CN110505693A - Resource configuration method and device for control channel - Google Patents

Abstract

The present application discloses a control channel resource configuration method and device, wherein the method includes: a. Judging whether it is the first time to allocate resources for the UE to be scheduled, if so, go to step b, otherwise, go to step c; b , determine the PDCCH search space length and the corresponding PDCCH search space for this transmission authorization for the UE, allocate PDSCH resources for the UE according to the PDCCH search space, and notify the PDCCH search space to the UE by starting DCI; c, judge Whether it is necessary to change the PDCCH starting subband number of the UE, if so, allocate the uplink and downlink resources for the next scheduling cycle for the UE, and use the same uplink and downlink grants for the scheduling information corresponding to the uplink and downlink resources and the corresponding PDCCH starting position. The DCI is sent to the UE, otherwise, the scheduling information corresponding to the uplink and downlink resources allocated to the UE last time and the corresponding PDCCH starting position are sent to the UE through the same uplink and downlink authorized DCI. The invention can meet the needs of the users of the industry private network.

Description

Resource configuration method and device for control channel

technical field

The present invention relates to mobile communication technology, and in particular, to a method and device for resource configuration of a control channel.

Background technique

The industry private network is a wireless private network proposed for applications in different industries. Compared with the common wireless network, the industry private network has many characteristics, such as: narrow frequency band, low frequency point, high capacity and low delay. The services supported by the network generally have low rates and are less sensitive to delays. The main design purpose of the existing LTE network is to meet the needs of the broadband mobile Internet and provide users with a high-bandwidth and high-response speed surfing experience. The network cannot meet the needs of industrial applications. The specific analysis is as follows.

Due to the low rate of the industry service itself, if the existing LTE process and scheduling method are used to transmit a unit amount of data, the terminal energy consumption and network signaling overhead are too high. Because industry private network terminals are limited by complexity and power consumption, most industry private network terminals cannot occupy all frequency points, and only support a small number of frequency points in the entire frequency band, which can not only meet the speed requirements but also make the terminal equipment simple , low power consumption. In this way, if the physical downlink control channel (PDCCH) is sent in the entire frequency band, some terminals cannot be searched. However, if the control channel is scheduled to occupy the same time-frequency resource every time, when there is narrowband interference at the location of the physical downlink control channel, the problem of affecting the correct demodulation of the PDCCH will exist, thereby affecting the transmission quality of the UE.

Since the time-frequency resources used by the PDCCH are not pre-allocated by the system, an authorization needs to be issued to notify the resource location of the PDCCH. Each time the starting subband of the PDCCH is changed, a separate DCI needs to be sent, thus causing a waste of resources.

It can be seen that the resource allocation method of the control channel in the existing LTE system is not suitable for the industry private network.

SUMMARY OF THE INVENTION

In view of this, the main purpose of the present invention is to provide a control channel resource configuration method and device, which can effectively save DCI resources and improve the communication quality of the UE.

In order to achieve the above object, the technical scheme proposed by the present invention is:

A resource configuration method for a control channel, comprising:

a. Determine whether it is the first time to allocate resources for the user equipment UE to be scheduled, and if so, go to step b, otherwise, go to step c;

b. Determine the length of the PDCCH search space and the corresponding PDCCH search space for the current transmission authorization for the UE, allocate PDSCH resources to the UE according to the PDCCH search space, and notify the PDCCH search space by enabling downlink control information DCI to UE;

c, according to the channel quality of the current frame and the priority of the UE, determine whether it is necessary to change the PDCCH starting subband number of the UE, if so, go to step d, otherwise, go to step e;

d. Allocate the uplink and downlink resources of the next scheduling period to the UE, send the scheduling information corresponding to the uplink and downlink resources and the corresponding PDCCH starting position to the UE through the same uplink and downlink grant DCI, and end the UE resource configuration;

e. Send the scheduling information corresponding to the uplink and downlink resources allocated to the UE last time and the corresponding PDCCH starting position to the UE through the same uplink and downlink grant DCI, and end the resource configuration of the UE.

