CN101841892A

CN101841892A - Method, equipment and system for indicating and detecting PDCCH in a carrier aggregation system

Info

Publication number: CN101841892A
Application number: CN200910176042A
Authority: CN
Inventors: 雷蕾; 王军; 徐晓东; 胡南
Original assignee: China Mobile Communications Group Co Ltd
Current assignee: China Mobile Communications Group Co Ltd
Priority date: 2009-03-18
Filing date: 2009-09-22
Publication date: 2010-09-22
Anticipated expiration: 2029-09-22
Also published as: CN101841892B

Abstract

The invention discloses a method for detecting PDCCH in a carrier aggregation system. The method comprises the following steps that: a terminal detects the PDCCH which belongs to the terminal from one carrier in the carrier aggregation system, then determines position information of the detected PDCCH, and finally detects the PDCCH which belongs to the terminal from the carrier which corresponds to the position information. Due to the adoption of the method, the terminal does not need to blindly detect each carrier, so the number of blind detection is reduced. The invention also discloses a method and equipment for indicating the physical downlink control channel (PDCCH) in the carrier aggregation system, and the equipment and the system for detecting the PDCCH.

Description

PDCCH indication, detection method, equipment and system in the carrier aggregation system

Technical field

The present invention relates to the communications field, relate in particular to indication, detection method, equipment and the system of the Physical Downlink Control Channel in a kind of carrier system.

Background technology

Along with the development of communication system, more and more higher to the requirement of the quantity of transfer of data and speed, therefore, (Long term evaluation has proposed the evolution version LTE-A system of LTE on basis LTE) in the Long Term Evolution standard.The LTE-A system will support that (bandwidth of the carrier wave of LTE system is 20MHz to the bandwidth bigger than LTE system, the bandwidth of LTE-A system can reach 100MHz), in order to satisfy of the requirement of LTE-A system to bandwidth, can be together with a plurality of LTE carrier aggregation, become carrier aggregation system, to satisfy the requirement of LTE-A to bandwidth.

(Physical Downlink Control Channel, PDCCH) data carried by data is resource allocation information and other control information of channel to Physical Downlink Control Channel.In the LTE system, one PDCCH can (Control Channel Element CCE) goes up transmission, and wherein (Resource Element RE) forms CCE by several Resource Units again at 1,2,4 or 8 successive control Channel Elements.RE is the time frequency unit of LTE system minimum, comprises a subcarrier on the frequency domain and an OFDM symbol on the time domain.A plurality of continuous CCE quantity are called the polymerization grade, for example, 4 continuous CCE, the polymerization grade that is referred to as CCE is 4.

For make terminal can be correctly, receiving resource allocation information and other control information fast, the position of PDCCH and the number that PDCCH takies CCE need be indicated to terminal in the base station.But in order to save channel overhead, do not indicate above-mentioned information in the LTE system, but adopt the method for blind Detecting to search out the PDCCH that belongs to this terminal by terminal to terminal.The mode that terminal is carried out blind Detecting is: terminal is at first with self sign, the subframe numbering of using, the CCE number that the control area comprises in the polymerization grade of the CCE that need occupy and this subframe is as input, obtain the original position of this terminal by specific hash algorithm in the search volume of every kind of polymerization grade of this subframe correspondence, comprise a series of PDCCH candidate collection in the described search volume, the candidate PDCCH number difference that the search volume comprised of different polymerization grade correspondences, terminal will detect each candidate PDCCH in each search volume, up to the PDCCH that obtains belonging to this terminal.

Because carrier aggregation system is that a plurality of LTE carrier aggregation form together, therefore, the PDCCH in the carrier aggregation system can be designed as structure shown in Figure 1.In the structural representation of Fig. 1, terminal all has independently PDCCH at each carrier wave, and the interior PDCCH of carrier wave is used for the information such as resource allocation conditions of indicating terminal in this carrier wave.Be used to indicate the PDCCH of resource allocation conditions in a certain carrier wave on this carrier wave, to transmit.

The structure of PDCCH shown in Figure 1 is changed very little to the norm structure of LTE, has better compatibility backward, but, when terminal is carried out blind Detecting in carrier aggregation system, the number of times of its blind Detecting will be along with the increase of number of carriers in the carrier aggregation system linear growth.If in the LTE standard, terminal needs about 40 blind Detecting just can obtain belonging to the PDCCH of this terminal in a subframe at most, in the carrier aggregation system of forming by N carrier wave, then need N * 40 time blind Detecting just can obtain belonging to all PDCCH of this terminal at most, because the number of times of blind Detecting is more, increased the detection cost and the power consumption of terminal.

Summary of the invention

The embodiment of the invention provide a kind of in the polymerization carrier system indication, detection method, equipment and the system of PDCCH, make terminal when detection belongs to the PDCCH of self, reduce the number of times of blind Detecting.

The indicating means of physical downlink control channel PDCCH in a kind of carrier aggregation system said method comprising the steps of:

The PDCCH of a certain terminal is determined to belong in the base station, and determines to have the positional information of the carrier wave of described PDCCH, wherein, and the corresponding carrier wave of each PDCCH, and the carrier wave difference of any two PDCCH correspondences;

The base station places the PDCCH that belongs to described terminal with the positional information of determining, and the carrier wave of the positional information correspondence of placing among the PDCCH is different with the carrier wave at this PDCCH place, is used to indicate described terminal to determine to have the carrier wave of described PDCCH according to described positional information.

A kind of method that detects PDCCH said method comprising the steps of:

Detect the PDCCH that belongs to this terminal in the carrier wave of terminal from carrier aggregation system;

Terminal is determined the positional information of placing in detected described PDCCH;

Terminal detects the PDCCH that belongs to this terminal from the carrier wave of described positional information correspondence.

The indicating equipment of PDCCH in a kind of carrier aggregation system, described equipment comprises:

The positional information determination module is used to determine to belong to the PDCCH of a certain terminal, and determines to have the positional information of the carrier wave of described PDCCH, wherein, and the corresponding carrier wave of each PDCCH, and the carrier wave difference of any two PDCCH correspondences;

Placement module, the positional information that is used for determining places the PDCCH that belongs to described terminal, and the carrier wave of the positional information correspondence of placing among the PDCCH is different with the carrier wave at this PDCCH place, indicates described terminal to determine to have the carrier wave of described PDCCH according to described positional information.

A kind of equipment that detects PDCCH comprises first detection module, carrier identification detection module and second detection module, wherein:

First detection module is used for detecting the PDCCH that belongs to a certain terminal from a carrier wave of carrier aggregation system;

The positional information detection module is used for the positional information of determining that nearest detected PDCCH places;

Second detection module is used for detecting the PDCCH that belongs to described terminal from the carrier wave of described positional information correspondence.

A kind of communication system, described system comprises:

The base station, be used to determine to belong to the PDCCH of terminal, and determine to have the positional information of the carrier wave of described PDCCH, and the positional information of determining placed the PDCCH that belongs to described terminal, wherein, the carrier wave of the positional information correspondence of placing among the PDCCH is different with the carrier wave at this PDCCH place, and, the corresponding carrier wave of each PDCCH, and the carrier wave difference of any two PDCCH correspondences;

Terminal is used for detecting the PDCCH that belongs to this terminal from a carrier wave of carrier aggregation system, and, determine the positional information of in detected described PDCCH, placing, and from the carrier wave of described positional information correspondence, detect the PDCCH that belongs to this terminal.

