Method of adjusting transmit window size on radio channel control level

FIELD: physics.

SUBSTANCE: transmitting side on the radio channel control level determines the efficiency of using the transmission band and actively adjusts the size of the transmit window in accordance with the efficiency of using the transmission band of the radio channel.

EFFECT: prevention of reduction in the efficiency of using the transmission band of a channel.

9 cl, 3 dwg

 

The technical field to which the invention relates.

The present invention relates to the management of radio channels in a cellular system mobile (mobile phones), in particular to a method for adjusting the window size transmit control channels.

Background of invention

Control Protocol radio Protocol (RLC, where RLC = Radio Link Control) is a control Protocol that is based on a window of variable size, which is used to control the transmission by radio of the data packet, as shown in figure 1. The transmitting RLC-hand the term "block with cross-offsets" indicates a data packet, which has confirmed that it has not been received by the opposite party, and which must be retransmitted; the term "blocks with no reception" indicates a data packet, the acknowledgement of which the opposite side is expected, and the term "empty blocks" means unused buffers. The receiving RLC-hand the term "block with cross-offsets" means the package of data that is lost during transmission to the opposite side and should be taken again; the term "blocks with no reception" indicates the received data packet, and the term "empty blocks" refers to the unused buffer.

The following are the major changes is haunted management Protocol radio (RLC Protocol):

Configured_Tx_Window_Size: the initial value of the transfer window, configured for transmitting the RLC-side Protocol of the highest level, and the maximum size of the transfer window unit represented by a sequence of Protocol data units PDU (PDU - Protocol Data Units); however, the transmitting RLC-side accesses to the transmit buffer in accordance with this variable.

VT(S): state variable transmission, which represents the sequence number of the next module data Protocol PDU that you want to convey, without consideration of re-transmitted data module Protocol (PDU).

VT(A): the variable status confirmation representing a sequence number of the next in sequence module data Protocol (PDU), the proof of which is expected by the receiving party.

VT(MS): variable maximum transmission condition; if the serial number of the module data Protocol (PDU) exceeds this value, or equal to, the transfer module data Protocol is not permitted, and VT(MS)=VT(A)+VT(WS).

VT(WS): the transmission window size, and its initial value, which is also the maximum value, equal to Configured_Tx_Window_Size, and the lowest value is 1 or the value configured other higher level, and the value of VT(WS) is changed within this range.

Configured_Rx_Window_Size: the size of the initial receive window configured for taking the ment RLC-side Protocol of the higher level, moreover, the block is represented by a sequence of Protocol data units (PDUs); RLC uses the receive buffer in accordance with this variable.

VR(R): the variable status of the reception, which represents the sequence number of the next in sequence module data Protocol (PDU), subject to acceptance.

VR(H): state variable reception with the highest expectation, which represents the highest sequence number module data Protocol (PDU), which is expected.

VR(MR): the highest allowable reception status; if the serial number of the module data Protocol (PDU) exceeds this value, or equal to, the receiving RLC-side refuses to accept the module data Protocol, and

VR(MR)=VR(R)+Configured_Rx_Window_Size.

The receiving RLC-party notifies the transmitting RLC-side service status PDU (PDU)that some packets are accepted, and some packages are not accepted. After receiving the package status PDU, the transmitting RLC-side changes the value of the state variable confirm VT(A) and passes a variable maximum transmission condition VT(MS)to ensure seamless transfer of data.

If the transmitting RLC-side detects that the receiving party has not responded to some module data Protocol (PDU), such as a block with cross-offsets on the transmitting RLC-side in figure 1, then the value of the variable is the transmission condition VT(S) continuously increases, until it reaches the value of a variable maximum transmission condition VT(MS), and then data with a sequence number equal to the value of VT(MS) or greater than this value are not passed.

If the receiving RLC-party discovers that a certain module data Protocol (PDU), such as a block with cross-offsets on the receiving RLC-side in figure 1, then the value of the state variable reception with the highest expectation VR(H) continuously increases until it reaches the value of a variable maximum allowable reception status VR(MR), and then data with a sequence number equal to the value of VR(MR) or greater than this value will not be accepted.

