KR100713443B1 - Transmission controlling method of reverse rink in mobile communication system - Google Patents

Abstract

According to the present invention, the mobile station receives each forward information indicating the increase or decrease of the data rate of the mobile station of each reverse channel from the base station to the mobile station through the forward control channel. A method of controlling the data rate of a reverse channel, wherein when the forward information indicates an increase in the data rate, is the rate increaseable information transmitted by the mobile terminal through the reverse control channel before receiving the information indicate an increase in the data rate? And transmitting the data in a reverse direction by setting a data rate higher than the current data rate in a range within a maximum data rate when the rate increase information indicates an increase in the data rate. Reversed In the data transmission process, the set data rate information is transmitted through a reverse control channel, and the rate of increase rate information can be set by checking whether the set reverse data rate can be increased and then transmitted through the reverse control channel. Include.

Mobile communication system, reverse link, RRI, RAB, IAB

Description

Transmission control method of reverse link in mobile communication system {TRANSMISSION CONTROLLING METHOD OF REVERSE RINK IN MOBILE COMMUNICATION SYSTEM}             

1 is a control flowchart of a reverse rate used in a mobile station of a mobile communication system according to a conventional method;

2 is a diagram for describing an operation of transmitting and receiving between a sector included in an active set and a mobile station;

3 is a control flowchart of a mobile station for rate control of a reverse link in a mobile communication system according to an embodiment of the present invention;

4 is a control flowchart of a base station for data rate control of a reverse link in a mobile communication system according to an embodiment of the present invention.

The present invention relates to a method for controlling transmission in a mobile communication system, and more particularly to a method for controlling transmission of a reverse link.                         

In general, the technology of the mobile communication system has made rapid progress, and various types of systems are currently proposed, and the commercialization of these systems is being accelerated. Such systems generally use a code division multiple access (CDMA) scheme, and a 1xEVDO system called high data rate (HDR) that transmits only data has been proposed. The 1xEVDO system is a mobile communication system using CDMA technology for the purpose of transmitting only high-speed data.

Like all other systems, proper scheduling is required in this 1xEVDO system to efficiently transmit packet data in the forward and reverse directions. First, among the terms described below, "forward" means a link from a base station to a terminal, and "reverse" means a link from a terminal to a base station. In the case of forward link data transmission, the base station transmits data only to one specific mobile station having the best channel state in consideration of the air condition and other environment between the base station and the 1xEVDO mobile station. Therefore, it has the characteristic of maximizing the data transmission efficiency (Throughput) to the mobile station. However, in the case of reverse link transmission, a plurality of mobile stations simultaneously access the base station to transmit packet data. For this reason, the base station must appropriately control the flow and congestion of data received from a plurality of mobile stations to perform appropriate overload control within the capacity of the mobile station.

In addition, the mobile communication system proposed to provide multimedia services as well as the 1xEVDO system needs to efficiently manage such reverse link data. In order to efficiently control the transmission of the reverse link, the performance and capacity of the system must be guaranteed.

The present method of managing the transmission of reverse packet data will now be described. In the current 1xEVDO system, data transmission of the reverse link is performed by a reverse activity bit (RAB) and a reverse rate message transmitted from a base station. In addition, the mobile station informs the base station of the rate of the mobile station that changes every time through the reverse rate indicator (RRI). The Forward Link Medium Access Control (MAC) channel of the 1xEVDO system is time-division multiplexed by a pilot channel, a forward activity bit (FAB) channel, and a reverse activity bit (RAB) channel and transmitted from a base station to a mobile station. The dual RAB is a portion representing the congestion degree of the reverse link, and the data rate that the mobile station can transmit varies according to the RAB value. That is, when the base station adjusts the overload control and the capacity of the reverse link, the RAB is used to increase or decrease the data rate from the mobile station to control the data flow from the mobile station. However, since the RAB is broadcast information, all mobile stations receiving the RAB uniformly double or double the data rate according to the value of the RAB. In this case, the RAB transmitted to the mobile station is determined by the following Equation (1).

T mod RABlength

In Equation 1, T is a system time, and RABlength is a parameter transmitted from a base station to a mobile station and is determined by the number of slots. If this is shown in a table it can be shown as shown in Table 1 below. That is, the base station transmits any one slot value shown in Table 1 below to the mobile station. The mobile station then determines the slot time for receiving the RAB in consideration of the received RABlength and the system time. The mobile station receives the RAB of the forward MAC channel through the determined slot time.

Binary Length (slots) 00 8 01 16 10 32 11 64

That is, the base station transmits the RAB in accordance with the time of Equation 1, and the mobile station determines the data rate for receiving the RAB according to the calculation result of Equation 1 and transmitting it to the current reverse link. As a result, the mobile station determines the increase and decrease of the data rate of the reverse link according to the RAB reception time determined in Equation (1).

At this time, the mobile station must increase or decrease the data rate according to the value of the RAB received from the base station. However, the mobile station may be limited in the maximum data rate that can be transmitted due to the ReverseRateLimit message received from the base station or the limitation of the transmission power. In this case, despite the increase command of the RAB, the mobile station does not increase the transmission rate, which wastes radio resources. On the contrary, even if the mobile station requires a higher data rate for transmitting more data, the data rate increases or decreases by one step according to the RAB. Therefore, the base station must know the state of the mobile station in advance in order to use the radio resources efficiently, and a method for transmitting the state of the mobile station from the mobile station to the base station must be provided. However, the present 1xEVDO system or the currently proposed mobile communication system does not provide this.

