TWI220829B - 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 technical field to which the invention belongs · The f invention relates to a processing method for processing unintended interruptions in the transmission of wireless communication data; especially in the radio link control (RLC) layer and media access Control

Access control (MAC) layer interruption schedule control. Prior art 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 13 in the first station 10 generates an _ application message 11 and delivers the application message 11 to a third layer interface 丨 2 to transmit the application message 11 to the second station 20. The third layer interface 12 can also generate a third layer signal message 12a for controlling the third layer operation between the first station 10 and the second station. For example, the third layer signal message 12a may be a request for a secret recording switch. The secret recording switching request may be generated individually by the third-layer interfaces 12 and 22 of the first station 10 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 φ layer interface 12 wants to deliver to the second station 20, and such data may be a signal message 12a or an 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

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The second side 19 ^ The first layer interface 19 is the physical layer. The negative shell transports the shell material to the second station 20. The transmitted data is received at the first layer interface 29 of the second station 20, then reassembled into one or more PDUs, and then uploaded to the second layer interface 26. The second layer interface 26 receives the pDU, and then reassembles P ^ DU into one or more second layer S]) U, and then uploads it to the second layer interface 22. Next, the third layer interface 22 converts the received s ^ u, and returns it to an application message 21 or a signal message 22a. This message theory should follow the first layer The original application message appears]] or # 号 信息 1 2a-the same. If it is the application message 21, it will be delivered to the communication application 23 in the younger station 20 for processing. Here, the common communication nomenclature is the definition used in this article. PDU refers to a unit of data transmitted between a certain layer and its lower layer, and S D U 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 "PDUn" refers to the second-layer PDU (that is, the first-layer SDU). The second layer interface that plays the role of buffer between the third layer (responsible for higher layer data transmission and reception) and the first layer (responsible for lower layer entity transmission and reception). Please refer to Figure 2, which is the second layer Layer data transmission and reception processing diagram. A transmitter 30 (may be a base station or a mobile terminal) second layer interface 32 receives a series of SDU 34 from the third layer interface 33. It is assumed here that The sizes of 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 SDU 34 into a string of pdu 36. This string of PDUs is assumed to be numbered from 1 to 4 and every

1220829 5. Description of the invention (3) " P D U have the same length. This string p]) u 3 6 is sent to the first layer interface 31, 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 wireless communication environment with a lot of noise, 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 the discard timer of an SDU exceeds the timeout (timeout), the SDU and related PDUs are discarded together. 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, it is an obvious challenge to ensure the need for the second acoustic interface 42 to sequentially send the SDU 44 to the third layer interface 43. The difference is that the "sequential" delivery mode is not required (that is, the system does not require SDU 44 to be passed upwards in sequence). Before the relevant pDU has been received correctly, any incomplete SDU 44 is also Not before

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Send. Wireless communication protocols are very carefully designed to face such problems. Generally speaking, there are two common modes for transmitting and receiving data: acknowledged mode (AM) and unacknowledged mode (UM) transmission. For AM data, access

The receiver 40 sends a specific Layer 2 acknowledgment signal to the transmitter 30 to inform that the Layer 2 PDU has been successfully received. The transmitter 30 can then retransmit AM PDUs that were not successfully received to ensure that the receiver 40 can correctly receive all PDUs. There is no such confirmation signal in the UM mode. Therefore, 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, it goes without saying that UM data can also be used with 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 PM: control PDU and data PDU. 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 12a 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 1 2 a and 2 2 a, 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.

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Interface 22. PDU 50 in Figure 3 is a piece of information ρ]) 1 ’/: cut into many shelves (ne

PDU grid, identification column & only has a single n to indicate whether this is just a data PDU or a control pDU. If the value in the field is i, this p⑽M is a shell PDU. The second field is a sequence number (SN) stop 5 2. At the time of AM transmission, this block is 12 bits long. Subsequent p du 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 536 is transmitted, the next P D U should carry a serial number 5 37, and so on. A retransmitted p j) u may carry a sequence number 535, which indicates that the PDU should be inserted before the PDU with a sequence number 536. Although, in real time, pDu with serial number 535 is received later than serial number 536. However, according to the sequence number of the received pdu, 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 D U received earlier. Take advantage of this

