CN1661952A - Equipment and method for controlling retransmission data ROT - Google Patents

Abstract

A method for controlling the ROT of retransmission data, in the rate scheduling mode, includes the steps: when the Node B receives the data from the UE, it decodes, if the decoding is incorrect, the Node B sends a NACK to the UE, requiring the UE to retry Data transmission; when retransmitting data, Node B determines the change of the target ROT of the retransmission data; Node B uses the scheduling command RG to indicate the maximum rate that the UE is allowed to use during retransmission; the UE sends the corresponding retransmission according to the Node B The scheduling command RG calculates the virtual transmission format combination, so as to derive the transmission power of the E-DPDCH channel during retransmission; UE uses the same transmission format combination as the first transmission, and uses the derived E-DPDCH channel during retransmission transmit power to send retransmission data. Node B decides the expected ROT during retransmission according to the ROT of the current base station and the power required for correct decoding of E-DPDCH, and indicates it through the physical layer scheduling command. When the scheduling signaling is retransmitted, it no longer indicates the actual transmission rate, but indicates the virtual transmission rate that the Node B expects the UE to achieve.

Description

Device and method for controlling retransmission data ROT

technical field

The present invention relates to the third-generation mobile communication, and in particular to a device and a method for Node B to flexibly control ROT (Noise rise over thermal noise) of data that needs to be retransmitted in EUDCH.

Background technique

The second generation mobile communication system includes GSM (Global System for Mobile Communications) and IS (Interim Standard)-95, the main goal is to provide voice services. GSM adopts TDMA (Time Division Multiple Access) technology, which was commercialized in 1992 and is mainly used in Europe and China. What IS-95 uses is code division multiple access technology, mainly used in the United States and South Korea.

At present, mobile communication technology has evolved into the third generation mobile communication system, which provides high-speed and high-quality data services and multimedia services in addition to voice services. The third-generation mobile communication system includes the asynchronous CDMA system (or WCDMA system, or UMTS) studied by the 3GPP ( ^3rd Generation Project Partnership) International Organization for Standardization, that is, the timing between the base stations is asynchronous, and 3GPP2 (3rd ^Generation Project Partnership) Generation Project Partnership 2) The synchronous CDMA system (or CDMA2000) studied by the International Organization for Standardization, that is, the timing between the base stations is the same.

Both synchronous and asynchronous third-generation mobile communication systems are standardizing on providing high-speed, high-quality data packet services. For example: 3GPP is standardizing HSDPA (High Speed Downlink Access) to increase the downlink data rate, while 3GPP2 is standardizing 1xEV-DV (Evolution-Data and Voice). 3GPP continues to enhance the transmission of uplink packet data (EUDCH), so as to improve the capacity and coverage of uplink. Compared with the uplink DCH of Re199/4/5, EUDCH has introduced the HARQ (Hybrid Automatic Retransmission Request) mechanism, and is considering using a shorter TTI (Transmission Time Interval) than the uplink DCH of Re199/4/5, for example, the same as HSDPA is 2ms. TTI is defined as the time interval during which a transport channel transmits data to a physical channel. Uplink EUDCH tends to use power control for link adaptation (3GPP is under study), while HSDPA uses AMC method for link adaptation.

Correspondingly, it is necessary to schedule the uplink channel of each cell in order to allocate resources. EUDCH moves the scheduling function from RNC to Node B to realize fast scheduling. The purpose of uplink scheduling is to effectively utilize limited radio resources. For example, the target ROT (T_ROT) of each cell is determined by the uplink channel scheduling of the cell, and an optimal T_ROT can be found according to the status of the cell and neighboring cells. When the uplink channel scheduling makes the actual measured M_ROT When it is less than or equal to T_ROT and the change of M_ROT is small, the uplink of the system can obtain the best performance. The definition of ROT is shown in formula (1):

$\mathrm{<span\; class="notranslate">\; ROT</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, Io is the sum of all signal strengths received by Node B, that is, the full broadband received signal power spectral density of Node B, and No is the power spectral density of thermal noise of Node B.

Because No hardly changes over time, ROT is mainly determined by Io. If the ROT is small, it means that the signal strength received by Node B is weak. Although the interference received by the terminal is small, the load on Node B is also small. However, if the ROT is large, it means that the Node B has a high load, but it also means that the uplink of the terminal is greatly interfered, which leads to a decrease in uplink performance, thereby reducing the uplink performance of the entire system. Weigh the ROT and the performance of the whole system, and the optimal ROT for the best performance of the whole system can be obtained by comprehensively considering the load of Node B and the noise intensity of the terminal.

Currently, two scheduling methods are mainly proposed in TR25.896: one is rate scheduling based on Node B control, and the other is rate and time scheduling based on Node B control.

In the rate scheduling method based on Node B control, RNC sets the TFCS subset (TFCS Subset) that Node B is allowed to use, and informs Node B through NBAP signaling. The Node B sets the TFCS subset (TFCS Subset) that the UE is allowed to use, and informs the UE through physical layer signaling. The TFCS subset allowed to be used by the Node B includes the TFCS subset allowed to be used by the UE. Compared with the uplink dedicated channel control of Re199/4/5, the scheduling based on Node B control can change the TFCS subset allowed to be used by the UE in each scheduling cycle, so as to adapt to the change of uplink load and achieve the purpose of fast scheduling.

Because the TFCs in the TFCS can be sorted according to the rate, each TFCS subset is represented by a pointer. The subset allowed by Node B is indicated by a Node B pointer (Node B pointer). The Node B pointer points to a certain TFC, and all elements whose transmission rate is less than or equal to the TFC belong to the subset allowed by Node B. Similarly, the UE pointer (UE pointer) points to a TFC with the highest transmission rate in the TFCS subset that the UE is allowed to use. See Figure 8, which is an illustration of Node B pointers and UE pointers. In the figure, there are 11 TFCS defined by the RNC, and they are TFC10, TFC9, TFC8, . The UE pointer is TFC7, so the TFCS subset that the UE is allowed to use is TFC7 to TFC10. The Node B pointer is TFC3, so the TFCS subset that Node B allows for the UE is TFC3 to TFC10.

The UE can calculate the current TFC to be used in the TFCS subset allowed by the UE according to the existing TFC selection algorithm in Re199, that is to say, the maximum transmission rate that the UE can use is the TFC pointed to by the UE pointer.

Figure 1 describes the specific operation of the rate scheduling method based on Node B control.

In step 101, the current rate of the UE is equal to the maximum TFC in the TFCS subset allowed by the UE. If the UE still wishes to increase the rate, it sends a rate increase request RR (Rate Request) to the Node B; otherwise, it sends a DTX.

In step 102, the Node B decides whether to allow the UE to increase or decrease the rate when sending new data according to the UE's rate request RR and Node B's current ROT in step 101, and sends a scheduling command for the first transmission of new data to the UE RG (Rate Grant), that is, RG=UP means that the UE is allowed to increase the rate; RG=DOWN means that the UE is ordered to reduce the rate; RG=DTX means that the UE rate remains unchanged.

In step 103, according to the received scheduling command of Node B in step 102, the UE selects a suitable TFC to send data to the Node B in the TFCS subset allowed by the UE according to the TFC selection algorithm.

In step 104, after Node B receives the UE data from step 103, it decodes it.

In step 105, if the decoding is correct, the Node B sends an ACK to the UE; if the decoding is incorrect, the Node B sends a NACK to the UE.

If in step 105, what Node B sends to UE is ACK, then UE turns to step 101 after receiving it, and prepares to send new data; if in step 105, what Node B sends to UE is NACK, then UE turns to step 101 after receiving it Step 106.

In step 106, when the UE retransmits data, the Node B does not schedule the retransmission data, but reserves the same ROT for the UE's retransmission data as the first transmission, and the UE transmits at the same rate as the first transmission. After step 106 is executed, turn to step 104.

In the rate and time scheduling based on NodeB control, before data transmission, the UE needs to send the information used by the Node B scheduling algorithm (such as buffer status and power headroom) to the Node B for data transmission requests. B calculates the quality of the UE's wireless channel based on the received information, and performs unified scheduling according to the current ROT situation. The Node B tells the UE at what rate and when to transmit data through physical layer signaling.

Figure 2 describes the specific operation of the rate and time scheduling method based on Node B control.

In step 201, when new data arrives at the buffer of the UE from the upper layer, the UE sends SI (Scheduling Information) for scheduling to the Node B, including the data size of the buffer and the transmit power headroom.

In step 202, the Node B sends the scheduling command SA (Scheduling Assignment) for the first transmission of new data to the UE according to the scheduling information (SI) of the UE in step 201 and the current ROT situation, and sends the maximum TFC of the TFCS subset allowed by the UE (sorted according to the transmit power corresponding to the TFC from small to large) and the time when the UE sends data.

In step 203, according to the scheduling command received from Node B in step 202, the UE selects a suitable TFC from the TFCS subset allowed by the UE according to the TFC selection algorithm and sends data to the Node B within the time specified by the Node B.

In step 204, Node B performs decoding after receiving the data first transmitted by UE in step 203.

In step 205, if the decoding is correct, the Node B sends an ACK to the UE; if the decoding is incorrect, the Node B sends a NACK to the UE.

If in step 205, what Node B sends to UE is ACK, then UE turns to step 201 after receiving it, and prepares to send new data. If in step 205, what Node B sends to UE is NACK, turn to step 206.

In step 206, the Node B does not schedule the retransmission data, but reserves the same ROT for the UE's retransmission data as the first transmission, and the UE transmits at the same rate as the first transmission. After step 206 is executed, turn to step 204 .

