By Yifei Yuan
LTE-Advanced relay expertise and standardization offers a well timed reference paintings for relay know-how with the finalizing of LTE unlock 10 necessities. LTE-Advanced is readily turning into the worldwide normal for 4G mobile communications. The relay expertise, as one of many key positive aspects in LTE-Advanced, is helping not just to enhance the approach assurance and capability, but additionally to save lots of the prices of laying wireline backhaul. As a number one researcher within the box of LTE-Advanced criteria, the writer offers an in-depth description of LTE-A relay know-how, and explains intimately the normal specification and layout ideas.
Readers from either educational and commercial fields can locate sections of curiosity to them: Sections 2 & four may benefit researchers in academia and those that are engaged in exploratory paintings, whereas Sections three & four are extra helpful to engineers.
Dr. Yifei Yuan is the Technical Director on the criteria division of ZTE Inc.
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Additional resources for LTE-Advanced Relay Technology and Standardization
1 L1 Relay L1 relay features ‘‘amplify-and-forward’’. It simply amplifies the signal (presumably mixed with the interference/noise) from eNB/UE and forward it to the UE/eNB. , the signal is amplified and forwarded across the entire bandwidth. , it would only amplify-and-forward the signal in the target frequency resources, thus causing less interference to the system. The frequencyselective L1 relaying can be achieved purely in RF domain or requires some baseband processing, depending the actual implementation.
The relay locations are randomly shifted away from the planned positions to reflect the real deployment (10 m standard deviation). Two-dimensional antenna pattern is assumed. 2. When the loop interference protection is perfect, the outband configurations exhibit the highest performance, and the inband configurations perform the worst, due to the MBSFN overhead. The impact of MBSFN overhead on the hybrid configurations is lower than on the in-band configurations as only about 50 % of the relayed transmissions is via inband mode.
In the fixed relay deployment, especially for outdoor relays, site optimization can further improve the propagation environment for the wireless backhaul communications. In 3GPP, such improvement comes from the two aspects in channel modeling: less signaling attenuation from the donor eNB, and increased LOS probability of backhaul link. 1 Less Attenuation from Donor eNB A simple method is to add pathloss bonus directly to the connection between the eNB and a RN. Note that the bonus only applies to RNs with NLOS propagation with eNB, and only to the link to its donor eNB.