The current RLC Protocol provides the following: receiving RLC-side depending on the state of their own receive window controls the window size for data transmission of the transmitting RLC-side, thereby controlling the bandwidth of the radio channel. The Protocol scheme contains information indicator window size information SUFI about window size) in the package status PDU sent from the transmitting RLC-side, and after transmitting the RLC-party receives information about SUFI window size changes the size of the transfer window VT(WS) for WSN. If the value of the WSN is zero, the information SUFI is ignored; if the value of WSN exceeds the largest window size p is passing Configured_Tx_Window_Size, the size of the transfer window VT(WS) is set equal Configured_Tx_Window_Size. If the communication channel degrades, the data may be lost, leading to an increase in the buffer on the receiving RLC-side. At this time, the receiving RLC-side reduces the transmission data from the transmitting RLC-hand, using the information SUFI about the size of the window, and notifies the transmitting RLC-side about the need to reduce the size of the transfer window VT(WS), thereby reducing the size of the transfer window and excluding the channel congestion. When the receiving RLC-party finds that the available size of the receive buffer is constantly increasing up to certain threshold values, as shown in figure 2, while all the retransmitted packets received and the receiving RLC-side does not require the buffer to use, the receiving RLC-side similarly notifies the transmitting RLC-side about the need to increase the size of the transfer window VT(WS), resulting in the transfer window size increases and eliminates the less efficient use of bandwidth of the data transmission channel.

In accordance with the performed measurements of various services and the probability of loss of the module data Protocol (PDU) for some data services provided in real time, can reach 10%. With good radio RLC Protocol prescribes the button the probability of loss of the module data Protocol (PDU) does not exceed 0.7 percent. Hence, by the results of the comparison, the probability of information loss SUFI about the size of the window above. However, in accordance with the provisions of this Protocol, the transferor does not "see" the bandwidth of the radio channel and adjusts the transmission window size only in accordance with the requirements contained in information about SUFI window size received from the host. Thus, if you have lost information about SUFI window size, the transferor is not set window size on its own initiative. Moreover, the RLC Protocol there is no universal criterion for inclusion of information about SUFI window size, and after a single inclusion of such information may take a long time before its next activation. In particular, if the state of the radio channel becomes good and the probability of packet loss is reduced, the information about SUFI window size can be generally not included, and during this period, even with good channel, data may be transmitted over the air at a slower speed, thereby greatly reducing the efficiency of the radio channel.

The invention

The present invention provides a method for adjusting the window size transmit control channels to effectively combat these shortcomings of existing protocols level as full control of the use bands of the bandwidth of the radio channel on the receiving side, so there is no time to adjust the transmission window size due to loss of information about SUFI window size, resulting in less efficient use of bandwidth management Protocol radio channels.

The present invention provides a method for adjusting the window size transmit control channels, wherein the transmitting RLC-side controls the bandwidth of the radio channel, periodically taking the decision about the necessity of adjusting the transmission window size and adjusting the size of the transmission window for transmitting the RLC-side, if there is a decrease in the efficiency of bandwidth usage.

Step periodic decision-making about the need to adjust the size of the transmission window for transmitting the RLC-side includes:

Step 1: set the threshold of N depending on the state of the radio channel.

Step 2: the periodic measurement of the ratio K state variable transmission VT(S) and state variable confirm VT(A), the maximum transmission window size Configured_Tx_Window_Size on the transmitting RLC-side, and the ratio K is the ratio of the relative distances between VT(S) and VT(A) to the value Configured_Tx_Window_Size;

Step 3: compare the ratio of K with a threshold N and determine whether to adjust the transmission window size, if the ratio K is less than the threshold N; in rotinom case, return to step 2.

Steps to adjust the size of the transmission window for transmitting the RLC-side include:

Step 1: determine the values of W on the transmitting RLC-side, i.e. the transmission window size, which can be provided by radio, and

Step 2: comparison of the transfer window size VT(WS) with a value of W and, if the value of VT(WS) is less than W, the value VT(WS) is equal to W.

According to the present invention the transmitting RLC-side does not rely on information about SUFI window size transmitted, the receiving RLC-side, and determines the state of the bandwidth usage of the radio channel depending on its own state variables and, thus, adjusts the size of the transfer window. This allows you to eliminate the drawback consisting in the absence of timely adjustment of the transmission window size when loss of information about SUFI window size, and to quickly adjust the size of the transfer window, in order to ensure full and efficient use of bandwidth radio channels.

Brief description of drawings

Figure 1 is a schematic representation of the Protocol control channel.

Figure 2 is a diagram of the receiving RLC-party notifies the transmitting RLC-side about the need to change the transfer window, sending the package States, containing information about SUFI window size.

Figure 3 is and what gorithm method according to the present invention.

A detailed description of the preferred implementation of the invention

Below is a more detailed description of the present invention with reference to the accompanying drawings.

