TW200409510A - Processing unexpected transmission interruptions in a wireless communications system - Google Patents

Abstract

A radio link control (RLC) layer provides RLC entity information to a medium access control (MAC) layer. The RLC entity information indicates that the RLC layer has service data unit (SDU) data to be transmitted. After providing the RLC entity information, the RLC layer receives an unexpected data interruption that requires the RLC layer to discard or interrupt transmitting the SDU data. After the unexpected data interruption, the MAC layer requests at least a protocol data unit (PDU) from the RLC layer in response to the RLC entity information. The RLC layer then submits to the MAC layer at least one padding PDU in response to the MAC request. The padding PDU is submitted in place of the discarded SDU data. Alternatively, the affected SDU data is not discarded until the next transmission time interval (TTI).

Description

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The present invention relates to a processing method that causes unexpected interruption during the transmission process of a helmeted fighter who wants to benefit you ..., green tadpoles, DT. 1 n Refers to the scheduling control of the interruption between the wireless link control (Rad10Lmk Control, RLC) layer and the media access control (Media Access control, MAC) layer. Field of the Invention Prior Art 1

Many communication protocols usually use a three-tier communication architecture to communicate with each other. Please refer to Figure 1. Figure 1 is a block diagram of a three-layer communication architecture protocol. In a general wireless environment, the 'first station 10 communicates wirelessly with one or more second stations 20. A communication application ^ in the first station 10 generates / applies an application §fl1 1 1 'and delivers this application message 11 to a third layer interface 12 in order to transmit this application message 11 to the second station 20 . The third-layer interface 12 can also generate a first-layer message, 1 2 a ′, to control the third-layer operation between the first station 10 and the second station. For example, the third layer signal message 2a may be a key switch request. This key switch request can be generated individually by the third layer interfaces 12 and 22 of the first station i 0 and the second station 20. The third layer interface 12 delivers application messages 11 or signal messages 12a to the second layer interface 16 in the form of service data units (SDUs) in the second layer.

The SDU 14 of the second layer may have different sizes. The SDU 14 carries data that the third layer interface 12 wants to deliver to the second station 20, and such data may be the signal message 12a or the application message 11. The second layer interface 16 forms the received SDU group into one or more second layer protocol data units (PDUs) 18. The length of each Layer 2 PDU 18 is fixed. And every second layer PDU 18 will be delivered to the first layer

200409510 V. Description of Invention (2) Interface 19. The first layer interface 19 is the physical layer and is responsible for transmitting data to the second station 20. The transmitted data is received at the first layer interface 29 of the second station 20, and then reassembled into one or more pD u, and then uploaded to the second layer interface 26. The second-layer interface 26 receives the PDU, and then reassembles the PDU into one or more second-layer SDUs, and then uploads it to the third-layer interface 22. Next, the third layer interface 22 converts the received SDU to an application message 21 or a signal message 223. This message should appear on the third layer 12 of the first station 10 The original application message 1 1 or the signal message 1 2a is the same. If it is the application message 21, it is delivered to the communication application 23 in the second station 20 for processing. Here, the definition used in the general communication nomenclature, PDU refers to a unit of data transmitted between a certain layer and its lower layer, and SDU refers to a unit of data transmitted between a certain layer and the upper layer. Therefore, a layer 3 PDU may be called a layer 2 SDU. In the same way, a layer 2 PDU may be called a layer 1 SDU. For clarity and convenience of explanation, the following abbreviations "SDU" refer to the second-layer SDU (that is, the third-layer PDU), and the abbreviation "PDU" refers to the second-layer PDU (that is, the first-layer SDU). The present invention Focus on the second layer interface that plays the buffer role between the third layer (responsible for higher-level data transmission and reception) and the first layer (responsible for lower-level entity transmission and reception). Please refer to Figure 2. Figure 2 is a schematic diagram of the processing of the second layer data transmission and reception. A transmitter 30 (which may be a base station or a mobile terminal) receives a string of SDUs 34 from the second layer interface 3 2 from the third layer interface 33. It is assumed that the sizes of these SDus are different (as shown in the figure), and they are numbered sequentially from 1 to 5. The second layer interface converts a string of $ DU 34 into a string of PDU 36. This string of PDUs is assumed to be numbered 1 to 4, and each

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200409510 V. Description of the Invention (3) The lengths of the PDUs are the same. This string of PDUs 36 is sent to the first layer interface 31 and is ready for wireless transmission. The opposite process occurs at the second layer interface 42 of the receiver 40 (which may be a base station or a mobile end), which converts a series of received pDUs 46 into a series of SDUs 44. In some specific transmission modes, the multi-layer agreement may require that the second layer interface 42 in the receiver 40 must send the SDU 44 to the third layer interface 43 in order. In other words, the order in which the second layer interface 42 is transmitted to the third layer interface 43 must start with SDU 1 and end with SDU 5. The order of SDUs must not be disturbed, and subsequent SDUs cannot be transmitted by the previous upper layers before the previous SDUs have been uploaded to the third layer.

