CN101272177B

CN101272177B - Method and device for scheduling user's set

Info

Publication number: CN101272177B
Application number: CN 200710064636
Authority: CN
Inventors: 高卓; 李国庆; 谌丽; 毕海洲
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2007-03-21
Filing date: 2007-03-21
Publication date: 2012-12-19
Anticipated expiration: 2027-03-21
Also published as: CN101272177A

Abstract

The invention discloses a method for scheduling UE, which comprises the steps that: a TTI resource indication field is added in a scheduling instruction; the scheduling instruction containing the indication information about carrier resources is generated after carrier resources and TTI resources are allocated; the TTI resource indication field is set according to the allocated TTI resources and the scheduling instruction is sent to the scheduled UE. The adoption of the method provided by the invention can add the indication information about TTI resources in the scheduling instruction so as to cause the scheduled UE to be informed of TTI resources allocated at the network side by the scheduling instruction, thereby avoiding the fixed delay relation from being adopted to schedule a UE in a TDD mode, thus not only realizing the scheduling of the UE but also providing simplicity and convenience. The invention also discloses a device for scheduling the UE.

Description

Method and device for scheduling user equipment

Technical Field

The present invention relates to the technical field of mobility management for User Equipment (UE) in a Time Division Duplex (TDD) mobile communication system, and in particular, to a method and an apparatus for scheduling UE.

Background

Long Term Evolution (LTE) is an evolving technology being studied by the third generation partnership project (3 GPP) organization. LTE can be divided into two basic modes, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), from the operating mode. The FDD mode is adopted, different frequency bands are occupied by uplink and downlink communication in a frequency domain, and uplink and downlink bidirectional data transmission can be carried out in each time slot in a time domain. In the TDD mode, uplink and downlink communication occupy the same frequency band in a frequency domain, and each time slot can only carry out uplink or downlink unidirectional data transmission in a time domain.

In LTE, resources used for uplink and downlink communication are allocated by a scheduler located in a base station. The physical layer of LTE employs Orthogonal Frequency Division Multiplexing (OFDM) technology, and information about resource allocation that has been determined so far is shown in table 1.

TABLE 1

ID(UE or group specific)	User identification for indicating which user is scheduled
		Resource assignment	Indicating allocated frequency resources (subcarrier sets)
Duration of assignment	Indicating how many time slots the allocated resources are valid

As can be seen from table 1, when the base station transmits resource allocation information to the scheduled UE, the base station only includes indication information of carrier resources and effective time of the carrier resources, and does not include Transmission Time Interval (TTI) resources. After knowing the carrier resources allocated by the base station, the scheduled UE should use the carrier resources for uplink communication in which TTI?

In the FDD mode, since bidirectional uplink and downlink communication can be performed in each TTI, uplink communication of the UE is not restricted, and thus the problem of UE scheduling can be solved by a fixed delay relationship.

In FDD mode, assuming that the scheduler decides to schedule user UE1 and allocates carrier resources and TTI resources for user UE1, the base station will generate scheduling instructions including carrier resource indication information. Wherein, the TTI resources are transmission time intervals TS4, TS5, if the fixed delay is 3 TTIs, the base station sends scheduling instructions to the user UE1 at the transmission time intervals TS1, TS2 respectively; after receiving the scheduling command at the transmission time interval TS1, the user UE1 performs uplink communication at the transmission time interval TS4 by using the carrier resources according to the fixed delay relationship of 3 TTIs; after receiving the scheduling command at the transmission time interval TS2, the user UE1 performs uplink communication using the carrier resource at the transmission time interval TS5 according to the fixed delay relationship of 3 TTIs.

Although the scheduling problem of the UE can be solved by a fixed delay in the FDD mode, in the TDD mode, because only uplink or downlink unidirectional communication can be performed in each TTI, uplink communication of the UE is restricted, and therefore, it is difficult to solve the scheduling problem of the UE by using a fixed delay relationship in the TDD mode.

At present, there is no clear method for implementing UE scheduling in LTE TDD mode.

Disclosure of Invention

In view of this, the technical problem to be solved by the present invention is to provide a method and an apparatus for scheduling a UE, so as to implement scheduling of the UE in the TDD mode of LTE.