The basic idea of the present invention consists in determining the state of the buffer on the receiving RLC-side by periodic measurement of the correlation between variables at the transmitting RLC-side. As shown in figure 1, if confirmed by the loss of the data PDU to the transmitting RLC-side block with cross displacements, the relative distance between a state variable confirm VT (a) and a state variable transmission VT (S) is incremented, and the completion of the transfer buffer is gradually increasing. As on the receiving RLC-side data loss occurs PDU as a block with cross displacements, the relative distance between a state variable receiving VR(R) and state variable reception with the highest expectation VR(H) is incremented, and fill the transmit buffer at the receiving side is gradually increasing.

However, due to delays in the channel variable reception status with higher expectation VR(H) will not exceed the value of the state variable transmission VT(S), and the value of the variable status confirmation VT(A) will not exceed the value of a variable condition of receiving VR(R). It should also be noted that the relative distance is between a variable of the reception status VR(R) and state variable reception with the highest expectation VR(H) is definitely not to exceed the relative distance between a state variable confirm VT(A) and a state variable transmission VT(S), ie:

(4096+VT(S)-VT(A)mod4096=(4096+VR(H)VR(R))mod4096.

But for the configuration of the shared variables of the RLC Protocol is:

Configured_Rx_Window_Size = Configured_Tx_Window_Size.

In the Protocol 3GPP TS 25.306 this means that the transmit buffer RLC shall be used in accordance with the transfer window and the receive buffer RLC - in accordance with the receive window. Moreover, because Configured_Tx_Window_Size and Configured_Rx_Window_Size are the initial values of the transfer window and receive window RLC, when installed in the radio resource, the transmit buffer, of course, corresponds Configured_Tx_Window_Size, and the receive buffer is Configured_Rx_Window_Size. Therefore, the state of occupancy of the buffer on the receiving RLC-side can determine, periodically measuring the attitude Towards the state variable transmission VT(S) and state variable confirm VT(A), the maximum transmission window size Configured_Tx_Window_Size on the transmitting RLC-side. Even if Conrigured_Rx_Window_Size < Configured_Tx_Window_Size, with respect To the state variable transmission VT(S) and state variable confirm VT(A), the maximum transmission window size Configured_Tx_Window_Size you can also change, tune the weighting factor R. If you compare the ratio To a threshold N is an inequality, for example, "less than", then the transmitting RLC-side can be made smaller filling in the buffer of the receiving RLC-hand, and then may be determined by the size of the transfer window VT(WS; if VT(WS) is less than W, the size of the transmission window may be provided with a radio channel. This shows that the bandwidth of the radio channel is not enough, and need to install VT(WS) on W, i.e. on the size of the transfer window, which can be provided by the channel.

Detailed steps according to the present invention are presented in figure 3.

Step 1: set the threshold N, and the threshold is usually N is very small, which can be estimated depending on the transfer window and from the requirements to the speed of transmission over the air; however, preferably, the threshold is about 10.

Step 2: periodically determine if information about SUFI window size for transmitting the RLC-side; if Yes, go to step 8, otherwise go to step 3.

Step 3: the periodic measurement of the ratio K state variable transmission VT(S) and state variable confirm VT(A), the maximum transmission window size Configured_Tx_Window_Size on the transmitting RLC-side, with respect To is the ratio of the relative distances between VT(S) and VT(A) to Configured_Tx_Window_Size.

Step 4: compare the ratio of K and threshold N; if the ratio K is less than the threshold N, which indicates the need to increase the size of the transfer window, then go to step 5; otherwise, return to step 2.

Step 5: calculation of the transfer window size W, which can be provided by channel, depending on eromenoi the transmission condition VT(S), state variable confirm VT(A) and the maximum transmission window size Configured_Tx_Window_Size; or set in advance on the transmitting RLC-side of the corresponding relation between K and W and direct determination of the appropriate transfer window size W depending on the value of K.

Step 6: comparison of the transfer window size VT(WS) and W; if VT(WS)<W, then go to step 7; otherwise, go to step 2.

Step 7: set the value of a variable VT(WS)is equal to W, and go to step 2.

Step 8: set the value VT(WS)is equal to the value of WSN in the last received information about SUFI window size, and return to step 2 to continue the measurements.

The process described above is performed during the whole period of the transmitting RLC-side, while you are connected to the transmitting RLC-party.