The two existing scheduling methods in TR25.896 both schedule the first transmission, that is, the rate of retransmission is the same as that of the first transmission, and from the perspective of Node B, the contribution of UE's retransmission and first transmission to ROT is the same , that is, the received power of the retransmission and the first transmission on the Node B side are the same. In this way, the Node B side must reserve the same ROT as the first transmission for the UE that needs to retransmit data, and then allocate the remaining ROT to other UEs that need to transmit data for the first time, so that the priority of retransmission data is higher than that of the first transmission. class. In addition, Node B does not schedule retransmissions, which reduces the accuracy of scheduling. In addition, if the superimposed energy of several retransmissions received by Node B and the first transmission is greater than the energy required for correct decoding, it will bring more unnecessary uplink interference to the system, thereby reducing system performance.

Contents of the invention

The purpose of the present invention is to provide a device and method for flexibly controlling the ROT of retransmitted data, so that the Node B can flexibly control the ROT of the retransmitted data and the first transmitted data, so that the retransmitted data and the first transmitted data can have different ROTs, but The data rate is the same. In this way, the retransmission has the same priority as the first transmission, and the accuracy of ROT control is increased. At the same time, the Node B can control the energy of several retransmissions and the superposition of the first transmission equal to the energy required for correct decoding, thereby reducing the uplink interference.

In order to achieve the above object, a method for controlling retransmission data ROT, in the rate scheduling mode, includes steps:

When the Node B receives the data from the UE, it decodes it. If the decoding is incorrect, the Node B sends a NACK to the UE, asking the UE to retransmit the data;

When retransmitting data,

Node B determines the change of the target ROT for retransmitting data;

The Node B uses the scheduling command RG to indicate the increase or decrease of the maximum rate allowed by the UE during retransmission;

The UE calculates the virtual transmission format combination according to the corresponding retransmission scheduling command RG sent by the Node B, thereby deriving the transmission power of the E-DPDCH channel during retransmission;

The UE uses the same transmission format combination as the first transmission, and sends the retransmission data with the derived transmission power of the E-DPDCH channel during retransmission.

According to another aspect of the present invention, a Node B transmitting device that controls the retransmission data ROT, in the rate scheduling mode, is characterized in that it includes a scheduling module, and the scheduling module includes an initial transmission scheduling module and a retransmission scheduling module, wherein , the scheduling command controlling the first transmission is output by the first transmission scheduling module, and the scheduling command controlling retransmission is output by the retransmission scheduling module.

Compared with the control method of ROT in EUDCH described in the existing TR25.896 v 1.1.2 version, the present invention can enable Node B to flexibly control the ROT of retransmitted data. Node B determines the expected ROT during retransmission according to the ROT of the current base station and the power required for correct decoding of E-DPDCH, and indicates it through the physical layer scheduling command. When the scheduling signaling is retransmitted, it no longer indicates the actual transmission rate, that is, the actually used TFC, but indicates the virtual transmission rate that the Node B expects the UE to achieve, that is, the virtual TFC. The UE calculates the power of the E-DPDCH during retransmission according to the scheduling command during retransmission.

Description of drawings

Fig. 1 is a flow chart of a method for controlling the amount of uplink thermal noise increase of retransmitted data in the rate scheduling mode of the prior art;

Fig. 2 is a flow chart of a method for controlling the increase in thermal noise of retransmitted data uplink in the rate and time scheduling mode of the prior art;

Fig. 3 is a hardware diagram of a terminal equipment transmitter with the function of controlling the increase of uplink thermal noise of retransmission data based on the base station in the rate scheduling mode;

Fig. 4 is a block diagram of an enhanced uplink dedicated channel gain factor generation module used to control the first transmission and retransmission in the rate scheduling scheme;

Fig. 5 is a flow chart of the base station action under the first option with the base station controlling the uplink thermal noise increase function of the retransmission data in the rate scheduling mode;

Fig. 6 is a flow chart of terminal actions under the first alternative scheme with the base station controlling the uplink thermal noise increase of retransmitted data in the rate scheduling mode;

Fig. 7 is the hardware device of the enhanced uplink dedicated channel gain factor generator in the first calculation method of the enhanced uplink dedicated channel transmission power during retransmission under the first option in rate scheduling;

Fig. 8 is a schematic diagram of base station pointers and terminal pointers in rate scheduling.

FIG. 9 is a hardware device diagram of the enhanced uplink dedicated channel gain factor generator in the second method for calculating the transmit power of the enhanced uplink dedicated channel during retransmission under the first option in rate scheduling;

Fig. 10 is a diagram of base station equipment with the function of controlling retransmission data uplink thermal noise increase based on the base station in rate scheduling;

Fig. 11 is a flow chart of terminal actions under the second optional scheme with the base station controlling the uplink thermal noise increase of retransmitted data in the rate scheduling mode;

Fig. 12 is a hardware device diagram of the uplink dedicated channel gain factor generator in the method for calculating the transmission power of the enhanced uplink dedicated channel during retransmission under the second option in rate scheduling;

Figure 13 is a flow chart of the interaction process between the base station and the terminal with the function of controlling the uplink thermal noise increase of retransmission data based on the base station in rate scheduling;

Fig. 14 is a flow chart of the interaction process between the base station and the terminal with the function of controlling the uplink thermal noise increase of the retransmission data based on the base station in the rate and time scheduling;

Fig. 15 is a hardware diagram of a terminal equipment transmitter with the function of controlling the uplink thermal noise increase of retransmission data based on the base station in the rate and time scheduling mode;

Fig. 16 is a block diagram of the enhanced uplink dedicated channel gain factor generation module used to control the first transmission and retransmission in the rate and time scheduling scheme;

Fig. 17 is a flow chart of the base station action based on the base station control retransmission data uplink thermal noise increase function in the rate and time scheduling mode;

Fig. 18 is a flow chart of the base station action based on the base station control retransmission data uplink thermal noise increase function in the rate and time scheduling mode;

19 is a hardware device diagram of the enhanced uplink dedicated channel gain factor generator in the first calculation method of the enhanced uplink dedicated channel transmission power during retransmission in rate and time scheduling;

Fig. 20 is a diagram of base station equipment with the function of controlling retransmission data uplink thermal noise increase based on the base station in rate and time scheduling;

FIG. 21 is a hardware device diagram of the enhanced uplink dedicated channel gain factor generator in the second calculation method of the enhanced uplink dedicated channel transmission power during retransmission in rate and time scheduling;

Fig. 22 is a flow chart of the base station action based on the base station control retransmission data uplink thermal noise increase function under the second option in the rate scheduling;

Detailed ways

The present invention proposes a device and method for Node B to flexibly control UE's retransmission data and first transmission data ROT in EUDCH. Compared with the existing rate scheduling mode and rate and time scheduling mode, the control of retransmission data ROT is added.

The present invention provides a device and method for flexibly controlling ROT during retransmission in a rate scheduling manner.

Figure 13 provides a flowchart of the method:

As shown in FIG. 13 , a flow chart of transmitting and receiving a HARQ process of a UE. The Node B determines the change of the target ROT for the first transmission of new E-DCH data according to the current ROT, and uses the scheduling command RateGrant (RG) 1301 to indicate to the UE. The UE adjusts the UE pointer according to the RG command, that is, the TFCS subset that the UE is allowed to use, and selects the actually used TFC in the TFCS subset that the UE is allowed to use according to the TFC selection algorithm, and then uses the selected TFC to send the first transmitted E- DCH new data 1302, so the rate of new data is less than or equal to the rate corresponding to the UE pointer. When the Node B receives new data 1302 of a HARQ process of the UE, it decodes it. If the decoding is correct, the Node B sends ACK to the UE, and the UE continues to send new data; if the decoding is incorrect, the Node B sends NACK1303 to the UE, asking the UE to retransmit the data; at the same time, according to the current ROT situation and E- The power required for correct DPDCH decoding determines the change of the retransmission data target ROT (that is, the expected received power of retransmission data), and is indicated by the scheduling command Rate Grant (RG) 1304 . When the RG command is used for retransmission and the first transmission, it indicates the increase or decrease of the maximum rate allowed by the UE. When the UE receives NACK, the UE retransmits the data 1305 . When retransmitting, because the HARQ module needs to be combined, the UE still uses the same transport format combination (TFC) as the first transmission to send data, that is, the rate remains unchanged, but the Node B wants to control the maximum allowable rate of the UE, by controlling The maximum power that the UE is allowed to use is displayed. The UE transmit power is calculated according to the corresponding scheduling command RG sent by the Node B, and is no longer the power corresponding to the actually used TBS.

From the point of view of the meaning of Node B sending the RG command, there are two options for this method:

First option:

Node B controls the rise and fall of ROT during retransmission according to the current ROT situation and the power required for correct decoding of E-DPDCH, which is the same as the ROT when controlling the first transmission, and sends a scheduling command RG to instruct UEpointer to rise and fall relative to the previous scheduling cycle. UE pointer to indicate the maximum rate allowed by the UE. The UE uses the same transmission format combination as the first transmission during retransmission, but the transmission power is controlled by the updated UE pointer, which is less than or equal to the power corresponding to the UE pointer. Therefore, in the first option, the UE pointer is updated relative to the previous scheduling period under the RG command during the first transmission and retransmission.

