Method and arrangement for establishing a connection between a base station and mobile station
First Claim
1. A method for establishing a connection between a mobile station and base station where extended timing advance is used in traffic data transmission and where the mobile station transmits to the base station an access burst (CHANNEL REQUEST, HANDOVER ACCESS), characterized in thatthe access burst is transmitted using a first timing advance value, transmission from the base station is monitored in order to identify a response message (IMMEDIATE ASSIGNMENT, PHYSICAL INFORMATION), and if no response message is received from the base station the access burst is transmitted using a second timing advance value, whereby said first and second timing advance values are different from each other and at least one of said two timing advance values differs from zero.
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Accused Products
Abstract
The invention relates to a method and arrangement for establishing a connection between a base station and mobile station. The invention is especially applicable to digital TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access) cellular systems which use extended cell operating ranges. An idea of the invention is that when establishing a connection a mobile station transmits access bursts using a preferably extended timing advance different from zero. In one embodiment, different timing advance values are used until a timing advance is found with which the burst falls on a CCCH channel time slot at the base station. The mobile station preferably transmits the first bursts using the normal timing advance, the next bursts using a second timing advance, the corresponding timing advance parameter value being the normal timing advance parameter maximum value+1, and the subsequent bursts using a timing advance of 2×the second timing advance, etc. This goes on until a response message arrives from the base station or until the mobile station has gone through the whole legal timing advance range. Using the solution according to the invention, extended cells can be realized without substantially reducing the data transmission capacity of cells.
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Citations
24 Claims
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1. A method for establishing a connection between a mobile station and base station where extended timing advance is used in traffic data transmission and where the mobile station transmits to the base station an access burst (CHANNEL REQUEST, HANDOVER ACCESS), characterized in that
the access burst is transmitted using a first timing advance value, transmission from the base station is monitored in order to identify a response message (IMMEDIATE ASSIGNMENT, PHYSICAL INFORMATION), and if no response message is received from the base station the access burst is transmitted using a second timing advance value, whereby said first and second timing advance values are different from each other and at least one of said two timing advance values differs from zero.
- 16. A cellular system comprising processing, memory and signaling means for changing a serving base station in a time-division cellular network where extended timing advance is used in the traffic data transmission between the base station and mobile station and where the system comprises means for receiving an access burst (CHANNEL REQUEST, HANDOVER ACCESS) from the mobile station, characterized in that the base station comprises means for receiving an access burst that has a timing advance value different from zero.
- 21. A mobile station comprising means for establishing a connection between the mobile station and base station in a cellular network, where extended timing advance is used in the traffic data transmission between the base station and mobile station and where the mobile station comprises means for transmitting an access burst (CHANNEL REQUEST, HANDOVER ACCESS) to the base station, characterized in that the mobile station comprises means for transmitting an access burst that has a timing advance value different from zero, means for receiving from the base station a response message for an access burst and means for changing the value of the timing advance of the access burst if it does not receive a response message from the base station.
Specification