The present invention is by placing the positional information of other PDCCH place carrier waves that belong to same terminal in PDCCH, after making that terminal belongs to the PDCCH of this terminal in detecting a carrier wave, can determine that directly other have the carrier wave of the PDCCH that belongs to this terminal according to the positional information of placing among the PDCCH, therefore, terminal can be carried out blind Detecting to each carrier wave, has reduced the number of times of blind Detecting.

Description of drawings

Fig. 1 is the structural representation of the PDCCH of carrier aggregation system in the prior art;

Fig. 2 is to the indicating means flow chart of steps of the PDCCH in the carrier aggregation system in the embodiment of the invention one;

Fig. 3 is an improved PDCCH structural representation in the embodiment of the invention one;

Fig. 4 is an improved PDCCH structural representation in the embodiment of the invention one;

Fig. 5 places PDCCH structural representation after the side-play amount in PDCCH in the embodiment of the invention one;

Fig. 6 is an improved PDCCH structural representation in the embodiment of the invention one;

Fig. 7 places PDCCH structural representation after the side-play amount in PDCCH in the embodiment of the invention one;

Fig. 8 is the method step flow chart that detects PDCCH in the embodiment of the invention two;

Fig. 9 is the indicating equipment structural representation of PDCCH in the carrier aggregation system in the embodiment of the invention three;

Figure 10 is the device structure schematic diagram that detects PDCCH in the embodiment of the invention four;

Figure 11 is a communication system architecture schematic diagram in the embodiment of the invention five.

Embodiment

In the polymerization carrier system, may have the PDCCH that belongs to a certain terminal in each carrier wave, also may not have the PDCCH that belongs to this terminal,, will carry out blind Detecting each carrier wave if terminal will detect the whole PDCCH that belong to self in the polymerization carrier system.In order to reduce the number of times of terminal blind Detecting in carrier aggregation system as much as possible, the present invention transforms the structure of PDCCH in base station side, place the positional information of other PDCCH place carrier waves that belong to same terminal in some specific fields in belonging to the PDCCH of a certain terminal, after making that terminal belongs to the PDCCH of this terminal in detecting a carrier wave, can be according to further definite other carrier waves that may have the PDCCH of this terminal of the positional information of placing among the PDCCH, therefore, terminal can be directly detects the PDCCH that belongs to self to inquire to the carrier wave of described positional information correspondence, and do not need the whole carrier waves in the polymerization carrier system are carried out blind Detecting, compared with prior art, utilize the scheme of the embodiment of the invention when detecting the whole PDCCH that belongs to a terminal, to reduce number of times to the carrier wave blind Detecting.

In the scheme of various embodiments of the present invention, setting the positional information be used to search carrier wave is the carrier identification of carrier wave.

Describe the present invention below in conjunction with Figure of description.

As shown in Figure 2, in the embodiment of the invention one to the indicating means of the PDCCH in the carrier aggregation system, this indicating means mainly may further comprise the steps:

Step 101: the PDCCH of a certain terminal is determined to belong in the base station.

In the embodiment of the invention one, when the base station need communicate with terminal, the base station was carried at some control informations in the communication process among the PDCCH.

Step 102: the corresponding relation of the PDCCH that carrier wave in the carrier aggregation system and this carrier wave have is determined in the base station, wherein, and the corresponding carrier wave of each PDCCH, and the carrier wave difference of any two PDCCH correspondences.

Step 103: the carrier identification of the carrier wave of described PDCCH is determined to have in the base station.

Step 104: the base station places PDCCH with the carrier identification of determining, and the carrier wave of the positional information correspondence of placing among the PDCCH is different with the carrier wave at this PDCCH place.

In the embodiment of the invention one, the base station is placed carrier identification and is included but not limited to following dual mode:

First kind of mode: each carrier identification is placed a PDCCH respectively, that is to say, place a carrier identification among the PDCCH with other PDCCH carrier waves.

The second way: a carrier wave that will have PDCCH is as main carrier, and with in the carrier identification of determining, other carrier identification except that the carrier identification of main carrier correspondence place the PDCCH of main carrier.

The base station can notify which kind of mode of the current employing of terminal to place carrier identification by indication information.

In the present embodiment, the carrier identification of placing among the PDCCH is used for indicating terminal according to the definite carrier wave that may have the PDCCH that belongs to this terminal of described carrier identification, and terminal can utilize the carrier identification of placing in the detected carrier wave to detect the carrier wave that may have the PDCCH place that belongs to this terminal.

If the base station adopts above-mentioned first kind of mode to place carrier identification, after then terminal detects a PDCCH, according to a carrier identification that wherein comprises, determine corresponding carrier wave, and then from the carrier wave of determining, detect the PDCCH that belongs to this terminal, by that analogy, until detecting the PDCCH that all belong to this terminal.

If the base station adopts the above-mentioned second way to place carrier identification, then terminal obtains other a plurality of carrier identification with PDCCH carrier wave from the PDCCH of main carrier, determine the carrier wave of each carrier identification correspondence then respectively, and then determine the whole PDCCH that belong to this terminal.

When if the number of the PDCCH that determines is at least 3, when adopting above-mentioned first kind of mode to place carrier identification, place mutually in the carrier identification of any two carrier wave correspondences under the situation of the PDCCH that the other side has, for example, PDCCH in the first carrier places second carrier identification, PDCCH in second carrier wave places under the situation of first carrier sign, after then terminal detects PDCCH in the first carrier, can detect PDCCH in second carrier wave according to wherein second carrier identification, but what the PDCCH in second carrier wave placed is the first carrier sign that had detected, then can not continue to utilize carrier identification to detect again, should be when determining also to have nd PDCCH, detect the PDCCH that belongs to terminal by blind Detecting, and then carry out subsequent operation according to the carrier identification among this PDCCH.

After the scheme of utilizing embodiment one is improved the structure of PDCCH, terminal can be determined the carrier wave at nd PDCCH place easily, in order further to reduce terminal detects PDCCH in the carrier wave of determining number of times, between the step 104 of step 103 back, can also comprise:

Step 103A: the base station is determined the side-play amount of each described PDCCH in the searching carrier space respectively.

After step 104, further comprising the steps of:

Step 105: the PDCCH that the side-play amount of PDCCH in carrier wave of determining is placed the carrier identification of depositing this carrier wave correspondence.

The field of placing carrier identification in PDCCH can not limit, for example, can utilize through-put power control (the Transmission Power Control among the PDCCH, TPC) resource allocation field among field or the PDCCH is placed carrier identification, new field that also can be in PDCCH can also the DCI Format field in PDCCH be placed carrier identification in order to place carrier identification.

For example, when utilizing the TPC field to place carrier identification, because the TPC field can comprise 2 bit informations, therefore, the carrier identification that this TPC field can be indicated is 0～4, that is to say when utilizing the TPC field to place carrier identification to support the polymerization carrier system that 5 carrier waves are formed.When the maximum bandwidth of LTE-A system support is that the maximum bandwidth of 100MHz, the support of LTE system is when being 20MHz, the maximum bandwidth of LTE-A system can satisfy by the LTE carrier wave of 5 20MHz of polymerization, therefore, utilize the TPC field can satisfy the requirement of placing carrier identification.