Second option:

Node B controls the rise and fall of ROT during retransmission according to the current ROT situation and the power required for correct decoding of E-DPDCH. It is different from controlling the ROT during the first transmission, and sends a scheduling command RG to instruct UE to allow the rate of retransmission relative to The RG command does not change the value of the UE pointer when the rate is increased or decreased during the first transmission, and the value of the UE pointer is only updated during the first transmission. The UE uses the same transmission format combination as the first transmission when retransmitting, but the transmission power is controlled by the updated rate allowed by the UE when retransmitting, not controlled by the UE pointer, and is less than or equal to the rate corresponding to the allowed rate of the UE power. For multiple retransmissions, RG indicates the increase or decrease of the rate that the UE is allowed to use in this retransmission relative to the rate in the previous transmission.

In options 1 and 2, RG is 1-bit three-value information, +1, -1, DTX. Compared with the UE equipment under the existing speed scheduling, the terminal (UE) equipment corresponding to this method improves the β _{d, eu} generation module. FIG. 3 shows a hardware diagram of a terminal equipment (UE) transmitter with the function of retransmitting data ROT based on Node B control in rate scheduling. The position of the β _{d, eu} generation module 324 in the UE transmitter is shown in Figure 3, and the output value of β _{d, eu} is the gain factor 307 after E-DPDCH spread spectrum, between β _{d, eu} and β _c The proportional relationship reflects the power ratio of E-DPDCH to DPCCH. The UE equipment is applicable to the case of E-DCH and DCH code division multiplexing. E-DCH and DCH are respectively mapped to different CcTrCHs, that is, one E-DCH is mapped to one CcTrCH, and there is only one TrCH in the TFC. At this time TFC can be replaced by TBS. The UE device has the function of controlling the retransmission data ROT, and the maximum allowable power used by the UE during retransmission is less than or equal to the power corresponding to the virtual TBS. The virtual TBS is the rate that the Node B expects the UE to achieve when retransmitting, inferred by the UE based on the RG command, rather than the actual TBS used during retransmission.

Figure 4 shows the block diagram of the improved β _{d, eu} generation module. As shown in Figure 4, the improved β _{d, eu} generation module 401 calculates the β _{d, eu} during the first transmission and the β _{d, eu} during the retransmission separately, and this module includes the gain factor β _{d, eu} calculation module 402 during the first transmission , the virtual TBS generation module 403 during retransmission, the gain factor β _{d during retransmission, the eu} calculation module 404, and the number selector MUX405. The operation is as follows: use the number of transmissions as the control terminal of the number selector MUX405, when the number of transmissions is the first transmission (i is equal to 1), that is, the first transmission, the output of the number selector selects β _{d when the first transmission, and the eu} calculation module 402 Calculated β _{d, eu} result; when the number of transmissions is the i-th transmission (i is greater than or equal to 2), that is, when retransmission, the output of the number selector selects β _{d when retransmission, eu} calculation module 404 calculates β _{d, eu} result. Wherein, in the gain factor β _{d, eu} calculation module 402 at the time of the first transmission, the β _{d at the time of the first transmission, eu} is calculated according to the transmission block size TBS#1 actually used at the time of the first transmission; and the gain factor β at the retransmission In _{the d, eu} calculation module 404, the β _{d, eu} during retransmission is not only calculated according to the actual transport block size TBS#1 during retransmission, but according to the result TBS#i of the virtual TBS generator 403 during retransmission (represents the TBS used in the i-th transmission, i>1) and the actual transport block size TBS#1 used in retransmission (also the TBS used in the first transmission) is derived. The function of the virtual TBS generator 403 during retransmission is to calculate the rate that the Node B expects the UE to achieve from the RG command, and convert the rate that the Node B expects the UE to achieve into power in module 404 . Corresponding to the first option and the second option, the virtual TBS generator 403 interprets the RG differently. Corresponding to option 1, the RG indicates the rise and fall of the UE pointer relative to the previous scheduling period, and the virtual TBS is updated The UE pointer corresponding to the maximum rate allowed by the UE; corresponding to option 2, the RG instructs the UE to increase or decrease the rate allowed to be used when retransmitting relative to the rate at the first transmission, the RG command does not change the value of the UE pointer, and the virtual TBS It refers to the maximum rate allowed by the UE during retransmission.

Compared with the Node B equipment under the existing rate scheduling, the base station (Node B) equipment corresponding to this method improves the scheduling module based on Node B. Figure 10 shows the hardware diagram of the base station (Node B) equipment transmitter with the function of retransmitting data ROT based on Node B control in rate scheduling. Functionally, Node B not only controls the ROT for the first transmission, but also controls the ROT for retransmission. As shown in Figure 10, the Node B-based scheduling module 1034 not only includes the Node B-based initial transmission scheduling module 1001, but also includes the Node B-based retransmission scheduling module 1002, and the Node B-based retransmission scheduling module 1002 is newly added in the present invention. These two functional modules can be separated or synthesized into one during hardware implementation, and the other modules are the same as those specified in the existing specification. The input terminal of the NodeB-based scheduling module 1034 receives ACK/NACK from Node B. If the UE receives the ACK, it outputs the RG value based on the Node B-based initial transmission scheduling module. If the UE receives NACK, it outputs the RG value based on the Node B The RG value generated by the retransmission scheduling module. RG1003 is output by the Node B-based first transmission scheduling module during the first transmission, and is output by the Node B-based retransmission scheduling module during retransmission. Corresponding to the first option and the second option, RG is used to indicate the maximum rate allowed by the UE to rise and fall, but the reference value of the rise and fall is different. Corresponding to option 1, RG indicates that the UE pointer is relative to the previous one. For the ups and downs of the scheduling period, the UE pointer indicates the maximum rate that the UE is allowed to use. Corresponding to option 2, the RG instructs the UE to allow the rate to be used during retransmission relative to the rate of the first transmission, and the RG command does not change the value of the UE pointer.

The present invention provides a device and method for flexibly controlling retransmission ROT in a rate and time scheduling mode.

Figure 14 provides a flowchart of the method:

FIG. 14 is a flow chart of sending and receiving a HARQ process of a UE. The Node B determines the target ROT for the first transmission of E-DCH new data according to the current ROT, and uses the scheduling command SchedulingAssignment (SA) 1401 to indicate to the UE. The UE obtains the TFCS subset that the UE is allowed to use according to the SA command, that is, the maximum rate that the UE is allowed to use, and selects the actually used TFC from the TFCS subset that the UE is allowed to use according to the TFC selection algorithm, and then uses the selected TFC to send to the Node B For the first transmitted E-DCH new data 1402, the rate of the new data is less than or equal to the maximum rate in the TFCS subset. When the Node B receives new data 1402 of a HARQ process of the UE, it decodes it. If the decoding is correct, the Node B sends ACK to the UE, and the UE continues to send new data; if the decoding is incorrect, the Node B sends NACK1403 to the UE, asking the UE to retransmit the data; at the same time, according to the current ROT situation and E- The power required for correct decoding of DPDCH determines the retransmission data target ROT (that is, the received power of the expected retransmission data), and is indicated by the scheduling command SchedulingAssignment (SA) or Rate Grant (RG) 1404, when the SA command is used for retransmission When it is transmitted for the first time, it indicates the maximum rate that the UE is allowed to use, which is an absolute value, and RG indicates the increase or decrease of the rate of this transmission compared to the previous transmission. When the UE receives a NACK, the UE retransmits the data 1405 . When retransmitting, because the HARQ module needs to be combined, the UE still uses the same transport block size (Transport Block Size) as the first transmission to send data, that is, the rate remains unchanged, but the Node B wants to control the maximum allowable rate of the UE. It is manifested by controlling the maximum power allowed by the UE. The transmit power of the UE is calculated according to the corresponding scheduling command SA/RG sent by the Node B, which is less than or equal to the power corresponding to the largest TFC in the TFCS subset that the UE is allowed to use, and is no longer the power corresponding to the actually used TFC.

Compared with the UE equipment under the existing speed scheduling, the terminal (UE) equipment corresponding to this method improves the β _{d, eu} generation module. FIG. 15 shows a hardware diagram of a terminal equipment (UE) transmitter with a Node B-based control retransmission data ROT function in the rate and time scheduling mode. The position of the β _{d, eu} generation module 1524 in the UE transmitter is shown in Figure 15, and the output value of ρ _{d, eu} is the gain factor 1507 after E-DPDCH spread spectrum, between β _{d, eu} and β _c The proportional relationship reflects the power ratio of E-DPDCH to DPCCH. The UE equipment is applicable to the case of E-DCH and DCH code division multiplexing. E-DCH and DCH are respectively mapped to different CcTrCHs, that is, one E-DCH is mapped to one CcTrCH, and there is only one TrCH in the TFC. At this time TFC can be replaced by TBS. The UE device has the function of controlling the retransmission data ROT, and the maximum allowable power used by the UE during retransmission is less than or equal to the power corresponding to the virtual TBS. The virtual TBS is the rate that the Node B expects the UE to achieve when retransmitting, inferred by the UE based on the SA/RG command, rather than the actual TBS used during retransmission.