1 is a control flowchart of a reverse rate used in a mobile station of a 1xEVDO system.
First, the mobile station determines the data rate at the lowest data rate when initially transmitting data on the reverse link. Then, if the current transmission rate is lower than the transmission rate indicated by the RRL (ReverseRatelimit) message received from the base station, the mobile station waits 32 slots (53.33 [ms]) and transmits reverse data at the transmission rate indicated by the RRL message. Then, the reverse rate is determined as shown in FIG. In addition, if the current rate is greater than that indicated by the RRL message, the mobile station immediately switches to the low data received from the base station to perform reverse data transmission. The RRL message is a message transmitted to the base station when the initial rate is determined and the rate is re-determined.

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In addition, when the data rate is determined, the mobile station informs the base station of the data rate of the reverse link currently being transmitted through a reverse rate indicator (RRI) symbol as shown in Table 2 below. In this case, the reverse link data rate is set to one of 4.8 / 9.6 / 19.2 / 38.4 / 76.8 / 153.6 [Kbps]. The rate of this reverse link may be reconfigured through an appropriate message, such as an RRL message or an RAB message sent from a base station to a mobile station.

Data Rate [Kbps] RRI Symbol 4.8 001 9.6 010 19.2 011 38.4 100 76.8 101 153.6 110

Table 2 shows a schematic diagram of the Reverse Rate Indicator (RRI) symbol used in the 1xEVDO system. As described above, when resetting the data rate of the reverse link of the mobile station, the base station should transmit a ReverseRateLimit message to the mobile station. If the ReverseRateLimit message is shown in a table, it may be shown as in Table 3 below. When the mobile station receives the ReverseRateLimit message, it sets the data rate of the reverse link by comparing the data rate set to the mobile station with the current data rate.

Field Length (bits) Message ID 8 29 occurrence of the following two field RateLimitIncluded One RateLimit 0 or 4 Reserved Variable

Table 3 shows a schematic diagram of a ReverseRateLimit message.

The ReverseRateLimit message is a message transmitted from the base station to the mobile station and used to control the data rate of the reverse link. 29 records may be inserted in the message, each record representing a data rate assigned to the corresponding MACindex. MACindex is added from 3 to 31.

In Table 3, the "MessageID" field represents the ID of the RRL message, and the "RateLimitIncluded" field indicates whether the "RateLimit" field is added. That is, if the field is added, the "RateLimitIncluded" field is set to "1", otherwise it is set to "0". The "RateLimit" field is a portion indicating the data rate assigned by the base station to the mobile station and is added only when the "RateLimitIncluded" field is set to "1". The base station can allocate the following data rates of the reverse link to the mobile station using 4 bits as shown in Table 4.

0x0 4.8 kbps 0x1 9.6 kbps 0x2 19.2 kbps 0x3 38.4 kbps 0x4 76.8 kbps 0x5 153.6 kbps All other values are invalid.

While receiving the above message and the mobile station is transmitting reverse data, the mobile station continues to monitor the Forward MAC channel transmitted from the base station as shown in FIG. In particular, the RAB (Reverse Activity Bit) transmitted through the forward MAC channel is monitored and the persistence test is performed to control the reverse data rate being transmitted.

This will be described in detail with reference to FIG. 1. In step 100, the mobile station monitors a reverse activity bit (RAB) indicating congestion of the reverse link of the MAC channel. If the RAB is detected in step 100, the mobile station proceeds to step 102 to check whether the detected RAB has a value of "1". That is, if the mobile station has six active sets, the mobile station checks whether any one of all forward MAC channels received from the six active sets has an RAB value of 1. If RAB has a value of 1, the process proceeds to step 112; otherwise, the process proceeds to step 104.

First, the case where all RABs in all active sets are 0 will be described.

The mobile station proceeds to step 104 and performs a persistence test. This persistence test is used when the RAB is broadcast from the base station. That is, when the base station controls a plurality of mobile stations simultaneously through one RAB message, it is used to control the amount of data transmitted on the reverse link. The persistence test is a method of determining the increase or decrease according to whether a desired condition is generated by generating a random number.

Accordingly, if the persistence test succeeds in step 104, the mobile station proceeds to step 106 to increase the reverse TX rate.

On the other hand, if the persistence test fails, proceed to step 120. The mobile station increases the reverse rate in step 106 and then proceeds to step 108 to compare the increased TX rate and the maximum TX rate. If the increased transmission rate is greater than the maximum transmission rate, the mobile station proceeds to step 110 and sets the TX rate to the maximum transmission rate, and then proceeds to step 120.

