Flinto code handoff2/19/2023 The two signals are transmitted to the respective base stations with pilot signals from respective pilot channel sections 102a and 102b included therein. The turbo encoder 101b then outputs two signals encoded with different patterns. The data is then inputted to a turbo encoder 101b, which encodes the data. 1, data to be transmitted to a base station is outputted from a master switch center 101 of a base station controller. If the mobile terminal receives the signals encoded by the same coding method, however, it obtains no gain. According to the CCSH handoff method, several base stations transmit the signals encoded by different coding methods from the various base stations and a mobile terminal receives and combines the signals encoded by the different coding methods to obtain the gain. A receiving part decodes and combines the signals encoded by the different coding methods to obtain a gain. According to the CCSH, one signal is encoded by different coding methods, and resultant coded signals are transmitted. Meanwhile, a high-speed data transmitting system uses a CCSH (also known as a code combining and packet combining) handoff method using turbo coding. According to the softer handoff, one cell is divided into several sectors, and when the mobile terminal in use moves from one sector to another sector within the same base station, the traffic channel is connected in the same manner as the soft handoff. The mobile terminal thus continues the call through the new cell of a good signal state.Ī softer handoff is a handoff between different sectors of one cell. If the strength of this previous signal is lower than a predetermined level, the mobile terminal informs the two cells of this fact, and then the previous cell breaks the communication channel through the mobile station. At this time, the mobile terminal simultaneously maintains communication through the traffic channels of the two cells.Īs the mobile terminal approaches the new cell, the signal of the previous cell becomes weaker. In other words, according to the hard handoff, when a mobile communication terminal (i.e., mobile station) moves from one base station to another base station, the channel connected to the existing base station is broken, and then a new channel of the new base station is connected.Īccording to the soft handoff that is a handoff between cells, when a mobile communication terminal (i.e., mobile station) comes near another cell region having the same frequency while the mobile terminal is in use, the mobile terminal detects and informs the current cell that the signal strength of the pilot signal of a new cell is sufficiently high, and the new cell opens a traffic channel for the mobile terminal with the new base station. The hard handoff first breaks the existing communication channel before opening a new traffic channel, and the soft handoff first connects a new channel and then breaks the existing channel. Such a handoff is typically classified into a hard handoff and a soft handoff. In mobile communications, a handoff is an automatic switchover of the current traffic channel that occurs when a mobile terminal moves from one cell to another cell. The present invention relates to a mobile communication system, and more particularly to a code combining soft handoff (CCSH) method. 10, 2000 whose entire disclosures are incorporated herein by reference.BACKGROUND OF THE INVENTION This application claims the benefit of the Korean Application No. 6,993,338, the entire disclosure of the prior application is hereby incorporated by reference. This is a Continuation Application of prior application Ser.
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