Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-01-26
2000-07-25
Tsang, Fan
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455434, 455450, 455454, 455464, 455502, 455507, 455515, 370252, 370335, 370342, H04Q 720, H04Q 738
Patent
active
060945761
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a connection establishment method in a radio system including one or more base stations and subscriber terminal equipments, in which system signals to be sent are multiplied by spreading codes, and in which the connection from the base station to the subscriber terminal equipment is synchronized and the subscriber terminal equipment has received the control data of the radio system from the base station and the subscriber terminal equipment sends an access signal to the base station on an access channel.
A radio system comprising one or more base stations and subscriber terminal equipments, in which system signals to be sent are multiplied by spreading codes, and where the connection from the base station to the subscriber terminal equipment is synchronized and the subscriber terminal equipment has received the control data of the radio system from the base station and the subscriber terminal equipment is arranged to send an access signal to the base station on an access channel.
BACKGROUND OF THE INVENTION
A typical cellular radio system, such as the CDMA system (Code Division Multiple Access) comprises a set of subscriber terminal equipments and base stations. When a subscriber terminal equipment does not have a connection on a normal traffic channel, it monitors the paging channel of a base station and when necessary, sends messages on an access channel to the base station. When a connection is established between the subscriber terminal equipment and the base station in a cellular radio system, either the subscriber terminal equipment or the base station sends a connection establishment request. In the CDMA cellular radio system, a specific Random Access Channel (RACH) is used as an access channel on which the subscriber terminal equipment initiates call establishment. The base station responds to the messages of the access channel on an Access Grant Channel (AGCH). In this case one phase is selected from among all the available phases of a pseudonoise code for a random access type connection. When a traffic channel connection is to be established or when responding to a connection establishment request of the base station, the terminal equipments send via the access channel a connection establishment message to the base station which forwards it to other parts of the system, typically to a base station controller where traffic channel resources are allocated to the connection.
In the CDMA system, each base station sends continuously a pilot signal. If the base station has several sectors or beams, each sector or beam of the base station has typically a specific pilot signal. It is previously known to use a pilot signal for identifying a base station, a beam or sector of the base station. A pilot signal is a spread-coded signal without data modulation which signal each base station sends continuously to its coverage area. The terminal equipment may identify the base station transceiver units by the pilot signal because the phases of the spreading codes in the pilot signal differ from one another. The subscriber terminal equipments carry out measurings of pilot signals continuously.
In a typical CDMA system using direct sequence, the transmitter and the receiver have to be synchronized so that the sequence of the received signal and the sequence of the local oscillator are in the same phase. Continuous code channels, such as the pilot channel, can be used for synchronization in the direction of transmission from the base station to the subscriber terminal equipment. The subscriber terminal equipment can search for the code phase and thus synchronize to the transmission of the base station. In the opposite direction of transmission from the subscriber terminal equipment to the base station, the subscriber terminal equipment starts the transmission and the base station searches for the code phase. In the direction of transmission from the subscriber terminal equipment to the base station a problem is caused by the distance of the subscriber terminal equi
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patent: 5715236 (1998-02-01), Gilhousen et al.
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Hakkinen Hannu
Honkasalo Zhi-Chun
Keurulainen Jere
Rinne Mikko
Virtanen Anu
Ferguson Keith
Nokia Telecommunications Oy
Tsang Fan
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