CN102186201A

CN102186201A - User equipment (UE) and method for detecting physical downlink control channel (PDCCH)

Info

Publication number: CN102186201A
Application number: CN2011101272902A
Authority: CN
Inventors: 卜天
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2011-05-17
Filing date: 2011-05-17
Publication date: 2011-09-14
Anticipated expiration: 2031-05-17
Also published as: CN102186201B

Abstract

The invention discloses user equipment (UE) and a method for detecting a physical downlink control channel (PDCCH). The method comprises the following steps of: acquiring a channel quality indicator (CQI) value reported last time when the detection on the PDCCH is confirmed to be triggered; determining the quantity of control channel elements (CCE) mapped by the CQI value reported last time according to a mapping relation between the CQI value predetermined with a base station and the quantity of the CCEs which are on the PDCCH and used for data transmission; and detecting data transmitted on the PDDCH according to the determined quantity of the CCEs. By the method, the detection time of the PDCCH reaches a theoretical minimum value and the hardware complexity of the UE is reduced, so that the development cost of the UE is lowered, the error rate of detection on a physical downlink shared channel (PDSCH) by the UE is reduced, and the performance of a UE receiver is enhanced.

Description

The method of a kind of UE and detection PDCCH thereof

Technical field

The present invention relates to wireless communication technology field, relate in particular to the method for a kind of UE and detection PDCCH thereof.

Background technology

At LTE (Long Term Evolution, Long Term Evolution) in the system, PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) is used to transmit the scheduling control information of up-downgoing, decision PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel) and the control informations such as resource allocation, frequency hopping type and transmission mode of PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel).

In order better to make UE (User Equipment, subscriber equipment) PDCCH transmission adapts to the channel condition of UE, 4 kinds of PDCCH format are supported in the PDCCH transmission of UE, CCE (Control Channel Element, the control channel unit) length (being CCE quantity) of the use of 4 kinds of PDCCH format supports and the data b it number (being the bit number of physical layer actual transmissions) through after the processing such as CRC (Cyclic Redundancy Check cyclic redundancy check (CRC)), rate-matched that can carry are as shown in table 1.

The PDCCH form (by quoting among the agreement 3GPP 36.211) that table 1LTE supports

The transmitting power of PDCCH and the PDCCH form of use (promptly supporting the CCE length of use) are determined in the base station, and at the PDCCH transmitting data.

For user terminal UE, and do not know the concrete PDCCH form that adopts in base station.In order to receive the data that transmit the base station on PDCCH, UE adopts blind checking method to realize that PDCCH goes up the reception of data usually at present, idiographic flow as shown in Figure 1, when down trigger detects PDCCH, according to CCE length is that 1,2,4,8 order detects (perhaps opposite), till detecting corresponding PDCCH, and carry out PDSCH and go up data processing.

The Cycle of DSP is meant that this DSP carries out the least unit of calculation process, can be equal to the processing time of DSP.The Cycles number of a required by task is big more, and it is long more to illustrate that then DSP handles the time that this required by task wants, and shared resource is many more.For user terminal UE, suppose that detecting the required Cycles number of PDCCH on each CCE length is C, then from Fig. 1, can learn, correctly detect the required Cycles of PDCCH and count N ∈ { C, 2C, 3C, 4C}.Therefore, under extreme case, be that base station side is 1 (or 8) in the CCE length that the PDCCH transmitting data uses, and the UE side is that 8 (or 1) begin to detect from CCE length, then correctly count maximum N=4C to detecting the required Cycle of data that PDCCH transmitted, this has just increased the requirement to the UE disposal ability, thereby causes the UE cost to increase, and may cause that corresponding PDSCH receives mistake.

Summary of the invention

The invention provides the method for a kind of UE and detection PDCCH thereof, in order to the time of saving LTE-TDD terminal (being used for terminal UE) blind Detecting PDCCH, thus the hardware cost of reduction UE.

The invention provides a kind of user terminal UE and detect the PDCCH method, comprising:

When determining to trigger the PDCCH detection, obtain the channel quality indicator (CQI) value that the last time reports;

Go up the control channel unit CCE number mapping relations that transfer of data is used according to CQI value of making an appointment with the base station and PDCCH, determine the CCE number that CQI value that the last time reports is shone upon;

Detect the data of being transmitted on the PDCCH according to the CCE number of determining.

The present invention also provides the method for a kind of base station at the physical downlink control channel PDCCH transmitting data, comprising:

Determine when the PDCCH transmitting data, to obtain the CQI value that user terminal UE the last time reports;

Go up the control channel unit CCE number mapping relations that transfer of data is used according to CQI value of making an appointment with UE and PDCCH, determine the CCE number that CQI value that the last time reports is shone upon;

The resource of using described definite CCE number correspondence is at the PDCCH transmitting data.

