Area coverage and capacity enhancement by multihop connection of CDMA cellular network

Fujiwara, Atsushi; Takeda, Satoshi; Yoshino, Hideaki; Otsu, Toru

doi:10.1109/vetecf.2002.1040645

Cited by 25 publications

(20 citation statements)

References 7 publications

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“…Hence, the transmitted amount of data for each time slot should be identical for all the nodes on the relaying path, 3 i.e., (4) where denotes the data rate on the th hop of the relaying path , and is the number of hops on the downstream path. Since and , each time slot length can be determined by the given period and the data rates as (5) Then, can be given by the number of effective transmitted bits per as (6) Now, we define the decision parameter as the ratio of the two effective data rates, the effective data rate in the multihop system and the effective data rate in the conventional system (7) Note that our network model is a hybrid of the conventional system and the multihop system; either the direct link or the multihop path can be selected, whichever case provides higher throughput. That is, the multihop path is selected if , otherwise, the direct link is selected.…”

Section: A Simple Relaying Without Concurrencymentioning

confidence: 99%

“…Previous works showed that the coverage of those systems can be increased by the multihop relaying, but that it is not easy to enhance the capacity under the interference-limited conditions, such as the case in the high-loaded systems with small cells [5]- [9]. 5 6 This is mainly due to the interference increase from the concurrently relayed transmissions.…”

Section: Impact On the Capacity Of The Conventional Power-controllmentioning

confidence: 99%

“…Hence, those results are insufficient to demonstrate, in general, the concurrency tradeoff. Moreover, several studies reported that it is not easy to enhance the capacity of code-division multiple-access (CDMA) systems by the use of the multihop relaying [5]- [9]. This is mainly due to the interference increase resulting from the concurrent transmissions.…”

mentioning

confidence: 99%

See 2 more Smart Citations

On the Throughput Enhancement of the Downstream Channel in Cellular Radio Networks Through Multihop Relaying

Cho

Haas

2004

IEEE J. Select. Areas Commun.

214

113

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Abstract-In this paper, we study the effect of multihop relaying on the throughput of the downstream channel in cellular networks. In particular, we compare the throughput of the multihop system with that of the conventional cellular system, demonstrating the achievable throughput improvement by the multihop relaying. We also propose a hybrid control strategy for the multihop relaying, in which we advocate the use of both, the direct transmission and the multihop relaying. Our study shows that most of the throughput gain can be obtained with the use of a two-and three-hop relaying scheme. Substantial throughput improvement could be additionally obtained by operating the concurrent relaying transmission in conjunction with the nonconcurrent transmission. We also argue here that the multihop relaying technology can be utilized for mitigating unfairness in quality-of-service (QoS), which comes about due to the location-dependent signal quality. Our results show that the multihop system can provide more even QoS over the cell area. The multihop cellular network architecture can also be utilized as a self-configuring network mechanism that efficiently accommodates variability of traffic distribution. We have studied the throughput improvement for the uniform, as well as for the nonuniform traffic distribution, and we conclude that the use of multihop relaying in cellular networks would be relatively robust to changes in the actual traffic distribution.

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Section: A Simple Relaying Without Concurrencymentioning

confidence: 99%

Section: Impact On the Capacity Of The Conventional Power-controllmentioning

confidence: 99%

See 1 more Smart Citation

On the Throughput Enhancement of the Downstream Channel in Cellular Radio Networks Through Multihop Relaying

Cho

Haas

2004

IEEE J. Select. Areas Commun.

214

113

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“…Unlike the conventional cellular system, data packets in multi-hop cellular system, in addition to being transmitted directly between a mobile station (MS) and the base station (BS), can also be indirectly transmitted hop by hop with the help of relay stations (RSs). Recent studies have shown that this feature of the multi-hop cellular system can enhance coverage [2], improve system throughput [3], reduce transmission power [4,5], etc. Without any doubt, the multi-hop cellular system will become a very promising candidate in future wireless communication system.…”

Section: Introductionmentioning

confidence: 99%

System outage probability analysis in uplink multi-hop cellular systems over composite channels

Zhao

Wang

et al. 2011

J Wireless Com Network

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Owing to its superior performances, the multi-hop cellular system has drawn much attention in recent years. This paper aims to study the uplink system outage probability of the multi-hop cellular system over composite channels. Initially, we consider a composite channel model, which takes path loss, lognormal shadowing and Nakagami-m fading into account. Then, based on the amplify-and-forward relaying, the signal-to-noise ratio of each link is investigated. Further, an expression of the outage probability for a mobile station (MS) over a given position is derived after employing selective transmission scheme. After that, considering the distribution of MSs in the cellular systems, a numerical expression of the system outage probability is further obtained. Numerical results prove that the derived expression of the system outage probability can provide very good approximation to the realistic outage performance without time-intensive simulations. Moreover, it's also shown that the muilti-hop cellular system in this paper outperforms the conventional cellular system in terms of outage probability.

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“…Although we do not know how far away our algorithm is from the optimum power allocation, simulation results indicate that the developed algorithm works well. It is the development of a power allocation algorithm for this new topology (many one-to-one or several-to-one links) which distinguishes this paper from some other recent publications on CDMA relaying networks, such as [4,5].…”

Section: Reverse-link Power Allocation In Two-hop Multimedia Cdma Netmentioning

confidence: 99%

Reverse-link power allocation in two-hop multimedia CDMA networks

Walsh

Yanıkömeroğlu

Canadian Conference on Electrical and Computer Engineering 2004 (IEEE Cat. No.04CH37513)

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-Recently there has been significant interest in augmenting the cellular networks with the multihop capability to obtain better high data rate performance in the context of enhanced-3G and beyond-3G networks. This paper deals with the power allocation strategies in the reverse-link of two-hop multimedia CDMA networks. In this envisioned network, the WTs (wireless terminals) which cannot establish a direct link with the BS (at the required rates) seek the assistance of those WTs which can; in other words, whenever needed, some WTs are used as relayers for some other WTs (relayees) if this is possible. In a two-hop link, the first hop (relayee to relayer) uses the unlicensed band and the second hop (relayer to BS) uses the cellular band. This arrangement not only guarantees that no additional expensive cellular spectrum will be used to facilitate a two-hop link, but it also guarantees that if anything goes wrong in the first hop, this will not affect the performance of the WTs which directly communicate with the BS in the cellular band.The performance of any CDMA network depends on the implementation of a good power allocation and control scheme. The optimum power allocation and control in the reverse link of the conventional single-hop CDMA networks is well known. The main contribution of this paper is the development of a good power allocation scheme (which is tied to the proper selection of relayers) in the first hop of the two-hop reverse-link of the envisioned CDMA network. It is worth emphasizing that the nature of the reverse-link power allocation problem is very different in the many one-to-one links (or possibly numerous several-to-one links) which collectively constitute the first hop of the two-hop CDMA network under consideration, in comparison to that in the single many-to-one link in the reverse link of a conventional single-hop CDMA network.The simulation results show that the two-hop relaying, facilitated with the developed novel power allocation scheme, yields considerable enhancements in the CDMA cell capacity, coverage, and throughput.

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Area coverage and capacity enhancement by multihop connection of CDMA cellular network

Cited by 25 publications

References 7 publications

On the Throughput Enhancement of the Downstream Channel in Cellular Radio Networks Through Multihop Relaying

On the Throughput Enhancement of the Downstream Channel in Cellular Radio Networks Through Multihop Relaying

System outage probability analysis in uplink multi-hop cellular systems over composite channels

Reverse-link power allocation in two-hop multimedia CDMA networks

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