Next, the case in which any RAB in the Active Set is 1 will be described. That is, the process proceeds from step 102 to step 112. If the mobile station proceeds to step 112, it performs a persistence test. The persistence test performed here also refers to a procedure for generating a random number and checking it as described above. In addition, the persistence test is performed when all terminals connected to the base station are commonly controlled. If the mobile station succeeds as a result of performing the 112 persistence test, the mobile station proceeds to step 114; otherwise, the mobile station proceeds to step 120. Proceeding to step 114, the mobile station reduces the transmission rate. After the transmission is reduced as described above, the flow proceeds to step 116, where the reduced transmission rate is compared with the minimum transmission rate. As a result of the comparison, if the reduced transmission rate is smaller than the minimum transmission rate, the process proceeds to step 118; otherwise, the process proceeds to step 120. In step 118, the mobile station sets the transmission rate to the minimum transmission rate and then proceeds to step 120. In this case, the lowest transmission rate may be 9.6 [kbps] set as a default, and the lowest transmission rate may be specified by a message at connection connection. After determining the transmission rate in this manner, the mobile station proceeds to step 120 to generate an RRI symbol according to the determined transmission rate. Thereafter, in step 122, the traffic and the RRI symbol are transmitted only when the traffic connection is opened. If no traffic connection is open, only RRI symbols are sent.

2 is a diagram for describing a transmission / reception operation between an HDR sector and a mobile station included in an active set. As shown in FIG. 2, a forward traffic channel, a reverse traffic channel, a forward MAC channel, and a reverse MAC channel are allocated between sector 1, which has an open connection, and a mobile station. There is no forward traffic channel assigned between mobile stations. When using the 1xEVDO system, the mobile station can maintain a maximum of six active sets. Therefore, the mobile station monitors the forward MAC channel, which is the control channel of all sectors included in the active set, and in particular, monitors the RAB to determine the reverse data rate.

The mobile station monitors the RAB of the forward MAC channel of the base station included in the current active set, and receives the information in which at least one RAB of the sector included in the active set is set to "1". Perform persistence test for The mobile station generates a random number when performing the persistence test. This value is then compared with the value defined in the persistence vector received from the base station during or during the connection. As a result of the comparison, if the randomly generated number satisfies the desired condition, it is determined that the persistence test is successful. That is, even if at least one received RAB is set to "1", if the persistence test is successful, the current reverse data rate is reduced to 1/2. However, if the persistence test fails, the data rate is maintained. At this time, if the reverse data rate becomes smaller than the lowest rate, the reverse data rate is maintained at the lowest rate. In addition, if all of the RABs received from the sectors included in the active set are set to "0", and success is performed by performing the persistence test as described above, the current reverse data rate is doubled. However, if the persistence test fails, the data rate is maintained. In this case, if the reverse data rate becomes larger than the maximum rate, the data rate is maintained at the maximum rate. In addition, if the terminal is limited to the transmission power, the data transmission is performed while maintaining the current data rate. The RAB, which doubles or reduces the data rate by half, is time-multiplexed with the FAB and transmitted to the mobile station through the forward MAC channel, which is a common channel. Therefore, the RAB is transmitted to all mobile stations, and all mobile stations uniformly increase or decrease the data rate according to the RAB command.

This data rate control method of the reverse link of the current 1xEVDO system can be a simple bandwidth control and overload control in terms of the system. However, the above-described method is a batch control method that does not consider the state of the terminal, resulting in a waste of bandwidth and reducing the data transmission efficiency of the terminal. Therefore, in order to prevent waste of bandwidth and provide transmission efficiency, the base station should control the subsequent transmission rate in consideration of the state of the terminal. That is, the base station knows the state of the mobile station, and thus the rate can be controlled in consideration of the state of the terminal. This is the same case not only in the 1xEVDO system but also in the currently proposed mobile communication system.

However, as described above, current systems do not control the transmission rate in consideration of the state of the mobile station and the state of the terminal. In other words, current systems cannot accommodate this. Therefore, when the current system is used, it is difficult to improve transmission efficiency and it is difficult to efficiently use bandwidth.

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It is therefore an object of the present invention to provide a method for transmitting status information of a mobile station from a mobile station to a base station.

Another object of the present invention is to provide a method for efficiently using a reverse link by grasping state information of mobile stations received from a mobile station.

Another object of the present invention is to provide a method for providing status information of a mobile station to a base station using less overhead in the mobile station.
The present invention for achieving the above objects is a mobile terminal after the mobile terminal receives each forward information indicating the increase or decrease of the data rate of the mobile terminal of each reverse channel from the base station to the mobile terminal through the forward control channel A method of controlling the data rate of each reverse channel of data to be transmitted, wherein when the forward information indicates an increase in the data rate, the rate increase information transmitted by the mobile terminal through the reverse control channel before receiving the information is increased. Checking whether the data rate is increased, and when the rate increase information indicates the increase in the data rate, the mobile station sets a data rate higher than the current data rate in a range within a maximum data rate to reverse data. Transfer Comprises a process,
When the data is transmitted in the reverse direction, the set data rate information is transmitted through a reverse control channel, and the rate of increase rate information is set by checking whether the set reverse data rate can be increased and then transmitted through the reverse control channel. More courses,
Checking whether the reverse data rate can be increased;
If the current transmission rate of the mobile station is equal to the maximum allowable transmission rate or is equal to or less than a threshold set by the amount of data stored in the current buffer or is controlled by two or more sectors, the increase of the transmission rate is impossible and the transmission of the mobile station is performed. If the power cannot accommodate the increase in the transmission rate, the increase in the transmission rate is made impossible.
When the transmission rate increase information indicates the increase in the data rate, the mobile station performs a PV test, and when the PV test is successfully performed, the mobile station transmits data higher than the current data rate in a range within a maximum data rate. The mobile station performs the reverse data transmission by maintaining a current data rate when a data rate is set and a data rate is increased.
When the forward information indicates a decrease in the data rate, the mobile station transmits data in a reverse direction by setting a data rate lower than the current data rate in a range within a minimum data rate; When the decrease is indicated, the data is transmitted by setting a data rate lower than the current data rate within the minimum data rate range only when the PV test is performed and succeeded.
The method may further include transmitting the set data rate information through a reverse control channel when transmitting data in the reverse direction.
The present invention for achieving the above object is a method for controlling the reverse data rate of the mobile terminal after receiving the possible increase information of the reverse data rate from the mobile terminal,
Determining a transmission rate limit value of the mobile station through authentication and characterization of the mobile station; generating and transmitting a reverse link rate value after determining the rate limit value; and increasing the reverse link received from the mobile station. Determining a reverse active bit of the mobile station by checking a possible information value and a backward capacity and transmitting the same to a mobile station;