The present invention also provides a kind of user terminal UE, comprising:

CQI value acquiring unit when being used for determining to trigger the PDCCH detection, obtains the channel quality indicator (CQI) value that the last time reports;

CCE number determining unit is used for the control channel unit CCE number mapping relations according to transfer of data use on the CQI value of making an appointment with the base station and the PDCCH, determines the CCE number that CQI value that the last time reports is shone upon;

Directly detecting unit is used for detecting the data of being transmitted on the PDCCH according to the CCE number of determining.

The present invention also provides a kind of base station, comprising:

CQI value receiving element is used to determine obtain the CQI value that user terminal UE the last time reports when the PDCCH transmitting data;

CCE uses determining unit, is used for the control channel unit CCE number mapping relations according to transfer of data use on the CQI value of making an appointment with UE and the PDCCH, determines the CCE number that CQI value that the last time reports is shone upon;

Data transmission unit, the resource that is used to use described definite CCE number correspondence is at the PDCCH transmitting data.

Utilize UE provided by the invention and detect the method for PDCCH, base station and in the method for PDCCH transmitting data has following beneficial effect: make PDCCH reach theoretical minimum value detection time; Reduce the hardware complexity of UE, thereby reduce the UE development cost; Reduce the error rate that UE detects PDSCH, promote the UE receiver performance.

Description of drawings

Fig. 1 is an existing P DCCH testing process;

Fig. 2 is the method flow diagram that UE detects PDCCH in the embodiment of the invention;

Fig. 3 is for adopting 1/2/4/8 to be the PDCCH testing process figure that example provides with the CCE number in the embodiment of the invention;

The DETECTION flow chart of Fig. 4 for when detecting the PDCCH failure, changing among Fig. 3;

The base station is at the method flow diagram of PDCCH transmitting data in Fig. 5 embodiment of the invention;

The user terminal UE structure chart of Fig. 6 for providing in the embodiment of the invention;

The architecture of base station figure of Fig. 7 for providing in the embodiment of the invention.

Embodiment

Below in conjunction with drawings and Examples to UE provided by the invention and detect the method for PDCCH, base station and illustrate in greater detail in the method for PDCCH transmitting data.

According to 3GPP 36.211 agreements, UE can use PUCCH (Physical Uplink Control Channel periodically, Physical Uplink Control Channel) channel is to the descending CQI of base station feedback (Channel Quality Indicator, the channel quality indication) value, this CQI value can be indicated the satisfaction of UE to current downlink channel quantitatively, the applicant discovers, when CQI when higher, the ability of UE reception downstream signal is more intense, under this kind situation, use less CCE number, for example the CCE number is 1, just can guarantee that UE correctly detects the data that PDCCH goes up transmission; When the CQI value was relatively lower, the ability of UE reception downstream signal was poor, needs to use bigger CCE number under this kind situation, and for example the CCE number is 8, could guarantee to make UE correctly to detect the data that PDCCH goes up transmission as far as possible.

Based on this, the embodiment of the invention provides a kind of user terminal UE to detect the physical downlink control channel PDCCH method, as shown in Figure 2, comprising:

Step S201 when determining to trigger the PDCCH detection, obtains the channel quality indicator (CQI) value that the last time reports;

UE can periodically report CQI, and UE only stores the CQI that the last time reports in the present embodiment, i.e. the CQI value that obtains with each latest computed covers the CQI value of last stored, and when triggering the PDCCH detection, read the position of directly going to store the CQI value.Trigger the machine-processed same prior art that PDCCH detects, detect etc., no longer describe in detail here as down trigger PDCCH.

Step S202 goes up the control channel unit CCE number mapping relations that transfer of data is used according to CQI value of making an appointment with the base station and PDCCH, determines the CCE number that CQI value that the last time reports is shone upon;

Step S203 detects the data of being transmitted on the PDCCH according to the CCE number of determining.

UE detects the data of being transmitted on the PDCCH according to the CCE number of determining, specifically can adopt current mechanism, promptly for different CCE numbers, corresponding resource original position difference, the base station can be with each the self-corresponding original position of all CCE numbers that can use, UE is at the CCE number of having determined that the base station is used, just can determine corresponding original position, and press the CCE number in the original position of correspondence and detect data, obtain the data that PDCCH goes up transmission, carry out PDSCH and go up data processing, detailed process no longer describes in detail here.

Rendezvous protocol between UE and the base station in the embodiment of the invention: the CCE number that different CQI values is corresponding different, the space that then UE just can use priori---CQI of periodic report---reduces the CCE search, reduce and detect the Cycle quantity that PDCCH needs, thereby reduce requirement, reach the target of reduction UE cost the UE disposal ability.