Figure 16 shows the block diagram of the improved β _{d, eu} generation module. As shown in Figure 16, the improved β _{d, eu} generation module 1601 calculates the β _{d, eu} during the first transmission and the β _{d, eu} during the retransmission separately. This module includes the β _{d, eu} calculation module 1602 during the first transmission, and Virtual TBS generation module 1603 during transmission, β _{d, eu} calculation module 1604 during retransmission, and number selector MUX1605. The operation is as follows: use the number of transmissions as the control terminal of the number selector MUX1605, when the number of transmissions is the first transmission (i is equal to 1), that is, the first transmission, the output of the number selector selects β _{d when the first transmission, and the eu} calculation module 1602 Calculated β _{d, eu} result; when the number of transmissions is the i-th transmission (i is greater than or equal to 2), that is, when retransmission, the output of the number selector selects β _{d when retransmission, eu} calculation module 1604 calculates β _{d, eu} result. Wherein, in the gain factor β _{d, eu} calculation module 1602 at the time of the first transmission, the β _{d, eu} at the time of the first transmission is based on the actual transmission block size TBS#1 used at the time of the first transmission (representing the TBS used at the time of the first transmission) In the retransmission gain factor β _{d, eu} calculation module 1604, the retransmission β _{d, eu} calculation is not only calculated according to the actual transport block size TBS#1 used during retransmission, but according to Derivation from the result TBS#i of the virtual TBS generator 1603 during retransmission (representing the TBS used during the i-th transmission, i>1) and the actual transport block TBS#1 used during retransmission (also the TBS used during the first transmission) come out. The function of the virtual TBS generator 1603 during retransmission is to deduce the rate that the Node B expects the UE to achieve from the SA/RG command, and convert the rate that the Node B expects the UE to achieve into power in module 1604 .

The base station (Node B) equipment corresponding to this method is compared with the Node B equipment under the existing rate and time scheduling, and the scheduling module based on Node B is improved. Figure 20 shows the hardware diagram of the base station (Node B) equipment transmitter with the function of controlling retransmission data ROT based on Node B in rate scheduling. As shown in Figure 20, Node B not only controls the ROT for the first transmission, but also controls the ROT for retransmission. The Node B-based scheduling module 2034 not only includes the Node B-based initial transmission scheduling module 2001, but also includes the Node B-based retransmission scheduling module 2002. The Node B-based retransmission scheduling module 2002 is a newly added module in the present invention. The two functional modules can be separated or synthesized into one during hardware implementation, and the other modules are the same as those specified in the existing specification. The input end of the scheduling module 2034 based on Node B receives ACK/NACK from Node B, if the UE receives the ACK, then output the SA value based on the initial transmission scheduling module of Node B, if the UE receives NACK, then output the SA value based on the Node B The SA/RG value generated by B's retransmission scheduling module. SA2003 is output by the first transmission scheduling module during the first transmission, and is output by the retransmission scheduling module during retransmission.

The following introduces the definitions used in the present invention:

TFC#1: The transmission format combination actually used by the CcTrCH where the E-DCH is located during the first transmission and retransmission, corresponding to the transmission rate.

TFC#i (i>=2): The virtual transport format combination (TFC) derived from the RG command or SA command of the CcTrCH where the E-DCH is located during retransmission, which indicates the maximum allowable use by the Node B expected by the UE during retransmission. The rate does not represent the transmission format combination actually used by the UE. During retransmission, the UE will use the virtual TFC to calculate the transmission power of the E-DPDCH.

TBS#1: The actual transmission block size used by the E-DCH during the first transmission and retransmission, corresponding to the transmission rate.

TBS#i (i>=2): The E-DCH virtual transport block (TBS) derived from the RG command or SA command during retransmission, which indicates that the Node B expects the uplink E-DPDCH channel of the UE to be allowed to use during retransmission The maximum rate does not indicate the transport block size of the E-DCH channel actually used by the UE. During retransmission, the UE will use the virtual TBS to calculate the transmission power of the E-DPDCH.

Operation description of the device and method for flexibly controlling the ROT during retransmission in the rate scheduling mode.

How to control the ROT of retransmitted data, that is, how to use the scheduling command RG to indicate the expected target ROT of the Node B, and how the UE adjusts the transmission power according to the scheduling command RG is the core of the present invention. There are two specific options as follows:

Description of the actions of Node B and UE under the first option:

For a HARQ process, the actions of the Node B flexibly controlling the ROT method during retransmission under the first option are as follows:

Figure 5 shows the flow chart of Node B actions under the first option in the rate scheduling mode.

501Node B controls the rise and fall of ROT during the first transmission according to the current ROT situation, and sends the scheduling command Rate Grant (RG) command to instruct the UE pointer to rise and fall relative to the previous scheduling cycle. When the Node B expects that the rate of the UE in the first transmission is adjusted by a step in the positive direction compared with the previous scheduling period, the value of RG is set to UP; when the Node B expects the rate of the UE in the first transmission to be in the negative direction compared with the previous scheduling period Adjust a step size, and set the value of RG to DOWN (DN); when Node B expects that the rate of the UE in the first transmission remains unchanged from the previous scheduling period, the value of RG is set to DTX. TFC is sorted according to the corresponding power from small to large, and the direction from small to large is positive.

502 Node B receives and decodes the E-DCH data from the UE. 503 If the decoding result is correct, Node B sends ACK to UE, and then turns to 501 to schedule the next first transmission; 504, if the decoding result is wrong, Node B sends NACK to UE.

At the same time, the 505Node B should control the rise and fall of the ROT during retransmission according to the current ROT situation and the power required for E-DPDCH correct decoding. Decrease from the previous scheduling cycle. When the NodeB expects the rate of the UE to be adjusted in the positive direction compared with the previous scheduling period by one step, the value of RG is set to UP; when the NodeB expects the rate of the UE to be adjusted in the negative direction than the previous scheduling period A step size, the value of RG is set to DOWN (DN); when the Node B expects that the rate of the UE during retransmission remains unchanged from the previous scheduling period, the value of RG is set to DTX. The TFCs are sorted according to the corresponding power from small to large, that is, according to the rate from small to large, and the direction from small to large is positive. Then, Node B will turn to the action of 502 to decode.

In this alternative scheme, compared with the existing rate scheduling (RateScheduling) scheme, the action of Node B, in addition to deciding whether to determine the UE's ROT rise and fall at the time of the first transmission, sending the scheduling command RG corresponding to the first transmission, but also to decide During retransmission, the ROT of the UE is raised or lowered, and a scheduling command RG is sent to increase or decrease the rate relative to the previous scheduling period during retransmission. The retransmission of the RG command still uses the same channel as the first transmission.

Corresponding to the Node B device under the first option, the function of the Node B-based retransmission scheduling module is as follows: First, when the Node B retransmits, it is the same as controlling the first transmission, according to the current ROT situation and E-DPDCH correct The power required for decoding determines the expected ROT when the UE retransmits, and then the UE uses RG to indicate that the maximum rate allowed by the UE corresponds to the change of the previous scheduling period. Finally, Node B sends RG to UE.

For a HARQ process, the actions of the ROT method when the UE flexibly controls retransmission under the first option are as follows:

FIG. 6 shows the flow chart of UE actions under the first option in the rate scheduling mode.

601 The UE receives a command RG for controlling ROT up and down during the first transmission. 602 UE updates the UE pointer according to the value of RG: when the value of the received Rate Grant (RG) is UP, the UE pointer adjusts a step in the positive direction relative to the previous scheduling cycle; when the value of RG is DOWN (DN) , then the UE pointer adjusts a step in the negative direction relative to the previous scheduling period; when the value of RG is DTX, the UE pointer remains unchanged relative to the previous scheduling period. At this time, the transmission format combination relative to the UE pointer is TFC #1.

Then 603UE sends E-DCH new data, and its transmission format combination is TFC#1. The transmission power of E-DPDCH in the first transmission is based on the transmission block size TBS#1 actually used in the first transmission (indicating that it is used in the first transmission. TBS) calculated.

604 If the UE receives ACK, the UE continues to send E-DCH new data according to the above operations 601, 602, and 603; if the UE receives NACK, the UE prepares to retransmit the data, and 605 UE receives the control retransmission ROT from NodeB RG command, 606UE first updates the UEpointer according to the value of RG: when the value of the received Rate Grant (RG) is UP, the UE pointer adjusts a step in the positive direction relative to the previous scheduling cycle; when the value of RG is DOWN (DN), the UE pointer adjusts a step in the negative direction relative to the previous scheduling cycle; when the value of RG is DTX, the UE pointer remains unchanged relative to the previous scheduling cycle. 607 The UE derives the virtual TFC from the TFC corresponding to the UE pointer: in option 1, corresponding to the i-th (i>=2) transmission, the virtual TFC is the transmission format combination TFC#i( i>=2). The UE pointer is sorted according to the power corresponding to the TFC from small to large, and from small to large is the positive direction.

608 UE calculates the transmission power of E-DPDCH according to the virtual TFC, and the control of E-DPDCH transmission power is realized by adjusting the power ratio β _{d,eu of} E-DPDCH and DPCCH. 609 UE sends the retransmission data with the transmission format combination TFC#1 and the calculated E-DPDCH power during retransmission.

In 608, there are two methods for calculating the transmission power of the E-DPDCH according to the virtual TFC:

E-DPDCH transmit power calculation method 1 during retransmission:

This method is applicable to the case of E-DCH and DCH code division multiplexing. E-DCH and DCH are respectively mapped to different CcTrCHs, that is, one E-DCH is mapped to one CcTrCH, and there is only one TBS in the TFC. At this time TFC can be replaced by TBS.

The basic principle of method 1 is: the transmit power of the UE during retransmission is equal to the minimum value corresponding to the virtual TBS (TBS#i) and the TBS actually used during retransmission (TBS#1, which is also the TBS used for the first transmission) Power, if this power exceeds the maximum power the UE can use, the UE transmits at the maximum power it can use. In this method, the transmit power of the UE during retransmission is less than or equal to the power corresponding to the virtual TBS, and is also less than or equal to the power corresponding to the TBS used in the first transmission.

