KR100724866B1 - Apparatus and method for gating transmitting reverse physical layer channel in mobile communication system - Google Patents

Abstract

A terminal device according to the present invention comprises: a baseband modem unit for generating a reverse physical layer channel signal, and converts the physical layer channel signal from the baseband modem unit into a signal of a high frequency band, and converts the signal of the high frequency band into a power; The transmitting section and the non-transmitting section of the reverse physical layer channel signal are determined according to the RF unit for amplifying and transmitting, and the interruption start point and the interruption rate, and are provided to the baseband modem unit and the RF unit in the non-transmitting section. And a control unit for controlling intermittent transmission of the reverse physical layer channel signal by cutting off power.

IS-2000 1xEV, gating, slotted mode, reverse physical layer channel, pilot, MAC, power saving

Description

Apparatus and method for intermittent physical layer channel intermittent transmission in mobile communication system {APPARATUS AND METHOD FOR GATING TRANSMITTING REVERSE PHYSICAL LAYER CHANNEL IN MOBILE COMMUNICATION SYSTEM}             

1 is a diagram illustrating a reverse physical layer channel transmission structure in a mobile communication system according to the prior art.

2 is a diagram illustrating a structure of a reverse physical layer channel intermittently transmitted in a mobile communication system according to the related art.

3 is a diagram illustrating a structure of a reverse link transmitter for intermittently stopping signal transmission for a part of a frame of a reverse physical channel in a mobile communication system according to an embodiment of the present invention.

4 is a diagram illustrating a control procedure for intermittent transmission of a reverse physical channel in a mobile communication system according to an embodiment of the present invention.

5 is a diagram illustrating a structure of a reverse physical layer channel transmitted intermittently when an interruption rate is 1/2 in a mobile communication system according to an embodiment of the present invention (1frame = 26.67 ms).

FIG. 6 is a diagram illustrating a structure of a reverse physical layer channel transmitted intermittently when an interruption rate is 1/4 in a mobile communication system according to an embodiment of the present invention (1frame = 26.67ms).

7 is a diagram illustrating a structure of a reverse physical layer channel intermittently transmitted when an interruption rate is 1/2 in a mobile communication system according to an embodiment of the present invention (1frame = 20ms).

8 is a diagram illustrating a structure of an uplink physical layer channel intermittently transmitted when an interruption rate is 1/3 in a mobile communication system according to an embodiment of the present invention (1frame = 20ms).

9 is a diagram illustrating a structure of an uplink physical layer channel intermittently transmitted when an interruption rate is 1/4 in a mobile communication system according to an embodiment of the present invention (1frame = 20ms).

The present invention relates to an intermittent transmission apparatus and method of a mobile communication system, and more particularly, to an apparatus and method for intermittently transmitting a reverse physical layer channel.

In general, a reverse physical layer channel includes a pilot channel, a traffic channel, an associated signaling channel, and the like. For example, the reverse physical layer channel of the IS-2000 1xEV standard consists of a pilot channel, a medium access channel (MAC) channel, and a traffic / control channel. Each channel is transmitted in a frame unit of 26.67ms length, and it is determined whether to allocate a channel according to the operation state. The pilot channel is used for synchronous demodulation of a reverse physical layer channel at a base station. The MAC channel is composed of an RRI channel and a DRC channel. The Reverse Rate Indicator (RRI) channel indicates a data rate transmitted on the reverse link and is used for synchronization of a frame consisting of 16 slots. The data rate control (DRC) channel is a channel for reporting a data rate determined by measuring the C / I of the forward link pilot signal.

In the IS-2000 1xEV system, a pilot and a DRC are continuously reported to a base station while a data service is connected. Therefore, for high speed data transmission, the DRC information transmitted on the reverse link must be reported accurately. However, as shown in FIG. 1, since each user continuously reports the DRC and the DRC to the base station continuously and multiplexed for each slot, mutual interference between the DRC channel and the pilot channel occurs. If the base station does not correctly detect the DRC, the base station may not accurately schedule the data rate and sector required by the terminal, and this problem may prevent the service of new users. In other words, as the number of users increases, it becomes more difficult for the base station to detect the DRC and thus cannot serve a new user. In order to solve the above problems, a technique for intermittently transmitting a DRC channel has been proposed.