When one mobile station transmits data through two or more reverse links, the reverse active bit is determined by checking all possible incremental information of each reverse link, and when one mobile station transmits data through two or more reverse links, A reverse active bit is generated and transmitted for each reverse link.

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Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings.

In addition, in the following description, there are many specific details such as specific messages or signals, which are provided to aid the overall understanding of the present invention, and it is understood that the present invention may be practiced without these specific details. It will be self-evident to those of ordinary knowledge. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a control flowchart of a mobile station for rate control of a reverse link in a mobile communication system according to an embodiment of the present invention. Hereinafter, an operation for controlling the rate of reverse link according to the present invention will be described in detail with reference to FIG.

Before describing with reference to FIG. 3, the structure of the RRI symbol should be changed according to the present invention. As such, in the case of the RRI symbol for providing the state of the terminal to the base station, an increase in overhead for informing the state information of the mobile station should be minimized. This satisfies the above, and the RRI structure proposed by the present invention can be shown in a table as shown in Table 5 below.

Data Rate [Kbps] RRI Symbol (IAB = 0) Increase Enable RRI Symbol (IAB = 1) Increase Disable 0 0000 N / A 9.6 0001 1001 19.2 0010 1010 38.4 0011 1011 76.8 0100 1100 153.6 0101 1101 307.2 0110 1110 614.4 0111 1111 1024 N / A 1000

In Table 5, a reverse rate indicator (RRI) symbol is a symbol transmitted from a mobile station to a base station as described above in the related art. Using this symbol, the mobile station informs the base station of the current rate. Through this, the base station checks the transmission rate information of the mobile station, and the base station is used as information for restoring data transmitted by the mobile station. The RRI symbol shown in Table 5 accommodates the transmission rate defined in the current mobile communication system. That is, the RRI symbol shown in Table 5 is configured to extend the current RRI symbol so that an IAB (Increase available bit) field, which is a field indicating a possible increase rate of the mobile station, is displayed in the first field of the RRI symbol.

Therefore, if the mobile station cannot increase the reverse data rate as follows, the first field of the RRI symbol is set to "1".

(1) the mobile station's current rate is equal to the maximum allowed rate.

(2) When the amount of data stored in the current buffer is less than the threshold set

(3) Controlled by more than one sector

In contrast, when the reverse data rate can be increased, the first field of the RRI symbol is set to "0".

The mobile station has the information of the set IAB, and controls the reverse data rate in the next frame according to the IAB and the RAB transmitted from the base station. The extended RRI symbol is referred to as a first extended RRI symbol. 3 will be described based on the function of the first extended RRI symbol.

First, the mobile station can maintain up to six active sets and continuously monitor the forward MAC channel received every frame from the active set. This will be described in more detail as follows. The active set is the base stations of the sector currently serving the mobile station, and if any one of the base stations opens a connection for transmission of traffic data with the mobile station, the base station (s) in the active set are forwarded to the mobile station. A traffic channel, a reverse traffic channel, and a reverse power control channel are allocated. However, if no connection is open, the mobile station will only monitor the control channel of the sectors. Based on this, it looks at the process according to the invention of FIG.

In step 300, the mobile station monitors a reverse activity bit (RAB) indicating congestion of the reverse link of the MAC channel. If the RAB is detected in step 300, the mobile station proceeds to step 302 to check whether the detected RAB has a value of "1". That is, when having six active sets, the mobile station checks whether any one of all forward MAC channels received from the six active sets has an RAB value of 1. If RAB has a value of 1, the process proceeds to step 306; otherwise, the process proceeds to step 304.

First, the case where RAB in all Active Sets is 0 will be described.

If the mobile station proceeds to step 304, the mobile station examines the IAB field provided to confirm whether the RRI symbol can be increased. That is, the IAB at this time is performed by checking the IAB field of the first extended RRI symbol transmitted by the mobile station to inform the base station of the transmission rate of the previous frame. The mobile station proceeds to step 306 when the IAB field is 0, that is, when it is possible to increase the RRI symbol (increased data rate), and proceeds to step 330 otherwise. The mobile station can increase the RRI and proceed to step 306 to perform the persistence test. This persistence test is used when the RAB value is broadcast from the base station. That is, when the base station controls a plurality of mobile stations at the same time, it is used to control the amount of data transmitted on the reverse link. Therefore, the base station does not perform the above process when controlling the amount of data transmitted on the reverse link for each terminal. In addition, the persistence test is a method of determining the increase or decrease according to whether a desired condition is generated by generating a random number as described in the related art.