In the calculation of β _d,eu at the time of retransmission, β _d,eu =f(TBS=min(TBS#i, TBS#1)).

FIG. 7 shows the hardware device diagram of the β _{d, eu} generator in the first option for flexibly controlling retransmission ROT in rate scheduling, and the E-DPDCH transmission power calculation method during retransmission.

As shown in FIG. 7 , 701 is the same as 401, 702 is the same as 402, 703 is the same as 403, 704 is the same as 404, and 708 is the same as 405. In this figure, 703 and 704 are expanded.

The virtual TBS generation module 703 includes a module, that is, a virtual TBS generator 705, and the input terminals of the virtual TBS generator 705 are the value of RG and the current UE pointer. When the value of RG is UP, the UE pointer is updated to adjust a step in the positive direction relative to the previous scheduling cycle; when the value of RG is DOWN (DN), the UE pointer is updated to be negative relative to the previous scheduling cycle Adjust a step size; when the value of RG is DTX, the UE pointer is updated to remain unchanged relative to the previous scheduling period. The output of the virtual TBS generator is the transmission format combination TFC#i (i is the number of transmissions, i>=2) corresponding to the updated UE pointer. The UE pointer is sorted according to the power corresponding to the TFC from small to large, and from small to large is the positive direction.

During retransmission, the β _d,eu calculation module 704 includes a smaller comparator 706 and a β _d,eu calculator 707 . The small comparator compares the input TBS#1 with the TBS#i output by the virtual TBS generation module 703, and outputs the smallest one. Send this smallest transmission block into the β _{d, eu} calculator 707 to calculate β _{d, eu} , and the function of the β _{d, eu} calculator is the same as that of the first transmission during retransmission.

E-DPDCH transmission power calculation method two during retransmission:

This method is applicable to the case of E-DCH and DCH code division multiplexing. E-DCH and DCH are respectively mapped to different CcTrCHs, that is, one E-DCH is mapped to one CcTrCH, and there is only one TBS in the TFC. At this time TFC can be replaced by TBS.

The basic principle of Method 2 is: the transmit power of the UE during retransmission is equal to the power corresponding to the virtual TBS (TBS#i). If the power exceeds the maximum power available to the UE, the UE transmits at the maximum power available to it. Compared with method 1 in option 1, in method 2, the transmit power of the UE during retransmission may exceed the power corresponding to the TBS actually used during retransmission (also the TBS used during the first transmission).

In the calculation of β _d,eu at the time of retransmission, β _d,eu =f(TBS=TBS#i).

FIG. 9 shows the hardware device diagram of the β _{d, eu} generator in the second method for calculating the transmission power of the E-DPDCH during retransmission in the first option of flexibly controlling the retransmission ROT in rate scheduling.

As shown in Figure 9, 901 is the same as 401, 902 is the same as 402, 903 is the same as 403, 904 is the same as 404, and 907 is the same as 405. In this figure, 903 and 904 are expanded.

The virtual TBS generation module 903 includes a module, that is, a virtual TBS generator 905. The input terminals of the virtual TBS generator 905 are the value of RG and the current UE pointer. When the value of RG is UP, the UE pointer is updated to adjust a step in the positive direction relative to the previous scheduling cycle; when the value of RG is DOWN (DN), the UE pointer is updated to be adjusted in the negative direction relative to the previous scheduling cycle A step size; when the value of RG is DTX, the UE pointer is updated to remain unchanged relative to the previous scheduling period. The output of the virtual TBS generator is the transmission format combination TFC#i (i is the number of transmissions, i>=2) corresponding to the updated UE pointer. The UE pointer is sorted according to the power corresponding to the TFC from small to large, and from small to large is the positive direction.

During retransmission, the β _d,eu calculation module 904 includes a module, that is, a β _d,eu calculator 906 . The output TBS#i of the virtual TBS generator 905 is sent to the β _{d, eu} calculator 907 to calculate β _{d, eu} , and the function of the β _{d, eu} calculator in retransmission is the same as that in the first transmission.

Action description of Node B and UE under the second option:

For a HARQ process, the Node B flexibly controls the ROT method during retransmission under the second option, and the action is as follows:

Figure 22 shows the flow chart of Node B actions under the second option in the rate scheduling mode.

2201Node B controls the rise and fall of ROT during the first transmission according to the current ROT situation. When the Node B expects that the rate of the UE in the first transmission is adjusted by a step in the positive direction compared with the previous scheduling period, the value of RG is set to UP; when the Node B expects the rate of the UE in the first transmission to be in the negative direction compared with the previous scheduling period Adjust a step size, and set the value of RG to DOWN (DN); when Node B expects that the rate of the UE in the first transmission remains unchanged from the previous scheduling period, the value of RG is set to DTX.

2202 Node B receives and decodes the E-DCH data from the UE. 2203 If the decoding result is correct, the Node B sends an ACK to the UE, and then turns to 2201, and continues to send a scheduling command for new data; 2204, if the decoding result is wrong, the Node B sends a NACK to the UE.

2205Node B also needs to control the rise and fall of ROT during retransmission according to the current ROT situation. It is different from controlling the ROT during the first transmission. It sends a scheduling command RG to instruct the UE to allow the rate to be used during retransmission relative to the rate of the first transmission. The RG command Does not change the value of the UE pointer. When the Node B expects that the rate of the UE during retransmission is adjusted by a step in the positive direction compared with the first transmission, the value of RG is set to UP; when the Node B expects that the rate of the UE in retransmission is adjusted by a step in the negative direction compared with the first transmission , the value of RG is set to DOWN (DN); when the Node B expects that the UE's retransmission rate remains unchanged from the first transmission, the value of RG is set to DTX. TFC is sorted according to the corresponding power from small to large, and the direction from small to large is positive.

After executing 2205, the Node B turns to 2202 to decode the retransmitted data.

In this alternative scheme, compared with the existing rate scheduling (Rate Scheduling) scheme, the action of Node B, in addition to determining the UE's ROT rise and fall relative to the previous scheduling period when the first transmission is made, sends the corresponding ROT for the first transmission The scheduling command RG also determines the current ROT situation and the power required for E-DPDCH to correctly decode the ROT of the UE during retransmission relative to the first transmission, and sends the scheduling command RG relative to the first transmission rate during retransmission . Compared with option 1, in option 2, RG represents the increase or decrease of retransmission relative to the first transmission rate, rather than the increase or decrease of retransmission relative to the maximum rate of the previous scheduling period; and, retransmission The RG at this time does not change the value of the UE pointer.

Corresponding to the Node B equipment under the second option, the function of the Node B-based retransmission scheduling module is as follows: First, the Node B decides according to the current ROT situation and the power required for correct decoding of the E-DPDCH during retransmission The expected ROT when the UE retransmits, and then Node B uses RG to indicate that the maximum rate allowed by the UE corresponds to the change during the first transmission. Finally, the Node B sends the RG to the UE to control the retransmission.

For a HARQ process, the UE flexibly controls the ROT method for retransmission under the second option as follows:

FIG. 11 shows a flow chart of UE actions under the second option in the rate scheduling manner. 1101 The UE receives a command RG for controlling ROT up and down during the first transmission. 1102 UE updates the UE pointer according to the value of RG: when the value of the received Rate Grant (RG) is UP, the UE pointer adjusts a step in the positive direction relative to the previous scheduling cycle; when the value of RG is DOWN (DN) , then the UE pointer adjusts a step in the negative direction relative to the previous scheduling period; when the value of RG is DTX, the UE pointer remains unchanged relative to the previous scheduling period. At this time, the transport format combination relative to the UE pointer is TFC#1. The UE pointer is sorted according to the power corresponding to the TFC from small to large, and from small to large is the positive direction.

Then 1103UE sends E-DCH new data, and its transmission format combination is TFC#1, and the transmission power of E-DPDCH in the first transmission is based on the transmission block size TBS#1 actually used in the first transmission (indicating that it is used in the first transmission) TBS) calculated.

1104 If the UE receives ACK, the UE continues to send E-DCH new data according to the above operations 1101, 1102, 1103; if the UE receives NACK, the UE prepares to retransmit the data, 1105 UE receives the control retransmission ROT from NodeB 1106 UE maintains the UE pointer unchanged, 1107 UE derives the virtual transmission format combination TFC#i from the value of RG and the transmission format combination TFC#1 actually used by the UE during the first transmission (i corresponds to the number of transmissions, i>=2) : When the value of the received Rate Grant (RG) is UP, then the virtual transmission format combination TFC#i is the transmission format combination adjusted by one step in the positive direction relative to the transmission format combination TFC#1 used in the first transmission; When the value of RG is DOWN (DN), the virtual transport format combination TFC#i is the transport format combination adjusted by one step in the negative direction relative to the transport format combination TFC#1 used in the first transmission; when the value of RG is DTX, the virtual transport format combination TFC#i is the same as the transport format combination TFC#1 used in the first transmission. TFC is sorted according to the corresponding power from small to large, and the direction from small to large is positive.

1108 The UE calculates the rate according to the virtual TFC, and the control of the E-DPDCH transmission power is realized by adjusting the power ratio β _d,eu of the E-DPDCH and the DPCCH. 1109 UE sends the retransmission data with the transmission format combination TFC#1 and the calculated E-DPDCH power during retransmission.