A method of scheduling UEs, comprising:

adding TTI resource indication fields in the scheduling instruction, using the number of TTI as the TTI resource indication field, or setting the length of TTI resource indication fields according to the number of all TTI in a subframe, or setting the length of TTI resource indication fields according to the number of TTI controlled by the scheduling instruction;

after carrier resources and TTI resources are allocated, a scheduling instruction comprising carrier resource indication information is generated;

setting TTI resource indication fields according to the allocated TTI resources, and sending scheduling instructions to the scheduled UE;

the TTI resource indication field is used for enabling the scheduled UE to acquire TTI resources allocated by the network side through a scheduling instruction; when the length of the TTI resource indication field is set according to the number of all TTIs in a subframe or the length of the TTI resource indication field is set according to the number of TTIs controlled by the scheduling instruction, setting corresponding bit positions of the TTI resource indication field according to the allocated TTI resources.

Wherein, when the number of TTI is used as the TTI resource indication field: and generating scheduling instructions with the same quantity according to the number of the allocated TTIs, and respectively setting TTI resource indication fields of the scheduling instructions according to the numbers of the allocated TTIs.

When the length of the TTI resource indication field is set according to the TTI number controlled by the scheduling instruction: and setting the length of the TTI resource indication field according to the uplink TTI number controlled by the scheduling instruction, or setting the length of the TTI resource indication field according to the downlink TTI number controlled by the scheduling instruction.

When the length of the TTI resource indication field is set according to the number of all TTIs in a subframe, or the length of the TTI resource indication field is set according to the number of TTIs controlled by the scheduling instruction, after the TTI resource indication field is added in the scheduling instruction, before allocating carrier resources and TTI resources, the method further includes:

informing the UE of relevant information comprising the length of the TTI resource indication field through broadcast information; or,

and when the connection with the UE is established, the UE is informed of the relevant information.

Wherein the setting the corresponding bit of the TTI resource indication field according to the allocated TTI resource comprises:

when the bit is set, allocating TTI resources corresponding to the bit;

when the bit is not set, the TTI resource corresponding to the bit is not allocated.

When the length of the TTI resource indication field is set according to the number of all TTIs in a subframe, or the length of the TTI resource indication field is set according to the number of TTIs controlled by the scheduling instruction: further comprising:

the UE acquires the allocated TTI resources according to setting information of TTI resource indication fields in the scheduling instruction, and the setting information is obtained by setting corresponding bit positions of the TTI resource indication fields according to TTI resources allocated by a scheduler in the scheduling instruction;

and the UE performs related operation in the allocated TTI, and when the time delay between the TTI where the scheduling instruction is located and the TTI indicated in the scheduling instruction is less than the processing time delay of the UE, the UE performs related operation in the corresponding TTI of the next adjacent subframe.

Based on the above method, the present invention further provides a device for scheduling UE, including:

the scheduling instruction unit is used for generating a scheduling instruction comprising carrier resource indication information after a scheduler allocates carrier resources and TTI resources, and adding TTI resource indication fields in the scheduling instruction;

the setting unit is used for setting an indication field of the TTI resources according to the allocated TTI resources, taking the number of the TTI as the indication field, or setting the length of the indication field of the TTI resources according to the number of all the TTI in one subframe, or setting the length of the indication field of the TTI resources according to the number of the TTI controlled by the scheduling instruction;

after the setting unit sets the indication field of TTI resources, the base station sends a scheduling instruction to the scheduled UE;

Wherein, when the number of TTI is used as the TTI resource indication field: the setting unit generates scheduling instructions with the same quantity according to the number of the allocated TTIs, and the TTI resource indication fields of the scheduling instructions are respectively set according to the numbers of the allocated TTIs.

When the length of the TTI resource indication field is set according to the TTI number controlled by the scheduling instruction: the setting unit sets the length of the TTI resource indication field according to the uplink TTI number controlled by the scheduling instruction, or sets the length of the TTI resource indication field according to the downlink TTI number controlled by the scheduling instruction.