Preferably, in step b, determining the length of the PDCCH search space for the current transmission authorization for the UE includes:

When the UE has both uplink data and downlink data to be sent, according to the CQI reported by the UE, the aggregation level of the PDCCH sent this time, that is, the frequency domain repetition times is obtained, and the aggregation levels N _{UL_DCI} and N _{DL_DCI} of the uplink and downlink authorization are obtained respectively. ; According to the strategy of preferentially placing uplink authorization, according to the N _{UL_DCI} , N _{DL_DCI} and the preset number of subbands pdcch_span occupied by the PDCCH, determine the length of the PDCCH search space for this transmission authorization;

When the UE only has uplink data, obtain the PDCCH aggregation level N _{UL_DCI} of the uplink authorization sent this time according to the CQI reported by the UE, and use the obtained N _{UL_DCI} as the PDCCH search space length of the transmission authorization this time;

When the UE only has downlink data, according to the CQI reported by the UE, the PDCCH aggregation level N _{DL_DCI} of the downlink authorization sent this time is obtained, and the obtained N _{DL_DCI is} used as the PDCCH search space length of the transmission authorization this time.

Preferably, according to the N _{UL_DCI} , N _{DL_DCI} and the preset number of subbands pdcch_span occupied by the PDCCH, determining the length of the PDCCH search space authorized for this transmission includes:

If N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span, the length of the PDCCH search space authorized by this transmission is the sum of N _{UL_DCI} and N _{DL_DCI} ;

If N _{UL_DCI} +N _{DL_DCI} >pdcch_span, the length of the PDCCH search space authorized by this transmission is N _{UL_DCI} .

Preferably, when the UE has both uplink data and downlink data to be sent, if N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span, the start DCI carries the length of the PDCCH search space, within the length of the PDCCH search space according to: The sequence of the uplink grant followed by the downlink grant carries the grant indicating PDSCH/PUSCH data transmission.

Preferably, allocating PDSCH resources to the UE according to the search space includes:

When the UE has downlink services, the UE is allocated PDSCH resources by using the subband resources after the PDCCH search space currently determined for the UE.

Preferably, the starting DCI includes: the starting subband number First_f of the PDCCH, the number of subbands occupied by the PDCCH pdcch_span, the period factor PDCCH-StartF, and the number of repetition frames PDCCH-NumRepetitions.

Preferably, the judging in step c whether it is necessary to change the PDCCH starting subband number of the UE includes:

If the channel quality of the UE changes and the change range exceeds a preset range, or the resources allocated for the UE are preempted, it is determined that the PDCCH starting subband number of the UE needs to be changed.

Preferably, in step d, the uplink and downlink authorized DCI uses the First_f field to carry the starting position of the PDCCH, and uses other fields except the First_f field to carry the scheduling information corresponding to the uplink and downlink resources;

In step e, the uplink and downlink grant DCI uses the First_f field to carry the starting position of the PDCCH, and uses other fields except the First_f field to carry the scheduling information corresponding to the uplink and downlink resources.

A resource configuration device for a control channel, comprising:

a first judging unit, configured to judge whether it is the first time to allocate resources for the user equipment UE to be scheduled, and if so, trigger the execution of the initial resource allocation unit, otherwise, trigger the execution of the second judging unit;

The initial startup configuration unit is used to determine the length of the PDCCH search space and the corresponding PDCCH search space for the current transmission authorization for the UE, allocate PDSCH resources to the UE according to the PDCCH search space, and use the PDCCH search space to start the The downlink control information DCI is notified to the UE, and the second judgment unit is triggered to execute;

The second judging unit is used for judging whether it is necessary to change the PDCCH starting subband number of the UE according to the channel quality of the current frame and the priority of the UE, and if so, triggering the execution of the changing resource configuration unit, otherwise, triggering Unaltered resource hive execution;

A change resource configuration unit, used for allocating uplink and downlink resources for the next scheduling cycle to the UE, and sending the scheduling information corresponding to the uplink and downlink resources and the corresponding PDCCH starting position to the UE through the same uplink and downlink grant DCI UE;

The unmodified resource configuration unit is used to send the scheduling information corresponding to the uplink and downlink resources allocated to the UE last time and the corresponding PDCCH starting position to the UE through the same uplink and downlink grant DCI.

