Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1999-08-25
2004-06-22
Chin, Wellington (Department: 2664)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S412000, C370S395100
Reexamination Certificate
active
06754218
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to construction of diversity handover processing apparatuses and network control systems using the same, and more particularly to a network control system for use in a multimedia network which mutually connects mobile radio network and other networks and is suitable for handling various kinds of media (voice/image/data) communicated at various speeds, and a diversity handover processor used in the system.
In digital networks in these days, widespread use has been made of a network handling radio signal transmission media such as a mobile radio network, in addition to the conventional cable network using metallic conductors or optical fibers. In connection with the mobile radio network as above, there are available the existing STM (synchronous transfer mode) network as described in “Mobile Communication System” published by Ohm-sha, a PDC (personal digital cellular) or PHS (personal handyphone system) radio network described in “Easy Digital Exchange” published by Denki Tsushin Kyokai in which signals carried on time slots are communicated like the time-division network for communicating signals carried on time-shared time slots within a synchronized frame, or a CDMA (code division multiple access) radio network as described in “EASY-TO-UNDERSTAND DESCRIPTION OF DIGITAL MOBILE COMMUNICATIONS” published by Ohm-sha, pp 32 and 33 in which signals modulated with codes different for the signals are communicated. Further, a wideband CDMA (hereinafter referred to as W-CDMA) described at page 85 and ensuing pages in “Nikkei Electronics No. 680 published by Nikkei BP has been highlighted as a communication system which can ensure transmission and reception of various kinds of signals at various speeds, such as voice, image and high-speed data with the same quality as that in the existing cable communication network even when the mobile station moves at a high speed and is expected to be put into practice as early as possible.
On the other hand, at present, there exist various networks including a STM (synchronous transfer mode) network, a packet network as described in “Basic Knowledge of Data Exchange” published by Denki Tsushin Kyokai in which signals carried on packets of variable length are communicated, an ATM (asynchronous transfer mode) network) as described in “E-ISDN Pictorial Reader” published by Ohm-sha in which signals carried on packets of fixed length called cells are communicated or an internet as described in “Mastering TCP/IP” published by Ohm-sha in which signals are carried on packets of variable length called IP packets and the IP packets are communicated pursuant to the procedures called intemet protocol(IP), and media of voice, image and data are communicated.
The aforementioned actual networks and communication systems have been developed and introduced independently of each other and signal forms (speed and format) and communication procedures (signal mode and protocol) differ for the individual networks and systems. In addition, characteristics of the networks are also different and therefore, there are differences in offered communication services and control mechanisms for offering the services (for example, the construction of operation system, the construction of hardware/software interfaces and the function and structure of communication application software).
The network user conducting transmission and reception of information by utilizing the networks and the provider offering the networks have an earnest desire for the elimination (or absorption) of differences in the aforementioned networks which will be conductive to communication in which the user and provider can be unconscious of the construction of the networks and the procedures and can communicate with the other party by using communication service permitting optimal communication of information whenever they want to use and whatever apparatus (terminal) they use, because this improves easiness of using the communication equipment, decreases costs and contributes to development of society. In other words, the advent of a network control system, a communication control apparatus and a method of controlling the system and apparatus has been desired which can unify the aforementioned various networks to absorb the differences in the individual radio networks and permit, through simplified control, inter-network connection that sets up mutual connection for communication. Especially, the mobile radio network such as W-CDMA is expected to be developed rapidly in the future and it is important to construct a unified network by mutually connecting various kinds of existing networks and the mobile radio network.
Handling of the signal process is sometimes required to be changed depending on differences in media and the mutual relation to other networks. Exemplarily, some of the signal process specific to mobile targets need the error correction coding process but on the other hand, in some applications, it is preferable that the coding process as above is not carried out from the standpoint of connection to the existing networks. Further, in the mobile communication, an interleave technique is employed for the sake of coping with the burst error. This technique is described in, for example, “Mobile Communication” edited by Masaaki Shinji, published by Maruzen Kabushiki Kaisha, according to which data processed to, for example, Reed-Solomon code are rearranged for transmission and they are reversely rearranged on the receiving side. During the rearrangement, a block memory of
m
rows and
n
, columns is used and there arises a delay in storage to the memory. Accordingly, in a service prone to be affected by the delay time, such as voice, the interleave process is not carried out in some applications even at the cost of debasement of the capability of error correction.
After the interleave process, data in a predetermined unit in the block memory is read collectively to provide burst-like data. Such data must be smoothed in accordance with a timing in a mobile radio network when transferred to that network and therefore there needs a buffer for receiving such a burst signal as above. When interleave is not carried out, no burst signal is generated and only control timed to the mobile radio network may be carried out.
Further, when down-load of file is effected during access to an internet, unidirectional traffic from the network to the terminal takes place and when it is presupposed that the same traffic passes bidirectionally, resources of one of the network and terminal becomes sometimes unwanted. Preferably, the use rate of individual media will be determined statistically to permit apparatus and network having the construction commensurate with the determined use rate to be constructed. But media used by users change day by day and the situation is further changed by mutual connection with other networks. Accordingly, when connection to various kinds of networks is taken into account, it is necessary that various kinds of service can be handled by way of individual connections and impairment of economical advantage can be prevented.
SUMMARY OF THE INVENTION
In diversity handover, a process is executed in which quality evaluation is effected in a unit of packet and a packet of good quality is selected. On the other hand, for the purpose of improving the line efficiency between the base station and the network control system, it is conceivable that the base station first stores a plurality of CPS (Common Part Sublayer) packets in a payload of one ATM cell and then transmits them to a network. In this case, the network control system cannot perform the diversity handover process unless the ATM cell is decomposed in a unit of packet to generate one ATM cell every CPS packet. The reason for this is that in the diversity handover, the quality evaluation being carried out in a unit of packet. Accordingly, in the network control system, the number of ATM cells is increased by the number of CPS packets and the process in the network control system is
Chin Wellington
Fox Jamal A.
Hitachi , Ltd.
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