CA2412005A1 - Method and sytem for mobile communications - Google Patents

Method and sytem for mobile communications Download PDF

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Publication number
CA2412005A1
CA2412005A1 CA002412005A CA2412005A CA2412005A1 CA 2412005 A1 CA2412005 A1 CA 2412005A1 CA 002412005 A CA002412005 A CA 002412005A CA 2412005 A CA2412005 A CA 2412005A CA 2412005 A1 CA2412005 A1 CA 2412005A1
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Canada
Prior art keywords
mobile station
network
branch
enciphering
encipherment
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Granted
Application number
CA002412005A
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French (fr)
Other versions
CA2412005C (en
Inventor
Motoshi Tamura
Mutsumaru Miki
Akiko Okamoto
Kenya Kusunose
Akihiro Uchikoshi
Daisuke Igarashi
Katsuhiko Yamagata
Takaaki Sato
Junichiro Hagiwara
Yasuyuki Watanabe
Takuya Hamajima
Masafumi Hata
Nobutaka Ishikawa
Yoshiyuki Yasuda
Kazufumi Yunoki
Nobuhide Uchiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Original Assignee
Ntt Mobile Communications Network Inc.
Motoshi Tamura
Mutsumaru Miki
Akiko Okamoto
Kenya Kusunose
Akihiro Uchikoshi
Daisuke Igarashi
Katsuhiko Yamagata
Takaaki Sato
Junichiro Hagiwara
Yasuyuki Watanabe
Takuya Hamajima
Masafumi Hata
Nobutaka Ishikawa
Yoshiyuki Yasuda
Kazufumi Yunoki
Nobuhide Uchiyama
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Publication date
Application filed by Ntt Mobile Communications Network Inc., Motoshi Tamura, Mutsumaru Miki, Akiko Okamoto, Kenya Kusunose, Akihiro Uchikoshi, Daisuke Igarashi, Katsuhiko Yamagata, Takaaki Sato, Junichiro Hagiwara, Yasuyuki Watanabe, Takuya Hamajima, Masafumi Hata, Nobutaka Ishikawa, Yoshiyuki Yasuda, Kazufumi Yunoki, Nobuhide Uchiyama filed Critical Ntt Mobile Communications Network Inc.
Publication of CA2412005A1 publication Critical patent/CA2412005A1/en
Application granted granted Critical
Publication of CA2412005C publication Critical patent/CA2412005C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

When a network pages the temporary user mobile identifier of a mobile station, the mobile station sends a response to the network. Next, the network checks the authenticity of the user using a ciphering key, corresponding to the temporary user mobile identifier and a random number. If the temporary user mobile identifier is authenticated, a normal incoming call acceptance procedure is executed. If the mobile station is authenticated although the temporary user mobile identifier is wrong, the network reassigns a new temporary user mobile identifier to the mobile station and stops the current communication. In communication, the network and the mobile station mutually notify encipherment-onset time and negotiate about encipherment manner with each other. In addition, diversity handover is commenced upon a call attempt. Furthermore, if a branch replacement is necessary, the current branch is replaced by new branches capable of executing the diversity handover.
Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, the mobile station uses the same branch structure and the same communication frequency band for all of calls. Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, a branch structure and a communication frequency band, which can continue all of the calls, are selected and used. Therefore, the mobile communications system is suitable for transmission of various sorts of data in accordance with the development of multimedia.

Claims (99)

1. A method for mobile communication carried out among a plurality of mobile stations and a network, personal identifiers being previously and respectively assigned to the mobile stations, the method comprising the steps of:
assigning temporary identifiers respectively to mobile stations which are communicable with the network;
storing the personal identifiers and the temporary identifiers of the mobile stations by the network;
storing the personal identifier and the temporary identifier of each mobile station by the mobile station;
detecting by the network that one of the temporary identifiers stored in itself is different from that stored in the corresponding mobile station; and reassigning by the network another temporary identifier to the mobile station of which the former temporary identifier stored in the network is detected to be different from that stored in the corresponding mobile station.
2. A base station controller communicating with a mobile station, which is able to conduct diversity reception, via a plurality of radio base stations under control of a switching center, the controller comprising enciphering means for enciphering transmitted information, which has been received from the switching center and should be transmitted to the mobile station, so as to generate enciphered transmitted information.
