TWI590609B - Method of handling communication operation in communication system and related apparatus - Google Patents

Description

Method for processing communication operation in communication system and related equipment

The present disclosure relates to a method of processing communication operations in a communication system and related devices.

The 3rd Generation Partnership Project (3GPP) Rel-8 standard and/or the 3GPP Rel-9 standard long-term evolution (LTE) communication system has been developed as a universal mobile communication system ( The successor of the universal mobile telecommunications system (UMTS) to further enhance the performance of UMTS and meet the increased demands of users. The LTE system will include an improved radio interface and an improved radio network architecture to provide high data rates, low latency, packet optimization, improved system capacity, and improved coverage relative to the predecessor.

1 illustrates a typical LTE system 100, referred to as an evolved Terrestrial Radio Access Network (evolved Terrestrial Radio Access Network, E-UTRAN) Radio Access Network (RAN) will contain one or more evolved Node Bs (evolved Node-B) for communicating with one or more user equipment (UE) 102 , eNB) 101. The E-UTRAN can be used with the core network 103 including the Mobility Management Entity (MME) 104, the Serving Gateway (S-GW) 105, etc. for the non-access layer (Non Access Stratum, NAS). ) Controlled communication.

The LTE communication system currently has at least two available duplex mechanisms, which will include a frequency-division duplexing (FDD) mechanism and a time-division duplexing (TDD) mechanism. When FDD is implemented, the UE will be able to transmit and receive signals simultaneously on different carriers. When implementing TDD, the UE will be able to separate uplink and downlink transmissions in different time slots. In addition, TDD systems can provide flexible resource utilization through different TDD configurations.

Figure 2 illustrates seven different uplink/downlink (UL/DL) configurations currently implemented by an LTE communication system. Based on the flow characteristics, a different DL:UL ratio between 2:3 and 9:1 can be selected (as shown in Figure 2). In detail, any "U" (for example, 201) indicates that the subframe is a UL subframe for transmitting UL data, and any "D" (for example, 202) indicates that the subframe is used for transmitting DL. The DL sub-frame of the data, and any "S" (eg, 203) indicates that the sub-frame is a special sub-frame for transmitting control information and possibly data (depending on the configuration of the special sub-frame).

FIG. 3A illustrates a typical downlink subframe 300 of an LTE communication system. The downlink subframe 300 may include a physical downlink control channel (physical) The downlink control channel (PDCCH) 301 and the physical downlink shared channel (PDSCH) 303. The PDSCH 303 is a data bearer channel assigned to a specific user. Downlink control information (DCI) 302 allocated within PDCCH 301 may indicate a downlink assignment. When the UE detects the downlink assignment in the subframe, the UE will receive the corresponding PDSCH in the same subframe. In general, the PDSCH is typically scheduled by a downlink assignment in the same subframe (as shown in Figure 3B).

The DCI 302 may indicate downlink resources in the PDSCH 303 to schedule downlink resources for hybrid automatic repeat request (HARQ) procedures. DCI 302 may comprise an indication of downlink hybrid automatic repeat request (DL HARQ) program number field, wherein the maximum number of DL HARQ related program shown in FIG. _4A (M DL_HARQ). As can be seen in Figure 4A, (per carrier) M _{DL_HARQ} will be related to TDD/FDD duplex settings and/or TDD configuration operated by the communication device. For example, for FDD carrier 401, M _{DL_HARQ} 402 will typically be set to 8. For TDD carriers 403 with UL/DL configurations 0, 1, 2, 3, 4, 5, and 6, M _{DL_HARQ} 402 will be set to 4, 7, 10, 9, 12, 15, and 6, respectively. Therefore, according to the UL/DL configuration, for the FDD carrier 401, 3 bits in the DCI are required to represent a maximum of 8 HARQ programs, and for the TDD carrier 403, 4 bits in the DCI are required to represent multiple maximums of the HARQ program. number.

4B is a flow chart illustrating a current LTE HARQ retransmission procedure. In step S411a, the base station transmits the first transmission in the first subframe via the serving cell. In step S411b, the UE will pass The first transmission is received by the serving cell in the first subframe. In step S412, the UE will decode the first transmission. In step S413a, the UE will transmit an acknowledgment (ACK) or a negative acknowledgment (NACK) in the second subframe, wherein the acknowledgement or negative acknowledgement (ACK/NACK) corresponds to the decoding result. In step S413b, the base station will receive an ACK or NACK corresponding to the first transmission in the second subframe. In step S414a, the base station will transmit a second transmission in the third subframe via the serving cell, wherein the second transmission is a retransmission of the first transmission. In step S414b, the UE will receive the second transmission in the third subframe via the serving cell, wherein the second transmission is a retransmission of the first transmission. For the current LTE HARQ retransmission procedure, when the first transmission is transmitted in the serving cell, the second transmission will also be transmitted in the same serving cell.

FIG. 5A illustrates an example of a HARQ program in FDD mode. In general, up to 8 DL HARQ programs or M _{DL_HARQ} = 8 are supported in a conventional FDD system. In FIG. 5A, each of P0 to P7 represents each of 8 DL HARQ programs, respectively. The number of DL programs is indicated by the field "HARQ number" in the DCI, which is 3 bit fields for FDD and 4 bit fields for TDD. Referring to FIG. 5A, in step S501, assuming that the UE receives the first transmission of the DL HARQ procedure p0 in the subframe index 0, the UE transmits the first transmission phase with the DL HARQ procedure p0 when the subframe index is 4. Corresponding ACK/NACK. In step S502, assuming that the UE transmits a NACK corresponding to the first transmission of the DL HARQ procedure p0 in the subframe index 4, the UE may receive the DL HARQ procedure p0 in the subframe index 8 in step S503. Retransmission, where the first transmission and retransmission are received on the same serving cell.

In FIG. 5A, the UE may receive up to 8 DL HARQ procedures (P0 to P7) during the time between the first transmission and the retransmission. Thus, in the conventional FDD system, the maximum number of DL HARQ process is ₈ (M DL_HARQ = 8).

5B and 5C illustrate examples of HARQ programs in TDD mode UL/DL configuration 0 and in TDD mode UL/DL configuration 5, respectively. M _{DL_HARQ is} related to its UL/DL configuration. In FIG. 5B, the P0 to P3 numbers indicate each DL HARQ program when the maximum number of DL HARQ programs in the TDD mode UL/DL configuration 0 is 4; and in FIG. 5C, the number of P0 to P14 indicates in TDD UL The maximum number of DL HARQ programs in /DL configuration 5 is 15. In step S511, it is assumed that the UE receives the first transmission of the DL HARQ program p0 in the subframe index 0 of the radio frame m. In step S512, when the subframe index is 4, the UE transmits a NACK corresponding to the first transmission of the DL HARQ procedure p0 in the subframe configured for the uplink. However, the four subframes after the subframe index 4 are not the downlink subframes, so in step S513, the UE receives the retransmission of the DL HARQ program p0 in the subframe index 0 of the frame m+1. The first transmission and retransmission are received on the same serving cell.

In FIG. 5B, the UE may receive up to 4 DL HARQ procedures (P0 to P3) during the time between the first transmission and the retransmission. Thus, if the UL / DL configuration is 0, then the conventional TDD system the maximum number of DL HARQ procedure is ₄ (M DL_HARQ = 4).

Regarding the example shown in FIG. 5C, in step S521, it is assumed that the UE is The first transmission of the DL HARQ program p0 is received in the subframe 0 of the frame m. However, the four subframes after the subframe index 0 are not uplink subframes, so in step S522, the UE is in the next available uplink subframe (subframe index 2 of frame m+1). A NACK corresponding to the first transmission of the DL HARQ program p0 is transmitted. In step S523, the UE receives a retransmission of the DL HARQ procedure p0 in the subframe index 6 of frame m+1, wherein the first transmission and the retransmission are received on the same serving cell.

In FIG. 5C, the UE may receive up to 15 DL HARQ procedures (P0 to P14) during the time between the first transmission and the retransmission. Therefore, if the UL/DL configuration is 5, in the conventional TDD system, the maximum number of DL HARQ programs is 15 ( M _{DL_HARQ} = 15).

The advanced LTE (LTE-advanced, LTE-A) system (as its name suggests) is an upgrade of the LTE system's Rel-8 and Rel-9. The LTE-A system is designed to enable faster switching between power states, improve performance at the coverage edge of the eNB, and includes advanced technologies (eg, carrier aggregation (CA), coordinated multipoint (CoMP)). Transmission/reception, UL multiple-input multiple-output (MIMO) technology, etc. For UEs and eNBs that communicate with each other in an LTE-A system, the UE and the eNB may comply with standards developed for the LTE-A system, for example, the 3GPP Rel-10 standard or later.

A CA that can aggregate more than one carrier (eg, multiple component carriers, multiple serving cells) can be introduced into the LTE-A Rel-10 system and later technologies to achieve wider frequency band transmission. CA will increase bandwidth flexibility by aggregating multiple carriers Sex. When the UE is configured with a CA, the UE has the capability to receive and/or transmit packets via one or more carriers to increase overall system throughput. FIG. 6A illustrates an example of an FDD CA scheme for aggregating two FDD DL serving cells, and FIG. 6B illustrates a TDD CA scheme for aggregating two TDD serving cells. Therefore, when the maximum bandwidth of 20 MHz corresponding to each service cell that is backward compatible with the 3GPP Rel-8 standard is available, the LTE-A system can support a wider bandwidth of up to 100 MHz by aggregating the maximum number of five serving cells. The LTE-A system supports CA for two consecutive and non-continuous service cells, where each serving cell is limited to a maximum of 110 resource blocks. CA will therefore increase bandwidth flexibility by aggregating service cells.

When the UE is configured with a CA, the UE has the capability to receive and/or transmit packets via one or more serving cells (or configured multiple component carriers (CCs)) to increase its transmission throughput. If the FDD mode is implemented in the LTE-A system, it is possible for the eNB to configure the UE to a different number of uplink (UL) and downlink (DL) serving cells. Otherwise, if the TDD mode is implemented in the LTE-A system, it is possible for the eNB to configure the UE with different TDD UL/DL configurations for different serving cells.

In addition, the serving cells configured for the UE will typically include one or only one DL primary serving cell (DL PCell) and one or only one UL primary serving cell (UL PCell) in FDD mode. . Regarding operation in the TDD mode, a UE configured for a serving cell will typically include one or only one PCell and one or more secondary serving cells (SCells). The number of configured SCells is arbitrary and And will typically be related to the UE's UL and/or DL aggregation capabilities and available radio resources.

Hybrid Automatic Repeat reQuest (HARQ) procedures have been employed in LTE systems to provide efficient and reliable communication. The HARQ program has adopted a forward correcting code (FEC) because it is different from the Automatic Repeat ReQuest (ARQ) program. For example, assuming that the mobile device has correctly decoded the packet, the mobile device can feed back a positive acknowledgment (ACK) to inform the network that the mobile device has correctly received the packet. Conversely, if the mobile device is unable to correctly decode the packet, the mobile device can give a negative acknowledgement (NACK) to the network. In the case that the UE has received the NACK, the UE may store some or all of the received data packets in the soft buffer of the UE.

The soft buffer area size of the UE may be indicated by the total number of soft channel bits ( N _soft ) and varies with its UE class as illustrated in FIG. 7 . A detailed description of the specific operations associated with FIG. 7 is described in 3GPP TS 36.306, incorporated by reference, ie, "E-UTRA; User Equipment (UE) radio access capabilities (version 12)"". In response to receiving a retransmission packet from a wireless transmitter of another wireless node, the UE may combine the retransmission packet with the soft value of the stored packet. The UE's receiver can decode the packet by using the combined soft value. In addition, the combination of one or more previously erroneously received packets and the currently received packets will increase the probability of successful decoding. The UE will continue the HARQ procedure until the packet is correctly decoded or until the maximum number of retransmissions have been sent. When the maximum number of retransmissions is reached, the HARQ procedure will fail and thus the UE may allow the ARQ procedure of the Radio Link Control (RLC) to be attempted again. In other words, the space of the soft scratchpad will be reserved for the HARQ program so that the UE can store the results of the HARQ program that has not been correctly decoded. Otherwise, if the soft scratchpad is fully occupied, HARQ may be blocked. When multiple packets are transmitted to the UE, the UE will typically need to store multiple HARQ programs due to unsuccessful attempts to decode the packets.

As described previously, in the LTE/LTE-A system, the UE can store a maximum of 8 HARQ programs per soft cell in the soft temporary storage area. Each HARQ program can carry at least one packet. The packet may be, for example, a Transport Block (TB) in an LTE system. A transport block is a data unit that is transmitted from an eNB (e.g., 101) to at least one UE (e.g., 102) on a PDSCH (e.g., 303) in an LTE radio frame. Each LTE radio frame has a period of 1 millisecond (ms). Each LTE radio frame is 10ms and contains 10 LTE radio frames. When operating under a multiple input multiple output (MIMO) approach (eg, spatial multiplexing), more than one transport block may be transmitted for each transmission time interval (TTI) of the UE. Therefore, the soft temporary storage area partitioning method in a network including at least one serving cell will be explained below.

Please refer to FIG. 4A and FIG. 7 for the following description. According to 3GPP TS 36.213, which is incorporated by reference, ie, "E-UTRA; Physical Layer Procedure (Release 12)", N _soft can be divided into a plurality of partitions according to the following equation to store soft channel bits:

For a clearer description, for FDD, TDD, and FDD-TDD, if the UE is configured with more than one serving cell or if the UE is configured with a Secondary Cell Group (SCG), then for each serving cell, and for at least _{(K MIMO .min (M DL_HARQ,} M limit)) transmission block, the encoding block is detected after decoding the transmitted block fails, the UE may be stored corresponding to the range of at least n channels received soft bits _SB Soft channel bit, where: C is the number of code blocks of the transport block (TB).

N _cb is the size of the coding block of the transport block (TB).

K _MIMO is the maximum number of transport blocks that can be transmitted to a UE in the TTI of a serving cell.

M _limit is a positive value equal to 8.

M _{DL_HARQ} is the maximum number of DL HARQ programs as shown in FIG.

If the UE is configured with SCG, then Is the number of serving cells configured across both the Mandatory Cell Group (MCG) and the Secondary Cell Group (SCG); otherwise, Is the number of service cells configured.

Min ( M _{DL_HARQ} , M _limit ) is a comparison of M _{DL_HARQ} and M _limit and returns a smaller value of M _{DL_HARQ} and M _limit .

Figure 8 illustrates the steps of a conventional soft scratchpad partitioning method. As shown in Equation 1, when the UE is configured with more than one serving cell or if the UE is configured with a secondary cell group (SCG), the soft temporary storage area will be allocated to each configured serving cell and/or each cell group group. The soft temporary storage area is divided according to the following steps: In step S801, the UE will determine the total number of soft channel bits ( N _soft ) and the number of DL serving cells ( ).

In step S802, if the UE is configured to Service cells, the UE can distinguish the entire soft temporary storage into soft temporary storage areas for each service cell. a sub-block, wherein the size of each sub-block of the soft temporary storage area is .

In step S803, the UE may further divide each sub-block of the soft temporary storage area into min ( M _{DL_HARQ} , M _limit ) partitions for the HARQ program, wherein the size of each partition for the HARQ program is .

For example, if the UE is configured to Service cells, the soft temporary storage area is divided Serving cells. In other words, if the UE is configured to Service cells, you can divide the entire soft temporary storage into Each sub-block is given to each serving cell, wherein each sub-block of the soft temporary storage area has the size of. For each service cell, up to min ( M _{DL_HARQ} , M _limit ) HARQ programs can be stored in the soft temporary storage area, and the size of the soft temporary storage area of each HARQ program is at least Soft channel bits. In addition, for each transport block within the HARQ program, the size of the soft buffer area of each HARQ program is at least Soft channel bits.

The application of the concept of Figure 8 shown in Figure 9, which illustrates the steps of a conventional soft temporary storage zone partition with 3 DL serving cells (one DL PCell and two DL SCells) in an FDD system, and thus Equal to 3. In this FDD example, for each DL serving cell, M _{DL_HARQ} is equal to 8, and transmit diversity is configured to the UE; thus K _{MIMO is} set to 1. Referring to FIG. 8 and FIG. 9 together, the soft temporary storage area is divided as follows. In step S801, the UE will determine the total number of soft channel bits (eg, 905) ( N _soft ) and the number of DL serving cells (eg, =3). In step S802, if the UE is configured to three serving cells, the UE may divide the entire soft temporary storage into three sub-blocks of the soft temporary storage area (for example, 902, 903, 904) for each serving cell. The size of each sub-block of the soft temporary storage area is . In step S803, the UE may further divide each sub-block of the soft temporary storage area into 8 partitions for the HARQ program, wherein the size of each partition (for example, 901) for the HARQ program is .

Referring to FIG. 9, if the UE is configured to three serving cells, the UE divides the entire soft temporary storage into three sub-blocks of the soft temporary storage area, which includes the first sub-block 902 for each serving cell, The second sub-block 903 and the third sub-block 904. Each sub-block of the soft temporary storage area is divided into 8 partitions for the HARQ program (for example, divided into 1-1 to 1-8 for the first sub-block 902, and 2-1 to the second sub-block 903). 2-8, divided into 3-1 to 3-8 for the third sub-block 904, wherein the size of each partition for the HARQ program is . The first sub-block 902 can be used for the PCell, the second sub-block 903 can be used for the first SCell, and the third sub-block 904 can be used for the second SCell.

As an application of FIG. 8, FIG. 10 illustrates the steps of a conventional soft scratchpad partition having three TDD service cells in a TDD system. In this example, the 3 TDD serving cells will contain a PCell with UL/DL configuration 0 and two SCells with UL/DL configuration 5, and thus Equal to 3. In this example, for PCell and SCell, M _{DL_HARQ} is equal to 4 and 15, respectively. And the transmit diversity is configured to the UE; therefore, K _{MIMO is} set to 1. Referring to FIG. 8 and FIG. 10 together, the soft temporary storage area is divided as follows. In step S801, the UE will determine the total number of soft channel bits (eg, 1006) ( N _soft ) and the number of DL serving cells (eg, =3). In step S802, if the UE is configured as three serving cells, the UE may divide the entire soft temporary storage into three sub-blocks of the soft temporary storage area (for example, 1003, 1004, 1005) for each serving cell, wherein The size of each sub-block of the soft buffer is . In step S803, the UE may further divide each sub-block of the soft temporary storage area into min ( M _{DL_HARQ} , M _limit ) partitions (for example, 1001, 1002) for the HARQ program, where each of the HARQ programs is used. The size of the partition is . For PCell, the size of each partition (for example, 1001) used for the HARQ program is . For SCell, the size of each partition (for example, 1002) used for the HARQ program is .

Referring to FIG. 10, if the UE is configured as three serving cells, the entire soft temporary storage area 1006 is divided into three sub-blocks of the soft temporary storage area (the first sub-block 1003 and the second sub-block for each serving cell). 1004 and the third sub-block 1005). For the PCell, the sub-block of the soft temporary storage area is divided into 4 partitions for the HARQ program (divided into 1-1 to 1-4 for the first sub-block 1003), where the size of each partition for the HARQ program is used. for . For the SCell, the sub-blocks of the soft temporary storage area are divided into 8 partitions for the HARQ program (divided into 2-1 to 2-8 for the second sub-block 1004, and 3-1 to the third sub-block 1005). 3-8), where the size of each partition used for the HARQ program is . The first sub-block 1003 will be used for the PCell, the second sub-block 1004 will be used for the first SCell, and the third sub-block 1005 will be used for the second SCell.

Figure 11 illustrates a conventional DL HARQ ACK or NACK (ACK/NACK) feedback timeline in an FDD system. For FDD systems, the UE transmits HARQ ACK/NACK feedback in response to at least one PDSCH transmission in subframe n to report DL HARQ transmissions, wherein the corresponding DL control channel (eg, entity) within subframe n -4 A DL HARQ transmission is indicated by a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (ePDCCH). As shown in Figure 11, the ACK/NACK response will be transmitted in the 4th subframe after the initial transmission.

Regarding the TDD single serving cell system, the downlink association set index K for TDD in FIG. 12 will be applied: { k ₀ , k ₁ , ... , k _{M -1} }, where M is in the downlink association set The number of elements, and the downlink association set index includes at least one element. A detailed description of the application of Fig. 12 can be observed in Table 10.1.3.1-1 in TS 36.213 incorporated by reference. In essence, the UE will transmit HARQ ACK or NACK (ACK/NACK) feedback in response to at least one PDSCH transmission in subframe n 1202 to transmit a corresponding DL control channel (eg, entity) in subframe n - k A downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH) is reported as the indicated DL HARQ transmission, where k K is related to its UL/DL configuration 1201 of serving cells. Briefly, with configuration 0 as an example, the UE will transmit DL HARQ ACK/NACK feedback in subframe index 1202n=4 in response to receiving the transmission in subframe index 0 (4-4=0). Similarly, the UE will respond to receive transmissions in subframe index 1 (ie, 7-6=1) and subframe index 5 (ie, 9-4=5), respectively, in subframe indices 7 and 9. Transmit HARQ ACK/NACK feedback.

FIG. 13A illustrates a DL HARQ ACK or NACK (ACK/NACK) feedback timeline in a TDD single serving cell system configured with UL/DL configuration 0. Referring to both FIG. 12 and FIG. 13A, the UE will transmit DL HARQ ACK/NACK feedback in response to at least one physical DL Shared Channel (PDSCH) transmission in subframe n to report DL HARQ transmission, where A corresponding DL control channel (eg, a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH)) in the subframe n - k indicates DL HARQ transmission, where k K is related to its UL/DL configuration 0. In this example, UE in subframe in the frame m is 4,7 or inquiry 9 transmitted DL HARQ ACK / NACK feedback information in order to report the frame subframe 0,1 m corresponding to the control channel or by a 5 DL (eg, DL HARQ transmission indicated by a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (ePDCCH)). Subsequently, the UE will transmit a DL HARQ ACK/NACK feedback in the subframe 2 of the frame m+1 to report the corresponding DL control channel in the subframe 6 of the frame m (for example, the physical downlink control channel (Physical) The DL HARQ transmission indicated by the Downlink Control Channel (PDCCH) or the Enhanced Physical Downlink Control Channel (ePDCCH).

In the example illustrated in Figure 13, the transmission of HARQ ACK/NACK will be delayed due to the absence of uplink subframes within the four subframes. The special subframe "S" will be treated as a downlink subframe. A similar concept would apply to the DL HARQ ACK/NACK feedback timeline in a TDD single serving cell system configured with UL/DL configuration 1 as illustrated in Figure 13B.

FIG. 13C illustrates a DL HARQ ACK or NACK (ACK/NACK) feedback timeline in a TDD single serving cell system configured with UL/DL configuration 5. For Figure 13C, UE will respond to subframe n of at least a PDSCH transmission transmitted DL HARQ ACK / NACK feedback to report in subframe n a - DL corresponding to the k-th control channel (e.g., physical downlink control channel DL HARQ transmission indicated by (PDCCH) or Enhanced Physical Downlink Control Channel (ePDCCH), where k K is related to its UL/DL configuration 5. In this example, the UE shall transmit DL HARQ ACK/NACK feedback in subframe 2 of frame m + 2 to report the corresponding DL control channel in subframe 9 of frame m (eg, physical downlink control) The DL HARQ transmission indicated by the channel (PDCCH) or the enhanced physical downlink control channel (ePDCCH) and corresponding to the subframe 0/1/3/4/5/6/7/8 in the frame m +1 DL HARQ transmission indicated by a DL control channel (eg, a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (ePDCCH)).