This method can achieve the purpose of data retransmission. 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 an acknowledgement 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

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(length indicator, LI) ° LI has either 7 bits or 15

Bits; used to indicate the end position of a second layer SDU in the second layer pDU 50. If a single SDU alone completely fills the data area 58 'of the PDU 50, the bit 553 should be 0, indicating that there is no 1 ^ 1 field in [) 1) 11. In the example in Figure 3, the pdu 50 has two second-layer SDu 57a and 57b ends in the second-layer PDU 50. Therefore, there are two LIs to indicate the end of the second layer SDU 5 7a and 57b, respectively. Then the subsequent pDU of this PDU 50 (different by serial number) may have a LI to indicate the end of SDU 57c. The extended bit 55b after LL is set to 1, which means that there is a subsequent LI (just Lb on the figure). The extension bit 55c next to Lb is set to (^, which means that there is no LI in the future, and the data area 58 starts immediately after this extension bit 55c. The data area 58 is used to place the actual data.

Please refer to Figure 4 and Figure 5. Figure 4 is a detailed block diagram of a second layer interface; Figure 5 is a time diagram of several transmission time intervals (TTI) 72. The second layer interface 60 has a radio link control (radio Hnk cnntrc> 1, RLC) layer 62, which is located above the medium access control (MAC) layer 64 and is interconnected with the MAC layer 64 . This arrangement can be known from the conventional 3GPI-TS 25 · 321 ν3 · 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 (RLC layer or higher), many communication channels have been established, and each communication channel Biography from °! parameter. In terms of functionality, these communication channels must form a single stream to be presented to the first-level interface of the entity.

1220829 V. Description of Invention (7) 61. This is one of the main purposes of the MAC layer 64. The MAC layer 64 allocates a transmission period ′ to each pdu 63 handed down by each RLC entity 62 and places it in a series of TTIs for transmission. For a communication channel, the time length of the parent T T I 7 2 is the same, for example, 20 ms. However, the TTI of different communication channels may have different time lengths. That is to say, corresponding to different RLC entities, TTI may have different time lengths. Although there may be many communication channels when Beiji's communication is in operation, it is assumed in the discussion in Chongqing that there is only one communication channel, that is, there is only one RLC layer entity 6 2 to facilitate explanation. In each time length of ττ! 72, the MAC layer 64 sends a whole set of 74 transmission blocks (tranSp0rt 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 PDU 75 ′ and a mac header 76 with or without it.

Depends on the nature of the news channel. In a TTI, all RLC PDUs 75 (or transport blocks 74a) have the same length. The number of RLC pDu 75 in a whole group of 74, or the number of transmission blocks 7 4a in a whole group of 74, may vary from TT I 72. For example, in Figure 5, the first TTI 72 transmits 6 PDUs 75, and the next TTI 72 transmits 3 PDUs 75. The actual PDU data size may also vary with the TTI, but it must be the same in the same TTI. Therefore, before each ττ I transmits the entire set of transmission blocks, the MAC layer 64 needs to inform the RLC layer 62 that in 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 secure data transmission traffic from the RLC layer 62 to the MAC layer 64. TFC chooses to enable MAC

0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 12 1220829 V. Description of the invention (8) Layer 64 can generate an efficient bit string data to the first according to the different needs of each RLC layer entity 62. One layer of physical interface 61. According to the result of the TFC selection, the SDU 65a is first stored in the temporary register 65, and then divided and reassembled by the RLC layer 62 into the PDu 65b of the size required by the TFC selection. Then the RLC layer 62 delivers the number and size of the TFC selection requirements pdu to MAC layer 64. As mentioned before, the MAC layer 64 will add a MAC header 76 before 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 group of 74 transmission blocks 74a is sent to the first layer interface 61 of the entity to be sent out. See 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 the SDU 65a in a TTI, the TFC selection of the TTI 82 must be completed in the previous TTI (that is, τη 81). In TTI 81, the RLC layer 62 needs to inform the MAC layer 64 about the RLC entity information 84. The RLC status data 84 allows 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 status data 84, the MAC layer 64 responds to the RLC layer 62—TFC data request 86 ° The TFC data request 86 instructs the RLC layer 62 to transmit the size and number of PDUs 6 5b to the MAC layer 64. The above-mentioned number of generation data requests 86 * PM may not be enough to cover all SM 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 86 is sufficient to include all the SM data 65a, the RLC layer 62 composes an appropriate number of SDU data 65a into the required size P D U 6 5 b according to the TFC data request 86 ′. These p d υ β 5 b are then delivered as a whole set of 8 8