In a wired communication environment, such requirements are easily met. However, in a noisy wireless communication environment, whether it is a base station or a mobile terminal, the receiver often misses data. In addition, in some transmission modes, if the second-layer SDU 34 has not been successfully transmitted for more than a predetermined time, the second-layer interface 32 of the transmitter 30 will actually discard these SDUs 34. The discard function of discarding transmission is controlled by the discard timer corresponding to each SDU. If an SM's discard timer exceeds the timeout, the SDU and the associated PDD will be discarded together.

abandoned. Therefore, in a series of layer 2 PDUs 46 that should be received, some layer 2 PDUs 36 may be missed, either because the transmitter 30 has discarded them or because the receiver 40 has missed the data. Therefore, the need to ensure that the second-layer interface 42 sequentially sends SDU 44 to the third-layer interface 43 is an obvious challenge. Even if the "sequential" delivery mode is not required (that is, the system does not require that SDU 44 must be passed up in order), before the relevant pDu has been received correctly, any incomplete 31) 11 44 also Not before

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5. Description of the invention (4) Transmission. Wireless communication protocols are very carefully designed to face such a problem. Generally speaking, there are two common modes for transmitting and receiving data: acknowledged mode (AM) and unacknowledged mode (unacknowledged mode, UM). )transmission. For AM data, the receiver 40 sends a specific Layer 2 acknowledgment signal to the transmitter 30 to know that it has successfully received the Layer 2 PDU. The transmitter 30 can then retransmit " send AM PDUs that have not been successfully received, to ensure that the receiver 40 can correctly receive all PDUs. In the UM mode, there is no such acknowledgement signal. Therefore, no matter whether the transmission is successful or not, the UM PDU will not be retransmitted. In this manual, AM data is used as an example. However, there is no doubt that the MM data can also be applied to the present invention. Please see Figure 3 and refer to Figure 1. Figure 3 is a simplified block diagram of an AM data PDU, as contained in the 3GPPTM TS 25.322 V3.8.0 specification. Generally speaking, there are two types of PDUs: control PDUs and data PDUs. The control PDU is usually used by the second-layer interfaces 16 and 26 to control the data transmission and reception protocols; for example, the second-layer acknowledgment signal used to confirm the received signal is one of them. The exchange of confirmation messages of the second layer interface is similar to the exchange of signal messages 1 2a and 2 2a between the third layer interfaces 2 and 2 2. The second layer interfaces 16 and 26 do not interpret or recognize the third layer signal messages 12a and 22a, they are only treated as SDU data. However, the second layer interfaces 16 and 26 will recognize and process the second layer control PDUs. Therefore, the second layer control PDUs will not be uploaded to the third layer interfaces 12 and 22. The data PDU is used to transmit SDU data. It will be reassembled by the second layer interface 26 of the second station 20 and uploaded to the third layer in the form of SDU.

200409510 V. Description of the invention (5) Interface 2 2. PDU 50 in Figure 3 is a data PDU. According to the agreement of the second layer, the data PDU is cut into many fields. The first block 51 is a PDU format identification block, which has only a single bit to indicate whether the pDu is a data PDU or a control PDU. If the value in the field is 1, this pDu 50 is a data PDU. The second stop is a serial number (SN) field 52. During AM transmission, this field is 12 bits long. Subsequent pj) u will have a higher serial number, so that the receiver (ie, the second station) 20 can correctly combine the received PDUs, and then form the second layer SDU 24. For example, if a PDU 18 with a serial number of 536 is transmitted, the next PDU should carry a serial number of 537, and so on. A retransmitted pj) u may carry a sequence number 535, indicating that the PDU should be inserted before the PDU with a sequence number 536. Although, in real time, the pdu with the serial number 535 is received later than with the serial number 536. However, according to the sequence of received PDUs, the correct SDU can be generated exactly. The serial number block 52 allows the retransmitted P D ϋ to be inserted in an appropriate position before the p du received earlier. With this method, the purpose of data retransmission can be achieved. Behind the serial number field 52 is a single-bit polling bit 53. If the polling bit 5 3 is 1, it means that the receiver 20 is required to send a confirmation status pDu in response. Acknowledgement status A PDU is a type of control PDU that is used to indicate the reception status of a PDU. The sender (ie, the first station) 10 can set the polling bit 5 3 to 1 to request the receiver 20 to send a confirmation status PDU. The single-bit field 54 is currently reserved, and is not defined, but is generally set to 0. The next bit 55a is an extended bit. When bit 5 5 a is set to 1, it means that the following is immediately connected to a length indicator

