Performance of Personal Portable Radio Telephone Systems with and without Guard Channels

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We present and compare three call handling schemes for a base station which can handle both originating calls (OC's) and prioritized handoff calls (HC's), and which serves these calls under the blocked-call-delayed basis. Delayed calls are assumed to be stored in a finite storage buffer. One scheme (Scheme I) exclusively allows handoff calls to be stored and to use a fixed number of guard channels. The other two schemes without guard channels (Scheme II-using the last-in/first-out policy for OC's, and Scheme III-using the first-in/first-out policy for OC's) allow both types of calls to be stored, and allow prioritized handoff calls to pushout originating calls if the buffer is full. For these three schemes, the blocking probabilities and delay distributions of both types of calls are numerically obtained, and a boundary for call handling schemes between with and without guard channels is found. From the numerical results, the schemes without guard channels reduce the call blocking probability of originating calls without a severe penalty on handoff calls, and thus provide higher total grade of service than the scheme with guard channels. For the two schemes without guard channels, Scheme II provides shorter average waiting time of calls than Scheme III. Thus, Scheme II can be a good candidate for a call handling scheme for microcellular systems.
Publisher
IEEE-Inst Electrical Electronics Engineers Inc
Issue Date
1993-06
Language
English
Article Type
Article
Keywords

QUEUE

Citation

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, v.11, no.6, pp.911 - 917

ISSN
0733-8716
URI
http://hdl.handle.net/10203/58819
Appears in Collection
EE-Journal Papers(저널논문)
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