KR100266293B1 - Load Control Method Using Channel Load Detection in Wireless Packet Networks Using Spread Spectrum Signals - Google Patents

Abstract

PURPOSE: A method for controlling a load by sensing a channel load in a wireless packet network using a band diffusion signal is provided to set a time slot to be smaller than a packet, for the transmission by one packet over time slots, and to allowance a base station to decide whether to permit packet transmission using a channel load of a prior slot, for transmission to every terminal. CONSTITUTION: A terminal remains in an idle state(110), if a packet is not generated. If a packet is generated, and a transmission allowance signal or a packet transmission failure signal is received, the terminal is transferred to a transmission state(120). If a packet is generated and a transmission disallowance signal is received, the terminal is transferred to a backlogged state(130). If packet transmission is not completed, and a transmission allowance signal or a transmission disallowance signal is received, the terminal of the transmission state(120) remains in the transmission state(120). If the packet transmission is completed, a transmission allowance signal or a transmission disallowance signal is received from a base station, and a packet does not remain in the packet, the terminal is transferred to the idle state(110). If a packet transmission failure signal, packet transmission is completed but a packet transmission failure signal is received from the base station, or a transmission allowance signal or a transmission disallowance signal is received and a packet exists in the terminal, the terminal is transferred to the backlogged state(130). If re-transmission is not allowed, or a transmission disable signal is received from the base station, the terminal of the backlogged state(130) remains in the backlogged state(130). If re-transmission is allowed, and a packet transmission failure signal or a transmission allowance signal is received, the terminal is transferred to the transmission state(120).

Description

Load Control Method Using Channel Load Detection in Wireless Packet Networks Using Spread Spectrum Signals

The present invention relates to a load control method using channel load detection in a wireless packet network using a spread spectrum signal. The present invention relates to a number of packets being transmitted at a current time in a wireless network transmitting random packets using spread signals. Detects and decides whether to allow packet transmission in subsequent slots and whether to send packets continuously. Spread spectrum that enables stable wireless network operation by reducing the overload that occurs when the amount of traffic increases because the amount of traffic exceeds the capacity. It is an object of the present invention to provide a channel load detection protocol in a wireless packet network using a signal.

The mobile communication service, which is rapidly growing in demand, is mainly a type of service that enables voice information to be transmitted while the mobile communication service supporting the data service has not been activated yet, but the signal of the video during the movement is simple in data such as e-mail. The demand for reception is on the rise. In particular, research on IMT-2000 (International Mobile Telecommunication-2000) for 3G mobile telecommunications services, which supports not only voice signals but also simple data to video, can be serviced anywhere in the world through internationally integrated standards. Actively done in In addition, although there are some limitations in mobility, researches for high-speed data transmission are being conducted. Especially, the wireless LAN proposed in the IEEE 802.11 standard has already commercialized a product capable of data transmission of 2 Mbps (Mega bit per sec). It is becoming.

In general, for high speed data transmission as described above, the circuit-switch currently used in public switched networks, digital cellular and personal mobile communication systems is not preferable because of inefficient finite channels. Therefore, in order to solve the shortcomings of the circuit switched scheme, IMT-2000, which is currently being studied as a local area network or a standard of the next generation mobile communication system, applies a packet-switch for high speed data transmission. have.

In addition, the spread spectrum method, which is a signal method of code division multiple access (CDMA) applied in the digital cellular system that is currently being serviced, has an increased capacity and cannot be externally intercepted, and is rapidly changed due to a rapidly changing wireless channel. The advantages of being able to communicate reliably in the multipath environments that arise are demonstrated. For this reason, the wireless LAN that is already commercialized, cdmaOne of LMNQ (Lucent, Motolora, Nortel, Qualcomm, Samsung), which is proposed as a standard of IMT-2000, which is expected to be serviced in the future, or W-CDMA (Wideband-) led by Europe and Japan. CDMA also uses a spread spectrum method.

On the other hand, the multiple access method applied to a wireless packet network includes random access that attempts transmission in contention between packets, and scheduled access that controls transmission in advance to avoid collision before packet transmission. There are two types of plan access methods, a fixed allocation method for allocating resources exclusively and a request allocation method for allocating resources on demand. First, random access includes ALOHA, Carrier Sensing Multiple Access (CSMA), and spread ALOHA (spread ALOHA). In particular, spread spectrum ALOHA generates a packet to be transmitted to a mobile station, such as a narrow-band ALOHA. If you do not use a separate channel allocation process, the packet is transmitted using the assigned code. By using the spread spectrum signal system, the immunity in poor channels can be improved and the capacity can be increased. In a wireless network configuration using multiple cells that can be obtained by using the above, it is possible to secure the advantages such as soft handover and to simplify the protocol.