0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 10 200409510 V. Description of Invention (6) (length indicator, LI) ° LI has either 7 bits or 15 bits; it is used to indicate End position of a Layer 2 SDU in the Layer 2 PDU 50. If an SDU alone completely fills the data area 5 8 of the PDU 50, the bit 5 5a should be 0, indicating that there is no L I field in the PDU. In the example in Fig. 3, the PDU 50 has two second-layer SDUs 57a and 57b that end in the second-layer PDU 50. Therefore, there are two LIs to indicate the end of the second layer SDUs 57a and 57b, respectively. Subsequent PDUs of this PDU 50 (differentiated by sequence numbers) may have a LI to indicate the end of SDU 57c. The extension bit 5 5 b following L L is set to 1, which means that there is a LI (that is, LI2 in the figure). The extension bit 55c following LI2 is set to 0, which means that there will be no L I in the future, and the data area 58 will start immediately after this extension bit 55c. The data area 58 is used to place actual SDU data. Please refer to Figure 4 and Figure 5. Figure 4 is a detailed block diagram of a second layer interface 60; Figure 5 is a time diagram of a number of transmission periods (t r a n s m i s s i ο η time interval (TTI) 72). The second layer interface 60 has a radio link control (RLC) layer 62 'which is located above the medium access control (MAC) layer 64 and is interconnected with the MAC layer 64. Such an arrangement can be known from the conventional 3GPPTM TS 2 5.32 1 V3.9.0 specification. The MAC layer 64 serves as an intermediate interface between the RLC layer 62 and the first layer interface 61. From the perspective of an upper layer (the RLC layer or higher), many communication channels have been established, and each communication channel has its own transmission parameters. However, functionally, these communication channels must be aggregated into a single bit stream to be presented to the first layer interface of the entity.

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200409510 V. Description of Invention (7) 1 Reality = One of the main purposes of AC layer / 4. The mac layer 64 transmits in each of two: m. For a communication channel, the duration of the two Um 72 is the same, for example, ^. However, the TTI of the communication channel may have different time lengths. That is, its i ^ RLC entity, TTI may have different lengths of time. ▲ When entering the communication process of the government, there may be many communication channels. In the discussion, first assume that there is only one communication channel, that is, there is only one RLC layer 62 to facilitate the explanation. In each time length of ^ 72, the 'MAC layer 64 sends a whole set of transmission blocks 74a to the first layer 61 for transmission. The transmission block 74a of the entire group 74 contains a predetermined number of transmission blocks 74a. Each transmission block 74a includes an RLC pj) u 75 and a presence or absence of a MAC header 76, depending on the nature of the communication channel. In a TTI, all 1 ^ (: pDU 75 (or transmission block 74a) have the same length. The number of RLC ρ 75 in a whole group 74, or transmission block in a whole group The number may vary with TTI 72. For example, in Figure 5, the first TTI 72 transmitted 6 PDU 75, and the next Ding 72 transmitted 3 75. The actual PDU data The size may also vary with m, but 疋 must be the same in the same τ TI. Therefore, before each τ τ I transmits the entire set of transmission blocks, the MAC layer 64 needs to inform the RLC layer 62 that at this TTI The required number of PDUs and the size of the PDUs. This is called transport format combination (TFC) selection and is used to arrange the data transmission traffic from the RLC layer 62 to the MAC layer 64. The TFC chooses to make MA (:

200409510 V. Description of the invention (8) The layer 64 can generate an effective bit string data to the first layer physical interface 61 according to the different requirements of each RLC layer entity 62. According to the result of TFC selection ', SDU 6 5a will be stored in register 65 first, and then divided and reassembled into pDU 65b of the size required by TFC selection by RLC layer 62, and then RLC layer 62 will deliver the number and size of TFC selection requirements. PDU to MC layer 64. As mentioned earlier, the 'MAC layer 64 will add a MAC header 76 to each PDU 75 depending on the nature of the communication channel to become a transmission block 74a in the entire group 74. Then a whole set of 74 transmission blocks 74a are sent to the first layer interface 61 of the entity to be sent out.

Refer to Figure 6 and compare with Figure 4. Figure 6 is a timing diagram of TFC selection in the prior art. In order to send at least a part of sdu 65a 'TTI 82 within a TTI, the TFC selection must be completed in the previous TTI (that is, TTI 81). In TTI 81, the 'RLC layer 62 needs to inform the MAC layer 64 about the RLC entity information 84. RLC status

The material 84 enables the MAC layer 64 to know how many SDU data 65a are waiting to be transmitted by the RLC layer 62. Corresponding to the RLC complaint data 84, the MAC layer 64 responds to the RLC layer 62—TFC data request 86. The TFC data request 86 indicates the size and number of PDUs 6 5b transmitted by the RLC layer 62 to the MAC layer 64. The number of data requests 86 * pDU mentioned above may not be enough to cover all the SDU data 65a to be transmitted. If so, the RLC layer needs to make another TFC selection in TTI 82 in order to transmit the remaining SM data 65a in the next TTI 83. Regardless of whether the TFC data request 8 6 is sufficient to cover all § d u data 6 5 a, the R L C layer 62 2 complies with the T F C data request 86 and combines an appropriate amount of SM data 6 5a into a PDU 65b of the required size. These pj) u 65b are then delivered in a set of 88

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200409510 V. Description of the invention (9) To the MAC layer 64. In TTI 82, does the MAC layer 64 handle the whole set of 88? 1) 1] 65b, and then send it to the first layer interface 61. In TTI 82, ττι selection is performed again for data transmission of TTI 83. The SDU data 65a combined into pDU 6 5b is removed from the register 65.

