KR20010029281A - Power control method of packet service using channel shared with RIU and RP in W-CMDA WLL - Google Patents

Abstract

PURPOSE: A method for controlling a shared channel packet service power between an RIU(Radio Interface Unit) and an RP(Radio Port) of a WLL(Wireless Local Loop) is provided to make many RIUs sharing one packet traffic channel use a reverse packet traffic channel by dividing time to each other, and to make each RIU perform power control during a time for transmitting reverse packet data only. CONSTITUTION: If a WLL(Wireless Local Loop) RIU(Radio Interface Unit) requests time slots of a shared packet traffic channel and a packet signal channel, a WLL RP(Radio Port) decides an initial traffic power and transmits the initial traffic power to the WLL RIU(ST11). The WLL RIU controls power of the signal channel relating to an allocated time slot by packet traffic power information, and transmits reverse data to the RP(ST12,ST13). The RP measures a signal strength of the received signal channel, and generates transmission power control information of the WLL RIU, then progresses to the steps 'ST12,ST13'(ST14).

Description

Power control method of packet service using channel shared with RIU and RP in W-CMDA WLL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wideband code division multiple access (CDMA) type wireless local loop (WLL), in which a plurality of terminal stations sharing one packet traffic channel are reversed. The present invention relates to a shared channel packet service power control method between a terminal station and a base station of a W-CDMA WLL which performs power control only at the time of transmitting packet data.

Figure 1 shows a typical W-CDMA WLL base station modem block configuration.

The base station modem unit 10 that performs the CDMA channel related signal processing function in the WLL base station includes a modem 11, a control matching unit 12, a message matching unit 13, and a traffic matching unit 14. The modem 11 performs a demodulation function on the traffic data of the WLL base station, and the control matching unit 12 performs command and state control between the base station control processor and the modem 11 which performs overall control functions inside the WLL base station. It performs a function to match the control signal. The message matching unit 13 performs a function of matching a connection establishment related message between the base station control processor and the modem 11. The traffic matching unit 14 performs a function for matching traffic between the modem 11 and the WLL control station.

As shown in FIG. 2, the modem 11 demodulates packet data transmitted through a radio frequency (RF) link and transmits the demodulated data to the traffic matching unit 14, and measures the strength of a reverse channel signal. A demodulator 11a for generating a power control signal; Modulation that modulates the packet data transmitted from the traffic matching unit 14 to the WLL terminal station via the RF link, and transmits the power control signal generated by the demodulator 11a to the WLL terminal station via the RF link. It consists of a part 11b.

In a circuit mode data service in a W-CDMA WLL system, a base station and a terminal station have one-to-one correspondence while maintaining one traffic channel and one signal channel. Then, power control is performed between the WLL terminal station and the base station through this signal channel.

3 is a flowchart illustrating a power control method between a WLL terminal station and a base station in such a circuit mode data service.

As shown, when the WLL terminal station requests a connection to the WLL base station for data service, the WLL base station allocates one traffic channel and a signal channel to the terminal station and transmits initial power information (ST1). Wow; The second step (ST2) of transmitting, by the WLL terminal station, traffic to the base station after adjusting the power of a signal channel according to the received power information; The base station measures the signal strength of the received signal channel to generate the transmit power control information of the WLL terminal station and then performs a third step ST3 to proceed to the second step ST2.

The power control method between the WLL terminal station and the base station in the circuit mode data service as described above is as follows.

When a WLL radio station unit (RIU) requests a traffic channel and signal channel allocation request for a circuit mode data service to a radio port (RP), the base station transmits one traffic channel and signal channel to the terminal station. And the initial transmission power is determined to transmit the transmission power information to the terminal station (ST1).