When the length of the TTI resource indication field is set according to the number of all TTIs in a subframe, or the length of the TTI resource indication field is set according to the number of TTIs controlled by the scheduling instruction, the apparatus further includes:

a notification unit, configured to notify the UE of relevant information including a TTI resource indication field length through broadcast information; or when the connection with the UE is established, the related information is notified to the UE.

When the setting unit sets the bit position corresponding to the TTI resource indication field according to the allocated TTI resource, when the bit position is set, the TTI resource corresponding to the bit position is allocated, and when the bit position is not set, the TTI resource corresponding to the bit position is not allocated.

By adopting the method and the device provided by the invention, the scheduling instruction comprising the carrier resource indication information can be generated and the TTI resource indication information can be added in the scheduling instruction after the scheduler selects the scheduled UE and allocates the carrier resource and the TTI resource, so that the scheduled UE can acquire the TTI resource allocated by the network side through the scheduling instruction, thereby avoiding scheduling the UE by adopting a fixed time delay relation in a TDD mode, not only realizing the scheduling of the UE, but also being simple and convenient.

Drawings

FIG. 1 is a flow chart of example 1 of the method provided by the present invention;

FIG. 2 is a diagram illustrating a structure of a subframe in a TDD system;

FIG. 3 is a flow chart of embodiment 2 of the method provided by the present invention;

FIG. 4 is a flow chart of embodiment 3 of the method provided by the present invention;

fig. 5 is a schematic view of the apparatus provided by the present invention.

Detailed Description

The basic idea of the invention is that after a scheduler allocates carrier resources and TTI resources to scheduled UE, a scheduling instruction comprising carrier resource indication information is generated; and adding indication information of TTI resources in the scheduling instruction, so that the scheduled UE can acquire the TTI resources allocated by the network side through the scheduling instruction.

In order to make the present invention better understood by those skilled in the art, the method provided by the present invention is specifically described below with reference to example 1, and fig. 1 is a flow chart of example 1.

In step 101, a TTI resource indication field is added to the scheduling instruction, and related information of the TTI resource indication field is set, including:

setting the length of TTI resource indication field according to the number of all TTIs in a subframe, setting the corresponding relation between each bit (bit) in the field and TTI, and setting the TTI resource indication mode.

The TTI resource indication mode is as follows: when the bit is set, namely the bit is set to be 1, the TTI resource corresponding to the bit is allocated; when the bit is not set, it indicates that the TTI resource corresponding to the bit is not allocated.

In step 102, on the network side, the scheduler selects the scheduled UE and allocates carrier resources and TTI resources.

The specific resource allocation strategy is related to a scheduling algorithm adopted by the scheduler, and when performing resource allocation, factors that should be considered generally include: priority of user traffic, amount of buffered data, channel conditions, etc.

In step 103, the base station generates a scheduling instruction and sets the corresponding bit of the TTI resource indication field in the scheduling instruction according to the TTI resource allocated by the scheduler, i.e. the corresponding bit position is "1", and then sends the scheduling instruction to the UE. Wherein, the carrier resource information allocated by the scheduler is included in the scheduling instruction.

In step 104, the UE obtains the TTI resources allocated by the network side according to the setting information of the TTI resource indication field in the scheduling instruction.

In step 105, the UE performs uplink communication using the carrier resource indicated by the scheduling instruction in the TTI allocated by the network side.

In an actual system, under the influence of the processing capability of the device, after receiving the scheduling instruction, the UE needs to complete the action indicated by the scheduling instruction after a period of processing delay. For example, after receiving the scheduling instruction, the UE may execute the scheduling instruction only after completing operations such as assembling, encoding, and modulating the data block, and transmit data in the corresponding TTI by using the allocated carrier resource. Therefore, if the time delay between the TTI in which the scheduling instruction is located and the TTI indicated in the scheduling instruction is less than the device processing time delay, the UE cannot execute the scheduling instruction in the current subframe and perform related operations. In order to enable the UE to work normally, in this case, the UE executes the scheduling command in the corresponding TTI of the next adjacent subframe to perform the relevant operation. And if the time delay between the TTI where the scheduling instruction is located and the TTI indicated in the scheduling instruction is greater than or equal to the processing time delay of the equipment, the UE executes the scheduling instruction on the current subframe and performs related operation.