Page 13 0660-8832twf (nl); P-90060TW; EDWARD.ptd 1220829 V. Description of the invention (9) To the MAC layer 64. In TTI 82, the MAC layer 64 processes the entire group of 88 PDUs 65b, and then sends it to the first layer interface 61. In TTI 82, T T I selection is also performed again for the data transmission of TTI 8 3 '. The SDU data 65a combined into p d U 65b is removed from the register 65. SDU 65a may also be removed from the register 65 due to timeout. Each SDU 65a has a validity period (exp i rat ion

t i me) and is tracked by a drop 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. Such an event may also occur after (^ (: layer 62 sends RLC status data 84), causing the number of SDU 65a to be transmitted actually owned by RLC layer 62

Less than described for R L C-shaped negative material 8 4. However, once the M A υ layer 64 responds-after the TFC lean request 86, the RLC layer 62 must transmit a pDu of the size and quantity required by the TFX data request 86. Failure to do so will result in a software error for the wireless communication component. This problem has been encountered in the previous technical name, and it is very important for the scheduling of data transmission. In the first Θ technology, if the RLC layer 62 informs the MAC layer 64 that SDu 65a is ready to be transmitted, and one SD U 6 5a has timed out, the actual discard action will be delayed to the next TTI. get on. With this method, the RLC layer 62 can ensure that there are enough SDUs to form a whole group of 88 PDUs. in

If the HFI2 I timed out SDU is not in the whole of the TTI 82 scheduled transmission, it can be discarded before the TFC selection made for TTI 83 without delaying the discarding action.

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However, in addition to the above-mentioned conditions, there are other unexpected capital conditions that have not been considered in the prior art. Please go back to Figure 丨 and / according to Figure 4 and Figure 6. Most of the unexpected data interruptions are commands (common primitives) from the third interface 3 to the first layer interface 16 ^

Cause. Therefore, from the perspective of the RLC layer 62, those interruptions are unexpected. These interrupts include stop A (stoop), suspend (suspend), and r * e-establish instructions. In addition, the reset event of the second layer is also a cause of unexpected data interruption. When The third-level interface must switch to the base station. The third-level interface 12 has initiated a command to stop production and transmission of the second-level interface 16. The stop command requires the second-level interface 12 to immediately stop the transmission of the SDU lean 65a. Therefore, even if the TFC data request has been received, the PDU 6 5b must be withdrawn from the state of the sMAC layer to be sent and stopped. The rebuilding action is initiated by the third layer interface 2 and the third layer interface 12 will issue a The rebuild command goes 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, the MAC layer 64 may stay at a TFC data request is not fulfilled. When the third one, 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. Pause Order to be sent from the third-level interface 丨 2 to the second-level interface 16 in a manner with a parameter η. This parameter η specifies that the second-level interface 16 will stop transmitting data after η PM 65b is subsequently sent. This The purpose of the parameter η is to provide sufficient time t (calculated in PDUs), so that the procedure of the redundant synchronization between the first station 10 and the second station 20 can be completed. Generally, if η is large enough, the RLC layer 62 will be sufficient