For a TDD inter-band CA case, at least one SCell may be configured to be a different UL/DL configuration than the PCell. In this particular case, for serving cell c , the UE may transmit DL HARQ ACK or NACK (ACK/NACK) feedback in response to at least one entity DL shared channel (PDSCH) transmission in subframe n for reporting by a DL HARQ transmission indicated by a control channel (for example, a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH)) of the DL in the frame n - k , Where k Reference DL- UL K _c cells and Services / DL configurations related, where K _c is associated with a downlink serving cell c collection. Further, determination of K _c according to its DL-reference UL/DL configuration will be described below.

For PCell, the DL-reference UL/DL configuration is the UL/DL configuration of the PCell. For SCell, the DL-reference UL/DL configuration is determined according to FIG. 14 illustrates a different set 1401 of DL-reference UL/DL configurations 1403 for serving cells based on one or more pairs formed by primary cell UL/DL configuration and secondary cell UL/DL configuration 1402.

As an example, FIG. 15 illustrates a DL HARQ ACK or NACK (ACK/NACK) feedback timeline in which the PCell 1501 is configured with UL/DL configuration 0 and the SCell 1502 is configured with UL/DL configuration 5 in the TDD CA system. Therefore, as shown in FIG. 15, the DL-reference UL/DL configuration of the PCell 1501 is UL/DL configuration 0 and the DL-reference configuration of the SCell 1502 is the UL/DL configuration 5. Since the DL HARQ ACK/NACK feedback time axis is determined according to the DL-reference UL/DL configuration of the serving cell, the DL HARQ ACK/NACK feedback time axes of the PCell and SCell are UL/DL configurations 0 and 5, respectively. Because different UL/DL configurations are configured as different serving cells, DL HARQ ACK/NACK feedback corresponding to the same subframe can be transmitted on different subframes according to the corresponding DL-reference UL/DL configuration. In the case of FIG. 15, since the UE can receive the DL HARQ procedure in the subframe 0 of the frame m of the two serving cells, the UE can transmit the DL HARQ procedure of the PCell on the subframe 4 of the frame m . Corresponding to DL HARQ ACK/NACK feedback, and the UE may transmit corresponding DL HARQ ACK/NACK feedback of the DL HARQ procedure of the SCell on the subframe 2 of the frame m +1.

The present disclosure provides a method and related apparatus for handling communication operations in a communication system.

In one of the exemplary embodiments, the present disclosure proposes a method of processing a communication operation in a communication system and related devices. According to one of the exemplary embodiments, the present disclosure provides a method for a mobile device to handle a communication operation in a wireless communication system, the method being applicable to a mobile device configured with a plurality of service cells through a network of a wireless communication system, The plurality of service cells include a first serving cell and a second serving cell. The method will include receiving, by a first serving cell, a first transmission in a first subframe and decoding the first transmission; generating a decoding result in response to decoding the first transmission; in the second subframe In-frame transmission acknowledgement (ACK) or negative acknowledgement (NACK), where ACK or NACK (ACK/NACK) corresponds to the decoding knot And receiving a second transmission in the third subframe via the second serving cell, wherein the second transmission is a retransmission of the first transmission.

In one of the exemplary embodiments, the present disclosure proposes a method for a mobile device to handle a communication operation in the wireless communication system for a network of a wireless communication system, the method being adapted to configure a plurality of service cells to A network of mobile devices, the plurality of serving cells including a first serving cell and a second serving cell. The method will include transmitting a first transmission in a first subframe via a first serving cell; receiving an acknowledgment (ACK) or a negative acknowledgment (NACK) in a second subframe, wherein ACK or NACK (ACK/NACK) Corresponding to the first transmission; and transmitting the second transmission in the third subframe via the second serving cell, wherein the second transmission is a retransmission of the first transmission.

The above described features and advantages of the invention will be apparent from the following description.

It should be understood, however, that the disclosure is not intended to be limited or limited by the invention. Moreover, the present disclosure will include modifications and modifications obvious to those skilled in the art.

100‧‧‧LTE system

101‧‧‧Evolved Node B (eNodeB)

102‧‧‧User equipment

103‧‧‧core network

104‧‧‧Mobility Management Entity (MME)

105‧‧‧Service Gateway (S-GW)

201‧‧‧Uplink subframe (U)

202‧‧‧Down subframe (D)

203‧‧‧Special subframe (S)

300‧‧‧Downlink subframe

301‧‧‧Physical downlink control channel

303‧‧‧ Physical downlink shared channel

401‧‧ Divided Duplex (FDD)

402‧‧‧Maximum number of downlink HARQ procedures

403‧‧‧Time Division Duplex (TDD)

902‧‧‧1st sub-block

903‧‧‧2nd sub-block

904‧‧‧3rd sub-block

1003‧‧‧1st sub-block

1004‧‧‧2nd sub-block

1005‧‧‧3rd sub-block

1601‧‧‧Processor/Controller

1201‧‧‧Uplink/downlink configuration

1202‧‧‧ subframe number n

1401‧‧‧ Collection#

1402‧‧‧ (primary cell uplink/downlink configuration, secondary cell uplink/downlink configuration)

1403‧‧‧Downlink-reference uplink/downlink configuration

1602a-1602c‧‧‧Digital/Analog Converter/A/D Converter

1603a‧‧‧LTE-U transmitter

1603b‧‧‧LTE-U Receiver

1604a‧‧ Wi-Fi transmitter

1604b‧‧ Wi-Fi Receiver

1605a‧‧‧LTE transmitter

1605b‧‧‧LTE receiver

1606‧‧‧Memory Module

1607‧‧‧Antenna

1606a‧‧‧LTE-U protocol module

1606b‧‧‧Wi-Fi Protocol Module

1606c‧‧‧LTE Protocol Module

1701‧‧‧ Authorized FDD DL service cells

1702‧‧‧Unauthorized full DL service cells

1711‧‧‧ Authorized FDD DL service cells

1712‧‧‧First unauthorized full DL service cell

1713‧‧‧Second unauthorized full DL service cell

1721, 1731, 1741, 1751, 1761‧‧ ‧ authorized service cells

1722, 1732, 1742, 1752, 1762‧‧‧ Unauthorized service cells

1901‧‧‧ Authorized service cells assist at least one unauthorized service cell

Number of unauthorized service cells in the 1902‧‧‧LAA group

Traffic load of unauthorised service cells in the 1903‧‧‧LAA group

The drawings are included to provide a further understanding of the present disclosure, and are incorporated in this specification and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure, and together with the description, explain the principles of the disclosure.

FIG. 1 is a block diagram illustrating a typical LTE communication system as an example.

Figure 2 illustrates a plurality of UL/DL configurations currently implemented through an LTE communication system.

FIG. 3A illustrates the use of Downlink Control Information (DCI) to schedule downlink resources in a typical LTE communication system.

Figure 3B illustrates the PDSCH scheduling timeline in a typical LTE communication system.

4A illustrates the maximum number of DL HARQ programs and the number of bits used to indicate the number of DL HARQ procedures for TDD and FDD duplex modes.

FIG. 4B illustrates a current LTE HARQ ACK or NACK (ACK/NACK) feedback procedure.

FIG. 5A illustrates an example of the maximum number of DL HARQ programs in the FDD mode.

FIG. 5B illustrates an example of the maximum number of DL HARQ programs in TDD mode in UL/DL configuration 0.

FIG. 5C illustrates an example of the maximum number of DL HARQ programs in the TDD mode in the UL/DL configuration 5.

FIG. 6A illustrates an example of CA in FDD mode.

FIG. 6B illustrates an example of CA in TDD mode.

Figure 7 illustrates the soft scratchpad size of the UE as indicated by the total number of soft channel bits as a function of its UE class.

Figure 8 is a flow chart illustrating a conventional method of dividing a soft temporary storage area.

Figure 9 illustrates the steps of a conventional soft scratchpad partition in an FDD system with 3 DL serving cells.

Figure 10 illustrates the conventional soft in a TDD system with 3 TDD serving cells The steps for the staging area partition.

Figure 11 illustrates a conventional DL HARQ ACK or NACK (ACK/NACK) feedback timeline in an FDD system.

Figure 12 illustrates a downlink association set index K for TDD: { k ₀ , k ₁ , ... , k _{M -1} }.

FIG. 13A illustrates a DL HARQ ACK or NACK (ACK/NACK) feedback timeline in a TDD single serving cell system configured with UL/DL configuration 0.

FIG. 13B illustrates a DL HARQ ACK or NACK (ACK/NACK) feedback timeline in a TDD single serving cell system configured with UL/DL configuration 1.

FIG. 13C illustrates a DL HARQ ACK or NACK (ACK/NACK) feedback timeline in a TDD single serving cell system configured with UL/DL configuration 5.

14 illustrates a different set of downlink-reference UL/DL configurations for secondary serving cells based on one or more pairs formed by primary cell UL/DL configuration and secondary cell UL/DL configuration.

15 illustrates a DL HARQ ACK or NACK (ACK/NACK) feedback timeline in a TDD CA system in which PCell and SCell are configured with different UL/DL configurations.

Figure 16A illustrates carrier aggregation implemented by aggregating at least one serving cell deployed on a licensed spectrum and at least one serving cell deployed on an unlicensed spectrum.

16B illustrates a method proposed by a cross-carrier HARQ retransmission mechanism in accordance with a first exemplary embodiment of the present disclosure.

Figure 16C illustrates the mobile device proposed by the present disclosure.

16D illustrates a network suitable for use in accordance with one of the exemplary embodiments of the present disclosure. The method proposed by the mobile device in the wireless communication system of the road to handle the communication operation.

17A illustrates the maximum number of LAA groups having DL HARQ procedures when authorizing FDD service cells to assist unauthorized full DL serving cells in accordance with a second exemplary embodiment of the present disclosure.

17B illustrates the maximum number of LAA groups having DL HARQ procedures when authorizing FDD service cells to assist two unlicensed full DL serving cells in accordance with a second exemplary embodiment of the present disclosure.

17C illustrates an LAA group when the TDD service cells are authorized to assist an unauthorised TDD serving cell in accordance with the second exemplary embodiment of the present disclosure, wherein both of the above service cells are configured with TDD UL/DL configuration 0. Has the maximum number of DL HARQ programs.

17D illustrates a LAA group when an authorized TDD service cell assists an unauthorized TDD service cell in which both of the above service cells are configured with a TDD UL/DL configuration 5, in accordance with a second exemplary embodiment of the present disclosure. Has the maximum number of DL HARQ programs.

17E illustrates that when authorizing a TDD serving cell to assist an unlicensed TDD serving cell in accordance with a second exemplary embodiment of the present disclosure, wherein the TDD serving cell is configured to configure TDD UL/DL configuration 0 and the TDD service cell is not configured to configure TDD UL/ When DL configuration 5, the LAA group has the maximum number of DL HARQ programs.

17F illustrates a LAA group having a DL HARQ procedure when an authorized TDD serving cell is configured with a TDD UL/DL configuration 0 when the authorized TDD service cell assists a full DL serving cell in accordance with the second exemplary embodiment of the present disclosure. Maximum number Head.

17G illustrates a LAA group having a DL HARQ procedure when authorizing an FDD serving cell to assist an unauthorised TDD serving cell in accordance with a second exemplary embodiment of the present disclosure, wherein the authorized TDD serving cell is configured with TDD UL/DL configuration 0 The maximum number.

FIG. 18 is a flowchart illustrating a method of dividing a soft temporary storage area according to a third exemplary embodiment of the present disclosure.

FIG. 19A illustrates determining whether M _limit is based on whether an authorization service cell assists at least one unauthorized service cell in accordance with a third exemplary embodiment of the present disclosure.

FIG. 19B, M _limit is determined according to the number of unauthorized service group based cell LAA third exemplary embodiment of the present disclosure.

FIG 19C illustrate M _limit load is determined according to the flow cell unauthorized service group based LAA third exemplary embodiment of the present disclosure.

FIG. 19D illustrate M _limit determined according to the number of unauthorized traffic load on the serving cell based LAA unauthorized third exemplary embodiment group embodiment of the present disclosure and LAA group serving cell.

FIG. 19E illustrate M _limit is determined according to the congestion of the group based on the unauthorized LAA serving cell a third exemplary embodiment of the present disclosure.

