femtocell standardization in 3gpp

Salam,

Just arrived from here, and here a good post from Zahid Ghadialy and Hyung about Femtocell. Based on IEE Paper Communication Society September 2009, titled Femtocell Standardization in 3GPP. Here are the abstracts, filtched from ltewatch.blogspot.com:

* OFDMA Femtocells: A Roadmap on Interference Avoidance

- The authors provide a coverage and interference analysis based on a realistic OFDMA macro/femtocell scenario, as well as some guidelines on how the spectrum allocation and interference mitigation problems can be approached in these networks. Special attention is paid to the use of self-configuration and self-optimization techniques for the avoidance of interference. David López-Pérez, Alvaro Valcarce, Guillaume de la Roche, and Jie Zhang, University of Bedfordshire

* Standardization of Femtocells in 3GPP

- The UMTS/UTRAN standards community has been undertaking a large-scale and comprehensive effort to specify standards for femtocell devices and systems that are based on the UMTS/HSDPA/HSUPA family of radio access technologies. The authors describe those standardization activities and provide an overview for the femtocell system architecture that has been developed within 3GPP. Douglas N. Knisely, Airvana, Inc.; Takahito Yoshizawa, Thomson Telecom; Frank Favichia, Alcatel-Lucent

* Standardization of Femtocells in 3GPP2

- The cdma2000 standards community has been undertaking a large-scale and comprehensive effort to develop industry standards for femtocell devices and systems based on the cdma2000 family of radio access technologies. The authors describe those standardization activities and provide an overview of the femtocell system architecture that has been developed within 3GPP2. Douglas N. Knisely, Airvana, Inc.; Frank Favichia, Alcatel-Lucent

* WiMAX Femtocell: Requirements, Challenges, and Solutions

- Several standards bodies, such as 3GPP, WiMAX Forum, and IEEE 802.16, have started to develop standard solutions to enable and optimize femtocells operation. However, there are some technical challenges to the success of femtocell technologies that need to be overcome before they can be deployed on large scales. The authors present an overview of WiMAX femtocell requirements, deployment models, and solutions in the near and long terms.Ronny Yongho Kim and Jin Sam Kwak, LG Electronics, Inc.; Kamran Etemad, Intel Corporation

* System Design of cdma2000 Femtocells

- Femtocells extend the cellular network coverage and provide high speed data service inside homes and enterprises for mobiles supporting existing cellular radio communication techniques. They also provide additional system capacity. The authors review the characteristics of cdma2000-based femtocell systems. Pierre Humblet, Balaji Raghothaman, and Anand Srinivas, Airvana Inc.; Srinivasan Balasubramanian, Chirag Patel, and Mehmet Yavuz, Qualcomm Inc.

* Interference Management and Performance Analysis of UMTS/HSPA+ Femtocells

- The authors present interference management techniques for both downlink and uplink of femtocells operating based on 3GPP Release 7 standards (also known as HSPA+). Femtocell carrier selection and femtocell DL Tx power self-calibration are proposed as key interference management methods for downlink. Mehmet Yavuz, Farhad Meshkati, and Sanjiv Nanda, Qualcomm Inc.; Akhilesh Pokhariyal and Nick Johnson, ip.access Ltd.; Balaji Raghothaman and Andy Richardson, Airvana Inc.

* Autonomous Component Carrier Selection:

-Interference Management in Local Area Environments for LTE-Advanced – The authors present extensive network simulation results to demonstrate that a simple and robust interference management scheme, called autonomous component carrier selection, allows each cell to select the most attractive frequency configuration; improving the experience of all users and not just the few best ones, while overall cell capacity is not compromised. Luis G. U. Garcia, Aalborg University; Klaus I. Pedersen and Preben E. Mogensen, Nokia Siemens Networks

* Femtocell Access Control Strategy in UMTS and LTE

- To help the reader understand the motivation behind some concepts introduced in 3GPP Release 8 to support femtocells, the authors outline the general issue of supporting femtocells in pre-Release 8 UMTS networks with pre-Release 8 UE.Assen Golaup, Mona Mustapha, and Leo Boonchin Patanapongpibul, Vodafone Group

* Early Experiences and Lessons Learned from Femtocells

- Indoor coverage improvement, in conjunction with inexpensive (voice) offerings, will enable MOs to compete with and take away voice-call-related revenues from fixed network PTTs and/or VoIP operators. Femtocells constitute a promising solution to address all of the above. George Korinthios, Elina Theodoropoulou, Niki Marouda, Ioanna Mesogiti, Eftychia Nikolitsa, and George Lyberopoulos, COSMOTE — Mobile Communications S.A.

And here are the main problem according 3g4g.blogspot.com post.

Each technology brings its own set of problems and femocells are no exception. There are three important problems that needs to be answered. They are as follows:

• Radio interference mitigation and management: Since femtocells would be deployed in adhoc manner by the users and for the cost to be kept down they should require no additional work from the operators point of view, they can create interference with other femtocells and in the worst possible scenario, with the macro cell. It may not be possible initially to configure everything correctly but once operational, it should be possible to adjust the parameters like power, scrambling codes, UARFCN dynamically to minimise the interference.

• Regulatory aspects: Since the mobiles work in licensed spectrum bands, it is required that they follow the regulatory laws and operate in a partcular area in a band it is licensed. This is not a problem in Europe where the operators are given bands for the whole country but in places like USA and India where there are physical boundaries within the country for the allocation of spectrum for a particular operator. This brings us to the next important point.

• Location detection: This is important from the regulatory aspect to verify that a Femtocell can use a particular band over an area and also useful for emergency case where location information is essential. It is important to make sure that the user does not move the device after initial setup and hence the detection should be made everytime the femto is started and also at regular intervals.

Each technology has it’s own pluses and minuses

Salam…