Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1998-04-17
2001-10-30
Hsu, Alpus H. (Department: 2662)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S466000, C370S469000
Reexamination Certificate
active
06310890
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a system for executing mutual protocol in an electronic communications system, and more particularly to a system of processing, converting and distributing a message in a network hierarchy for a fixed subscriber unit (FSU) in a Broad band Code Division Multiple Access Wireless Local Loop (B-CDMA WLL).
2. Description of the Related Art
Conventionally, a network hierarchy of an FSU and radio carrier station (RCS) in the B-CDMA WLL includes 7 layers according to the Open Systems Interconnection (OSI) model of the International Organization for Standardization (ISO), as shown in FIG.
1
. In the first layer L
1
PHL/MAC (Layer
1
Physical/Medium Access Control), the FSU comprises a subscriber line interface circuit module (SLIC
2
)
2
, ADPCM/PCM module
4
, MAC module
6
and PHL module
8
while the RCS comprises a PHL module
22
and MAC module
24
. The second layer L
2
DLC (Layer
2
Data Link Control) provides the FSU and RCS with their respective DLC modules
20
and
26
. The third layer L
3
NWK (Layer
3
NetWork) provides the FSU with a network module
18
. The higher layers provide the FSU with a subscriber module
12
, retaining module
14
, and message conversion and distribution module
16
. In addition, the FSU and RCS include lower layer management entities (LLME)
10
and
28
.
FIG. 1
illustrates the conventional network hierarchy of the FSU including a message conversion and distribution module
16
, which formats a message communicated between the network module
18
and the higher modules (subscriber module
12
and retaining module
14
) to distribute the formatted message among the higher modules
12
and
14
.
Describing the function of the network module
18
to control the message transferred to the subscriber module
12
and the retaining module
14
with reference to the flow chart of
FIG. 2
, the network module
18
analyzes the message in step
200
to determine in step
202
whether it is an error or normal. If it is an error, an error message is treated in step
204
and processing and transferring steps for the message are bypassed. Otherwise, a normal message is processed and formatted in step
206
, and transferred in step
208
to the message conversion and distribution module
16
, which again analyzes and format the formatted message to be accommodated to distribute it among the subscriber and retaining modules
12
and
14
.
Conversely, describing the function of the network module
18
to control the message coming from the subscriber and retaining modules
12
and
14
with reference to the flow chart of
FIG. 3
, the message conversion and distribution module
16
analyzes and formats the message to be transferred to the network module
18
, which in turn executes the steps
300
to
308
similar to those of
FIG. 2
to transfer to the DLC module
20
.
The conventional system as described suffers from the drawback that the message conversion and distribution module
16
requires the message exchange and corresponding protocol with the network module
18
, which degrades the speed of processing data.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method of processing, converting and distributing a message communicated between a network module and a subscriber module and a retaining module in a network hierarchy of an FSU in the B-CDMA WLL, which does not require the message conversion and distribution module.
According to the present invention, there is provided a system of processing, converting and distributing a message in the network hierarchy of a fixed subscriber unit (FSU) in a Broad band Code Division Multiple Access Wireless Local Loop (B-CDMA WLL). The network hierarchy includes first to seven layers. The first layer is provided with a SLIC
2
, ADPCM/PCM module, MAC module, PHL module and LLME. The second layer is provided with a DLC module. The third layer is provided with a network module. The higher layers are provided with a subscriber module and a retaining module. The network module serves to process and format a message communicated between the LLME and the subscriber or retaining module to distribute the formatted message among the subscriber and retaining modules or conversely to transfer the message to the LLME.
The present invention will now be described by way of example with reference to the figures.
REFERENCES:
patent: 5642356 (1997-06-01), Wenk
patent: 5796742 (1998-08-01), Klotzbach et al.
patent: 5960004 (1999-09-01), Ramstrom et al.
Dilworth & Barrese LLP
Ho Duc
Hsu Alpus H.
Samsung Electronics Co,. Ltd.
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