Therefore, if the persistence test succeeds in step 306, the mobile station proceeds to step 308 to increase the reverse rate (TX rate). On the other hand, if the persistence test fails, proceed to step 330. The mobile station increases the reverse rate in step 308 and then proceeds to step 310 to compare the increased TX rate and the maximum TX rate in step 310. If the increased transmission rate is greater than the maximum transmission rate, the process proceeds to step 312 and sets the TX rate to the maximum TX rate, and then proceeds to step 330.

Next, before describing step 330, a case in which at least one RAB in the active set is 1 will be described. That is, the process proceeds from step 302 to 320.

If the mobile station proceeds to step 320, it performs a persistence test. Here too, the persistence test refers to a procedure for generating a random number and checking it as described in the related art. In addition, the persistence test is performed when all terminals connected to the base station are commonly controlled. If individual control is performed, the individual control is performed without performing the persistence test. That is, step 320 is not performed when individual control is performed. The mobile station proceeds to step 324 if the 320 test result of the persistence test is successful. Otherwise, the mobile station proceeds to step 330. Proceeding to step 324, the mobile station reduces the transmission rate. After the transmission is reduced as described above, the flow proceeds to step 326 where the reduced transmission rate is compared with the minimum transmission rate. If the reduced transmission rate is smaller than the minimum transmission rate as a result of the comparison, the operation proceeds to step 328; otherwise, the operation proceeds to step 330. In step 328, the mobile station sets the transmission rate to the minimum transmission rate and then proceeds to step 330. In this case, the lowest transmission rate may be 9.6 [kbps] set as a default, and the lowest transmission rate may be specified by a message at connection connection.

As described above, if the RAB value is 1 or all the RAB values are 0, if the process proceeds to step 330 through the above-described process, it is checked whether the current transmission rate can be increased. This inspection is carried out according to whether the above three conditions are met. That is, when all three conditions that cannot increase the rate are not satisfied, the rate can be increased when the rate is not all possible. If it is possible to increase the transmission rate as a result of the check in step 330, the flow proceeds to step 332; otherwise, the flow proceeds to step 336. First, in step 332, the mobile station sets IAB, which is a field indicating a possible increase rate of the mobile station, to 0. In step 334, the first extended RRI symbol as shown in Table 5 is set according to the set transmission rate. When the set first extended RRI symbol is set as described above, the mobile station proceeds to step 340 and transmits the set first extended RRI symbol and data together. At this time, the data is transmitted in a state where the traffic connection between the base station and the mobile station is open. That is, when the traffic connection between the mobile station and the base station is not open, only the set first extended RRI value is transmitted.

Otherwise, if it is impossible to increase the transmission rate of the test result of step 330, the flow proceeds to step 336. In step 336, the mobile station sets IAB, which is a field indicating a possible increase rate of the mobile station, to 1. In step 338, the first extended RRI is generated according to the transmission rate. In step 340, the traffic and the first extended RRI symbol are transmitted through the traffic connection.

In this case, only the traffic connection is opened, the traffic and the RRI symbol is transmitted. If no traffic connection is open, only RRI symbols are sent.

4 is a control flowchart for data transmission control of a reverse link in a base station of a mobile communication system according to an embodiment of the present invention. Hereinafter, a transmission control process of a reverse link in a mobile communication system according to the present invention will be described in detail with reference to FIG. 4.

When the mobile station transmits a request message for requesting connection open to the base station, the base station performs a process of acquiring the mobile station in step 400. Thereafter, the base station proceeds to step 402 to analyze the terminal characteristics of the mobile station (Characteristics). The base station proceeds to step 404 to analyze the characteristics of the traffic to be transmitted by the current mobile station. That is, the mobile station analyzes what quality the mobile station requires for packet data services. When the above analysis process is completed, the base station proceeds to steps 406 and 408 where the base station determines the MAC index and the ReverseRateLimit message in consideration of the characteristics of the mobile station and the application service.

In step 408, the base station configures a RateLimit portion for allocating a data rate of the reverse link to the mobile station together with the ReverseRateLimit message. When the setting of the RateLimit part is completed, the base station proceeds to step 410 to assemble the ReverseRateLimit message using the message ID and other related message fields. This means assembly for transmission to air. When the assembly is completed as described above, the base station broadcasts through a forward control channel, that is, a common channel in step 412, or transmits a message using a traffic channel.

Meanwhile, the base station receives the IAB from the mobile stations every frame. That is, the IAB included in the above-described first extended RRI symbol is received. Accordingly, the base station receives the IAB received from each mobile station and checks it in step 414. In step 416, the base station combines the remaining capacity of the current reverse channel and the IAB transmitted from each mobile station to determine the RAB to be transmitted next. At this time, the base station knows the number of mobile stations that can increase the reverse data rate through the IAB field of the first extended RRI symbol. Accordingly, the base station can efficiently set the RAB value within the capacity of the base station according to the number of mobile stations capable of increasing the reverse data rate. In this way, when the base station controls a plurality of mobile stations, the mobile station performs a persistence test for increasing or decreasing the transmission rate as shown in FIG. 3 according to the received RAB. Accordingly, the base station should generate the RAB value in consideration of the overall channel environment, the number of all mobile stations, and the transmission rates of the mobile stations. That is, when the RAB is broadcasted and transmitted, an RAB value is generated to be applied to all mobile stations in common.

