment) from all target cells in the domain the subscriber unit 100 was in. In t~e preferred embodiment, a target cell in SUB9i 1 I-rUTE ~IEET
~ ,.
wo 93/06683 ;, Pcr/US92/06~97 2 ~ } ~;? i~
the same domain is a neighboling cell in the same domain. If no target cells are acceptable, the switch 220 would report this back to the base-station in communica$ion with the subscriber 100. At this point, an intra-cell handoffwould be initiated to 5 chaIlge domains. The base-station in the new domain now in communication with the subscriber 100 would attempt to perform an inter-cell handof~ into a cell of the new domain.
With this inventive technique, a single transition cell can support bi-directional transitions from one domain without 10 providing scan receivers as potential target cells in the other domain. The invention eliminates the need for dedicated scanning receivers on the border of the domains, thus increasing system versatility and throughput.
What I claim is:
SUG~Ti~BTE S~ T
CO~ICATIO~ TRANS~ l~El'W~J
UNLI~ COMMLI~C~TION Dl~MA~S
Field of the Invention This invention relates generally to communications systems, and more particularly to maintenance of 10 communication within unlike communication domains.
Background of the Invention 15 As digital cellular radiotelephone technology matures, it becomes ever more necessary to combine digital and analog coverage areas in cellular radiotelephone communication domains. Subscriber units developed to accommodate both digital and analog modulation tschniques, i.e., dual-mode 2 0 subscriber units, will reqllire handoff of commlmication between the digital communication domains and analog communication domains, and vice versa.
Problems occur, however, when the handoff between digital and analog domain is attempted, primarily at the 2 5 boundary between the analog and digital coverage areas. When a dual-~node subscriber unit is operating in the digital domain, a potential analog target cell base-station cannot measure the subscriber units signal strength due to incompatibility. The same is true when the subscriber unit is operating in an analog 3 0 cell; the digital base-stations cannot measure the subscriber units signal strength. (~onsequently, potential target base-stations in the other domain cannot measure the subsc~iber SUBST'TUTE SHIEET
WO 93/066~3 2 o ~ 6 2 1 9 P~/US92/069g7 units signal strength and thus cannot be included in a viable target candidate by a controlling switch.
One potential solution to the problem may be to provide digital scanning equipment at border analog cells and analog 5 scanning equipment at border digital cells to provide the required scanning functions in the adjacent domains. The coITesponding scanning equipment would have the capability to monitor the signal strength of $he mobile to which it is in the same domain, and provide information back to a controlling 1 0 switch for handoff purposes. However, the use of scanning equipment as opposed to voice-type base-station equipment increases the cost and comple~ity of the overall system while reducing the versatility and throughput of the system.
Thus, a need exists for a comrllunication system which 15 controls the transfer of communication of a dual-mode subscriber unit between digital and analog comn~unication domains without requiring dedicated scan receivers.
S~ mary of the Invention A communication system transfers communication between unlike communication domains. The communication system communicates to a subscriber unit in a first 2 5 comrnunication domain and transfers communication of the subscriber unit from the first communication domain to a second communication domain when a subscriber unit enters the second communication domain.
`S'J~TiT~T ~E~T
WO 93/06683PCr/US92/06997 2a9~9 Brief Description of the Drawings FIG. 1 generally depicts a cellular topology which may beneficially employ the present invention.
5FIG. 2 generally depicts transition cells which perfo~n communication transfer between unlike communication domains in accordance with the invention 10Detailed Description of a Preferr0d Embodiment FIG. 1 generally depicts a typical cellular topology which could accommodate communication transfer between unlike communication domains ~i.e., digital and analog) in accordance 1 5 with the invention. The cells of FIG. 1 are depicted having an "A" for Analog only cells, "A/D" for analog and digital composite transition cells, and a "D" representing a digital-only cell. In the preferred embodiment, the transition cell would be two 60 sertor/sector cells; one a~alog cell and one digital cell overlaying 2 0 each other with a 1:1 RF footprint. Each sector of each transition cell is assigned either an analog domain indication (IA) or a digital domain indication (ID)~ depending on the domain of the adjacent cell. The domain indications IA7 ID are used as flags to signal base-stations within transition cells when a domain 2 5 transfer is required.