3. A base station controller communicating with a mobile station, which is able to conduct diversity reception, via a plurality of radio base stations under control of a switching center, the controller comprising:
retransmission-control-information-adding means for adding retransmission control information to enciphered transmitted information which has been previously enciphered by the switching center; and transmitting means for transmitting the enciphered transmitted information with the retransmission control information to the radio base stations.
4. A switching center communicating with a mobile station, which is able to conduct diversity reception, via a plurality of radio base stations and the base station controller according to claim 2, the switching center comprising enciphering means for enciphering transmitted information, which should be transmitted to the mobile station, so as to generate enciphered transmitted information.
5. A system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the system being characterized in that the base station controller enciphers information, which should be transmitted from the side of the switching center to the side of the mobile station, before transmitting the information to the base station controller.
6. A system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the system being characterized in that the switching center enciphers information, which should be transmitted from the side of the switching center to the side of the mobile station, before distributing the information to the radio base stations.
7. A system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the system comprising layer-2-enciphering-means for enciphering mtormation that should be processed only in one or more layers which are the same as or higher than layer 2 of the OSI reference model.
8. A system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the system comprising:
layer-3-enciphering-means for enciphering information that should be processed only in one or more layers which are the same as or higher than layer 3 of the OSI reference model; and layer-2-mutual-notifying-means for facilitating notification between layers of different devices corresponding to layer 2 of the OSI reference model about an onset of transmission of enciphered information.
9. A system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the system comprising:
layer-3-enciphering-means for enciphering information that should be processed only in one or more layers which are the same as or higher than layer 3 of the OSI reference model;
retransmission-control-information-adding means, at a layer corresponding to layer 2 of the OSI reference model, for adding retransmission control information to information which has been previously enciphered by the layer-3-enciphering means;
and transmitting means for transmitting the enciphered transmitted information with the retransmission control information to the radio base stations.
10. A method for controlling a base station controller communicating with a mobile station, which is able to conduct diversity reception, via a plurality of radio base stations under control of a switching center, the method comprising the step of enciphering transmitted information, which has been received from the switching center and should be transmitted to the mobile station, so as to generate enciphered transmitted information.
11. A method for controlling a base station controller communicating with a mobile station, which is able to conduct diversity reception, via a plurality of radio base stations under control of a switching center, the method comprising the steps of:
adding retransmission control information to enciphered transmitted information which has been previously enciphered by the switching center; and transmitting the enciphered transmitted information with the retransmission control information to the radio base stations.
12. A method for controlling a switching center communicating with a mobile station, which is able to conduct diversity reception, via a plurality of radio base stations and the base station controller according to claim 3, the method comprising the step of enciphering transmitted information, which should be transmitted to the mobile station, so as to generate enciphered transmitted information.
13. A method for controlling a system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the method comprising the step of, at the base station controller, enciphering information, which should be transmitted from the side of the switching center to the side of the mobile station, before distributing the information to the radio base stations.
14. A method for controlling a system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the method comprising the step of, at the switching center, enciphering information, which should be transmitted from the side of the switching center to the side of the mobile station, before distributing the information to the radio base stations.
15. A method for controlling a system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the method comprising the step of enciphering information that should be processed only in one or more layers which are the same as or higher than layer 2 of the OSI reference model.
16. A method for controlling a system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the method comprising the steps of:
enciphering information that should be processed only in one or more layers which are the same as or higher than layer 3 of the OSI reference model; and facilitating notification between layers of different devices corresponding to layer 2 of the OSI reference model about an onset of transmission of enciphered information.
17. A method for controlling a system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the method comprising the steps of:
enciphering information that should be processed only in one or more layers which are the same as or higher than layer 3 of the OSI reference model;
adding retransmission control information at a layer corresponding to layer 2 of the OSI reference model to information which has been previously enciphered by the enciphering step; and transmitting the enciphered transmitted information with the retransmission control information to the radio base stations.
18. A mobile station communicating with a network over the air, comprising decipherment-onset-time-setting-means for setting a time to start deciphering an enciphered reception signal dependently on a time to start enciphering a transmission signal in the network and independently of a time to start enciphering a transmission signal in the mobile station.
19. A mobile station according to claim 18 further comprising deciphering means for deciphering an enciphered reception signal received from the network over the air, the decipherment-onset-time-setting-means including:
encipherment-onset-request-determining means for determining if a reception encipherment onset request is received from the network or not; and decipherment-instructing means for instructing the deciphering means to start deciphering in accordance with a time when the reception encipherment onset request has been received on the basis of the determination.
20. A mobile station communicating with a network over the air, comprising encipherment-onset-time-setting-means for setting a time to start enciphering a transmission signal independently of a time to start deciphering an enciphered reception signal.
21. A mobile station according to claim 20 further comprising:
transmission-encipherment-onset-requesting means for transmitting a transmission encipherment onset request to the network over the air; and enciphering means for enciphering the transmission signal so as to generate an enciphered transmission signal, the encipherment-onset-time-setting-means including encipherment-instructing means for instructing the enciphering means to start enciphering in accordance with a time when the transmission encipherment onset request has been transmitted.
22. A controller in a network communicating with a mobile station over the air, comprising decipherment-onset-time-setting-means for setting a time to start deciphering an enciphered reception signal dependently on a time to start enciphering a transmission signal in the mobile station and independently of a time to start enciphering a transmission signal in the controller.
23. A controller in a network according to claim 22 further comprising deciphering means for deciphering an enciphered reception signal received from the mobile station over the air, the decipherment-onset-time-setting-means including:
encipherment-onset-request-determining means for determining if a reception encipherment onset request is received from the network or not; and decipherment-instructing means for instructing the deciphering means to start deciphering, in accordance with a time when the reception encipherment onset request has been received on the basis of the determination.
24. A controller in a network communicating with a mobile station over the air, comprising encipherment-onset-time-setting-means for setting a time to start enciphering a transmission signal independently of a time to start deciphering an enciphered reception signal.
25. A controller in a network according to claim 24, further comprising:
transmission-encipherment-onset-requesting means for transmitting a transmission encipherment onset request to the mobile station over the air;
and enciphering means for enciphering the transmission signal so as to generate an enciphered transmission signal, the encipherment-onset-time-setting-means including encipherment-instructing means for instructing the enciphering means to start enciphering in accordance with a time when the transmission encipherment onset request has been transmitted.
26. A system for mobile communication comprising a mobile station and a network communicating with each other over the air, the network comprising:
encipherment-onset-requesting means for transmitting an encipherment onset request to the mobile station over the air;
first-enciphered-transmission-signal-generating means for enciphering a first transmission signal which should be transmitted from the network to the mobile station after the transmission of the encipherment onset request, thereby generating a first enciphered transmission signal;
first-enciphered-transmission-signal-transmitting means for transmitting the first enciphered transmission signal to the mobile station;
response determining means for determining if an encipher onset response by the mobile station indicating that the encipherment onset request is acceptable is received or not; and first deciphering means for starting to decipher a second enciphered transmission signal from the mobile station on the basis of the determination of the response determining means when the mobile station accepts the encipherment onset request, the mobile station comprising:
request determining means for determining if the encipherment onset request is received or not;
encipherment-onset-responding means for transmitting the encipherment onset response on the basis of the determination of the request determining means when the encipherment onset request is accepted;
second deciphering means for starting to decipher the first enciphered transmission signal from the network when the encipherment onset request is accepted;
second-enciphered-transmission-signal-generating means for enciphering a second transmission signal which should be transmitted from the mobile station to the network after the transmission of the encipherment onset response, thereby generating a second enciphered transmission signal; and second-enciphered-transmission-signal-transmitting means for transmitting the second enciphered transmission signal to-the network.
27. A method for controlling a mobile station communicating with a network over the air, comprising the step of setting a time to start deciphering an enciphered reception signal dependently on a time to start enciphering a transmission signal in the network and independently of a time to start enciphering a transmission signal in the mobile station.
28. A method for controlling a mobile station according to claim 27, further comprising the step of deciphering an enciphered reception signal received from the network over the air, the step of setting a time to start deciphering including the steps of determining if a reception encipherment onset request is received from the network or not; and instructing to start the deciphering step in accordance with a time when the reception encipherment onset request has been received on the basis of the determination.
