WO2009129742A1

WO2009129742A1 - A method and device for downlink data transmission

Info

Publication number: WO2009129742A1
Application number: PCT/CN2009/071408
Authority: WO
Inventors: 索士强; 喻晓冬; 肖国军; 丁昱
Original assignee: 大唐移动通信设备有限公司
Priority date: 2008-04-22
Filing date: 2009-04-22
Publication date: 2009-10-29
Also published as: CN101567749A; CN101567749B

Abstract

A method for downlink data transmission is provided, a terminal reports the terminal grade that itself supports and the extended memory indication for denoting the terminal memory size to the base station; the base station obtains the maximum number N of processes supported by downlink according to the proportion of uplink and downlink; according to the terminal grade, the extended memory indication and the maximum number N of processes supported, the base station performs the pre-operation of the memory allocation and the downlink transmission. An user terminal and a base station are also provided. Through the invention, the base station can pertinently adopt the way of memory allocation to allocate the UE memory, and it is avoid that the matched rate of the effective rate approximates to or exceeds 1, and the transmission reliability of the system is improved.

Description

Downlink data transmission method and device

Technical field

The present invention relates to mobile communication technologies, and in particular, to a downlink data transmission method and apparatus in mobile communication. Background of the invention

In the hybrid automatic request retransmission (HARQ) mechanism of the Long Term Evolution (LTE) system, when the base station sends any HARQ process data to the user terminal (UE), the base station delivers the process data multiple times, and each time the data is sent. A part of the process data, after the UE receives the part of the process data sent by the base station for the first time, the UE decodes the received data. If the decoding succeeds, the ACK information is fed back to the base station, and the base station does not send other data of the process; If the decoding fails, the decoded result is stored, and the NACK information is fed back to the base station. After receiving the NACK information, the base station continues to send the next part of the process data of the process to the UE, and the UE saves after receiving the next part of the process data. The result of the last decoding is combined with the process data received this time, and then decoded according to whether the decoding is successful or not, and then reciprocated until the decoding is successful or all the data of the process is received.

In the above LTE system, the base station performs rate matching on the information data of the HARQ process by using a rate matching algorithm with a mother code rate of 1/3, that is, for the N-bit information data, after the rate matching is performed, the formed data transmission The block is 3N bits, and when decoding fails, the maximum amount of data that needs to be stored is 3N bits. It can be seen that the memory capacity set by the UE is relatively large at a rate matching rate of 1/3.

In response to this problem, the FDD system proposes to use the limited buffer rate matching (LBRM) algorithm, that is, after the information data is 1/3 rate matched, the information data and the check data are punctured, so that the remaining Total length of information data and verification data The degree is half of the previous one, and the effective rate matching rate is 2/3. The system performance with 2/3 effective rate matching rate coding can also be guaranteed.

The principle of punching is the end position of the data block composed of the information data and the check data after the rate matching. For example, FIG. 1 is a schematic diagram of full buffer rate matching, in which a shaded portion represents information data, a white portion represents parity data added after 1/3 rate matching, and RV0 in the figure represents a starting point position of the first transmission data. RV1 indicates the starting point position when the process data is transmitted for the second time after receiving the NACK information. 2 is a schematic diagram of puncturing of the LBRM algorithm based on FIG. 1 , in which the latter part of the data of the verification data is punctured and deleted, and when the transmission is performed, the part of the data is no longer transmitted, and the RV0 in the figure and the like are in FIG. The meaning is the same. It should be noted here that the punching performed in Fig. 2 is not performed at a rate matching rate of 2/3, but only a schematic diagram of punching.

After puncturing the process data by using the LBRM algorithm, the effective rate matching rate is 2/3, so that the amount of stored data of each HARQ process in the UE is reduced by half after decoding failure. For the eight processes of the FDD system, the total memory size of the UE can be reduced by half in design, which greatly saves costs.

In the LTE system, the UE terminal is designed to support dual mode of time division duplex TDD and frequency division duplex FDD. Currently, in UE terminal design, TDD mode and FDD mode use the same size memory to store data of multiple processes. When the system is running, if the TDD mode and the FDD mode support the same peak rate transmission, then the data block size transmitted by each process should be the same. However, in the TDD mode, different uplink and downlink time slot ratios correspond to different process numbers, and in some uplink and downlink time slot ratios, the number of processes is higher than 8 (for example, 9, 10, 12, and 15), therefore, if To enable the TDD mode and the FDD mode to support the same peak rate transmission, the LTE terminal designed according to the FDD mode cannot support the condition of more than 8 processes in the TDD mode.