FIG. ~ depicts a sub-section 106 of FIG. 1 having analog and digital base-stations connected to a switch 220 in accordance with the invention. In the preferred embodiment, all the cells shown in FIG. 2 as well as the cells shown in FIG. 1 are 3 0 connected to a switch. In addition, more than one switch can be implemented in a particular coverage area; the number of switches are typically dependant on the nl~mber of subscribers within the particular coverage area. (~ontinuing, the switch 220 S~l BSTI T IJT SH EET
W O 93/06683 ~ ~ 9 6 ~ ~ 9 PC~r/US92/069~7 can be an EMX switch available from Motorola, Inc. and described in Motorola Instruction :Manual No. 68P81054E59 published by Motorola Service Publications, Schaumburg, IL.
The analog base-stations 200-204 shown may employ 5 transmitters and receivers of the type described in Motorola Instruction Manual No. 68P81058:E32-A published by Motorola Service Publications, Schaumburg, IL., in 1989. All analog cells "A" and transition cells "A/D" of FIG. 1 employ analog base-stations, although only several are shown for clarity in FIG. 2.
1 0 The digital base-stations 210-212 shown could be of the type used in digital cellular systems such as, inter alia, the United States Digital Cellular System ~USDC) defined in EIA/TIA, Project Number 2215 titled "Dual-Mode Mobile S~ation - Base-station Çom~2~ati~ilitv Standar~" dated December 1989 and the Japan 1 5 Digital Cellular Standard (JDC~ defined by the Research and DevelQpment Center for Radio ~ystems in Ja~ dated January 1991. Both of these digital systems use mobile assisted handof~ (MAHO) to aid inter-cell handoff in the digital-only cells "D" and intra-cell digital handoff in the transition cells "AID".
2 0 As with the analog cells, all the digital cells "D" and transition cells "AlD" of FIG. 1 employ digital base-stations, although only several are shown for clarity in FIG. 2. Still another digital system which could be implemented in accordance with the invention is a code-division multiple access (CDMA) digital 2 5 system.
If a dual-mode subscriber unit 100 (i.e., a subscriber unit having both analog and digital commllnication capability) is travelling throughout analog-only cells "A", analog-only handof~
techniques are employed. Referring to FIG. 2, the subscriber 3 0 unit 100 is communicating to analog base-station 200 in analog cell A20o. If the subscriber unit 100 enters transition cell A/D202/212, the subscriber unit 100 will undergo an inter-cell handoff from analog base-station 200 of cell A200 to analog base-SUE~ l~i i ~ I E SHEE~T
wo 93/06683 PCI`/US92/069~7 209~219 station 202 of cell A/D202/212 via the switch 220 using con~entionalanalog handoff techniques. As long as the subscriber unit 100 is assigned to an analog channel in a sector having an analog domain indication IA, the subscriber unit 100 will maintain 5 communication wit,h analog base-station 202. When the subscriber l1nit 100 assigned to an analog channel moves into a sector of transition cell A/D202/212 having a digital domain indication ID~ analog base-station 202 will attempt an intra-cell handoff to a digital channel in the samé sector. The analog base-1 0 station 202 will send a handoffrequest (HOR) to the switch 220, at which time the switch 220 will request the digital base-station 210 to make a signal strength measuremPnt of the subscriber unit 100 in the same sector. If the signal strength is adequate, the subsc~ber unit 100 is handed ofE to an available digital channel 1 5 used by digital base-station 210. If the subscriber unit 210 now moves into the digital-only cells "D", typical digital handoff techniques are employed to perform inter-cell digital handoffs.
The procedure for commuIlication transfer between the two domains is reversed when the subscriber unit 100 travels fror~
2 0 the digital domain to the analog domain.