Again for example by the granularity of resource allocation is strengthened, make that the required bit number of the resource allocation field among the PDCCH reduces on each carrier wave, and the bit of vacating can be used for placing carrier identification.

If adopt DCI Format field to place carrier identification, then can place bit (bitmap) in DCI Format field, be used to be illustrated on which carrier wave and have PDCCH.If 5 carrier waves are arranged in the carrier aggregation system, then bitmap comprises 5 bits.Under the mode that adopts above-mentioned first kind of placement carrier identification, if represent to have PDCCH on the 2nd carrier wave, then bitmap is＜01000 〉, adopt under the mode of above-mentioned second kind of placement carrier identification, if represent to have PDCCH on the 2nd carrier wave and the 5th carrier wave, then bitmap is＜01001 〉.

The embodiment of the invention is not limited to the field of placing side-play amount among the PDCCH yet, if the DCI form that belongs to the PDCCH of described terminal is 1,1A, 1B, 1C, 1D, 2 or 2A, place side-play amount in automatic retransmission request process sign (HARQ process id) field of mixing that then can be in PDCCH or the new field among the PDCCH; If belonging to the DCI form of the PDCCH of described terminal is 0, place side-play amount in cyclic shift (cyclic shift for demodulation referencesignal, the Cyclic shift for DM RS) field of demodulated reference signal that then can be in PDCCH or the new field among the PDCCH.

For example, when utilizing HARQ process id field to place side-play amount, HARQ process id field comprises 3 bit informations, and the value that can indicate is 0～8.According to the LTE standard, CCE polymerization grade is 1 or 2 o'clock, and its search volume comprises 6 candidates' PDCCH, when CCE polymerization grade is 4 or 8, its search volume comprises 2 candidate PDCCH, therefore, utilizes HARQ process id field can satisfy the requirement of placing side-play amount.

Again for example by the granularity of resource allocation is strengthened, make that the required bit number of the resource allocation field among the PDCCH reduces on each carrier wave, and the bit of vacating can be used for placing side-play amount.If the bit number of vacating is more, can satisfy the requirement of placing carrier identification and side-play amount simultaneously, the bit that also can utilize the increase granularity to vacate is placed carrier identification and side-play amount simultaneously.

In the method for embodiment one, if above-mentioned first kind of mode of placing carrier identification adopted in the base station, then the base station need pre-determine last PDCCH that belongs to this terminal, and the purpose of doing like this is to make terminal when detecting last PDCCH, stops the cycle detection operation.

Particularly, when carrier identification is the label of this carrier wave in the polymerization carrier system, the base station can will have the carrier wave of PDCCH according to the ascending sequence arrangement of carrier wave label, with the PDCCH in the carrier wave of carrier wave label maximum as last PDCCH, similarly, the base station also can be with the PDCCH in the carrier wave of carrier wave label minimum as last PDCCH.

Place carrier identification and side-play amount if utilize the existing field among the PDCCH, place carrier identification such as utilizing the TPC field, utilize HARQ process id field to place side-play amount, not the value of the real meaning of this field then owing to what place in TPC field in non-last PDCCH and the HARQ process id field, therefore, in the end must place value in TPC field among PDCCH and the HARQ process id field, make terminal come the detected PDCCH of correct interpretation according to detected last PDCCH with field real meaning.

If the bit or the new field that utilize the granularity increase to vacate are placed carrier identification and side-play amount, place carrier identification and side-play amount such as the bit that utilization is vacated, in the bit of can be in the end vacating among PDCCH special value or symbol are set, are used to refer to it and are last PDCCH.For example, can be set to complete 0, spcial character or the carrier identification of the carrier wave that detected.

Illustrate below and adopting above-mentioned first kind to place carrier identification and second kind and place under the situation of carrier identification respectively, utilize the PDCCH behind the retrofit scheme among the embodiment one and the structure of carrier wave.

As shown in Figure 3, be to adopt above-mentioned first kind when placing carrier identification, the bit that utilization is vacated is placed the situation of carrier identification, the polymerization carrier system is made up of 5 carrier waves (carrier wave 0～carrier wave 4), has the PDCCH that belongs to same terminal in carrier wave 0, carrier wave 1, carrier wave 2 and the carrier wave 3, be respectively PDCCH_0, PDCCH_1, PDCCH_2 and PDCCH_3, wherein, have PDCCH_3 in the carrier wave 3 of carrier wave label maximum in the carrier wave of PDCCH as last PDCCH in the polymerization carrier system.Utilize when placing carrier identification in above-mentioned first the sign that can in PDCCH_0, place carrier wave 1, the sign of in PDCCH_1, placing carrier wave 0, the sign of in PDCCH_2, placing carrier wave 3, the sign of in PDCCH_3, placing carrier wave 2.Like this, terminal has been by after blind Detecting has obtained PDCCH_0 in carrier wave 0, can directly utilize the sign of the carrier wave of placing among the PDCCH_0 1 to determine the carrier wave that may have the PDCCH that belongs to this terminal and be carrier wave 1, and detect in carrier wave 1.After detecting PDCCH_1, because what place among the PDCCH_1 is the sign of carrier wave 0, and carrier wave 0 is the carrier wave that had detected, and therefore, should stop to utilize a PDCCH to detect the process of next PDCCH, when determining also to have nd PDCCH, never the carrier-current relaying that detected is continuous carries out blind Detecting, just carries out blind Detecting in carrier wave 2, after detecting PDCCH_2, utilize the sign of the carrier wave of placing among the PDCCH_2 3, detect PDCCH_3.Further,, therefore, stop to utilize a PDCCH to detect the process of next PDCCH, when determining not have nd PDCCH, stop to detect because what place among the PDCCH_3 is the sign of the carrier wave 2 that detected.

Distinguishingly, in the organigram of PDCCH shown in Figure 3, judge that whether certain PDCCH is that the condition of last PDCCH can not be to represent last PDCCH with the carrier identification of the carrier wave that had detected.

If Fig. 3 utilizes the TPC field to place the situation of carrier identification, then in the TPC of PDCCH_3 field, place value with this TPC field real meaning.

Further, consider that number as the PDCCH that belongs to same terminal is that 3 or 3 are when above, under the situation as shown in Figure 3, the sign of carrier wave 0 is placed among the PDCCH_1, and the sign of carrier wave 1 is placed among the PDCCH_0, after then PDCCH_0 is measured in blind check, can detect PDCCH_1 easily, but can't detect the PDCCH that other did not also detect by PDCCH_1.In order to reduce the blind Detecting number of times to the full extent, can be on the basis of embodiment one, further be limited to above-mentioned first kind of mode of placing carrier identification: when the number of the PDCCH that determines is at least 3, the PDCCH that the carrier identification of any two carrier wave correspondences can not place the other side to have, that is to say, if have the described PDCCH that the first carrier corresponding identification of described PDCCH places second carrier wave to have, the then described second carrier wave corresponding identification places the PDCCH of other carrier waves of carrier wave except that first carrier with described PDCCH.