Therefore, hereinafter, a spread spectrum ALOHA network will be described as an spread spectrum wireless packet network.

As described above, the spread spectrum ALOHA network does not properly cope with the amount of traffic by using a simple protocol. Therefore, when there are many users, there is a disadvantage that stable operation of the network is impossible due to overload.

A method for suppressing an overload phenomenon using a simple protocol using the characteristics of the spread spectrum ALOHA is a channel load detection protocol. That is, the base station detects the number of packets being transmitted on the channel (channel load) and transmits them to all the terminals, and the terminal to transmit the packet transmits the packets according to the signal transmitted from the base station according to the channel load before transmitting the packets. Decide if you want to transfer.

Hereinafter, a channel load sensing protocol in a spread spectrum wireless packet network according to the prior art will be described.

Hereinafter, the configuration and operation of a channel load detection protocol in a spread spectrum wireless packet network according to the prior art will be described with reference to FIGS. 1 to 3.

In the spread spectrum wireless packet network according to the prior art, the load control method using the channel load detection is a packet generation step of preparing to transmit to the next time slot when the packet is generated at any time in the terminal, and the packet is generated in the packet generation step When the generated terminal receives the information on the channel load transmitted from the base station at the guard time (guard time) to determine whether to transmit the packet, and if the packet transmission is allowed in the transmission permission confirmation step, the packet to be transmitted The packet transmission step of transmitting at the same time as the start of packet time, the packet reception step of receiving the packet transmitted in the packet transmission step, detecting the number of packets being transmitted at the same time, and the packet detected at the packet reception step By comparing the number of times and the preset threshold, whether the packet is allowed or not A transmission decision step of determining whether to allow transmission and transmitting it to all mobile stations.

Hereinafter, the operation of the load control method using channel load detection in the conventional spread spectrum wireless packet network configured as described above will be described.

First, FIG. 2 shows a state of a terminal, where each terminal has an idle state 10 without a packet to transmit, a transmission state 20 that is transmitting a packet, and a packet with a packet to transmit. Is not allowed and is waiting for the next time slot or is not allowed to be retransmitted backlogged state (30). And, the state change of the terminal is made at the start of the packet time, as shown in FIG.

According to the conventional load control method using channel load detection in a spread spectrum wireless packet network, first, a packet to be transmitted from each terminal is generated at an arbitrary time in a packet generation step, and is ready for transmission until the next packet time because it is a slotted network. Will wait. If the terminal is already transmitting the packet is stored in the terminal until the transmission of the packet in the transmission is completed. Subsequently, in the transmission permission confirmation step, the terminal having the packet to transmit receives whether to allow transmission from the base station at the boundary time and determines whether to transmit the packet. In this case, the transmitted signal transmitted from the base station can be stably received because it is one of the transmission permission and the transmission impossibility. When the terminal receives the transmission permission signal, the packet is transmitted at the beginning of the subsequent packet time, and when the terminal receives the non-transmission signal, the terminal waits for a signal transmitted from the base station at the next boundary time.

If transmission is allowed through the above process, the terminal transmits the packet to the base station in the packet transmission step. At this time, the packet to be transmitted is spread to the terminal through a pseudo noise code that is allocated to the other terminal, and is transmitted with power controlled to be received at the same power at the base station. In the packet receiving step, the packet transmitted in the packet transmitting step is received, and the number of packets being transmitted is sensed. At this time, a method of detecting the number of packets includes a method for the interference signal level, a method using the number of channel cards receiving the packet, and a method using an average error probability.

Subsequently, in the transmission allowance step, the number of packets detected in the packet reception step is compared with a preset threshold value to transmit a signal to all terminals whether the transmission is allowed at the boundary time. At this time, if the number of packets detected in the packet reception step is less than the threshold value Th1 for the channel load detection protocol, the transmission permission is transmitted to all terminals, and if the packet number is greater than or equal to the threshold value Th1, transmission is impossible. In addition, the terminal that has completed the packet transmission checks whether an error has occurred in the transmitted packet, and individually transmits a packet success or retransmission command signal to the terminal.