The terminal station then receives the transmission power information, assigns it to the terminal station, determines the initial transmission power, and transmits the transmission power information to the terminal station (ST1). The WLL terminal station (RIU) then adjusts the power of the signal channel signal by this initial transmit power and outputs it (ST2). Accordingly, the WLL base station measures the power strength of the signal channel signal from the terminal station, and then determines the transmission power of the terminal station and transmits it to the terminal station. In this way, the terminal station and the base station maintain power in one ms unit while maintaining one signal channel and traffic channel.

However, when a W-CDMA WLL wants to provide not only a circuit mode data service but also a packet mode data service in which one traffic channel is shared by multiple terminal stations, a power control method in a circut mode data service No power control is done.

That is, when multiple terminal stations use one radio channel, power control should be performed separately according to the position or characteristics of the terminal station. Therefore, the base station and the terminal station should perform power control only one-to-one. However, in the packet mode data service, since a single radio channel is shared by several terminal stations, the terminal station and the base station cannot maintain the radio channel one-to-one. Therefore, the power control method of the conventional circuit mode data service becomes difficult.

Accordingly, the present invention has been proposed by the necessity of the prior art as described above, and an object of the present invention is

A terminal station of a W-CDMA WLL that allows a plurality of terminal stations that share one packet traffic channel to perform power control only at the time of transmitting reverse packet data, thereby providing packet mode services so that various services can be provided. The present invention provides a method for controlling a shared channel packet service power between a BS and a base station.

In more detail, since a plurality of terminal stations sharing one traffic channel divide time from each other and use a reverse packet traffic channel, the base station and the terminal station have one-to-one by performing power control during the time of using the reverse packet traffic channel. The present invention provides a method for controlling a shared channel packet service power between a terminal station and a base station of a W-CDMA WLL capable of low power control.

In order to achieve the above object, a method for controlling shared channel packet service power between a terminal station and a base station of a W-CDMA WLL according to the present invention,

When the WLL terminal station requests time slots of the shared packet traffic channel and the packet signal channel, if the WLL base station determines initial packet traffic power to the WLL terminal station, the WLL terminal station receives a signal channel for the allocated time slot. Is adjusted by the initial packet traffic power information, and then reverse data is transmitted to the base station. The base station then measures the signal strength of the received signal channel to generate reverse packet traffic power information and transmits it back to the terminal station. Thus, when a plurality of terminal stations share and use one radio channel by performing power control at a time slot of a allocated time slot, the base station and the terminal station correspond to one-to-one so that power control is performed.

1 is a block diagram of a base station modem in a wireless subscriber network to which the present invention is applied;

2 is a block diagram of a modem block of FIG. 1 in which power control is performed;

3 is a flowchart illustrating a data service power control method using a circuit mode of a conventional W-CDMA WLL system;

4 is a diagram illustrating a structure of one packet traffic channel and a packet signal channel shared by a plurality of terminal stations;

5 is a flowchart showing a method for controlling shared channel packet service power between a terminal station and a base station in a W-CDMA WLL according to the present invention;

<Description of the code | symbol about the principal part of drawing>

10: base station modem section 11: modem

12: control matching unit 13: message matching unit

14: traffic matching section 11a: demodulation section

11b: modulator

Hereinafter, a method of controlling a shared channel packet service power between a terminal station and a base station of the present invention W-CDMA WLL will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 4, the shared channel packet service uses one radio channel (traffic channel and signal channel) shared by a plurality of terminal stations. That is, the first terminal station is allocated an L slot for one packet traffic channel and the packet signal channel, the second terminal station is allocated an K slot, and the packet traffic channel and the packet signal channel are removed at the L slot allocation time. Only one terminal station transmits reverse packet data, and only the second terminal station transmits reverse packet data at the K slot allocation time.

5 is a flowchart illustrating a method for controlling shared channel packet service power between a terminal station and a base station in a W-CDMA WLL according to the present invention.