Under the mode of the above-mentioned first kind of placement carrier identification that further limits, the PDCCH shown in Figure 3 and the structure of carrier wave will be changed into situation shown in Figure 4 (remain and utilize the bit of vacating to place the situation of carrier identification), terminal is after PDCCH_0 is measured in blind check, can utilize being identified in the carrier wave 1 of carrier wave 1 of placement to detect PDCCH_1, carry out successively, behind the PDCCH_3 in detecting carrier wave 3, carrier identification (sign 0 of carrier wave 0) according to the carrier wave of placing among the PDCCH_3 that had detected, determine that PDCCH_3 is last PDCCH, then stop testing process, like this, terminal needn't detect PDCCH in carrier wave 4, reduced the detection number of times.

Fig. 5 (the bit placement carrier identification that utilization is vacated and the situation of side-play amount) is on the basis of Fig. 4, structural representation in PDCCH after the placement side-play amount, what place among the PDCCH_0 is the carrier identification of carrier wave 1, therefore, also places the side-play amount of PDCCH_1 in carrier wave 1 in PDCCH0.

As shown in Figure 6, be to adopt above-mentioned second kind when placing carrier identification, the bit that utilization is vacated is placed the situation of carrier identification, the polymerization carrier system is made up of 5 carrier waves (carrier wave 0～carrier wave 4), having the PDCCH that belongs to same terminal in carrier wave 0, carrier wave 1, carrier wave 2 and the carrier wave 3, is respectively PDCCH_0, PDCCH_1, PDCCH_2 and PDCCH_3.Utilize above-mentioned second kind when placing the carrier identification mode, can in PDCCH_0, place the sign of carrier wave 1,2 and 3.Like this, terminal is by after blind Detecting has obtained PDCCH_0 in carrier wave 0, can directly utilize the carrier wave 1,2 placed among the PDCCH_0 and 3 sign to determine carrier wave 1, carrier wave 2 and the carrier wave 3 that may have the PDCCH that belongs to this terminal, by detection, determine to belong to PDCCH_1, PDCCH_2 and the PDCCH_3 of this terminal to carrier wave 1, carrier wave 2 and carrier wave 3.

Fig. 7 is on the basis of Fig. 6, structural representation in PDCCH after the placement side-play amount, what place among the PDCCH_0 is the carrier identification of carrier wave 1, carrier wave 2 and carrier wave 3, therefore, also in PDCCH0, place PDCCH_1, PDCCH_2 and the PDCCH_3 side-play amount in carrier wave 1, carrier wave 2 and carrier wave 3 respectively.

After utilizing the indicating mode of embodiment one that the structure of PDCCH is transformed, terminal can detect the PDCCH in the polymerization carrier system of improved PDCCH composition, the process of detection PDCCH may further comprise the steps as shown in Figure 8 in the embodiment of the invention two:

Step 201: detect the PDCCH that belongs to self in the carrier wave of terminal from carrier aggregation system.

Step 202: terminal determines also to exist in the described carrier aggregation system the nd PDCCH that belongs to self.

If also there is the nd PDCCH that belongs to this terminal in the system, that is to say that the detected PDCCH that belongs to this terminal is not last PDCCH that belongs to this terminal in the carrier aggregation system recently.

If when determining not exist in the carrier aggregation system the nd PDCCH that belongs to described terminal in this step, promptly the detected PDCCH that belongs to this terminal is last PDCCH that belongs to this terminal in the carrier aggregation system recently, then utilize TPC territory among last PDCCH and this PDCCH of real meaning interpretation in the HARQprocess id territory, testing process finishes.

Step 203: terminal is determined the carrier identification of placing among the detected PDCCH.

Belong to the sign of the PDCCH place carrier wave of same terminal owing to placed other in the field among the PDCCH in embodiment one, therefore, the carrier wave of detected carrier identification correspondence has the PDCCH that belongs to this terminal probably in step 203.

If handle according to first kind of mode of placing carrier identification among the embodiment one base station, then in this step, terminal determines that the carrier identification of placing among the detected PDCCH is the carrier identification of a carrier wave; If handle according to second kind of mode of placing carrier identification among the embodiment one base station, then in this step, terminal determines that the carrier identification of placing among the detected PDCCH is the carrier identification of a plurality of carrier waves.

Step 204: terminal detects the PDCCH that belongs to this terminal from the carrier wave of definite carrier identification correspondence.

Further, also placed the side-play amount of other PDCCH in the PDCCH that embodiment one relates to, therefore, between step 203 and step 204, described method also comprises:

Step 203A: terminal is determined the side-play amount of placing among the detected described PDCCH in step 203.

Then step 204 further comprises: terminal determines to have the carrier wave of the PDCCH that belongs to this terminal according to the described carrier identification of placing in detected described PDCCH, according to the described side-play amount of determining in detected described PDCCH, to place, detect the PDCCH that belongs to this terminal in the search volume from the carrier wave of determining then.

Carry out a step 201 to the scheme of step 204, if terminal correctly detects the PDCCH that belongs to self, then can jump to step 202, when in determining carrier aggregation system, also having the nd PDCCH that belongs to this terminal, utilize the carrier identification among the PDCCH that step 204 obtains to continue to detect other PDCCH, until detecting last PDCCH.

Distinguishingly, if the carrier wave of the carrier identification correspondence in the detected PDCCH of step 204 is the carrier wave that had detected, the perhaps detected PDCCH of step 204 illegal (PDCCH that does not promptly belong to this terminal), be that terminal does not successfully detect the PDCCH that belongs to self in step 204, then after the step 204, can also may further comprise the steps:

Step 205: terminal is carried out blind Detecting in the carrier wave that all the other did not detect, after successfully detecting the PDCCH that belongs to this terminal, jump to step 202, otherwise, execution in step 206.

Step 206: testing process finishes.

In the scheme of embodiment two, if handle according to first kind of mode of placing carrier identification among the embodiment one base station, then terminal needs constantly to jump to step 202 from step 205, and testing process could finish when detecting whole PDCCH.If handle according to second kind of mode of placing carrier identification among the embodiment one base station, then terminal is determined in step 204 except that after before the main carrier other have the carrier wave of PDCCH, from the carrier wave of determining, detect the PDCCH of this terminal, jump to step 206 then.

Different according to the field of placing carrier identification and side-play amount among the PDCCH, carrying into execution a plan of step 206 is also different.

Be existing field if place the field of carrier identification and side-play amount among the PDCCH, for example the TPC field is placed carrier identification, HARQ process id field is placed side-play amount, after then must successfully detecting last PDCCH, terminal could be explained detected PDCCH according to the real meaning in TPC field among last PDCCH and the HARQ process id field, if successfully do not detect last PDCCH, do not comprise the corresponding information in TPC field and the HARQ process id field among the detected PDCCH, that is to say that the information among the detected PDCCH is imperfect, therefore in step 206, abandon detected PDCCH.

If the bit or the new field that utilize the granularity increase to vacate are placed carrier identification and side-play amount, place carrier identification and side-play amount such as the bit that utilization is vacated, terminal is even without successfully detecting last PDCCH, but detected PDCCH has comprised complete information, therefore, terminal can not abandon detected PDCCH.

Respectively each step of embodiment two is described in detail below.