20 illustrates an example of configuring two authorized TDD service cells and one unauthorized TDD service cell, wherein one of the authorized TDD service cells assists an unauthorized TDD service cell, and two of them, in accordance with a third exemplary embodiment of the present disclosure. Each authorized TDD service cell is configured with TDD UL/DL configuration 0.

21 illustrates an example of configuring two authorized TDD service cells and one unauthorized TDD service cell in accordance with a third exemplary embodiment of the present disclosure, wherein one of the authorized TDD service cells assists an unauthorised TDD service cell, and two of Each authorized TDD service cell is configured with UL/DL configuration 0.

22 illustrates an example of configuring two authorized FDD DL serving cells and an unauthorized FDD DL serving cell in accordance with a third exemplary embodiment of the present disclosure, wherein one of the authorized FDD DL serving cells assists an unauthorized FDD DL serving cell.

23 illustrates an example of configuring two authorized FDD DL serving cells and an unauthorized FDD DL serving cell in accordance with a third exemplary embodiment of the present disclosure, wherein one of the authorized FDD DL serving cells assists an unauthorized FDD DL serving cell.

24 illustrates an example of processing a HARQ ACK or NACK (ACK/NACK) feedback timeline of a TDD cross-band CA system in accordance with a fourth exemplary embodiment of the present disclosure, wherein the grant service cell is configured with UL/DL configuration 0 and is not authorized The serving cell is configured with UL/DL configuration 5.

Figure 25 illustrates a modified downlink association set index K ₀ for unlicensed TDD service cells when the TDD service cell is not authorized to be assisted by the authorized TDD service cell: { k ₀ , k ₁ , ... , k _{M -1} } , where the authorized TDD service cell is configured with UL/DL configuration 0.

Figure 26 illustrates a modified downlink association set index K ₁ for unlicensed TDD serving cells when an unauthorized TDD serving cell is assisted by an authorized TDD serving cell: { k ₀ , k ₁ , ... , k _{M -1} } , where the authorized TDD service cell is configured with UL/DL configuration 1.

Figure 27 illustrates a modified downlink association set index K ₂ for unlicensed TDD service cells when the TDD service cell is not authorized to be assisted by the authorized TDD service cell: { k ₀ , k ₁ , ... , k _{M -1} } , where the authorized TDD service cell is configured with UL/DL configuration 2.

FIG 28 illustrates cells when unauthorized TDD service for the authorized auxiliary TDD downlink serving cell associated with unauthorized modification TDD serving cell set index _{K 3: {k 0, k} 1, ..., k M -1} , where the authorized TDD service cell is configured with UL/DL configuration 3.

29 illustrates a modified downlink association set index K ₄ for an unlicensed TDD serving cell when an unauthorized TDD serving cell is assisted by an authorized TDD serving cell: { k ₀ , k ₁ , ... , k _{M -1} } , where the authorized TDD service cell is configured with UL/DL configuration 4.

Figure 30 illustrates a modified downlink association set index K ₅ for unlicensed TDD service cells when an unauthorized TDD service cell is assisted by an authorized TDD service cell: { k ₀ , k ₁ , ... , k _{M -1} } , where the authorized TDD service cell is configured with UL/DL configuration 5.

Figure 31 illustrates a modified downlink association set index K ₆ for unlicensed TDD service cells when an unlicensed TDD service cell is assisted by an authorized TDD service cell: { k ₀ , k ₁ , ... , k _{M -1} } , where the authorized TDD service cell is configured with UL/DL configuration 6.

Reference will now be made in detail to the exemplary embodiments embodiments Wherever possible, the same reference numerals are used in the drawings

For traditional CA technology, each service cell is deployed on a licensed spectrum that supports non-competitive communication. With enhanced CA, data offload and coexistence with other unlicensed spectrum deployments are more important for future LTE deployments to handle increased throughput and capacity requirements. Therefore, by enhancing CA, at least one serving cell can be part of The Department is supporting an unlicensed band based on competitive communications and at least one service cell is deployed on a licensed band that supports non-competitive communications. Unlicensed spectrum is also known as free spectrum, for example, the Industrial, Scientific and Medical (ISM) band and any other radio that is not currently dedicated. As shown in FIG. 16A, an overall scheme utilizing both licensed spectrum and unlicensed spectrum is referred to as Licensed-Assisted Access (LAA) using LTE.

16B illustrates a method of processing a communication operation by a mobile device in a proposed wireless communication system, which is applicable to a mobile device. The mobile device can be configured with a plurality of service cells through a network of the wireless communication system, the plurality of service cells including the first serving cell and the second serving cell. In step S1601, the mobile device will receive the first transmission in the first subframe via the first serving cell and decode the first transmission. In step S1602, the mobile device will generate a decoding result in response to decoding the first transmission. In step S1603, the mobile device will transmit an acknowledgment (ACK) or a negative acknowledgment (NACK) in the second subframe, where ACK or NACK (ACK/NACK) corresponds to the decoding result. In step S1604, the mobile device will receive the second transmission in the third subframe via the second serving cell, wherein the second transmission is a retransmission of the first transmission.

The method of processing communication operations in the proposed communication system includes four exemplary embodiments. The first exemplary embodiment relates to cross-carrier HARQ retransmission. A second exemplary embodiment relates to determining M _{DL_HARQ} based on a combination of serving cells. The third exemplary embodiment provides specific details regarding soft scratchpad partitioning. The fourth exemplary embodiment determines a HARQ acknowledgment (ACK)/negative acknowledgment (NACK) feedback timeline in response to the first transmission of step S1602.

According to a first exemplary embodiment, the first serving cell may be an authorized serving cell or an unauthorized serving cell. The second serving cell can be an authorized service cell or an unauthorized service cell. The first serving cell and the second serving cell may be the same or different. The second subframe may be after the first subframe; and the third subframe may be after the second subframe. The proposed method of FIG. 16B may further include storing the at least one soft channel bit of the first transmission in at least one partition of the soft temporary storage area if the first transmission is not successfully decoded.

According to a second exemplary embodiment of the present disclosure, is determined based on the first _M DL_HARQ _M DL_HARQ second composition _M DL_HARQ authorized and unauthorized serving cell serving cell, wherein the cell when authorized and unauthorized service serving cell independent operation, the first _Both M _{DL_HARQ} and second M _{DL_HARQ} are the maximum number of downlink HARQ procedures.

According to the second exemplary embodiment of the present disclosure, when the unauthorized service cell and the authorized service cell are in the LAA group, the M _{DL_HARQ is the} same for the unauthorized service cell and the authorized service cell.

According to the second exemplary embodiment of the present disclosure, if the authorized serving cell is a frequency domain duplexing (FDD) DL serving cell and the unlicensed serving cell is a full DL serving cell, the M _{DL_HARQ} is 16 and the downlink The field indicating M _{DL_HARQ} in the downlink control indicator (DCI) is 4 bits.

According to the second exemplary embodiment of the present disclosure, if the LAA group further includes the second unlicensed full DL serving cell, the M _{DL_HARQ} is 24 and the field in the DCI is 5 bits.

According to the second exemplary embodiment of the present disclosure, if both the authorized serving cell and the unauthorized serving cell are configured with UL/DL configuration 0, M _{DL_HARQ} is 8 and the field indicating M _{DL_HARQ} in the DCI is 3 bits.

According to the second exemplary embodiment of the present disclosure, if the UL/DL configuration 5 is configured to both the authorized service cell and the unauthorized service cell, the M _{DL_HARQ} is 30 and the field indicating the M _{DL_HARQ} in the DCI is 5 bits. .

According to the second exemplary embodiment of the present disclosure, if UL/DL configuration 0 is configured to an authorized serving cell and UL/DL configuration 5 is configured to an unauthorized serving cell, M _{DL — HARQ} is 13 and a column indicating M _{DL — HARQ} in the DCI The bit is 4 bits.

According to the second exemplary embodiment of the present disclosure, if the UL/DL configuration 0 is configured to the authorized service cell and the unlicensed serving cell is a full DL serving cell, the M _{DL_HARQ} is 14 and the field indicating the M _{DL_HARQ} in the DCI is 4 One bit.

According to the second exemplary embodiment of the present disclosure, if the authorization service cell is configured as an FDD DL serving cell and the UL/DL configuration 0 is configured to an unauthorized serving cell, the M _{DL_HARQ} is 12 and the field indicating the M _{DL_HARQ} in the DCI It is 4 bits.

According to the third exemplary embodiment of the present disclosure, for each HARQ program, each sub-block is divided into a plurality of partitions according to K _MIMO * min ( M _{DL — HARQ} , M _limit ), where min ( M _{DL — HARQ} , M _limit ) is used The smaller of M _{DL_HARQ} and M _limit discards the larger one.

According to the third exemplary embodiment of the present disclosure, each partition in each transport bolck for each HARQ program has at least The soft channel bit size.

According to the third exemplary embodiment of the present disclosure, M _{limit is} determined according to whether the authorized service cell assists the unauthorized service cell. Specifically, if the authorization service cell assists the unauthorised serving cell, the M _limit will be 12; otherwise the M _limit will be 8.

According to the third exemplary embodiment of the present disclosure, M _limit is determined according to the number of unauthorized service cells configured to the mobile device. Specifically, if the number of unauthorized service cells configured for the mobile device is 1, 2 or respectively 3, then M _limit is 12, 16 or 20.

According to the third exemplary embodiment of the present disclosure, M _{limit is} determined according to a traffic load category of unauthorized service cells. Specifically, if the traffic load categories of unauthorized service cells are high, medium, and low, respectively, M _limit will be 16, 12, and 8.

According to the third exemplary embodiment of the present disclosure, M _limit is determined according to the congestion rate of unauthorized service cells. Specifically, if the occlusion rates of unauthorised serving cells are high, medium, and low, respectively, M _limit is 8, 12, and 16.

According to a third exemplary embodiment of the present disclosure, the at least one service according to the number of cells arranged unauthorized service category traffic load cell and at least one unauthorized configured to determine M _limit.

According to the third exemplary embodiment of the present disclosure, it is assumed that the first authorized serving cell operates on the first component carrier (CC #1), the unlicensed serving cell operates on the third component carrier (CC #3), and the mobile device further configures The second authorized service cell is operated on the second component carrier (CC#2), and the first authorized service cell, the second authorized service The cells and unauthorized service cells are part of the LAA group, at which point CC#2 and CC#2 share the same sub-block of the soft buffer.

According to the fourth exemplary embodiment of the present disclosure, if the subframe n is DL for both the authorized serving cell and the unauthorized serving cell, the HARQ transmission corresponding to the subframe n is moved by the same UL subframe. Device transmission.

According to the fourth exemplary embodiment of the present disclosure, the DL HARQ transmission corresponding to the DL subframe of the unlicensed serving cell is distributed as evenly as possible on the UL subframe of the unauthorized serving cell.

According to the fourth exemplary embodiment of the present disclosure, the DL HARQ transmission corresponding to the DL subframe n of the unlicensed serving cell is transmitted on the uplink subframe closest to the subframe n+c, where c is a constant, For example, 4.

According to the fourth exemplary embodiment of the present disclosure, if the UL/DL configuration 0 is configured to the authorized service cell and the UL/DL configuration 5 is configured to the unauthorized service cell, if the first HARQ transmission is in the subframe of the frame m The second downlink corresponding to the first HARQ transmission occurs in the subframe 6 or 7 of the frame m-1.

According to the fourth exemplary embodiment of the present disclosure, if the second HARQ transmission occurs in the subframe 3 of the frame m, the second downlink corresponding to the second HARQ transmission is in the subframe m-1 Occurs in block 7 or 8.

According to the fourth exemplary embodiment of the present disclosure, if the third HARQ transmission occurs in the subframe 4 of the frame m, the second downlink corresponding to the third HARQ transmission is in the subframe m-1 Occurs in box 0.