SDU 65a may also be removed from the register 65 due to timeout. Each SDU 65a has an expiratiQn time and is tracked by a discard timer. If the discard timer indicates that an SDU 65a has exceeded its expiration date, the SDU 65a will be discarded from the register 65 without being transmitted. From the perspective of the R L C layer 62, this may be a random event that can occur at any time. And such an event may also occur after the RLC layer 62 sends the RLC status data 84, and the number of sdu 65a to be transmitted in the RLC layer 62 is generally smaller than that described in the RLC status data 84. However, as soon as the “layer” responds to a TFC data request for 8 6, the RLC layer 6 2 must transmit a PDU of the size and number required by τ j? C data request 86. If it is not implemented as required It will be regarded as a software error of the wireless communication component. This problem has been encountered in the prior art and is very important for the scheduling of data transmission. In the prior art, if the RLC layer 62 informs-(^ layer "about After SM 65a is ready to be transmitted, an SD U 6 5 a timeout occurs, and the actual discard action will be delayed to the next TTI. Using this method, the RLC layer 62 can ensure that there are enough SDUs to constitute A whole set of "⑼ ^. In Τί82, if the timed out SDU is not within the whole set of PDUs scheduled to be transmitted, it can be discarded directly before the TFC selection made for 7TTI 83 without the need of Delay the discard action.

200409510 V. Description of the invention (ίο) However, in addition to the above conditions, there are other unexpected materials that have not been tested by the prior art. Figures 4 and 6 are shown. Most of them. Please refer back to the first figure, and refer to the eighth pass from the interface 12 to the second layer interface 16 caused by the first layer, the poor πει, DT P J and the sun. Therefore, the horn sound of the RLC layer 62 is used to capture the peak period. These interruptions include stop-degrees; those interruptions are unpredictable, (stOP), suspend, and re-establish instructions. ^ Ji Cong, μ ^ In addition, the reset $$ of the second layer also caused an unexpected data interruption. When the third-level interface is determined to cut the base station's day guard, the second-level interface 12 starts a stop-and-send command for the second-level interface 16. The stop instruction requires the second layer interface 12 to immediately stop the transmission of the SDU lean material 65a. Therefore, even if the TFC data request has been received, the PDU 6 5b must be withdrawn from the state to be sent to the MA (: layer) to stop the transport. The rebuilding action is initiated by the third layer interface 12 and the third layer interface 12 will issue a rebuild command to the second layer interface to rebuild a communication channel. As the rewrite command literally means, a communication channel will be completely closed and then rebuilt. Similarly, when the rebuild command occurs, it may cause the MAC layer 64 stays in a state where a TFC data request is not fulfilled. When the third layer interface 12 decides to change the encryption structure between the first station 10 and the second station 20, the third layer interface 12 will start a pause instruction. The pause command is sent by the second-level interface 12 to the second-level interface 16 in a manner with a parameter η. This parameter η specifies the second-level interface 16 and stops transmitting data after sending n PDUs 65b next. The purpose of this parameter η is to provide enough time (using PDU as the calculation unit) to enable the key synchronization procedure between the first station 10 and the second station 20. Generally, if η is large enough, the RLC layer 62 will meeting Enough

200409510 V. Description of the invention (li) ----- sufficient time is not enough to prepare in advance without causing the _TFC data request to be unsatisfied. However, if n is small, the RLC layer 62 may have to withdraw the sent PDU 6 5b, so that the TFC data request cannot be satisfied. Finally, the reset operation will be explained. When a communication channel detects a communication error, the second layer 16 will perform a reset operation. In essence, these communication errors are unpredictable, and either the first station 10 or the second station may trigger such a reset action. The reset action will clear all state variables and all materials stored in all registers of a corresponding communication channel, or set them to default values. Therefore, the SDU 65a or PDU 65b will be removed under the reset action, so it may cause the 'MAC layer 64 to stay in a state waiting for a TFC data request without response. SUMMARY OF THE INVENTION In view of this, the main object of the present invention is to provide a method and a corresponding system to deal with the unintended transmission interruption between a shore in a wireless communication system and the MAC layer. According to the above object, the present invention proposes a method and system for processing unexpected data in a wireless communication element between a -RLC layer and a -MAC layer. The RLC layer provides RLC entity information to the MC office layer. The RLC entity message indicates that the RLC layer has an SDU waiting to be transmitted. After presenting the RLC entity message, the RiX layer received —unexpected #, and asked the RLC layer to give up or interrupt the transmission of the _. Message, the MAC sends a MAC request, asking the RLC layer to send at least two = PDUs. In response to the MAC request, the RLC layer sends the mAc layer to a * PDU to replace the dropped SDU. Another way is to change what should be