Preferably, the initial startup configuration unit is used to obtain, according to the CQI reported by the UE, the aggregation level of the PDCCH sent this time, that is, the frequency domain repetition times, when the UE has both uplink data and downlink data to be sent, Obtain the aggregation levels N _{UL_DCI} and N _{DL_DCI} of the uplink and downlink grants respectively; according to the policy of prioritizing the uplink grant, according to the N _{UL_DCI} , N _{DL_DCI} and the preset number of subbands pdcch_span occupied by the PDCCH, determine the PDCCH search for this transmission grant space length; when the UE only has uplink data, according to the CQI reported by the UE, obtain the PDCCH aggregation level N _{UL_DCI} of the uplink authorization sent this time, and use the obtained N _{UL_DCI} as the PDCCH search space length of the transmission authorization this time; when When the UE only has downlink data, according to the CQI reported by the UE, the PDCCH aggregation level N _{DL_DCI} of the downlink authorization sent this time is obtained, and the obtained N _{DL_DCI is} used as the PDCCH search space length of the transmission authorization this time.

Preferably, the initial startup configuration unit is used to determine that the length of the PDCCH search space authorized for this transmission is the sum of N _{UL_DCI} and N _{DL_DCI} if N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span; if N _{UL_DCI} +N _{DL_DCI} >pdcch_span , then it is determined that the length of the PDCCH search space authorized for this transmission is N _{UL_DCI} .

Preferably, the initial startup configuration unit is used for when the UE has both uplink data and downlink data to be sent, if N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span, the startup DCI carries the length of the PDCCH search space, Within the length of the PDCCH search space, the grants indicating PDSCH/PUSCH data transmission are carried in the order of uplink grants and then downlink grants.

Preferably, the initial startup configuration unit is configured to allocate PDSCH resources to the UE by using the subband resources after the PDCCH search space currently determined for the UE when the UE has downlink services.

Preferably, the starting DCI includes: the starting subband number First_f of the PDCCH, the number of subbands occupied by the PDCCH pdcch_span, the period factor PDCCH-StartF, and the number of repetition frames PDCCH-NumRepetitions.

Preferably, the second judging unit is configured to judge that the PDCCH starting point of the UE needs to be changed if the channel quality of the UE changes and the change range exceeds a preset range, or the resources allocated for the UE are preempted. The first sub-band number.

Preferably, the resource configuration unit is changed to carry the starting position of the PDCCH by using the First_f field in the uplink and downlink authorized DCI, and use other fields in the uplink and downlink authorized DCI except the First_f field to carry the uplink and downlink. Scheduling information corresponding to the row resource;

Unchanged resource configuration unit, used to carry the starting position of the PDCCH by using the First_f field in the uplink and downlink authorized DCI, and use other fields in the uplink and downlink authorized DCI to carry the corresponding uplink and downlink resources except the First_f field scheduling information.

To sum up, the method and device for resource configuration of the control channel proposed by the present invention change the starting position of the frequency domain of the control channel PDCCH according to the channel quality of the current frame and the priority of the UE, and pass an uplink and downlink grant The DCI also informs the UE of the scheduling information corresponding to the uplink and downlink resources allocated to the UE and the corresponding starting position of the PDCCH, so that the DCI resources can be effectively saved and the communication quality of the UE can be improved.

Description of drawings

1 is a schematic flowchart of a method according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic flowchart of a method according to an embodiment of the present invention. As shown in FIG. 1 , the resource configuration method for a control channel implemented by this embodiment mainly includes:

Step 101 , determine whether it is the first time to allocate resources for the user equipment (UE) to be scheduled, if yes, go to step 102 , otherwise, go to step 103 .