29. A method for controlling a mobile station communicating with a network over the air, comprising the step of setting a time to start enciphering a transmission signal independently of a time to start deciphering an enciphered reception signal.
30. A method for controlling a mobile station according to claim 29, further comprising the steps of transmitting a transmission encipherment onset request to the network over the air; and enciphering the transmission signal so as to generate an enciphered transmission signal, the step of setting a time to start enciphering including the step of instructing to start the enciphering step in accordance with a time when the transmission encipherment onset request has been transmitted.
31. A method for controlling a controller in a network communicating with a mobile station over the air, comprising the step of setting a time to start deciphering an enciphered reception signal dependently on a tame to start enciphering a transmission signal in the mobile station and independently of a time to start enciphering a transmission signal in the controller.
32. A method for controlling a controller in a network according to claim 31, further comprising the step of deciphering an enciphered reception signal received from the mobile station over the air, the step of setting a time to start deciphering including the steps of determining if a reception encipherment onset request is received from the network or not; and instructing to start the deciphering step in accordance with a time when the reception encipherment onset request has been received on the basis of the determination.
33. A method for controlling a controller in a network communicating with a mobile station over the air, comprising the step of setting a time to start enciphering a transmission signal independently of a time to start deciphering an enciphered reception signal.
34. A method for controlling a controller in a network according to claim 33, further comprising the steps of:
transmitting a transmission encipherment onset request to the mobile station over the air; and enciphering the transmission signal so as to generate an enciphered transmission signal, the step of setting a time to start enciphering including the step of instructing to start the enciphering step in accordance with a time when the transmission encipherment onset request has been transmitted.
35. A method for controlling a system for mobile communication in which a mobile station and a network communicate with each other over the air, the method comprising the steps of:
transmitting an encipherment onset request from the network to the mobile station over the air;
enciphering a first transmission signal which should be transmitted from the network to the mobile station after the transmission of the encipherment onset request, thereby generating a first enciphered transmission signal;
transmitting the first enciphered transmission signal to the mobile station;
determining if an encipher onset response by the mobile station indicating that the encipherment onset request is acceptable is received or not;
starting to decipher a second enciphered transmission signal from the mobile station on the basis of the determination of the response determining step when the mobile station accepts the encipherment onset request;
determining if the encipherment onset request is received or not;
transmitting the encipherment onset response on the basis of the determination of the request determining step when the encipherment onset request is accepted;
starting to decipher the first enciphered transmission signal from the network when the encipherment onset request is accepted;
enciphering a second transmission signal which should be transmitted from the mobile station to the network after the transmission of the encipherment onset response, thereby generating a second enciphered transmission signal; and transmitting the second enciphered transmission signal to the network.
36. A mobile station communicating with a network over the air, comprising encipherment-procedure-notifying-means for notifying the network about encipherment-procedure-specifying-information specifying one or more possible encipherment procedures of the mobile station.
37. A mobile station, wherein encipherment-procedure-notifying-means further including the enciphering-key-generation-procedure-notifying-means for notifying the network about enciphering-key-generation-procedure-specifying-information specifying one or more possible enciphering key generation procedures of the mobile station.
38. A mobile station communicating with a network over the air according to claim 36, comprising encipherment communication means for conducting an encipherment procedure corresponding to an encipherment request given by the network and for communicating with the network.
39. A mobile station according to claim 38, wherein the encipherment communication means includes enciphering-key-generating-means for generating an enciphering key corresponding to enciphering-key-generation-procedure-specifying-means specifying an enciphering key generation procedure notified by the network;
and enciphering means for conducting an encipherment procedure using the enciphering key generated by the enciphering-key-generating-means.
40. A controller in a network communicating with a mobile station over the air, comprising:
encipherment-procedure-selecting means for selecting an encipherment procedure for communication in accordance with encipherment-procedure-specifying-information, specifying one or more possible encipherment procedures of the mobile station, notified by the mobile station; and encipherment requesting means for notifying the mobile station about an encipherment request requesting the mobile station to conduct an encipherment using the encipherment procedure selected by the encipherment-procedure-selecting means.