More specifically, at present, a TDD system includes 7 TTIs in one subframe, as shown in fig. 2, which are transmission time intervals TS0, TS1, TS2, TS3, TS4, TS5, and TS6, respectively. Correspondingly, the TTI resource indication field is set to 7 bits, one bit is used for indicating one TTI resource, and the TTI corresponding to each bit can be set according to the specific requirement. When a bit is set to "1", it indicates that the scheduler allocates the corresponding TTI, and when a bit is set to "0", it indicates that the scheduler does not allocate the corresponding TTI.

Because the TTI resource indication mode is fixed, the TTI resource indication mode can be predefined in the UE, so that the base station does not need to notify the UE of the TTI resource indication mode when the system is operating. If the resource indication mode is not predefined at the UE, the base station needs to inform the UE of the TTI resource indication mode when the system is in operation.

In system operation, it is assumed that the scheduler chooses to schedule user UE1 and allocates carrier resources and TTI resources for user UE 1-transmission time intervals TS1, TS 2. When the base station generates a scheduling command, indication information "0110000" indicating that TTI resources are added to the scheduling command, indicating that the scheduler has allocated transmission time intervals TS1 and TS2 and has not allocated transmission time intervals TS0, TS3, TS4, TS5, and TS 6.

After receiving the scheduling command sent by the base station, the user UE1 learns that the TTI resources allocated by the network side are the transmission time intervals TS1 and TS2 according to the TTI resource indication field "0110000" in the scheduling command, and performs uplink communication in the transmission time intervals TS1 and TS2 by using the carrier resources indicated in the scheduling command.

It should be noted here that the processing delay of the UE1 is assumed to be 3 TTIs;

when a base station sends a scheduling instruction to a user UE1 at a transmission time interval TS4 of a subframe n, TTIs indicated in the scheduling instruction are TS1 and TS2, and since the time delays from the transmission time interval TS4 of the subframe n to the transmission time intervals TS1 and TS2 of the subframe n +1 are both greater than the processing time delay of the user UE1, when the user UE1 completes operations such as data block assembly, coding and modulation, and the like, the transmission time interval TS1 of the subframe n +1 is reached, the user UE1 executes the scheduling instruction at the transmission time intervals TS1 and TS2 of the subframe n +1, and data is sent by using allocated carrier resources;

when the base station sends a scheduling command to the user UE1 at the transmission time interval TS6 of the subframe n, TTIs indicated in the scheduling command are TS1 and TS2, and since the time delay from the transmission time interval TS6 of the subframe n to the transmission time intervals TS1 and TS2 of the subframe n +1 is less than the processing time delay of the user UE1, after the user UE1 completes the operations of assembling, encoding, modulating, and the like of data blocks, the transmission time intervals TS1 and TS2 of the subframe n +1 have been missed, the user UE1 executes the scheduling command at the transmission time intervals TS1 and TS2 of the subframe n +2, and transmits data at the transmission time intervals TS1 and TS2 of the subframe n +2 by using allocated carrier resources.

In embodiment 1, only the uplink scheduling method is described, but it can be seen by those skilled in the art that downlink scheduling can also be implemented based on this method. When downlink scheduling is performed, after the scheduler allocates downlink TTI resources to the scheduled UE, the base station sets the corresponding bit of the TTI resource indication field according to the method described in step 103, and sends a scheduling instruction to the scheduled UE.

The scheduled UE can acquire the downlink TTI resources distributed by the network side according to the setting information of the TTI resource indication field in the scheduling instruction, and receives the information sent by the network side at the downlink TTI distributed by the network side.

For the TDD system, since the number of uplink TTIs in a subframe can be adjusted and configured, in order to save signaling overhead, the length of the TTI resource indication field only needs to be the same as the number of TTIs that can be controlled by the scheduling instruction, and it is not necessary to set 7 bits. This method will be described in detail with reference to example 2, and fig. 3 is a flowchart of example 2.