In this step, for a UE to be scheduled, it is necessary to determine whether resources have been allocated to the UE before, that is, whether the UE is currently scheduled for the first time.

Step 102: Determine the length of the PDCCH search space and the corresponding PDCCH search space for this transmission authorization for the UE, allocate PDSCH resources for the UE according to the PDCCH search space, and pass the PDCCH search space through the start downlink control information ( DCI) is notified to the UE.

In this step, the difference from the existing system is that the start-up DCI is introduced to indicate the resource location of the PDCCH, that is, the PDCCH search space, for the UE scheduled for the first time.

Here, the start-up DCI is only sent once when the UE is initially scheduled to indicate the resource location of the PDCCH, that is, the PDCCH search space. Preferably, the starting DCI may include: the starting subband number First_f of the PDCCH, the number of subbands occupied by the PDCCH pdcch_span, the period factor PDCCH-StartF, and the number of repetition frames PDCCH-NumRepetitions.

Preferably, in practical applications, according to the data transmission requirements of the UE, the following methods can be used to distinguish the following three specific transmission situations, and determine the length of the PDCCH search space authorized for this transmission for the UE:

1. When the UE has both uplink data and downlink data to be sent, according to the CQI reported by the UE, the aggregation level of the PDCCH sent this time, that is, the frequency domain repetition times, is obtained. The aggregation level N _{UL_DCI} and N _{DL_DCI} : According to the policy of prioritizing uplink grants, according to the N _{UL_DCI} , N _{DL_DCI} and the preset number of subbands pdcch_span occupied by the PDCCH, determine the length of the PDCCH search space for the grant sent this time.

Here, considering that some services of the industry private network, such as the millisecond-level precise negative control service, have high requirements on the delay, if the control channel is sent first, the data channel sent in the next wireless frame will introduce a fixed delay of one wireless frame, and It cannot meet the delay requirements of the service; on the other hand, the uplink rate of the industry network is usually higher than the downlink rate. In order to meet the above-mentioned high uplink rate requirements of the industry private network, when both uplink and downlink data need to be sent at the same time, it is necessary to adopt the strategy of prioritizing the uplink grant, and configure the PDCCH search space to prioritize the transmission of the uplink and ensure that the Uplink rate requirements of private network users. Specifically, in order to achieve the above purpose, the following method can be adopted to determine the length of the PDCCH search space authorized for this transmission according to the N _{UL_DCI} , N _{DL_DCI} and the preset number of subbands pdcch_span occupied by the PDCCH:

If N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span, the length of the PDCCH search space authorized by this transmission is the sum of N _{UL_DCI} and N _{DL_DCI} ;

If N _{UL_DCI} +N _{DL_DCI} >pdcch_span, the length of the PDCCH search space authorized by this transmission is N _{UL_DCI} .

Preferably, considering that the industry private network (such as the power network) has many uplink services, the search space of the control channel can adopt the method of placing the uplink authorization first, and then placing the downlink authorization. tune.

When the UE has both uplink data and downlink data to be sent, if N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span, the start DCI carries the length of the PDCCH search space, and within the length of the PDCCH search space, the length of the PDCCH search space is based on the uplink grant first The sequence of downlink grants carries grants indicating PDSCH/PUSCH data transmission.

2. When the UE only has uplink data, obtain the PDCCH aggregation level N _{UL_DCI} of the uplink authorization sent this time according to the CQI reported by the UE, and use the obtained N _{UL_DCI} as the PDCCH search space length of the transmission authorization this time.

3. When the UE only has downlink data, obtain the PDCCH aggregation level N _{DL_DCI} of the downlink authorization sent this time according to the CQI reported by the UE, and use the obtained N _{DL_DCI} as the PDCCH search space length of the transmission authorization this time.

In step 102, PDSCH resources are allocated to the UE according to the PDCCH search space, so that the control channel and the data channel can be sent in the same frame, thereby reducing the transmission delay. Preferably, for a user supporting multiple subbands in the frequency domain, the following method can be used to allocate PDSCH resources to the UE according to the PDCCH search space:

When the UE has downlink services, the UE is allocated PDSCH resources by using the subband resources after the PDCCH search space currently determined for the UE.

