Method and system for implementing mobile relay
A method for implementing mobile relay station is provided. The method includes performing spectrum sensing at least one spectrum sensing entity in a base station, a mobile relay station and a user terminal, sending, by the spectrum sensing entity, the result of spectrum sensing to a spectrum managing entity in the mobile communication system, allocating, by the spectrum managing entity available spectrum to a first link between the mobile relay station and the base station and allocating, by the spectrum managing entity, the available spectrums to a second link between the mobile relay station and the user terminal as working spectrum. The present invention also provides a mobile relay station system. The present invention can solve the problem of capacity bottleneck in the backhaul links and access links in high speed wireless environment.
1. A method for operating a mobile relay station in a mobile communication system, the method comprising:
performing, by the mobile relay station, spectrum sensing of available frequency bands,
classifying the available frequency bands into a plurality of spectrums comprising first available spectrums and second available spectrums;
allocating, by the mobile relay station, the first available spectrums to a first link between the mobile relay station and a base station as first working frequency bands;
allocating, by the mobile relay station, the second available spectrums to a second link between the mobile relay station and a user terminal as second working frequency bands; and
transmitting, by the mobile relay station, information on the first working frequency bands to the base station and the second working frequency bands to the user terminal.
2. The method of claim 1 ,
wherein a working frequency of the mobile communication system is f 0 , and
wherein the method further comprises after transmitting the information on the first working frequency bands and second working frequency bands:
establishing, by the mobile relay station, a link with the base station in the allocated first working frequency band, and
establishing, by the mobile relay station, a link with the user terminal in the allocated second working frequency band.
3. The method of claim 1 , wherein the mobile relay station performs the spectrum sensing periodically or when triggered by an event according to configurations in the base station.
4. The method of claim 1 , wherein the spectrum sensing performed by the mobile relay station comprises at least one of single node spectrum sensing, cooperative spectrum sensing, and geolocation spectrum sensing using a database.
5. The method of claim 1 , wherein the allocating of the first available spectrums and the second available spectrums to the first link and to the second link comprises:
allocating and managing available frequency bands according to user service requirements, a distribution of the available frequency bands, and conditions of interferences.
6. The method of claim 1 , further comprising:
after a handover of the mobile relay station, re-performing the spectrum sensing and spectrum managing, and
exchanging, by adjacent base stations, information on available frequency bands via an X2 interface.
7. The method of claim 1 , further comprising:
transmitting data simultaneously, between the base station and the mobile relay station and between the mobile relay station and the user terminal, via multiple allocated working frequency bands through spectrum aggregation.
8. The method of claim 1 , further comprising:
monitoring, by the mobile relay station, access techniques in surrounding circumstances on a frequency band being sensed, and
selecting, by the mobile relay station, an access technique in an allocated working frequency band.
9. An apparatus of a mobile relay station in a mobile communication system, the system comprising:
a spectrum sensing entity configured to perform spectrum sensing of available frequency bands; and
a spectrum managing entity configured to:
classify the available frequency bands into a plurality of spectrums comprising first available spectrums and second available spectrums,
allocate the first available spectrums to a first link between the mobile relay station and a base station as first working frequency bands,
allocate the second available spectrums to a second link between the mobile relay station and a user terminal as second working frequency bands, and
transmit information on the first working frequency bands to the base station and the second working frequency bands to the user terminal.
10. The apparatus of claim 9 ,
wherein a working frequency of the system is f 0 , and
wherein the spectrum managing entity is configured to, after the transmission of the information on the first working frequency band and the second working frequency band:
establish, between the mobile relay station and the base station, a link in the allocated first working frequency band, and
establish between the mobile relay station and the user terminal, a link in the allocated second working frequency band.