FIG. 2 illustrates a transmission structure of a MAC channel in the prior art when intermittently transmitting a reverse physical layer channel (or operating in a slotted mode) in the cdma2000 1xEV standard. It is assumed here that the interruption rate is 1/4. In this case, users are grouped into four groups. Each user is informed of the interruption rate (= 1/4) and the slot start point through a signaling message transmitted from the base station.

As shown, the first user group (UG-1) intermittently transmits the DRC channel according to a given intermittent rate using the first slot as a starting point, and the second user group (UG-2) starts the second slot as a starting point. In this case, the DRC channel is intermittently transmitted according to the given interruption rate. The third user group UG_3 and the fourth user group UG_4 perform intermittent transmission using the third slot and the fourth slot as starting points, respectively. The base station determines the data rate of the user and the forward link to provide a service using the intermittently transmitted DRC information.

That is, as described above, the terminal measures the state of the transport channel using a forward physical layer channel, and transmits an appropriate data rate of the forward physical layer channel to the base station through the reverse physical layer channel. The MAC rate data rate control (DRC) channel is used for this purpose. When the MAC channel operates in the slot mode, a DRC message is transmitted once every N slots, and only pilot signals are transmitted in the remaining slots to be used for synchronous demodulation of the uplink physical layer channel. In such a reverse physical layer channel structure, the RF unit and the power amplifier of the terminal transmitter must be turned on to transmit the DRC message even when there is no reverse traffic data. The power amplifier of the terminal transmitter shows a big difference between the basic current consumption when it is in the power-on state and in the power-off state. That is, even when there is no reverse traffic data, since the RF unit and the power amplifier are turned on in the terminal transmission unit, there is a problem of unnecessary power consumption.

Accordingly, an object of the present invention is to provide an apparatus and method for intermittently transmitting a reverse physical layer channel in a mobile communication system.

Another object of the present invention is to provide an apparatus and method for reducing power consumption of a terminal by intermittently transmitting a reverse physical layer channel in a mobile communication system.

Another object of the present invention is to provide an apparatus and method for intermittently transmitting a reverse physical layer channel by turning on / off a power provided to a baseband modem and an RF unit in a mobile communication system.

Another object of the present invention is to provide an apparatus and method for intermittently transmitting a reverse pilot channel in a mobile communication system.

Another object of the present invention is to provide an apparatus and method for intermittently transmitting a reverse physical layer in a slot unit in a mobile communication system.

Another object of the present invention is to provide an apparatus and method for intermittently transmitting two channels simultaneously in a state in which a reverse traffic channel and a pilot channel are simultaneously connected in a mobile communication system.

According to a first aspect of the present invention for achieving the above objects, a baseband modem unit for generating a reverse physical layer channel signal by the terminal device, and the physical layer channel signal from the baseband modem unit into a signal of a high frequency band. An RF unit for converting and power-amplifying the high-frequency band signal, and transmitting and non-transmitting sections of the uplink physical layer channel signal according to a given interruption starting point and interruption rate, and the base station in the non-transmitting period. And a control unit for controlling intermittent transmission of the reverse physical layer channel signal by cutting off power provided to a band modem unit and the RF unit.

According to a second aspect of the present invention, there is provided a method for intermittently transmitting a layer physical layer channel intermittent transmission of a terminal, the method comprising: receiving a signaling message including an interruption start point and an interruption rate information from a base station; Determining a transmission interval and a non-transmission interval of a reverse physical layer channel according to the determined start point and the interruption rate, transmitting the reverse physical layer channel in the transmission period, and baseband in the non-transmission interval. And intermittently transmitting the reverse physical layer channel by cutting off power provided to a modem unit and an RF unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the following description, " interruption rate " represents a period for intermittently transmitting a reverse physical layer channel. If the interruption rate is 1/4, the user (terminal) transmits the reverse physical layer channel once every four slots. Herein, in the case of an IS-2000 1xEV system, the reverse physical layer channel means a pilot channel and a MAC channel. Also, a "user group" refers to a set of users transmitting reverse physical layer channels at the same intermittent rate. Users belonging to a specific user group have the same physical layer channel transmission start point in a frame.

Basically, the present invention does not transmit a reverse physical layer channel in a time interval in which reverse traffic data and a DRC message do not exist (gating off). That is, the power consumption of the terminal is prevented by blocking the current flow inside the terminal.

3 illustrates a structure of a reverse link transmitter according to an embodiment of the present invention. In particular, FIG. 3 shows a reverse link structure of an IS-2000 1xEV system. Largely, the baseband modem unit 10, the RF unit 20, the controller 30 and the power supply unit 40.

First, referring to the baseband modem unit 10, the multiplier 301 multiplies the pilot channel data by a predetermined orthogonal code (W _o ⁴ ) and outputs the orthogonal spread. The quadrature modulator 302 outputs a symbol by performing an eight-ary quadrature modulation on a reverse rate indicator (hereinafter referred to as RRI). The symbol repeater 303 repeatedly outputs the symbol from the quadrature modulator 302 a predetermined number of times. The multiplier 304 multiplies the output of the symbol repeater 303 by the predetermined orthogonal code _WO ⁴ and outputs the orthogonal spread.

The encoder 305 outputs (8,4,4) block encoding of 4-bit DRC information. The iterator 306 repeatedly outputs the output codeword from the encoder 305 a predetermined number of times. The multiplier 307 multiplies the output from the repeater 306 by the orthogonal code W ₀ ² of a given length and outputs the orthogonal spread. The Walsh cover unit 308 inputs a DRC Walsh cover index to output the sector separation Walsh cover. The multiplier 309 multiplies the output of the multiplier 307 by the output of the Walsh cover unit 308 and outputs the multiplier. The multiplier 310 multiplies the output of the multiplier 309 by the predetermined orthogonal code _WO ⁴ and outputs the multiplier. The multiplexer 311 times-multiplexes the outputs of the multipliers 301, 304, and 310.

The encoder 312 encodes and outputs the input traffic data. The modulator 313 outputs the output from the encoder 312 by BPSK modulation. The interleaver 314 interleaves and outputs the output of the modulator 313. The gain regulator 315 adjusts the output of the interleaver 314 and outputs the gain. The multiplier 316 multiplies the output of the gain regulator 315 by the orthogonal code (W ₂ ⁴ ) having a predetermined length of 4 and outputs the multiplier. The complex spreader 317 multiplies and outputs the output of the multiplexer 311 (I channel signal) and the output of the multiplier 316 (Q channel signal) by a predetermined PN code.

Next, referring to the RF unit 20, the filters 318 and 319 filter and output the outputs (I and Q channel signals) of the complex spreader 317, respectively. Gain regulators 320 and 321 gain-adjust the outputs of the corresponding filters 318 and 319, respectively. The phase shifter 324 outputs a 90 degree phase shift of the carrier cos (2πfct) signal. The mixer 322 multiplies the output of the gain adjuster 320 by the carrier cos (2πfct) and outputs a high frequency band signal. The mixer 323 multiplies the output of the 321 and the output of the phase shifter 324 to output a high frequency band signal. The adder 325 adds and outputs the outputs of the mixer 322 and the mixer 323. A power amplifier 326 power-amplifies and outputs the output of the adder 325. The amplified signal is transmitted to the base station through the antenna.

The baseband modem 10 and the RF unit 20 as described above are all controlled by the controller 30 and driven by the power supplied from the power supply unit 40. In particular, according to the present invention, the controller 30 analyzes the signaling message received from the base station and finds the interruption rate and the starting point for intercepting the reverse physical layer channel. Then, the intermittent physical layer channel is intercepted with the interception rate and the starting point. In the present invention, the intermittent transmission is controlled by controlling the power supply unit 40. That is, the controller 30 controls the power supply unit 40 to cut off the driving power provided to each unit during the period in which the reverse physical layer channel is not transmitted (hereinafter, referred to as an off period). That is, the power supply unit 40 cuts off the power provided to the RF unit 20 as well as the baseband modem 10 during the off period.

On the other hand, the signaling message can be configured as shown in Table 1, for example.

Message ID Message Sequence SlotMode SlotRate Slat point

In Table 1, a field for identifying the type of the "Message ID" message, "Message Sequence" is a field indicating the sequence number of the message, "SlotMode" is a field indicating whether or not to crack, the "SlotRate "Is a field indicating the interruption rate, the" Starting Point "is a field indicating the starting slot to start the interruption.

4 is a flowchart illustrating a control procedure of a terminal for intermittently transmitting a reverse physical layer channel according to an embodiment of the present invention.

Referring to FIG. 4, first, in step 401, the controller 30 checks whether a signaling message shown in Table 1 is received. If the signaling message is received, the controller 30 proceeds to step 403 to analyze the received message, otherwise proceeds to step 411 to perform a corresponding function.