The specific implementation of step 201 is:

Terminal is selected a carrier wave from the polymerization carrier system, the mode by blind Detecting detects whether there is the PDCCH that belongs to this terminal in choosing carrier wave then;

If have the PDCCH that belongs to this terminal, then carry out subsequent step;

Otherwise, from the polymerization carrier system, reselect a carrier wave in other carrier waves of non-selected mistake and detect,, then carry out subsequent step if there is the PDCCH that belongs to this terminal in other the carrier wave, if there is not the PDCCH that belongs to this terminal in other the carrier wave, testing process finishes.

In blind detection process, if the base station with the PDCCH in the carrier wave of carrier wave label maximum as last PDCCH, then terminal will be carried out blind Detecting according to the ascending order of carrier wave label in the carrier wave that did not detect; Similarly, if the base station with the PDCCH in the carrier wave of carrier wave label minimum as last PDCCH, then terminal will be carried out blind Detecting according to the descending order of carrier wave label in the carrier wave that did not detect.For example in structural representation shown in Figure 5, terminal is at first carried out blind Detecting in carrier wave 0, if do not detect the PDCCH that belongs to this terminal, then carries out blind Detecting in carrier wave 1.

Further, except selecting in a certain order the carrier wave, terminal also can be selected a carrier wave at random from the polymerization carrier system, or selects a carrier wave in the carrier aggregation system in the indication information that issues according to the base station.If in some subframes, there be N the PDCCH (1≤N≤carrier number) that belongs to a certain terminal on a corresponding N carrier wave, to transmit, then must comprise main carrier in this N carrier wave, the sign of this main carrier will be issued terminal by indication information, and indicating terminal at first detects PDCCH in main carrier.If in main carrier, do not detect the PDCCH that belongs to this terminal, think directly then not have the PDCCH that belongs to this terminal in this polymerization carrier system that testing process finishes.

Different terminals has different main carriers, and the main carrier of a terminal can semi-staticly change.The condition that main carrier is set can comprise: when making each carrier wave as the main carrier of terminal, corresponding terminal number is identical or close as far as possible, and for example, carrier wave 0 is during as the main carrier of 5 terminals, the base station as far as possible with carrier wave 1 also as the main carrier of 5 terminals.

If the carrier wave label is selected in the base station from the carrier wave with PDCCH be not that carrier wave that maximum neither be minimum is as main carrier, and terminal does not successfully utilize the carrier identification and the side-play amount of placing among the PDCCH in the main carrier to detect next PDCCH in step 204, when then in step 205, carrying out blind Detecting, terminal still according to carrier identification from small to large or order from big to small carrier wave is carried out blind Detecting.Be example still with structure shown in Figure 5, suppose that carrier wave 1 is main carrier, when terminal does not successfully utilize PDCCH_1 to detect other PDCCH, terminal will begin to carry out blind Detecting from carrier wave 0, if when terminal does not successfully utilize PDCCH_0 to detect other PDCCH yet, terminal will be proceeded blind Detecting at carrier wave 2.

In the step 202, need utilize the sign mask of PDCCH to judge whether also there is the nd PDCCH that belongs to this terminal in the carrier aggregation system, the corresponding relation of the sign mask of PDCCH and the state of this PDCCH is as shown in table 1.

Whether be last PDCCH	The sign mask
Whether be last PDCCH	The sign mask	Not	????<0，0，0，0，0，0，0，0，0，0，0，0，0，0，0，0>
Be	????<0，0，0，0，0，0，0，0，0，0，0，0，0，0，0，1>	Not	????<0，0，0，0，0，0，0，0，0，0，0，0，0，0，0，0>

Table 1

Utilize the information of table 1 to judge whether also exist the nd method that belongs to the PDCCH of this terminal to comprise in the carrier aggregation system:

The first step: with cyclic redundancy check (CRC) (Cyclic Redundancy Check, 16 bit check positions CRC), 16 bit-identifies of terminal and nearest detected PDCCH first the sign mask carry out xor operation, described first the sign mask be＜0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 〉, represents that this PDCCH is not last PDCCH that belongs to this terminal in the described carrier aggregation system.

Judge whether also to exist the nd process that belongs to the PDCCH of described terminal in the step 202 if this step is meant, then nearest detected PDCCH is detected PDCCH in the step 201.

Second step: the data that obtain behind the xor operation are carried out CRC check,, then determine also to have the nd PDCCH that belongs to described terminal in the described carrier aggregation system if verification is passed through; Otherwise carried out for the 3rd step.

The 3rd step: the 16 bit check positions of CRC, 16 bit-identifies of terminal and the second sign mask of nearest detected PDCCH are carried out xor operation, and the described second sign mask is＜0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 〉, represents that this PDCCH is last PDCCH that belongs to this terminal in the described carrier aggregation system.

The 4th step: the data that obtain behind the xor operation are carried out CRC check, when verification is passed through, determine not exist in the described carrier aggregation system the nd PDCCH that belongs to described terminal.

If CRC check is not passed through yet in the 4th step, think that then nearest detected PDCCH is for illegal.

Above-mentionedly judge that whether also existing the nd method that belongs to the PDCCH of this terminal to be applied in the carrier aggregation system utilizes existing field to place the situation of carrier identification and side-play amount, also can be applied in the situation of utilizing bit that the granularity increase vacates or new field to place carrier identification and side-play amount.Further, place at the bit that utilizes the granularity increase to vacate or new field under the situation of carrier identification and side-play amount, can also place the special value or the symbol that whether are provided with last PDCCH of expression in the position of carrier identification and side-play amount according to PDCCH and judge whether this PDCCH is last PDCCH.

In step 204, terminal detects the PDCCH that belongs to this terminal according to the side-play amount of determining from carrier wave, may further comprise the steps:

The first step: terminal obtains the two kind polymerization grades corresponding with this side-play amount according to the side-play amount of determining among the step 203A.

Second step: from described two kinds of polymerization grades of determining, select and the immediate polymerization grade of polymerization grade of detected PDCCH recently.

The 3rd step: terminal detects the PDCCH that belongs to this terminal in the search volume of the immediate polymerization grade of polymerization grade of the nearest detected PDCCH that selects;

The 4th step: if the 3rd step was detected the PDCCH success, then detected PDCCH is the detected PDCCH that belongs to this terminal from the carrier wave of determining; Otherwise, detect the PDCCH that belongs to this terminal in the search volume of the another kind of polymerization grade from described two kinds of polymerization grades.

For example: if side-play amount is to place in the HARQ of PDCCH process id field, the value in a kind of possible HARQ process id field and the corresponding relation of side-play amount can be as shown in table 2.

Table 2

If the value that HARQ process id field is placed among the detected recently PDCCH is 3, then can determine from table 2: the polymerization grade of PDCCH to be detected is 1 or 2, and PDCCH to be detected side-play amount in carrier wave is 3.

When the polymerization grade of detected PDCCH is 1 recently, the carrier wave of the carrier identification correspondence of placing among the definite detected PDCCH of terminal, and at first to detect polymerization grade in this carrier wave be that side-play amount is 3 PDCCH in 1 the search volume, if this PDCCH is the PDCCH that belongs to described terminal, then continue to carry out subsequent operation; Otherwise detect polymerization grade in this carrier wave again and be side-play amount in 2 the search volume and be 3 PDCCH.