The specific calculation of the above N _{UL_DCI} and N _{DL_DCI} can be implemented by using an existing method, and details are not described herein again.

The preset number of subbands pdcch_span occupied by the PDCCH is used to limit the maximum length of the search space, and the setting method thereof is the same as that of the existing system.

Step 103 , according to the channel quality of the current frame and the priority of the UE, determine whether the PDCCH starting subband number of the UE needs to be changed, if so, go to step 104 , otherwise, go to step 105 .

In this step, it is necessary to judge whether it is necessary to change the starting position of the frequency domain of the control channel PDCCH according to the channel conditions of the current frame or the requirements of the user priority. , the channel resources can be adjusted for it to ensure its communication quality. Specifically, the following method can be used to judge whether the PDCCH starting subband number of the UE needs to be changed:

If the channel quality of the UE changes and the change range exceeds a preset range, or the resources allocated for the UE are preempted, it is determined that the PDCCH starting subband number of the UE needs to be changed.

The above preset range can be set by those skilled in the art according to actual needs.

Step 104: Allocate the uplink and downlink resources of the next scheduling cycle to the UE, send the scheduling information corresponding to the uplink and downlink resources and the corresponding PDCCH start position to the UE through the same uplink and downlink grant DCI, and end the process. Describe the resource configuration of the UE.

In this step, when the starting subband number of the PDCCH of the UE needs to be changed, it will be necessary to re-allocate uplink and downlink resources to the UE, and the uplink and downlink resources include PDSCH, PDCCH and PUSCH resources. And, through the same uplink and downlink grant DCI, the scheduling information corresponding to the reassigned uplink and downlink resources (including scheduling information such as modulation and coding methods) and the corresponding PDCCH starting position are sent to the UE. In this way, the DCI resources can be saved, and the flexible configuration of the PDCCH channel can be realized at the same time.

Preferably, in step 104, the first_f field in the uplink and downlink grant DCI may be used to carry the starting position of the PDCCH, and other fields except the First_f field may be used to carry the scheduling information corresponding to the uplink and downlink resources.

Step 105: Send the scheduling information corresponding to the uplink and downlink resources allocated to the UE last time and the corresponding PDCCH starting position to the UE through the same uplink and downlink grant DCI, and end the resource configuration of the UE.

In this step, when the PDCCH starting subband number of the UE does not need to be changed, the resources and the PDCCH search space allocated for the UE last time will be directly continued. In addition, the same uplink and downlink grant DCI is sent to the UE, so as to save DCI resources.

Preferably, in step 105, the first_f field in the uplink and downlink grant DCI may be used to carry the starting position of the PDCCH, and other fields except the First_f field may be used to carry the scheduling information corresponding to the uplink and downlink resources.

FIG. 2 is a schematic structural diagram of an apparatus for configuring resources of a control channel corresponding to the above method embodiment. As shown in FIG. 2 , the apparatus includes:

a first judging unit, configured to judge whether it is the first time to allocate resources for the user equipment UE to be scheduled, and if so, trigger the execution of the initial resource allocation unit, otherwise, trigger the execution of the second judging unit;

The initial startup configuration unit is used to determine the length of the PDCCH search space and the corresponding PDCCH search space for the current transmission authorization for the UE, allocate PDSCH resources to the UE according to the PDCCH search space, and use the PDCCH search space to start the The downlink control information DCI is notified to the UE, and the second judgment unit is triggered to execute;

The second judging unit is used for judging whether it is necessary to change the PDCCH starting subband number of the UE according to the channel quality of the current frame and the priority of the UE, and if so, triggering the execution of the changing resource configuration unit, otherwise, triggering Unaltered resource hive execution;

A change resource configuration unit, used for allocating uplink and downlink resources for the next scheduling cycle to the UE, and sending the scheduling information corresponding to the uplink and downlink resources and the corresponding PDCCH starting position to the UE through the same uplink and downlink grant DCI UE;

The unmodified resource configuration unit is used to send the scheduling information corresponding to the uplink and downlink resources allocated to the UE last time and the corresponding PDCCH starting position to the UE through the same uplink and downlink grant DCI.