Figure 16C illustrates the proposed mobile device, which will be implemented as shown in Figure 16B. The proposed method of processing communication operations in the communication system is shown and described in its corresponding written description. From a hardware perspective, a mobile device (e.g., a UE) may be represented by, without limitation, the functional elements as illustrated in Figure 16C. Referring to Figure 16C, mobile device 1600 will include at least, but not limited to, a processor and/or controller 1601 (hereinafter referred to as "processor 1601"), one or more digits/class ratios (D/A)/analog/ Digital (A/D) converters 1602a through 1602c, optionally LTE-U transmitter (TX) 1603a and LTE-U receiver (RX) 1603b, Wi-Fi TX 1604a and Wi-Fi RX 1604b, LTE TX 1605a And LTE RX 1605b, memory module 1606, and antenna 1607 (or antenna array).

The processor 1601 is configured to process digital signals and execute a program for processing the methods proposed for communication operations in a communication system as described herein. In addition, the processor 1601 can be coupled to the memory module 1606 (eg, the LTE-U protocol module 1606a, the Wi-Fi protocol module 1606b, and the LTE protocol module 1606c) to store software programs, code, device configurations, and code. This, temporary or permanent data, etc. The processor 1601 is configured to access and execute the modules recorded in the memory module 1606. The function of the processor 1601 can be implemented by using a programmable unit such as a microprocessor, a microcontroller, a digital signal processor (DSP) chip, or a Field Programmable Gate Array (FPGA). The functions of the processor 1601 can also be implemented by a separate electronic device or IC, and the functions performed by the processor 1601 can also be implemented in the hardware or software field.

The LTE-U protocol module 1606a will support the LTE-U protocol. This means that the processor 1601 executing the LTE-U protocol module 1606a converts the digital information into The LTE-U protocol is compatible in format and can access a cellular network such as an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The Wi-Fi Protocol Module 1606b will support the 802.11 (or Wi-Fi) protocol. This means that the processor 1601 executing the Wi-Fi protocol module 1606b will convert the digital information into a format compatible with the Wi-Fi protocol according to the IEEE 802.11 standard or the like (for example, IEEE 802.11x), and can access the wireless Wireless Local Access Network (WLAN). The LTE protocol module 1606c will support the LTE protocol. This means that the processor 1601 executing the LTE protocol module 1606c converts the digital information into a format compatible with the LTE protocol and can access a cellular network such as E-UTRAN. It should be noted that the LTE protocol module 1606c can optionally be combined with a 3G and/or 2G protocol module.

The D/A/A/D converters 1602a through 1602c are configured to convert from an analog signal format to a digital signal format during uplink signal processing and from a digital signal format to an analog signal format during downlink signal processing.

In unlicensed spectrum (eg, 5 GHz, 2.4 GHz, other Industrial, Scientific and Medical (ISM) radio bands, or unlicensed National Information Infrastructure (U-NII) bands) The LTE-U TX 1603a and the LTE-U RX 1603b are used to transmit and receive modulated signals, respectively, which may be wireless RF signals for the LTE-U protocol module 1606a (through one or more antennas) 1607). Wi-Fi TX 1604a and Wi-Fi RX 1604b operating at the unlicensed spectrum are used to transmit and receive modulated signals, respectively, which may be used for Wi-Fi protocol mode. Group 1606b's wireless RF signal (through one or more antennas 1607). The unlicensed spectrum operated by LTE-U TX 1603a, LTE-U RX 1603b, Wi-Fi TX 1604a, and Wi-Fi RX 1604b may be the same or different. LTE TX 1605a and LTE RX 1605b operating at the licensed spectrum (eg, band 700 MHz, 850 MHz, 1800 MHz, 1900 MHz, 2100 MHz, etc.) are used to transmit and receive modulated signals, respectively, which may be used for LTE protocol mode. Group 1606c's wireless RF signal (through one or more antennas 1607). LTE-U TX 1603a and LTE-U RX 1603b, Wi-Fi TX 1604a and Wi-Fi RX 1604b, and LTE TX 1605a and LTE RX 1605b may also perform, for example, low noise amplification, impedance matching, mixing, upsampling or down. Frequency conversion, filtering, amplification, etc.

The memory module 1606 can be a fixed or removable device in any possible form (including a non-transitory computer readable recording medium), such as a random access memory (RAM), read only memory (Read -Only Memory, ROM), flash memory or other similar device, or a combination of the above.

The Wi-Fi device in the disclosure may represent various embodiments, which may include, but are not limited to, a desktop computer, a laptop computer, a computer, a server, a client, a workstation, and a personal digital assistant ( Personal Digital Assistant (PDA), Tablet PC (Personal Computer, PC), scanner, telephone device, pager, camera, television, handheld video game device, music device, wireless sensor, etc. In some applications, the Wi-Fi device can be a stationary computer operating in a mobile environment (eg, bus, train, airplane, boat, car, etc.) Device.

A base station (e.g., an eNB) will have similar hardware components as a mobile device, including, without limitation, a processor, a storage medium or memory, an A/D D/A complex, a wireless transmitter, a wireless receiver, an antenna array, and the like. The functions of these elements are similar to those of mobile devices and will therefore not be repeated.

In order to operate using LTE under the LAA, the communication system will be required to comply with its regulatory requirements. In particular, for transmissions over unlicensed bands, contention-based communications have a limitation of maximum transmission time. For conventional CA operations, there is no limit to the maximum transmission time per service cell in any non-contention based communication. However, for CAs in LTE-LAA, at least one serving cell has a maximum transmission time limit in contention-based communications because at least one serving cell will be deployed on the unlicensed spectrum. For example, Europe has a Frame-Based-Equipment (FBE)-based Listen-Before-Talk (LBT) requirement that requires a maximum channel occupancy time or a maximum burst length of less than 10 milliseconds ( Ms), also requires maximum channel occupancy time or maximum burst length less than 13ms. In Japan, the maximum channel occupancy time in 5 GHz is less than 4 ms, so it is more strict. It can be seen that regulatory requirements will lead to system design changes.

If more than one serving cell (at least one serving cell is deployed on the licensed spectrum and at least one serving cell is deployed on the unlicensed spectrum) is configured for the UE, several items need to be processed. In one of the exemplary embodiments, if the non-contention-based authorization service cell assists at least one unauthorized service cell based on the contention transmission, the authorized and unauthorized service cells may be considered to be authorized auxiliary access. A (licensed-assisted access, LAA) group, which may be defined as an authorized service cell that assists at least one unauthorized service cell. In this case, the authorized service cell and the unauthorized service cell can be considered to be a licensed-assisted access (LAA) setting.

16D illustrates the proposed method of processing a communication operation by a mobile device in a wireless communication system suitable for use in a network in accordance with an exemplary embodiment of the present disclosure. The network of the wireless communication system configures a plurality of service cells to the mobile device, the plurality of service cells including the first serving cell and the second serving cell. In step S1651, the network will transmit the first transmission in the first subframe via the first serving cell. In step S1652, the network will receive an acknowledgment (ACK) or a negative acknowledgment (NACK) in the second subframe, wherein the acknowledgment or negative acknowledgment (ACK/NACK) corresponds to the first transmission. In step S1653, the network will transmit a second transmission in the third subframe via the second serving cell, wherein the second transmission is a retransmission of the first transmission.

In a first exemplary embodiment, the first serving cell may be an authorized serving cell or an unauthorized serving cell. The second serving cell can be an authorized service cell or an unauthorized service cell. The first serving cell and the second serving cell may be the same or different. The second subframe may be after the first subframe; and the third subframe may be after the second subframe.

In a second exemplary embodiment, if more than one serving cell (at least one serving cell is deployed on the licensed spectrum and at least one serving cell is deployed on the unlicensed spectrum) is configured for the UE, the maximum number of DL HARQ procedures will be modified ( M _{DL_HARQ} ). For legacy systems, each serving cell will have its own maximum number ( M _{DL_HARQ} ) of DL HARQ procedures as each serving cell transmits its DL HARQ procedure individually. One difference between the present disclosure and the traditional CA mechanism is that if an authorized service cell operating under non-contention based transmission assists at least one unauthorized serving cell operating on a contention based transmission, then transmitting on the unlicensed serving cell The DL HARQ procedure may be an independent DL HARQ procedure for unauthorized service cells and/or an auxiliary DL HARQ procedure for authorizing service cells. Therefore, the unlicensed serving cell should not have the maximum value of the independent DL HARQ procedure ( M _{DL_HARQ} ), and the maximum number of DL HARQ procedures for the LAA group should be considered together with the authorized serving cell and the unlicensed serving cell. In addition, the number of bits used to indicate the number of DL HARQ programs can also be extended for the LAA group. 17A-17G and its corresponding written description will provide several examples of the second exemplary embodiment.

In the following example of the second exemplary embodiment, the first transmission may be transmitted via an authorized service cell or an unauthorized service cell. And the retransmission can also be transmitted via the authorized service cell or the unauthorized service cell.

Figure 17A illustrates a first example when an authorized FDD service cell assists an unlicensed full DL serving cell with an LAA group having a maximum number of DL HARQ procedures ( M _{DL_HARQ} ). In this example, since the M _{DL_HARQ of the} authorized FDD DL serving cell 1701 will be considered together with the unlicensed full DL serving cell 1702, the maximum number of DL HARQ procedures for the LAA group will be the DL HARQ of the unlicensed full DL serving cell 1702. The maximum number of programs plus the maximum number of DL HARQ programs that authorize the FDD DL serving cell 1701. Since the maximum number of DL HARQ procedures for the serving cells 1701 and 1702 independently according to FIG. 4 is 8, the maximum number of DL HARQ procedures ( M _{DL_HARQ} ) of the LAA group will increase from 8 to 16. Therefore, since the number of bits (3 bits) for indicating the number of DL HARQ programs of the conventional FDD system will cover only 8 programs and thus is insufficient, the number of bits used to indicate the number of DL HARQ programs will also Extend from 3 bits to 4 bits.

Figure 17B is a second example illustrating when an authorized FDD service cell assists two unlicensed full DL serving cells, the LAA group having the maximum number of DL HARQ procedures ( M _{DL_HARQ} ). In this example, similar to the principle of Figure 17A, the maximum number of DL HARQ procedures for the LAA group ( M _{DL_HARQ} ) will be considered together with the authorized FDD service cells and the unlicensed full DL serving cells, which will contain the authorized FDD DL serving cells. 1711. The first unlicensed full DL serving cell 1712 and the second unlicensed full DL serving cell 1713, and since the maximum value M _{DL_HARQ} for all serving cells independently according to FIG. 4A is 8, the DL HARQ procedure of the LAA group The maximum number is extended from 8 to 24. Therefore, since the number of bits (3 bits) for indicating the number of DL HARQ programs of the conventional FDD system is insufficient, 5 bits are required to fully represent 24 possibilities, so the DL HARQ program for indicating the LAA group is used. The number of bits in the number should also be extended from 3 bits to 5 bits.

Figure 17C is a third example illustrating when a TDD service cell is authorized to assist an unlicensed TDD serving cell, the LAA group having a maximum number of DL HARQ procedures ( M _{DL_HARQ} ), wherein the two serving cells are configured with UL/DL configuration 0. In this example, the maximum number of DL HARQ procedures for the LAA group ( M _{DL_HARQ} ) will be considered together with the Authorized Service Cell 1721 and the Unauthorized Serving Cell 1722, and because it is used independently for the Authorized Serving Cell 1721 and the Unauthorized Serving Cell 1722. M _{DL_HARQ} is 4, so the maximum number of DL HARQ procedures for the LAA group is extended from 4 to 8 (4 + 4 = 8). For a conventional TDD system, the number of bits used to indicate the number of DL HARQ programs is 4 bits. In this example, since 4 bits are sufficient to indicate a maximum of 8 DL HARQ programs, the number of bits used to indicate the number of DL HARQ programs of the LAA group is not modified.