41. A controller in a network according to claim 40, further comprising:
enciphering-key-generation-procedure-selecting-means far selecting an enciphering key generation procedure in accordance with enciphering-key-generation-procedure-specifying-information, specifying one or more possible encipherment procedures of the mobile station, notified by the mobile station; and enciphering-key-notifying means for notifying the base station about the enciphering key generation procedure selected by the enciphering-key-generation-procedure-selecting-means.
42. A method for controlling access links between a mobile station and a network, characterized in that a plurality of branches axe established between the network and the mobile station upon a call attempt to or from the mobile station located at a position where the mobile station can communicate using diversity handover, the plurality of branches including a main branch and at least one auxiliary branch for additional use in order that the mobile station may communicate using diversity handover, thereby enabling the mobile station to commence the diversity handover using the plurality of branches.
43. A method according to claim 42, wherein the branches are formed between the network and the mobile station via a single base station, thereby enabling the mobile station to commence infra-cell diversity handover.
44. A method according to claim 42, wherein the branches are formed between the network and the mobile station via a plurality of base stations, respectively, thereby enabling the mobile station to commence inter-cell diversity handover
45. A method according to claim 42, wherein the mobile station measures the levels of receptions from circumferential base stations, selects candidate zones for the diversity handover on the basis of the measurement, and notifies the network about the candidate zones, and the network selects the branches in light of the notification from the mobile station,
46. A method according to claim 42, wherein the network transmits a message;
including a request to establish the branches, to the mobile station and commences the diversity handover for communicating with the mobile station.
47. A mobile station characterized in that it establishes a plurality of branches.
between the network and the mobile station upon the reception of a message from the network when no access link is established between the network and the mobile station, the message including a request for establishing the branches, thereby commencing the diversity handover using the plurality of branches.
48. A mobile station according to claim 47, wherein if the request instructs to establish the branches between the mobile station and a single base station, the mobile station establishes the requested branches between the mobile station and the single base station, thereby commencing intra-cell diversity handover.
49. A mobile station according to claim 47, wherein if the request instructs to establish the branches between the mobile station and a plurality of base stations, the mobile station establishes the requested branches between the mobile station and the base stations, thereby commencing inter-cell diversity handover.
50. A base station controller characterized in that it establishes a plurality of branches between a network and a mobile station upon a call attempt to or from the mobile station at a location where the mobile station can communicate using diversity handover, the plurality of branches including a main branch and at least one auxiliary branch for additional use in order that the mobile station may communicate using diversity handover.
51. Abase station controller characterized in that it transmits a message to both of a base station and a mobile station upon a call attempt, to or from the mobile station at a location where the mobile station can communicate by means of intra-cell diversity handover wherein the mobile station and the base station communicate with each other using a plurality of branches, the message including a request for establishing a plurality of branches including a main branch and at least one auxiliary branch for additional use in order that the mobile station may communicate by means of infra-cell diversity handover.
52. A base station controller characterized in that it transmits a message to a plurality of base stations upon a call attempt to or from the mobile station at a location where the mobile station can communicate by means of inter-cell diversity handover wherein the mobile station communicates with the plurality of base stations, the message including a request for establishing a plurality of branches between the mobile station and the corresponding base stations.
53. A base station characterized in that it establishes a plurality of branches between the base station and the mobile station according to an instruction from a base station controller upon a call attempt to or from the mobile station at a location where the mobile station can communicate by means of infra-cell diversity handover wherein the mobile station and the base station communicate with each other using the plurality of branches, the plurality of branches including a main branch and at least one auxiliary branch for additional use in order that the mobile station may communicate by means of infra-cell diversity handover, thereby enabling the mobile station to commence the infra-cell diversity handover.
54. A method for controlling a branch replacement characterized in that at least a current branch between a network and a mobile station are replaced with a plurality of branches necessary for communication using diversity handover when the branch replacement is necessary for the mobile station and when it is recognized that the mobile station can commence communicating using diversity handover if the branch replacement is carried out, thereby enabling the mobile station to commence diversity handover.
55. A method according to claim 54, wherein the network additionally establishes an auxiliary branch for the mobile station, and then releases the current branch, so as to complete the branch replacement for communicating using diversity handover.
56. A mobile station characterized in that it replaces at least a current branch between a network and the mobile station with a plurality of branches necessary for communication using diversity handover when a branch replacement is necessary for the mobile station and when the mobile station can commence communicating using the diversity handover branches if the branch replacement is carried out, thereby commencing diversity handover.