The state change of the terminal made through the above process is summarized as follows.

As shown in FIG. 2, if the terminal in the inactive state 10 does not generate a packet And continue to remain in the inactive state (10), and if the packet is generated and allowed to transmit the packet is moved to the transfer state (20), while if the packet is generated but not allowed to transmit the packet to transition to the backlog state (30) do.

Subsequently, the terminal in the transmission state 20 remains in the transmission state when the packet transmission is not completed, while the terminal is inactive when the packet transmission is completed and receives a packet success signal from the base station and no packet remains in the terminal. Moving to state 10, when the packet transmission is completed, but receives a packet transmission failure signal from the base station, or if the packet to be transmitted remains in the terminal even if the packet success signal is received, the transition to the backlog state 30.

And, if the terminal of the backlog state 30 is not allowed to be retransmitted Or, if receiving a non-transmission signal from the base station stays in the backlog state 30, while the retransmission is allowed and the packet transmission from the base station is allowed to transition to the transmission state (20).

3 illustrates an example of a packet transmission state through the above processes. In Figure 3, the capacity is 5, the threshold is 3, the number of packets received at the base station in a spread spectrum ALOHA network in which the length of the packet is four times the length of the slot and the signal transmitted from the base station to the terminal in each slot 'D' means no transmission and 'E' means transmission permission signal. That is, in the channel load detection protocol, if the number of packets transmitted to the previous slot is detected and less than the first threshold Th1, no error occurs in the packet because the packet is transmitted within the next slot even if the packet is transmitted to the next slot. In the case where the first threshold value Th1 is equal to or greater than 1, the packet is transmitted to the next slot, so that the number of packets simultaneously transmitted exceeds the capacity, thereby stably receiving the previously transmitted packet.

However, in the conventional spread spectrum wireless packet network, the channel load detection protocol does not start a new transmission when the number of packets simultaneously transmitted in the previous slot exceeds the capacity, but a portion of the packet in the previous slot does not start. By continuously sending an errored packet through the next slot until the packet transmission is completed, it not only prevents the transmission of other packets but also delays the time when a new packet transmission should be attempted. There is a problem in that an overload phenomenon occurs in a network due to a rapid increase in processign time.

Accordingly, an object of the present invention is to solve such a problem, in a slotted spread spectrum wireless packet network to set a time slot smaller than the packet length to allow one packet to be transmitted over a plurality of time slots, the base station By using the detected channel load of the previous slot to determine whether to allow packet transmission and whether to suppress the packet transmission to all terminals, by increasing the traffic load that reduces network efficiency, it can be operated stably in more traffic. In addition, the present invention provides a load control method using channel load detection in a wireless packet network using a spread spectrum signal, which minimizes time delay caused by unnecessary packet transmission, thereby ensuring excellent characteristics in performance of processing time. .

1 is a flowchart of a time slot between a base station and a terminal in a spread spectrum wireless packet network;

2 is a terminal state transition diagram of a channel load detection protocol according to the prior art in a spread spectrum wireless packet network;

3 is an example of packet transmission and channel state signals considering a channel load detection method according to the prior art in a spread spectrum wireless packet network,

4 is a state transition diagram of terminals in a load control method using channel load detection in a wireless packet network using a spread spectrum signal according to the present invention;

5 is an example of packet transmission and channel state signals considering a load control method using channel load detection in a wireless packet network using a spread spectrum signal according to the present invention;

6 is a comparison diagram of network efficiency performance of a load control method using channel load detection according to the prior art and the present invention in a spread spectrum wireless packet network;

7 is a comparison of average processing time performance of a load control method using channel load detection according to the prior art and the present invention in a spread spectrum wireless packet network.

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

110: inactive state 111: inactive-inactive transition

112: inactive-transfer transition 113: inactive-backlog transition

120: transfer status 121: transfer-transfer transition

122: transfer-inactive transition 123: transfer-backlog transition

130: backlog state 131: backlog-backlog transition

132: backlog-transfer transition

In the wireless packet network using a spread spectrum signal according to the present invention for achieving the above object, the load control method using the channel load detection in the base station detects the number of packets being transmitted in the current time slot, the packet of the subsequent slot Unlike the conventional method of transmitting only whether to allow transmission to all terminals, the network efficiency is reduced by detecting the number of packets and determining whether to allow the transmission of packets in subsequent slots, and determining whether to continuously transmit packets to all terminals. By increasing the load, it is possible to operate stably in more traffic, and it is characterized by minimizing time delay caused by unnecessary packet transmission.