Preferably, the initial startup configuration unit is used to obtain, according to the CQI reported by the UE, the aggregation level of the PDCCH sent this time, that is, the frequency domain repetition times, when the UE has both uplink data and downlink data to be sent, Obtain the aggregation levels N _{UL_DCI} and N _{DL_DCI} of the uplink and downlink grants respectively; according to the policy of prioritizing the uplink grant, according to the N _{UL_DCI} , N _{DL_DCI} and the preset number of subbands pdcch_span occupied by the PDCCH, determine the PDCCH search for this transmission grant space length; when the UE only has uplink data, according to the CQI reported by the UE, obtain the PDCCH aggregation level N _{UL_DCI} of the uplink authorization sent this time, and use the obtained N _{UL_DCI} as the PDCCH search space length of the transmission authorization this time; when When the UE only has downlink data, according to the CQI reported by the UE, the PDCCH aggregation level N _{DL_DCI} of the downlink authorization sent this time is obtained, and the obtained N _{DL_DCI is} used as the PDCCH search space length of the transmission authorization this time.

Preferably, the initial startup configuration unit is used to determine that the length of the PDCCH search space authorized for this transmission is the sum of N _{UL_DCI} and N _{DL_DCI} if N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span; if N _{UL_DCI} +N _{DL_DCI} >pdcch_span , then it is determined that the length of the PDCCH search space authorized for this transmission is N _{UL_DCI} .

Preferably, the initial startup configuration unit is used for when the UE has both uplink data and downlink data to be sent, if N _{UL_DCI} +N _{DL_DCI} ≤pdcch_span, the startup DCI carries the length of the PDCCH search space, Within the length of the PDCCH search space, the grants indicating PDSCH/PUSCH data transmission are carried in the order of uplink grants and then downlink grants.

Preferably, the initial startup configuration unit is configured to allocate PDSCH resources to the UE by using the subband resources after the PDCCH search space currently determined for the UE when the UE has downlink services.

Preferably, the starting DCI includes: the starting subband number First_f of the PDCCH, the number of subbands occupied by the PDCCH pdcch_span, the period factor PDCCH-StartF, and the number of repetition frames PDCCH-NumRepetitions.

Preferably, the second judging unit is configured to judge that the PDCCH starting point of the UE needs to be changed if the channel quality of the UE changes and the change range exceeds a preset range, or the resources allocated for the UE are preempted. The first sub-band number.

Preferably, the resource configuration unit is changed to carry the starting position of the PDCCH by using the First_f field in the uplink and downlink authorized DCI, and use other fields in the uplink and downlink authorized DCI except the First_f field to carry the uplink and downlink. Scheduling information corresponding to the row resource;

Unchanged resource configuration unit, used to carry the starting position of the PDCCH by using the First_f field in the uplink and downlink authorized DCI, and use other fields in the uplink and downlink authorized DCI to carry the corresponding uplink and downlink resources except the First_f field scheduling information.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (16)

1. a kind of resource allocation method of control channel characterized by comprising

A, judge whether current be first to distribute resource to scheduling user's set UE, if it is, being transferred to step b, otherwise, is turned Enter step c；

B, determine that this sends the PDCCH search space length and corresponding PDCCH search space of authorization for the UE, according to institute Stating PDCCH search space is that the UE distributes PDSCH resource, and the PDCCH search space is passed through starting Downlink Control Information DCI is notified to UE；

C, according to the priority of the channel quality of present frame and the UE, judge whether the PDCCH starting for needing to change the UE Otherwise subband number, is transferred to step e if it is, being transferred to step d；

D, the uplink and downlink resource that next dispatching cycle is distributed for the UE, by the corresponding scheduling information of the uplink and downlink resource and The corresponding initial position PDCCH, is sent to the UE by same uplink and downlink authorization DCI, terminates the resource distribution of the UE；

E, the corresponding scheduling information of uplink and downlink resource by the last time for UE distribution and the corresponding initial position PDCCH, It is sent to the UE by same uplink and downlink authorization DCI, terminates the resource distribution of the UE.

