CN110012505B - Radio link control layer window determination method and device - Google Patents

Abstract

The invention discloses a method and a device for determining a wireless link control layer window, wherein the method comprises the following steps: receiving a radio link control layer protocol data unit (RLC PDU), wherein the RLC PDU comprises a Serial Number (SN); judging whether SN overturning occurs or not according to the SN; and if the SN is determined to be turned over, determining the SN value range falling into a window corresponding to the Radio Link Control (RLC) layer when the SN is turned over. The RLC can maintain the window with a fixed size when SN (service provider) overturn occurs, and the problems of retransmission, time delay, packet loss and the like in data transmission are avoided.

Description

Radio link control layer window determination method and device

technical field

The present invention relates to the field of communication technologies, and in particular, to a method and device for determining a window of a radio link control layer.

Background technique

The radio link control layer RLC maintains a window based on the window state variable. According to the provisions of the RLC 38.322 protocol, the values of all window state variables related to data transmission operations in the RLC are subject to the sequence number SN included in the radio link control layer protocol data unit RLC PDU. For example, SN=6bit, the corresponding window state variable value range is 0～63 (2 ^SN -1).

However, in the fifth generation (5G) mobile communication system, if SN inversion occurs (for example, the SN included in the currently transmitted RLC PDU is the same as the SN included in the previously transmitted RLC PDU), according to the existing RLC 38.322 According to the provisions of the protocol, the window corresponding to RLC is reduced, which leads to problems such as retransmission, delay, and packet loss during data transmission.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a method and an apparatus for determining a window of a radio link control layer, so that the RLC can maintain a fixed-size window when an SN rollover occurs, so as to avoid retransmission, delay, and packet loss in data transmission. And other issues.

In a first aspect, a method for determining a radio link control layer window is provided, including:

receiving a radio link control layer protocol data unit RLC PDU, wherein the RLC PDU includes a sequence number SN;

According to the SN, determine whether the SN rollover occurs;

If it is determined that the SN inversion occurs, it is determined that the SN value range falls within the window corresponding to the RLC of the radio link control layer when the SN inversion occurs.

In a second aspect, an apparatus for determining a radio link control layer window is provided, including:

a receiving module, configured to receive a radio link control layer protocol data unit RLC PDU, wherein the RLC PDU includes a sequence number SN;

a judging module for judging whether an SN flip occurs according to the SN;

The determining module is configured to, when it is determined that the SN inversion occurs, determine the SN value range that falls within the window corresponding to the RLC of the radio link control layer when the SN inversion occurs.

In a third aspect, a radio link control layer window determination apparatus is provided, the radio link control layer window determination apparatus includes a processor, a memory, and a radio link stored on the memory and operable on the processor A link control layer window determination program, which implements the steps of the method according to the first aspect when the radio link control layer window determination program is executed by the processor.

In a fourth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores a radio link control layer window determination program, and the radio link control layer window determination program is executed by a processor. The steps of the method of one aspect.

In the embodiment of the present invention, by receiving the radio link control layer protocol data unit RLCPDU including the sequence number SN, it is then judged whether the SN inversion occurs according to the SN, and when it is determined that the SN inversion occurs, it is determined that the SN inversion occurs when the SN inversion occurs. The value range of the SN in the window corresponding to the RLC of the link control layer, so that the RLC can maintain a fixed-size window when the SN flip occurs, avoiding problems such as retransmission, delay, and packet loss in data transmission.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic flowchart of a method for determining a radio link control layer window according to an embodiment of the present invention;

2 is a schematic structural diagram of an apparatus for determining a radio link control layer window according to an embodiment of the present invention;

3 is a schematic structural diagram of a network device provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a terminal device provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to a 5G system.

FIG. 1 is a schematic flowchart of a method for determining a radio link control layer window according to an embodiment of the present invention. Method 100 includes:

Step S110: Receive a radio link control layer protocol data unit RLC PDU, wherein the RLC PDU includes a sequence number SN.

In practical applications, the RLC layer is located above the media access control layer MAC, and below the radio resource control layer RRC and the packet data convergence protocol layer PDCP, which is a bridge for communication between the MAC layer and higher layer protocols.

After the RLC receives the RLC PDU, it determines the SN included in the RLC PDU.

Step S120, according to the SN, it is judged whether the SN inversion occurs.

In step S130, if it is determined that the SN inversion occurs, it is determined that the SN value range falls within the window corresponding to the RLC of the radio link control layer when the SN inversion occurs.

The RLC entity is configured by the upper layer RRC, and is divided into three working modes according to the service type: transparent mode TM, unacknowledged mode UM and acknowledged mode AM. The TM RLC and the UM RLC are respectively divided into a sending entity and a receiving entity, and the AM RLC is a single entity, divided into a sending end and a receiving end.

The embodiments of the present invention can be applied to a UM RLC receiving entity, a receiving end of an AM RLC entity, and a transmitting end of an AM RLC entity.

For RLCs in different working modes, there are different ways of judging whether an SN inversion occurs and determining the SN value range that falls in the window corresponding to the RLC when an SN inversion occurs. The following is a detailed description of the RLCs in different working modes:

The first type: for the UM RLC receiving entity, and when the reassembly window corresponding to the UM RLC receiving entity is stable

In this embodiment of the present invention, according to the SN, judging whether an SN rollover occurs, including:

According to the SN, determine the first window state variable RX_Next_Highest corresponding to the UM RLC receiving entity, and the reassembly window size UM_Window_Size corresponding to the UMRLC receiving entity;

Determine whether the first window state variable RX_Next_Highest satisfies the following conditions:

RX_Next_Highest-UM_Window_Size<0;

If so, it is determined that an SN rollover has occurred.

After receiving the RLC PDU, the UM RLC receiving entity determines the sequence number SN included in the RLC PDU. For example, after receiving the RLC PDU including the sequence number SN=2, the UMRLC receiving entity determines SN=2.

In practical applications, some RLC PDUs received by the UM RLC receiving entity may not include the SN, and subsequent processing is not required for the RLC PDUs that do not include the SN.

At present, the UM RLC receiving entity maintains a reassembly window with a reassembly window size of UM_Window_Size based on the first window state variable RX_Next_Highest. The existing method for determining the reassembly window is: the value range of the SN in the reassembly window corresponding to the UM RLC receiving entity for:

RX_Next_Highest-UM_Window_Size≤SN<RX_Next_Highest.

Among them, the value of the first window state variable RX_Next_Highest is related to the field length sn-FieldLength of SN and SN, RX_Next_Highest=(SN+1)modulo(2 ^{sn-FieldLength} ); the size of the reorganization window occupies half of the SN space, UM_Window_Size=2 ^{(sn-FieldLength)-1} .

For the UM RLC receiving entity, when the reassembly window reaches stability, that is, when the value range of the reassembly window reaches the maximum, it is determined whether SN rollover occurs.

For example, SN=63 is determined according to the received RLC PDU, and the field length of the SN is sn-FieldLength=6 bits.

The first window state variable RX_Next_Highest is:

RX_Next_Highest=(63+1)module(2 ⁶ )=0;

The reorganized window size UM_Window_Size is:

UM_Window_Size=2 ^6-1 =32

At this time, RX_Next_Highest-UM_Window_Size=0-32=-32<0, if according to the existing window determination method, the value range of the SN in the reassembly window corresponding to the UM RLC receiving entity is: -32≤SN<0 , since there is no situation of SN<0, it is determined that SN inversion occurs when the UM RLC receiving entity transmits the RLC PDU.

If the SN rollover occurs when the UM RLC receiving entity transmits the RLC PDU, the methods for determining the SN value range in the reassembly window corresponding to the UM RLC receiving entity when the SN rollover occurs include but are not limited to the following two:

way a:

In this embodiment of the present invention, if it is determined that an SN inversion occurs, it is determined that the SN value range that falls in the window corresponding to the RLC of the radio link control layer when the SN inversion occurs, including:

Update the first inversion indicator variable flag_um corresponding to the UM RLC receiving entity to obtain the updated first inversion indicator variable flag_um, wherein the first inversion indicator variable flag_um is used to indicate the number of times that SN inversion occurs;

According to the updated first reversal indicator variable flag_um, it is determined that the SN value range that falls in the reassembly window corresponding to the UMRLC receiving entity when the SN reversal occurs is:

Wherein, i=[0, flag_um], and sn-FieldLength is the field length of the SN.

Set the UM RLC receiving entity to jointly maintain a reassembly window through the first window state variable RX_Next_Highest and the first rollover indicator variable flag_um. The value range of the SN falling in the reassembly window corresponding to the UM RLC receiving entity is:

Wherein, the initial value of the first flip indicator variable flag_um is 0.

After the UM RLC receiving entity starts to transmit RLC PDUs, if no SN rollover occurs, that is, if RX_Next_Highest-UM_Window_Size ≥ 0, the first rollover indicator variable flag_um maintains the initial value of 0 and falls within the reassembly window corresponding to the UMRLC receiving entity The value range of SN in is:

RX_Next_Highest-UM_Window_Size≤SN<RX_Next_Highest;

When the SN rollover occurs for the first time in the RLC PDU transmitted by the UM RLC receiving entity, that is, when RX_Next_Highest-UM_Window_Size<0 occurs for the first time, the first rollover indicator variable flag_um is updated, specifically by increasing the preset step size, for example, increasing the step size 1. Obtain the updated first flip indicator variable flag_um=1, then the value range of the SN in the reorganization window corresponding to the UM RLC receiving entity is:

Among them, i=[0,1];

When the SN rollover occurs for the second time in the transmission of the RLC PDU by the UM RLC receiving entity, that is, when RX_Next_Highest-UM_Window_Size<0 occurs for the second time, the first rollover indicator variable flag_um is updated again, specifically to increase the preset step size, for example, increase the step size Length 1, the updated first flip indicator variable flag_um=2 is obtained, then the value range of the SN in the reorganization window corresponding to the UM RLC receiving entity is:

Among them, i=[0,2];

By analogy, with the increase of the number of SN rollovers, the value range of the SN falling in the reassembly window corresponding to the UM RLC receiving entity is continuously adjusted, so as to maintain a fixed size window when the SN rollover occurs and avoid the occurrence of Problems such as wrong window movement and packet loss.

way b:

In this embodiment of the present invention, if it is determined that an SN inversion occurs, it is determined that the SN value range that falls in the window corresponding to the RLC of the radio link control layer when the SN inversion occurs, including:

It is determined that the value range of the SN falling in the reassembly window corresponding to the UM RLC receiving entity when the SN rollover occurs is:

2 ^{sn-FieldLength} -(UM_Window_Size-RX_Next_Highest)≤SN < 2 ^{sn-FieldLength} , or,

0≤SN<RX_Next_Highest,

Among them, sn-FieldLength is the field length of SN.

The UM RLC receiving entity performs different settings on the value range of the SN falling in the reassembly window corresponding to the UM RLC receiving entity when the SN inversion occurs and when the SN inversion does not occur.

When no SN rollover occurs, the value range of the SN falling in the reassembly window corresponding to the UM RLC receiving entity is:

RX_Next_Highest-UM_Window_Size≤SN<RX_Next_Highest;

When an SN rollover occurs, the value range of the SN falling in the reassembly window corresponding to the UM RLC receiving entity is:

2 ^{sn-FieldLength} -(UM_Window_Size-RX_Next_Highest)≤SN < 2 ^{sn-FieldLength} , or,

0≤SN<RX_Next_Highest.

The value range of the SN falling in the reassembly window corresponding to the UM RLC receiving entity is set differently when the SN rollover occurs and when the SN rollover does not occur in the UM RLC receiving entity, so that the SN rollover can be maintained when the SN rollover occurs. The size of the window to avoid errors such as window movement and packet loss.

The second: for the sender of the AM RLC entity

In this embodiment of the present invention, according to the SN, judging whether an SN rollover occurs, including:

According to the SN, determine the second window state variable TX_Next_Ack corresponding to the transmitting end of the AM RLC entity, and the sending window size AM_Window_Size corresponding to the transmitting end of the AM RLC entity;

Determine whether the second window state variable TX_Next_Ack satisfies the following conditions:

TX_Next_Ack+AM_Window_Size>2 ^{[sn-FieldLength]} -1,

Wherein, sn-FieldLength is the field length of the SN;

If so, it is determined that an SN rollover has occurred.

After receiving the RLC PDU, the transmitter of the AM RLC entity determines the sequence number SN included in the RLC PDU. For example, after receiving the RLC PDU including the sequence number SN=2, the transmitter of the AM RL entity determines SN=2.

In practical applications, the sending end of the AM RLC entity maintains a sending window whose size is AM_Window_Size based on the second window state variable TX_Next_Ack.

Among them, the value of the second window state variable TX_Next_Ack is related to the field length sn-FieldLength of SN and SN, TX_Next_Ack=(SN+1)modulo(2 ^{sn-FieldLength} ); the sending window size occupies half of the SN space, AM_Window_Size=2 ^{(sn-FieldLength)-1} .

For example, SN=2048 is determined according to the received RLC PDU, and the field length of the SN is sn-FieldLength=12 bits.

The second window state variable TX_Next_Ack is:

TX_Next_Ack=(2048+1)module(2 ¹² )=2049;

The sending window size AM_Window_Size is:

AM_Window_Size=2 ^12-1 =2048.

At this time, TX_Next_Ack+AM_Window_Size=2049+2048=4097, 2 ^{[sn-FieldLength]} -1=4095, at this time, TX_Next_Ack+AM_Window_Size>2 ^{[sn-FieldLength]} -1, it is determined that the sender of the AM RLC entity is transmitting SN rollover occurs during RLC PDU.

When the sender of the AM RLC entity has an SN rollover when transmitting an RLC PDU, the methods for determining the SN value range that falls within the sending window corresponding to the sender of the AM RLC entity when the SN rollover occurs include but are not limited to the following two:

way a:

In this embodiment of the present invention, if it is determined that an SN inversion occurs, it is determined that the SN value range that falls in the window corresponding to the RLC of the radio link control layer when the SN inversion occurs, including:

Update the second inversion indicator variable flag_am_t corresponding to the transmitting end of the AM RLC entity, obtain the updated second inversion indicator variable flag_am_t, wherein the second inversion indicator variable flag_am_t is used to indicate the number of times that SN inversion occurs;

According to the updated second inversion indicator variable flag_am_t, it is determined that the value range of the SN falling in the transmission window corresponding to the transmitting end of the AM RLC entity when the SN inversion occurs is:

where i=[0, flag_am_t].

The sending end of the AM RLC entity is set to maintain a sending window together through the second window state variable TX_Next_Ack and the second rollover indicator variable flag_am_t. The value range of the SN falling in the sending window corresponding to the sending end of the AM RLC entity is:

Wherein, the initial value of the second inversion indicator variable flag_am_t is 0.

After the sender of the AM RLC entity starts to transmit the RLC PDU, if there is no SN rollover, that is, if TX_Next_Ack+AM_Window_Size≤2 ^{[sn-FieldLength]} -1, the second rollover indicator variable flag_am_t maintains the initial value of 0 unchanged. The value range of the SN falling in the reassembly window corresponding to the sender of the AM RLC entity is:

TX_Next_Ack≤SN＜TX_Next_Ack+AM_Window_Size;

When the SN rollover occurs for the first time in the transmission of the RLC PDU by the sender of the AM RLC entity, that is, when TX_Next_Ack+AM_Window_Size>2 ^{[sn-FieldLength]} -1 occurs for the first time, the second rollover indicator variable flag_am_t is updated. Suppose the step size, for example, increase the step size by 1 to obtain the updated second flip indicator variable flag_am_t=1, then the value range of the SN in the sending window corresponding to the sending end of the AM RLC entity is:

TX_Next_Ack≤SN+i*2 ^{[sn-FieldLength]} <TX_Next_Ack+AM_Window_Size,

Among them, i=[0,1];

When the sending end of the AM RLC entity transmits an RLC PDU with an SN rollover for the second time, that is, when TX_Next_Ack+AM_Window_Size>2 ^{[sn-FieldLength]} -1 occurs for the second time, the second rollover indicator variable flag_am_t is updated again, specifically adding The preset step size, for example, increases the step size by 1 to obtain the updated first flip indicator variable flag_am_t=2, then the value range of the SN in the sending window corresponding to the sending end of the AM RLC entity is:

Among them, i=[0,2];

By analogy, with the increase of the number of SN rollovers, the value range of the SN falling in the sending window corresponding to the sending end of the AM RLC entity is continuously adjusted, so as to maintain a fixed size window when the SN rollover occurs. Avoid problems such as retransmission and delay.

way b:

In this embodiment of the present invention, if it is determined that an SN inversion occurs, it is determined that the SN value range that falls in the window corresponding to the RLC of the radio link control layer when the SN inversion occurs, including:

If it is determined that an SN rollover occurs, it is determined that the SN value range that falls in the sending window corresponding to the sender of the AM RLC entity when the SN rollover occurs is:

TX_Next_Ack≤SN<2 ^{[sn-FieldLength]} , or,

0≤SN<2 ^{[sn-FieldLength]} -TX_Next_Ack.

The sending end of the AM RLC entity sets different value ranges of the SNs in the sending window corresponding to the sending end of the AM RLC entity when the SN inversion occurs and when the SN inversion does not occur.

When no SN rollover occurs, the value range of the SN falling in the sending window corresponding to the sending end of the AM RLC entity is:

TX_Next_Ack≤SN＜TX_Next_Ack+AM_Window_Size;

When the SN rollover occurs, the value range of the SN falling in the sending window corresponding to the sending end of the AM RLC entity is:

TX_Next_Ack≤SN<2 ^{[sn-FieldLength]} , or,

0≤SN<2 ^{[sn-FieldLength]} -TX_Next_Ack.

By setting the value range of the SN in the sending window corresponding to the sending end of the AM RLC entity when the SN inversion occurs and when the SN inversion does not occur at the transmitting end of the AM RLC entity, different settings are performed, so as to realize the SN inversion when the SN inversion occurs. It can maintain a fixed size window to avoid problems such as retransmission and delay.

The third type: for the receiver of the AM RLC entity

In this embodiment of the present invention, according to the SN, judging whether an SN rollover occurs, including:

According to the SN, determine the third window state variable RX_Next corresponding to the receiving end of the AM RLC entity, and the receiving window size AM_Window_Size corresponding to the receiving end of the AM RLC entity;

Determine whether the third window state variable RX_Next satisfies the following conditions:

RX_Next+AM_Window_Size>2 ^{[sn-FieldLength]} -1,

Wherein, sn-FieldLength is the field length of the SN;

If so, it is determined that an SN rollover has occurred.

After receiving the RLC PDU, the receiver of the AM RLC entity determines the sequence number SN included in the RLC PDU. For example, after receiving the RLC PDU including the sequence number SN=2, the receiving end of the AM RL entity determines SN=2.

In practical applications, the receiving end of the AM RLC entity maintains a receiving window with a receiving window size of AM_Window_Size based on the third window state variable RX_Next.

Among them, the value of the third window state variable RX_Next is related to the field length sn-FieldLength of SN and SN, RX_Next=(SN+1)modulo(2 ^{sn-FieldLength} ); the receiving window size occupies half of the SN space, AM_Window_Size=2 ^{(sn-FieldLength)-1} .

For example, SN=2048 is determined according to the received RLC PDU, and the field length of the SN is sn-FieldLength=12 bits.

The third window state variable RX_Next is:

RX_Next=(2048+1)module(2 ¹² )=2049;

The receiving window size AM_Window_Size is:

AM_Window_Size=2 ^12-1 =2048.

At this time, RX_Next+AM_Window_Size=2049+2048=4097, 2 ^{[sn-FieldLength]} -1=4095, at this time, RX_Next+AM_Window_Size>2 ^{[sn-FieldLength]} -1, it is determined that the receiving end of the AM RLC entity is transmitting SN rollover occurs during RLCPDU.

When the receiving end of the AM RLC entity has an SN rollover when transmitting an RLC PDU, the methods for determining the SN value range that falls within the receiving window corresponding to the receiving end of the AM RLC entity when the SN rollover occurs include but are not limited to the following two:

way a:

In this embodiment of the present invention, if it is determined that an SN inversion occurs, it is determined that the SN value range that falls in the window corresponding to the RLC of the radio link control layer when the SN inversion occurs, including:

Update the third inversion indicator variable flag_am_r corresponding to the receiving end of the AM RLC entity, obtain the updated third inversion indicator variable flag_am_r, wherein the second inversion indicator variable flag_am_r is used to indicate the number of times that SN inversion occurs;

According to the updated third inversion indicator variable flag_am_r, it is determined that the range of SN values falling in the receiving window corresponding to the receiving end of the AM RLC entity when the SN inversion occurs is:

where i=[0, flag_am_r].

The receiving end of the AM RLC entity is set to maintain a receiving window together through the third window state variable RX_Next and the third rollover indicator variable flag_am_r. The value range of the SN falling in the receiving window corresponding to the receiving end of the AM RLC entity is:

Wherein, the initial value of the third inversion indicator variable flag_am_r is 0.

After the receiving end of the AM RLC entity starts to transmit the RLC PDU, if no SN rollover occurs, that is, if RX_Next+AM_Window_Size≤2 ^{[sn-FieldLength]} -1, the third rollover indicator variable flag_am_r maintains the initial value of 0 unchanged. The value range of the SN falling in the receiving window corresponding to the receiving end of the AM RLC entity is:

RX_Next≤SN＜RX_Next+AM_Window_Size;

When the SN rollover occurs for the first time when the receiver of the AM RLC entity transmits the RLC PDU, that is, when RX_Next+AM_Window_Size>2 ^{[sn-FieldLength]} -1 occurs for the first time, the third rollover indicator variable flag_am_r is updated, specifically to increase the Suppose the step size, for example, increase the step size by 1 to obtain the updated third flip indicator variable flag_am_r=1, then the value range of the SN in the receiving window corresponding to the receiving end of the AMRLC entity is:

RX_Next≤SN+i*2 ^{[sn-FieldLength]} <RX_Next+AM_Window_Size,

Among them, i=[0,1];

When the receiving end of the AM RLC entity transmits the RLC PDU when the SN rollover occurs for the second time, that is, when RX_Next+AM_Window_Size>2 ^{[sn-FieldLength]} -1 occurs for the second time, the third rollover indicator variable flag_am_r is updated again, specifically to increase The preset step size, for example, increases the step size by 1 to obtain the updated first flip indicator variable flag_am_r=2, then the value range of the SN in the receiving window corresponding to the receiving end of the AM RLC entity is:

Among them, i=[0,2];

By analogy, with the increase of the number of SN rollovers, the value range of the SN falling in the receiving window corresponding to the receiving end of the AM RLC entity is continuously adjusted, so as to maintain a fixed size window when the SN rollover occurs. Avoid problems such as retransmission and delay.

way b:

In this embodiment of the present invention, if it is determined that an SN inversion occurs, it is determined that the SN value range that falls in the window corresponding to the RLC of the radio link control layer when the SN inversion occurs, including:

If it is determined that an SN rollover occurs, it is determined that the SN value range that falls in the receiving window corresponding to the receiving end of the AM RLC entity when the SN rollover occurs is:

RX_Next≤SN<2 ^{[sn-FieldLength]} , or,

0≤SN<2 ^{[sn-FieldLength]} -RX_Next.

The receiving end of the AM RLC entity sets different value ranges of the SNs in the receiving window corresponding to the receiving end of the AM RLC entity when the SN inversion occurs and when the SN inversion does not occur.

When the SN rollover does not occur, the value range of the SN falling in the receiving window corresponding to the receiving end of the AM RLC entity is:

RX_Next≤SN＜RX_Next+AM_Window_Size;

When the SN rollover occurs, the value range of the SN falling in the receiving window corresponding to the receiving end of the AM RLC entity is:

RX_Next≤SN<2 ^{[sn-FieldLength]} , or,

0≤SN<2 ^{[sn-FieldLength]} -RX_Next.

The value range of the SN falling in the receiving window corresponding to the receiving end of the AM RLC entity is set differently when the SN inversion occurs at the receiving end of the AM RLC entity and when the SN inversion does not occur, so as to realize the SN inversion when the SN inversion occurs. It can maintain a fixed size window to avoid problems such as retransmission and delay.

According to the technical solution described in the embodiment of the present invention, by receiving a radio link control layer protocol data unit RLC PDU including a sequence number SN, it is further determined whether an SN inversion occurs according to the SN, and when it is determined that an SN inversion occurs, it is determined that a SN inversion occurs when an SN inversion occurs. The range of SN values that fall in the window corresponding to the RLC of the radio link control layer, so that the RLC can maintain a fixed size window when the SN rollover occurs, avoiding problems such as retransmission, delay, and packet loss in data transmission.

FIG. 2 is a schematic structural diagram of an apparatus for determining a radio link control layer window according to an embodiment of the present invention. Apparatus 200 includes:

a receiving module 201, configured to receive a radio link control layer protocol data unit RLC PDU, wherein the RLC PDU includes a sequence number SN;

The judgment module 202 is used for judging whether the SN flip occurs according to the SN;

The determining module 203 is configured to, when it is determined that the SN inversion occurs, determine the SN value range that falls within the window corresponding to the RLC of the radio link control layer when the SN inversion occurs.

Optionally, when the apparatus 200 is applied to an unacknowledged mode UM RLC receiving entity, and the reassembly window corresponding to the UM RLC receiving entity reaches stability;

The judging module 202 further includes:

a first determination unit, configured to determine, according to the SN, the first window state variable RX_Next_Highest corresponding to the UM RLC receiving entity, and the reassembly window size UM_Window_Size corresponding to the UM RLC receiving entity;

The first judgment unit is used to judge whether the first window state variable RX_Next_Highest satisfies the following conditions:

RX_Next_Highest-UM_Window_Size<0;

The first determining unit is further configured to determine that an SN inversion occurs when RX_Next_Highest-UM_Window_Size<0.

Optionally, the determining module 203 further includes:

The first update unit is used to update the first inversion indicator variable flag_um corresponding to the UM RLC receiving entity, and obtain the updated first inversion indicator variable flag_um, wherein the first inversion indicator variable flag_um is used to indicate the number of times that SN inversion occurs;

The third determination unit, according to the updated first reversal indicator variable flag_um, determines that the SN value range that falls in the reorganization window corresponding to the UM RLC receiving entity when the SN reversal occurs is:

Wherein, i=[0, flag_um], and sn-FieldLength is the field length of SN.

Optionally, the determining module 203 is specifically configured to:

If it is determined that an SN rollover occurs, it is determined that the SN value range that falls in the reassembly window corresponding to the UM RLC receiving entity when the SN rollover occurs is:

2 ^{sn-FieldLength} -(UM_Window_Size-RX_Next_Highest)≤SN < 2 ^{sn-FieldLength} , or,

0≤SN<RX_Next_Highest,

Wherein, sn-FieldLength is the field length of the SN.

Optionally, the apparatus 200 is applied to the sender of the acknowledgment mode AM RLC entity;

The judging module 202 further includes:

The fourth determination unit is used to determine, according to the SN, the second window state variable TX_Next_Ack corresponding to the transmitting end of the AM RLC entity, and the sending window size AM_Window_Size corresponding to the transmitting end of the AM RLC entity;

The second judgment unit is used to judge whether the second window state variable TX_Next_Ack satisfies the following conditions:

TX_Next_Ack+AM_Window_Size>2 ^{[sn-FieldLength]} -1,

Among them, sn-FieldLength is the field length of SN;

The fifth determination unit is configured to determine that SN inversion occurs when TX_Next_Ack+AM_Window_Size>2 ^{[sn-FieldLength]} -1.

Optionally, the determining module 203 further includes:

The second update unit is used to update the second inversion indicator variable flag_am_t corresponding to the transmitting end of the AM RLC entity, and obtain the updated second inversion indicator variable flag_am_t, wherein the second inversion indicator variable flag_am_t is used to indicate the number of times that SN inversion occurs ;

The sixth determination unit is used to determine, according to the updated second inversion indicator variable flag_am_t, that the SN value range that falls in the transmission window corresponding to the transmission end of the AM RLC entity when the SN inversion occurs is:

where i=[0, flag_am_t].

Optionally, the determination module is specifically used to:

If it is determined that an SN rollover occurs, it is determined that the SN value range that falls in the sending window corresponding to the sender of the AM RLC entity when the SN rollover occurs is:

TX_Next_Ack≤SN<2 ^{[sn-FieldLength]} , or,

0≤SN<2 ^{[sn-FieldLength]} -TX_Next_Ack.

Optionally, the apparatus 200 is applied to the receiving end of the acknowledgment mode AM RLC entity;

The judging module 202 further includes:

The seventh determination unit is used to determine, according to the SN, the third window state variable RX_Next corresponding to the receiving end of the AM RLC entity, and the receiving window size AM_Window_Size corresponding to the receiving end of the AM RLC entity;

The third judgment unit is used to judge whether the third window state variable RX_Next satisfies the following conditions;

RX_Next+AM_Window_Size>2 ^{[sn-FieldLength]} -1,

Among them, sn-FieldLength is the field length of SN;

The eighth determination unit is configured to determine that an SN inversion occurs when RX_Next+AM_Window_Size>2 ^{[sn-FieldLength]} -1.

Optionally, the determining module 203 further includes:

The third update unit is used to update the third inversion indicator variable flag_am_r corresponding to the receiving end of the AM RLC entity, and obtain the updated third inversion indicator variable flag_am_r, wherein the second inversion indicator variable flag_am_r is used to indicate the number of times that SN inversion occurs ;

The ninth determination unit is used to determine, according to the updated third inversion indicator variable flag_am_r, that the SN value range that falls in the receiving window corresponding to the receiving end of the AM RLC entity when the SN is inverted is:

where i=[0, flag_am_r].

Optionally, the determining module 203 is specifically configured to:

If it is determined that an SN rollover occurs, it is determined that the SN value range that falls in the receiving window corresponding to the receiving end of the AM RLC entity when the SN rollover occurs is:

RX_Next≤SN<2 ^{[sn-FieldLength]} , or,

0≤SN<2 ^{[sn-FieldLength]} -RX_Next.

In this embodiment of the present invention, the communication device may include: a network device and a terminal device. When the communication device is a network device, as shown in FIG. 3 , FIG. 3 is a schematic structural diagram of a network device provided in an embodiment of the present invention. A schematic structural diagram of a physical device may be shown in FIG. 3 , including a processor 302 , a memory 303 , a transmitter 301 and a receiver 304 . In particular applications, transmitter 301 and receiver 304 may be coupled to antenna 305 .

The memory 303 is used to store programs. Specifically, the program may include program code, and the program code includes computer operation instructions. Memory 303 may include read-only memory and random access memory, and provides instructions and data to processor 302 . The memory 303 may include high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.

The processor 302 executes the program stored in the memory 303 .

Specifically, in the network device 300, the processor 302 can perform the following methods:

receiving a radio link control layer protocol data unit RLC PDU, wherein the RLC PDU includes a sequence number SN;

According to SN, determine whether SN flip occurs;

If it is determined that the SN inversion occurs, it is determined that the SN value range falls within the window corresponding to the RLC of the radio link control layer when the SN inversion occurs.

The foregoing method performed by the network device 300 disclosed in the embodiment shown in FIG. 1 of the present invention may be applied to the processor 302 or implemented by the processor 302 . The processor 302 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method can be completed by an integrated logic circuit of hardware in the processor 302 or an instruction in the form of software. The above-mentioned processor 302 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC). ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory 303, and the processor 302 reads the information in the memory 303, and completes the steps of the above method in combination with its hardware.

The network device may also execute the method shown in FIG. 1 , and implement the functions of the network device in the embodiment shown in FIG. 1 , and details are not described herein again in this embodiment of the present invention.

When the communication device is a terminal device, as shown in FIG. 4 , which is a schematic structural diagram of a terminal device provided by an embodiment of the present invention, the terminal device 400 shown in FIG. 4 includes: at least one processor 401 , memory 402 , at least one Network interface 404 and user interface 403. The various components in terminal device 400 are coupled together by bus system 405 . It can be understood that the bus system 405 is used to implement the connection communication between these components. In addition to the data bus, the bus system 405 also includes a power bus, a control bus, and a status signal bus. However, for clarity of illustration, the various buses are labeled as bus system 405 in FIG. 4 .

The user interface 403 may include a display, a keyboard, or a pointing device (eg, a mouse, a trackball, a touch pad, or a touch screen), and the like.

It can be understood that the memory 402 in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be Read-Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (ErasablePROM, EPROM), Electrically Erasable Program read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be Random Access Memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double data rate synchronous dynamic random access memory (DoubleDataRateSDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (SynchlinkDRAM, SLDRAM) and direct memory bus random access Memory (DirectRambusRAM, DRRAM). The memory 402 of the systems and methods described in embodiments of the present invention is intended to include, but not be limited to, these and any other suitable types of memory.

In some embodiments, memory 402 stores the following elements, executable modules or data structures, or subsets thereof, or extended sets of them: operating system 4021 and applications 4022 .

The operating system 4021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application program 4022 includes various application programs, such as a media player (MediaPlayer), a browser (Browser), etc., for implementing various application services. A program for implementing the method of the embodiment of the present invention may be included in the application program 4022 .

In this embodiment of the present invention, the terminal device 400 further includes: a radio link control layer window determination program stored in the memory 402 and executable on the processor 401 , when the radio link control layer window determination program is executed by the processor 401 Implement the following steps:

receiving a radio link control layer protocol data unit RLC PDU, wherein the RLC PDU includes a sequence number SN;

According to SN, determine whether SN flip occurs;

If it is determined that the SN inversion occurs, it is determined that the SN value range falls within the window corresponding to the RLC of the radio link control layer when the SN inversion occurs.

The methods disclosed in the above embodiments of the present invention may be applied to the processor 401 or implemented by the processor 401 . The processor 401 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method can be completed by an integrated logic circuit of hardware in the processor 401 or an instruction in the form of software. The above-mentioned processor 401 may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (FieldProgrammableGateArray, FPGA) or other programmable logic devices, discrete gates. Or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other computer-readable storage media that are mature in the art. The computer-readable storage medium is located in the memory 402, and the processor 401 reads the information in the memory 402, and completes the steps of the above method in combination with its hardware. Specifically, the computer-readable storage medium stores a radio link control layer window determination program, and when the radio link control layer window determination program is executed by the processor 401, each of the radio link control layer window determination method embodiments described above is implemented. step.

It can be understood that the embodiments described in the embodiments of the present invention may be implemented by hardware, software, firmware, middleware, microcode or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (Application Specific Integrated Circuits, ASIC), digital signal processors (Digital Signal Processing, DSP), digital signal processing devices (DSP Device, DSPD), Programmable Logic Device (Programmable Logic Device, PLD) ), a Field-Programmable Gate Array (FPGA), a general-purpose processor, a controller, a microcontroller, a microprocessor, other electronic units for performing the functions described in the present invention, or a combination thereof.

For software implementation, the techniques described in the embodiments of the present invention may be implemented through modules (eg, procedures, functions, etc.) that perform the functions described in the embodiments of the present invention. Software codes may be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

The terminal device 400 can implement each process implemented by the terminal device in the foregoing embodiments, and in order to avoid repetition, details are not repeated here.

An embodiment of the present invention also provides a computer-readable storage medium, where the computer-readable storage medium stores one or more programs, and the one or more programs include instructions, and the instructions are executed by a communication device including multiple application programs. , the communication device can be made to perform the method of the embodiment shown in FIG. 1, and is specifically used to perform the following operations:

receiving a radio link control layer protocol data unit RLC PDU, wherein the RLC PDU includes a sequence number SN;

According to SN, determine whether SN flip occurs;

If it is determined that the SN inversion occurs, it is determined that the SN value range falls within the window corresponding to the RLC of the radio link control layer when the SN inversion occurs.

In a word, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

The systems, devices, modules or units described in the above embodiments may be specifically implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or A combination of any of these devices.

Computer-readable media includes both persistent and non-permanent, removable and non-removable media, and storage of information may be implemented by any method or technology. Information may be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash Memory or other memory technology, Compact Disc Read Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridges, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, excludes transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a series of elements includes not only those elements, but also Other elements not expressly listed or inherent to such a process, method, article of manufacture or apparatus are also included. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article of manufacture or device that includes the element.

Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, as for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for related parts, please refer to the partial descriptions of the method embodiments.

Claims (18)

1. A method for determining a radio link control layer window is characterized by comprising the following steps:

receiving a radio link control layer protocol data unit (RLC PDU), wherein the RLC PDU comprises a Serial Number (SN);

judging whether SN overturning occurs or not according to the SN;

if the SN is determined to be turned over, determining the SN value range falling into a window corresponding to a Radio Link Control (RLC) layer when the SN is turned over;

when a recombination window corresponding to an unacknowledged mode UM RLC receiving entity is stable, the recombination window is determined to be stable;

the judging whether SN overturn occurs according to the SN comprises the following steps:

determining a first Window state variable RX _ Next _ Highest corresponding to the UM RLC receiving entity and a recombination Window Size UM _ Window _ Size corresponding to the UM RLC receiving entity according to the SN;

judging whether the first window state variable RX _ Next _ Highest meets the following conditions:

RX_Next_Highest-UM_Window_Size＜0；

if so, determining that SN roll-over occurs;

correspondingly, if it is determined that SN rollover occurs, determining an SN value range falling in a window corresponding to the radio link control layer RLC when SN rollover occurs, including:

updating a first overturning indication variable flag _ UM corresponding to the UM RLC receiving entity to obtain the updated first overturning indication variable flag _ UM, wherein the first overturning indication variable flag _ UM is used for indicating the number of times of SN overturning;

according to the updated first overturn indication variable flag _ UM, determining that the value range of SN falling into a recombination window corresponding to an UM RLC receiving entity when the SN overturns is as follows:

wherein i ═ 0, flag _ um, SN-FieldLength is the domain length of the SN.

2. The method of claim 1, wherein if it is determined that SN rollover occurs, determining a value range of SN that falls within a window corresponding to a radio link control layer, RLC, when SN rollover occurs, comprises:

if the SN overturn is determined to occur, the value range of the SN falling into the recombination window corresponding to the UM RLC receiving entity when the SN overturn occurs is determined to be as follows:

2^{sn-FieldLength}-(UM_Window_Size-RX_Next_Highest)≤SN＜2^{sn-FieldLength}either, or,

0≤SN＜RX_Next_Highest，

wherein the SN-FieldLength is the domain length of the SN.

3. The method of claim 1, wherein the method is applied to a transmitting end of an acknowledged mode AM RLC entity;

the judging whether SN overturn occurs according to the SN comprises the following steps:

determining a second Window state variable TX _ Next _ Ack corresponding to the sending end of the AM RLC entity and a sending Window Size AM _ Window _ Size corresponding to the sending end of the AM RLC entity according to the SN;

judging whether the second window state variable TX _ Next _ Ack meets the following conditions:

TX_Next_Ack+AM_Window_Size＞2^{[sn-FieldLength]}-1，

wherein SN-FieldLength is the domain length of the SN;

and if so, determining that SN inversion occurs.

4. The method of claim 3, wherein if it is determined that SN rollover occurs, determining a value range of SNs that fall within a window corresponding to a Radio Link Control (RLC) layer when SN rollover occurs comprises:

updating a second overturning indication variable flag _ AM _ t corresponding to a sending end of the AM RLC entity to obtain an updated second overturning indication variable flag _ AM _ t, wherein the second overturning indication variable flag _ AM _ t is used for indicating the number of times of SN overturning;

and according to the updated second overturn indication variable flag _ AM _ t, determining that the SN value range falling into a sending window corresponding to the sending end of the AM RLC entity when the SN overturn occurs is as follows:

where, i ═ 0, flag _ am _ t.

5. The method of claim 3, wherein if it is determined that SN rollover occurs, determining a value range of SNs that fall within a window corresponding to a Radio Link Control (RLC) layer when SN rollover occurs comprises:

if the SN roll-over is determined to occur, determining that the SN value range falling into a sending window corresponding to a sending end of the AM RLC entity when the SN roll-over occurs is as follows:

TX_Next_Ack≤SN＜2^{[sn-FieldLength]}either, or,

0≤SN＜2^{[sn-FieldLength]}-TX_Next_Ack。

6. the method of claim 1, wherein the method is applied to a receiving end of an acknowledged mode AM RLC entity;

the judging whether SN overturn occurs according to the SN comprises the following steps:

determining a third Window state variable RX _ Next corresponding to a receiving end of the AM RLC entity and a receiving Window Size AM _ Window _ Size corresponding to the receiving end of the AM RLC entity according to the SN;

judging whether the third window state variable RX _ Next satisfies the following conditions:

RX_Next+AM_Window_Size＞2^{[sn-FieldLength]}-1，

wherein SN-FieldLength is the domain length of the SN;

and if so, determining that SN inversion occurs.

7. The method of claim 6, wherein if it is determined that SN rollover occurs, determining a value range of SNs that fall within a window corresponding to a Radio Link Control (RLC) layer when SN rollover occurs comprises:

updating a third overturning indication variable flag _ AM _ r corresponding to a receiving end of the AM RLC entity to obtain an updated third overturning indication variable flag _ AM _ r, wherein the second overturning indication variable flag _ AM _ r is used for indicating the number of times of SN overturning;

according to the updated third overturn indication variable flag _ AM _ r, determining that the SN value range falling into a receiving window corresponding to the receiving end of the AM RLC entity when the SN overturn occurs is as follows:

where, i ═ 0, flag _ am _ r.

8. The method of claim 6, wherein if it is determined that SN rollover occurs, determining a value range of SNs that fall within a window corresponding to a Radio Link Control (RLC) layer when SN rollover occurs comprises:

if the SN overturn is determined to occur, determining that the SN value range falling into a receiving window corresponding to a receiving end of the AM RLC entity when the SN overturn occurs is as follows:

RX_Next≤SN＜2^{[sn-FieldLength]}either, or,

0≤SN＜2^{[sn-FieldLength]}-RX_Next。

9. an apparatus for determining a radio link control layer window, comprising:

the receiving module is used for receiving a radio link control layer protocol data unit (RLC PDU), wherein the RLC PDU comprises a Serial Number (SN);

the judging module is used for judging whether SN overturn occurs or not according to the SN;

the determining module is used for determining the SN value range falling into a window corresponding to the Radio Link Control (RLC) layer when the SN overturn is determined to occur;

when a recombination window corresponding to an unacknowledged mode UM RLC receiving entity is stable, the recombination window is determined to be stable;

the judging module further comprises:

a first determining unit, configured to determine, according to the SN, a first Window state variable RX _ Next _ high corresponding to the UM RLC receiving entity and a reassembly Window Size UM _ Window _ Size corresponding to the UM RLC receiving entity;

a first judging unit, configured to judge whether the first window state variable RX _ Next _ Highest satisfies the following condition:

RX_Next_Highest-UM_Window_Size＜0；

the second determination unit is further used for determining that SN inversion occurs when RX _ Next _ Highest-UM _ Window _ Size is less than 0;

accordingly, the determining module further comprises:

the device comprises a first updating unit, a second updating unit and a processing unit, wherein the first updating unit is used for updating a first overturning indication variable flag _ UM corresponding to the UM RLC receiving entity to obtain the updated first overturning indication variable flag _ UM, and the first overturning indication variable flag _ UM is used for indicating the number of times of SN overturning;

and a third determining unit, configured to determine, according to the updated first roll-over indication variable flag _ UM, that the value range of the SN falling into the reassembly window corresponding to the UM RLC receiving entity when the SN roll-over occurs is:

wherein i ═ 0, flag _ um, SN-FieldLength is the domain length of the SN.

10. The apparatus of claim 9, wherein the determination module is specifically configured to:

if the SN overturn is determined to occur, the value range of the SN falling into the recombination window corresponding to the UM RLC receiving entity when the SN overturn occurs is determined to be as follows:

2^{sn-FieldLength}-(UM_Window_Size-RX_Next_Highest)≤SN＜2^{sn-FieldLength}either, or,

0≤SN＜RX_Next_Highest，

wherein the SN-FieldLength is the domain length of the SN.

11. The apparatus of claim 9, wherein the apparatus is applied to a transmitting end of an acknowledged mode, AM, RLC entity;

the judging module further comprises:

a fourth determining unit, configured to determine, according to the SN, a second Window state variable TX _ Next _ Ack corresponding to the sending end of the AM RLC entity, and a sending Window Size AM _ Window _ Size corresponding to the sending end of the AM RLC entity;

a second judging unit, configured to judge whether the second window state variable TX _ Next _ Ack satisfies the following condition:

TX_Next_Ack+AM_Window_Size＞2^{[sn-FieldLength]}-1，

wherein SN-FieldLength is the domain length of the SN;

a fifth determination unit for determining whether TX _ Next _ Ack + AM _ Window _ Size > 2^{[sn-FieldLength]}At-1, it is determined that SN roll-over occurred.

12. The apparatus of claim 11, wherein the determining module further comprises:

the second updating unit is used for updating a second overturning indication variable flag _ AM _ t corresponding to the sending end of the AM RLC entity to obtain an updated second overturning indication variable flag _ AM _ t, wherein the second overturning indication variable flag _ AM _ t is used for indicating the number of times of SN overturning;

a sixth determining unit, configured to determine, according to the updated second roll-over indication variable flag _ AM _ t, that a value range of an SN falling in a sending window corresponding to a sending end of the AM RLC entity when the SN roll-over occurs is:

where, i ═ 0, flag _ am _ t.

13. The apparatus of claim 11, wherein the determination module is specifically configured to:

if the SN roll-over is determined to occur, determining that the SN value range falling into a sending window corresponding to a sending end of the AM RLC entity when the SN roll-over occurs is as follows:

TX_Next_Ack≤SN＜2^{[sn-FieldLength]}either, or,

0≤SN＜2^{[sn-FieldLength]}-TX_Next_Ack。

14. the apparatus of claim 9, wherein the apparatus is applied to a receiving end of an acknowledged mode, AM, RLC entity;

the judging module further comprises:

a seventh determining unit, configured to determine, according to the SN, a third Window state variable RX _ Next corresponding to a receiving end of the AM RLC entity and a Size AM _ Window _ Size corresponding to the receiving end of the AM RLC entity;

a third judging unit, configured to judge whether the third window state variable RX _ Next satisfies the following condition:

RX_Next+AM_Window_Size＞2^{[sn-FieldLength]}-1，

wherein SN-FieldLength is the domain length of the SN;

an eighth determining unit for determining whether RX _ Next + AM _ Window _ Size > 2^{[sn-FieldLength]}At-1, it is determined that SN roll-over occurred.

15. The apparatus of claim 14, wherein the determining module further comprises:

a third updating unit, configured to update a third roll-over indication variable flag _ AM _ r corresponding to a receiving end of the AM RLC entity to obtain an updated third roll-over indication variable flag _ AM _ r, where the second roll-over indication variable flag _ AM _ r is used to indicate the number of times of SN roll-over;

a ninth determining unit, configured to determine, according to the updated third flipping indication variable flag _ AM _ r, that a value range of an SN falling into a receiving window corresponding to a receiving end of the AM RLC entity when the SN flipping occurs is:

where, i ═ 0, flag _ am _ r.

16. The apparatus of claim 14, wherein the determination module is specifically configured to:

if the SN overturn is determined to occur, determining that the SN value range falling into a receiving window corresponding to a receiving end of the AM RLC entity when the SN overturn occurs is as follows:

RX_Next≤SN＜2^{[sn-FieldLength]}either, or,

0≤SN＜2^{[sn-FieldLength]}-RX_Next。

17. an apparatus for determining a radio link control layer window, comprising: memory, processor and radio link control layer window determination program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method according to any of claims 1 to 8.

18. A computer-readable storage medium, having stored thereon a radio link control layer window determination program which, when executed by a processor, implements the steps of the method according to any one of claims 1 to 8.

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