In step 301, on the network side, a TTI resource indication field is added to the scheduling instruction, and the related information of the TTI resource indication field is set, including: and setting the length of a TTI resource indication field according to the number of the uplink TTIs controlled by the scheduling instruction, and setting the corresponding relation between each bit (bit) in the field and the uplink TTI and the TTI resource indication mode.

In step 302, the UE is notified of the relevant setting information in step 301, which includes: the number of uplink TTIs controlled by the scheduling instruction, the length of a TTI resource indication field, the corresponding relation between each bit in the field and the TTI, and the TTI resource indication mode.

The number of uplink TTIs controlled by the scheduling instruction, the length of the TTI resource indication field, the correspondence between each bit in the field and the uplink TTI, and the TTI resource indication mode may be notified to the user through broadcast information, or the UE may be temporarily notified of the relevant setting information when establishing a connection with the UE.

In step 303, on the network side, the scheduler selects the scheduled UE and allocates carrier resources and TTI resources.

In step 304, the base station generates a scheduling command and sets the corresponding bit of the TTI resource indication field according to the TTI resource allocated by the scheduler in the scheduling command, and then sends the scheduling command to the UE. Wherein, the carrier resource information allocated by the scheduler is included in the scheduling instruction.

In step 305, the UE obtains the TTI resources allocated by the network side according to the setting information of the TTI resource indication field in the scheduling instruction.

In step 306, the UE performs uplink communication using the carrier resource indicated by the scheduling instruction in the TTI allocated by the network side.

And if the time delay between the TTI where the scheduling instruction is located and the TTI indicated in the scheduling instruction is less than the processing time delay of the equipment, the UE executes the scheduling instruction in the corresponding TTI of the next adjacent subframe to perform relevant operation. And if the time delay between the TTI where the scheduling instruction is located and the TTI indicated in the scheduling instruction is greater than or equal to the processing time delay of the equipment, the UE executes the scheduling instruction on the current subframe and performs related operation.

More specifically, assuming that there are 3 uplink TTIs in a subframe, i.e., transmission time intervals TS1, TS2, and TS3, the scheduling command can control the 3 uplink TTIs. Correspondingly, the length of the TTI resource indication field is set to 3 bits, one bit is used for indicating one uplink TTI resource, and the uplink TTI corresponding to each bit can be set according to specific requirements. When a bit is set to "1", it indicates that the scheduler allocates the corresponding TTI, and when a bit is set to "0", it indicates that the scheduler does not allocate the corresponding TTI. And after the setting is finished, the base station informs the UE in the cell of the setting information through broadcast information.

In system operation, it is assumed that the scheduler chooses to schedule user UE1 and allocates carrier resources and TTI resources for user UE 1-transmission time intervals TS1, TS 2. When the base station generates the scheduling command, the indication information "110" of the TTI resource is added to the scheduling command, indicating that the transmission time interval TS1 or TS2 is allocated and the transmission time interval TS3 is not allocated to the scheduler.

After receiving the scheduling command sent by the base station, the user UE1 learns that the TTI resources allocated by the network side are the transmission time intervals TS1 and TS2 according to the TTI resource indication field "110" in the scheduling command, and performs uplink communication in the transmission time intervals TS1 and TS2 by using the carrier resources indicated in the scheduling command.

It should be noted that, since the number of uplink TTIs in a subframe can be adjusted and configured, the length of the TTI resource indication field also needs to be adjusted accordingly, and the length of the TTI resource indication field cannot be predefined in the UE. When the number of uplink TTIs in a subframe changes, the length of the TTI resource indication field must be reset and the UE must be notified by rebroadcasting.

In embodiment 2, only the uplink scheduling method is described, but it can be seen by those skilled in the art that downlink scheduling can also be implemented based on this method. When performing downlink scheduling, at the network side, the set relevant information of the TTI resource indication field includes: and setting the length of a TTI resource indication field according to the number of downlink TTIs controlled by the scheduling instruction, setting the corresponding relation between each bit (bit) in the field and the downlink TTI, and then informing the UE of the related setting information.

After the scheduler allocates downlink TTI resources to the scheduled UE, the base station sets the corresponding bit of the TTI resource indication field according to the method described in step 304, and sends a scheduling instruction to the scheduled UE.

