HANDOVER APPARATUS AND METHOD USING RELAY NODE IN CELLULAR SYSTEM

• US 20080085709A1
• Filed: 10/04/2007
• Published: 04/10/2008
• Est. Priority Date: 10/04/2006
• Status: Active Grant

• Current Assignee: Industry Academic Cooperation Foundation, Samsung Electronics Co. Ltd.
• Original Assignee: Industry Academic Cooperation Foundation, Samsung Electronics Co. Ltd.
• Inventors: Jeon, Sungho, Cho, Sung-Hyun, Kwun, Jong-Hyung, Jeon, Young-Hyun, Lee, Sanghoon
• Granted Patent: US 8,059,545 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04B 7/15521 combining by calculations packets received from different stations before transmitting the combined packets as part of network coding network coding aspects for detection or prevention of errors in the information received H04L1/0076; network traffic management with optimizing of information sizing, e.g. header compression, by using assembly and disassembly of packets H04W28/065
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

Handover apparatus and method using a Relay Node (RN) in a cellular system are provided. The handover method includes receiving, at an RN, broadcast control information of a serving Base Station (BS) and a neighbor BS; network-encoding and broadcasting, at the RN, the received broadcast control information; receiving and storing, at a Mobile Station (MS), the broadcast control information of the serving BS; receiving, at the MS, the network-encoded information from the RN when the MS enters a cell overlapping area; and acquiring, at the MS, the broadcast control information of the neighbor BS by decoding the received network-encoded information with the broadcast control information of the serving BS.

Claims

1. A Relay Node (RN) in a cellular system, comprising:

a receiver for receiving broadcast control information of neighbor Base Stations (BSs);

an encoder for network-encoding the received broadcast control information; and

a transmitter for broadcasting the network-encoded information.

2. The RN of claim 1, wherein the receiver comprises:

a Radio Frequency (RF) receiver for converting an RF signal received on an antenna to a baseband signal;

an Orthogonal Frequency Division Multiplexing (OFDM) demodulator for generating frequency-domain data by OFDM-demodulating the signal fed from the RF receiver;

a demodulator for extracting data of the neighbor BSs from the frequency-domain data fed from the OFDM demodulator and demodulating the extracted data; and

a decoder for restoring the broadcast control information of the neighbor BSs by decoding the data fed from the demodulator.

3. The RN of claim 1, wherein the transmitter comprises:

an encoder for encoding the network-encoded information;

a modulator for modulating the data fed from the encoder;

an OFDM modulator for generating time-domain data by OFDM-modulating the data fed from the modulator; and

an RF transmitter for converting the data fed from the OFDM modulator to an RF signal and transmitting the RF signal over an antenna.

4. The RN of claim 1, wherein the broadcast control information of the neighbor BSs is information required for a network reentry of a handed-over Mobile Station (MS).

5. The RN of claim 1, wherein the broadcast control information of the neighbor BSs is Uplink Channel Descriptor (UCD) and Downlink Channel Descriptor (DCD) information.

6. The RN of claim 1, wherein the encoder network-encodes using an exclusive OR (XOR) operation.

7. A Mobile Station (MS) in a cellular system comprising:

a storage for storing broadcast control information of a serving Base Station (BS);

a receiver for receiving network-encoded information broadcast by an Relay Node (RN); and

a decoder for acquiring broadcast control information of a neighbor BS by decoding the network-encoded information received at the receiver using the broadcast control information of the serving BS.

8. The MS of claim 7, wherein the receiver comprises:

a Radio Frequency (RF) receiver for converting an RF signal received on an antenna to a baseband signal;

an Orthogonal Frequency Division Multiplexing (OFDM) demodulator for generating frequency-domain data by OFDM-demodulating the signal fed from the RF receiver;

a demodulator for extracting data of the RN from the frequency-domain data fed from the OFDM demodulator and demodulating the extracted data; and

a decoder for restoring the network-encoded information by decoding the data fed from the demodulator.

9. The MS of claim 7, wherein the broadcast control information is information required for network reentry.

10. The MS of claim 7, wherein the broadcast control information is Uplink Channel Descriptor (UCD) and Downlink Channel Descriptor (DCD) information.

11. A handover apparatus in a cellular system, comprising:

a Relay Node (RN) for receiving broadcast control information of a serving Base Station (BS) and a neighbor BS, network-encoding and broadcasting the received broadcast control information; and

a Mobile Station (MS) for storing the broadcast control information received from the serving BS and acquiring broadcast control information of the neighbor BS by decoding the network-encoded information received from the RN with the broadcast control information of the serving BS.

12. The handover apparatus of claim 11, wherein, when the MS is handed over to the neighbor BS, the MS performs a network reentry procedure using the control information of the neighbor BS.

13. The handover apparatus of claim 12, wherein the broadcast control information is information required for the network reentry.

14. The handover apparatus of claim 11, wherein the broadcast control information is Uplink Channel Descriptor (UCD) and Downlink Channel Descriptor (DCD) information.

15. The handover apparatus of claim 11, wherein the RN network-encodes using an exclusive OR (XOR) operation.

16. A communication method of a Mobile Station (MS) in a cellular system, comprising:

receiving and storing broadcast control information from a serving Base Station (BS);

receiving network-encoded information broadcast by a Relay Node (RN) when the MS enters a cell overlapping area; and

acquiring broadcast control information of a neighbor BS by decoding the network-encoded information using the broadcast control information of the serving BS.

17. The communication method of claim 16, further comprising:

when the MS is handed over to the neighbor BS, performing a network reentry procedure using the acquired broadcast control information of the neighbor BS.

18. The communication method of claim 16, wherein the receiving step comprises:

converting a Radio Frequency (RF) signal received on an antenna to a baseband signal;

generating frequency-domain data by Orthogonal Frequency Division Multiplexing (OFDM)-demodulating the baseband signal;

extracting data of the RN from the frequency-domain data; and

restoring the network-encoded information by demodulating and decoding the extracted data.

19. The communication method of claim 17, wherein the broadcast control information is information required for the network reentry.

20. The communication method of claim 16, wherein the broadcast control information is at least one of Uplink Channel Descriptor (UCD) information, Downlink Channel Descriptor (DCD) information, and Mobile Application Part (MAP) information.

21. A handover method in a cellular system, comprising:

receiving, at a Relay Node (RN), broadcast control information of a serving Base Station (BS) and a neighbor BS;

network-encoding and broadcasting, at the RN, the received broadcast control information;

receiving and storing, at a Mobile Station (MS), the broadcast control information of the serving BS;

receiving, at the MS, the network-encoded information from the RN when the MS enters a cell overlapping area; and

acquiring, at the MS, the broadcast control information of the neighbor BS by decoding the received network-encoded information with the broadcast control information of the serving BS.

22. The handover method of claim 21, further comprising:

performing, at the MS, a network reentry procedure using the acquired broadcast control information of the neighbor BS when the MS is handed over to the neighbor BS.

23. The handover method of claim 21, further comprising:

selecting, at the MS, a handover target BS using the broadcast control information of the neighbor BS.

24. The handover method of claim 22, wherein the broadcast control information is information required for the network reentry.

25. The handover method of claim 21, wherein the broadcast control information is at least one of Uplink Channel Descriptor (UCD) information, Downlink Channel Descriptor (DCD) information, and Mobile Application Part (MAP) information.