57. A base station controller characterized in that it replaces at least a current branch between a network and a mobile station with a plurality of branches necessary for communication using diversity handover when a branch replacement is necessary for the mobile station and when it is recognized that the mobile station can commence communicating using diversity handover if the branch replacement is carried out, thereby enabling the mobile station to commence diversity handover.
58. Abase station controller characterized in that it transmits a message to a base station and a mobile station when a branch replacement is necessary for the mobile station and when it is recognized that, if the branch replacement is carried out, the mobile station can commence communicating by means of intra-cell diversity handover wherein the mobile station and the base station communicate with each other using a plurality of branches, the message including an instruction to carry out the branch replacement and an instruction to add at least one auxiliary branch for additional use in order to communicate using diversity handover.
59. Abase station controller characterized in that it transmits an instruction to a plurality of base stations and a message to a mobile station when a branch replacement is necessary for the mobile station and when it is recognized that the mobile station can commence communicating by means of inter-cell diversity handover if the branch replacement is carried out, the instruction instructing the base stations to set branches necessary for the diversity handover, the message including an instruction to carry out the branch replacement and an instruction to add at least one auxiliary branch for additional use in order to communicate using diversity handover.
60. A base station characterized in that it replaces a branch for a mobile station and adds at least one auxiliary branch for the mobile station according to instructions of a message once the base station receives the message from a base station controller, the message including an instruction to carry out branch replacement and an instruction to add at least one auxiliary branch for additional use in order to communicate using diversity handover, thereby commencing the intra-cell diversity handover.
61. A branch controlling method for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, at least either of branch structures for both of the calls or at least either of communication frequency bands for both of the calls is controlled, so that the branch structures are the same as each other and the communication frequency bands are the same as each other.
62. A branch controlling method for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the a branch structure and a communication frequency band, being the same as those for the existent call, are assigned to the new call.
63. A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the mobile station uses a branch structure and a communication frequency band, being the same as those for the existent call, for the new call in accordance with an instruction from a network.
64. A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the base station controller controls at least either of branch structures for both of the calls or at least either of communication frequency bands for both of the calls, so that the branch structures are the same as each other and the communication frequency bands are the same as each other.
65. A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the base station controller assigns a branch structure and a communication frequency band, being the same as that for the existent call, to the new call.
66. A branch controlling method adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, another branch structure or another communication frequency band which can continue both of the existent and new calls is selected, and the selected branch structure or communication frequency band is assigned to both of the existent and new calls.
67. A method according to claim 61, wherein the. existent call is assigned to diversity handover branches and the new call is also assigned to the same diversity handover branches if possible.
68. A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, the mobile station assigns another branch structure or another communication frequency band, which can continue both of the existent and new calls, to both of the existent and new calls in accordance with an instruction from a network.
69. A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, the base station controller selects another branch structure or another communication frequency band which can continue both of the existent and new calls, and assigns the selected branch structure or communication frequency band to both of the existent and new calls.
70. A branch controlling method adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls, a branch structure or a communication frequency band which can continue all of the calls is selected, and the selected branch structure or communication frequency band is assigned to all of the calls commonly
71. A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls, the mobile station, according to an instruction from a network, alters a branch structure or a communication frequency band for all of the calls to a new branch structure or a new communication frequency band for all of the calls commonly.
72. A base station controller adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls, the base station controller selects a branch structure or a communication frequency band which can continue all of the calls, anal assigns the selected branch structure or communication frequency band to all of the calls commonly
73. A branch controlling method adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls and when there is not a branch structure which can continue all of the calls in relation to the mobile station or when there is not a communication frequency band which can continue all of the calls in relation to the mobile station, another branch structure or another communication frequency band which can continue a plurality of calls being high in priority among the calls are selected; the other call or calls are released; and the selected branch structure and communication frequency band are assigned to the priority calls.
74. A mobile station characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls and when there is not a branch structure which can continue all of the calls in relation to the mobile station or when there is not a communication frequency band which can continue all of the calls in relation to the mobile station, the mobile station, according to an instruction from a network, releases a call or calls being low in priority; and assigns a branch structure and a communication frequency band selected by the network to a plurality of calls being high in priority.