The method of calculating the transmission power of the E-DPDCH according to the virtual TFC in 1108 is as follows: This method is applicable to the case of code division multiplexing of E-DCH and DCH. E-DCH and DCH are respectively mapped to different CcTrCHs, that is, one E-DCH is mapped to one CcTrCH, and there is only one TBS in the TFC. At this time TFC can be replaced by TBS.

The basic principle of this method is: the transmit power of the UE during retransmission is equal to the power corresponding to the virtual TBS (TBS#i), if the power exceeds the maximum power available to the UE, the UE transmits with the maximum power available to it.

In the calculation of β _d,eu at the time of retransmission, β _d,eu =f(TBS=TBS#i).

FIG. 12 shows the hardware device diagram of the β _{d, eu} generator in the method for calculating the transmission power of the E-DPDCH during retransmission in the second alternative scheme of flexibly controlling the retransmission ROT in rate scheduling.

As shown in Figure 12, 1201 is the same as 401, 1202 is the same as 402, 1203 is the same as 403, 1204 is the same as 404, and 1207 is the same as 405. This figure expands 1203 and 1204.

The virtual TBS generation module 1203 includes a module, that is, a virtual TBS generator 1205. The input terminal of the virtual TBS generator 1205 is the value of RG and the transmission format TBS#1 used for the first transmission. When the value of RG is UP, the virtual transmission format combination TBS#i is the transmission format adjusted by one step in the positive direction relative to the transmission format TBS#1 used in the first transmission; when the value of RG is DOWN(DN), Then the virtual transmission format TBS#i is the transmission format combination after adjusting a step in the negative direction relative to the transmission format TBS#1 used in the first transmission; when the value of RG is DTX, the virtual transmission format TBS#i is the same as the first transmission The same transmission format as TBS#1 is used. The transmission formats are sorted according to their corresponding power from small to large, and from small to large is the positive direction.

During retransmission, the β _d,eu calculation module 1204 includes a module, that is, a β _d,eu calculator 1206 . The output TBS#i of the virtual TBS generator 1205 is sent to the β _d,eu calculator 1207 to calculate β _d,eu , and the function of the β _d,eu calculator in retransmission is the same as that in the first transmission.

Operation description of the device and method for flexibly controlling ROT during retransmission in the rate and time scheduling mode:

How to control the ROT of retransmitted data, that is, how to use the scheduling command SA/RG to indicate the expected target ROT of the Node B, and how the UE adjusts the transmission power according to the scheduling command SA/RG is the core of the present invention.

The Node B controls the ROT for retransmission according to the current ROT situation, which is the same as the ROT for the first transmission. It sends a scheduling command SA to indicate the TFCS subset that the UE is allowed to use, that is, the maximum rate that the UE is allowed to use, or sends an RG to indicate this time. The relative value of the TFCS subset that the UE is allowed to use is adjusted relative to the previous transmission, that is, the maximum rate that the UE is allowed to use. When the RG is UP, the maximum rate that the UE is allowed to use is adjusted in a positive direction relative to the previous transmission. Step size, when the RG is DOWN, the maximum rate allowed by the UE is adjusted to a negative direction relative to the previous transmission. When the RG is DTX, the maximum rate allowed by the UE remains unchanged compared to the previous transmission, and TFC follows The order of power demand from small to large is the positive direction. The UE uses the same transmission format combination as the first transmission during retransmission, but the transmission power is controlled by the updated maximum rate allowed by the UE, which is less than or equal to the power corresponding to the maximum rate allowed by the UE.

For a HARQ process, the actions of the ROT method when the Node B flexibly controls retransmission in the rate and time scheduling mode are as follows:

Figure 17 shows the flow chart of Node B actions in the rate and time scheduling mode.

1701 Node B controls the ROT at the first transmission according to the current ROT situation, and sends a scheduling command Scheduling Assignment (SA) command to explicitly indicate the TFCS subset that the UE is allowed to use, that is, the maximum rate that the UE is allowed to use. 1702 Node B receives and decodes the E-DPDCH data from the UE. 1703 If the decoding result is correct, the Node B sends an ACK to the UE, and then turns to 1701 to continue sending a scheduling command for new data; 1704, if the decoding result is wrong, the Node B sends a NACK to the UE.

1705Node B should also control the ROT during retransmission according to the current ROT situation and the power required for correct decoding of E-DPDCH, which is the same as the ROT during the first transmission, and send a scheduling command Scheduling Assignment (SA) command to explicitly instruct the UE The TFCS subset allowed to be used is the maximum rate allowed by the UE, or the RG is sent to indicate the relative value adjusted by the TFCS subset allowed to be used by the UE in this transmission relative to the previous transmission, that is, the maximum rate allowed by the UE. Then turn to 1702 to decode.

Compared with the existing rate and time scheduling (Rate and time Scheduling) scheme, the action of Node B not only determines the UE's ROT at the time of the first transmission, sends the scheduling command SA corresponding to the first transmission, but also determines the UE's ROT at the time of retransmission , and send the scheduling command SA/RG corresponding to the retransmission.

For a HARQ process, the actions of the ROT method when the UE flexibly controls retransmission in the rate and time scheduling mode are as follows:

Figure 18 shows the flow chart of the actions of the UE in the rate and time scheduling mode.

1801 UE sends Scheduling Information (SI) for Node B to perform scheduling, including buffer status and power status. 1802 The UE receives the command SA to control the ROT during the first transmission, and the SA explicitly indicates the maximum transmission rate allowed by the UE. Then 1803UE sends E-DCH new data, and its transmission format combination is TFC#1. The transmission power of E-DPDCH in the first transmission is calculated according to the transmission format combination TFC#1 actually used in the first transmission, that is, β _{d, eu} =f(TBS=TBS#1). 1804 If the UE receives ACK, the UE continues to send E-DCH new data according to the above operations 1801, 1802, 1803; if the UE receives NACK, the UE prepares to retransmit the data, 1805 UE receives the control retransmission ROT from NodeB SA/RG command, 1806 UE updates the TFCS subset allowed by the UE according to the value of SA/RG, that is, the maximum rate allowed by the UE, and the virtual TFC is the maximum rate allowed by the UE after the update, denoted as TFC#i(i ＞=2, i represents the number of transmissions).

The UE calculates the transmission power of the E-DPDCH according to the virtual TFC, and the control of the transmission power of the E-DPDCH is realized by adjusting the power ratio β _d,eu of the E-DPDCH and the DPCCH. 1808 The UE combines TFC#1 with the transport format, and sends the retransmission data with the calculated E-DPDCH power during retransmission.

In 1807, there are two methods for calculating the transmission power of E-DPDCH according to the virtual TFC:

E-DPDCH transmit power calculation method 1 during retransmission:

This method is applicable to the case of code division multiplexing of E-DCH and DCH. E-DCH and DCH are respectively mapped to different CcTrCHs, that is, one E-DCH is mapped to one CcTrCH, and there is only one TBS in the TFC. At this time TFC can be replaced by TBS.

The basic principle of method 1 is: the transmit power of the UE during retransmission is equal to the minimum value corresponding to the virtual TBS (TBS#i) and the TBS actually used during retransmission (TBS#1, which is also the TBS used for the first transmission) Power, if this power exceeds the maximum power the UE can use, the UE transmits at the maximum power it can use. In this method, the transmit power of the UE during retransmission is less than or equal to the power corresponding to the virtual TBS, and is also less than or equal to the power corresponding to the TBS used in the first transmission.

In the calculation of β _d,eu at the time of retransmission, β _d,eu =f(TBS=min(TBS#i, TBS#1)).

FIG. 19 shows a hardware device diagram of the β _d,eu generator in the first calculation method of E-DPDCH transmission power during retransmission in the corresponding rate and time scheduling scheme.

As shown in Figure 19, 1901 is the same as 401, 1902 is the same as 402, 1903 is the same as 403, 1904 is the same as 404, and 1908 is the same as 405. This figure expands 1903 and 1904.

The virtual TBS generation module 1903 includes a module, that is, a virtual TBS generator 1905, and the input terminal of the virtual TBS generator 1905 is an SA/RG command. The UE updates the TFCS subset that the UE is allowed to use according to the SA/RG value, that is, the maximum rate that the UE is allowed to use. The output of the virtual TBS generator is the updated maximum rate allowed by the UE, which is denoted as TBS#i.

During retransmission, the β _{d, eu} calculation module 1904 includes a smaller comparator 1906 and a β _{d, eu} calculator 1907 . The small comparator compares the input TBS#1 with the TBS#i output by the virtual TBS generation module 1903, and outputs the smallest one. Send this smallest transmission block into the β _{d, eu} calculator 1907 to calculate β _{d, eu} , and the function of the β _{d, eu} calculator is the same as that of the first transmission during retransmission.

E-DPDCH/DPCCH power ratio Aj calculation method two during retransmission:

This method is applicable to the case of E-DCH and DCH code division multiplexing. E-DCH and DCH are respectively mapped to different CcTrCHs, that is, one E-DCH is mapped to one CcTrCH, and there is only one TBS in the TFC. At this time TFC can be replaced by TBS.

The basic principle of Method 2 is: the transmit power of the UE during retransmission is equal to the power corresponding to the virtual TBS (TBS#i). If the power exceeds the maximum power available to the UE, the UE transmits at the maximum power available to it. Compared with method one, in method two, the transmit power of the UE during retransmission may exceed the power corresponding to the TBS used in the first transmission.

In the calculation of β _d,eu at the time of retransmission, β _d,eu =f(TBS=TBS#i).

FIG. 21 shows a hardware device diagram of the β _d,eu generator in the second calculation method of E-DPDCH transmission power in the corresponding rate and time scheduling scheme.