When the polymerization grade of detected PDCCH is 2 recently, the carrier wave of the carrier identification correspondence of placing among the definite detected PDCCH of terminal, and at first to detect polymerization grade in this carrier wave be that side-play amount is 3 PDCCH in 2 the search volume, if this PDCCH is the PDCCH that belongs to described terminal, then continue to carry out subsequent operation; Otherwise detect polymerization grade in this carrier wave again and be side-play amount in 1 the search volume and be 3 PDCCH.

If the value that HARQ process id field is placed among the detected recently PDCCH is 7, then can determine from table 2: the polymerization grade of PDCCH to be detected is 4 or 8, and PDCCH to be detected side-play amount in carrier wave is 1.

When the polymerization grade of detected PDCCH is 2 recently, the carrier wave of the carrier identification correspondence of placing among the definite detected PDCCH of terminal, and at first to detect side-play amount in the search volume that polymerization grade in this carrier wave is 4 (4 to 8 more near 2) be 1 PDCCH, if this PDCCH is the PDCCH that belongs to described terminal, then continue to carry out subsequent operation; Otherwise detect polymerization grade in this carrier wave again and be side-play amount in 8 the search volume and be 1 PDCCH.

Belong under the same inventive concept with the embodiment of the invention one, the embodiment of the invention three also provides the indicating equipment of PDCCH in a kind of carrier aggregation system, as shown in Figure 9, described equipment comprises positional information determination module 11 and placement module 12, wherein: carrier identification determination module 11 is used to determine to belong to the PDCCH of a certain terminal, and determines to have the positional information of the carrier wave of described PDCCH, wherein, the corresponding carrier wave of each PDCCH, and the carrier wave difference of any two PDCCH correspondences; The positional information that placement module 12 is used for determining places described PDCCH, and the carrier wave of the positional information correspondence of placing among the PDCCH is different with the carrier wave at this PDCCH place, indicates described terminal to determine to have the carrier wave of described PDCCH according to described carrier identification.Placement module 12 is used for placing a carrier identification of determining at a PDCCH further, when the number of the PDCCH that determines is at least 3, and the PDCCH that the carrier identification of any two carrier wave correspondences can not place the other side to have.The carrier wave that placement module 12 also is used for having PDCCH further is as main carrier, and with in the positional information of determining, other positional informations except that the main carrier corresponding position information place the PDCCH of main carrier.

Described equipment also comprises side-play amount determination module 13, is used for determining respectively the side-play amount of each PDCCH in the searching carrier space; The side-play amount of PDCCH in carrier wave that described placement module 12 is further used for determining places the PDCCH of the carrier identification of placing this carrier wave correspondence.

The indicating equipment of PDCCH can be the base station in the carrier aggregation system in the embodiment of the invention three.

Belong under the same inventive concept with the embodiment of the invention two, the embodiment of the invention four also provides the equipment of a kind of PDCCH of detection, as shown in figure 10, comprise first detection module 21, positional information detection module 22 and second detection module 23, wherein: first detection module 21 is used for detecting the PDCCH that belongs to a certain terminal from a carrier wave of carrier aggregation system; Positional information detection module 22 is used for the positional information that definite nearest detected PDCCH places; Second detection module 23 is used for detecting the PDCCH that belongs to described terminal from the carrier wave of described positional information correspondence.

Described equipment comprises that also PDCCH searches module 24, be used for determining whether described carrier aggregation system also exists the nd PDCCH that belongs to described terminal, and when having the nd PDCCH that belongs to described terminal, trigger described positional information detection module 22.

Described positional information detection module 22 is used for also determining that the positional information that nearest detected PDCCH places is a carrier wave corresponding position information, or a plurality of carrier wave difference corresponding position information.

Present embodiment also comprises side-play amount detection module 25, is used for determining the side-play amount of placing among the nearest detected PDCCH when determining that there is the nd PDCCH that belongs to described terminal in described carrier aggregation system.

Second detection module 23 triggers described PDCCH and searches module 24 after being further used for detecting the PDCCH that belongs to described terminal from the carrier wave of described positional information correspondence.

Described second detection module 23 comprises first implementation sub-module 31 and second implementation sub-module 32, and wherein: first implementation sub-module 31 is used for the positional information determined according to positional information detection module 22, determines to have the carrier wave of the PDCCH that belongs to described terminal; Second implementation sub-module 32 is used for according to side-play amount detection module 25 detected side-play amounts, detects the PDCCH that belongs to described terminal in the search volume from the carrier wave that first implementation sub-module 31 is determined.

Described second implementation sub-module 32 comprises that the polymerization grade determines submodule 41, polymerization grade chooser module 42 and operation submodule 43, and wherein: the polymerization grade determines that submodule 41 is used for determining the two kind polymerization grades corresponding with this side-play amount according to described side-play amount; Polymerization grade chooser module 42 is used for from the described two kinds of polymerization grades selection determined and the immediate polymerization grade of polymerization grade of nearest detected PDCCH; Operation submodule 43 is used for detecting the PDCCH that belongs to described terminal in the search volume of the immediate polymerization grade of polymerization grade of the nearest detected PDCCH that selects, if detect successfully, then detected PDCCH is the detected PDCCH that belongs to this terminal from the carrier wave of determining, otherwise, detect the PDCCH that belongs to this terminal in the search volume of the another kind of polymerization grade from described two kinds of polymerization grades.

Described PDCCH searches module 24 and comprises the first xor operation submodule 33, the first syndrome module 34, the second xor operation submodule 35 and the second syndrome module 36, wherein: the first xor operation submodule 33 is used for the first sign mask of 16 bit-identifies of the 16 bit check positions of CRC, described terminal and nearest detected PDCCH is carried out xor operation, and the described first sign mask represents that this PDCCH is not last PDCCH that belongs to this terminal in the described carrier aggregation system; The first syndrome module 34 is used for the data that obtain behind the first xor operation submodule, 33 xor operations are carried out CRC check, if verification is passed through, then determines also to have the nd PDCCH that belongs to described terminal in the described carrier aggregation system; Otherwise, trigger the second XOR submodule 35; The second xor operation submodule 35 is used for the second sign mask of 16 bit-identifies of the 16 bit check positions of CRC, described terminal and nearest detected PDCCH is carried out xor operation, and the described second sign mask represents that this PDCCH is last PDCCH that belongs to this terminal in the described carrier aggregation system; The second syndrome module 36 is used for the data that obtain behind the second xor operation submodule, 35 xor operations are carried out CRC check, when verification is passed through, determines not exist in the described carrier aggregation system the nd PDCCH that belongs to described terminal.

The equipment of detection PDCCH in the embodiment of the invention four can be terminal, and the positional information that relates to is the carrier identification of carrier wave.

The embodiment of the invention five also provides a kind of communication system, as shown in figure 11, described communication system comprises base station 41 and terminal 42, wherein: base station 41 is used to determine to belong to the PDCCH of terminal, and determine to have the positional information of the carrier wave of described PDCCH, and the positional information of determining placed the PDCCH that belongs to described terminal, wherein, the carrier wave of the positional information correspondence of placing among the PDCCH is different with the carrier wave at this PDCCH place, and, the corresponding carrier wave of each PDCCH, and the carrier wave difference of any two PDCCH correspondences; Terminal 42 is used for detecting the PDCCH that belongs to this terminal from a carrier wave of carrier aggregation system, and, determine the positional information of in detected described PDCCH, placing, and from the carrier wave of described positional information correspondence, detect the PDCCH that belongs to this terminal.