1220829 V. Explanation of the invention (11) Sufficient warning time to pre-empt the advanced communication, and θ can be prepared without causing a small TFC data request from time to time. The RLC layer 62 may have to withdraw the pending PDU 65b, As a result, the TFC master +, ^ w ^ 优 仟 贝 枓 has not been met for a month. The last explanation is η: When a communication channel detects a communication error, the 12-layer interface 16 ^ performs a reset operation. In essence, delaying some communication errors is an unexpected reset action. The reset action will cause all state variables (state, = ^ le) and all registers stored in all registers of a corresponding communication channel to be divided by h or set to a preset value. Therefore, the SDU 65a or PDU 65b will be removed during the reset. Therefore, it is possible that the MAC layer 64 stays 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 an unintended transmission interruption between an rlc sound and a MAC layer in a wireless communication system. According to the above object, the present invention provides a method and system for processing unexpected data in a transmission schedule between an RLC layer and a MAC layer in a wireless communication element. The RLC layer provides RLC entity information to the MAC layer. The RLC entity message indicates that the RLC layer has an SDU waiting to be transmitted. After presenting the RLC entity message, the RLC layer received an unexpected data interruption, and requested the RLC layer to give up or interrupt the transmission of the SDU. In response to the information of the RLC entity, the MAC sends a MAC request, requesting that the RLC layer send at least two PDUs. In response to the MAC request, the RLC layer sends at least one * PDU 'to the MAC layer to replace the discarded SDU. Another option is to discard

0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 16 1220829 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 and provides sufficient data to the MAC layer, thus avoiding the danger of software instability. 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 to describe in detail as follows: Embodiment: In the following description, a transmitter or The receiver may be a cellular telephone, a personal digital assistant (PDA), a personal computer (PC), or any other component using a wireless communications protocol. The present invention can be applied to wireless communication protocols or other wireless systems discussed in the present 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 component 100 includes a processor 110 and a memory 1 2 0. § The memory 12 stores a program code 130 to be executed by the processor 110. Of course, the wireless communication element 100 also requires many other elements known to those skilled in the art. It's just that = other elements are not relevant to the present invention, so they are omitted in this description. The program code 1 3 0 is used to implement the wireless communication protocol. This communication protocol includes an application layer 134, a third layer interface 133, a

0660-8832twf (nl); P-90060TW; EDWARD.ptd '17th stomach " ------- 1220829 V. Description of the invention (13) The 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. No matter how the invention is implemented, the main focus of the invention is on the wireless communication protocol itself, especially the part of the second layer interface 1 2 2.

The second 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 142 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 1 to 45 transmitted to the MAC layer 1 44 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 cause the RLC layer 1 42 to provide at least one padding PDU 150 to satisfy the TFC data request generated by the MAC layer 144. This blank pm 150 does not carry the real SM data 141, and is only used when the SDU data 141 is discarded because of unexpected data interruption. Please refer to FIG. 8a, which is a detailed block diagram of a blank PDU 150. 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 15a is set to 1. The serial number block 52a is a standard serial number, and the & query bit 153a may be 0 or 1 (defined by the second layer interface 132 according to the polling status). Field 154a is reserved and its value is set to zero. Followed by extension bit 15. The total 疋 is set to 1 'to indicate that it is immediately followed by Li 156a. However, a special code is set in LI 1 5 6 a, 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 the RLC entity, in fact, the length occupied by li 156a may be 7 bits or 15 bits. In Figure 8a, the LI length is 5 bits. This special LI 1 56a means that the remaining undefined parts of the PDU 1 50a are just filled in, 'all there is only a v can be ignored' undefined message. 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 'is for filling the position. It should be noted that, under UM transmission, the UM data PDU format is used as the blank PDU. Fig. 8b is a block diagram of a UM data filling blank PDU 150b. Relatively speaking, the jjM data filling blank PDU 1 50b is much simpler in structure. There is a seven-bit length serial number block 152b, followed by an extended bit 155b (set to 1), and then all set The seven-bit length of LI 1 5 6b (indicating that the following data is a blank fill), and a final extension bit set to 0, 5 7b (indicating that there is no LI afterwards). The actual bit length of LI 1 56b is determined by the maximum UMD PDU size in the UM RLC entity defined by upper layer 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

0660-8832twf (η1); P-90060TW; EDWARD · ptd Page 19 1220829 V. Description of the invention (15) 1 5 8 b is undefined and can be put in any value. The preferred embodiment uses blank-filled PDUs (the AM RLC entity uses PDU 1 50a and the UM RLC entity uses pDU i50b) 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 from 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 144 determines a series of equal length TTIs for the RLC layer 142. In order for data to be transmitted during the TTI 162 period, the TFC selection of the data schedule must be completed in the previous TTI 161. To initiate a TFC selection, the RLC layer 142 sends RLC status data 164 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 some time, the MAC layer 144 responds to a TFC data request 166 with respect to the RLC status data 164 to regulate how much and how much pDu 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, and the TFC selection required for transmission within TTI 163 is completed within TTI 162. Unexpected data outages can happen at any time, for example, at