As shown in Figure 21, 2101 is the same as 401, 2102 is the same as 402, 2103 is the same as 403, 2104 is the same as 404, and 2107 is the same as 405. This figure expands 2103 and 2104.

The virtual TBS generation module 2103 includes a module, that is, a virtual TBS generator 2105, and the input terminal of the virtual TBS generator 2105 is the value of SA/RG. The UE updates the TFCS subset that the UE is allowed to use according to the SA/RG value, that is, the maximum rate that the UE is allowed to use. The output of the virtual TBS generator 2105 is the updated maximum rate allowed by the UE, denoted as TBS#i.

During retransmission, the β _d,eu calculation module 2104 includes a module, that is, a β _d,eu calculator 2106 . The output TBS#i of the virtual TBS generator 2105 is sent to the β _d,eu calculator 2107 to calculate β _d,eu , and the function of the β _d,eu calculator in retransmission is the same as that in the first transmission.

Claims (45)

1. A method for controlling retransmission data ROT, in the rate scheduling mode, comprising steps: When the Node B receives the data from the UE, it decodes it. If the decoding is incorrect, the Node B sends a NACK to the UE, asking the UE to retransmit the data; When retransmitting data, Node B determines the change of the target ROT for retransmitting data; The Node B uses the scheduling command RG to indicate the increase or decrease of the maximum rate allowed by the UE during retransmission; The UE calculates the virtual transmission format combination according to the corresponding retransmission scheduling command RG sent by the Node B, thereby deriving the transmission power of the E-DPDCH channel during retransmission; The UE uses the same transmission format combination as the first transmission, and sends the retransmission data with the derived transmission power of the E-DPDCH channel during retransmission. 2. The method according to claim 1, characterized in that the change of the target ROT of the retransmission data is determined by the Node B according to the situation of the current ROT and the correct decoding power of the E-DPDCH. 3. The method according to claim 1, wherein the RG command is used to indicate the increase and decrease of the maximum rate allowed by the UE during retransmission, and is used for the UE to calculate the virtual transmission format combination, and then derive the E-DPDCH channel Send power during retransmission. 4. The method of claim 3, comprising the steps of: Node B sends a scheduling command RG during retransmission to instruct the UE pointer to increase or decrease relative to the previous scheduling cycle; The UE uses the same transmission block as the first transmission during retransmission, but the transmission power is controlled by the updated UE pointer, which is less than or equal to the power corresponding to the UE pointer. 5. by the described method of claim 4, it is characterized in that the generation of described RG order sent from Node B is: When the Node B expects that the rate of the UE during retransmission moves one step in the positive direction compared with the previous scheduling period, the value of RG is set to UP; When the Node B expects that the rate of the UE during retransmission moves one step in the negative direction compared with the previous scheduling period, the value of RG is set to DOWN; When the Node B expects that the rate of the UE during retransmission remains unchanged from the previous scheduling period, the value of RG is set to DTX; TFC is sorted according to the corresponding power from small to large, and the direction from small to large is positive. 6. The method according to claim 4, wherein the UE uses the same transport block TBS#1 as the first transmission when retransmitting, but the transmission power is controlled by the updated UE pointer, which is less than the UE pointer Corresponding power, including steps: The UE receives an RG command for controlling retransmission; The UE updates the UE pointer according to the RG command to obtain the virtual TFC; The UE uses the virtual TFC to calculate the transmission power of the E-DPDCH during retransmission; The UE sends the retransmission data with the transmission format combination TFC#1 and the calculated E-DPDCH power during retransmission. 7. The method according to claim 6, wherein the updating of the UE pointer comprises: When the received RG value corresponding to the retransmission is UP, the UE pointer adjusts a step in the positive direction relative to the previous scheduling period; When the value of RG is DOWN, the UE pointer adjusts a step in the negative direction relative to the previous scheduling period; When the value of RG is DTX, the UE pointer remains unchanged relative to the previous scheduling period; The UE pointer is sorted according to the power corresponding to the TFC from small to large, and from small to large is the positive direction. 8. The method according to claim 6, wherein the derivation of the virtual TFC is obtained by the corresponding TFC of the UE pointer, corresponding to the i (i>=2) transmission, and the virtual TFC is corresponding to the updated UE pointer The transport format combination TFC#i (i>=2). 9. The method according to claim 6, wherein the UE uses the virtual TFC to calculate the E-DPDCH transmission power during retransmission, including: the E-DPDCH transmission power is equal to the virtual TFC (TFC#i) during retransmission The power corresponding to the minimum value of TFC (TFC#1) actually used during retransmission, if the power exceeds the maximum power available to the UE, the UE transmits at the maximum power available to it. 10. The method according to claim 9, characterized in that the control of the E-DPDCH transmission power is realized by adjusting the power ratio βd _,eu of E-DPDCH and DPCCH by UE according to the virtual TFC, for E-DCH and DCH code division multiplexing, including: in the calculation of β _{d, eu} during retransmission, β _{d, eu} is the minimum value based on the virtual TBS and the TBS actually used during retransmission, that is, min{TBS#1, TBS#i }, calculated. 11. The method according to claim 6, wherein the UE uses the virtual TFC to calculate the E-DPDCH transmission power when retransmission comprises: the UE transmission power during retransmission is equal to the value specified by the virtual TFC (TFC#i) Corresponding power, if the power exceeds the maximum power available to the UE, the UE transmits at the maximum power available to it. 12. The method according to claim 11, characterized in that the control of the E-DPDCH transmission power is realized by adjusting the power ratio βd _{, eu} of E-DPDCH and DPCCH by the UE according to the virtual TFC, for E-DCH and DCH code division multiplexing, in the calculation of β _{d, eu} during retransmission, β _{d, eu} is calculated according to the virtual TBS (TBS#i). 13. The method of claim 3, comprising the steps of: The Node B sends a scheduling command RG to instruct the UE to increase or decrease the rate allowed for retransmission relative to the rate at the first transmission, without changing the value of the UE pointer; The UE uses the same transmission block TBS#1 as the first transmission when retransmitting, but the transmission power is controlled by the updated rate allowed by the UE when retransmitting, and is less than or equal to the power corresponding to the rate allowed by the UE. 14. The method of claim 13, characterized in that: When the Node B expects that the rate of the UE during retransmission is adjusted by a step in the positive direction compared with the first transmission, the value of RG is set to UP; When the Node B expects that the rate of the UE during retransmission is adjusted to a negative direction compared with the first transmission, the value of RG is set to DOWN; When the Node B expects that the rate of the UE during retransmission remains unchanged from the first transmission, the value of RG is set to DTX; TFC is sorted according to the corresponding power from small to large, and the direction from small to large is positive. 15. The method according to claim 13, characterized in that the UE uses the same transport block TBS#1 as the first transmission when retransmitting, but the transmission power is controlled by the updated allowed rate of UE retransmission , less than or equal to the power corresponding to the rate allowed by the UE includes the steps: The UE derives the virtual TFC according to the RG command, and the UE pointer remains unchanged; Using the virtual TFC to calculate the transmission power of the E-DPDCH during retransmission; The UE sends the retransmission data with the transmission format combination TFC#1 and the calculated E-DPDCH power during retransmission. 16. The method according to claim 15, wherein the UE derives a virtual transport format combination TFC#i (i corresponds to the number of transmissions, i>=2): When the value of the received RG is UP, the virtual transport format combination TFC#i is the transport format combination adjusted by one step in the positive direction relative to the transport format combination TFC#1 used in the first transmission; When the value of RG is DOWN, the virtual transport format combination TFC#i is the transport format combination adjusted by one step in the negative direction relative to the transport format combination TFC#1 used in the first transmission; When the value of RG is DTX, the virtual transport format combination TFC#i is the same as the transport format combination TFC#1 used in the first transmission; TFCs are sorted according to their corresponding power from small to large, and the direction from small to large is positive. 17. The method according to claim 15, wherein the UE calculates the transmission power of the E-DPDCH during retransmission by using the virtual TFC, including: the transmission power of the UE during retransmission is equal to the virtual TFC (TFC#i ), if the power exceeds the maximum power available to the UE, the UE transmits at the maximum power available to it. 18. The method according to claim 17, characterized in that the control of the E-DPDCH transmission power is realized by adjusting the power ratio βd _,eu of E-DPDCH and DPCCH by the UE according to the virtual TFC, for E-DCH and DCH code division multiplexing, in the calculation of β _{d, eu} during retransmission, β _{d, eu} is calculated according to the virtual TBS (TBS#i). 19. A Node B transmitting device that controls retransmission data ROT, in the rate scheduling mode, it is characterized in that it includes a scheduling module, and the scheduling module includes an initial transmission scheduling module and a retransmission scheduling module, wherein the scheduling of the first transmission is controlled The command is output by the first transmission scheduling module, and the scheduling command for controlling retransmission is output by the retransmission scheduling module. 20. A terminal device for controlling the retransmission data ROT, in the rate scheduling mode, comprising a β _d,eu generating module for generating a gain factor β _d,eu of the E-DPDCH channel. 