A dynamic channel assignment method for voice packet transmission cellular system

Abstract

PRMA (Packet Reservation MultipleAccess), a packet multiple access scheme with reservation, is well-known for its high spectrum efficiency in the timedomain owing to the statistical multiplexing effect. In order to apply packet transmission to cellular system where spectrum efficiency in spacedomain is important, this paper proposes a distributed dynamic channel assignment method where =use partitioning is established by using one slot exclusively used for reservation and assigning packet transmission slots by base station Furthermore several techniques are introduced to improve performance. Computer simulation ~s u l t s show packet dropping probability is greatly decmsed by the proposed method.

A distributed dynamic channel assignment method with packet‐data transmission during the silent periods of circuit‐switched‐voice communications for cellular systems

“…Since the reservation data are of small size, the slot is divided into several reservation slots for use. Based on the received power, when the terminal sends a signal in the reservation slot, the interference wave power of the slot and CIR (carrier-to-interference ratio) are calculated, and the signal is assigned to the slot that satisfies the required CIR [10].…”

“…The basic parameters are the same as those used in Ref. 10. The average number of data packets is calculated by assuming an average data size of 256 kbyte, divided by the packet size (4000 packets).…”

“…In a microcellular system, however, the estimation of interference is difficult, as can be seen in the case of the effect of buildings on radio waves, making it difficult for channel assignment to cells in advance. Thus, it is necessary to assign channels at each base station by an autonomous and distributed scheme [10].…”

A dynamic channel assignment method for TDMA/FDMA packet transmission cellular system

“…In the assignment of the time-division channel, the slot assignment method proposed by the authors based on PRMA is used [7]. Figure 2(a) shows the flowchart.…”

“…The authors intended to apply PRMA to the cellular system, and introduced the carrier sense mechanism. By the assignment from the base station, the efficiency in time is improved [6,7]. In this scheme, only the assignment of the time-division channel (slot) is considered; that of the carrier frequency is not considered.…”