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Concentric MAIO and Timeslot Orthogonalization for an Enhanced Intra- and Intersite Interference Reduction DMA strategy (EIR-DMA)

IP.com Disclosure Number: IPCOM000021829D
Published in the IP.com Journal: Volume 4 Issue 3 (2004-03-25)
Included in the Prior Art Database: 2004-Mar-25
Document File: 7 page(s) / 139K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

A common strategy for capacity enhancement in today's GSM-GPRS/EDGE networks with narrow-band deployment is using radio link control options (synthesized Frequency Hopping (FH), Power Control (PC) and Discontinuous Transmission (DTX)) with Static MAIO (Mobile Allocation Index Offset) Allocation (SMA). The main prerequisites of this method include Frame Number synchronization of the sectors at each site, assignment of equal Hopping Sequence Numbers (HSNs) to sectors of the same site, splitting the set of MAIOs available at the site (there are as many MAIOs available at the site as the number of hopping frequencies allocated per site) into three subsets (3-sector sites assumed) of different MAIOs for each sector. In most practical deployments equal MAIO values are statically assigned to all the channels of the same transceiver (TRX) while random FH and different HSNs on a site basis are used for a maximum frequency and interference diversity. By appropriate assignment of MAIOs SMA provides complete control over intra-site adjacent and co-channel interference. However due to the fixed MAIO allocation to TRXs the maximum fractional load achievable by SMA in each sector is below 33% (due to hard blocking) even if the impairment by interference may not be the limiting factor.

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Concentric MAIO and Timeslot Orthogonalization for an Enhanced Intra- and Intersite Interference Reduction DMA strategy (EIR-DMA)

Idea: Dr. Carstens Ball, DE-Muenchen; Dr. Ivanov Kolio, DE-Muenchen; Robert Mueller, DE- Muenchen; Ulrich Rehfuess, DE-Muenchen; Hubert Winkler, AT-Willendorf

A common strategy for capacity enhancement in today's GSM-GPRS/EDGE networks with narrow- band deployment is using radio link control options (synthesized Frequency Hopping (FH), Power Control (PC) and Discontinuous Transmission (DTX)) with Static MAIO (Mobile Allocation Index Offset) Allocation (SMA). The main prerequisites of this method include Frame Number synchronization of the sectors at each site, assignment of equal Hopping Sequence Numbers (HSNs) to sectors of the same site, splitting the set of MAIOs available at the site (there are as many MAIOs available at the site as the number of hopping frequencies allocated per site) into three subsets (3- sector sites assumed) of different MAIOs for each sector. In most practical deployments equal MAIO values are statically assigned to all the channels of the same transceiver (TRX) while random FH and different HSNs on a site basis are used for a maximum frequency and interference diversity. By appropriate assignment of MAIOs SMA provides complete control over intra-site adjacent and co- channel interference. However due to the fixed MAIO allocation to TRXs the maximum fractional load achievable by SMA in each sector is below 33% (due to hard blocking) even if the impairment by interference may not be the limiting factor.

To further increase network capacity the number of TRXs installed per site shall be increased over the number of hopping frequencies available, resulting in a MAIO reuse within the site, thus introducing continuous intra-site co-channel interference as well as adjacent channel interference within the same sector, which might degrade the radio quality below an acceptable level. Dynamic MAIO Allocation (DMA) has been introduced to assign an appropriate (Time Slot) TS/MAIO combination to a new call request such that hard blocking encountered in SMA deployments is avoided while intra-site adjacent and co-channel interference can still be controlled. The benefits of DMA are remarkable especially in case of instantaneous inhomogeneous traffic distribution within the site due to efficient utilization of the common MAIO pool at site level.

Unfortunately both methods SMA and DMA reveal the same drawbacks: inter-site adjacent and co- channel interference cannot be taken into account for the selection of TS/MAIO for the new channel request. Since inter-site interference is substantially dominating over intra-site interference further capacity increase can only be achieved by providing a method capable of reducing and controlling both intra-site and inter-site interference in 1x1 frequency reuse.

DFCA (Dynamic Frequency Channel Assignment), a method proposed by Nokia [1] claiming to achie...