- WiMAX standard series:
- Low cost: relay station doesn't need the support of wired-line backhaul which reduces the cost of building backhaul network greatly. And the complexity and cost of relay station is much lower than base station. So although the effect provided may not be as good as adding a cell, it is still very attractive to operator for its low cost and flexibility.
- Selective power amplification: Different from the traditional analog power amplifier to amplify all the received signal, relay station will make digital process for received signal and amplify the power depending on situation. Furthermore, because when the relay station receives the signals, the interfering signals have already been dealt with. So when relaying signals, all the power on the signals needed to be relayed. While the signals don't need to be relayed, interfering signals will not be relayed as well.
- Multi-hop increasing coverage area: many neighboring relay staions can relay signals to farther away areas.
Relay task group has decided that this standard should be realized under the condition without modifying mobile station. Then the mobile station may not be able to recoganize the existance of relay staion. This is also one of the difficulties.
Mobile WiMAX production speeds up:
WiMAX forum plays an important role in WiMAX market. The approval of this forum and other work decide the possible future development and application of WiMAX. Nowadays the main work has totally moved to wireless WiMAX and speeds up to put technology in market. The time of approval and whether it is successful has relation with when the WiMAX devices will be on the market.
The approval of fixed WiMAX devices has started from the beginning of 2006. While because the approval of mobile WiMAX was postponed, it can only start at the end of 2006.
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