Described base station 41 also is used for placing a definite positional information at a PDCCH, perhaps, a carrier wave that will have PDCCH is as main carrier, and with in the positional information of determining, other positional informations except that the main carrier corresponding position information place the PDCCH of main carrier; Described terminal 42 is used for also determining that the positional information that nearest detected PDCCH places is a carrier wave corresponding position information, or a plurality of carrier wave difference corresponding position information.

Described base station 41 also is used for determining respectively the side-play amount of each described PDCCH in the searching carrier space, and the side-play amount of described PDCCH in carrier wave that will determine places the PDCCH that places this carrier wave corresponding position information; Described terminal 42 also is used for determining to have according to the described positional information of placing at detected described PDCCH the carrier wave of the PDCCH that belongs to this terminal, and, detect the PDCCH that belongs to this terminal in the search volume from the carrier wave of determining according to the described side-play amount of in detected described PDCCH, placing.

Described positional information in the present embodiment is the carrier identification of carrier wave.

By the method, apparatus and system that the embodiment of the invention provides, less to the protocol changes of prior LTE system and LTE-A system, have better compatibility backward; Terminal need not to carry out blind Detecting on all carrier waves, can utilize the positional information of PDCCH indication in arbitrary carrier wave or the main carrier, determines that other have the carrier wave of the PDCCH of terminal.For example: when positional information is carrier identification, utilize i (i=0, ..., N-2, N is not more than carrier number) carrier identification among the individual PDCCH indicates the carrier wave at i+1 PDCCH place, and utilize i the side-play amount among the PDCCH to indicate the side-play amount of i+1 PDCCH in the search volume, terminal can directly detect PDCCH in the carrier wave of determining; Perhaps, utilize a plurality of carrier identification among the PDCCH in the main carrier, determine a plurality of carrier waves respectively, significantly reduced the number of times of blind Detecting with terminal PDCCH.Use the present invention, terminal has reduced the complexity and the power consumption of terminal except need can only carrying out 2 times blind Detecting on all the other carrier waves the blind Detecting of carrying out the LTE regulation on the main carrier.

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. the indicating means of physical downlink control channel PDCCH in the carrier aggregation system is characterized in that, said method comprising the steps of:

2. the method for claim 1 is characterized in that, described base station places the PDCCH that belongs to described terminal with the positional information of determining, comprising:

A positional information of determining is placed in the base station in a PDCCH.

3. method as claimed in claim 2 is characterized in that,

When the number of the PDCCH that belongs to described terminal that determines is at least 3, if have the described PDCCH that the first carrier corresponding position information of described PDCCH places second carrier wave to have, the then described second carrier wave corresponding position information places the PDCCH of other carrier waves of carrier wave except that first carrier with described PDCCH.

4. the method for claim 1 is characterized in that, the positional information of determining is placed the PDCCH that belongs to described terminal, comprising:

The base station will have the carrier wave of PDCCH as main carrier, and with in the positional information of determining, other positional informations except that the main carrier corresponding position information place the PDCCH of main carrier.

5. the method for claim 1, it is characterized in that, the positional information of determining is placed first special field of PDCCH, described first special field is that the through-put power among the PDCCH is controlled the resource allocation field among TPC field or the PDCCH, or the new field among the PDCCH, or the DCIFormat field among the PDCCH.

6. method as claimed in claim 5 is characterized in that, determines to have after the positional information of carrier wave of described PDCCH, and the positional information of determining is placed before the described PDCCH, and described method is further comprising the steps of:

Determine the side-play amount of each described PDCCH in the searching carrier space respectively;

Described the positional information of determining is placed after the described PDCCH, described method is further comprising the steps of:

The side-play amount of described PDCCH in carrier wave of determining placed the PDCCH that places this carrier wave corresponding position information.

7. method as claimed in claim 6 is characterized in that, the side-play amount of PDCCH in carrier wave of determining is placed second special field of the PDCCH that places this carrier wave corresponding position information;

If the DCI form of described PDCCH is 1,1A, 1B, 1C, 1D, 2 or 2A, then second special field is automatic retransmission request process sign HARQ process id field of mixing among the PDCCH or the new field among the PDCCH;

If the DCI form of described PDCCH is 0, then second special field is the cyclic shift Cyclic shift for DM RS field of the demodulated reference signal among the PDCCH or the new field among the PDCCH.

8. as the arbitrary described method of claim 1～7, it is characterized in that the positional information of described carrier wave is the carrier identification of carrier wave.

9. the method for a method detection PDCCH according to claim 1 is characterized in that, said method comprising the steps of:

10. method as claimed in claim 9 is characterized in that, what place in detected described PDCCH is a carrier wave corresponding position information, or a plurality of carrier wave difference corresponding position information.

11. method as claimed in claim 9 is characterized in that, terminal detects from the carrier wave of described positional information correspondence and belongs to after the PDCCH of this terminal, and described method is further comprising the steps of:

If terminal does not successfully detect the PDCCH that belongs to this terminal from the carrier wave of described positional information correspondence, then whether also there is the nd PDCCH that belongs to this terminal in the described carrier aggregation system of terminal judges;

If select a carrier wave in the carrier wave that terminal never detected, and in the carrier wave of selecting, detect PDCCH by the mode of blind Detecting;

Otherwise, stop to detect.

12. method as claimed in claim 9 is characterized in that, detects the PDCCH that belongs to this terminal in the carrier wave of described terminal from carrier aggregation system, may further comprise the steps:

Terminal is selected a carrier wave from carrier aggregation system, and detects PDCCH by the mode of blind Detecting in the carrier wave of selecting.

13. method as claimed in claim 12 is characterized in that, terminal is selected a carrier wave from carrier aggregation system, comprising:

Terminal is selected a carrier wave at random from carrier aggregation system, perhaps, from carrier aggregation system, determine main carrier according to the indication information that the base station issues, and with the carrier wave of definite main carrier as selection, perhaps, according to the ascending or descending order of positional information, select a carrier wave.

14. method as claimed in claim 9 is characterized in that, terminal determines after the positional information among the detected described PDCCH, and detects from the carrier wave of positional information correspondence before the PDCCH that belongs to this terminal, and described method is further comprising the steps of:

Terminal is determined the side-play amount of placing in detected described PDCCH;

Terminal detects the PDCCH that belongs to this terminal from the carrier wave of described positional information correspondence, may further comprise the steps:

Terminal determines to have the carrier wave of the PDCCH that belongs to this terminal according to the described positional information of placing in detected described PDCCH;

Terminal detects the PDCCH that belongs to this terminal according to the described side-play amount of placing in the search volume from the carrier wave of determining in detected described PDCCH.