The time point when the RLC status data 1 64 is given to the MAC layer 1 44 and the time point when the entire group of 68 PDU 1 45 is given to the MAC layer 1 44. As far as the first embodiment is concerned, the unexpected data interruption may be due to the SDlJ U1 discard event caused by the timer l33d timeout, the pause caused by the instruction issued by the second-level interface,

0660-8832twf (η1); P-90060TW; EDWARD.ptd Page 20 1220829 V. Description of the invention (16) Stop or rebuild action, or reset action of the second layer AM RLC itself. For example, the unexpected data interruption may occur at the time point 169a (just before the T F C data request 166 appears) in Figure 9 or the time point 169b (just after the TFC data request 166 appears). In any state, in case unexpected data interruption (occurs at time point 169a or 169b) caused SDU data 141 in RLC layer 142 to be insufficient to meet the data volume requirement in TFC data request 166, RLC layer 142 will be constructed Number of blank PDUs of the correct size to satisfy the requirements in TFC Data Request 16.6. For example,

If at day 169b 'a reconstruction command from the third layer interface 133 causes the SDU in the register 143 to be discarded or interrupted during transmission, and the TFC data request is sent by the MAC layer 166 166 requires 5 PDUs, each with a size of 220 octet, then the RLC will construct 5 blank PDUs' each with a size of 220 octets, and then these 5 pj) u A set of 168 was sent to the MAC layer to comply! ^ Data Request 166 / These five blank PDUs replaced the unexpected data interruption (occurred at time point 1 69b) caused by the reconstruction action and was Discarded or interrupted SDu 141. As another example, suppose that a discard event is triggered because the discard timer 133d expires, so that an SDU 141 is discarded. This event may cause the RLC layer 142 to be short of a pDu to satisfy a TFC data request 166 (requires 8 pDUs each with a size of 150 octets). When the above assumptions occur, the RLC layer 142 can generate a blank PDU 150 to replace the pj which is short because of the discarded SDU 1 4 1 d. U, after the iron will fill * ρ ρ u 150 and other normal data PDUs 145 together, becoming `` a whole set of 168 to satisfy TFC data request 166.

1220829 V. Description of the invention (17) As mentioned above, filling the blank PDU is used as a replacement for the PDU to fill the gap caused by the missing SDU data. However, in addition to filling in blank PDUs, 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 also be used as a replacement for the previously transmitted 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 the suspension, stop and re-establishment actions caused by the order issued by the third layer interface, or the second layer AM RLC reset action. For example, suppose that a one-dollar RLC reset action occurs at time point 169a or 169b. Under normal circumstances, an AM RLC reset will cause all SDU data 141 and all pDU 145 to be immediately discarded. However, according to the method of the second embodiment of the present invention, whether it is discarding SDU 141 or discarding PDU 145 ', the discarding action is delayed: one m (that is, m 162). Therefore, the RLC layer 142 is white SDU. Document 141 to satisfy the TFC document request. Thousands—The data interruption occurred at the time point 1 6 8 (the entire set of P D U is sent to the M A C layer 1 4 4) Even you are stupid, and the RLC status data 170 that occurred in the next TTI is sent to M AΓ

Before layer 144, then because the RT layer 142 is not limited by the RLC status data, τ from ... ^ KL, no matter SDU 141 or PDU 145 can be discarded directly. 1 ^ 疋

1220829 V. Inventive Training (18) " '—

Compared with the prior art, the present invention ensures that TFC data requests are always maintained in a fulfilled state. One method is to fill in the blank PDUs: * There are times. The other method is to delay corresponding to unexpected data: so mSDU is discarded or interrupted 'until the next m. By ensuring that the TFC stays in a satisfied state, unexpected software problems can be avoided to 'improve the stability of wireless communication components. Although the present invention is disclosed as above with a preferred embodiment, it is not intended to limit the ^ invention' Anyone skilled in this art will not deviate from the spirit and scope of the present invention: a few changes and improvements. Therefore, the scope of protection of the present invention shall be determined by the scope of the attached patent application.