Hereinafter, a channel load detection protocol and its operation in a spread spectrum wireless packet network according to the present invention will be described with reference to FIGS. 4 to 5.

In the spread spectrum wireless packet network according to the present invention, in the load control method using channel load detection, when a packet is generated at a certain time in a terminal, a packet generation step of preparing to transmit to a next time slot and a packet generation step in a packet generation step are performed. In the state transition step of determining the state of the current time slot by determining whether the packet transmission and continuous packet transmission according to the channel status signal transmitted from the base station at the guard time (guard time), and in the transmission permission confirmation step If packet transmission is allowed, a packet transmission step of transmitting a packet to be transmitted at the same time as the start of the packet time, a packet reception step of receiving a packet transmitted at the packet transmission step and sensing the number of packets being transmitted at the same time, and a packet Allow packets by comparing the number of packets detected at the reception stage with a preset threshold And a transmission decision step of determining whether to continuously transmit the packet through comparison with the capacity and transmitting it to all mobile stations.

Hereinafter, an operation of a load control method using channel load detection in a spread spectrum wireless packet network according to the present invention configured as described above will be described.

First, FIG. 4 shows a state of a terminal by a load control method using channel load detection in a spread spectrum wireless packet network according to the present invention. Each terminal has an inactive state 110 without a packet to transmit and a packet is being transmitted. And a backlog state 130 where there is a packet to transmit but not allowed to send the packet, waiting until the next time slot or not being allowed to retransmit. And, the state change of the terminal is made at the start of the packet time, as shown in FIG.

According to the channel load detection protocol in the spread spectrum wireless packet network according to the present invention, first, packets to be transmitted from each terminal are generated at random times in the packet generation step, and are ready to transmit until the next packet time because the slotted network. do. If the terminal is already transmitting the packet is stored in the terminal until the transmission of the packet in the transmission is completed.

Subsequently, in the state transition step, the terminal having the packet to receive receives whether or not to transmit the packet according to the channel state signal transmitted from the base station at the boundary time to determine whether to transmit the packet to the terminal that does not transmit the packet. The terminal transmitting the packet decides whether to continuously transmit the packet. At this time, since the channel state signal transmitted from the base station is one of three types of transmission allowance, transmission impossibility, and packet transmission failure, there is no additional burden because there is less added function than in the related art. When the terminal receives the transmission permission signal, the packet is transmitted at the beginning of the subsequent packet time, and when the terminal receives the non-transmission signal, the terminal waits for a signal transmitted from the base station at the next boundary time.

On the other hand, when the terminal receives a packet transmission failure, the terminal which did not transmit the packet attempts to transmit the packet in the next slot, and the terminal that transmits the packet attempts to retransmit the packet being transmitted from the beginning. The reason for this is that when the UE receives a packet transmission failure, the same conditions as in the case where the number of packets detected in the previous slot is '0' because no packets continuously transmitted to the current slot are transmitted to the current slot. This is the same as when a transmission permission signal is received to a terminal that has not transmitted a packet. In the case of a terminal transmitting a packet, a packet previously transmitted in the same channel condition as when the number of packets detected in a previous slot is '0' is the same. This is because a new transmission is attempted from the beginning of the packet regardless of the amount of transmission.

If transmission is allowed through the above process, the terminal transmits the packet to the base station in the packet transmission step. At this time, the packet to be transmitted is spread to the terminal through a pseudo noise code that is allocated to the other terminal, and is transmitted with power controlled to be received at the same power at the base station. In the packet receiving step, the packet transmitted in the packet transmitting step is received, and the number of packets being transmitted is sensed. At this time, a method of detecting the number of packets includes a method for the interference signal level, a method using the number of channel cards receiving the packet, and a method using an average error probability.

Subsequently, in the transmission allowance step, the number of packets detected in the packet reception step is compared with a preset threshold value to determine whether to allow transmission, and whether to continuously transmit the packet is determined by comparing with the capacity. This signal is transmitted to all terminals. At this time, if the number of packets detected in the packet receiving step is less than the threshold value (Th) for the channel load detection protocol, the transmission permission is transmitted to all the terminals, and if the threshold value (Th) or more and less than the capacity, the transmission impossible signal If the capacity exceeds the capacity, a packet transmission failure signal is transmitted. Therefore, it is not necessary to individually transmit a packet success or retransmission command signal to the corresponding terminal by checking whether an error has occurred in the packet to the terminal which has completed the packet transmission.

