One key requirement in the radio access design of advanced, third-generation mobile systems is the ability to accommodate a variety of service types via flexible and efficient multiple-access protocols. This paper introduces a multiple-access protocol, SIR++ (service integration for radio access), which has the potential for meeting the service requirements of speech, video, and bursty data traffic in an efficient way. SLR++ is evolved from and generalizes a former protocol, SIR, which only considered the requirements of speech and data. The paper also evaluates the buffer occupancy distribution associated with an (H.263) video connection by solving a worst case model of the system.

The traffic performance of third generation mobile systems is greatly influenced by the multiple access protocols used in the radio access subsystem. The paper introduces an access protocol, SIR (service integration radio access), which has the potential for accommodating the requirements of speech and bursty data traffic in an efficient way. SIR is evolved from a protocol (PRMA++) studied in the framework of a TDMA-based version of the European Universal Mobile Telecommunication System, UMTS, and uses dedicated mechanisms for data bandwidth request collection and servicing.

Traffic engineering of ISDN (integrated services digital network) has become a key area of CCITT recommendations since 1985. The authors report on the first recommendations formalized in a dedicated series on ISDN traffic engineering, the CCITT E.700 series of recommendations. The authors also report on the ongoing work towards an extension of the series to cover integration of mobile services into ISDN, the E.750 series. Future directions related to such emerging issues as intelligent network services and broadband-ISDN/ATM (asynchronous transfer mode) are also reviewed.>

We investigate flow-control issues in local-area networks consisting of multiple token rings interconnected through bridges. To achieve high throughput, bridges perform only a very simple routing and store-and-forward function, but are not involved in error- or flowcontrol. In case of congestion, bridges discard arriving frames, which will be recovered through an appropriate end-to-end protocol between the communicating stations. The end-to-end protocol considered is the IEEE 802.2 type-2 logical-link-control (LLC) protocol. Extensive simulations show that performance can be severely degraded if, in such a network, the LLC protocol is employed as defined today. Therefore, we suggest an enhancement to this protocol in the form of a dynamic flow-control algorithm. As our results demonstrate, this enhancement guarantees close-to-optimal network performance under both normal traffic load and overload conditions.