Computer And Technologies

Computer And Technologies: Why to develop IEEE802.16j?

Thursday, 23 April 2009

Why to develop IEEE802.16j?

Currently in the point-to-multipoint architecture, wireless communication easily has some hidden places. And the far away users' transmission speed decreases because of the drop of RSSI (Received Signal Strength Indication). IEEE 802.16 standard session started setting up Relay Task Group since the May of 2006 making the standard for supporting mobile user's multi-hop relay technology. The standard is designed to provide the signal relay between base station and mobile station to achieve the purposes of throughput enhancement and coverage extension. The IEEE802.16j is developed based on IEEE802.16e as its amendment.

  • Scope

It specifies OFDMA physical layer and medium access control layer enhancements to IEEE Std 802.16 for licensed bands to enable the operation of relay stations. Subscriber station specifications are not changed.

  • Purpose

The purpose of this amendment is to enhance coverage, throughput and system capacity of 802.16 networks by specifying 802.16 multihop relay capabilities and functionalities of interoperable relay stations and base stations.

  • Reason

The multihop relay is a promising solution to expand coverage and to enhance throughput and system capacity for IEEE 802.16 system. It is expected that the complexity of relay stations will be considerably less than the complexity of legacy IEEE802.16 base station. The gains in coverage and throughput can be leveraged to reduce total deployment cost for a given system performance requirement and thereby improve the economic viability of IEEE802.16 systems. Relay functionality enables repid deployment and reduces the cost of system operation. These advantages will expand the market opportunity for broadband wireless access. This project aims to enable exploitation of such advantages by adding appropriate relay functionality to IEEE Std. 802.16 through the proposed amendment. Stakeholders include manufactures and operators of IEEE 802.16 networks.

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