As shown, when the WLL terminal station requests time slots of the shared packet traffic channel and the packet signal channel, the WLL base station determines and transmits initial packet traffic power to the WLL terminal station (ST11). Wow; The WLL terminal station comprises a second step (ST12, ST13) of transmitting the reverse data to the base station after adjusting the power of the signal channel for the allocated time slot by the received packet traffic power information; The base station measures the signal strength of the received signal channel to generate the transmit power control information of the WLL terminal station, and then performs a third step (ST14) to proceed to the second step (ST12, ST13).

The second steps ST12 and ST13 may include: when the packet traffic power information is transmitted from the base station, checking whether the terminal station is allocated a time slot; If the time slot is allocated as a result of the test, the power of the corresponding time slot of the signal channel and the traffic channel is adjusted according to the received packet traffic power information and then transmitted to the base station, and if the time slot is not allocated, the test returns. Step ST13 is performed.

Referring to the method of controlling the shared channel packet service power between the terminal station and the base station of the W-CDMA WLL according to the present invention as follows.

First, in the case of a packet mode service using a shared traffic channel, the WLL terminal station must be allocated a time slot of the packet traffic channel to transmit a packet. Upon requesting the time slot allocation of the WLL terminal station, the base station determines initial packet traffic power to the terminal station (ST11). When the initial packet traffic power information is received from the base station in this way, the terminal station checks whether a time slot is allocated (ST12). So if the time slot is not allocated, it waits for the initial packet traffic power information reception.

However, if the time slot is allocated as a result of the check, the terminal station transmits a packet using the assigned time slot. At this time, the terminal station uses the packet signal channel for power control during the time slot use time. Therefore, the power of the corresponding time slot of the signal channel is adjusted and output (ST13). Thus, during the reverse packet transmission time using the timeslot, power control is performed in the same way as in the circuit mode. At this time, the remaining terminal stations connected to the same shared channel, that is, the terminal stations not being transmitted, ignore the power control information received in the packet signal channel.

The demodulator 11a in the modem 11 of the base station measures the signal strength of the corresponding timeslot of the reverse packet signal channel. Therefore, it is determined whether the received data has an error or not to increase the transmission power of the terminal station. In this way, the demodulator 11a generates a power control bit and transmits it to the modulator 11b, and the modulator 11b transmits this power control bit to the terminal station (ST14).

Thus, a plurality of terminal stations sharing one packet traffic channel perform power control only at the time of using the reverse packet traffic channel by dividing the time with each other so that the base station and the terminal station correspond one-to-one to perform power control.

As described above, in the method of controlling a shared channel packet service power between a terminal station and a base station of a W-CDMA WLL according to the present invention, a plurality of terminal stations sharing one packet traffic channel are divided in time from each other in a reverse packet traffic channel. Since the terminal station performs power control only at the time of transmitting reverse packet data, the base station and the terminal station can have one-to-one power control, thereby providing packet mode services. .

Claims (2)

A power control method of a packet mode service using a shared radio channel between a W-CDMA WLL terminal station and a base station, A first step of the WLL base station determining and transmitting initial packet traffic power to the WLL terminal station when the WLL terminal station requests a time slot of a shared radio channel; The WLL terminal station further comprises: a step for transmitting reverse data to the base station after adjusting the power of a signal channel for an allocated time slot by the received packet traffic power information; The base station measures the signal strength of the received signal channel and generates transmission power control information of the WLL terminal station, and then performs a third step of proceeding to the second step. A method for controlling shared channel packet service power between base stations. The method of claim 1, wherein the second step, When the packet traffic power information is transmitted from the base station, checking, by the terminal station, whether time slots of a shared packet traffic channel and a packet signal channel are allocated; If the time slot is allocated as a result of the test, the power of the corresponding time slot of the signal channel and the traffic channel is adjusted according to the received packet traffic power information and then transmitted to the base station, and if the time slot is not allocated, the test returns. A method for controlling shared channel packet service power between a terminal station and a base station of a W-CDMA WLL, characterized in that the step of performing the step of performing.