The methods described in embodiments 1 and 2 indicate TTI resources according to the correspondence between each bit in the TTI resource indication field and the TTI. The number of the TTI may also be directly used as the TTI resource indication field, as shown in table 2.

TABLE 2

TTI numbering	TTI resource indication field
		TS0	000
TS1	001
		TS2	010
TS3	011
		TS4	100
TS5	101
		TS6	110
Invalidation	111

The following describes a method for scheduling UE using TTI number as TTI resource indicator field in embodiment 3, and fig. 4 is a flowchart of embodiment 3.

In step 401, the scheduler selects a scheduled UE and allocates carrier resources and TTI resources.

In step 402, the base station generates the same number of scheduling commands for the number of TTIs allocated by the scheduler. Wherein, each scheduling command includes the carrier resource information allocated by the scheduler.

In step 403, the base station adds the number of each TTI allocated by the scheduler to each scheduling command as a TTI resource indication field in a one-to-one manner.

In step 404, the base station transmits all scheduling commands to the UE.

In step 405, the UE obtains the TTI resources allocated by the network side according to the number of the TTI in each scheduling instruction.

In step 406, the UE performs uplink communication using the carrier resource indicated by the scheduling instruction in the TTI allocated by the network side.

And if the time delay of the TTI where each scheduling instruction is located and the TTI indicated in each scheduling instruction is less than the processing time delay of the equipment, the UE carries out uplink communication by using the carrier resource indicated by the scheduling instruction in the corresponding TTI of the next adjacent subframe. And if the time delay between the TTI where the scheduling instruction is located and the TTI indicated in the scheduling instruction is greater than or equal to the processing time delay of the equipment, the UE executes the scheduling instruction on the current subframe and performs related operation.

The TTI resource indication mode which directly takes the number of the TTI as the TTI resource indication field is fixed, so the TTI resource indication mode can be predefined at the UE, and thus, when the system runs, the base station does not need to inform the UE of the TTI resource indication mode. If the resource indication mode is not predefined at the UE, the base station needs to inform the UE of the TTI resource indication mode when the system is in operation.

More specifically, assume that the scheduler chooses to schedule user UE1 and allocates carrier resources and TTI resources for user UE1, Transmission time intervals TS1, TS 2.

At this time, the base station needs to generate two scheduling commands, add the indication information "001" and "010" of the TTI resource to the two scheduling commands, and then send both the two scheduling commands to the user UE 1.

After receiving the two scheduling instructions sent by the base station, the user UE1 learns that the TTI resources allocated by the network side are the transmission time intervals TS1 and TS2 according to the TTI resource indication fields "001" and "010" in the scheduling instructions, respectively, and performs uplink communication in the transmission time intervals TS1 and TS2 by using the carrier resources indicated in the scheduling instructions.

In embodiment 3, only the uplink scheduling method is described, but it can be seen by those skilled in the art that downlink scheduling can also be implemented based on this method. When downlink scheduling is performed, after the scheduler allocates downlink TTI resources to the scheduled UE, the base station adds the number of each downlink TTI allocated by the scheduler to each scheduling instruction as a TTI resource indication field according to the method described in step 403, and sends all scheduling instructions to the scheduled UE.

The scheduled UE can acquire the downlink TTI resources distributed by the network side according to the setting information of the TTI resource indication field in each scheduling instruction, and receives the information sent by the network side at the downlink TTI distributed by the network side.

It can be seen that, in the methods described in embodiments 1 and 2, multiple TTIs can be indicated simultaneously in one scheduling instruction through the TTI resource indication field, but each TTI generally corresponds to the same group of carrier resources, rather than each TTI corresponding to a respective carrier resource, thereby limiting flexibility in resource allocation.

When the number of the TTI indicates the TTI resource, each scheduling instruction can only carry one TTI number, so that a plurality of scheduling instructions are required to indicate a plurality of TTIs. However, the corresponding carrier resources can be allocated separately for each TTI, thereby greatly increasing the flexibility of resource allocation.

Based on the above method, the present invention also provides a corresponding UE scheduling apparatus, and the following describes the apparatus provided by the present invention in detail.