On the other hand, when the base station manages the mobile stations individually, that is, when the control of the transmission rate of the individual mobile station generates the necessary RAB value for each mobile station. At this time, the RAB value generated by the base station is determined in consideration of the type of service data, priority, and available reverse link state. This enables efficient control of the reverse data rate so that the base station can increase the use efficiency of the reverse link. When the RAB is determined as described above, the base station transmits the generated RAB value in step 418.

On the other hand, the embodiment of the present invention has been described as an example that one terminal uses one wireless traffic channel. However, one terminal may use two radio traffic channels. Next, a case where one terminal has two or more traffic channels will be described.

First, when one UE has two or more traffic channels, one RAB and one IAB are commonly used for two or more traffic channels. In the following description, a case in which two different reverse traffic channels are provided, an increase possibility information of a reverse traffic channel is informed through one IAB, and a transmission rate information of each traffic channel to a base station are referred to as a "second extended RRI symbol". . The second extended RRI symbol can be configured in two ways. Hereinafter, a case in which the second extended RRI symbol is configured and its operation will be described.

As described above, in this case, when two reverse radio traffic channels are controlled using one RAB, the increase, maintenance, and decrease of the reverse data rate used simultaneously occur in the two channels. In addition, the IAB value can be loaded at one bit of the RRI symbol, for example, MSB. In addition, the other bits of the RRI symbol represent data rates of two reverse radio traffic channels.

For example, the first field of the RRI symbol is used for indicating the IAB, and the remaining 6 bits each indicate a transmission rate for the two reverse radio traffic channels by 3 bits. In the above embodiment, when the reverse data rate is divided by three bits, the configuration may be configured as in Equation 2 below.

IAB + bit rate of the first reverse channel (3 bits) + bit rate of the second reverse channel (3 bits)

As shown in Equation 2, transmission rates for the two wireless traffic channels may be divided by 3 bits. That is, three bits of the second extended RRI symbol indicate a data rate of the first reverse radio traffic channel, and another three bits indicate a data rate of the second reverse radio traffic channel. In another embodiment, the second extended RRI symbol may be configured as shown in Table 6 below. Table 6 below shows some mapping relations between Equation 2 and a second extended RRI symbol when the second extended RRI symbol consists of 7 bits.

Data Rate [Kbps] RRI Symbol R-SCH 1 R-SCH 2 Increase Enable (IAB = 0) Increase Disable (IAB = 1) 0 0 0000000 N / A 0 9.6 0000001 1000001 0 19.2 0000010 1000010 0 38.4 0000011 1000011 0 76.8 0000100 1000100 0 153.6 0000101 1000101 0 307.2 0000110 1000110 0 614.4 0000111 1000111 9.6 0 0001000 1001000 9.6 9.6 0001001 1001001 9.6 19.2 0001010 1001010 9.6 38.4 0001011 1001011 9.6 76.8 0001100 1001100 9.6 153.6 0001101 1001101 9.6 307.2 0001110 1001110 9.6 614.4 0001111 1001111 1024 3072 N / A 1000000 · · · · · · · · · · · ·

The method may be configured to include a table as shown in Table 6 in a mobile station and a base station, and to match using the configured table. That is, Table 6 is an example configured as shown in Equation 3 below.

IAB + bit rate of the first and second channels (6 bits)

With reference to <Table 6> with respect to <Equation 3> is as follows.

For example, when the second extended RRI symbol is '0001010', the IAB field, which is the first field of the second extended RRI symbol, is set to '0', thereby allowing the mobile station to increase the transmission rate of the reverse traffic channel. . In addition, the remaining 6 bits of the second extended RRI symbol is information indicating a transmission rate for the uplink 2 channel, the transmission rate of the first reverse traffic channel is 9.6kbps, the transmission rate of the second reverse traffic channel is 19.2kbps. As another example, when the second extended RRI symbol is '1001010', the mobile station cannot increase the transmission rate of the reverse traffic channel because the IAB field, which is the first field, is set to '1'. The remaining 6 bits of the second extended RRI symbol are information indicating a transmission rate for two reverse channels. The first reverse traffic channel has a rate of 9.6 kbps and the second reverse traffic channel has a rate of 19.2 kbps. As shown in Table 6, the combination of 6 bits may be used to indicate the transmission rate of each wireless traffic channel.

Secondly, one RAB is used in common and IAB is used for each reverse radio traffic channel. In this case, two IAB fields for each channel and a symbol indicating a transmission rate for each channel are transmitted. In the following description, this case is referred to as a third extended RRI symbol. Such a third extended RRI symbol can also be configured in two types.
In this case, the two reverse radio traffic channels are commonly controlled by one RAB, but the IAB value is independently set for each of the two reverse radio traffic channels, so that the reverse data rate is independently changed for each traffic channel. One bit of the third extended RRI symbols is an IAB value for the first reverse wireless traffic channel, and another bit of the third extended RRI symbols is an IAB value for the second reverse wireless traffic channel. In addition, 3 bits among the remaining bits except the 2 bits indicating the IAB of the third extended RRI symbols indicate the data rate of the first radio traffic channel, and the other 3 bits indicate the data rate of the second radio traffic channel. That is, as shown in Equation 2, it can be configured to represent the transmission rate for each wireless traffic channel by three bits.

