Mobile communication system

Details Mobile communication system Mobile communication system

1996-08-02

1999-11-30

Bost, Dwayne D.

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455440, 455445, 455432, 455436, H04Q 720

Patent

active

059958375

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a mobile communication system, and especially to handover control functions for changing channel assignment of a mobile station when the mobile station roams from a current location area to another location area.


BACKGROUND ART

It is generally known that, in a mobile communication system, each mobile station communicates with others via a subscriber switching node of a current location area. When the mobile station roams from the current location area to another area, the communication channel passing through the subscriber switching node in the current location area should be changed over to another communication channel passing through a subscriber switching node in the location area which is the roaming destination. The change of communication channels is executed by so-called handover control. The handover control adopted for conventional mobile communication systems will be described below.
FIG. 9 shows an example configuration of a mobile communication network in which a fixed terminal 5 and a mobile station 1 communicate with each other. In FIG. 9, all the nodes in the fixed network side are omitted with exception of the fixed terminal. The fixed network and the mobile communication network are connected via a POI(i.e., point of interconnection) in the way of the interface point. A gateway conducting & switching node 51, being connected with other networks via the POI 4, is further connected with subordinate conducting & switching nodes 41 and 42. The conducting & switching node 41 is further connected with a subscriber switching node 31 controlling a location area 21. The conducting & switching node 42 is further connected with a subscriber switching node 32 controlling another location area 22.
The nodes 31, 32, 41, 42 and 51 and the POI 4 are previously appended with identifications so called routing numbers RN. The routing numbers are assumed to be RN1 to RN6. Furthermore, the nodes and the POI 4 are connected via channels 61 to 66. The nodes 31, 32, 41, 42 and 51 and the POI 4 stores routing tables, respectively, as shown in following Table-1.


TABLE 1 ______________________________________ Routing tables node 31 node 32 node 41 node 42 node 51 POI 4 ______________________________________ RN1: -- RN1: 62 RN1: 61 RN1: 64 RN1: 63 RN1: 66 RN2: 61 RN2: -- RN2: 64 RN2: 62 RN2: 65 RN2: 66 RN3: 61 RN3: 62 RN3: -- RN3: 64 RN3: 63 RN3: 66 RN4: 61 RN4: 62 RN4: 64 RN4: -- RN4: 65 RN4: 66 RN5: 61 RN5: 62 RN5: 63 RN5: 65 RN5: -- RN5: 66 RN6: 61 RN6: 62 RN6: 63 RN6: 66 RN6: 66 RN6: -- ______________________________________
The routing tables in Table-1 show the correspondence between nodes in the routing destinations and the channels to be selected. The uses of the tables will be described more specifically. First, if a call connection request for the fixed terminal 5 is originated from the mobile station 1, the call connection request is judged, in the subscriber switching node 31, to be forwarded to the POI 4. Consequently, in the subscriber switching node 31, the line "RN6" in the corresponding routing table is referred. The numeral "61" is stored there, so that the call connection request is further forwarded to the conducting & switching node 41 via the channel 61.
Then, in the conducting & switching node 41, the line "RN6" in the routing table stored in the node 41 is referred. The numeral "63" is stored there, so that the call connection request is further forwarded to the gateway conducting & switching node 51 via the channel 63. Similarly, the line "RN6" is referred in the gateway conducting & switching node 51. The numeral "66" is stored there, so that the call connection request is forwarded via the channel 66. As such, the call connection request originated from mobile station 1 is forwarded to the POI 4 via the channels 61, 63 and 66. Then, if the fixed terminal 5 is in communicatable condition, call set up and communication are executed between the mobile station 1 and the fixed terminal 5.
F

REFERENCES:
patent: 5117502 (1992-05-01), Onoda et al.
patent: 5454026 (1995-09-01), Tanaka
patent: 5457680 (1995-10-01), Kamm et al.

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