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A method for controlling the transmission power of the reverse common channel for a mobile station in a CDMA communication system. In the method, the mobile station transmits a preamble signal at predetermined periods with increasing transmission power. Upon receipt of an acknowledge signal from a b

A method for controlling the transmission power of the reverse common channel for a mobile station in a CDMA communication system. In the method, the mobile station transmits a preamble signal at predetermined periods with increasing transmission power. Upon receipt of an acknowledge signal from a base station, the mobile station accesses the reverse common channel. In order to avoid multiple mobile stations from simultaneously generating increasingly powerful and interfering transmissions, the method generates two transmission power control signals: one based on the measured strength of a signal received from the base station and the other based on an accumulated value of power control commands transmitted by the base station. These two signals are accumulated and used to control the preamble signal.

대표청구항 ▼

A method for controlling the transmission power of the reverse common channel for a mobile station in a CDMA communication system. In the method, the mobile station transmits a preamble signal at predetermined periods with increasing transmission power. Upon receipt of an acknowledge signal from a b

A method for controlling the transmission power of the reverse common channel for a mobile station in a CDMA communication system. In the method, the mobile station transmits a preamble signal at predetermined periods with increasing transmission power. Upon receipt of an acknowledge signal from a base station, the mobile station accesses the reverse common channel. In order to avoid multiple mobile stations from simultaneously generating increasingly powerful and interfering transmissions, the method generates two transmission power control signals: one based on the measured strength of a signal received from the base station and the other based on an accumulated value of power control commands transmitted by the base station. These two signals are accumulated and used to control the preamble signal. ing system for facilitating purchase transactions via a wireless videophone, the electronic shopping system comprising: a server for storing a purchase transaction program and for facilitating electronic purchase transactions; and at least one wireless videophone for communicating with the server, the wireless telephones comprising: an antenna for receiving a radio frequency signal, the radio frequency signal comprising at least a purchase transaction program; a radio frequency receiver/amplifier coupled to receive the radio frequency signal from the antenna for amplifying the radio frequency signal; a demodulator coupled to receive the amplified radio frequency signal from the radio frequency receiver/amplifier for demodulating the amplified radio frequency signal; a channel decoder coupled to receive a demodulated signal from the demodulator for separating non-speech and non-video digital data from the demodulated signal, the non-speech and non-video digital data comprising the purchase transaction program; a program memory coupled to receive the purchase transaction program from the channel decoder for storing the purchase transaction program; a program loader for downloading a purchase transaction program from the server into the program memory; and a digital camera for taking pictures of visual images representing indicia of items to be purchased and for transmitting visual image data associated with the acquired visual images to the server for indicating the items to be purchased. 6. The electronic shopping system according to claim 5, wherein the server is disposed proximate a store with which purchase transactions are performed. 7. The electronic shopping system according to claim 5, wherein the server is disposed at a location which is remote from the store with which purchase transactions are performed. 8. The electronic shopping system according to claim 5, further comprising an extension PBX in communication with the server for facilitating wireless communication between the server and the wireless videophone(s). 9. The electronic shopping system according to claim 5, wherein the program loader comprises a firmware memory. 10. The electronic shopping system according to claim 5, wherein the program loader comprises a firmware memory, the firmware memory containing instructions which are executed to effect storage in the program memory of the purchase transaction program received by the wireless videophone. 11. The electronic shopping system according to claim 10, wherein the wireless videophone further comprises a microprocessor in communication with the program loader and the program memory for executing the instructions stored within the firmware memory of the program loader and for executing the purchase transaction program stored within the program memory. 12. The electronic shopping system according to claim 5, the wireless videophone further including pattern recognition software, the pattern recognition software recognizing the item indicia and translating the item indicia into a corresponding desired product identification. 13. The electronic shopping system according to claim 12, wherein the item indicia is a bar code, the pattern recognition software translating the bar code data into a numerical product identification. 14. The electronic shopping system according to claim 12, wherein the item indicia is a product specific pattern shape, the pattern recognition software translating the pattern shape data into a numerical product identification. 15. The electronic shopping system according to claim 5, the server configured to host a pattern recognition software program receiving the visual image data associated with the item indicia, the pattern recognition software program further recognizing the item indicia and translating the item indicia into a corresponding desired product identification. 16. The electronic shopping system according to claim 15, wherein the item indicia is a bar code,