Preferably, when successfully not getting access to the CQI value that the last time reports, as UE the last time not correct calculation obtain the CQI value, the CQI value is changed to when invalid, UE obtains the CQI value failure that the last time reports.The embodiment of the invention is not when successfully getting access to the CQI value that the last time reports, handle by existing P DCCH testing process, i.e. all CCE numbers that can use for the base station, detect the data of being transmitted on the PDCCH according to corresponding C CE number successively according to the setting order, until successfully detecting data, as according to CCE number order from small to large, or detect according to CCE number order from big to small.

Generally, UE is consistent with the CQI value that the base station reported the last time, so UE can only carry out PDCCH and detect, and just can correctly detect PDCCH and go up the data of transmitting.But, under a few cases, report CQI value failure and adopt the base station is the CQI value that reports the last time as the bad UE of causing of network signal, then base station and UE CQI value that the last time is reported understands differently and causes, then UE carries out can failing when PDCCH detects, in the preferred embodiment of the present invention, during data that UE does not successfully detect on the PDCCH to be transmitted according to the CCE number of determining, further comprise:

Can use for the base station, the CCE number except that described definite CCE number, detect the data of being transmitted on the PDCCH according to corresponding C CE number successively according to the setting order, until successfully detecting data.

Therefore, the embodiment of the invention when not having CQI priori resource, then this moment UE to detect the required Cycles number of the required Cycles number of PDCCH and existing mode identical; The present invention can make UE detect the required Cycles number of PDCCH and reach theoretic minimum value when having CQI priori resource; In addition, if there is the flase drop to CQI in the base station, then this moment UE to detect the required Cycles number of the required Cycles number of PDCCH and existing mode identical.As seen when not having CQI priori value or CQI decoding error, it is identical with existing method that the present invention can guarantee that PDCCH detects performance.

On the whole, the embodiment of the invention makes PDCCH reach theoretical minimum value detection time; Reduce the hardware complexity of UE, thereby reduce the UE development cost; Reduce the error rate that UE detects PDSCH, promote the UE receiver performance.

The CQI value that UE can report has a plurality of, the CCE number that the base station can be used, and the sum of CQI value is greater than the CCE number, for how arranging the CCE number mapping relations that CQI value and PDCCH transmission data are used, preferably in the following way usually:

The bit number that the CQI value that reports according to UE takies is determined all CQI values that UE can report;

At least one CQI value that each CCE number that can use by definite base station is shone upon, set up mapping with all CQI values, can be understood as the CQI value is divided into groups by the number of different CCE numbers, each grouping comprises a CQI value at least, sets up the one-to-one relationship of each grouping and CCE number;

For any two CCE numbers that the base station can be used, each CQI value that the CCE number that value is bigger is shone upon, all each CQI value of being shone upon greater than the less CCE number of value.

Like this, can guarantee that UE can correctly receive the data that PDCCH goes up transmission.

Further, the number of base station each CCE number that can use CQI value of being shone upon equates.

CCE number with 3GPP 36.211 regulations can adopt 1,2,4 and 8 below, and taking 4bit with the CQI value is example, and certainly, other bit number that takies for CQI also is suitable for, have 16 kinds of CQI values of feedback when CQI takies 4bot, then it is divided into 4 grouping: Q1={12,13,14 according to the big young pathbreaker of value, 15}, Q2={8,9,10,11}, Q3={4,5,6,7}, Q4={0,1,2,3}, then when CQI value Q ∈ Q1, the CCE number of mapping is 1; When CQI value Q ∈ Q2, the CCE number of mapping is 2; When CQI value Q ∈ Q3, the CCE number of mapping is 4; When CQI value Q ∈ Q4, the CCE number of mapping is 8; If in the time of on the CCE length of being shone upon, can't normally detecting PDCCH, then travel through other all CCE length according to the CQI value.Concrete flow process when down trigger PDCCH detects, is inquired about the CQI value Q that reports recently as shown in Figure 3; When CQI value Q ∈ Q1, be 1 to carry out PDCCH and detect by CCE length (being the CCE number); When CQI value Q ∈ Q2, be 2 to carry out PDCCH and detect by CCE length; When CQI value Q ∈ Q3, be 4 to carry out PDCCH and detect by CCE length; When CQI value Q ∈ Q4, be 8 to carry out PDCCH and detect by CCE length.If what UE reported is no available CQI priori resource, then detect by existing P DCCH testing process.If correctly do not detect PDCCH, then change the DETECTION flow process over to.

As shown in Figure 4, for detecting the testing process that carries out after the failure in the embodiment of the invention, be specially the value of record i earlier, circulation detects then, when being recycled to the i value, no longer detects process ends.

