Adaptive Transmission Bandwidth Based Packet Scheduling for LTE Uplink

Calabrese, Francesco; Rosa, Claudio; Anas, M.; Michaelsen, Per Henrik; Pedersen, Klaus I.; Mogensen, Preben

doi:10.1109/vetecf.2008.316

Cited by 75 publications

(44 citation statements)

References 4 publications

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“…Furthermore, the scheduling is always frequencyselective proportional fair according to [9] and retransmissions are processed by means of a synchronous, non-adaptive hybrid automatic repeat request (HARQ) protocol with incremental redundancy. In this regard, we assume that both baseband signal exchange and joint signal processing are completed in time, so that the specified round-trip time for a HARQ protocol process is not exceeded.…”

Section: Simulation Methodologymentioning

confidence: 99%

“…Both the average spectral efficiency and the celledge throughput, which is defined as the 5 th percentile of the UE throughput distribution, are illustrated and we consider the Macro 1 and Macro 3 cases, respectively. If not stated otherwise, we always assume that at most three inter-site Proportional-fair according to [9] Link-to-system interface MIESM BS antenna spacing 10 λ, λ: wavelength Power control sectors per UE can cooperate with each other. Hence, the cooperation cluster in case of inter-site joint detection consists of the two intra-site sectors plus the additional inter-site ones.…”

Section: Simulation Methodologymentioning

confidence: 99%

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Inter-Site Joint Detection with Reduced Backhaul Capacity Requirements for the 3GPP LTE Uplink

Frank

Müller

Speidel

2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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Abstract-Cellular networks operating with a frequency reuse factor of one are often interference-limited. For that reason, base station (BS) cooperation techniques aiming at mitigating the effects of interference caused by simultaneous transmissions on the same frequency resources in nearby sectors may considerably improve the system performance. However, for that purpose generally high-capacity backhaul links are required, which are often not available in practice. A crucial factor for realizing such cooperative techniques in the short-term therefore is to develop efficient ways for reducing the backhaul load without significantly worsening the achievable performance. In this paper, we evaluate the performance of inter-site joint detection with reduced backhaul capacity requirements for the uplink of a 3GPP UTRAN Long Term Evolution (LTE) system, where different BSs cooperate with each other in order to jointly detect the signals transmitted by various users. By means of extensive systemlevel simulations, we show that with the proposed methods still significant performance gains may be realized over conventional systems-especially in terms of the cell-edge throughput-while the backhaul load can be considerably reduced compared to a system with full-complexity joint detection.

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Section: Simulation Methodologymentioning

confidence: 99%

Section: Simulation Methodologymentioning

confidence: 99%

Inter-Site Joint Detection with Reduced Backhaul Capacity Requirements for the 3GPP LTE Uplink

Frank

Müller

Speidel

2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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“…Based on the scheduling priorities in (1), the PRB allocation is performed according to the algorithm presented in [8]. In contrast to the downlink, where orthogonal frequency division multiplexing (OFDM) is used as access scheme, the resource allocation in the uplink is generally more complex since SC-FDMA only allows allocated subcarriers (PRBs) to be either adjacent or evenly spaced in order to achieve a low peakto-average power ratio [9], leading to a significantly reduced allocation flexibility.…”

Section: Proportional Fair Scheduling Mechanismmentioning

confidence: 99%

“…In contrast to the downlink, where orthogonal frequency division multiplexing (OFDM) is used as access scheme, the resource allocation in the uplink is generally more complex since SC-FDMA only allows allocated subcarriers (PRBs) to be either adjacent or evenly spaced in order to achieve a low peakto-average power ratio [9], leading to a significantly reduced allocation flexibility. For this reason, the fundamental idea in [8] is to start the resource allocation with the PRB associated with the highest scheduling priority and assign adjacent PRBs until either a different UE has a higher scheduling priority or the maximum transmit power is reached. This way, the UEs are approximately assigned according to the envelope of the scheduling priorities, thus exploiting the multi-user diversity as well as the frequency selectivity of the channel while taking the allocation constraints due to SC-FDMA into account.…”

Section: Proportional Fair Scheduling Mechanismmentioning

confidence: 99%

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Cooperative interference-aware joint scheduling for the 3GPP LTE uplink

Frank

Müller

Droste

et al. 2010

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

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Abstract-In current cellular networks base stations (BSs) usually perform independent scheduling without coordinating the resource allocation among different cells. This, however, often leads to high interference levels in cellular networks operating with universal frequency reuse, such as the 3GPP UTRAN Long Term Evolution (LTE). Coordinated scheduling between different BSs may mitigate this problem by taking interference from and to nearby BSs into account in order to avoid high interference situations, especially for user equipments (UEs) located near the cell-edge. For that purpose, we propose in this paper a novel interference-aware joint scheduling scheme based on proportional fairness for the uplink of a 3GPP UTRAN LTE system, where different BSs cooperate with each other via a fast backhaul network in order to jointly allocate frequency resources to the various UEs, taking the caused inter-cell interference into account. Furthermore, we propose an efficient method for dynamic interference coordination based on the standardized high interference indicator and we compare the achievable performance with this approach to a system with interferenceaware joint scheduling. It is shown that our joint scheduling scheme outperforms a dynamic interference coordination scheme and that it yields significant gains over a conventional LTE Release 8 system without any interference coordination.

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Resource sharing in LTE‐Advanced relay networks: uplink system performance analysis

Bulakçı

Saleh

Redana

et al. 2012

Trans. Emerging Tel. Tech.

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Relay-enhanced networks are expected to fulfil the demanding coverage and capacity requirements in a cost-efficient way. Type 1 inband relaying has been standardised as an integral part of the Third Generation Partnership Project (3GPP) Long-Term Evolution Release 10 and beyond (LTE-Advanced). This type of relay nodes (RNs) supports a relaying mode where the RN to donor evolved node B (donor eNB, DeNB) link (relay link, a.k.a. backhaul link) transmission is time-division multiplexed with the RN-served user equipments (RUEs) to RN link (access link) transmission, whereas macrocell-served user equipments (MUEs) share the same resources with the RNs at DeNB. Hence, system performance depends strongly on the resource sharing strategy among and within the links. Further, the set of subframes assigned for the relay link transmission is semi-statically configured and thus a dynamic reconfiguration to adapt to fast-changing system conditions (e.g. RN cell load) is not viable. Besides, in order to fully exploit the benefits of relaying, the inter-cell interference, which is increased because of the presence of RNs, should be limited via a proper power control (PC) scheme on each link. Therefore, an optimisation of both the resource sharing and PC strategy is required to enhance the overall performance of relay networks. In order to tackle these issues, we employ a statistic-based over-provisioned backhaul subframe allocation to be utilised for flexible co-scheduling of RNs and MUEs at the DeNB. In addition, we propose a combination of RN scheduling based on the number of RUEs and user throughput throttling achieving max-min fairness. Performance analysis of various resource sharing techniques along with PC optimisation is then carried out within the LTE-Advanced uplink framework in urban and suburban scenarios. Comprehensive results show that the proposed schemes achieve significant throughput gains and high system fairness with substantially increased flexibility in resource allocation.

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Adaptive Transmission Bandwidth Based Packet Scheduling for LTE Uplink

Cited by 75 publications

References 4 publications

Inter-Site Joint Detection with Reduced Backhaul Capacity Requirements for the 3GPP LTE Uplink

Inter-Site Joint Detection with Reduced Backhaul Capacity Requirements for the 3GPP LTE Uplink

Cooperative interference-aware joint scheduling for the 3GPP LTE uplink

Resource sharing in LTE‐Advanced relay networks: uplink system performance analysis

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