75. A base station controller adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls and when there is not a branch structure which can continue all of the calls in relation to the mobile station or there is not a communication frequency band which can continue all of the calls in relation to the mobile station, the base station controller selects another branch structure and another communication frequency band which can continue a plurality of calls being high in priority among the calls;
releases the other call or calls; and assigns the selected branch structure and communication frequency band to the priority calls.
76. A method for establishing a control channel in a mobile communication system wherein a mobile station treats a plurality of calls using a plurality of sets of wireless communication resources, characterized in that a single control channel is established between the mobile station and a network for transporting control information therebetween in a manner that the control channel is formed by one of the sets of wireless communication resources which are being used for a plurality of calls by the mobile station.
77. A method for controlling to replace a control channel, characterized in that while a mobile station treats a plurality of calls using a plurality of sets of wireless communication resources and transmits or receives control information to or from a network via a single control channel formed by one of the sets of the wireless communication resources, and when a first call using the control channel formed by one of the sets of the wireless communication resources should be released and a second call should be continued, the control channel, which is formed by one of the sets of the wireless communication resources and should be released, is replaced with a new control channel formed by another set of the wireless communication resources, thereby continuing to control the second call.
78. A base station controller, characterized in that while a mobile station treats a plurality of calls using a plurality of sets of wireless communication resources and transmits or receives control information to or from a network via a control channel formed by one of the sets of the wireless communication resources, and when a first call using the control channel formed by one of the sets of the wireless communication resources should be released and a second call should be continued, the controller replaces the control channel, which is formed by one of the sets of the wireless communication resources and should be released, to a new control channel formed by another set of the wireless communication resources, thereby continuing to control the second call.
79. A method for determining a radio zone and an uplink transmission power, characterized in that each of base stations transmits broadcast information indicating a perch channel transmission power level and an uplink interference level via a corresponding perch channel; and a mobile station receives the broadcast information from near base stations around the mobile station;
detects respective reception levels of the perch channels for the near base stations;
calculates respective path losses between the mobile station and respective near base stations on the basis of the respective reception levels and the respective perch channel transmission power levels within the broadcast information;
calculates respective necessary uplink transmission power levels between the mobile station and respective near base stations on the basis of the calculated respective path losses, the respective uplink interference levels within the broadcast information, and required signal-to-interference ratios involved in reception by the near base stations;
selects a radio zone in which the necessary uplink transmission power level is minimum among the respective necessary uplink transmission power levels, the base station of the selected radio zone being ready for communication with the mobile station or being able to commence communication with the mobile station after handover; and controls an uplink transmission power in the selected radio zone based on the necessary uplink transmission power level of the selected radio zone.
80. A base station comprising means for transmitting broadcast information indicating a perch channel transmission power level and an uplink interference level via a perch channel.
81. A mobile station characterized in that it receives broadcast information from near base stations around the mobile station via respective perch channels, the broadcast information from each of the near base stations indicating a perch channel transmission power level and an uplink interference level;
detects respective reception levels of the perch channels for the near base stations;
calculates respective path losses between the mobile station and respective near base stations on the basis of the respective reception levels and the respective perch channel transmission power levels within the broadcast information;
calculates respective necessary uplink transmission power levels between the mobile station and respective near base stations on the basis of the calculated respective path losses, the respective uplink interference levels within the broadcast information, and respective signal-to-interference ratios involved in reception by the respective near base stations;
selects a radio zone of which the necessary uplink transmission power level is minimum among the respective necessary uplink transmission power levels, the base station of the selected radio zone being ready far communication with the mobile station or being able to commence communication with the mobile station after handover; and controls an uplink transmission power in the selected radio zone based on the necessary uplink transmission power level of the selected radio zone.
82. A handover controlling method for additionally establishing a handover branch between a mobile station and a network, characterized in that a procedure for additional establishment of a branch is completed with a state transition to which the mobile station can commence communicating without waiting for a confirmation of synchronization for all branches.
83. A handover controlling method according to claim 82, wherein the procedure for additional branch establishment is completed with confirmation of synchronization for one branch among the branches established for the mobile station.