2. the method according to claim 1, wherein being that the UE determines that this sends authorization in step b PDCCH search space length includes:

When the UE has upstream data and downlink data to need to send simultaneously, according to the CQI that the UE is reported, this hair is obtained The polymerization grade i.e. frequency domain number of repetition for sending PDCCH, respectively obtains the polymerization grade N of uplink and downlink authorization_{UL_DCI}And N_{DL_DCI}；According to The preferential strategy for placing uplink authorization, according to the N_{UL_DCI}、N_{DL_DCI}The sub-band number pdcch_ occupied with preset PDCCH Span determines that this sends the PDCCH search space length of authorization；

When the UE only has upstream data, according to the CQI that the UE is reported, it is poly- to obtain the PDCCH that this sends uplink authorization Close grade N_{UL_DCI}, by acquired N_{UL_DCI}The PDCCH search space length of authorization is sent as this；

When the UE only has downlink data, according to the CQI that the UE is reported, it is poly- to obtain the PDCCH that this sends downstream grants Close grade N_{DL_DCI}, by acquired N_{DL_DCI}The PDCCH search space length of authorization is sent as this.

3. according to the method described in claim 2, it is characterized in that, according to the N_{UL_DCI}、N_{DL_DCI}It is occupied with preset PDCCH Sub-band number pdcch_span, determine this send authorization PDCCH search space length include:

If N_{UL_DCI}+N_{DL_DCI}≤ pdcch_span, then this PDCCH search space length for sending authorization is N_{UL_DCI}With N_{DL_DCI}Sum；

If N_{UL_DCI}+N_{DL_DCI}> pdcch_span, then this PDCCH search space length for sending authorization is N_{UL_DCI}。

4. according to the method described in claim 2, it is characterized in that, when the UE has upstream data and downlink data needs simultaneously When transmission, if N_{UL_DCI}+N_{DL_DCI}≤ pdcch_span, then the starting DCI carries the PDCCH search space length, In Sequence in the PDCCH search space length according to downstream grants after first uplink authorization carries instruction PDSCH/PUSCH data The authorization of transmission.

5. the method according to claim 1, wherein it is described according to described search space be the UE distribute PDSCH resource includes:

When the UE has downlink business, using the sub-band resources after the PDCCH search space currently determined for the UE, it is The UE distributes PDSCH resource.

6. the method according to claim 1, wherein the starting DCI includes: the starting subband number of PDCCH Sub-band number pdcch_span, the periodicity factor PDCCH-StartF and repeat frame number PDCCH- that First_f, PDCCH are occupied NumRepetitions。

7. the method according to claim 1, wherein judging whether to need to change the UE's described in step c PDCCH originates subband number

If the channel quality of the UE changes and amplitude of variation is more than preset range, or the resource for UE distribution It is preempted, then determines the PDCCH starting subband number for needing to change the UE.

8. the method according to claim 1, wherein uplink and downlink authorization DCI described in step d utilizes First_f Domain carries the initial position PDCCH, carries the corresponding tune of uplink and downlink resource using other domains in addition to the domain First_f Spend information；

Uplink and downlink authorization DCI described in step e carries the initial position PDCCH using the domain First_f, using except described Other domains except the domain First_f carry the corresponding scheduling information of uplink and downlink resource.