1220829 Brief description of the diagram. The first diagram is a block diagram of a three-layer communication architecture protocol. The second diagram is a schematic diagram of the processing of the second layer data transmission and reception. The third diagram is a format block diagram of an AM data PDU. The fourth diagram 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 device 100 that implements one of 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 timing diagram of data transmission according to the present invention. Explanation of symbols: 10 first station 20 second station 11 2 1 application message 1 2 22 3 3 4 3 third layer 1 2 a 2 2 a signal message 1 3 2 3 communication application

14 24 34 44 65a SDU

18 28 36 46 63 65b PDU 1 6 26 3 2 4 2 6 0 second layer 1 9 29 3 1 6 1 first layer 3 0 transmitter 40 receiver

50 data PDU

0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 24 1220829 Brief description of the diagram 51 151a PDU format identification field 52 1 52a 152b Serial number field 53 153a Polling bit 54 154a 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 74a Transmission block

75 RLC PDU 76 MAC header 72 8 1 8 2 8 3 Transmission period (TTI) 84 164 170 RLC status data 86 1 66 TFC data request 8 8 1 6 8 The entire transmission block I 0 0 wireless communication element II 0 processing 1 2 0 memory 1 3 0 code 131 first layer interface

0660-8832twf (nl); P-90060TW; EDWARD.ptd Page 25 1220829 Simple explanation of drawings 132 Second layer interface 133 Third layer interface 13 3d discard timer 1 3 4 Application layer

141 141d SDU 142 RLC layer 1 4 3 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)