Fig. 5 shows an apparatus for scheduling a UE, which includes a scheduling instruction unit 51 and a setting unit 52.

Adding a TTI resource indication field in a scheduling instruction in advance, and setting relevant information of the TTI resource indication field, wherein the relevant information comprises the following steps: setting the length of TTI resource indication field according to the number of all TTIs in a subframe, setting the corresponding relation between each bit (bit) in the field and TTI, and setting the TTI resource indication mode.

After the scheduler selects the scheduled UE and allocates the carrier resource and TTI resource, the scheduling instruction unit 51 generates a scheduling instruction including carrier resource indication information.

The setting unit 52 sets the corresponding bit of the TTI resource indication field according to the TTI resource allocated by the scheduler, that is, the corresponding bit position is "1", and then the base station sends the scheduling instruction to the UE. And the UE acquires the TTI resources distributed by the network side according to the setting information of the TTI resource indication field in the scheduling instruction. And the UE carries out uplink communication by utilizing the carrier resources indicated by the scheduling instruction in the TTI allocated by the network side.

In an actual system, under the influence of the processing capability of the device, after receiving the scheduling instruction, the UE needs to complete the action indicated by the scheduling instruction after a period of processing delay. For example, after receiving the scheduling instruction, the UE may execute the scheduling instruction only after completing operations such as assembling, encoding, and modulating the data block, and transmit data in the corresponding TTI by using the allocated carrier resource. Therefore, if the delay between the TTI in which the scheduling instruction is located and the TTI indicated in the scheduling instruction is smaller than the device processing delay, the UE cannot execute the scheduling instruction in the current subframe. In order to enable the UE to operate normally, in this case, the UE executes the scheduling instruction at the corresponding TTI of the next adjacent subframe.

In the apparatus shown in fig. 5, only uplink scheduling is described, but it is obvious to those skilled in the art that downlink scheduling can also be implemented based on this apparatus. When downlink scheduling is performed, after the scheduler allocates downlink TTI resources to the scheduled UE, the setting unit 52 sets the corresponding bit of the TTI resource indication field, and the base station sends a scheduling instruction to the scheduled UE.

Because the TTI resource indication mode is fixed, the TTI resource indication mode can be predefined at the UE, so that the TTI resource indication mode does not need to be notified to the UE when the system is running. If the TTI resource indication mode is not predefined in the UE, when the system runs, the TTI resource indication mode needs to be notified to the UE, and at this time, the apparatus should further include a notification unit, configured to notify the UE of the relevant information including the TTI resource indication field length through broadcast information; or when the connection with the UE is established, the related information is notified to the UE.

For the TDD system, since the number of uplink TTIs in a subframe can be adjusted and configured, in order to save signaling overhead, the length of the TTI resource indication field only needs to be the same as the number of uplink TTIs that can be controlled by the scheduling instruction, and the length of the TTI resource indication field does not need to be set according to the number of all TTIs in a subframe. At this time, the apparatus should also include a notification unit configured to notify the UE of the relevant information including the TTI resource indication field length through broadcast information; or when the connection with the UE is established, the related information is notified to the UE.

When downlink scheduling is performed, the length of the TTI resource indication field is only required to be the same as the number of downlink TTIs that can be controlled by the scheduling instruction. After the scheduler allocates downlink TTI resources to the scheduled UE, the setting unit 52 sets the bit of the TTI resource indicator field, and the base station sends a scheduling instruction to the scheduled UE.

When the UE is scheduled, the TTI resource may be indicated by the corresponding relationship between each bit in the TTI resource indication field and the TTI, or the number of the TTI may be directly used as the TTI resource indication field, as shown in table 2.

In this case, after the scheduler selects the scheduled UE and allocates the carrier resource and TTI resource, the scheduling instruction unit 51 generates the same number of scheduling instructions for the number of TTIs allocated by the scheduler. Wherein, each scheduling command includes the carrier resource information allocated by the scheduler.

The setting unit 52 adds the number of each TTI allocated by the scheduler to the TTI resource indication field of each scheduling command in a one-to-one manner.

And the UE can acquire TTI resources distributed by the network side according to the number of the TTI in each scheduling instruction, and carries out uplink communication on the TTI distributed by the network side by using the carrier resources indicated by the scheduling instruction.