Figure 17D is a fourth example illustrating when a TDD service cell is authorized to assist an unauthorised TDD serving cell, the LAA group having a maximum number of DL HARQ procedures ( M _{DL_HARQ} ), wherein the two serving cells are configured with a UL/DL configuration 5. In this example, the maximum number of DL HARQ procedures ( M _{DL_HARQ} ) for the LAA group will be considered together with the Authorized Serving Cell 1731 and the Unauthorized Serving Cell 1732. Since the maximum value M _{DL_HARQ} for both the Authorization Service Cell 1731 and the Unauthorized Service Cell 1732 is 15 according to FIG. 4, the maximum number of DL HARQ procedures of the LAA group will be extended from 15 to 30 (15+15=30). ). Therefore, since the number of bits (4 bits) for indicating the number of DL HARQ programs of the conventional TDD system is insufficient, 5 bits are required to represent 30 possibilities, so the number of DL HARQ programs for indicating the LAA group is used. The number of bits should also be extended from 4 bits to 5 bits.

17E is a fifth example of the time when TDD service authorization service TDD cell helper cell is not authorized, which LAA group with the largest number (M DL_HARQ) _DL HARQ process, wherein the authorization service TDD cells arranged UL / DL configuration 0, and Unauthorized TDD service cells are configured with UL/DL configuration 5. In this example, the maximum number of DL HARQ procedures for the LAA group ( M _{DL_HARQ} ) will be considered together with the Authorized Serving Cell 1741 and the Unauthorized Serving Cell 1742. For the exemplary embodiment of FIG. 17E, the Authorization Service Cell 1741 will make an ACK or NACK (ACK/NACK) in subframe 4 of frame m after receiving the DL HARQ procedure in subframe 0 of frame m. Respond. The fastest retransmission of this particular DL HARQ procedure will occur in subframe 0 of frame m+1 of the Authorized Serving Cell 1741. Within 10 subframes (from subframe 0 to subframe 9 of frame m), there may be a maximum of 13 DL HARQ procedures containing 4 DL HARQ procedures and unauthorized services for the authorized serving cell 1741. Nine DL HARQ programs for cells 1742. The M _{DL_HARQ} of the LAA group in this exemplary embodiment is (4+9)=13.

FIG. 17F is a diagram when arranged UL / DL configuration TDD service authorization auxiliary cell 1751 0 1752 unauthorized sixth example when the DL serving cell whole, which LAA group with the largest number (M DL_HARQ) _DL HARQ process. In this example, the addition of M _{DL_HARQ} for authorizing service cell 1751 and unauthorized service cell 1752 is always 14 (4 + 10 = 14). Therefore, the maximum number of DL HARQ programs is extended from 4 to 14 which can be represented by 4 bits.

Figure 17G is a seventh example illustrating when the authorized FDD service cell 1761 assists in configuring the unlicensed serving cell 1762 with UL/DL configuration 0, the LAA group having the maximum number of DL HARQ procedures ( M _{DL_HARQ} ). In this example, the addition of M _{DL_HARQ} for authorizing service cell 1761 and unauthorized service cell 1762 is always 12 (8 + 4 = 12). Therefore, the maximum number of DL HARQ programs is extended from 4 to 12, which can be represented by 4 bits.

For the third exemplary embodiment, if more than one serving cell is to be The soft scratchpad partitioning rule of Figure 8 will be modified if one less service cell is deployed on the licensed spectrum and at least one service cell is deployed on the unlicensed spectrum. For legacy systems, the soft temporary storage area is divided independently for each serving cell, and thus each serving cell has a dedicated sub-block of the soft temporary storage area. One difference between the traditional CA mechanism and the present disclosure is the premise that unauthorized service cells are based on contention transmission and can limit the maximum transmission time on unauthorized service cells. Furthermore, the DL HARQ procedure transmitted on the unlicensed serving cell may be an independent DL HARQ procedure for the unlicensed serving cell and/or an auxiliary DL HARQ procedure for the authorized serving cell. In this way, the unlicensed service cell will not have a dedicated sub-block of the soft buffer area, and the LAA group should share the sub-block of the soft buffer area (eg, the LAA group's authorized and unauthorized service cell sharing soft) The same sub-block of the temporary storage area). Therefore, when more than one serving cell is configured for the UE or if at least one serving cell and/or the cell group is deployed in an unlicensed frequency band, a secondary cell group (SCG) is configured for the UE, the soft temporary storage area It will be divided according to the number of authorized service cells. Subsequently, when more than one serving cell is configured for the UE or if at least one serving cell and/or a group of cells deployed on the unlicensed band is configured for the UE, the soft buffer will be partitioned according to the steps illustrated in FIG. .

In step S1801, the soft temporary storage area is divided into a plurality of partitions according to the number of the plurality of partitions, wherein the size of the soft temporary storage area is N _soft .

In step S1802, according to at least the number of authorized service cells configured for the UE ( The maximum number of DL HARQ programs ( M _{DL_HARQ} ) and the comparison parameter ( M _limit ) determine the number of partitions.

The M _{DL_HARQ} parameter may be determined according to a DL-reference UL/DL configuration of the authorized serving cell, and/or if the authorized serving cell assists at least one unauthorized serving cell, the M may be determined according to a mechanism as proposed in the second exemplary embodiment _{DL_HARQ} .

M _limit is a constant or configurable parameter. The disclosure proposes to modify the M _limit from a conventional system based on the following.

If the authorization service cell assists at least one unauthorized service cell, M _limit can be set equal to K , where K 8. For example, as shown in FIG. 19A, if the authorization service is determined at least one cell helper cells unauthorized service 1901, M _limit is equal to 12; otherwise, M _limit is equal to 8.

It is also possible to determine the number of unauthorised serving cells in the LAA group 1902 (( ) Determine M _limit . For example, as shown in FIG. 19B, if the number of unauthorized service cells 1902 in the LAA group is 1, M _limit is 12; if the number of unauthorized service cells 1902 in the LAA group is 2, M _limit is 16. And if the number of unlicensed serving cells 1902 in the LAA group is greater than or equal to 3, then M _limit is 20.

M _limit can be transmitted through the network via higher layer signaling (for example, Radio Resource Control (RRC), System Information Block (SIB) or Master Information Block (MIB)) or Physical layer signaling (for example, Downlink Control Information (DCI)) for configuration.

It is also possible to determine M _limit based on the traffic load of the LAA group. For example, as shown in FIG. 19C, M _limit may be determined based on the traffic load 1903 of the unlicensed serving cell of the LAA group. If the traffic load 1903 of the unlicensed serving cell of the LAA group belongs to the highest category (eg, high 1904), the M _limit is set to 16; if the traffic load 1903 of the unlicensed serving cell of the LAA group belongs to the medium category (eg, In 1905), M _limit is set to 12; if the traffic load 1903 of the unlicensed serving cell of the LAA group belongs to the lowest category (for example, low 1906), M _limit is set to 8.

M _limit may also be determined by combining the concepts of FIG. 19B and FIG. 19C according to the traffic load of the unlicensed service cells of the LAA group and the number of unauthorized service cells of the LAA group. The combination diagram shown in Fig. 19D. The utilization of this figure is a combination of FIG. 19B and FIG. 19C and thus a description will not be required.

M _limit can also be determined based on the occlusion rate of unauthorized service cells in the LAA group. The M _limit can be determined according to Figure 19E. If the congestion rate of the unlicensed serving cell of the LAA group is high, then M _limit is set to 8; if the congestion rate of the unlicensed serving cell of the LAA group is medium, then M _limit is set to 12; if the LAA group The rate of congestion of unauthorized service cells is low, then M _limit is set to 16.

As an example, if Authorized service cells and The unlicensed service cells are configured to the UE, and the soft temporary storage is divided into multiple partitions, wherein Determine the size of multiple partitions, where N _soft is the size of the soft temporary storage area, Is the number of authorized service cells configured as UEs, M _{DL_HARQ} is the maximum number of DL HARQ procedures, M _limit is the comparison parameter and K _MIMO is the maximum number of transportable blocks that can transmit transport blocks to the UE in the TTI of the serving cell. For each authorized service cell and/or LAA group, up to min ( M _{DL_HARQ} , M _limit ) HARQ programs may be stored in the soft temporary storage area, and the soft temporary storage area size for each HARQ program is at least Soft channel bits, in addition, for each transport block within the HARQ program, the soft scratchpad size for each HARQ program is Soft channel bits.

For example, N _soft can be divided into multiple partitions for storing soft channel bits according to the following equation:

For FDD, TDD, and FDD-TDD, if more than one serving cell is configured to the UE or if the SCG is configured to the UE, for each serving cell, for at least ( K _MIMO . min ( M _{DL_HARQ} , M _limit )) transmissions Block, after decoding failure of the coding block of the transport block, the UE shall store the received soft channel bit corresponding to a range of at least n _SB soft channel bits, where: C is the code of the transport block (TB) The number of blocks.

N _cb is the size of the coding block of the transport block (TB).

K _MIMO is the maximum number of transport blocks that can be transmitted to a UE in the TTI of a serving cell.

M _limit is a positive value as previously introduced.

M _{DL_HARQ} is determined according to the DL-reference UL/DL configuration of the authorized serving cell, and/or the DL determined according to the value introduced in the second exemplary embodiment in the case where the authorizing service cell assists at least one unauthorized serving cell The maximum number of HARQ programs.

Is the number of authorized service cells configured across the mandatory cell group (MCG) and the SCG if the UE is configured with SCG; otherwise, Is the number of authorized service cells configured.

Min ( M _{DL_HARQ} , M _limit ) is to compare M _{DL_HARQ} and M _limit and return a smaller value of M _{DL_HARQ} and M _limit . Return no more than The largest integer.

20 through 23 illustrate various examples of the third proposed exemplary embodiment. Figure 20 illustrates that when the UE is configured with two authorized TDD service cells as shown in Figure 20 as component carriers (CC) #1 and CC #2 ( =2) and an unlicensed TDD service cell is CC#3 ( =1), a first example of a third exemplary embodiment of a soft scratchpad partition, wherein one of the plurality of authorized TDD service cells assists an unauthorized TDD serving cell. The authorized TDD service cell CC#2 and the unlicensed service cell CC#3 together form an LAA group. In this example, the maximum number (M DL_HARQ) _DL HARQ process configuration is determined according to the authorization service reference cells DL- UL / DL. Since each serving cell is configured with UL/DL configuration 0, the DL-reference UL/DL configuration of the authorized serving cell is UL/DL configuration 0. In other words, the M _{DL_HARQ of the} LAA group is _determined according to UL/DL configuration 0 and is equal to 4 for the authorized service cell. Therefore, the soft temporary storage area is divided by applying the concept of FIG.

In step S1801, the soft temporary storage area is divided into a plurality of partitions according to the number of the plurality of partitions, wherein the size of the soft temporary storage area is N _soft .

In step S1802, at least according to the number of authorized service cells ( = 2), the maximum number of DL HARQ programs ( M _{DL_HARQ} = 4) and the comparison parameter ( M _limit ) determine the number of partitions. In addition, soft temporary storage is divided into soft temporary storage areas. Sub-blocks. And each sub-block of the soft temporary storage area is divided into min ( M _{DL_HARQ} , M _limit ) partitions for the HARQ program, wherein each partition for the HARQ program has a size , Which in this example, according to the reference DL- UL grant service cells _(M DL_HARQ = 4) is / DL configurations determine LAA group _M DL_HARQ. In this example, M _limit is equal to 8. Therefore, each partition used for the HARQ program has a size . Due to the soft temporary storage area partition, the entire soft temporary storage is divided into 8 partitions, wherein partitions 1-1, 1-2, 1-3 and 1-4 are used for CC#1 and partitions 2-1, 2-2, 2 -3 and 2-4 are shared between CC#2 and CC#3.