5 illustrates an example of a packet transmission state through the above processes. In FIG. 5, the capacity is 5, the threshold is 3, and the number of packets received at the base station in a spread spectrum ALOHA network in which the length of the packet is four times the length of the slot, and the signals transmitted from the base station to the terminal in each slot. 'D' indicates no transmission, 'E' indicates a transmission allowed signal, and 'NAK' indicates a packet transmission failure. In this case, a signal of a packet transmission success is not transmitted separately, because a transmission impossible signal and a transmission permission signal mean packet success.

3 and 5, the packet transmission of the channel load detection protocol and the signal transmitted from the base station in the spread spectrum wireless packet network according to the prior art and the present invention can be compared. First, the prior art and the technique according to the present invention perform the same operation-up to the sixth slot-until the channel load exceeds the capacity. However, when the channel load exceeds the capacity, the conventional technique transmits a non-transmission signal from the base station to all terminals. In the technique according to the present invention, a packet transmission failure signal is transmitted to all terminals to transmit 1 packet. The transmission stops and transmits a new / 4. Therefore, while the conventional technique uses channels (sixth to ninth slots) unnecessarily, the technique according to the present invention can eliminate unnecessary use of conventional channels.

The state change of the terminal through the above process can be summarized as follows, as shown in FIG.

As shown in FIG. 4, if the terminal in the inactive state 110 does not generate a packet When the packet is generated and receives a transmission allowance signal (E) or a packet transmission failure (NAK) signal, the packet is moved to the transmission state 120 when the packet is generated and receives a transmission but no transmission signal. If so, the transition to the backlog state 130.

Subsequently, the terminal in the transmission state 120 does not complete the packet transmission and, when receiving the transmission permission signal or the transmission impossible signal, stays in the transmission state 120, while the packet transmission is completed and the transmission permission signal from the base station is received. When receiving a transmission impossible signal and there is no packet to be transmitted to the terminal, the mobile station moves to the inactive state 110 and receives a packet transmission failure signal from the base station or completes the packet transmission and completes the packet transmission, but transmits the packet from the base station. When receiving a failure signal, or receiving a transmission permission signal or a transmission impossible signal and a packet to be transmitted remains in the terminal, it transitions to the backlog state 130.

And, if the terminal of the backlog state 130 is not allowed to be retransmitted Or, if receiving a non-transmission signal from the base station stays in the backlog state 130, while being allowed to retransmit When the packet transmission failure signal or the transmission permission signal is received, the state transitions to the transmission state 120.

6 and 7 illustrate the performance of the network efficiency and the average processing time of the channel load detection protocol in the spread spectrum wireless packet network according to the prior art and the present invention. In other words, performance is compared with respect to the packet load-to-slot length ratio and the traffic load in a spread spectrum ALOHA network having a capacity of 10 and a threshold value Th.

First, in terms of performance of network efficiency, as shown in FIG. 6, in the spread spectrum wireless packet network according to the present invention, the channel load detection protocol shows similar performance to the conventional traffic load to secure the best network efficiency, but more than this. In traffic load, it can be seen that better performance can be obtained than in the prior art. In addition, according to Figure 7, the average processing time of the channel load detection protocol in the spread spectrum wireless packet network according to the present invention also shows superior performance compared to the prior art. In particular, in the prior art, while the same average processing time is caused at the same network efficiency, the average processing time of the channel load detection protocol in the spread spectrum wireless packet network according to the present invention is more at the traffic load causing the same network efficiency as the prior art. Excellent average processing time performance can be obtained. This is because the transmission of the packet is stopped even during transmission, so that the rate at which the packet fails to occupy the channel is reduced, and the point of attempting retransmission is earlier than before.

That is, in the channel spread detection protocol according to the present invention, if an error occurs in a portion of a packet transmitted over a plurality of slots in the channel load detection protocol, an error has already occurred even if the remaining portion that has not been transmitted continues to be transmitted. Because of this, retransmission is necessary. Therefore, even if a packet is in transit, the packet that caused the error stops transmission, restrains unnecessary channel use, and minimizes the time required to complete a successful packet transmission through retransmission. Enable stable network operation.