After analyzing the message, the controller 30 checks whether the content of the message requires an intermittent mode of a reverse physical layer channel in step 405. Here, the reverse physical layer channel means a pilot channel and a MAC channel.

If the intermittent mode of the uplink physical layer channel is requested, the controller 30 proceeds to step 407 and controls each device with the interruption start point information and the interruption rate information included in the message. In detail, the controller 30 controls the power supply unit 40 for intermittent transmission of the physical layer channel to cut off power provided to the baseband modem unit 10 and the RF unit 20 during the gating off period. That is, because the power supply is cut off, the terminal does not transmit any signal during the off period. If the content of the message does not require the intermittent mode, the controller 30 proceeds to step 409 and continuously transmits the reverse physical layer channel as shown in FIG. 1.

5 and 6 are based on a frame having a time interval of 26.67 ms according to an embodiment of the present invention, and shows a transmission structure for intermittently transmitting a reverse physical layer channel when there are four user groups. 5 is a gating rate 1/2, and FIG. 6 is a 1/4 rate.

Referring to FIG. 5, since the interruption rate is 1/2, the user (terminal) transmits a channel signal once every two slots. Here, the base station allocates the first slot of the frame to the first user group UG_1 as the interruption start point, and assigns the second slot of the frame to the second user group UG_2 as the interruption start point. In addition, the third slot is assigned to the third user group UG_3 as the interruption start point, and the fourth slot is assigned to the fourth user group UG_4 as the interruption start point. Therefore, the users belonging to the first user group intermittently transmit the reverse physical layer channel from the first slot according to the given interruption rate (1/2). Here, for example, the users transmit the DRC channel and the pilot channel together in the odd-numbered transmitting section, and transmit only the pilot channel in the even-numbered transmission section. In addition, the baseband modem unit and the RF unit are turned off for non-transmitting (gating off) sections. On the other hand, since the pilot channel is required for the synchronous demodulation of the uplink physical layer channel in the base station, the pilot estimation of the off-period is used by interpolating the pilot estimate of the whole-period. Meanwhile, the users of the second, third and fourth user groups also intermittently transmit the reverse physical layer channel in the same manner as in the first user group. However, the starting point for enforcement differs depending on the group.

Referring to FIG. 6, since the interruption rate is 1/4, the user (terminal) transmits the channel signal once every four slots. Here, the base station allocates the first slot of the frame to the first user group UG_1 as the interruption start point, and assigns the second slot of the frame to the second user group UG_2 as the interruption start point. In addition, the third slot is assigned to the third user group UG_3 as the interruption start point, and the fourth slot is assigned to the fourth user group UG_4 as the interruption start point. Accordingly, the users belonging to the first user group intermittently transmit the reverse physical layer channel from the first slot according to the given interruption rate (1/4). In addition, the baseband modem unit and the RF unit are turned off for non-transmitting (gating off) sections. Users of the second, third and fourth user groups also intermittently transmit the reverse physical layer channel as in the first user group described above. However, the starting point for enforcement differs depending on the group. On the other hand, since the pilot channel is required for the synchronous demodulation of the uplink physical layer channel in the base station, the pilot estimation of the off-period is used by interpolating the pilot estimate of the whole-period. In FIG. 6, even when the pilot channel of even-numbered whole sections is not transmitted, the power saving effect can be expected more. However, in this case, due to the lack of accuracy of the interpolated pilot estimate, the synchronization demodulation performance for the reverse physical layer channel may be degraded. Therefore, if the intermittent rate is selected and used in consideration of the wireless environment between the base station and the terminal, the efficiency can be improved.

7 to 9 are based on a frame having a time interval of 20 ms according to an embodiment of the present invention, and shows a transmission structure for intermittently transmitting a reverse physical layer channel when there are three user groups. In the case of FIGS. 7 to 9, it is assumed that the system continuously transmits a pilot channel as in the cdma2000 1x system. 7 is a gating rate of 1/2, FIG. 8 is a 1/3 rate, and FIG. 9 is a 1/4 rate.