21. The terminal device according to claim 20, characterized in that said β _{d, eu} generating module comprises: The first transmission β _{d, eu} calculation module calculates the first transmission β _{d, eu} according to the TBS (TBS#1) used for the first transmission; The virtual TBS generation module during retransmission is used to calculate the maximum rate that the Node B expects the UE to achieve from the RG command; During retransmission, the β _{d, eu} calculation module calculates β d, _eu according to the result TBS#i of the virtual TBS generator during retransmission and the actual transmission block TBS#1 used during retransmission; The number selector MUX is used to select and output the β _{d, eu} calculation module for the first transmission and the β d, _eu result calculated by the β _{d, eu} calculation module during retransmission, and use the number of transmission times as the control terminal of the number selector MUX. 22. The terminal device according to claim 21, wherein the virtual TBS generating module during the retransmission comprises: Virtual TBS generator for When the value of RG input by the virtual TBS generator is UP, the UE pointer is updated to adjust a step in the positive direction relative to the previous scheduling period; When the value of RG is DOWN, the UE pointer is updated to adjust a step in the negative direction relative to the previous scheduling cycle; When the value of RG is DTX, the UE pointer is updated to remain unchanged relative to the previous scheduling cycle; The output of the virtual TBS generator is the transmission format combination TFC#i corresponding to the updated UE pointer (i is the number of transmissions, i>=2); The UE pointer is sorted according to the power corresponding to the TFC from small to large, and from small to large is the positive direction. 23. The terminal device according to claim 21, wherein the virtual TBS generating module during the retransmission comprises: Virtual TBS generator for: When the value of RG input by the virtual TBS generator is UP, the virtual transmission format combination TBS#i is a transmission format adjusted by one step in the positive direction relative to the transmission format TBS#1 used in the first transmission; When the value of RG is DOWN, the virtual transmission format TBS#i is a transmission format combination adjusted by one step in the negative direction relative to the transmission format TBS#1 used in the first transmission; When the value of RG is DTX, the virtual transmission format TBS#i is the same as the transmission format TBS#1 used in the first transmission; The transmission formats are sorted according to their corresponding power from small to large, and from small to large is the positive direction. 24. The terminal device according to claim 21, wherein the retransmission time βd _{, eu} calculation module comprises: A small comparator is used to compare the TBS (TBS#1) actually used during the input retransmission with the TBS#i output by the virtual TBS generation module, and output the smallest one; β _{d, eu} calculator, calculate β _{d, eu} according to the output of the smaller comparator. 25. The terminal device according to claim 21, wherein the retransmission time βd _{, eu} calculation module comprises: β _d,eu calculator to calculate β _d,eu from the output of the virtual TBS generator. 26. A method for controlling retransmission data ROT, in the rate and time scheduling mode, comprising steps: When the Node B receives the data from the UE, it decodes it. If the decoding is incorrect, the Node B sends a NACK to the UE, asking the UE to retransmit the data; When retransmitting data, Node B decides the target ROT of the retransmission data (that is, the expected receiving power of the retransmission data); Node B uses the scheduling command Scheduling Assignment (SA) to indicate the maximum rate allowed by the UE during retransmission, or uses Rate Grant (RG) to indicate the increase or decrease of the maximum rate allowed by the UE for this retransmission relative to the previous transmission; The UE derives the virtual transmission format combination according to the corresponding retransmission scheduling command SA/RG sent by the Node B, thereby deriving the transmission power of the E-DPDCH channel during retransmission; The UE uses the same transmission format combination as the first transmission, and sends the retransmission data with the derived transmission power of the E-DPDCH channel during retransmission. 27. The method according to claim 26, characterized in that the target ROT of the retransmitted data is determined by the Node B according to the current ROT situation and the power required for correct decoding of the E-DPDCH. 28. The method according to claim 26, characterized in that the scheduling command SchedulingAssignment (SA) is used to indicate the TFCS subset allowed to be used when the UE retransmits decided by the NodeB, and is used for the UE to calculate the virtual transmission format Combined, and then derive the transmission power of the E-DPDCH channel during retransmission. 29. The method according to claim 26, characterized in that the scheduling command Rate Grant (RG) indicates the maximum rate allowed by the UE for this retransmission relative to the previous transmission, thereby implicitly instructing the NodeB to determine The subset of TFCS that the UE is allowed to use when retransmitting: When the RG is UP, the maximum rate allowed by the UE is adjusted by a step in the positive direction relative to the previous transmission; When the RG is DOWN, the maximum rate allowed by the UE is adjusted by a step in the negative direction relative to the previous transmission; When the RG is DTX, the maximum rate allowed by the UE remains unchanged from the previous transmission. 30. The method according to claim 26, wherein the UE derives a virtual transmission format combination according to the corresponding retransmission scheduling command SA/RG sent by the Node B, thereby deriving that the E-DCH data channel is retransmitted The transmission power of transmission time, including steps: The UE receives the SA/RG command from the NodeB to control the retransmission of the ROT; The UE updates the maximum rate allowed for UE retransmission according to the value of SA/RG, and obtains the virtual TFC; The transmission power of the E-DPDCH at the time of retransmission is calculated by using the virtual TFC. 31. The method according to claim 30, wherein when the scheduling command is SA, the updated maximum rate allowed for UE retransmission is the maximum TFC in the TFCS subset corresponding to SA. 32. The method according to claim 30, wherein when the scheduling command is RG, the maximum rate allowed for retransmission of the updated UE is: When the RG is UP, the maximum rate allowed by the UE to be used in the previous transmission is adjusted by a step in the positive direction; When RG is DOWN, the maximum rate allowed by the UE to be used in the previous transmission is adjusted by a step in the negative direction; When the RG is DTX, the maximum rate allowed by the UE remains unchanged compared to the previous transmission. 33. The method according to claim 30, characterized in that RG is represented by 1-bit three-value information: +1, -1, DTX. 34. The method according to claim 30, characterized in that the virtual TFC is the maximum rate allowed to be used when the UE retransmits after the update, which is recorded as TFC#i (i>=2, i represents the number of transmissions). 35. The method according to claim 30, wherein the E-DPDCH transmission power of the UE during retransmission is equal to the minimum of the virtual TFC (TFC#i) and the TFC actually used during retransmission (TFC#1) The power corresponding to the value, if the power exceeds the maximum power that the UE can use, the UE will transmit with the maximum power it can use. 36. The method according to claim 35, characterized in that the control of the E-DPDCH transmission power is realized by the UE adjusting the power ratio βd _,eu of the E-DPDCH and the DPCCH according to the virtual TFC, for E-DCH and DCH code division multiplexing, in the calculation of β _{d, eu} during retransmission, β _{d, eu} is the minimum value based on the virtual TBS and the actual TBS used during retransmission, that is, min{TBS#1, TBS#i}, calculated. 37. The method according to claim 30, wherein the transmit power of the UE during retransmission is equal to the power corresponding to the virtual TFC, and if the power exceeds the maximum power available to the UE, the UE uses the available Maximum power transmission. 38. The method according to claim 37, characterized in that the control of the E-DPDCH transmission power is realized by the UE adjusting the gain factor β _{d of the E-DPDCH channel according to the virtual TFC, eu} , for E-DCH and DCH For code division multiplexing, in the calculation of β _{d, eu} during retransmission, β _{d, eu} is calculated according to the virtual TBS, that is, TBS#i. 39. A Node B transmitting device that controls retransmission data ROT, in the rate and time scheduling mode, it is characterized in that it also includes a scheduling module, and the scheduling module includes an initial transmission scheduling module and a retransmission scheduling module, wherein the control first time The scheduling command for transmission is output by the first transmission scheduling module, and the scheduling command for controlling retransmission is output by the retransmission scheduling module. 40. A terminal device for controlling retransmission data ROT, in the rate and time scheduling mode, the transmitter of the terminal device includes a β _d,eu generation module, which is used to generate a gain factor β _d,eu of the E-DPDCH channel. 41. The terminal device according to claim 40, characterized in that said β _d,eu generating module comprises: The first transmission β _{d, eu} calculation module calculates the first transmission β _{d, eu} according to the TBS (TBS#1) used for the first transmission; The virtual TBS generation module during retransmission is used to calculate the maximum rate that the Node B expects the UE to achieve from the SA/RG command; During retransmission, the β _{d, eu} calculation module calculates β d, _eu according to the result TBS#i of the virtual TBS generator during retransmission and the actual transmission block TBS#1 used during retransmission; The number selector MUX is used to select and output the β d, _eu results calculated by the first transmission β _{d, eu} calculation module and the retransmission calculation module, and the number of transmission times is used as the control terminal of the number selector MUX. 42. The terminal device according to claim 41, characterized in that the virtual TBS generating module during retransmission is used for: When the scheduling command is SA, set the virtual TBS as the maximum TBS in the TFCS subset corresponding to SA during retransmission. 43. The terminal device according to claim 41, characterized in that the virtual TBS generating module during retransmission is used for: When the scheduling command is RG, set the virtual TBS to, When the RG is UP, the virtual TBS is the corresponding TBS adjusted by a step in the positive direction relative to the maximum rate allowed by the UE during the previous transmission; When RG is DOWN, the virtual TBS is the corresponding TBS adjusted by a step in the negative direction relative to the maximum rate allowed by the UE during the previous transmission; When the RG is DTX, the virtual TBS is the TBS corresponding to the maximum rate allowed by the UE to remain unchanged from the previous transmission; 44. The terminal device according to claim 41, wherein the retransmission time βd _{, eu} calculation module comprises: A small comparator is used to compare the TBS actually used during the input retransmission (TBS#1, which is the same as the first transmission) with the TBS#i output by the virtual TBS generation module, and output the smallest one; β _{d, eu} calculator, calculate β _{d, eu} according to the output of the smaller comparator. 45. The terminal device according to claim 41, wherein the retransmission time βd _{, eu} calculation module comprises: β _d,eu calculator to calculate β _d,eu from the output of the virtual TBS generator.

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