According to the channel load detection protocol in the slotted wireless packet network using the spread spectrum signal according to the present invention described above, the length of the time slot is set smaller than the packet length to determine the number of packets being transmitted in the previous slot. Determining whether to allow packet transmission in the next time slot, and if the number of packets being transmitted exceeds the capacity, stops the transmission even if the packet is not completed, thus ensuring stable network efficiency even if the traffic volume increases. By improving the time delay characteristics by reducing unnecessary use of the channel, it will be applicable to traffic requiring higher data rates such as multimedia in wireless packet networks, and will also accommodate more users.

Claims (8)

In a wireless packet network using a spread spectrum signal, the access method through the channel load, A packet generation step of generating a packet at an arbitrary time in the terminal and preparing to transmit it to the next time slot; A state transition step of determining, by the terminal generating the packet in the packet generation step, whether the packet is transmitted and whether the packet is continuously transmitted according to the channel state signal transmitted from the base station at the boundary time, and determining the current time slot state; A packet transmission step of transmitting a packet to be transmitted at the same time as the packet time starts if packet transmission is permitted in the transmission permission confirmation step; A packet reception step of receiving a packet transmitted in the packet transmission step at a base station and detecting the number of packets being transmitted at the same time; And A transmission decision step of determining whether to allow a packet by comparing the number of packets detected in the packet reception step with a preset threshold value, and determining whether to continuously transmit the packet by comparing the capacity with each other and transmitting it to all mobile stations. Load control method using channel load detection in a spread spectrum wireless packet network, characterized in that consisting of. The method of claim 1, wherein the transmission determination step When the number of packets detected in the packet receiving step is smaller than a preset threshold, the base station transmits a transmission permission signal to all terminals; When the number of packets detected in the packet receiving step is greater than or equal to a preset threshold and less than the capacity, the base station transmits a non-transmission signal to all terminals; When the number of packets detected in the packet receiving step exceeds the capacity, the base station transmits a packet transmission failure signal to all terminals, the load control method using channel load detection in a wireless packet network using a spread spectrum signal . The method of claim 2, wherein when the packet transmission failure signal is received in the transmission determination step, After transmitting the packet, the mobile station stops transmitting the packet and attempts to retransmit the packet. A mobile station that has not transmitted a packet performs the same operation as when receiving a transmission permission signal from a base station, wherein the load control method using channel load sensing in a wireless packet network using a spread spectrum signal. 3. The method of claim 2, wherein the threshold is set to a value less than or equal to a capacity of a network. The method of claim 1, wherein in the state transition step, the states of all terminals are Inactive with no packets to transmit; Transmission status while transmitting a packet; And A method of load control using channel load detection in a wireless packet network using spread spectrum signals having a packet to be transmitted but not being allowed to transmit the packet, and waiting for the next time slot or not to be retransmitted. The method of claim 5, wherein in the inactive state If a packet is not generated in the terminal, it is in the inactive state; When a packet is generated in the terminal and receives a transmission permission signal or a packet transmission failure signal, the terminal moves to the transmission state; When a packet is generated in the terminal but receives a transmission impossibility signal, the terminal transitions to the backlog state. The load control method using channel load detection in a wireless packet network using a spread spectrum signal. The method of claim 5, wherein in the transmission state When the terminal does not complete the packet transmission and receives the transmission permission signal or the transmission transmission signal, and after the terminal successfully completes the packet transmission, the terminal transmits the packet remaining in the buffer or the newly generated packet through the transmission permission signal. When attempting to transmit a packet, and when the terminal completes the packet transmission but fails to successfully transmit the packet, the terminal is allowed to retransmit the packet through the transmission permission signal and transmits the packet. The terminal completes packet transmission, receives a transmission permission signal or a transmission impossible signal from the base station, and moves to the inactive state when no packet to transmit remains in the terminal; When the terminal receives a packet transmission failure signal from the base station during the packet transmission or when the packet transmission is completed or completes the packet transmission and receives the packet transmission success signal, but the packet to be transmitted remains in the terminal, the terminal transitions to the backlog state. A load control method using channel load detection in a wireless packet network using a spread spectrum signal. The method of claim 5, wherein in the backlog state If the terminal is not allowed to retransmission or receives a non-transmission signal from the base station will remain in the backlog state, When the terminal is allowed to retransmit and receives a packet transmission failure signal or a transmission permission signal from the base station, the terminal transitions to the transmission state. The load control method using channel load detection in a wireless packet network using a spread spectrum signal .