Mobile communication system

Details Mobile communication system Mobile communication system

2000-05-05

2003-11-04

Trost, William (Department: 2683)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S561000, C455S550100, C455S445000, C455S418000, C379S269000, C379S268000, C370S437000, C370S398000, C709S238000, C709S245000, C709S250000

Reexamination Certificate

active

06643525

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile communication system that includes a mobile switching center having a multiprocessor configuration and at least one radio base station subordinate to the mobile switching center.
2. Description of the Related Art
Referring to
FIG. 12
, an exemplary configuration is shown of such a mobile communication system that includes a mobile switching center having a multiprocessor configuration and a plurality of radio base stations subordinate to the mobile switching center.
In the shown example, a system S
1
comprises a mobile switching center MSC that includes a plurality of processors CPR
1
to CPRn, and a plurality of radio base stations BSC
1
to BSC
5
subordinate to the processors.
The processors CPR
1
to CPRn of
FIG. 12
example are subjected to an integrated control by a main processor MPR. The radio base stations BSC
1
and BSC
2
are allocated to the processor CPR
1
, with the radio base stations BSC
3
and BSC
4
allocated to the processor CPR
2
. Location areas LAC
1
to LAC
3
are subordinate correspondingly to the radio base stations BSC
1
to BSC
5
.
In
FIG. 12
, the processors CPR
1
to CPRn are linked to another system S
2
.
In another configuration shown in
FIG. 13
, a single radio base station BSC connects with mutually independent signaling links from the respective processors CPR
1
, CPR
2
, etc.
One goal of the configurations of
FIGS. 12 and 13
is to improve the reliability. The
FIG. 13
configuration in particular may often be employed in cases where the radio base station BSC does not balance with the mobile switching center MSC in respect of subscriber capacities and throughputs.
In a relationship between the mobile switching center MSC and the radio base station BSC that have a system specification of
FIG. 13
configuration, a small subscriber capacity of system configuration provides the ratio of 1:1 or 2:1 in the corresponding relation between the processors CPR of the mobile switching center MSC and the radio base station BSC as in exemplary configurations of
FIGS. 14 and 15
, whereas a large subscriber capacity of system configuration provides the ratio of multitude: multitude in the corresponding relation between the processors CPR and the radio base stations BSC as shown in FIG.
16
.
In such a mobile communication system S
1
, consideration is given to the case where a call from a subscriber of the other system S
2
or of that system S
1
is received by a mobile subscriber MS under the system S
1
.
Although the termination call is controlled at that time, the processor CPR having a control program MCA for controlling that call is a processor that takes charge of call originating control in case of the call under its own system, but it is a processor that has received the call control information in case of an incoming connection call from the other system.
By means of a signaling connection control part (SCCP) that corresponds to the third layer in the function level of No. 7 signaling system, the processor CPR sends a mobile subscriber MS call demand signal PAGE to the radio base station BSC. Used herein is a connectionless signal from the SCCP.
The radio base station BSC then calls the mobile MS and returns a call response signal PAGE_RSP responding thereto to the mobile switching center MSC. Used herein is a connection oriented signal from the SCCP.
Such a prior art may allow the destination of return of the call response signal PAGE_RSP to result in the processor other than the processor CPR in which the termination call is controlled.
More specifically, in the exemplary configuration of
FIG. 17
shown in a manner corresponding to
FIGS. 15 and 16
, when the processor CPR
1
sends a call demand signal PAGE to the radio base station BSC
1
, a call response signal PAGE_RSP responding thereto may possibly be returned to the processor CPR
2
.
Referring to
FIG. 17
, the processor CPR in the layer configuration includes an incoming call control part ICA, a moving call control part MCA and a moving protocol control part MPC. The processor interface part F
1
has the functions of the SCCP, signaling network level MPT and level
2
in the No. 7 signaling system.
The radio base station BSC has an interface part equivalent to the processor interface part F
1
and has a base station call control part BCA and a radio call control part RCA.
In the event that the call response signal PAGE_RSP has been returned to the processor CPR
2
different from the processor CPR
1
that sent the call demand signal PAGE as described above, all the subsequent call control signals required have to be transferred between the processor CPR
1
and the processor CPR
2
.
The reason is that the call response signal PAGE_RSP sent form the radio base station BSC
1
is a connection request message (connection establishing demand) of the SCCP connection oriented signal and that to ensure the sequence of the subsequent sending data the same SLS (signaling link selection) value is used to provide a control such that sending is made to the same signaling link.
This often resulted in an increase in the amount of resources (the amount of memory block, processor activity ratio, etc.) for use in the interprocessor communication, as compared with the case where the call response signal PAGE_RSP has been returned to the same processor CPR.
In order to transfer data signals from the processor CPR
2
to the processor CPR
1
, as shown in
FIGS. 18A and 18B
the call response signal PAGE_RSP (
FIG. 18B
) is arranged to include the CPR number within the call ID information TAG contained in the call demand signal PAGE (FIG.
18
A).
Alternatively, use may be made of a mobile identifier IMSI contained in the call response signal PAGE_RSP to search the subscriber data base being managed in the main processor MPR. Otherwise, for the signals following the call response signal PAGE_RSP, a local reference number including the processor CPR number may be placed in a CC message returned from the mobile switching center MSC whereby the local reference number can automatically be inserted into the subsequent signals sent from the radio base station BSC.
The processor number can thus be readily identified for transfer. The transfer may be effected by way of the SCCP layer or the call control (application).
In any case, however, an increase will be inevitable in the amount of resources for use in the interprocessor communication.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to provide a signaling link selection method and apparatus in which the destination of return of a call response signal PAGE_RSP is arranged to result in a processor CPR having controlled termination calls thereby preventing any increase in the amount of resources (the amount of memory block, processor activity ratio, processor-to-processor adapter activity ratio) for use in the interprocessor communication.
According to a first aspect of the present invention, in order to achieve the above object, a mobile communication system includes a mobile switching center having a multiprocessor configuration and at least one radio base station subordinate to the mobile switching center, with a single radio base station being connected with signaling links independent of a plurality of processors within the mobile switching center.
Then, when a call issued from the or other system is received by a subscriber under the system, call ID information contained in a mobile call demand signal sent from the mobile switching center to the radio base station has a storage area for an identifier of a processor within the mobile switching center, and the radio base station allows the destination of return of a mobile call response signal to be the processor indicated by the processor identifier.
Preferably, in case no processor identifier is stored in the mobile switching center processor identifier storage area of the call ID information contained in the mobile call demand signal, the radio base station selects at random a sign

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