Multiplex communications – Communication techniques for information carried in plural... – Assembly or disassembly of messages having address headers
Reexamination Certificate
1998-12-31
2003-05-13
Ton, Dang (Department: 2666)
Multiplex communications
Communication techniques for information carried in plural...
Assembly or disassembly of messages having address headers
C370S432000
Reexamination Certificate
active
06563840
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method of transmitting and receiving broadcast message in a communication system.
Generally, in the service of a mobile communication system like CDMA, the broadcast message service which is provided to the subscribers of the service is provided to the mobile terminal (or a mobile station) of the subscribers through paging channels and traffic channels.
There are three methods for transmitting the broadcast message by said paging channels. The first is a multi-slot broadcast transmission method which sends the broadcast message to all slots of a control channel so as to send the broadcast message by using all the mobile terminals which are located in the service area of a base station. This is the simple and fast method having no time delay in the message. However, this method gives a large load to the control channel and makes the process of the other message impossible. The second is a multi-slot broadcast paging method. This method is one kind of the improved multi-slot transmission methods and transmits the broadcast message after informing all the terminals of the broadcasting by transmitting the general paging messages with small size instead of large to all slots of the control channel. The third is a periodic broadcast paging method that is provided by mobile communication service companies. This method decides the on/off of the transmission service of the broadcast message and the period of the broadcast message by the broadcast index of the field in the extend system parameter message among the added service information messages that are transmitted by the base station, and transmits periodic broadcast messages according to the period.
Among the above three methods, the periodic broadcast paging method is the most effective one and informs the terminals of the fact that the base station is going to transmit periodically the broadcast messages. Thereafter, when a defined period is passed, this method transmits the broadcast message. The first slot of the period of which is informed to all terminals is called the reference slot. The general paging message including the broadcast address of the message that will be transmitted in the future is transmitted to this reference slot. From this broadcast address information, the terminals decide the type of the message, the arrival time of the message and whether the message is to be accepted or not. The broadcast message corresponding to each broadcast address must be transmitted by the period of three slots after the reference slot.
FIG. 1
is a block diagram showing the network structure of a general CDMA system.
Referring to
FIG. 1
, the mobile communication service using basically the CDMA system provides radio or wireline communication to the mobile communication subscribers by using the public switch telephone network(PSTN) (
1
) for the general telephone subscribers, which is provided by the communication network agent, and the integrated service digital network(ISDN) (
2
) providing communication service for both voice and data by a digital subscriber line.
A mobile switching center (MSC) (
3
a
) performs a circuit switching and a transit paging processing so that the subscriber is able to communicate with other mobile subscribers or general wireline subscribers by the mobile communication service, performs the functions of hand-off and roaming in order to provide a good quality of a communication service, and performs transport layer for the broadcast message transmission (
20
in FIGS.
2
and
3
).
Furthermore, the base station (
3
b
) is connected with the mobile station (
4
), which is either in a geostationary position or in moving, by the radio traffic path. Therefrom, the base station (
3
b
) connects the mobile station with the device performing the base station control by radio or wireline path and performs the relay layer (
30
in
FIGS. 3 and 4
) for the broadcast message transmission.
Furthermore, the base station contains the information about various kinds of mobile communication connected with the mobile switching center. Therefore, the base station also contains the current position information of the mobile station (
4
), the state of the mobile communications subscribers, the statistical data about the mobile communication and the information concerning to various services. There are also the home location register (
6
) to be connected with radio/wireline subscribers and the visitor location register (
5
) to be connected with the mobile switching center (
3
) in order to search the information for processing the paging from other network subscribers.
A cell broadcast center (
7
) which is an important element in the broadcast message transmission takes charge of the teleservice layer (
10
in FIGS.
3
and
4
). The short message entity (
8
) provides the broadcast message to said cell broadcast center (
7
).
The mobile communication service process of the basic network of the CDMA system in
FIG. 1
is omitted and only the transmission service for the broadcast message will be explained here.
Referring to
FIG. 1
, a communication network agent selects one of the three broadcast message transmission methods by the paging channels previously described.
A short message provider (
8
) sends the broadcast message which will be transmitted to the cell broadcast center (
7
) which takes charge of the teleservice layer (
10
). The broadcast message received by the cell broadcast center (
7
) is transmitted to the mobile station (
4
) through the mobile switching center (
3
a
) which takes charge of the transport layer (
20
) and the base station (
3
b
) which takes charge of the relay layer (
30
) shown in
FIGS. 2 and 3
.
Said base station (
3
b
) makes said broadcast message contents included in the data burst message and transmits it to the mobile station (
4
) through the paging channel by said selected broadcast message transmission method.
The multi-slot broadcast transmission method uses the data burst message. The multi-slot broadcast paging method and the periodic broadcast paging method use a general paging message.
The address field in the data burst message or the general paging message is filled with the broadcast address which is the address not the inborn address of the mobile station (
4
) but for the broadcast message transmission. According to this broadcast address, it is decided whether or not the broadcast message is received.
FIG. 4
shows the broadcast address for the broadcast message transmission in a conventional system. This address consists of two bit priority bits (PRIORITY), six bit message identification bits (MESSAGE_ID), eight bit zone identification bits (ZONE_ID), sixteen bit service bits (SERVICE) and eight bit language bits (LANGUAGE).
The broadcast address will be explained as follows. The two bit priority bits (PRIORITY) are to determine the priority of the broadcast messages to be broadcast when a plurality of broadcast messages are transmitted.
The six bit message identification bits (MESSAGE_ID) are to decide whether or not the current broadcast message is a duplicate copy of the message which has already been transmitted in order to avoid a duplicate transmission.
The
8
zone bits (ZONE_ID) are to discriminate an identical message received from a plurality of zones different from each other.
The
16
service bits (SERVICE) are used to classify the broadcast message transmission services by their items. The 8 language bits (LANGUAGE) are used as language indicator bits for the classification of the languages used for the broadcast message.
FIG. 2
shows the protocol stack structure for the broadcast message transmission service.
The link layer (
40
) in the lowest level is a protocol layer for establishing the connection of communication circuit for the communication service.
Relay layer (
30
) belonged to the base station (
3
b
) of
FIG. 1
is a protocol layer to discard, when broadcast messages having an identical broadcast address are received overlapping in time within a broadcast period, th
Fleshner & Kim LLP
LG Information & Communication, Ltd.
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