200409510 V. Description of the invention (12) The SDU is reserved and will not be discarded until the next TTI. The advantage of the present invention is that, regardless of whether a transmission interruption occurs, the RLC layer always meets the requirements of the MAC request to provide sufficient data to the μ AC layer, so the danger of software instability is avoided. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings, and described in detail as follows: Implementation: «In the following description, the transmitter Or the receiver can be a cellular telephone, a personal digital assistant (PDA), a personal computer (PC), or any other component using a wireless communications protocol . The invention can be applied to wireless communication protocols or other wireless systems as discussed in the background of the invention. After reading this specification, 'a person familiar with this technical field can modify the known technology' to realize the differences between the present invention and the known technology. Please refer to FIG. 7. FIG. 7 is a block diagram of a wireless communication component 100 according to the present invention. The wireless communication device 100 includes a processor 110 and a memory 120. The memory 1 2 0 stores a program code 130 to be executed by the processor. Of course, the 'wireless communication element 100' requires many other elements known to those skilled in the art. It is just that those other elements are not relevant to the present invention and are omitted in this description. Cheng Shima 130 is used to implement wireless communication protocols. The communication protocol includes an application layer 134, a third layer interface 133, a 200409510, a description of the invention (13) a second layer interface 132, and a first layer interface 131. Other arrangements between the processor 110 and the memory, and how the code 130 makes the two interact, may be acceptable. And various hardware or software interfaces used to implement the first layer interface 131 may also be acceptable. The block diagram in Fig. 7 is only a simplified diagram and is not the only embodiment. Regardless of the manner in which the invention is implemented, the main focus of the invention is on the wireless communication protocol itself ', especially the portion of the second layer interface 132.

The first layer interface 132 is divided into several layers' including an RLC layer 142 and a MAC layer below it. The RLC layer 142 is responsible for interacting with the third layer interface 133, and receives the third layer data in the form of SDU and stores it in the temporary register 143. The RLC layer 142 also receives commands from the third layer interface 133, such as the pause, stop, and rebuild commands discussed previously. The RLC layer 1 42 uses the SDU 141 to generate a PDU 145, and then sends the PDU 145 to the MAC layer 144, ready to be transmitted. The size and number of PDUs 145 transmitted to the MAC layer 144 are specified by a TFC data request sent from the MAC layer 144 to the RLC layer 142. The timing for the MAC layer 144 to send a TFC data request is after the RLC layer 142 informs the MAC layer 144 in the RLC state data format that the RLC layer 142 has the amount of SDU data to be transmitted. In the first embodiment, the method of the present invention is to make the RLC layer 142 provide at least one padding PDU 150 to satisfy the TFC data request generated by the MAC layer 144. This blank PDU 150 does not carry real SDU data 141, and is only used when the SDU data 141 is discarded because of unexpected data interruption. Please refer to Figure 8a. Figure 8a is a detailed block diagram of p D U 1 50. Fill in the blank p d u 1 5 0 a is a standard confirmation mode

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(acknowledged mode ’AM) data PDU, so the PDU format identification block

Bit 151a is set to one. The serial number block 152 & is a standard serial number, and the polling bit 1 53a can be 0 or 1 (defined by the second layer interface 32 according to the polling status). Block 154a is reserved and its value is set to zero. The next extended bit 155 & is always set to 1 to indicate that it is followed by! ^ L56a. However, a special code is set in u to 1 5 6a, and all bits are 1. The length expressed by this special code will greatly exceed the total length of the data area. According to the definition of LI length by RLC entity ’, the length occupied by 156a may be 7 bits or 15 bits. In Figure 8a, the LI length is 15 bits. This special LI 156a means that the remaining undefined parts of the pDU i50a are just filled in, and they are just with a message that can be ignored and not defined. However, the next bit 1 5 7 a immediately after L I 1 5 6 a must be 0 to indicate that the following is the start of the SDU data area 158a. The content in the SDU data area 158a is not defined, and it is purely for filling the position. It should be noted that under UM transmission, the UM data PDU format is used as a fill-in-pdu. Fig. 8b is a block diagram of a UM data filling blank PDU 15 0b. Relatively speaking, UM data fill in blank PDU 1 50b is much simpler in structure, there is a seven-bit length serial number field 15 2b, followed by an extended bit 155b (set to 1), and then all A seven-bit length of LI 1 5 6b set to 1 (indicating that the following data is a fill-in block), and a final extension bit set to 0 (indicating that there is no LI afterwards). The actual bit length of LI 1 56b is based on the maximum UMD PDU size in the UM RLC entity defined by upper layer 1 33, which may be 7 or 15 bit length. In Figure 8b, the bit length of LI is 7 bits. As mentioned earlier, because the entire PDU 150b is a blank PDU, the SDU data area

0660- 88321wf (η 1); P- 90060TW; EDWARD. Ρ td page 19 200409510 Description of the invention (15) 1 5 8 b is undefined and can be put in any value. The preferred embodiment utilizes a fill-in-PDU (the AM rLC entity uses fflpDU 150a and the UM RLC entity uses PDU 150b) as a replacement PDU 150. These replacement PDUs 150 are used as padding and passed to the MAC layer 144 to satisfy the required PDU size and number in a TFC data request sent by the MAC layer 144. Please refer to Figure 9 and compare Figures 7, 8a and 8b. Fig. 9 is a timing chart of data transmission according to the present invention. As mentioned earlier, the MAC layer 44 defines a series of equal length ττΐ for the RLC layer 142. In order to be able to transmit data during the TTI 162 period, the T F C selection for data scheduling must be completed in the previous TTI 161. To initiate a TFC selection, the RLC layer 142 sends RLC # status data 1 64 to the MAC layer 144. As described earlier, the RLC status data 164 informs the MAC layer 144 how many SDU data 141 are stored in the register 143 of the RLC layer 142 and waiting for transmission. After a period of time, the MAC layer 144 responds to a TFC data request 166 with respect to the RLC status data 164 to regulate how many PDUs the RLC layer should transmit to the MAC layer 144. The RLC layer 142 then divides and combines the SDUs to generate PDUs 145 that conform to the TFC data request 166, and then sends all the PDUs 145 as a whole group 168 to the MAC layer 144. This completes the TFC selection required for transmission within TTI 162, while the TFC selection required for transmission within TTI 163 is completed within TTI 162. _ Unexpected data interruption may occur at any time, for example, between the time point when the RLC status data 164 is given to the MAC layer 144, and the time point when the entire group of PDUs 1 45 is given to the MAC layer 1 44. As far as the first embodiment is concerned, the unexpected data interruption may be caused by the SDU 141 discard event caused by the timer 133d timeout, the pause caused by the instruction issued by the third layer interface,

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Stop the f-reconstruction action or the reset action of the second-layer AM RLC itself. For example, ‘unexpected data interruption may occur at time point 169a (just before the TFC data request 166 appears) in FIG. 9 or at time point 1: 9b (> just after the TFC data request 1 μ appears). In any of the states' in case unexpected data interruption (occurs at time point 169a or 1691) causes the SDU data 141 in the IRLC ^ layer 142 to be insufficient to meet the data volume requirements in the TFC data request 166, the RLC layer 142 is constructed A significant number of blanked PDUs with the correct size to satisfy the requirements in TFC Data Request 166. For example, if at time 16 9b, a reconstruction command from the third layer interface 133 caused the SDU in the register 143 to be discarded or interrupted during transmission 'and the TFC issued by the MAC layer 166 The data request 166 requires 5 PDUs, each with a size of 220 octet, and the RLC will construct 5 blank PDUs, each with a size of 220 octets, and then the 5 pDUs A set of 168 is sent to the MAC layer to comply with the TFX data request 166. These five blank-fill PDUs replace the discarded or interrupted 1 4 1 due to unanticipated data interruption (occurring at time point 69b) caused by the reconstruction action. As another example, suppose that a discard event is triggered because the discard timer 3 3d expires, so that an SDU 141 is discarded. This event may cause the RLC layer 1 42 to be missing one PDU to satisfy a tfc data request 1 6 (requiring 8 p du u each of 150 octets in size). When the above assumptions occur, the RLC layer 142 can generate a fill-in pDu 150 to replace the PDU that is short because of the discarded SDU 141d, and then combine the fill-in PDU 150 with other normal data PDUs 145 into a whole group of 168. To meet TFC information request 166.

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As mentioned above, filling the blank PDU is used as a substitute for the PDU to fill the gap caused by the missing SDU data. However, besides filling the pDu, there are other forms of PDUs that can be used as replacements. For example, in the AM round, an irregular PDU with a reserved bit 154 of 1 can be used as a replacement PDU. In other words, the old pdu can be used as a replacement for PDU. The important point is that an appropriate number and size of PDUs must be transmitted to the MAC layer to satisfy the TFC data request.

In the second embodiment, when an unexpected data interruption occurs after the RLC entity message 1 64 is transmitted to the MAC layer 1 44, then under normal circumstances, the discarded or interrupted SDU should not be discarded or interrupted. , Wait until the start of the next TTI before discarding or interrupting.

Such unexpected data interruption may be caused by a pause, stop and rebuild action caused by a command issued by the third layer interface, or by a second layer AM RLC reset action. For example, if an am RLC reset occurs at time point 169a or 169b. Under normal circumstances, one am RLC reset action will cause all S D U data 1 41 and all p D U 1 4 5 to be immediately discarded. However, according to the method of the second embodiment of the present invention, regardless of whether the SDU 141 or the PDU 145 is discarded, the discarding action will be delayed to the next TTI (that is, TTI 162). Therefore, the RLC layer 142 will still have Sufficient SDU data 141 to satisfy the TFC data request. In case the data interruption occurs after the time point 1 6 8 (the entire group of PDUs is sent to the MAC layer 1 4 4) and before the RLC status data 1 70 in the next TTI is sent to the MAC layer 144, then because the RLC layer 142 and Not limited by RLC status data, either SDU 141 or PDU 1 4 5 can be discarded directly.

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V. Description of the invention (18) Compared with the prior art, the present invention ensures that the TFC data request is always maintained in a fulfilled state. One method is to fill in the blank PDU to replace the original PDU with data, and the other method is to delay the discarding or interruption of the SDU that should occur corresponding to an unexpected data interruption until the next ττΐ. By ensuring that the TFC requests are kept in a fulfilled state, unexpected software issues can be avoided 'and the stability of the wireless communication components can be improved. Although the present invention is disclosed as above with a preferred embodiment, it is not intended to limit the present invention, "any person skilled in the art" can do some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

200409510 Brief description of the diagram. Figure 1 is a block diagram of a three-layer communication architecture protocol; Figure 2 is a schematic diagram of the processing of the second layer of data transmission and reception; Figure 3 is a format block diagram of AM data ρου; Figure 4 is a Block diagram of the second layer interface 60; FIG. 5 is a timing diagram of a transmission period; FIG. 6 is a timing diagram of TFC selection in the prior art; and FIG. 7 is a block diagram of a wireless communication element 100 that implements the present invention FIG. 8a is a block diagram of an AM data blanking PDU 150; FIG. 8b is a block diagram of a UM data blanking PDU 150b; and FIG. 9 is a data transmission timing diagram according to the present invention. Explanation of symbols: 10 first station 20 second station 1 1 2 1 application message 1 2 22 3 3 4 3 third layer 1 2a 22a signal message 1 3 2 3 communication application

14 24 34 44 65a SDU

18 28 36 46 63 65b PDU 16 26 32 42 60 Layer 2 1 9 2 9 3 1 6 1 Layer 1 3 0 Transmitter

4 0 receiver 50 data PDU

0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 24 200409510 Brief description of the diagram 51 151a PDU format identification field 52 1 52a 152b Serial number field 53 1 53a Polling bit 54 1 54a Reserved bit 55a 55b 55c 155a 157a 155b 157b extension 56a 56b 156a 156b LI field

57a 57b 57c SDU 58 1 58a 158b Data area 62 RLC layer 64 MAC layer 6 5 Registers 7 4 Entire transmission block 7 4a Transmission block

75 RLC PDU 76 MAC header 72 8 1 8 2 8 3 Transmission period (TTI) 84 1 64 1 70 RLC status data 86 1 66 TFC data request 88 1 68 Entire transmission block 1 0 0 Wireless communication element 1 1 0 Processor 1 2 0 Memory 1 3 0 Code 131 First-level interface

0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 25 200409510 Simple illustration of the drawing 132 Second layer interface 133 Third layer interface 13 3d Discard timer 1 3 4 Application layer

141 141d SDU 142 RLC layer 143 register 144 MAC layer

145 PDU 150 Fill in blank PDU 150a AM Data PDU 150b UM Data PDU 1 6 9 a 1 6 9 b Time

0660-8832twf (nl); P-90060TW; EDWARD.ptd p.26

Claims (1)

