5 Research Areas to Augment Broadband Wireless Access Networks
Currently, the wireless and mobile technology is experiencing considerable growth, a tremendous paradigm shift in design methodology, and significant enhancement in the performance and efficiency of mobile broadband wireless access technologies, on both professional and general front. Indeed, the increasing demand for several wireless data and multimedia applications, mobile Internet, and enhanced quality and higher efficiency of wireless networks has enticed the attention of the worldwide research community and has become a prime concern for the standards development organizations.
In order to shift the broadband access to rural and remote areas where there is no network infrastructure, broadband wireless access is now considered a promising alternative with easy availability of low cost wireless equipment hardware, newly freed spectrum and the continuous development in communication technology. And WOBAN, Wireless Optical Broadband Access Networks is well-known as good broadband wireless access architecture.
What are the Enhancement Proposals?
Continuous research efforts are being made to enhance broadband wireless access networks from different aspects. So let us walk you through some of the research efforts-
Management for Large Scale Broadband Wireless Access
Expanding the reach of the Internet to the next billion people would ultimately lead to broadband wireless access networks of very large scale. Apart from the wide range of parameters and environmental phenomenon that affect network function, BWA networks are essentially difficult and intricate to manage. Therefore, in order to manage large scale BWA networks, network management is very crucial. And also, it is a primary requirement to simplify the specification of management goals for an effective distributed management system.
Relay Station Placement
Bandwidth and channel interference limit the kind of perspectives that focuses on maximum utilization of resources. But on the contrary, co-operative relaying has been seen as one of the effective solutions to meet the rigid requirement of enhancing the capacity for broadband wireless access. Deploying relay stations can enhance the quality of wireless channels. Therefore, placing relay stations can help deal with the legacy problems existing in the current wireless network.
Bandwidth Allocation for TCP
In IEEE 802.16 networks, ACKs are transmitted uplink over a unilateral connection that is different from the downlink TCP flow. As a result of which, it increases the round trip delay of the TCP flows because extra bandwidth needs to be allocated for the ACK connection. According to simulation results, the entire allocation scheme can help augment TCP throughput up to 40%.
Adaptive P2P Approach for Subscriber Station
According to IEEE 802.16 networks, the Point-to-Multipoint (PMP) mode is a well-embraced type of transmission. In PMP mode, the base station (BS) acts as the centralized co-coordinator that controls and forwards the packets for the subscriber stations (SS). However, when two subscriber stations begin to exchange packets, the base station is still required to reroute the packets. So in order to save additional communication bandwidth because of rerouting, the Adaptive Point-to-Point Communication (APC) to establish a direct communication between subscriber stations in the PMP mode.
- Performance Comparison for 4G
The three most workable multiple access techniques proposed for 4G wireless communication systems include:
- Orthogonal Frequency and Code Division Multiplexing (OFCDM)
- Orthogonal Frequency Division Multiplexing (OFDM)
- Multi-Carrier Code Division Multiple Access (MC-CDMA)
In OFDM, the user data are seen as a uniform stream of bits and are converted into parallel sub-streams of bits. And at the end, cyclic prefix is added before the OFDM symbols are generated.
But energy and cost-effectiveness is a serious issue concerning the broadband wireless access implementation. However, the green WOBAN proposal points at selectively putting ONUs to sleep in order to minimize the energy wasted because of low utilization during low traffic hours.