84. A mobile station characterized in that if the mobile station has received a request from a network to establish a new additional branch between the network and the mobile station, the mobile station establishes the new branch and then starts diversity reception upon reception of a signal through the new branch.
85. A base station characterized in that if the base station has received a request from a base station controller to establish a new additional branch between a mobile station and the base station for carrying out intra-cell diversity handover, the base station additionally establishes the new branch and then starts intra-cell diversity reception upon reception of a signal through the new branch.
86. A base station characterized in that if the base station has received a request from a base station controller to establish a new additional branch between a mobile station and the base station for carrying out inter-cell diversity handover, the base station establishes the new branch and then starts sending the received signals to the b ase station controller that executes inter-cell diversity reception upon reception of a signal through the new branch.
87. Abase station controller characterized in that when the base station controller establishes a new additional branch between a mobile station and a network, the base station controller provides a request for establishing the new branch and then completes a procedure for additional establishment of the new branch without a confirmation of synchronization for all branches between the mobile station and the network.
88. A base station controller according to claim 87, wherein the base station controller provides the request for establishing the new branch being necessary for inter-cell diversity handover, and then starts inter-cell diversity reception upon reception of signals through the branches being necessary for inter-cell diversity handover.
89. A radio mobile communication system wherein a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that the system comprises code-resource-assigning means for assigning at least a part of an assignable code resource to one of the channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.
90. A radio mobile communication system according to claim 89, further comprising channel-assigning means for assigning one of the channels, to which a part of the assignable code resource is assigned, to a mobile station in accordance with a transmission rate necessary for the mobile station.
91. A radio mobile communication system wherein a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that the system comprises a plurality of assignable code resources, each of code resources corresponding to a certain bandwidth and being independent of the other code resources; and reassigning means for reassigning a part of an assignable code resource to one of the channels to which a part of another assignable code resource is already assigned if there is not an unused code resource corresponding to a bandwidth suitable for a necessary transmission rate when assigning an unused assignable code resource to one of the channels in accordance with the necessary transmission rate.
92. A radio mobile communication system according to claim 91, further comprising unused-code-resource determining means for determining if there is an unused code resource having a code resource length suitable for a necessary transmission rate or not when assigning an unused assignable code resource to one of the channels in accordance with the necessary transmission rate necessary.
93. A radio mobile communication system according to claim 91, wherein at least one standard code resource corresponding to a predetermined bandwidth is preselected and the system comprises assignment-possibility-determining means for determining at predetermined moments if there is at least one unused standard code resource or not, the reassigning means reassigning a part of an assignable code resource to one of the channels to which a part of another assignable code resource is already assigned until an unused standard code resource is reserved if the determination result by the assignment-possibility-determining means has been negative.
94. A radio base station for which a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that it comprises code-resource-assignment-possibility-determining means for determining whether or not it is possible to assign at least a part of an assignable code resource to one of channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.
95. A base station controller for controlling the radio base station according to claim 94, further comprising channel-assigning means for assigning a channel, to which a part of assignable code resource is assigned, to a mobile station in accordance with a transmission rate necessary for the mobile station.
96. A method for controlling a radio mobile communication system wherein a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that the method comprises code-resource-assigning step for assigning at least a part of an assignable code resource to one of the channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.
97. A method for controlling a radio mobile communication system including a plurality of assignable code resources, each of code resources corresponding to a certain bandwidth and being independent of the other code resources, a plurality of channels being capable ofbeing established on a single carrier frequency by code division multiplex access, characterized in that in order to assign an unused assignable code resource to one of the channels in accordance with a necessary transmission rate, the method comprises the steps of determining whether or not there is an unused code resource having a code resource length in accordance with the necessary transmission rate; and reassigning a part of an assignable code resource to one of the channels to which a part of another assignable code resource is already assigned if the determination indicates that there is not an unused code resource having a bandwidth suitable for the necessary transmission rate.
98. A method for controlling radio base station for which a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that it comprises a code-resource-assignment-possibility-determining step for determining whether or not it is possible to assign at least a part of an assignable code resource to one of channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.
99. A method for controlling a radio base station according to claim 94, comprising a channel-assigning step for assigning a channel, to which a part of an assignable code resource is assigned to a mobile station in accordance with a transmission rate necessary for the mobile station.
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