200409510 1. In 7G wireless communication, an unexpected data interruption occurs in the transmission schedule between a wireless link control (RLC) layer and a media access control (MAC) layer Method, the unintended data interruption occurs after the RLC layer sends an RLC entity information to the MAC layer, and the processing method includes: corresponding to a data request sent by the MAC layer, the RLC layer passes to the MAC Tier 1 an appropriate number of proxy agreement data units (PDUs) to replace service data units (SDUs) that have been discarded or interrupted. 2. As claimed in the patent scope The processing method of item 1, wherein the unexpected data interruption is a time-out action, a reset action, a pause action, a stop action, or a reconstruction action due to a discard timer. 3 • The processing method of item 1 in the scope of patent application, wherein these substitute PDUs are blank PDUs. 4. A data scheduling method between a rlc layer and a MAC layer in a wireless communication element, the method includes: the RLC layer provides RLC status data to the MAC layer, and the RLC status data indicates the RLC The layer has an SDU waiting to be transmitted. After the RLC status data is provided, the RLC layer receives an unexpected data interruption and requests the RLC layer to discard or interrupt the data transmission of the SDU. After the unexpected data interruption occurs, respond RLC status information, the MAC layer sends a MAC request to request the RLC layer to provide at least one PDU; and 200409510 VI. The scope of the patent application layer corresponds to the AC request. The RLC layer transmits at least one generation of pj) u to the 〃 中 " Hai substitution is used to replace the discarded or interrupted. The method of item 4 of the patent scope, wherein the number of proxy PDUs is specific to the number of pDUs required by the MAC request. The method of item 4 in the range is expected, in which the unexpected resource is broken because of more than one action, a pause action, a stop action, or a heavy J action that occurred with a discard timer. Reset to fill 7 empty ptu application.方法 Method 4 of the patent scope, in which the substitute PDU is an 8 ·· wireless communication element with a program to process a MACiU-type processor between an RLC layer and the processor μ, an unexpected interruption in the data transmission schedule between the MAC layers. The unintended interruption occurs from the time period i ^ ^ ^ ^ ^ after the interruption occurs after the RLC layer provides the RLC entity to the MAC layer. The program performs the following steps: Corresponds to a stab sent by the MAC layer ^ Master +, _yAP «Buy it ▲ 60 Beco, please, let the RLC layer be passed to the unit, PDU) to replace the dismissal Hit early data · "Discard or discontinued service data unit (SDU) 〇9 · The application of the patent of the wireless communication element No. 8 of the monthly patent, where the unexpected data interruption is due to ~ Howl ”D Shibao ~ Action, -reset action, -pause of the time-out action. Section 7 action, a stop action, or a rebuild 10. 10. The substitute PDU such as the wireless communication of item 8 in the patent application is a blank PDU. Page 28 0660-8832twf (nl); P-90060TW; EDWARD.ptd 200409510 6. Scope of patent application11. A wireless communication element with a processor that executes a program that runs between an RLC layer and a MAC To schedule data transmission between layers, the program performs the following steps: causes the RLC layer to provide RLC status data to the MAC layer, the RLC status data table does not have an SDU waiting for transmission in the RLC layer, and provides the RLC status data Then, the RLC layer receives an unexpected data interruption, and requests the RLC layer to discard or interrupt the data transmission of the SDU. After the unexpected data interruption occurs, corresponding to the RLC status data, the MAC layer sends a MAC request to request the The RLC layer provides at least one PDU; and in response to a MAC request, the RLC layer transmits at least one generation of PDUs to the MAC layer; wherein, the replacement PDU is used to replace a discarded or interrupted sdu. 1 2. The wireless communication element according to item 11 of the patent application scope, wherein the number of substitute PDUs is equal to the number of pdus required by the MAC request. 1 3. If the wireless communication element according to item 11 of the patent application scope, wherein the unexpected data interruption is due to a time-out action, a reset action, a pause action, a stop action, or a discard timer, or It is a reconstruction operation. 14. The wireless communication element according to item η of the patent application scope, wherein at least one of P D U is substituted for p d 卩. 15. In the wireless communication element, a benefit line & ^, ^, ^ ^ 1 ink control (RLC) layer and a media access control (71 1 search Unexpected interruption of data transmission and transmission of private data to mecliuin access control (MAC) layer 0660 · 8832 twf (η 1); P-90060TW; EDWARD. P td p.29 200409510 Scope of patent application __ ~ i 理 ί ί 非 Ϊ :: The period data is not interrupted because the timer expires Expected-The interruption of the material occurs after the RLC layer is sent, (:: en: tlty lnformatl0n) is sent to the said layer, and the processor executes the packet. The delay corresponds to the interruption of the SDU by the unexpected resource until the rlc layer sends a PDU. In response, the MAC layer should send the RLC entity message. It is expected that an SDU should be discarded or a MAC request to the MAC layer should be requested. The MAC request is 16 · The processing method of item 5 in the scope of patent application, wherein the expected data interruption is due to a reset action, a pause action, an operation, or a reconstruction action. 7 Act 17. —A data scheduling method between a RLC layer and a MAc exhibition in a wireless communication component, the method includes: The RLC layer provides RLC status data to the MAC layer, and the RLC status The data indicates that the RLC layer has an SDU waiting to be transmitted; after the RLC-like carcinoma data was provided, 'the RLC layer received an unexpected data interruption, and the RLC layer was requested to discard or interrupt the SDU data transmission,' and The unexpected data interruption is not triggered by a discard timer expiration; after the unexpected data interruption occurs, corresponding to the RLC status data, The MAC layer sends a MAC request requesting the RLC layer to provide at least one pDU; and in response to the MAC request, the RLC layer sends at least one PDU to the MAC layer; after the RLC layer sends at least one PDU to the MAC layer, There should be an unexpected data interruption, and the RLC layer discards SDUs that have not been transmitted to the MAC layer. 0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 30 200409510 VI. Patent Application ^-1 8 · As the method of applying for Patent Item No. 丨 7, wherein, at least one PDU is transmitted after the MAC layer In response, the RLC layer should discard all remaining ones that are not pre-empted at the RLC layer. The peak data is interrupted. 19. For the method in the 17th scope of the patent application, the data interruption is due to a reset action, a pause action, a ^ or a reconstruction action. Τ 20. The method according to item " of the scope of patent application, wherein the number of PDUs transmitted from the RLC layer to the MAC layer is equal to the number of pDUs required by the MAc request. 0660-88321wf (η 1); P-90060TW; EDWARD.ptd page 31