The embodiment of the invention also provides the method for a kind of base station at the physical downlink control channel PDCCH transmitting data, as shown in Figure 5, comprising:

Step S501 determines to obtain the CQI value that user terminal UE the last time reports when the PDCCH transmitting data;

Step S502, go up the control channel unit CCE number mapping relations that transfer of data is used according to CQI value of making an appointment with UE and PDCCH, the mode that the CCE number that the CQI value that definite the last time reports is shone upon, concrete stipulated form can adopt the above embodiment of the present invention to describe;

Step S503, the resource of using described definite CCE number correspondence is at the PDCCH transmitting data.

Based on same inventive concept, a kind of user terminal UE and base station equipment also are provided in the embodiment of the invention, because the principle that these equipment are dealt with problems is similar in the method for PDCCH transmitting data to method, a kind of base station that a kind of UE detects PDCCH, therefore the enforcement of these equipment can repeat part and repeat no more referring to the enforcement of method.

The user terminal UE that the embodiment of the invention provides as shown in Figure 6, comprising: CQI value acquiring unit 601, when being used for determining to trigger the PDCCH detection, obtain the channel quality indicator (CQI) value that the last time reports; CCE number determining unit 602 is used for the control channel unit CCE number mapping relations according to transfer of data use on the CQI value of making an appointment with the base station and the PDCCH, determines the CCE number that CQI value that the last time reports is shone upon; Directly detecting unit 603 is used for detecting the data of being transmitted on the PDCCH according to the CCE number of determining.

Preferably, this UE also comprises: the cycle detection unit, all CCE numbers that are used for can using for the base station detect the data of being transmitted on the PDCCH according to corresponding C CE number according to the setting order, successively until successfully detecting data.

The CCE number mapping relations that the CQI value of the described agreement that CCE number determining unit 602 is used and PDCCH transmission data are used, specifically set up in the following way:

At least one CQI value that each CCE number that can use by definite base station is shone upon is set up the mapping with all CQI values;

Preferably, this UE also comprises: get rid of detecting unit, during the data that are used for successfully not detecting on the PDCCH to be transmitted according to the CCE number of determining, can use for the base station, the CCE number except that described definite CCE number, detect the data of being transmitted on the PDCCH according to corresponding C CE number successively according to the setting order, until successfully detecting data.

The embodiment of the invention also provides a kind of base station, as shown in Figure 7, comprising: CQI value receiving element 701 is used to determine obtain the CQI value that user terminal UE the last time reports when the PDCCH transmitting data; CCE uses determining unit 702, is used for the control channel unit CCE number mapping relations according to transfer of data use on the CQI value of making an appointment with UE and the PDCCH, determines the CCE number that CQI value that the last time reports is shone upon; Data transmission unit 703, the resource that is used to use described definite CCE number correspondence is at the PDCCH transmitting data.

Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.

The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.

These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a user terminal UE detects the physical downlink control channel PDCCH method, it is characterized in that, comprising:

2. the method for claim 1 is characterized in that, when successfully not getting access to the CQI value that the last time reports, further comprises:

All CCE numbers for the base station can be used detect the data of being transmitted on the PDCCH according to corresponding C CE number according to the setting order, successively until successfully detecting data.

3. the method for claim 1 is characterized in that, the CCE number mapping relations that the CQI value of described agreement and PDCCH transmission data are used are specifically set up in the following way:

4. method as claimed in claim 3 is characterized in that, the number of the CQI value that each CCE number that the base station can be used is shone upon equates.

5. the method for claim 1 is characterized in that, during the data that successfully do not detect on the PDCCH to be transmitted according to the CCE number of determining, further comprises:

6. a base station is characterized in that in the method for physical downlink control channel PDCCH transmitting data, comprising:

7. method as claimed in claim 6 is characterized in that, the CCE number mapping relations that the CQI value of described agreement and PDCCH transmission data are used are specifically set up in the following way:

8. a user terminal UE is characterized in that, comprising:

9. UE as claimed in claim 8 is characterized in that, also comprises:

The cycle detection unit, all CCE numbers that are used for can using for the base station detect the data of being transmitted on the PDCCH according to corresponding C CE number according to the setting order, successively until successfully detecting data.

10. UE as claimed in claim 8 is characterized in that, the CCE number mapping relations that the CQI value of the described agreement that described CCE number determining unit is used and PDCCH transmission data are used are specifically set up in the following way:

11. UE as claimed in claim 8 is characterized in that, also comprises:

Get rid of detecting unit, during the data that are used for successfully not detecting on the PDCCH to be transmitted according to the CCE number of determining, can use for the base station, the CCE number except that described definite CCE number, detect the data of being transmitted on the PDCCH according to corresponding C CE number successively according to the setting order, until successfully detecting data.

12. a base station is characterized in that, comprising: