TWI231104B - Enhanced SDU discard signaling procedure in wireless communication systems - Google Patents

Abstract

This invention of a modified MRW procedure eliminates any other SN_MRWi fields in the MRW SUFI that have the same value as the SN_MRWLENGTH field has. Therefore, the size of the MRW SUFI can be shortened and separated MWR procedures can be eliminated in some cases. In addition, the SDUs completely contained in the first transmitted AMD PDU after the termination of the MRW procedure can be processed as correctly received SDUs by the receiver so that the transmitted data octets over the air are fully utilized to improve the overall system efficiency.

Description

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V. Description of the invention (1) The technical field to which the invention belongs The present invention relates to a wireless communication technology 'and, in particular, to a method for efficiently discarding a service data unit in an acknowledgement mode. In the prior art in acknowledged mode, when the sender discards the service date unit (hereinafter referred to as SDU) because it exceeds the time out or exceeds the maximum number of transmissions, it will The message of discarding the SDU is notified to the corresponding receiver, so that the receiver can discard the acknowledged mode data protocol data unit (hereinafter referred to as AMD PDU) containing the above SDU data content, and According to its recei v ing window. The sender will use a status protocol data unit (hereinafter referred to as a status PDU) 'which includes a mobile receive window composite field (μ 0 ve Receiving Window super-field (hereinafter referred to as MRW SUFI) to request The receiver moves its reception window and selectively indicates a radio link control layer SDU (hereinafter referred to as RLCSDU) that should be discarded. This S D U discarding procedure is called an explicit signaling SDU discarding procedure, or simply a Move Receiving Window (hereinafter referred to as MRW) procedure. Figure 1 is a schematic diagram showing a general mobile reception window compound stop (MRW SUFI) 2. The 'Type' block 4 indicates the type of this compound field. The length (LENGTH) field 6 includes 4 bits, and the values " 〇〇〇1 " to " 1111 " indicate that there will be 1 to 15 SN_MRWi fields, respectively.

0660-A40181twf (nl); 92020; FRANKLIN.ptd Page 5 1231104 V. Description of the invention (2) π 〇〇〇〇〇π represents a SN — MRWi field, and indicates that in the transmitter, the RLC is discarded The SDU has exceeded its configured transmission window. Second, each of the SN_MRWi fields 8 to 14 is 12 bits. When the configuration is set to n Send MRW ", it means that the transmitter must have a SNJRWi block corresponding to the end of a discarded RLC SDU, that is, the SN_MRWi field The number will be the same as the number of RLC SDUs discarded through this MRW SUFI. When the configuration is not set to "Send MRWn", the transmitter will use a siMRWi field to indicate the end of the last RLC SDU to be discarded in the receiver, and optionally use an additional SN_MRWi field to indicate other discarded RLC SDU ends.

The sequence number of the AMD PDU (SN) is filled in the SN-MRWi. The AMD PDU contains the π length indicator field of the first RLC SDU to be discarded by the receiver. (When N_τη is 0, the value of S N —MR WLENGTH is otherwise specified, which will be described later.). These SN_MRWi fields must be in the same order as the RLC SDUs they refer to. In addition, the sender will use SN_MRWLENGTH to require the receiver to discard all A M D P D U with serial numbers less than other_MRW ^ _, and move the receiving window accordingly.

Finally, the Nlength field 16 is 4 bits long. The transmitter uses Nlength and S N —MR WLENGTH to indicate the end of the last RLC SDU that was dropped in the receiving end. Nlength indicates the Nlengthth of the AMD PDU with the serial number SN — MRWlength, and the f length indication field corresponds to the last RLC SDU in the receiving end that should be discarded. When the hidden value is 0, it means that the last serial number of the last RLC SDU in the AMD PDU is SN_MRWlength -i and the first octet (data ocets) of the AMD PDU with the serial number SN is the subsequent reassembly data. ) The first data octet.

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The figure shows the basic flow chart of the explicit signaling SDU discarding procedure. When = Subscribe-MRW procedure, the sender transmits-state pM, which includes-mobile receiving window compound stop (MRW SUFI). According to the received _SUFI, the receiver will return a status pDU to the transmitter, which includes a corresponding mobile receive window response composite field (MRWjCK SUFI). When the sender. After receiving the MRWjCK SUFI transmitted by the receiver, the procedure X ends. ^ When the fruit transmitter detects one of the following triggering events, it will start a dilemma. Procedure: (1) A group of timer-based SDU discard procedures explicit signalmg) ", 1Timer of a certain SDU — Discard some paragraphs of the SDU that have expired and were discarded have been passed to the next layer, (2) configured to be "except for timer-based display" "SDU discarding procedure", the timing of a certain SDU gTimer —Discard timeout and the configuration is set to nSend MRWn; or

• (3) The group is "SDU discard after MaxDAT number of transmissions", and for an AMD PDU, the maximum number of transmissions has been reached (VT (DAT) — M a XDA D).

In other words, if the configuration is “I, the timer is based on the SDU discarding procedure based on external signaling”, for each SDU received from the upper layer, the transmitter will start a timer Timer—Di scard. When the time r_discard of an SDU expires, the transmitter will discard the SDU. In addition, when the SDU is discarded, 'if the configuration is set to "Send MRW, or it is discarded 31) 11

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1231104 V. Description of the invention (4) At least one paragraph was passed to an MRW program. When the / At layer is relatively secretive, Fada will start an SDU discarding process. "/ Sadness " The maximum value after transmitting the maximum number of transmissions is two slaves, although the number of transmissions of an AMD PDU reaches MaxDAT (up to όίι ^ ϊί 人, #upper limit), the sender will discard all MRW procedures that are covered in the AMD PDU, and start executing a MRW process. · Pidi, the field starts the MRW process because the timer Timer-Discard timeout The second device will discard all SDUs whose timer-Discard timeout has expired. This is the maximum limit of the number of M ^ 1 transmissions due to a certain AMD (ie VT (DAT)-MaXDAT) During the boot sequence, the sender will discard all SDUs covered by AMD PDUs in the range of VT (A) $ SN SX, where X is to satisfy vt (DAT)-

Sequence number of AMD PDU under Max ^ AT condition. VT (A) is the serial number of the first in-sequence AMD PDU whose receipt has not been confirmed. Once the MRW process starts, the transmitter starts the timer Timer-MRW. However, only one timer Timer-MRW can be executed at the same time, so if a newly triggered MRW procedure occurs when the timer τ imer_MRw has been started, no new MRW SUFI will be transmitted until the current MRW procedure is terminated. The termination condition of the MRW program is when the transmitter receives a status PDU or Piggybacked status PDU from the receiver, which includes a mobile receive window in response to a composite stop (MRW_ACK SUFI). — When the MRW procedure is terminated, the transmitter will stop executing Timer-MRW, and update VT (A) and VT (MS) according to the received status PDU or entrained status PDU '. Even so, the transmitter must not be up

1231104 V. Description of Invention (5) The layer confirms that the SDUs required to be discarded have indeed been discarded by the receiving end. Figure 3 shows the detailed logic flow chart for setting up a MRW SUFI in the MRW program. When an MRW procedure is triggered (step S100), a status PDU with MRW SUFI is started (step S102). Next, check whether the configuration is n Send MRWn (step S1 04), and if it is determined, further check whether the number of discarded SDUs exceeds 15 (step S1 10). If there are more than 15, an MRW SUFI is established for the first 15 SDUs, where an SN-MRWi field corresponds to a dropped SDU (steps S112 and S114). The transmitter will leave the remaining discarded SDUs to the next MRW procedure. On the other hand, if the configuration is not set to " Send MRWn, the last SN_MRWi is set according to the last discarded SDU (step S1 06). In addition, other SN_MRWi fields can be selectively set using other discarded SDUs (step S108). Then in step S16, it is checked whether the last discarded SDU ends with a PDU that contains the "length indication of the SDU" and does not contain a new SDU. If the condition of step S116 is true, the last SN-MRWi block ( SN_MRWlength) is set to the sequence number of the PDU ended by the last discarded SDU plus 1, and Nlength is set to 0 (step S118). Otherwise, if the situation is not true at step S116, the last SN_MRWi field (SN_MRWlength) is set to include The sequence number of the "length indicator" of the last discarded SDU, and set the Nlength equal to the "011" that contains the 1 'length indicator ff of the last discarded SDU, which has the "length indicator" corresponding to the discarded SDU. (Step S1 2 0). Then in step S1 2 2, set each other SN_MRWi field equal to containing the π length indication of the corresponding discarded SDU "

0660-A40181twf (nl); 92020; FRANKLIN.ptd Page 9 1231104 5. The serial number of the AMD PDU of the invention description (6). Next, in step S1 24, it is checked whether there is only one SIMRWi block 'and whether the corresponding discarded SDU exceeds the transmission window. If it is true, the " LENGTH, " field is set to 0 in step S126. Otherwise, the 'LENGTH11' block is set to the number of SN_MRWi fields (step S128). In step S130 · ', the preparation for transmitting the status PDU with MRW SUFI has been completed. .

Therefore, according to the received MRW SUF I, the receiver will move its receive window boundary 'and discard the AMD PDUs carrying these discarded SDUs. Fig. 4 shows a flowchart on the receiver side. When a status PDU or an entrained status PDU with MRW SUF I is received (step S200). The receiver will first check if the received LENGTH block of MRW SUFI is 0 (step S20 2). If so, the receiver can determine the number of SN_MRWi blocks (step S210), and consider the value of SN_MRW! Blocks to be greater than or equal to VR (R) (step S212), and the ordinal number is equal to or The PDU with a small kSN_mrw is discarded (step S214). However, if the LENGTH field is not 0, the receiver can determine that the number of SN-MRWi blocks is LENGTH (step S204). And the value of the SN_MRWi block is regarded as less than vr (mr) (step S206), and it is assumed that all the SN_MRWi fields are arranged in order (step "S2 08"), and then step S2i4 is performed.

In step S216, the receiver checks whether the Nlength field of the received FI is 0. If it is, the receiver will start from the first data octet of the AMD PDU with the serial number SN —MRWLENGTH block value '”,, = (step Sm). But if the N_h block is not 0, the sequence will be bluffed as SN — WL brothers of UT in AMD pDU with MRWlength field value "

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All data octets before the data octet (inclusive) indicated by the t-stop display block are discarded (step S2 1 8). The receiver starts the data repetition step S22 0 from the subsequent data octet after the last discarded data octets in the AMD PDU with the serial number SN —MR Wlength block value.) . Then, if the configuration is set to "Send MRWn", the receiver will notify the upper layer of all discarded SDUs that have not been transmitted to the upper layer and have not been discarded by other MRW SUFI (step S224, S226). On the contrary, the receiver will not inform the upper layer about the discarded SDU. Then, the receiver updates state variables VR (R), VR (H), and VR (MR) according to the received state PM or the entrained state PDU (step S228). Next, the receiver returns a status PDU or an entrained status PDU to the transmitter, which includes MRW_ACK SUFI (step S23 0). In general, after the MRW procedure ends, the conventional technology will send a person with a serial number of SN_MRWlength when the Nlength > 1 condition is established. The PDU contains at least (Nlength -1) SDUs. Full profile. However, when the receiver receives this AMD PDU, it will discard these data-complete SDUs. Therefore, in the conventional technology, this method will reduce the transmission efficiency. Here are three examples to illustrate the above problems: [Example 1] When the configuration is set to n Send MRW ", the transmitter transmits The status PDU of the MRW SUFI shown. The MRW SUF I indicates that there are 2 discarded SDUs in the AMD PDU with the serial number = 5, and the 2nd discarded SDU is completely contained in this AMD PDU, and in this AMD PDU There are still under

0660-A401811 wf (η1); 92020; FRANKLIN.p t d page 11 1231104 V. Description of the invention (8) An unoccupied SDU data octet. [Example 2] When the group sadness is set to "send MR Wπ", then the MRW SUFI in Example 1 can choose to reduce it to a siMRWi block, as shown in Figure 7B. In Examples 1 and 2, according to Xi Known technology, after the receiver responds with a status PDU containing the correct MRW-ACK SUFI or the correct ACK SUFI, the sender ends the MRW procedure. The sender will transmit or retransmit the AMD PDU with the serial number = 5. When the receiver receives When the AMD PDU arrives, the receiver will discard all the nlength of this AMD PDU (the second of example 1 and the second of example 2) " The length indicates the data octet (inclusive) specified by the π field Data octets, and data reorganization is performed starting from the next data octet. If the two previous π length indicators of the AMD PDU indicate the value of the π field is 1 0 and 1 0 0 ', then the data field is in front of The 100 data octets must be transmitted even if they are known to be discarded by the receiver. In addition, when configured as "Send MRW", the maximum number of discarded SDUs that can be covered by one MRW SUFI is 1 5. This is because actually LE The NGTH nibble is 4 bits in length, and LENGTH = 0 or 1 indicates that there is an SN-MRWi field in MRW SUFI, but it is distinguished that the PDU whose discarded SDU ends is within the transmission window or There are two different cases. Therefore, if more than 15 SDUs are discarded by the transmitter, for example, 16 procedures must be executed twice before the positive $ negative material transmission restarts. In the example shown in Example 3, The transmitter is set to "send MRW1" and 16 SDUs are discarded. [Example 3] The 16 discarded SD U ends with serial numbers respectively

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Outer 2 ′, 3 ’4’ 4 ’5, 6, 7, 8, 8, 9, 10, 12, 12, 12 PDUs. ^ 尚 ο δ / with serial number 12, he does not need to discard the data octets. Therefore, it is necessary to execute the MRW program in two steps. In Figures 7C and 7D, the MJW SUF I pair is shown. It must be noted that the last two discarded SDUs are completely included in the PDU with the serial number of 12, and the PDU will be transported after the end of the second MRW procedure. Therefore, not only is it expensive to transmit the last 2 discarded SDUs, the second MRW procedure is also unnecessary. Therefore, there is room for improvement in the conventional MRW program.

Summary of the Invention In view of this, the main object of the present invention is to provide a modified MRW program that can be executed more efficiently to solve the problems of the conventional technology. ^ In order to make the above and other objects, features, and advantages of the present invention clearer and easier to understand, the following exemplifies preferred embodiments and the accompanying drawings for detailed description as follows: Embodiments The present invention still uses The same basic MRW composite field f 'of the conventional technique, but corrects the method in which the MRW sun is established in the MRW program and the receiver interprets the received MRW SUFI.

When receiving a mrw sun, including the value of the heartbeat stop bit is greater than or equal to 丨, the receiver will discard the Nle_th "length indication in the PDU whose serial number is SNJRwLENGTH 櫊 bit value, the indicated material eight All data octets before the byte (inclusive). In the present invention, the transmitter implemented by the modified MRW program will delete the other SNs that have the same value as SN —MRWLENGTH in mr & Κ 'stop. This year old

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For differences in the conventional techniques in establishing MR W SUF I, please refer to steps S3 0 2, S3 04, and S306 of FIG. 5. After performing step §122, the new private sequence will check if there are other SN-MRWi fields with the same value as sn_MRWle_ (step S3 0 2). If the inspection finds that there is no si-body% block with the same value as SN_MRWLENGTH, then it proceeds to step S 1 2 4. If there is, it will delete other SN integration ^ blocks with the same value as SN_MRWLENGTH. Next in step ⑵06, Nlength is set to 1. Therefore, the Nlength length only needs to be 1 bit, instead of the 4 bits required by the conventional technology. The receiver operated according to the conventional technology can process the MRW SUFI transmitted by the transmitter after the correction of the present invention. However, the receiver can also be modified as shown in Figure 6 and can also be used with transmitters that operate according to conventional techniques. After the transmitter finishes executing the program, when receiving the AMD PDU with the serial number SN-MRWLENGTH, referring to step S216 in FIG. 6, the receiver will check whether the Nlength in the received MRW SUFI is 0. If Nlength is 0 ', the process proceeds to step S 2 2 2. Conversely, if nlength is not 0, the first "length" of the AMD PDU whose serial number is the value of the SN_MRWLENGTH field indicates all data X bits before the data octet (inclusive) indicated by the π block The tuples are discarded (step S 4 0 0). The receiver starts the second set of new data from the first subsequent data octet after the last data octet (step S 22 0). # 4

In the cases described in Examples 1 and 2, in the present invention, 100-10 = 90 bytes of the first complete SDU included in the sequential AMD PDU can be received by the receiver with a correctly received SDU To deal with, when the configuration is set to “n Send MRW”, MRW SUFI does not need to be equal to α 1 and output 5

Individual information

1231104 V. Invention Description (11) The discarded SDU included in the PDU of SN-MRWLENGTH. In addition, the maximum upper limit of the J NLENGTH field is 1. Therefore, in the present invention, the team length only needs 1 bit, instead of the 4 bits of the conventional technology. Therefore, in Example 3, the present invention only needs one MRW procedure to deliver the message of discarded SD1]. In addition, ‘MRW SUF I can reduce the length of one sN_MRWi field (12 bits) ·.’ The reduced MRW SUFI can refer to the figure μ. With the mechanism of the present invention, after the MRW procedure is terminated, the SDU that is completely included in the first transmission of AMD PDU will be treated as a normal SDU, so the transmission efficiency of the wireless communication system can be enhanced. In addition, if the SDU discarded by the sender is completely contained in 彳 n, that is, the am-d p two and two two messages that are transmitted first after the termination of the MW program; knowing that the receiver's performance can be reduced: m In some cases it is possible to reduce one MRW program. However, although the present invention has been limited to the present invention by any means, any practice is to clear the way as above. However, it is not intended to be used within the scope. It can be disagreeable, without departing from the spirit of the invention. Attached to the application; ;;; Therefore, the protection of the present invention ~ ~ has been defined as the standard.

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Figure 1 shows a schematic diagram of the MRW SUFI structure of a status PDU; Figure 2 shows a simplified MRW procedure that is not between the transmitter and receiver; Figure 3 shows a flowchart of the MRW procedure that establishes mrw SUFI on the transmitter side. Figure 4 shows a flowchart of a conventional technology receiver processing a stream that is received in order. Figure 5 is a flowchart of a mRW procedure after the transmitter does not perform the correction according to the embodiment of the present invention. Figure 6 is not according to the embodiment of the present invention. The receiver processes a flowchart of receiving MRW SUFI; Figures 7A-7E show various questions in Example 3? Schematic of SUFi. Explanation of symbols 2 ~ Movement window composite field (MRW SUFI); 4 ~ type block; 6 ~ length block; 8 ~ 14 ~ SN-MR% field; 1 6 ~ Nlength shelf.

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Claims (1)

1231104 VI. Scope of patent application 1. A processing method of a moving receiving window (MRW) program for preparing a state agreement with a moving receiving window compound stop (MRW super-field, MRW SUFI) Data unit (Protocol Data Unit, PDU), which is suitable for the sender to inform the receiver about the range of the receiving window or to discard some Service Data Unit (SDU). Among them, a MRW SUFI is established in the above procedure. Blocks, such as the TYPE field and the LENGTH field: SN —MRWi field, SN —MRWLENGTH field (last SN —MRWi field), and Nlength field 'and each PDU has For a corresponding serial number, the above processing method includes the following steps: Perform the following steps at the above transmitter: Start the above MRW program according to a plurality of trigger events; check whether it is a 11-Send MRW configuration and respond accordingly Ground action; the last SN-MRWLENGTH discarded SDU is discarded and the Nlength stall is set up, when a non-SN_MRWlength stall with the above sn- When the MRWlength field has the same value, delete the SN-MRWi block 'which has the same value as the SN-MRWlength and set the Nlength block to 1; and set the LENGTH field accordingly. 2 · The mobile receiving window procedure processing method described in item 1 of the scope of patent application, wherein one of the above triggering events is due to the expiration of the time limit. 3. The mobile receiving window procedure processing method described in item 1 of the scope of patent application, wherein one of the above triggering events is that the number of retransmissions of a PDU exceeds the 0660-A40181twf (nl); 92020; FRANKLIN.ptd page 17 1231104 6. Scope of patent application Maximum limit for the number of retransmissions. 4. The processing method of the mobile receiving window procedure as described in item 1 of the scope of patent application, wherein the steps of establishing the SN_MRWlength field of the last discarded SDU and establishing the ΝίΕΝ (ίΤΗ field) further include the following steps: The discarded SDU ends with a "011" containing the "length indication" of the last discarded SDU, and the PDU does not include a new SDU. The SN-MRWLENGTH field is set to the serial number of the PDU plus 1, and Set Nlength to 0; and vice versa, if the above PDU still contains at least one paragraph of a new SDU, set the SN_MRWlength field to the serial number of the above PDU, and set Nlength to 1 ° 5. As described in item 1 of the scope of patent application The processing method of the mobile receiving window program, wherein the steps of setting the above LENGTH field accordingly include the following steps: If only one SN_MRWi field is transmitted in MRW SUFI and the serial number of the above SN_MRWi field exceeds the range of the transmission window, Then set the above LENGT frame to 0; otherwise, set the above LENGTH field to the number of SN_MRWi fields. The processing method of the mobile receiving window program described in item 1 of the patent scope, wherein the step of checking whether it is the configuration of π transmitting mobile receiving window, further includes the following steps: If the "transmitting mobile receiving window π flag is set , And if the number of discarded SDUs exceeds 15, the above MRW SUFI is established for the first 15 discarded SDUs, and other discarded SDUs are processed; and 0660-A40181twf (nl); 92020; FRANKLIN.ptd Page 18 1231104 The flag of "Send mobile receiving window" is set, and for each discarded, ΓΓΛ corresponds to Λ-one SN-MRw = two-principle method, \ = steps of the mobile receiving window procedure described in item 6: ten processing The other discarded steps include the following PDUs, including the 15th discarded SDU length PDU, including two other discarded SDUs and at least one SI of an undiscarded SDU. Bell 1 mentioned above for the other discarded SDUs; and SDUs. Otherwise ’Μ uses other MRW procedures to handle the other discarded 8 ^ The mobile receiving window procedure described in item i of the stated patent scope. Method J 'wherein the length of the Nlength block is 1 bit. . 9. · A processing method of a Moving Receiving Window (MRW) program for preparing a status agreement data unit (PDU1 Data Unit, PDU) with a mobile receiving window compound stop (MM super-field, MRW SUFI) , Which is suitable for the sender to inform the recipient about the range of the receiving window of the mobile itself or the Service Data Unit (SDU) that should be discarded, in which a mrw is established in the above procedure Blocks in SUFI, such as type (τγρΕ) field, length (LENGTH) field, SN-MRWi field, SN —MRWLENGTH field (last SIMRWi field), and ^ LENGTH $ bit 'and every one The PDU has a corresponding serial number. The above method includes the following steps: The receiver performs the following steps: · Receives a status PDU with MRW SUFI from the transmitter; 1231104 6. The scope of the patent application checks the value of the above LENGTH block and discards pDu accordingly. · When the value of the above Nlength block is 0, the sequence number ^ PDU t ^ ^ ^ t # ^ ^ M ^, Zr Z f iN-MRWH J ^ Enter the reorganized lean material; if the value of N and H fields is not 0, discard the data octets indicated by the first "length indication" block in other PDUs. All data octets before (inclusive) 'and reorganize data starting from the first subsequent data octet after the last discarded data octet in pM above. 1. The processing method of the mobile receiving window procedure as described in item 9 of the scope of patent application, wherein the steps of checking the value of the above-mentioned LENGTH block and discarding the PDU accordingly, further include the following steps: 8. If the above-mentioned LENGTH block is When the value is 0, the received SUFI is processed with only one SN —MRffl field (ie, SN —MRWlength); otherwise, if the value of the above LENGTH field is not 0, then the LENGTH SN —MRWi The way of the field, that is, from other-MRW! To, SN-MR WLENGTH, to process the received MRW SUFI, and discard all pdus before the serial number equal to (SN-MRWLENGTH-1) (inclusive). ', 11 · A transmitter that uses a mobile receiving window (MRW Receiving Window, MRW) program to prepare a state agreement data with a mobile receiving window compound stop (MRW super-field, MRW SUFI) Unit (Protocol Data Unit, PDU), which is suitable for the sender to know that the receiver has to move the range of the receiving window or discard some services " Service Data Unit (SDU), which is established in the above procedure 1231104 6. Scope of patent application-Fields in MRW SUFI, such as TYPE field, LENGTH field, SLMRWi field, SN_MRWlength field (last SN-MRWi stop) and ΝίΕΝαΝ field And each agreement data unit has a corresponding serial number, the transmitter includes: a device for starting the MRW program according to a plurality of trigger events; a device for checking whether it is a π transmission mobile receiving window (Send MRW ) n The device configured and acted accordingly; a device for establishing the SN_MRWlength block of the last discarded SDU and establishing a ^ · ΤΗ field; a device for when a non-SN_MRWlength field and the above SN_MRW_TH field have When the value is the same, a device that deletes the SN-MRWi field with the same value as the SN_MRWU_ and sets the 叱 ΝαΗ field to 1; and a device for setting the LENGTH stop accordingly. 1 2. The transmitter according to item 11 of the scope of patent application, wherein the device for establishing the SNJRW ·· field of the last discarded SDU and the Nlength field further include: One is used to check whether the last discarded SDU ends with a "length indication" containing the last discarded SDU? 011, and the above PDU does not include a new SDU device; a device for setting the SN_MRWkEN (iTH field to the serial number of the above PDU plus 1 when the above check condition is true) When setting NUNeTH to 0 0660-A40181twf (nl); 92020; FRANKLIN.ptd Page 21 1231104 6. Application for Patent Scope; and a device to check whether the above PDU still contains at least one paragraph of a new SDU; one for the above inspection conditions: When true, a device that sets the SN_jRWlength bit to the serial number of the PDU; and a device that sets 叱 ㈣ ^ to 1 when the above-mentioned check condition is true. 1 3 · The transmitter as described in item 11 of the scope of patent application, wherein the above-mentioned corresponding device for setting the LENGTH field further includes: A device used to check whether only one SN-MRWi block is transmitted in MRW SUFI and the serial number of the SN-MRWi block exceeds the transmission window range; a set the LENGTH block when the above-mentioned check condition is true A device with a bit of 0; and a device for setting the above-mentioned stop to the number of SN-MRWi fields when the above conditions are not satisfied. '1 4 · The transmitter as described in item 11 of the scope of patent application, wherein the above-mentioned checking device is a π transmission mobile reception window " configured device, and further includes: a π transmission mobile reception window for checking whether or not The flag is set by the set; & A device for checking whether the number of discarded items exceeds 15 when the above flag is set; a device for establishing the above MRW SUFI for the first 15 discarded SDUs when the above flag is set, and A device for processing other discarded mu; and a device for setting each discarded when the above flag is set 0660-A40181twf (nl); 92020; reANKLIN.ptd 1231104 Sixth, the scope of patent application SDU corresponds to a device that sets a SN_MRWi stop. 1 5 · The transmitter as described in the scope of patent application 苐 14, wherein the device for processing other discarded SDUs further includes: a PDU for checking whether the length indication of the 15th discarded SDU includes all of the above Other discarded SDUs and one undiscarded SDU, at least one paragraph of devices are used to ignore the other discarded SDUs when the above-mentioned inspection conditions are true; and-one is used when the above conditions are not true Other MRW programs handle the other discarded SDU devices described above. 1 6 · A receiver using a mobile receiving window (μ 0v i ng Receiving Window (MRW) program to prepare a state agreement with a mobile receiving window composite field (MRW super-field, MRW SUFI) A data unit (Protocol Data Unit, PDU), which is suitable for the sender to inform the receiver about the range of the receiving window or to discard some Service Data Units (SDUs). The MRW SUFI is established in the above procedure. Fields, such as the TYPE field, the LENGTH field, the SN —MRWi field, the SN —MRWlength field (the last SN_MRWi field), and the Nlength field, and each agreement data unit has A corresponding serial number, wherein the receiver includes: A device for receiving a status PDU with MRW SUFI from the above-mentioned transmitter; a device for checking the value of the above-mentioned LENGTH field and discarding the pdu accordingly; a device for checking whether the above-mentioned NLENGTH block value is 0 ; 〇660-A40181twf (nl); 92020; FRANKLIN.ptd 1231104 VI. Application for a patent scope-a device for reorganizing data starting from the first data octet in a PDU with a serial number equal to SN_MRWLENGTH when the above inspection result is true;-a device for checking whether the above Nlength field A device with a value other than 0; one for discarding the data before octet (inclusive) of the data indicated by the first π-length indicator in the PDU with the serial number · SN —MRWLENGTH when the above inspection result is true; All data octets; and A device for reorganizing data from the first subsequent data octet after the last discarded data octet in the above pDu when the above inspection result is true. 17 The receiver according to item 16 of the scope of patent application, wherein the device for checking the value of the LENGTH field and discarding pj) u accordingly further includes: a device for checking whether the LENGTH field is A device with a value of 0; a device for processing the received MRW with only one SN-field (that is, SN-MRWLENGTH) when the above inspection conditions are true; & The device whose value of the length field is not 0; Used when the above-mentioned inspection conditions are true, in the form of individual fields of LENGTH, that is, from SN-MRW to SN MRW, the device of MRW SUFI of Lukechara: ™ processing received a When the above-mentioned inspection total # 士 +, ςN is true, all devices with a serial number equal to (SN —MRWLENGTH-1) (3) are discarded.