15. method as claimed in claim 14 is characterized in that, terminal detects the PDCCH that belongs to this terminal according to the described side-play amount of determining from the carrier wave of determining, may further comprise the steps:

Terminal is determined the two kind polymerization grades corresponding with this side-play amount according to described side-play amount;

From described two kinds of polymerization grades of determining, select the immediate polymerization grade of polymerization grade with nearest detected PDCCH;

Terminal detects the PDCCH that belongs to this terminal in the search volume of the immediate polymerization grade of polymerization grade of the nearest detected PDCCH that selects;

If detect successfully, then detected PDCCH is the detected PDCCH that belongs to this terminal from the carrier wave of determining;

Otherwise, detect the PDCCH that belongs to this terminal in the search volume of the another kind of polymerization grade from described two kinds of polymerization grades.

16. method as claimed in claim 11 is characterized in that, determines also to have the nd PDCCH that belongs to described terminal in the described carrier aggregation system, may further comprise the steps:

16 bit-identifies of 16 bit check positions of cyclic redundancy check (CRC), described terminal and the first sign mask of nearest detected PDCCH are carried out xor operation, and the described first sign mask represents that this PDCCH is not last PDCCH that belongs to this terminal in the described carrier aggregation system;

The data that obtain behind the xor operation are carried out CRC check,, then determine also to have the nd PDCCH that belongs to described terminal in the described carrier aggregation system if verification is passed through; Otherwise,

16 bit-identifies of the 16 bit check positions of CRC, described terminal and the second sign mask of nearest detected PDCCH are carried out xor operation, and the described second sign mask represents that this PDCCH is last PDCCH that belongs to this terminal in the described carrier aggregation system;

The data that obtain behind the xor operation are carried out CRC check, when verification is passed through, determine not exist in the described carrier aggregation system the nd PDCCH that belongs to described terminal.

17., it is characterized in that described positional information is the carrier identification of carrier wave as the arbitrary described method of claim 9～16.

18. the indicating equipment of PDCCH in the carrier aggregation system is characterized in that described equipment comprises:

19. equipment as claimed in claim 18 is characterized in that,

Described placement module also is used for placing a positional information at a PDCCH; Perhaps, a carrier wave that will have PDCCH is as main carrier, and with in the positional information of determining, other positional informations except that the main carrier corresponding position information place the PDCCH of main carrier.

20., it is characterized in that described equipment also comprises as claim 18 or 19 described equipment:

The side-play amount determination module is used for determining respectively the side-play amount of each described PDCCH in the searching carrier space;

Described placement module, the side-play amount of described PDCCH in carrier wave that is further used for determining places the PDCCH that places this carrier wave corresponding position information.

21., it is characterized in that described positional information is the carrier identification of carrier wave as claim 18 or 19 described equipment.

22. a positional information of determining according to the indicating equipment of claim 18 detects the equipment of PDCCH, it is characterized in that, comprises first detection module, positional information detection module and second detection module, wherein:

23. equipment as claimed in claim 22 is characterized in that, described equipment also comprises:

PDCCH searches module, is used for determining whether described carrier aggregation system also exists the nd PDCCH that belongs to described terminal, and when having the nd PDCCH that belongs to described terminal, triggers described positional information detection module.

24. equipment as claimed in claim 22 is characterized in that,

Described positional information detection module is used for also determining that the positional information that nearest detected PDCCH places is a carrier wave corresponding position information, or a plurality of carrier wave difference corresponding position information.

25. equipment as claimed in claim 23 is characterized in that, described equipment also comprises:

The side-play amount detection module is used for determining the side-play amount of placing among the nearest detected PDCCH when determining that there is the nd PDCCH that belongs to described terminal in described carrier aggregation system;

Described second detection module comprises:

First implementation sub-module is used for the positional information definite according to the positional information detection module, determines to have the carrier wave of the PDCCH that belongs to described terminal;

Second implementation sub-module is used for according to the detected side-play amount of side-play amount detection module, detects the PDCCH that belongs to described terminal in the search volume from the carrier wave that first implementation sub-module is determined.

26. equipment as claimed in claim 23 is characterized in that,

Second detection module after being further used for successfully detecting the PDCCH that belongs to described terminal from the carrier wave of described positional information correspondence, triggers described PDCCH and searches module.

27. equipment as claimed in claim 23 is characterized in that, described PDCCH searches module and comprises:

The first xor operation submodule, be used for 16 bit-identifies of the 16 bit check positions of CRC, described terminal and the first sign mask of nearest detected PDCCH are carried out xor operation, the described first sign mask represents that this PDCCH is not last PDCCH that belongs to this terminal in the described carrier aggregation system;

The first syndrome module is used for the data that obtain behind the first xor operation submodule xor operation are carried out CRC check, if verification is passed through, then determines also to have the nd PDCCH that belongs to described terminal in the described carrier aggregation system; Otherwise, trigger the second XOR submodule;

The second xor operation submodule, be used for 16 bit-identifies of the 16 bit check positions of CRC, described terminal and the second sign mask of nearest detected PDCCH are carried out xor operation, the described second sign mask represents that this PDCCH is last PDCCH that belongs to this terminal in the described carrier aggregation system;

The second syndrome module is used for the data that obtain behind the second xor operation submodule xor operation are carried out CRC check, when verification is passed through, determines not exist in the described carrier aggregation system the nd PDCCH that belongs to described terminal.

28. equipment as claimed in claim 25 is characterized in that, described second implementation sub-module comprises:

The polymerization grade is determined submodule, is used for determining the two kind polymerization grades corresponding with this side-play amount according to described side-play amount;

Polymerization grade chooser module is used for from definite described two kinds of polymerization grades selection and the immediate polymerization grade of polymerization grade of nearest detected PDCCH;

The operation submodule, be used in the search volume of the immediate polymerization grade of polymerization grade of the nearest detected PDCCH that selects, detecting the PDCCH that belongs to described terminal, if detect successfully, then detected PDCCH is the detected PDCCH that belongs to this terminal from the carrier wave of determining, otherwise, from described two kinds of polymerizations

Detect the PDCCH that belongs to this terminal in the search volume of the another kind of polymerization grade in the grade.

29., it is characterized in that described positional information is the carrier identification of carrier wave as the arbitrary described equipment of claim 22～28.

30. a communication system is characterized in that, described system comprises:

31. system as claimed in claim 30 is characterized in that,

Described base station, also be used for placing a definite positional information at a PDCCH, perhaps, a carrier wave that will have PDCCH is as main carrier, and with in the positional information of determining, other positional informations except that the main carrier corresponding position information place the PDCCH of main carrier;

Described terminal is used for also determining that the positional information that nearest detected PDCCH places is a carrier wave corresponding position information, or a plurality of carrier wave difference corresponding position information.

32. system as claimed in claim 30 is characterized in that,

Described base station also be used for determining respectively the side-play amount of each described PDCCH in the searching carrier space, and the side-play amount of described PDCCH in carrier wave that will determine places the PDCCH that places this carrier wave corresponding position information;

Described terminal, also be used for determining to have the carrier wave of the PDCCH that belongs to this terminal according to the described positional information of placing at detected described PDCCH, and, detect the PDCCH that belongs to this terminal in the search volume from the carrier wave of determining according to the described side-play amount of in detected described PDCCH, placing.

33., it is characterized in that described positional information is the carrier identification of carrier wave as the arbitrary described system of claim 30～32.