Figure 21 illustrates when the UE is configured with two authorized TDD service cells as CC#1 and CC#2 ( =2) and an unlicensed TDD service cell is CC#3 ( =1), a second example of a third exemplary embodiment of a soft scratchpad partition, wherein one of the plurality of authorized TDD service cells assists the unauthorised TDD service cell and authorizes the TDD service cell CC#2 and is not authorized The TDD serving cell CC#3 forms a LAA group. In this example, if the authorization service unauthorized service cell helper cells, is to determine the maximum number (M DL_HARQ) _DL HARQ procedure according to the value of the LAA group introduced in the second exemplary embodiment. Since each cell is configured with the service UL / DL configuration 0, so the maximum number (M DL_HARQ) CC # _DL HARQ program authorization service cell of the reference configuration determined depending DL- UL / DL and described in accordance with FIG. 17C The instance determines the maximum number of DL HARQ procedures ( M _{DL_HARQ} ) for the LAA group (CC #2 and CC #3). In other words, for CC#1, M _{DL_HARQ} = 4, and for LAA groups (CC#2 and CC#3), M _{DL_HARQ} = 8. Therefore, the soft temporary storage area is divided by applying the concept of FIG. 18 as follows.

In step 1801, at least one sub-block of the soft temporary storage area is divided into a plurality of partitions according to the number of the plurality of partitions.

In step S1802, at least according to the number of authorized service cells ( = 2), the maximum number of DL HARQ programs ( M _{DL_HARQ} ) and the parameter ( M _limit ) determine the number of multiple partitions. In addition, soft temporary storage is divided into soft temporary storage areas. Sub-blocks. And each sub-block of the soft temporary storage area is divided into min ( M _{DL_HARQ} , M _limit ) partitions for the HARQ program, wherein each partition for the HARQ program has a size Where, in this example, for CC#1, M _{DL_HARQ} = 4 and for LAA groups (CC#2 and CC#3), M _{DL_HARQ} = 8. In this example, M _limit is equal to 8. Therefore, for CC#1, each partition used for the HARQ program has a size . For the LAA group (CC#2 and CC#3), each partition for the HARQ program has a size . As a result of the partition, partitions 1-1, 1-2, 1-3, and 1-4 are allocated for CC#1, and partitions 2-1, 2-2, 2-3, 2-4, 2-5, 2-6, 2-7, and 2-8 are allocated for CC#2 and CC#3 and are shared between CC#2 and CC#3. Authorized service cells and unauthorized service cells will share the same partition space.

Figure 22 illustrates that when the UE is configured with two authorized FDD service cells, CC#1 and CC#2 ( =2) and unauthorized full DL service cells are CC#3 ( =1), a third example of the third exemplary embodiment of the soft scratchpad partition. In this example, if the authorization service cell assists the unlicensed serving cell, the maximum number of DL HARQ procedures ( M _{DL_HARQ} ) of the LAA group is determined according to the value introduced in the second exemplary embodiment; The rules of FDD shown in 4 determine the maximum number of DL HARQ procedures ( M _{DL_HARQ} ) for the authorized serving cell CC #1 and LAA groups (CC #2 and CC #3). In other words, for CC#1 and LAA groups (CC#2 and CC#3), M _{DL_HARQ} =8. Therefore, the soft temporary storage area is divided by applying the concept of FIG.

In step S1801, the soft temporary storage area is divided into a plurality of partitions according to the number of the plurality of partitions, wherein the size of the soft temporary storage area is N _soft .

In step S1802, at least according to the number of authorized service cells ( = 2), the maximum number of DL HARQ programs ( M _{DL_HARQ} ) and the comparison parameter ( M _limit ) determine the number of partitions. In addition, soft temporary storage is divided into soft temporary storage areas. Sub-blocks. And each sub-block of the soft temporary storage area is divided into min ( M _{DL_HARQ} , M _limit ) partitions for the HARQ program, wherein each partition for the HARQ program has a size , in this example, for CC#1 and LAA groups (CC#2 and CC#3), M _{DL_HARQ} =8. In this example, M _limit is equal to 8. Therefore, for CC#1, each partition used for the HARQ program has a size . For the LAA group (CC#2 and CC#3), each partition for the HARQ program has a size . As a result of the partition, partitions 1-1, 1-2, 1-3, 1-4, 1-5, 1-6, 1-7, and 1-8 are allocated for CC#1, and partition 2-1, 2-2, 2-3, 2-4, 2-5, 2-6, 2-7, and 2-8 are allocated for CC#2 and CC#3 and are shared between CC#2 and CC#3. Authorized service cells and unauthorized service cells will share the same partition space.

Figure 23 illustrates when the UE is configured with two authorized FDD service cells as CC#1 and CC#2 ( =2) and an unlicensed full DL service cell for CC#3 ( =1), a fourth example of the third exemplary embodiment of the soft scratchpad partition. In this example, if the authorization service is not cell helper cells authorization service, it is determined that the maximum number (M DL_HARQ) _DL HARQ procedure according to the value of the LAA group introduced in the second exemplary embodiment, and thus in accordance with FIG. 4A rule shown in FDD to determine the maximum number of authorized service cell CC # DL HARQ process 1 _(M DL_HARQ) and determine LAA group (CC # 2, and CC # 3) according to the illustrated example of FIG. 17A DL HARQ The maximum number of programs ( M _{DL_HARQ} ). In other words, for CC#1, M _{DL_HARQ} = 8, and for LAA groups (CC#2 and CC#3), M _{DL_HARQ} =16. Therefore, the soft temporary storage area is divided by applying the concept of FIG.

In step S1801, the soft temporary storage area is divided into a plurality of partitions according to the number of the plurality of partitions, wherein the size of the soft temporary storage area is N _soft .

In step S1802, at least according to the number of authorized service cells ( = 2), the maximum number of DL HARQ programs ( M _{DL_HARQ} ) and the comparison parameter ( M _limit ) determine the number of partitions. In addition, soft temporary storage is divided into soft temporary storage areas. Sub-blocks. And each sub-block of the soft temporary storage area is divided into min ( M _{DL_HARQ} , M _limit ) partitions for the HARQ program, wherein each partition for the HARQ program has a size , Wherein for _CC # 1, M DL_HARQ = 8 and for LAA group (CC # 2, and _{CC # 3), M DL_HARQ =} 16. In this example, M _{limit is} determined according to Fig. 19A. Thus for CC#1, M _limit is equal to 8 and for LAA groups (CC#2 and CC#3), M _limit is equal to 12.

Therefore, each partition used for the HARQ program has a size

For CC#1, the partition size is .

For LAA groups (CC#2 and CC#3), the partition size is . As a result of the partition, partitions 1-1, 1-2, 1-3, 1-4, 1-5, 1-6, 1-7, and 1-8 are allocated for CC#1, and partition 2-1, 2, 2, 2-3, 2-4, 2-5, 2-6, 2-7, 2-8, 2-9, 2-10, 2-11, and 2-12 are allocated for CC#2 and CC#3 is shared between CC#2 and CC#3. Authorized service cells and unauthorized service cells will share the same partition space.

The present disclosure proposes a fourth exemplary embodiment of determining a HARQ ACK or NACK (ACK/NACK) feedback timeline. In the prior art, the UE may transmit the PDSCH HARQ ACK/NACK in the subframe number n to report the PDSCH transmission indicated by the corresponding PDCCH in the subframe number nk, where k K and k are positive integers as stated in Table 10.1.3.1-1 in TS 36.213. For serving cell C, the UE will transmit the PDSCH HARQ ACK/NACK in subframe n to report the PDSCH transmission indicated by the corresponding PDCCH in subframe nk, where k Kc . Kc is determined based on its DL-reference UL-DL configuration and subframe number. For PCell, the DL-reference UL/DL configuration is the configuration of the PCell. For SCell, the DL-reference UL/DL configuration is determined according to Table 10.2-1 in TS 36.213. The DL-reference UL/DL configuration for serving cells based on a pair formed by the primary cell UL/DL configuration and the secondary cell UL/DL configuration is set forth in Table 10.2-1 in TS 36.213. For example, when two service cells configured with the UL/DL configuration 0 and the SCell configured with the UL/DL configuration 5 are configured to the UE, the PDSCH HARQ ACK/NACK for the PCell follows the UL/DL configuration 0, and for the SCell The PDSCH HARQ ACK/NACK feedback timeline follows the UL/DL configuration. However, in order to facilitate the feedback of DL HARQ ACK/NACK and to rebalance the uplink control overhead, the present disclosure proposes a DL HARQ ACK/NACK feedback timeline for modifying the LAA group and modifying the existing downlink of each UL/DL configuration. A new guideline for path association set indexing.

In the fourth exemplary embodiment, if the retransmission can be transmitted in another serving cell, the DL hybrid automatic response request acknowledgement or negative acknowledgement (HARQ ACK or NACK) feedback time axis will be modified.

For a legacy CA system, a DL HARQ ACK or NACK (ACK/NACK) feedback timeline corresponding to a DL HARQ procedure that has been received in the serving cell is determined according to the DL-reference UL/DL configuration of the serving unit. If at least one serving cell is configured with a different UL/DL configuration, then at least one serving cell will have a different DL-reference UL/DL configuration. In this way, the DL HARQ ACK/NACK feedback timeline for PCell and SCell can be different for a traditional TDD CA system. For the fourth exemplary embodiment, since different UL/DL configurations are configured for different serving cells, DL HARQ ACK/NACK feedback corresponding to the same subframe may be transmitted on different subframes.

A difference between the fourth exemplary embodiment and the conventional CA mechanism is that if the non-contention based authorization service cell assists at least one unauthorized service cell based on contention, the DL HARQ procedure transmitted on the unlicensed serving cell It may be an independent DL HARQ procedure for unauthorized service cells and/or a secondary DL HARQ procedure for authorizing service cells. Therefore, for the LAA group, DL HARQ ACK/NACK feedback corresponding to the same subframe is expected to be transmitted on the same subframe. Thus, although more than one serving cell is configured for the UE or if a secondary cell group (SCG) that deploys at least one serving cell and/or cell group on the unlicensed band is configured for the UE, the DL HARQ ACK/NACK of the LAA group The feedback timeline will be modified accordingly according to the following three rules: The first rule is that if the subframe n is a downlink subframe for both authorized and unauthorised serving cells, the corresponding DL HARQ ACK/NACK feedback is provided by the UE. Transfer in the same UL subframe.

The second rule is that the DL HARQ ACK/NACK corresponding to the DL subframe of the unlicensed serving cell is distributed as evenly as possible on the UL subframe of the authorized serving cell.

The third rule is that the DL HARQ ACK/NACK feedback corresponding to the DL subframe n of the unlicensed serving cell is transmitted on the uplink subframe closest to the subframe n + c , where c is a constant, eg, c =4.

24 illustrates an application of the above rule in an example of the DL HARQ ACK/NACK feedback timeline of the proposed fourth exemplary embodiment, which is assumed to have an authorized service cell configured with UL/DL configuration 0 and configured with UL /DL configuration 5 of the TDD CA system for unauthorized service cells. Therefore, the DL-reference UL/DL configuration of the authorized serving cell is UL/DL configuration 0 and the DL-reference configuration of the unlicensed serving cell is determined by the downlink association set index as shown in FIG. 25, which is the downlink A modified version of the associated collection index chart. In an embodiment, since the UE can receive the DL HARQ procedure in the subframe 0 of the frame m of the two serving cells, the UE can transmit the DL HARQ of the two serving cells on the subframe 4 of the frame m . The DL HARQ ACK/NACK feedback corresponding to the program.

It can be noted that the proposed service cells in the LAA group are presented The DL HARQ ACK/NACK feedback timeline is different from the conventional cross-band CA communication system. In the conventional cross-band CA communication system, if the downlink is received in the subframe 9 of the frame m-1 and the subframes 0, 1, 3, 4, 5, 6, 7, 8 of the frame m For transmission, the corresponding ACK/NACK will be transmitted only in subframe 2 of frame m+1. For the DL HARQ ACK/NACK feedback timeline 2401 of the Authorized Service Cell, the PDSCH HARQ ACK/NACK feedback timeline follows UL/DL Configuration 0, as shown in FIG. However, according to the fourth exemplary embodiment, the DL HARQ ACK/NACK feedback time axis 2402 of the unlicensed serving cells is different. In FIG. 24, if a HARQ ACK/NACK is transmitted in the subframe index 2 of the frame m, the corresponding downlink transmission will be received in the subframe 6 and/or 7 of the frame m-1; If the HARQ ACK/NACK is transmitted in the subframe index 3 of the frame m, the corresponding downlink transmission will be received in the subframe 8 and/or 9 of the frame m-1; if the subframe is in the frame m If the HARQ ACK/NACK is transmitted in the frame index 4, the downlink transmission will be received in the subframe 0 of the frame m; if the HARQ ACK/NACK is transmitted in the subframe 8 of the frame m, The subframe 3 and/or 4 of the frame m receive the corresponding downlink transmission; and if the HARQ ACK/NACK is transmitted in the subframe index 9 of the frame m, the subframe of the frame m will be 5 receives the corresponding downlink transmission.

Thus, for unlicensed serving cells in the LAA group, the DL HARQ ACK/NACK feedback timeline can be modified according to the above rules, wherein the DL HARQ ACK/NACK feedback timeline is determined from the downlink association set index. For a UE configured with at least one authorized TDD serving cell and at least one unlicensed TDD serving cell, the UE will transmit DL HARQ ACK/NACK feedback in response to at least one DL PDSCH transmission in subframe n to report by subframe. DL HARQ transmission indicated by a corresponding DL control channel (eg, PDCCH or ePDCCH) within nk , where k K _i and is related to the UL/DL configuration of the unlicensed serving cell and i is related to the UL/DL configuration of the authorized serving cell. For example, when the TDD UL/DL configuration i is configured to an authorized service cell, the downlink association set index of the unlicensed serving cell is determined by K _i . In general, when UL/DL configurations 0, 1, 2, 3, 4, 5, and 6 are configured for authorized service cells, the application of the above three rules will require the downlink association set index ( K _i ) to be modified. The modifications shown in the figure below.

FIG. 26 illustrates a downlink association set index K ₁ when the grant service cell is configured with UL/DL configuration ₁ : { k ₀ , k ₁ , ... , k _{M -1} }. 27 illustrates a downlink association set index K ₂ when a grant service cell is configured with UL/DL configuration ₂ : { k ₀ , k ₁ , ... , k _{M -1} }. FIG. 28 illustrates a downlink association set index K ₃ when a grant service cell is configured with UL/DL configuration ₃ : { k ₀ , k ₁ , ... , k _{M -1} }. 29 illustrates a downlink association set index K ₄ when a grant service cell is configured with UL/DL configuration ₄ : { k ₀ , k ₁ , ... , k _{M -1} }. FIG. 30 illustrates a downlink association set index K ₅ when the authorizing service cell is configured with the UL/DL configuration ₅ : { k ₀ , k ₁ , ... , k _{M -1} }. Figure 31 illustrates the downlink association set index K ₆ when the grant service cell is configured with the UL/DL configuration ₆ : { k ₀ , k ₁ , ... , k _{M -1} }.

For enhanced CA, data offload and coexistence with other unlicensed spectrum deployments will become increasingly important for future LTE deployments to handle increased throughput and capacity requirements. Thus, for enhanced CA, at least one service cell is deployed on an unlicensed band that supports competing communications and at least one service cell is deployed in a non-based On the licensed band of competing communications (eg, LTE-LAA). The present disclosure provides a mechanism to fulfill the implementation of the communication operation of the LTE-LAA.

In view of the foregoing description, the present disclosure is suitable for use in a wireless communication system and can provide a method of handling communication operations in a communication system. Authorized and unauthorized service cells may be considered to be a Licensed-Assisted Access (LAA) group if the authorized service cell assists at least one unauthorized service cell.

In the first of the proposed exemplary embodiments, the present disclosure proposes that retransmission can be transmitted on one of the configured service cells of the LAA group.

In the second of the proposed exemplary embodiments, the present disclosure proposes a maximum number of DL HARQ procedures that collectively consider the LAA group.

In a third of the proposed exemplary embodiments, a soft temporary storage partitioning mechanism is proposed for sharing authorized and unauthorized service cells of the same sub-block of the soft temporary storage area. In this way, the partition of the soft scratchpad can operate efficiently and can increase the performance of HARQ retransmission.

In the fourth proposed exemplary embodiment, the DL HARQ ACK or NACK (ACK/NACK) feedback time axis of the LAA group and the corresponding downlink association set index are modified. In this way, feedback of DL HARQ ACK/NACK will occur as soon as possible and the uplink control overhead will be properly equalized.

The elements, acts, or instructions in the specific embodiments of the disclosed embodiments of the present application should not be construed as being critical or essential to the present disclosure unless explicitly described. Moreover, as used herein, the indefinite article "a" and "an" If only Looking for a project, the term "single" or similar language will be used. Further, as used herein, the term "any of" preceding a plurality of items and/or a list of a plurality of item categories is intended to include the item and/or item type individually or in combination with other items and/or Or any of the other item categories "anything", "any combination", "any of the plurality", and/or any combination of the plurality. Moreover, as used herein, the term "set" is intended to encompass any number of projects, including zero. Also, as used herein, the term "number" is intended to include any number, including zero.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

S1601~S1604‧‧‧Steps

Claims (53)

A method of processing a communication operation by a mobile device in a wireless communication system, the method being applicable to the mobile device configured with a plurality of service cells through a network of the wireless communication system, wherein the plurality of service cells include a first serving cell and a second serving cell, the method comprising: receiving, by the first serving cell, a first transmission in a first subframe and decoding the first transmission; Decoding the first transmission to generate a decoding result; transmitting an acknowledgement or a negative acknowledgement in a second subframe, wherein the acknowledgement or negative acknowledgement corresponds to the decoding result; and via the second service The cell receives a second transmission in a third subframe, wherein the second transmission is a retransmission of the first transmission, wherein the first serving cell and the second serving cell are different. The method of claim 1, wherein the first serving cell is an authorized serving cell or an unauthorized serving cell. The method of claim 1, wherein the second serving cell is an authorized serving cell or an unauthorized serving cell. The method of claim 1, wherein the second sub-frame is after the first sub-frame. The method of claim 1, wherein the third sub-frame is after the second sub-frame. The method of claim 1, the method further comprising: if the first transmission is not successfully decoded, at least one soft channel bits of the first transmission Stored in at least one partition of the soft scratchpad. The method of claim 6, wherein the method further comprises: at least , M _{DL_HARQ} , and M _limit divide the soft temporary storage into a plurality of partitions, wherein the N _soft is a size of the soft temporary storage area, Is the number of authorized service cells configured for the mobile device, the M _{DL_HARQ} being the maximum number of Hybrid Automatic Repeat reQuest (HARQ) procedures and the M _limit being a constant or configurable parameter. The method of claim 7, wherein the soft temporary storage area is divided according to the following equation: Where the N _soft is the size of the soft temporary storage area, Is the number of authorized service cells configured for the mobile device, the M _{DL_HARQ} is the maximum number of downlink hybrid automatic repeat request procedures, the M _limit is a constant or configurable parameter, and the K _MIMO is a per-transmission time interval The maximum number of transport blocks that can be transferred to the mobile device. The method of claim 7, wherein the M _{limit is} determined based on whether the authorized service cell assists an unauthorized service cell. The method of claim 9, wherein the M _limit is 12 if the authorizing service cell assists the unauthorized serving cell. The method of claim 7, wherein the M _limit is determined based on a number of unauthorized service cells configured to the mobile device. The method of claim 11, wherein the M _limit is 12, 16, or 20 if the number of unauthorized service cells configured for the mobile device is 1, 2, or 3, respectively. The method of claim 7, wherein the M _{limit is} determined based on a traffic load category of unauthorized service cells. The method of claim 13, wherein the M _limit is 16, 12, and 8 if the traffic load categories of the unauthorized service cells are high, medium, and low, respectively. The method of claim 7, wherein the M _limit is determined based on a tamping rate of unauthorised serving cells. The method of claim 15, wherein the M _limit is 8, 12, and 16 if the clogging rates of the unlicensed serving cells are high, medium, and low, respectively. The method of claim 7, wherein the M _limit is determined based on a traffic load category of at least one unauthorized service cell and at least one configured unlicensed service cell number. The method of claim 7, wherein the M _limit is configured via higher layer signaling or physical layer signaling over the network. The method of claim 18, wherein the higher layer signaling is through a Radio Resource Control (RRC), a System Information Block (SIB), or a Master Information Block (Master Information). Block, MIB) transmission. The method of claim 18, wherein the entity layer signaling is transmitted through Downlink Control Information (DCI). The method of claim 7, wherein the first serving cell and the second serving cell share the M _{DL_HARQ} . The method of claim 21, wherein if the first serving cell is a frequency division duplex downlink serving cell and the second serving cell is a full downlink serving cell, M _{DL_HARQ} is 16. The method of claim 22, wherein the M _{DL_HARQ} is 24 if the mobile device is further configured to a third serving cell. The method of claim 21, wherein if the uplink/downlink configuration 0 is configured to both the first serving cell and the second serving cell, the M _{DL_HARQ} is 8. The method of claim 21, wherein if the uplink/downlink configuration 5 is configured to both the first serving cell and the second serving cell, the M _{DL_HARQ} is 30. The method of claim 21, wherein if the uplink/downlink configuration 0 is configured to the first serving cell and the uplink/downlink configuration 5 is configured to the second service For cells, the M _{DL_HARQ} is 13. The method of claim 21, wherein if the uplink/downlink configuration 0 is configured to the first serving cell and the second serving cell is a full downlink serving cell, The M _{DL_HARQ} is 14. The method of claim 21, wherein the first serving cell is configured as a frequency division duplex downlink serving cell and the uplink/downlink configuration 0 is configured to the second service For cells, the M _{DL_HARQ} is 12. The method of claim 1, wherein if the second sub-frame is a sub-frame having a sub-frame number n, the first sub-frame is a sub-frame number nk Frame, where k is a positive integer. The method of claim 29, wherein the k is a constant. The method of claim 29, wherein the k K and the K is a downlink association set index including at least one element. The method of claim 31, wherein if the uplink/downlink configuration 0 is configured for the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 31, wherein if the uplink/downlink configuration 1 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 31, wherein if the uplink/downlink configuration 2 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 31, wherein if the uplink/downlink configuration 3 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 31, wherein if the uplink/downlink configuration 4 is configured for the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 31, wherein if the uplink/downlink configuration 5 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 31, wherein if the uplink/downlink configuration 6 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . A method of processing a communication operation by a mobile device in a wireless communication system for a network of a wireless communication system, the method being adapted to configure a plurality of service cells to the network of the mobile device, wherein The plurality of service cells include a first serving cell and a second serving cell, the method comprising: transmitting a first transmission in a first subframe via the first serving cell; in a second sub Receiving, by the frame, an acknowledgement or a negative acknowledgement, wherein the acknowledgement or negative acknowledgement corresponds to the first transmission; and transmitting a second transmission in a third subframe via the second serving cell, wherein The second transmission is a retransmission of the first transmission, wherein the first serving cell and the second serving cell are different. The method of claim 39, wherein the first serving cell is an authorized serving cell or an unauthorized serving cell. The method of claim 39, wherein the second serving cell is an authorized serving cell or an unauthorized serving cell. The method of claim 39, wherein the second subframe is after the first subframe. The method of claim 39, wherein the third subframe is after the second subframe. The method of claim 39, wherein if the second sub-frame is a sub-frame having a sub-frame number n, the first sub-frame is a sub-frame number nk Frame, where k is a positive integer. The method of claim 44, wherein the k is a constant. The method of claim 44, wherein the k K and the K is a downlink association set index including at least one element. The method of claim 46, wherein if the uplink/downlink configuration 0 is configured for the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 46, wherein if the uplink/downlink configuration 1 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 46, wherein if the uplink/downlink configuration 2 is configured for the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 46, wherein if the uplink/downlink configuration 3 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 46, wherein if the uplink/downlink configuration 4 is configured for the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 46, wherein if the uplink/downlink configuration 5 is configured to the first serving cell, the downlink association set index (K) is determined according to the following table: . The method of claim 46, wherein if the uplink/downlink configuration 6 is configured for the first serving cell, the downlink association set index (K) is determined according to the following table: .