In the face of this situation, if you punch more memory by each punch, Then, when the TDD mode compresses the information data and the check data by using the LBRM algorithm, the corresponding effective rate matching rate corresponds to 9, 10, 12, and 15 processes of 3/4, 5/6, 1 and 5/4, respectively, The three rate values are obviously close to or greater than T, which will lead to a serious decline in system reliability and fail to meet system performance requirements. Summary of the invention

In view of this, the embodiments of the present invention provide a downlink data transmission method, and a corresponding base station and user terminal, which can improve the reliability of data transmission in the TDD mode.

A downlink data transmission method includes:

The base station receives the terminal level supported by the terminal and the extended memory indication for indicating the memory size of the terminal;

The base station obtains the maximum number of processes N supported by the downlink according to the uplink-downlink ratio;

The base station performs a memory allocation pre-operation according to the terminal level, the extended memory indication, and the maximum number of processes N, and performs downlink transmission.

A user terminal, comprising: a terminal level reporting unit, an extended memory indication reporting unit, a memory allocation and a processing unit;

The terminal level upper unit is configured to send the terminal level of the terminal to the base station; the extended memory indication reporting unit is configured to report the extended memory indication information indicating the size of the memory to the base station;

The memory allocation and processing unit is configured to allocate memory for each process and process the received data according to a memory allocation manner sent by the base station.

A base station, comprising: a terminal level receiving unit, an extended memory indication receiving unit, a maximum process number determining unit, a memory pre-allocation unit, and a data scheduling transmission unit,

The terminal level receiving unit is configured to receive a terminal level reported by the terminal, and send the The memory pre-allocation and data scheduling transmission unit;

The extended memory indication receiving unit is configured to receive extended memory indication information reported by the terminal, and send the information to the memory pre-allocation and data scheduling transmission unit;

The maximum process number determining unit is configured to determine a maximum number of processes N corresponding to the current uplink and downlink subframe ratio;

The memory pre-allocation unit is configured to perform a memory allocation pre-operation according to the terminal level fed back by the terminal, the extended memory indication, and the maximum number of processes N determined by the maximum process number determining unit;

The data scheduling transmission unit is configured to perform data scheduling and transmission according to the determined memory size of each process.

According to the technical solution of the foregoing embodiment of the present invention, the base station receives the terminal level supported by the UE and the extended memory indication for the memory size of the terminal, and the base station performs specific memory allocation pre-operation and data scheduling transmission according to the memory size of the terminal. In this way, the memory size of the terminal is different, and the UE can report the memory size of the terminal supported by the UE, and the base station can allocate the memory in the UE in a targeted manner by using the memory allocation manner, thereby avoiding the situation that the effective rate matching rate is close to or exceeds 1. , thereby improving the reliability of system transmission. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of full buffer rate matching.

FIG. 2 is a schematic diagram of puncturing of the LBRM algorithm based on FIG.

FIG. 3 is a general flowchart of a method for downlink data transmission according to an embodiment of the present invention. FIG. 4 is a schematic structural diagram of a UE according to an embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.

FIG. 6 is a specific flowchart of a method for downlink data transmission according to an embodiment of the present invention. Mode for carrying out the invention

In order to make the objects, technical means and advantages of the present invention more comprehensible, the present invention will be further described in detail with reference to the accompanying drawings.

Currently, according to the transport block size and the effective rate matching rate, the standard defines the UE terminal buffer size when NO processes are supported, as described in Table 1 below. The UE type indicates the terminal level supported by the UE. For different terminal levels, the basic memory sizes corresponding to the NO processes are different.

Table 1 Downstream physical layer parameter values of the UE type

In the embodiment of the present invention, a plurality of terminal memory sizes that are selectable by the UE are set, and the UE reports the memory size of the terminal supported by the UE to the base station, and the base station determines a specific memory allocation and data scheduling transmission manner according to the received information.

FIG. 3 is a schematic flowchart of a HARQ process data transmission method according to an embodiment of the present invention. As shown in Figure 3, the process includes:

Step 301: Pre-set a memory size selectable by the UE, and determine, for the UE, any one of the memory sizes.

In this step, for each different terminal level, a plurality of terminal memory sizes are correspondingly set, including a basic memory size supporting a maximum of NO processes and an extended memory size exceeding a maximum of NO processes. The basic memory size is as shown in Table 1; the extended memory size is an optional memory size of the terminal added in the embodiment of the present invention, by expanding the buffer size of the terminal, And it can support more than NO processes. The specific expansion memory size can also have a variety of options, respectively supporting different number of processes. As needed, the extended memory size can be defined as the total memory size corresponding to the UE, or it can be defined as the increased memory size on the basic memory base.