In an alternate embodiment, a method for transitioning between domains without using sector information is also envisioned. A subscriber unit 100 would use normaI analog or digital handof~s to be handed off into a transition cell A/D. Once 2 5 in the transition cell, the subscriber unit 100 would use normal intra-cell handoffs to move between sectors; an intra-cell handoff between domains would not be performed as long as an inter-cell handoff is required. When a inter-cell handoffis required, the base-station (analog or digital) in communication with the 3 0 subscriber unit 100 would request a signal quality value measurement (a signal strength measurement in the preferred embodiment) from all target cells in the domain the subscriber unit 100 was in. In t~e preferred embodiment, a target cell in SUB9i 1 I-rUTE ~IEET
~ ,.
wo 93/06683 ;, Pcr/US92/06~97 2 ~ } ~;? i~
the same domain is a neighboling cell in the same domain. If no target cells are acceptable, the switch 220 would report this back to the base-station in communica$ion with the subscriber 100. At this point, an intra-cell handoffwould be initiated to 5 chaIlge domains. The base-station in the new domain now in communication with the subscriber 100 would attempt to perform an inter-cell handof~ into a cell of the new domain.
With this inventive technique, a single transition cell can support bi-directional transitions from one domain without 10 providing scan receivers as potential target cells in the other domain. The invention eliminates the need for dedicated scanning receivers on the border of the domains, thus increasing system versatility and throughput.
What I claim is:
SUG~Ti~BTE S~ T
Claims (10)
1. A communication system which transfers communication between unlike communication domains, the communication system comprising:
means for communicating to a subscriber unit in a first communication domain; and means for transferring communication of said subscriber unit from said first communication domain to a second communication domain when said subscriber unit enters said second communication domain.
means for communicating to a subscriber unit in a first communication domain; and means for transferring communication of said subscriber unit from said first communication domain to a second communication domain when said subscriber unit enters said second communication domain.
2. The communication system of claim 1 wherein either of said first and second communication domains further comprise one of either an analog communication domain and a digital communication domain.
3. The communication system of claim 1 wherein one of said first and second communication domains further comprise one of either a time-division multiple access (TDMA) communication system and a code-division multiple access (CDMA) communication system.
4. A communication system which transfers communication between unlike communication domains, the unlike communication domains coupled together via a common interface, the communication system comprising:
means for communicating to a subscriber unit in a first communication domain in a first coverage area;
means for maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area; and means for transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said subscriber unit enters said second communication domain.
means for communicating to a subscriber unit in a first communication domain in a first coverage area;
means for maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area; and means for transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said subscriber unit enters said second communication domain.
5. A communication system which transfers communication between unlike communication domains, the unlike communication domains coupled together via a common interface, the communication system comprising:
means for communicating to a subscriber unit in a first communication domain in a first coverage area;
means for maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area;
means for requesting a plurality of target cells, via the common interface, to measure a signal quality value of said subscriber unit; and means for transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said measured signal quality values are below a predetermined signal quality threshold.
means for communicating to a subscriber unit in a first communication domain in a first coverage area;
means for maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area;
means for requesting a plurality of target cells, via the common interface, to measure a signal quality value of said subscriber unit; and means for transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said measured signal quality values are below a predetermined signal quality threshold.
6. The communication system of claim 5 wherein said second coverage area is a composite of at least said first communication domain and said second communication domain.
7. The communication system of claim 6 wherein said signal quality value is a signal strength value.
8. A method of communication transfer between unlike communication domains, the method comprising the steps of:
communicating to a subscriber unit in a first communication domain; and transferring communication of said subscriber unit from said first communication domain to a second communication domain when said subscriber unit enters said second communication domain.
communicating to a subscriber unit in a first communication domain; and transferring communication of said subscriber unit from said first communication domain to a second communication domain when said subscriber unit enters said second communication domain.
9. A method of communication transfer between unlike communication domains, the unlike communication domains coupled together via a common interface, the method comprising the steps of:
communicating to a subscriber unit in a first communication domain in a first coverage area;
maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area; and transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said subscriber unit enters said second communication domain.
communicating to a subscriber unit in a first communication domain in a first coverage area;
maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area; and transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said subscriber unit enters said second communication domain.