1220829 ea Amendment No. 91134287 VI. Application Patent Scope 1. A processing method used in wireless communication components, a radio link control (RLC) layer and a medium access control system (medium access control, The transmission schedule between the MAC) layers is expected ~ When the data is interrupted, the unexpected data interruption occurs at the Rlc layer. Sending the RLC entity information to the MAC management method includes: A data request sent by the layer, the RLC layer is a weak MAC layer, a suitable number of proxy protocol data units (pr0c0i datf unit, PDU) to replace the discarded or interrupted service data unit service data unit (SDU) ° 2 · As for the processing method of item i in the scope of patent application, wherein the data interruption in this period is an overtime action, a reset action, a pause action, and a stop due to a discard timer Action, or a reconstruction action. 3. The processing method of item 1 in the scope of patent application, wherein the PDU used is a blank PDU. " η 4 · A method used in a wireless communication element, when scheduling data between an RL [layer and the MAC layer, the method includes: "The RLC layer provides RLC status data to the MAC layer, The RLC status data indicates that the RLC layer has an SDU waiting to be transmitted; "" After the RLC status data is provided, the RLC layer receives an unexpected data, and requests that the RLC layer discard or interrupt the data transfer 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 1 ^ (: layer to provide at least one PDU; and 0660-88321wf1 (η1); P-90060TW; EDWARD Page 27 1220829 J Wuzheng Substitute PDlJ to this MAC case number 91134 slave 7 6. Apply for special brake range In response to the MAC request, the rlC layer transmits at least one layer; the broken SDU. ’Among the substitute PDUs, the substitute PDU is used to replace the discarded or discontinued 5 · As in the method of patent application No. 4, the number is equal to the number of pDu required by the MAC request. 6. The method according to item 4 of the scope of patent application, wherein the material interruption is due to an overtime action due to a discard timer ^ unexpected asset action, a pause action, a stop action, or a reconstruction you Set 7 · If the method of the scope of patent application No. 4, it. Less Fill in the blank PDU. μ Substitute PDU system 8 · — wireless communication components, and has a 4 ^ γ 4 ♦ π 8 μ 〇τ. /, a private processor of the track type, the% formula is based on the -RLC layer and- __Unexpected data interruption in the data transmission schedule between the MAC layers. The unexpected data φ age: Christine 4 + ^ Beam interruption occurred after the RLC layer provided the RLC entity information to the MAC layer. The program performs the following steps; To the MAC layer, the data request is sent to the ⑽MAC layer to pass an appropriate number of proxy protocol data units (pr〇t〇c〇i yn it PDU) to the ^ MAC layer to replace the dropped or being Interrupted service data unit (SDU) 〇9. As stated in the wireless communication element of the patent scope item 8, wherein the unexpected data interruption is due to a timeout due to a discard timer =,-heavy Set the action, a pause action, a stop action, or a rebuild action. 10. The wireless communication element according to item 8 of the patent application scope, wherein the special substitute PDU is a blank pd U. 1220829 "Legislative" case number 91134287 VI. Patent application domain w 1 1 · A wireless communication element with a processor that executes a program, and two private execution of data transmission between an RLC layer and a MAc layer The program performs the following steps: The RLC layer provides RLC status data to the MAc layer. The Rlc status data indicates that the RLC layer has an SDU waiting to be transmitted. A * After the RLC status data is provided, the RLC layer Received an unpredictable data interrupt, and requested the RLC layer to discard or interrupt the data transmission of the SDU. After the unexpected data interruption occurred, corresponding to the RLC status data, the MAC layer developed a MAC request and requested the existing data. The layer provides at least one pDU, and in response to a MAC request, the RLC layer transmits at least one generation to reach the said layer; "UU substitute PDU" is used to replace the dropped or interrupted §Jane. II.12. Such as The number of patented wireless communication elements in the 11th scope of the patent application is equal to the number of pDu required by the MAC request. 13. If the wireless communication elements in the uth scope of the patent application are applied, it is = pre = data interruption due to An overrun that occurs with a discard timer. ^ Stop action, < is a reconstruction 14. As in the patent application scope, the wireless communication element and at least one of the substitute PDUs is filled in blank pDu. ',, 1 5 · — a kind of processing used in wireless communication components, inter-radio link control (RLC) layer and' one-two wireless system (medium access control (MAC) layer), value, sub-control < Transmission Schedule Occurs 0660-8832twfl (nl); P-90060TW; EDWARD.ptc End of page 29 Unexpected data interruption is not due to a day-to-day grabber entity message (enti tr infm material interruption occurred at the RLC layer The method of sending RLC includes : Lni〇rmati〇n) to the MAC layer, the process is to discard the SDU or pDn should occur in the period of data interruption should not occur until the RLC layer sends to the MAC layer a required number of 'In response to the comfort request sent by the MAC layer, it should respond to the RLC entity message. ^ 糸 Pair 1 6 · The processing method of item 15 in the scope of patent application, wherein the non-Phase 2 data interruption is due to a reset action, a pause action, a stop action, or a reconstruction action. Guo 17 · —A method used in wireless communication components. When scheduling data between an RLC layer and a MAC layer, the method includes: The RLC layer provides RLC status data to the MAC layer, and the RLC The status data indicates that the RLC layer has an SDU waiting to be transmitted; after the RLC status data is provided, the RLC layer receives an unexpected data interruption, requests the RLC layer to discard or interrupt the data transmission of the SDU, and the unexpected data The interruption is not triggered by a discard timer timeout; after the unexpected data interruption occurs, corresponding to the RLC status data, the MAC layer sends a MAC request to request the RLC layer to provide at least one PDU; and in response to the MAC request, the The RLC layer sends at least one PDU to the MAC layer; and after the RLC layer sends at least one PDU to the MAC layer, 0660-8832twfl (nl); P-90060TW; EDWARD.ptc page 30 Expected in m: the RLf layer discards _ that has not been transmitted to the MAC layer. __Modify_ Send to // 丨, a ρΐ) ° ϋ ^ * method around item 17, where the RLC layer is dedicated to y PDUs to sMA (: after the layer 'should correspond to unexpected data interruptions, Zu c Layer discards all surviving _ .. Beco interrupt, 1 9 · If the method of patent application No. J 7 is used, the data interruption is because of a reset action, a pause action, a public expectation, or a reconstruction action. Action, 20 · If the number of PDUs transmitted to the MAC layer by the party applying for item 7 of the patent scope is equal to, MA (: to the next two, from the RL (: layer item. Inch%) Obtain the required number of PDUs 0660-8832twfl (nl); P-90060TW; EDWARD.ptc page 31