Through the above settings, when designing the LTE terminal, the UE may be selected to support any memory size, that is, the UE's buffer is determined to be any memory size.

Step 302: When performing downlink data transmission in the TDD mode, the UE reports the terminal level supported by the UE and the extended memory indication indicating the size of the memory.

The memory size of the UE is reported to the base station according to the memory size indicated by the preset extended memory indication, and the base station may be notified by means of high layer signaling.

Step 303: The base station receives and determines the memory size of the terminal supported by the UE, and determines the maximum number of processes corresponding to the current uplink and downlink subframe ratio.

The base station determines the terminal memory size supported by the UE on the one hand, and determines the maximum number of processes according to the current uplink and downlink subframe ratio on the other hand.

Step 304: The base station performs a memory allocation pre-operation according to the terminal level, the extended memory indication, and the maximum number of processes N determined in step 303, and performs downlink transmission.

In this step, the base station determines the memory size of the UE and the corresponding number of processes M according to the terminal level and the extended memory indication reported by the UE, and the number of processes M corresponding to the actual memory size of the UE and the maximum number of processes N determined in step 303. The relationship, and the corresponding memory allocation mode in the different relationship between N and M, the base station allocates the memory of the UE, and performs corresponding data scheduling and transmission according to the memory allocation. The operation of allocating the UE memory to the UE is referred to as a memory allocation pre-operation.

So far, the method of transmitting HARQ process data in the embodiment of the present invention ends.

FIG. 4 and FIG. 5 are respectively a schematic structural diagram of a UE and a base station according to an embodiment of the present invention. The UE and the base station may be used to implement the foregoing HARQ process data transmission method. As shown in FIG. 4, the UE includes: a terminal level reporting unit, an extended memory indication reporting unit, a memory allocation, and a processing unit. The terminal level reporting unit is configured to report the terminal level of the terminal to the base station; the extended memory indication reporting unit is configured to report the extended memory indication indicating the size of the memory to the base station; the memory allocation and processing unit is configured to be used according to the base station The memory allocation method allocates memory for the process and processes the received data.

As shown in FIG. 5, the base station includes: a terminal level receiving unit, an extended memory indication receiving unit, a maximum process number determining unit, a memory pre-allocation unit, and a data scheduling transmission unit. The terminal level receiving unit is configured to receive the terminal level reported by the terminal, and send the terminal level to the memory pre-allocation and data scheduling transmission unit. The extended memory indication receiving unit is configured to receive extended memory indication information reported by the terminal, and send the information to the memory pre-allocation and data scheduling transmission unit. The maximum number of processes determining unit is configured to determine the maximum number of processes corresponding to the current uplink and downlink subframe ratio. The memory pre-allocation unit is configured to perform a memory allocation pre-operation according to the terminal level fed back by the terminal, the extended memory indication, and the maximum number of processes N determined by the maximum process number determining unit. The data scheduling transmission unit is configured to perform data scheduling and transmission according to the determined memory size of each process.

The above is a general overview of the embodiments of the present invention, and the specific embodiments of the present invention will be described in detail below with reference to FIG.

Step 601: Calculate, according to the LBRM algorithm, a memory size required by the UE when the number of different processes is supported, and set an optional memory size of the UE, and determine, for the UE, any one of the optional memory sizes.

In the embodiment of the present invention, an extended memory indication indicating a memory size of different terminals is set, and various different extended memory indications correspond to different process numbers. The extended memory indication corresponding to the existing basic memory size is set to not support the extended memory, and the corresponding number of processes is NO; and an extended memory indication corresponding to the number of other processes of the NO process is introduced. When the value of NO is 8, the number of processes greater than NO may be 9, 10, 12 or 15, that is, the corresponding item The number of processes in the pre-TDD mode, of course, you can also choose other processes that are larger than NO.

In this step, the memory size represented by the various extended memory indications needs to be calculated for the number of processes greater than NO. The calculation may be performed according to the LBRM algorithm, where the maximum transport block size remains the same as that shown in Table 1, thereby ensuring the TDD mode and In FDD mode, the system can achieve the same maximum peak rate; the effective rate matching rate can be 2/3, which means that when the memory is properly reduced, certain data is destroyed without affecting system performance.