10. A method of communication transfer between unlike communication domains, the unlike communication domains coupled together via a common interface, the method comprising the steps of:
communicating to a subscriber unit in a first communication domain in a first coverage area;
maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area;
requesting a plurality of target cells, via the common interface, to measure a signal quality value of said subscriber unit; and transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said measured signal quality values are below a predetermined signal quality threshold.
communicating to a subscriber unit in a first communication domain in a first coverage area;
maintaining communication to said subscriber unit on said first communication domain as said subscriber unit enters a second coverage area;
requesting a plurality of target cells, via the common interface, to measure a signal quality value of said subscriber unit; and transferring communication of said subscriber unit, via the common interface, from said first communication domain to a second communication domain within said second coverage area when said measured signal quality values are below a predetermined signal quality threshold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76716691A | 1991-09-27 | 1991-09-27 | |
| US07/767,166 | 1991-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2096219A1 true CA2096219A1 (en) | 1993-03-28 |
Family
ID=25078677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002096219A Abandoned CA2096219A1 (en) | 1991-09-27 | 1992-09-21 | Communication transfer between unlike communication domains |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR970000571B1 (en) |
| BR (1) | BR9205474A (en) |
| CA (1) | CA2096219A1 (en) |
| GB (1) | GB2265279A (en) |
| WO (1) | WO1993006683A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI98976C (en) * | 1994-07-11 | 1997-09-10 | Nokia Telecommunications Oy | Method for performing handover and cellular radio system |
| GB2292286B (en) * | 1994-08-06 | 1998-09-09 | Motorola Inc | Radio communications device and method |
| GB2296626B (en) * | 1994-12-23 | 1999-07-28 | Nokia Mobile Phones Ltd | Multi-mode radio telephone |
| FI106671B (en) * | 1995-03-13 | 2001-03-15 | Nokia Mobile Phones Ltd | Mobile telephony, mobile terminal and a method of establishing a connection from a mobile terminal |
| US5680395A (en) * | 1995-08-15 | 1997-10-21 | Qualcomm Incorporated | Method and apparatus for time division duplex pilot signal generation |
| US6047191A (en) * | 1997-02-14 | 2000-04-04 | Telefonaktiebolaget Lm Ericsson | Method of selecting a voice channel in a radio telecommunications network |
| US6771963B1 (en) * | 1998-08-17 | 2004-08-03 | Lucent Technologies Inc. | Triggering handdowns and handoffs of mobile stations between bordering cells of cellular wireless communication systems |
| AU2621699A (en) * | 1999-01-25 | 2000-08-07 | Nokia Networks Oy | Interworking between radio access networks |
| GB0017430D0 (en) * | 2000-07-14 | 2000-08-30 | Ip Access Ltd | Cellular radio telecommunication systems |
| US9173138B2 (en) | 2008-07-07 | 2015-10-27 | Samsung Electronics, Co., Ltd. | Method for handoff during connected mode of a multimode mobile station in mixed deployment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8419003D0 (en) * | 1984-07-25 | 1984-08-30 | Racal Res Ltd | Portable telephones |
| US4799253A (en) * | 1987-07-20 | 1989-01-17 | Motorola, Inc. | Colocated cellular radiotelephone systems |
| US4989230A (en) * | 1988-09-23 | 1991-01-29 | Motorola, Inc. | Cellular cordless telephone |
| US5119397A (en) * | 1990-04-26 | 1992-06-02 | Telefonaktiebolaget L M Ericsson | Combined analog and digital cellular telephone system having a secondary set of control channels |
-
1992
- 1992-09-21 BR BR9205474A patent/BR9205474A/en not_active Application Discontinuation
- 1992-09-21 WO PCT/US1992/006997 patent/WO1993006683A1/en active Application Filing
- 1992-09-21 CA CA002096219A patent/CA2096219A1/en not_active Abandoned
-
1993
- 1993-05-18 GB GB9310245A patent/GB2265279A/en not_active Withdrawn
- 1993-05-25 KR KR1019930701553A patent/KR970000571B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2265279A (en) | 1993-09-22 |
| BR9205474A (en) | 1994-04-05 |
| KR970000571B1 (en) | 1997-01-13 |
| WO1993006683A1 (en) | 1993-04-01 |
| KR930702848A (en) | 1993-09-09 |
| GB9310245D0 (en) | 1993-07-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19990125 |