Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
1999-10-22
2003-05-20
Patel, Ajit (Department: 2664)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S469000, C370S349000
Reexamination Certificate
active
06567401
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an access network loaded with a V5.2 protocol in a wireless communication system and more particularly to a separate structure in which a datapath layer and a physical layer are separately loaded onto different boards in the access network loaded with the V5.2 protocol and to a method of communicating a protocol between the two boards respectively loaded with the separate physical and datapath layers.
2. Description of Related Art
Generally, a V5.2 protocol is a signaling interface rule between a system controller and a switching center in a wireless communication system. According to the V5.2 protocol, maximum 16 E
1
links (1048 Kbps) each having a transmission rate of 128 Kbps can be used in a single interface and a protocol for protection of communication channels exists when more than one link is used.
The following explain concerns a connection structure between a public switched telephone network (PSTN) switching center and the access network loaded with the V5.2 protocol in the wireless communication system according to a prior art.
FIG. 1
shows the connection structure between the PSTN switching center and the access network loaded with the V5.2 protocol in the wireless communication system according to the prior art. An access network board
10
loaded with the V5.2 protocol is divided into a LAYER 3
110
, a data link management layer
120
, a datapath layer
130
and a physical layer
140
.
The physical layer
140
of the access network board
10
is connected to a PSTN switching center
400
via 16 E
1
links. Here, the LAYER 3
110
of the access network board
10
is composed of multiple protocols.
The multiple protocols comprises: a call process channel allocation section
111
for allocating a call process channel; an E
1
link switching controller
113
for switching from a selected E
1
link to another E
1
link when the selected E
1
link is out of order; an E
1
link controller
115
for blocking or unblocking the E
1
link according to a command of a manager; a user port management section
117
for managing a user port connected to the access network board
10
; and a voice channel allocation section
119
for allocating a voice channel.
The data link management layer
120
of the access network board
10
manages data link (E
1
link) connection with the PSTN switching center
400
and controls flow of data transmission according to a command of each protocol.
The datapath layer
130
of the access network board
10
supports relay mechanism with respect to protocol messages of the LAYER 3
110
. The physical layer
140
is a transmission device for transmitting and receiving the protocols between the datapath layer
130
and the PSTN switching center
400
via the E
1
links.
Although the V5.2 protocol provides maximum 16 E
1
links per interface board according to the prior art, it is nearly impossible to design a system such that all the links are implemented in one board when the V5.2 protocol is actually applied to the system. In other words, according to the conventional access network board
10
loaded with the physical layer
140
connected to the E
1
link, two E
1
links are connected to one physical layer
140
. To cover the 16 E
1
links, the access network board
10
needs 8 physical layer boards. However, only two or three physical layer boards can be disposed per access network board
10
in an aspect of actually designing the physical layer
140
board.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a separate structure of a datapath layer and a physical layer within an access network loaded with a V5.2 protocol in a wireless communication system and a communication method between two boards separately having the datapath layer and the physical layer that substantially obviates one or more of the limitations and disadvantages of the related art.
An objective of the present invention is to provide a separate structure of a datapath layer and a physical layer within an access network loaded with a V5.2 protocol in a wireless communication system, wherein the datapath layer and the physical layer are separated in the access network board loaded with the V5.2 protocol and the separated datapath and physical layers are connected using a router, thereby facilitating the designing of the access network board loaded with the V5.2 protocol.
Another objective of the present invention is to provide a method of communicating protocol messages between a board with the datapath layer and a board with the physical layer.
Additional features and advantages of the invention will be set forth in the following description, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure as illustrated in the written description and claims hereof, as well as the appended drawings.
To achieve these and other advantages, and in accordance with the purpose of the present invention as embodied and broadly described, in a connection structure between a PSTN switching center and a V5.2 protocol access network including a protocol board comprising a datapath layer and a plurality of physical layers, a separate structure of a datapath layer and a physical layer within the access network loaded with the 5.2 protocol in the wireless communication system, comprises: a plurality of physical layer boards with the plurality of physical layers separated from the protocol board and connected to the PSTN switching center via a plurality of E
1
links; a routing section disposed between a group of the multiple physical layer boards and the protocol board with the datapath layer, for designating a protocol transmission path between the datapath layer in the protocol board and one of the multiple physical layer boards and for routing packet data including a protocol message between the designated physical layer board and the protocol board; and a controller for providing a control signal to the routing section to allow the packet data to be routed to the designated physical layer board or the protocol board via the routing section.
In another aspect of the present invention, a method of communicating a protocol between a protocol board having a datapath layer and one of multiple physical layer boards having multiple physical layers, comprises: a forward communication step of transmitting a packet including a message requesting connection, information designating an E
1
link and a protocol message to the physical layer board via the routing section and determining whether or not an E
1
link corresponding to the information designating the E
1
link contained in the packet is normal so as to transmit the protocol message to the PSTN switching center via the corresponding E
1
link if the corresponding E
1
link is determined to be normal; and a reverse communication step of receiving a protocol message from the PSTN switching center via the corresponding designated E
1
link and forming a packet for the protocol message if the received protocol message is normal so as to transmit the normal protocol message to the datapath layer in the protocol board via the routing section.
The forward communication step comprises the steps of: transmitting the packet including a destination address, a source address and the E
1
link designating information from the protocol board to the physical layer board via the routing section for request of connection; activating an E
1
link corresponding to the designating information contained in the transmitted packet and determining whether or not the corresponding E
1
link is stable; forming a packet including state information denoting that the corresponding E
1
link is stable and transmitting the packet including the state information of the corresponding E
1
link to the protocol board via the routing section if the corresponding E
1
link is determined to be stable; forming a packet including t
Hyundai Electronics Ind. Co. Ltd.
Jacobson & Holman PLLC
Jain Raj
Patel Ajit
LandOfFree
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