Specifically, in the embodiment of the present invention, four process numbers are selected in the number of processes greater than NO, and the memory size corresponding to the four process numbers is used as the memory size indicated by the extended memory indication corresponding to the number of processes, specifically the process. The memory size corresponding to the number is calculated as: The basic memory size at the corresponding terminal level is multiplied by the corresponding number of processes and divided by N0. For example, N0=8, newly added 9, 10, 12, and 15 processes supporting more than 8 processes, all possible extended memory indications corresponding to the number of processes greater than NO include: the extended memory size corresponding to the number of processes is 9 The expanded memory size a represents the memory size, the basic memory size is multiplied by 9/8; the corresponding memory number is 10, the extended memory size b, the extended memory indicates the indicated memory size, and the basic memory size is multiplied by 5 /4; The corresponding memory size is 12, the extended memory size c, the extended memory indicates that the memory size is, the basic memory size is multiplied by 4/3; the corresponding memory number is 15, the extended memory size d, the extended memory indication The size of the memory represented is the basic memory size multiplied by 15/8. The specific extended memory indication parameters are shown in Table 2 and Table 3. Among them, the two tables give various optional memory sizes under various terminal levels, and the extended memory size of Table 2 represents the difference between the actual memory size and the basic memory size, and the extended memory size of Table 3 represents The actual memory size.

Table 2 Downstream physical layer parameter values of the UE type TDD mode TDD mode TDD mode TDD mode downlink process NO

Maximum pass process Nx=9 process Nx=10 process Nx=12 process Nx=15

UE

Big block

Type effective speed

Small basic memory

Rate matching extended memory size (bits)

Size

Code rate

Types of

[10040] 1/3 [242,880] [30360] [60720] [121440] [212520] 1

Types of

[50000] 1/3 [1,206,624] [150828] [301656] [603312] [1055796] 2

Types of

[100000] 2/3 [1,206,624] [150828] [301656] [603312] [1055796] 3

Types of

[150112] 2/3 [1,811,232] [226404] [452808] [905616] [1584828] 4

Types of

[300064] 2/3 [3,620,256] [452532] [905064] [1810128] [3167724] 5 Table 3 Downstream physical layer parameter values of UE type

TDD mode TDD mode TDD mode TDD mode Downstream process NO

Maximum pass process Nx=9 process Nx=10 process Nx=12 process Nx=15

UE

Big block

Type effective speed

Small basic memory

Rate matching extended memory size (bits)

Size

Code rate

Types of

[10040] 1/3 [242,880] [273,240] [303,600] [364,320] [455,400] 1

Types of

[50000] 1/3 [1,206,624] [1357,452] [1,508,280] [1,809,936] [2,262,420]

2

Types of

[100000] 2/3 [1,206,624] [1,357,452] [1,508,280] [1,809,936] [2,262,420] 3

Types of

[150112] 2/3 [1,811,232] [2,037,636] [2,264,040] [2,716,848] [3,396,060] 4

Types of

[300064] 2/3 [3,620,256] [4,072,788] [4,525,320] [5,430,384] [6,787,980] 5 The above is the parameter setting for all four extended memory sizes that may be set to the extended memory indication. In fact, in the implementation of the present invention, in addition to the extended memory indication indicating the basic memory size, other extended memory indications do not necessarily include all of the above four types, and only one or several of them are set as needed, then the subsequent UE And the base station will only target the extended memory index Show the operation.

When data transmission is performed in TDD mode, perform the following operations:

Step 602: The UE reports the terminal level supported by the UE and the extended memory indication used to indicate the size of the memory to the base station.

The manner of reporting the terminal level can be implemented in the existing manner, and will not be described here.

For the reporting of the extended memory indication, different reporting information overheads are considered. In the embodiment of the present invention, three types of information reporting schemes are provided, which are reported by using 1-bit information, reporting by 2-bit information, and reporting by using 3-bit information.

When the extended memory indication is reported by using different length information, the corresponding memory size set in step 601 is also different.

The following describes three ways to >3⁄4:

(1) Using 1 bit of information to report

When the extended memory indication is reported by using 1-bit information, two optional memory sizes and two extended memory indications indicating the two memory sizes are set in step 601. The two extended memory indications are not supporting extended memory and supporting extended memory respectively, wherein the memory size represented by the extended memory is not supported as the basic memory size, and the extended memory can be correspondingly required to correspond to the number of arbitrary processes N _x greater than NO, and Calculates the amount of memory represented based on the number of processes.

In the initial stage of system design, the available memory sizes of the two UEs are determined. When the UE reports the extended memory indication, the two values of the 1-bit information respectively represent that the extended memory and the extended memory are not supported. For example, in the initial stage of system design, it is determined that for any type of UE, extended memory may not be supported, or extended memory is supported. After receiving the extended memory indication reported by the UE, the base station determines whether the UE supports extended memory according to the value of the extended memory indication. .

The value of the specific 1-bit extended memory indication may be: reporting the lbit information T, indicating that the UE does not support extended memory, and the memory size represented by the basic memory size; The lbit information '0' is reported, indicating that the UE supports extended memory, and the memory size represented by the memory is the memory size of the N _x processes.

In the FDD system, the dedicated pilot signal (DRS) is used to indicate the dedicated pilot signal (DRS), and the 1 bit is not used in the TDD system. Therefore, the UE can be designed to report the memory information to the base station by using the lbit resource. The control signaling of the system does not add extra overhead. Of course, one-bit high-level signaling can be additionally set for carrying memory information.

In the present reporting mode, since the signaling extended memory indication uses only 1 bit, the impact on signaling overhead is small or has no effect, but the available terminal has less memory type.

(2) Using 2-bit information to report

When the bit information is used to report the extended memory indication, in step 601, four types of UE-selectable memory sizes and four types of extended memory indications indicating the four types of memory sizes are set. The four extended memory indications are: Extended memory is not supported, Extended memory size is supported A, Extended memory size is supported B, Extended memory size is supported. The memory size represented by the extended memory is not supported by the basic memory size, and the number of corresponding processes is NO; the extended memory size A, the extended memory size B, and the extended memory size C are respectively corresponding to the memory size corresponding to the NO. Three Nl, N2, and N3 in the number of processes.

As in the previous (1), in the initial stage of system design, the memory sizes of the four UEs are determined. When the UE reports the extended memory indication, the four values of the 2-bit information respectively represent that the extended memory is not supported. Extended memory size A, extended memory size B, and extended memory size C.

For example, the number of four processes greater than NO is 9, 10, 12, and 15 respectively. The correspondence between the four extended memory indications and the four values of the 2-bit information can be as shown in Table 4.

Table 4 2-bit memory information corresponding to the terminal memory type scheme supported by the UE Bit information ABC supports extended memory size A Supports extended memory size A Supports extended memory size A

00

( Nl=15 ) ( Nl=15 ) ( Nl=12 ) Support for extended memory size B Support for extended memory size B Support for extended memory size B

01

( N2=12 ) ( N2=12 ) ( N2=10 ) Support for extended memory size C Support for extended memory size C Support for extended memory size C

10

( N3=9 ) ( N3=10 ) ( N3=9 )

11 does not support extended memory does not support extended memory does not support extended memory Table 4 shows the three different extended memory indication settings of A, B, C, wherein the selected three processes greater than NO are different, therefore, For the above three options, the number of processes that support the extended memory size A, the extended memory size B, and the extended memory size C are different. In addition, in the present reporting mode, the extended high-level signaling can be carried to the base station by using the extended high-level signaling. Compared with the first reporting mode, the signaling overhead increases, but the memory size that the UE can choose to support increases.

(3) Reporting with 3-bit information

When the extended memory indication is reported by using 3-bit information, in step 601, five kinds of UE-selectable memory sizes and five extended memory indications indicating the five memory sizes are set. The five extended memory indications are: Extended memory is not supported, Extended memory size is supported A, Extended memory size is supported B, Extended memory size is supported C, Extended memory size is supported. The memory size represented by the extended memory is not supported by the basic memory size, and the number of corresponding processes is NO; the extended memory size is eight, the extended memory size B is supported, the extended memory size C is supported, and the extended memory size D is represented by the memory size respectively. Corresponding to the number of four processes Nl, N2, N3, N4 that are greater than NO.

Still taking N0=8, the number of four processes greater than NO is 9, 10, 12, and 15, respectively. When setting the correspondence between the five types of extended memory indications and the five types of 3-bit information, the following settings can be made: When the extended memory indication is reported, the first bit information in the 3-bit memory information indicates whether the UE terminal memory supports the base station. The amount of memory required for slot time transfer, that is, whether it can support 15 processes. When the first bit indicates that the memory size required for the all-slot proportional transmission of the base station is not supported, the last 2 bits of information indicate that the extended memory is not supported, the extended memory indication corresponding to 9 processes, the extended memory indication corresponding to 10 processes, or 12 corresponding Extended memory indication for the process. For example, if the memory size required for the proportion transmission of all the time slots of the base station is supported, the first bit reports the lbit information T, and all the 3 bits information can be expressed as '100, and conversely, if not supported, the first bit reports the lbit information '0,; When the bit information is Ό, the last 2 bits of information '0Γ, '10, '11, and '00' are used to indicate the extended memory indication corresponding to 12 processes, the extended memory indication corresponding to 10 processes, and 9 corresponding The extended memory indication of the process does not support extended memory. The value of the specific 3bits memory information and the extended memory indication may be

In this reporting mode, the added high-level signaling can be used to carry the memory information to the base station. Compared with the first two reporting modes, the signaling overhead is the largest, but the UE can select the most memory.

Step 603, the base station receives and determines an extended memory indication of the UE, and determines the current upper and lower The maximum number of processes corresponding to the row slot ratio.

In this step, according to the extended memory indication reporting manner pre-agreed by the UE and the base station, the base station parses the memory information reported by the UE, and determines the memory size supported by the UE. The specific determination manner is corresponding to the manner in which the terminal memory type is reported in step 602, and is not described here.

Further, the base station obtains the maximum number N of processes supported by the current downlink transmission according to the ratio of uplink and downlink time slots.

The relationship between the specific uplink and downlink time slot ratio and the number of processes is the same as the existing one, as shown in Table 6.

Correspondence between the ratio of uplink and downlink time slots and the maximum number of processes

Step 604: The base station determines whether the extended memory indication of the UE meets the requirement of the maximum number of processes N. If yes, step 605 is performed, otherwise step 606 is performed.

As described above, different terminal memory sizes correspond to different numbers of processes supported. Therefore, according to the memory size corresponding to the terminal level and the memory size corresponding to the extended memory indication, the maximum number of processes M supported by the terminal can be calculated, that is, the number of processes. The extended memory indicates the number of processes corresponding to it. If the number of processes corresponding to the memory size of the UE is greater than or equal to the maximum number of processes N, it is determined that the maximum number of processes is met. Otherwise, the requirement that the maximum number of processes is not met is determined.

In addition, in the initial stage of system design, that is, corresponding to the different relationship between N and M (ie, N≤M or N>M), the memory allocation mode of the UE is set, and the corresponding settings are saved in the UE and the base station; After determining the relative relationship between N and M in this step, the base station and the UE perform memory allocation of the UE according to the saved memory allocation manner. In order to distinguish the operation of the base station and the UE in the description, the operation of allocating the UE memory by the base station is referred to as a memory allocation pre-operation, and the operation of allocating the UE's own memory is referred to as a memory allocation operation.

Step 605: Perform a preset memory allocation pre-operation 1 and perform corresponding data scheduling and transmission, and then perform step 607.

For convenience, the base station operation of this step and the operation of the UE in the corresponding step 607 are introduced together. The memory allocation pre-operation corresponding to N ≤ M is called memory allocation pre-operation 1.

Specifically, the preset memory allocation pre-operation 1 performed by the base station may be: dividing the memory in the UE according to N; after the memory allocation is completed, the base station performs data scheduling and transmission according to the allocation manner, and the UE also follows the N according to the allocation manner. Data processing and storage are divided into memory. Alternatively, the preset memory allocation pre-operation 1 performed by the base station may also be: averaging the memory in the UE according to the M; after the memory allocation is completed, the base station performs data scheduling and transmission according to the allocation mode, and the UE also follows the corresponding M equals memory for data processing and storage.

Step 606: Perform a preset memory allocation pre-operation 2, and perform corresponding data scheduling and transmission; and then perform step 107.

For convenience, the base station operation of this step and the operation of the UE in the corresponding step 607 are introduced together. The memory allocation pre-operation corresponding to N>M is called memory allocation pre-operation 2, and the memory allocation operation is called memory allocation operation. 2. Specific pre-configured memory allocation pre-operations 2 The following options can be considered:

a. The memory allocation pre-operation 2 performed by the base station is: dynamically allocating the memory of each process in the UE, that is, according to the number of processes that the UE terminal can support, the memory size of each process is unevenly distributed, and the specific allocation mode is sent to Specifically, the unequal memory may be allocated to processes of different service types according to different service types, for example, allocate less memory for voice data and allocate larger memory for video data. Then, the base station according to the dynamic allocation result Data scheduling and transmission. The UE allocates memory according to the dynamic memory allocation mode sent by the base station, and performs data reception and processing according to the memory allocation, or clears the data information in the process of successful transmission in time. For example, after a process data transmission succeeds, the process is cleared. The occupied memory is allocated to other processes.

b. The method of limiting the peak transmission rate of some or all processes, the memory allocation pre-operation 2 performed by the specific base station is: according to the number of processes N equal division of memory, reducing the modulation and coding mode, performing data scheduling and transmission; for example, transmitting the peak rate Restricted to a preset threshold, not transmitted in the highest modulation encoding, this can reduce the memory size occupied by each process, so that limited memory resources support more processes. Then, the base station performs data scheduling and transmission according to the memory allocation, and the UE divides the memory according to N, and performs corresponding data receiving and processing.

c. The memory allocation pre-operation 2 performed by the base station is: according to the number of processes N, the LBRM rate matching rate is increased, and the LBRM rate matching rate is sent to the UE in a valid LBRM rate matching rate range; for example, In the range of LBRM rate matching rate of 3/4, try to increase the LBRM rate matching rate, that is, to remove more bits for each data block transmitted by each process, so as to reduce the data size of each process, so that the UE terminal memory has enough Space can store more data information for the number of processes. Then, the base station performs data scheduling and transmission according to the memory allocation mode. The UE divides the memory according to the N, and decodes according to the LBRM rate matching rate delivered by the base station.

d. The memory allocation pre-operation 2 performed by the base station is: dividing the memory in the UE according to M; then, the base station performs data scheduling and transmission according to the maximum number of processes N; the UE divides the memory according to M, for the number of processes beyond M And transmitting the erroneous process data, directly discarding, and feeding back the NACK information to the base station; for example, the number of processes M corresponding to the terminal memory type supported by the UE is 8, and the maximum number of processes N determined according to the ratio of the uplink and downlink time slots is 10, The base station equally divides the memory in the UE according to the eight processes, and performs scheduling according to the maximum number of processes 10, in the UE, For the last two processes other than 8, if the decoding fails, the data of the process is directly discarded and the NACK information is fed back. In this way, the reliability requirements of data transmission can be well guaranteed for the first M processes, but the data transmission performance may be poor for the latter NM processes.

e. The memory allocation pre-operation performed by the base station 2 is: averaging the memory in the UE according to the maximum number of processes; then, the base station performs data scheduling and transmission according to the memory allocation manner. The UE divides the memory according to N, and stores data according to the allocated memory size of each process. If the data exceeds the memory size, the data is directly discarded. When any process retransmits the data multiple times, the partial merge is performed according to the memory size. For example, the number of processes M corresponding to the terminal memory type supported by the UE is 9, and the maximum number of processes N determined according to the ratio of the uplink and downlink time slots is 10, and the base station divides the memory by 10 according to the maximum number of processes, and performs according to the maximum number of processes 10 Scheduling and data transmission, the terminal stores according to the memory size of each process, discards the latter part of data in each process, and partially merges according to the memory size when merging multiple retransmission data. Compared with mode d, the data transmission reliability of all N processes is relatively average.

f. The memory allocation pre-operation performed by the base station 2 is: configuring the number of downlink processes, and notifying the number of processes according to the number of processes in the process, and then notifying the terminal to the terminal; then, the base station performs data scheduling and transmission according to the configured number of downlinks. The UE divides the memory according to the number of processes sent by the base station, and performs data reception and processing.

Step 607: The terminal performs an actual memory allocation operation according to a preset memory allocation pre-operation, and performs a data storage operation.

The specific receiving and processing modes have been introduced in the foregoing steps 605 and 606, and will not be described here.

So far, the method flow of the embodiment of the present invention ends. The above specific method flow can be implemented in the user terminal and base station shown in Figs. 4 and 5.

The embodiment of the present invention provides multiple optional terminal memory sizes for the UE and the base station. The UE uses a small number of information bits to indicate the terminal memory size supported by the UE. The base station can determine the memory size supported by the UE according to the extended memory indication reported by the UE in time, and change the corresponding UE memory allocation scheme and transmission mode, thereby avoiding the effective rate matching rate being close. Or more than 1, to improve the reliability of system transmission.

While the invention has been illustrated and described with reference to the preferred embodiments embodiments The spirit and scope of the invention as defined by the appended claims.

Claims

Claim

A downlink data transmission method, characterized in that the method comprises:

The method according to claim 1, wherein the base station receives the extended memory indication reported by the terminal: the terminal performs the reporting by using 1-bit information, and the two states of the 1-bit information are respectively The delegate does not support extended memory and supports extended memory.

The method according to claim 2, wherein the memory size represented by the unsupported extended memory is a basic memory size preset by the system;

The memory size represented by the extended memory is corresponding to one of the four downlink processes that are greater than NO, and the NO is the number of processes corresponding to the basic memory size.