Referring to FIG. 7, since the interruption rate is 1/2, the user (terminal) transmits a channel signal once every two slots. Here, the base station allocates the first slot of the frame to the first user group (UG_1) as the intermittent start point, and assigns the second slot of the frame to the second user group (UG_2) as the intermittent start point, and the third user group (UG_3). ), The third slot is assigned as the start point. Accordingly, the users belonging to the first user group intermittently transmit the reverse physical layer channel from the first slot according to the given interruption rate (1/2). In addition, the baseband modem unit and the RF unit are turned off for non-transmitting (gating off) sections. Meanwhile, the users of the second and third user groups also intermittently transmit the reverse physical layer channel like the first user group described above. However, the starting point for enforcement differs depending on the group. On the other hand, since the pilot channel is required for the synchronous demodulation of the uplink physical layer channel in the base station, the pilot estimation of the off-period is used by interpolating the pilot estimate of the whole-period.                     

8 and 9 and like FIG. 7, the users belonging to each group intermittently transmit the reverse physical layer channel according to a given enforcement rate.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention intercepts a part of the frame of the reverse physical layer channel in a slot unit consisting of 2048 chips, and during the non-transmission interval, not only the baseband modem of the terminal. Rather, it completely cuts off the power of the RF power amplifier and has the effect of power saving. During the call, the power consumption of the reverse RF and power amplifier accounts for more than half of the total power consumption of the handset, reducing the power consumption of this section and extending the talk time by at least 1.5 times.

Claims (14)

A baseband modem unit for generating a reverse physical layer channel signal; A radio frequency (RF) unit for converting the physical layer channel signal from the baseband modem unit into a signal of a high frequency band and amplifying and transmitting the signal of the high frequency band; The transmission section and the non-transmission section of the reverse physical layer channel signal are determined according to the interruption start point and the interruption rate based on the signaling message transmitted from the base station, and are provided to the baseband modem section and the RF section in the non-transmission section. And a control unit for controlling intermittent transmission of the reverse physical layer channel signal by cutting off power. The method of claim 1, The reverse physical layer channel signal includes a pilot channel signal and a MAC channel signal. The method of claim 2, The MAC channel includes a data rate control (DRC) channel and a reverse data rate indication (RRI) channel. The method of claim 2, And the pilot channel signal and the MAC channel signal are multiplexed and transmitted in time in the transmission section. The method of claim 2, And the pilot channel signal and the MAC channel signal are continuously transmitted on the same time axis in the transmission section. The method of claim 2, And a base station interpolates the pilot channel estimate of the non-transmission interval and uses the pilot channel estimate of the transmission interval. A baseband modem unit for generating a reverse physical layer channel signal; A radio unit for converting the physical layer channel signal from the baseband modem unit into a signal of a high frequency band; A power amplifier for amplifying and transmitting the high frequency signal; The transmission section and the non-transmission section of the reverse physical layer channel signal are determined according to the interruption start point and the interruption rate based on the signaling message transmitted from the base station, and provided to the baseband modem unit and the power amplifier in the non-transmission section. And a control unit for controlling intermittent transmission of the reverse physical layer channel signal by cutting off driving power. A receiver for receiving a signaling message including an interruption start point and an interruption rate information from a base station; Analyzing the signaling message to determine the start point and the interruption rate, determine the transmission section and the non-transmission section of the reverse physical layer channel according to the determined start point and the interruption rate, and the baseband modem unit and RF in the non-transmission section. And a controller for controlling intermittent transmission of the reverse physical layer channel by cutting off the driving power provided to the negative terminal. In the reverse physical layer channel intermittent transmission method of the terminal, Receiving a signaling message including an interruption start point and an interruption rate information from a base station; Analyzing the signaling message to determine an interruption start point and an interruption rate, and determining a transmission section and a non-transmission section of a reverse physical layer channel according to the determined interruption start point and the interruption rate; Transmitting the reverse physical layer channel in the transmission period, and intermittently transmitting the reverse physical layer channel by cutting off power provided to the baseband modem unit and the RF unit in the non-transmission period. . The method of claim 9, The reverse physical layer channel includes a pilot channel and a MAC channel. The method of claim 10, And wherein the MAC channel comprises a data rate control (DRC) channel and a reverse data rate indication (RRI) channel. The method of claim 10, And wherein the pilot channel and the MAC channel are multiplexed in time in the transmission section and transmitted. The method of claim 10, And the pilot channel and the MAC channel are continuously transmitted on the same time axis in the transmission section. The method of claim 10, And a base station interpolates and uses a pilot channel estimate of the non-transmission interval in the pilot period.

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