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Next, an embodiment in which the third extended RRI symbol is configured differently from the above will be described. As shown in Equation 3, the third extended RRI symbol may be configured to inform the base station through a combination of 6 bits. That is, a table as shown in Table 6 may be provided together at the mobile station and the base station to perform the matching on the transmission rate to configure the RRI symbol.

As described above, the mobile station can independently set the IAB for the two reverse radio traffic channels in the case where the third extended RRI symbol consists of 3 bits and informs about the two radio traffic channels in 6 bits. In addition, the mobile station can independently change the transmission rate of each reverse radio traffic channel according to the IAB value for the RAB commonly received from the base station and each reverse radio traffic channel.

In case of having each of the IABs, a part of the third extended RRI table provided in the mobile station and the base station is shown in a table as an example.

Data Rate [Kbps] RRI Symbol R-SCH 1 R-SCH 2 IAB1 = 0 IAB2 = 0 IAB1 = 0 IAB2 = 1 IAB1 = 1 IAB2 = 0 IAB1 = 1 IAB2 = 1 0 0 00000000 N / A N / A N / A 0 9.6 00000001 01000001 10000001 11000001 0 19.2 00000010 01000010 10000010 11000010 0 38.4 00000011 01000011 10000011 11000011 0 76.8 00000100 01000100 10000100 11000100 0 153.6 00000101 01000101 10000101 11000101 0 307.2 00000110 01000110 10000110 11000110 0 614.4 00000111 01000111 10000111 11000111 9.6 0 00001000 01001000 10001000 11001000 9.6 9.6 00001001 01001001 10001001 11001001 9.6 19.2 00001010 01001010 10001010 11001010 9.6 38.4 00001011 01001011 10001011 11001011 9.6 76.8 00001100 01001100 10001100 11001100 9.6 153.6 00001101 01001101 10001101 11001101 9.6 307.2 00001110 01001110 10001110 11001110 9.6 614.4 00001111 01001111 10001111 11001111 1024 307.2 N / A N / A N / A 11000000 . . . . . . . . . . . . . . . . . .

Table 7 is a table including IABs for each radio traffic channel as described above, and 6 bits are matched to indicate transmission rates for each traffic channel. That is, some mapping relationships in the case where the third extended RRI sysmbol consists of 8 bits are shown. This will be described in detail again with reference to Table 7 above.

The first field of the third extended RRI symbol is used for indicating the IAB of the first reverse traffic channel, and the second field of the third extended RRI symbol is used for indicating the IAB of the second reverse traffic channel. The remaining 6 bits represent the transmission rates of two reverse radio traffic channels. For example, when the third extended RRI symbol is '00001010', the mobile station can increase the transmission rates in both the first reverse traffic channel and the second reverse traffic channel, and the current rate of the first reverse traffic channel is 9.6 kbps. The second reverse traffic channel has a transmission rate of 19.2 kbps.

As another example, when the third extended RRI symbol is '01001010', the mobile station may increase the transmission rate of the first reverse traffic channel, but cannot increase the transmission rate of the second reverse traffic channel. The transmission rate of the channel is 9.6kbps and the transmission rate of the second reverse traffic channel is 19.2kbps. As another example, when the third extended RRI symbol is '10001010', the mobile station may not increase the transmission rate of the first reverse traffic channel, but may increase the transmission rate of the second reverse traffic channel. The transmission rate of the traffic channel is 9.6kbps, and the transmission rate of the second reverse traffic channel is 19.2kbps.

As another example, when the third extended RRI symbol is '11001010', the mobile station cannot increase the transmission rates in both the first reverse traffic channel and the second reverse traffic channel, and the transmission rate of the current first reverse traffic channel is 9.6. kbps, and the transmission rate of the second reverse traffic channel is 19.2 kbps.

Third, it has a separate RAB corresponding to each radio traffic channel and uses RRI symbol 7 bits. That is, when two radio traffics are used, two RABs are used. In this case, RABs are allocated to two reverse radio traffic channels, and data rates of two reverse radio traffic channels may be changed independently. And only one IAB value is set for two reverse wireless traffic channels. In addition, the use of the RRI symbol indicating the transmission rate of each traffic channel is the same as in the first case. That is, it is configured as shown in Table 6 or as shown in Equation 2. Therefore, the second extended RRI symbol is used.

The mobile station adjusts the data rate using the RAB information assigned to each of the reverse radio traffic channels. However, the IAB setting can be used for both reverse wireless traffic channels to adjust the transmission rate.

Fourthly, there is a case in which a separate RAB corresponding to each radio traffic channel is provided, and at the same time, an IAB symbol is provided for each radio traffic channel. That is, when the RRI symbol uses 8 bits as shown in Table 7 above, or has IAB fields according to the respective traffic channels, the RRI symbol is 3 bits corresponding to each traffic channel. It is a case.

In this case, RABs are allocated to the two reverse radio traffic channels, respectively, and IAB values are individually set. Therefore, two reverse radio traffic channels may be independently controlled as in the case of controlling one reverse radio traffic channel.

Additionally, the IAB value of the reverse radio traffic channel may be transmitted through not only the RRI channel shown in the embodiment of the present invention but also other channels, for example, a channel such as an RICH. It is also possible to define and use a new channel in addition to the channel described above. At this time, the transmission period is ideally framed, but may be arbitrarily adjusted without placing a limitation on the transmission period.