The method according to claim 1, wherein the base station receives the extended memory indication reported by the terminal: the terminal performs the reporting by using 2-bit information, and the four states of the 2-bit information are respectively The representative does not support extended memory, supports extended memory size A, supports extended memory size B, and supports extended memory size C.

The method according to claim 4, wherein the memory size represented by the unsupported extended memory is a basic memory size preset by the system;

The memory size represented by the extended memory size A, the extended memory size B, and the extended memory size C respectively corresponds to three of the four downlink processes greater than NO, and the NO is the basic memory size. The number of corresponding processes.

6. The method of claim 1 wherein:

The extended memory indication reported by the base station receiving terminal is: the terminal uses a 3-bit letter The information is reported, and the five states of the 3-bit information respectively represent that the extended memory is not supported, the extended memory size A, the extended memory size B, the extended memory size C, and the extended memory size D are supported.

The method according to claim 6, wherein the memory size represented by the unsupported extended memory is a basic memory size preset by the system;

The memory size represented by the extended memory A, the extended memory B, and the extended memory C is respectively equal to the number of four downstream processes greater than NO, and the NO is the number of processes corresponding to the basic memory size.

8. The method of claim 3, 5 or 7, wherein the method further comprises:

Multiply the basic memory size by the number of processes corresponding to any extended memory indication and divide by NO. The result of the calculation is used as the memory size indicated by any of the extended memory indications.

The method according to claim 1, wherein the base station performs a memory allocation pre-operation according to the terminal level, the extended memory indication, and the maximum number of processes N fed back by the terminal, and performs downlink transmission. Includes:

The base station calculates the maximum number of processes M supported by the terminal according to the memory size corresponding to the terminal level and the memory size corresponding to the extended memory indication;

The base station determines whether the maximum number of processes M supported by the terminal satisfies the requirement of the maximum number of processes N, and if so, performs memory allocation pre-operation 1 and corresponding downlink transmission; otherwise, performs memory allocation pre-operation 2 and corresponding downlink transmission.

The method according to claim 9, wherein the method further comprises: the terminal performing an actual memory allocation operation according to a memory allocation pre-operation of the base station, and performing a data processing operation.

The method according to claim 9, wherein the base station performs memory allocation pre-operation 1 and the corresponding downlink transmission is: averaging the memory in the UE according to N or M, And perform corresponding downlink transmission according to the allocated memory.

The method according to claim 9, wherein the performing the memory allocation pre-operation 2 and the corresponding downlink transmission on the base station side is: the base station divides the memory according to the number of processes N, and reduces the modulation and coding mode for downlink transmission;

Alternatively, the base station divides the memory according to the number of processes N, increases the effective rate matching rate of the LBRM in the effective range, and reduces the length of each transmission information for downlink transmission.

13. The method of claim 10, wherein

The base station performs the memory allocation pre-operation 2 and the corresponding downlink transmission: the base station divides the memory according to the process number M, and performs downlink data scheduling and transmission according to the process number N;

The terminal performs the actual memory allocation operation according to the memory allocation pre-operation of the base station, and the data processing operation includes: the terminal divides the memory according to the number of processes M, and the process data that exceeds the number of processes M and is transmitted incorrectly Directly discard and feed back NACK information to the base station.

14. The method of claim 10, wherein

The base station performs the memory allocation pre-operation 2 and the corresponding downlink transmission is: the base station divides the memory according to the number of processes N, and performs corresponding downlink transmission according to the allocated memory;

The terminal performs an actual memory allocation operation according to the memory allocation pre-operation of the base station, and performs related data storage operations, including: the terminal divides the memory according to the number of processes N, and partially discards the data exceeding the memory size; When the data is merged, all the newly arrived data and the stored data are partially merged.

15. The method of claim 10, wherein

The base station performs the memory allocation pre-operation 2 and the corresponding downlink transmission is: the base station configures the number of downlink processes, divides the memory according to the number of the processes, and notifies the terminal to the number of processes, and performs corresponding downlink transmission according to the allocated memory;

The terminal performs an actual memory allocation operation according to a memory allocation pre-operation of the base station, and advances The storage operation of the row-related data is as follows: The terminal receives the number of processes sent by the base station, performs an actual memory allocation operation according to the number of the processes, and performs data processing operations.

The terminal level receiving unit is configured to receive a terminal level reported by the terminal, and send the terminal level to the memory pre-allocation and data scheduling transmission unit;

The memory pre-allocation unit is configured to perform a memory allocation pre-operation according to the terminal level fed back by the terminal, the extended memory indication, and the maximum number N of processes determined by the maximum process number determining unit;