9. a kind of device for allocating resources of control channel characterized by comprising

First judging unit, for judging whether current be first to distribute resource to scheduling user's set UE, if it is, touching It sends out resource configuration unit first and executes, otherwise, triggering second judgment unit executes；

Initial start-up configuration unit, for determining that this sends the PDCCH search space length of authorization and corresponding for the UE PDCCH search space is that the UE distributes PDSCH resource according to the PDCCH search space, by the PDCCH search space It notifies to trigger second judgment unit to UE and execute by starting Downlink Control Information DCI；

Second judgment unit, for judging whether to need to change institute according to the channel quality of present frame and the priority of the UE The PDCCH starting subband number of UE is stated, if it is, triggering change resource configuration unit executes, otherwise, triggering is not changed resource and matched Set unit execution；

Resource configuration unit is changed, for distributing the uplink and downlink resource of next dispatching cycle for the UE, by the uplink and downlink The corresponding scheduling information of resource and the corresponding initial position PDCCH are sent to the UE by same uplink and downlink authorization DCI；

Do not change resource configuration unit, for by it is the last be UE distribution the corresponding scheduling information of uplink and downlink resource and The corresponding initial position PDCCH, is sent to the UE by same uplink and downlink authorization DCI.

10. device according to claim 9, which is characterized in that the initial start-up configuration unit, it is same for working as the UE When thering is upstream data and downlink data to need to send, according to the CQI that the UE is reported, obtain this polymerization for sending PDCCH Grade, that is, frequency domain number of repetition respectively obtains the polymerization grade N of uplink and downlink authorization_{UL_DCI}And N_{DL_DCI}；Uplink is placed according to preferential The strategy of authorization, according to the N_{UL_DCI}、N_{DL_DCI}The sub-band number pdcch_span occupied with preset PDCCH, determines this hair Send the PDCCH search space length of authorization；When the UE only has upstream data, according to the CQI that the UE is reported, this is obtained Send the PDCCH polymerization grade N of uplink authorization_{UL_DCI}, by acquired N_{UL_DCI}The PDCCH search space of authorization is sent as this Length；When the UE only has downlink data, according to the CQI that the UE is reported, it is poly- to obtain the PDCCH that this sends downstream grants Close grade N_{DL_DCI}, by acquired N_{DL_DCI}The PDCCH search space length of authorization is sent as this.

11. device according to claim 10, which is characterized in that the initial start-up configuration unit, if being used for N_{UL_DCI} +N_{DL_DCI}≤ pdcch_span, it is determined that this PDCCH search space length for sending authorization is N_{UL_DCI}And N_{DL_DCI}Sum；Such as Fruit N_{UL_DCI}+N_{DL_DCI}> pdcch_span, it is determined that this PDCCH search space length for sending authorization is N_{UL_DCI}。

12. device according to claim 10, which is characterized in that the initial start-up configuration unit, for working as the UE When thering is upstream data and downlink data to need to send simultaneously, if N_{UL_DCI}+N_{DL_DCI}≤ pdcch_span, then the starting DCI Carry the PDCCH search space length, in the PDCCH search space length according to first uplink authorization after downstream grants Sequence carries the authorization of instruction PDSCH/PUSCH data transmission.

13. device according to claim 9, which is characterized in that the initial start-up configuration unit, for having as the UE When downlink business, using the sub-band resources after the PDCCH search space currently determined for the UE, distributed for the UE PDSCH resource.

14. device according to claim 9, which is characterized in that the starting DCI includes: the starting subband number of PDCCH Sub-band number pdcch_span, the periodicity factor PDCCH-StartF and repeat frame number PDCCH- that First_f, PDCCH are occupied NumRepetitions。

15. device according to claim 9, which is characterized in that second judgment unit, for working as the channel matter of UE described in fruit Amount change and amplitude of variation be more than preset range, or for the UE distribution resource be preempted when, judgement need to change The PDCCH of the UE originates subband number.

16. device according to claim 9, which is characterized in that change resource configuration unit, for utilizing the uplink and downlink The domain First_f in DCI is authorized to carry the initial position PDCCH, using removing the First_ in the uplink and downlink authorization DCI Other domains except the domain f carry the corresponding scheduling information of uplink and downlink resource；

Resource configuration unit is not changed, is risen for carrying the PDCCH using the domain First_f in the uplink and downlink authorization DCI It is corresponding to carry uplink and downlink resource using other domains in the uplink and downlink authorization DCI in addition to the domain First_f for beginning position Scheduling information.