The topology optimization of CCS7 network was formulated in Xin and Xu (1998); the A/B plane partition of HSTPs in CCS7 network is discussed here in detail. The problem is proved to be NP-complete, so neural network and genetic algorithms are applied. With test networks generated randomly, the computing results show that the genetic algorithm is quite robust.
Topology of CCS7 networkCommon Channel Signaling (CCS) is one of the signaling methods by which a separate (from service circuits) common channel conveys signaling information for multiple service circuits. CCS network is the key support network for modern telecommunication networks. CCS No.7 (CCS7) and the CCS7 network are the standard recommendations of CCITT (CCITT Blue Book, 1988).The CCS7 network consists of signaling points (SPs), signal transfer points (STPs) and signaling links (SLs). SP is a center as an origin and destination of signaling messages. STP transfers the signaling messages from one link to another. SL is a digital transmitting circuit, which connects SP to STP, and STP to STP.The technical standard of Chinese CCS7 network, referring to the recommendations of CCITT, provides that the Chinese CCS7 network employs a three-level hierarchy system with A/B plane in first-level, and adopts the quasi-associated mode of signaling:(1) STPs at the first level (HSTPs) are partitioned into A and B planes; HSTPs in each plane are fully connected, but only the paired HSTPs between the two planes are connected. A pair of HSTPs is home STPs in a first-level signaling region.(2) Each STP at the second level (LSTP) is connected to its two home HSTPs respectively.
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