The following describes an example implementation of the invention, in which the attitude is calculated using the following formula:

if K>100, K=100; and in this formula R is the weight ratio satisfying the following condition:

And the value of W, the transmission window size, which can be provided by the channel can be calculated as follows:

and use after rounding the value calculated according to the formula above, to the nearest smaller values.

The threshold is set ka is N=10; if K<N, the transmission window size increases. It is assumed that Configured_Tx_Window_Size = 512, Configured_Rx_Window_Size = 512, the transmission window size VT(WS), defined at the transmitting RLC-side equal to 1, the state variable transmission VT(S) = state variable confirm VT(A)=300.

This process can be implemented as follows:

setting the threshold N=10; the transferor does not receive information about SUFI window size, then the periodic determination of the value of the relationship To, here K=0; determining whether the values of K and N the condition to increase the size of the window; as K<N, the transmission window size should be increased; the calculation of the W value, the transmission window size, which may be provided with a channel, W = Configured_Tx_Window_Size = 512;

comparison of the transfer window size VT(WS) from W, which gives the inequality VT(WS)<W; setting the size of the transfer window VT(WS)is equal to W, 512; then the continuation of the measurements.

You need to keep in mind that the above-described implementations of the invention are intended only to illustrate the technical solutions according to the present invention and in no way limit the present invention. Although the present invention is described with reference to preferred implementations of the invention, a specialist in the technical field should understand that the technical solutions according to the present invention can be modified or replaced by the like without departing from the spirit and scope of the present invention and that all modifications and replacements are covered by the volume formula of the present invention.

1. The method of adjusting the transmission window size on the control radio channel, characterized in that the transferor at the level of the control channels determines the efficiency of the bandwidth usage of the radio channel and actively adjusts the transmission window size in accordance with the effective use of the bandwidth of the radio channel.

2. The way to adjust the size of the transmission window according to claim 1, characterized in that it includes the step of periodically determining the transmitting side at the level of the control channels, do I need to adjust the size of the transfer window.

3. The way to adjust the size of the transmission window according to claim 2, characterized in that the step of periodically determining the transmitting side at the level of the control channels, do I need to adjust the size of the transfer window, including:

step 1: set the threshold of N depending on the state of the radio channel; step 2: the periodic measurement of the transmitting side at the level of the control channels of the relationship To the state variable transmission VT(S) and state variable confirm VT(A), the maximum transmission window size Configured_Tx_Window_Size, and the ratio K is the ratio of the relative distances between VT(S) and VT(A) to Configured_Tx_Window_Size; and step 3: compare the ratio of K with a threshold N and the step of adjusting the transmission window size, if the relationship is of K is less than the threshold N; otherwise, return to step 2.

4. The method of adjusting the window size transmit control channels according to claim 3, characterized in that the threshold N is set according to the transmission window size and to speed transmission on the radio channel.

5. The method of adjusting the window size transmit control channels according to claim 3, characterized in that the ratio K is calculated by the following formula:

if K>100, set K=100; where P is the weight ratio satisfying the following condition:

6. The method of adjusting the window size transmit control channels according to claim 3, characterized in that the steps for adjusting the size of the transmission window of the transmitter side at the level of the control channels include: step 1: identification of the transmitting side at the level of the control channels of the transmission window size, which can be provided by the radio channel, and step 2: comparison of the transfer window size VT(WS) from W and, if VT(WS) is less than W, then the assignment VT(WS)equal to W.

7. The method of adjusting the window size transmit control channels according to claim 6, characterized in that the transferor at the level of the control channels calculates the transmission window size W, depending on the state variable transmission VT(S), paramonotone confirmation VT(A) and the maximum transmission window size Configured_Tx_Window_Size; or determined in accordance with the relevant value, a predetermined transmitting side at the level of the control channels in the range from W to relations To the state variable transmission VT(S) and state variable confirm VT(A), the maximum transmission window size Configured_Tx_Window_Size.

8. The method of adjusting the window size transmit control channels according to claim 7, characterized in that the transmission window size W can be calculated by the following formula:

where P is a weighting factor, satisfying the condition:

after rounding to the nearest smaller values can be used W.

9. The method of adjusting the window size transmit control channels according to claim 2 or 3, characterized in that before the transferor at the management level of the radio will step periodically determine whether to adjust the transmission window size, first periodically determine if information is collected SUFI about the size of the window; if it is received, the transmission window size VT(WS) is set equal to the value of WSN in the last received information about SUFI window size; if this information is not received periodically determine the need to adjust the size of the transfer window.



 

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