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Method of efficiently transmitting data during a handover in a wideband radio access network

A technology of radio access network and wireless connection, which is applied in the direction of radio/inductive link selection arrangement, wireless communication, data exchange network, etc., and can solve problems such as long transmission delay

Inactive Publication Date: 2005-11-02
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to real-time traffic, retransmissions involve a round-trip delay for the MS-NodeB-RNC connection and require long transmission delays

Method used

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  • Method of efficiently transmitting data during a handover in a wideband radio access network
  • Method of efficiently transmitting data during a handover in a wideband radio access network
  • Method of efficiently transmitting data during a handover in a wideband radio access network

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0056] First embodiment - Uplink transmission with ARQ

[0057] Figure 5 An ARQ-based uplink transmission process according to an embodiment of the present invention is described. see Figure 5 , in step 5, the MN sends the packet data to multiple RARs. As mentioned above, packet data is passed on the uplink to the PRAR and SRAR. exist Figure 5 , send data to one PRAR and two SRARs.

[0058] Each RAR (PRAR or SRAR) receives uplink packet data and notifies the MN whether the reception is normal or not. If the RAR normally receives the uplink packet, then at step 6, it sends an ACK (acknowledgment) signal to the MN on a predetermined downlink channel. However, if normal reception fails, at step 6, the RAR sends a NACK signal to the MN. exist Figure 5Among them, only one SRAR normally receives the uplink packet data and feeds back an ACK signal, while the other SRAR and PRAR fail to receive the uplink packet data and feed back a NACK signal. If the MN receives neith...

no. 2 example

[0066] Second embodiment - downlink transmission by means of ARQ(1)

[0067] Figure 6 Downlink data transmission by means of ARQ according to another embodiment of the present invention is illustrated. see Figure 6 , in step 5, the packet data received from the external network through the HA, the LGW, and the first intermediate router (IR) (IR1) is sent to the MN through the PRAR. The PRAR is tunneled to one or more SRARs in handover. Therefore, PRAR forwards the received data to SRAR. Actually, packet data is sent to the MN through PRAR and SRAR.

[0068] More specifically, the data sent from the CN to the PRAR is simultaneously sent to the MN via the SRAR and the PRAR on the downlink, which is synchronized in step 6 . As described in the first embodiment of the present invention, the number of retransmissions is determined according to the delay bound, and the number of ARQ occurrences is determined according to the number of retransmissions.

[0069] The MN check...

no. 3 example

[0072] Third embodiment - downlink transmission with ARQ(2)

[0073] Figure 7 A downlink data transmission process by means of ARQ according to another embodiment of the present invention is described. see Figure 7 , the packet data received from the external network through the HA, LGW, and IR1 is sent to the MN through the RAR with the best channel state among the plurality of RARs. In step 5, the MN calculates the SNR of the pilot signals received from the PRAR and SRAR in the handover, and in step 6 selects the RAR with the highest SNR, and reports the selection to the plurality of RARs.

[0074] The PRAR that has received the packet data for the MN from the CN forwards the packet data to the selected RAR at step 7 . At step 8, the selected RAR sends packet data to the MN on the downlink.

[0075] The MN then checks for errors in the received packet data. If the packet data is normal, then in step 9, the MN sends an ACK signal to the selected RAR. However, if the...

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Abstract

A wideband radio access network system in which a predetermined mobile node (MN) is wirelessly connected to a core network (CN) through a first intermediate router (IR) and a second IR neighboring the first IR is tunneled to the first IR, to transmit data from the MN to the CN through at least one IR. The MN transmits data to the first and second IRs, and if at least one IR receives the data normally, the at least one IR transmits the received data to the CN through the first IR.

Description

technical field [0001] The present invention relates generally to broadband radio access networks, and more particularly to methods of efficiently transmitting and receiving data during mobile station (MS) handovers. Background technique [0002] Since the United States introduced the cellular mobile telecommunication system in the late 1970s, Korea started voice communication services in the first generation (1G) analog mobile telecommunication system, AMPS (Advanced Mobile Phone Service), and developed the second generation ( 2G) mobile telecommunication system and put into commercial use in the mid-1990s, and partly equipped with the 3rd generation (3G) mobile telecommunication system, IMT-2000 (International Mobile Telecommunications-2000), which aims to be launched in the late 1990s Perform advanced wireless multimedia and high-speed data services. [0003] Now, mobile communication technology is transitioning from a 3G mobile telecommunication system to a 4th generati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L12/56H04W36/10H04W36/18
CPCH04W36/18H04W36/10H04W36/00692A47K3/06
Inventor 都美仙金映秀尹相普赵成贤李相勋朴元亨
Owner SAMSUNG ELECTRONICS CO LTD