Meanwhile, the embodiment of the present invention shows individual power control for only one and two channels, but can be used for the three or more channels by using the above methods. In addition, although the transmission rate of each channel is expressed by 3 bits, it may be expressed as 4 bits or more depending on the type of each transmission rate. Such changes can be easily made by those skilled in the art using the concept of the present invention.

As described above, the mobile station informs the base station of the mobile station, and the base station performs transmission control of the reverse link through the base station, thereby increasing the use efficiency of the reverse link. There is also an advantage in that this can be done while minimizing overhead by using extended RRI for status messages received from the mobile station.

Claims (38)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete A method for controlling a data rate of data to be transmitted by a mobile station by receiving a forward information indicating an increase or a decrease in a data rate of the mobile station through a forward channel from a base station to a mobile station, the method comprising: When the forward information indicates an increase in the data rate, checking whether the rate increaseable information transmitted by the mobile terminal through the reverse channel before receiving the information indicates an increase in the data rate; When the rate increase information indicates the increase in the data rate, the mobile terminal includes transmitting data in a reverse direction by setting a data rate higher than the current data rate in a range within a maximum data rate. Transmission control method of reverse link in system. The method of claim 19, And transmitting the set data rate information through a reverse channel when transmitting data in the reverse direction. The method of claim 20, And transmitting the reverse data rate information when the reverse transmission is performed through two or more channels. The method of claim 19, And checking the possibility of increasing the reverse data rate, setting the rate increase possible information, and transmitting the information through the reverse channel. The method of claim 22, Checking whether the reverse data rate can be increased, Mobile communication characterized in that the increase of the transmission rate is set to be impossible when the current transmission rate of the mobile terminal is equal to the maximum allowable transmission rate or is less than or equal to the threshold value set by the amount of data stored in the current buffer or is controlled in two or more sectors. Transmission control method of reverse link in system. The method of claim 22, Checking whether the reverse data rate can be increased, And increasing the transmission rate when the transmission power of the mobile terminal cannot accommodate the increase in the transmission rate. The method of claim 22, When the reverse data transmission is performed through two or more channels, the transmission control method of the reverse link in the mobile communication system, characterized in that all the check whether the data rate of each reverse channel is possible to increase and transmits it as one bit. The method of claim 22, When the reverse data transmission is performed through two or more channels, the transmission control of the reverse link in the mobile communication system is characterized by checking whether all data rates of each reverse channel can be increased or not, and configuring each of them as possible information. Way. The method of claim 19, Performing, by the mobile terminal, a PV test when the rate increaseable information indicates an increase in the data rate; If the PV test is successfully performed, the mobile station transmits the reverse link in the mobile communication system by setting a data rate higher than the current data rate within the maximum data rate. Control method. The method of claim 19, And when the forward information indicates a decrease in the data rate, the mobile station further includes transmitting data in a reverse direction by setting a data rate lower than the current data rate within a range within a minimum data rate. Method of controlling transmission of reverse link in. The method of claim 19, In the mobile communication system, when the forward information indicates a decrease in data rate, data is transmitted by setting a data rate lower than the current data rate within the minimum data rate range only when the PV test is successful. Transmission control method of link. The method of claim 19, The forward information is a transmission control method for the reverse link in a mobile communication system, characterized in that for transmitting the same value in common to each terminal. The method of claim 19, The forward information is a transmission control method for a reverse link in a mobile communication system, characterized in that for transmitting each value to each terminal individually. A method of controlling a reverse data rate of a mobile terminal after receiving information capable of increasing a reverse data rate from a mobile terminal, the method comprising: Checking a reverse data rate increaseable information value received from the mobile station and a backward capacity; And determining the forward information indicating the increase or decrease of the data rate of the mobile station by using the test result, and transmitting the same to the terminal. 33. The method of claim 32, When one mobile terminal transmits data through two or more reverse links, the reverse active bit transmission control method of the mobile communication system, characterized in that the reverse active bit is determined by checking all information capable of increasing the reverse data rate. 33. The method of claim 32, When one mobile terminal transmits data through two or more reverse links, the forward link transmission control method of the mobile communication system, characterized in that for generating the forward information for each reverse link, respectively. 33. The method of claim 32, The forward information is a transmission control method for the reverse link in a mobile communication system, characterized in that for transmitting the same value in common to each terminal. 33. The method of claim 32, The forward information is a transmission control method for a reverse link in a mobile communication system, characterized in that for transmitting each value to each terminal individually. A mobile terminal apparatus for controlling a data transmission rate of data to be transmitted by the mobile terminal by receiving the forward information indicating the increase or decrease of the data transmission rate of the mobile terminal through a forward channel from a base station to the mobile terminal, An apparatus for checking whether the rate increaseable information transmitted by the mobile terminal through the reverse channel before receiving the information indicates the increase in the data rate when the forward information indicates the increase in the data rate; The mobile terminal includes a device for transmitting data in a reverse direction by setting a data rate higher than the current data rate in a range within a maximum data rate when the rate increaseable information indicates an increase in the data rate. Device. In the base station apparatus for controlling the reverse data rate of the mobile terminal after receiving information capable of increasing the reverse data rate from the mobile terminal, An apparatus for checking a reverse data rate increaseable information value received from the mobile terminal and a backward capacity; And a device for determining forward information indicating an increase or decrease of a data transmission rate of the mobile terminal using the test result and transmitting the same to the terminal.

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