In downlink scheduling, after the scheduler allocates downlink TTI resources to the scheduled UE, the setting unit 52 adds the numbers of TTIs allocated by the scheduler to the TTI resource indication fields of the scheduling commands in a one-to-one manner, and the base station transmits all the scheduling commands to the scheduled UE.

The TTI resource indication mode which directly takes the number of the TTI as the TTI resource indication field is fixed, so the TTI resource indication mode can be predefined at the UE, and thus, when the system runs, the UE does not need to be informed of the TTI resource indication mode. If the resource indication mode is not predefined in the UE, the TTI resource indication mode needs to be informed to the UE when the system is in operation.

It can be seen that a plurality of TTIs can be indicated simultaneously in one scheduling instruction through the TTI resource indication field, but each TTI generally corresponds to the same group of carrier resources, rather than each TTI corresponding to respective carrier resources, thereby limiting flexibility in resource allocation.

The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method of scheduling User Equipment (UE), comprising:

adding a Transmission Time Interval (TTI) resource indication field in a scheduling instruction, taking the number of TTI as the TTI resource indication field, or setting the length of the TTI resource indication field according to the number of all TTI in a subframe, or setting the length of the TTI resource indication field according to the TTI number controlled by the scheduling instruction;

2. The method of scheduling a UE of claim 1 wherein, when the number of TTIs is taken as the TTI resource indication field:

and generating scheduling instructions with the same quantity according to the number of the allocated TTIs, and respectively setting TTI resource indication fields of the scheduling instructions according to the numbers of the allocated TTIs.

3. The method of scheduling UE of claim 1 wherein when the length of the TTI resource indication field is set by the number of TTIs controlled by the scheduling instruction:

and setting the length of the TTI resource indication field according to the uplink TTI number controlled by the scheduling instruction, or setting the length of the TTI resource indication field according to the downlink TTI number controlled by the scheduling instruction.

4. The method of scheduling UE of claim 1, wherein when the length of the TTI resource indication field is set according to the number of all TTIs in a subframe or according to the number of TTIs controlled by the scheduling command, the method further comprises, after the TTI resource indication field is added in the scheduling command, before allocating the carrier resources and the TTI resources, the method further comprising:

5. The method of scheduling UE according to any of claims 1, 3, 4, wherein the setting the corresponding bit of TTI resource indication field per allocated TTI resource comprises:

when the bit is set, allocating TTI resources corresponding to the bit;

6. The method of any of claims 1 to 4, wherein when the length of the TTI resource indication field is set according to the number of all TTIs in a subframe or according to the number of TTIs controlled by the scheduling instruction: further comprising:

7. An apparatus for scheduling User Equipment (UE), comprising:

a scheduling instruction unit, configured to generate a scheduling instruction including carrier resource indication information after a scheduler allocates carrier resources and Transmission Time Interval (TTI) resources, and add a TTI resource indication field in the scheduling instruction;

8. The apparatus of claim 7, wherein when the number of TTIs is used as the TTI resource indication field:

the setting unit generates scheduling instructions with the same quantity according to the number of the allocated TTIs, and the TTI resource indication fields of the scheduling instructions are respectively set according to the numbers of the allocated TTIs.

9. The apparatus for scheduling UE of claim 7 wherein when the length of the TTI resource indication field is set by the number of TTIs controlled by the scheduling instruction:

the setting unit sets the length of the TTI resource indication field according to the uplink TTI number controlled by the scheduling instruction, or sets the length of the TTI resource indication field according to the downlink TTI number controlled by the scheduling instruction.

10. The apparatus for scheduling UE according to any of claims 7 to 9, wherein when the length of the TTI resource indication field is set according to the number of all TTIs in a subframe or according to the number of TTIs controlled by the scheduling instruction, the apparatus further comprises:

11. The apparatus for scheduling UE according to claim 7 or 9, wherein the setting unit allocates the TTI resource corresponding to the bit when the bit is set when the corresponding bit of the TTI resource indication field is set according to the allocated TTI resource, and does not allocate the TTI resource corresponding to the bit when the bit is not set.