CN103582135A

CN103582135A - Methods for configuring eCCEs used for ePDCCH

Info

Publication number: CN103582135A
Application number: CN201210265061.1A
Authority: CN
Inventors: 蒋琦; 刘铮; 马修·贝克
Original assignee: Alcatel Lucent Shanghai Bell Co Ltd; Alcatel Optical Networks Israel Ltd
Current assignee: Nokia Shanghai Bell Co Ltd; Alcatel Lucent SAS; Alcatel Optical Networks Israel Ltd
Priority date: 2012-07-27
Filing date: 2012-07-27
Publication date: 2014-02-12
Anticipated expiration: 2032-07-27
Also published as: WO2014016672A1; TW201417606A; CN103582135B

Abstract

The invention discloses methods for configuring eCCEs used for an ePDCCH in a network body of a communication system. According to one method for configuring the eCCEs used for the ePDCCH in the network body of the communication system, the network body can determine the number of the eCCEs and the number of resource elements occupied by each eCCE according to the number of available resource elements in a physical resource block pair. According to another method for configuring the eCCEs used for the ePDCCH in the network body of the communication system, the network body can further determine the number of eREGs occupied by each eCCE and the number of resource elements occupied by each eREG according to the number of the resource elements occupied by the eCCEs. According to the methods for configuring the eCCEs used for the ePDCCH in the network body of the communication system, original configuration of a PDCCH can be compatible, and the standardization progress is accelerated.

Description

A kind of method that is configured for the eCCE of ePDCCH

Technical field

The present invention relates to communication system, relate more specifically to, a kind of method that is configured for the eCCE of ePDCCH.

Background technology

For existing Physical Downlink Control Channel (PDCCH), each PDCCH is used one or more control channel elements (Control Channel Element, CCE) carry out communication, wherein each CCE is corresponding 9 groups, every group comprises 4 resource element (Resource Element, RE) resource element group (Resource Element Group, REG).

And it is current in 3GPP Rel-11, considering to strengthen Inter-Cell Interference Coordination (enhanced intercell interference coordination, eICIC), in the situation such as multipoint cooperative communication CoMP and downlink mimo, paid close attention to emphatically strengthening the design of Physical Downlink Control Channel (ePDCCH).Because ePDCCH is arranged in data field, so need to formulate the new rule different from PDCCH for ePDCCH, and need to consider following main points at this: strengthen control channel element/enhancing resource element group (enhanced Control Channel Element/enhanced Resource Element Group, eCCE/eREG) definition, whether support interweaving and the mapping ruler of resource element of eREG aspect.Wherein, each ePDCCH is by transmitting with eCCE.

And in RAN1 meeting #69bis, formulated with classical signal crash scenario under resource element mapping ruler.For example, during one or more generation in following four kinds of situations, base station and subscriber equipment all can use chain encoding rate coupling (coding chain rate-matching): be provided with public reference signal (common reference signal, CRS) 1.; 2. be provided with the new antenna port for new carrier type (New Carrier Type); 3. the various situations of the OFDM symbol that Physical Downlink Control Channel (PDCCH) takies (for example, taking 1 symbol, 2 symbols, 3 symbols); 4. be provided with PBCH (Physical Broadcast Channel) and PSS/SSS (master sync signal/auxiliary synchronous signals).In addition, in this meeting also formulated according to concrete situation, for subscriber equipment arranges zero energy channel status reference signal (CSI-RS) and non-zero power CSI-RS.

Yet, up to now, the specific design of the eCCE for ePDCCH and configuration were not carried out to discussion, for example, in the quantity of the eCCE of a Physical Resource Block centering, the resource element quantity that each eCCE comprises, whether support the eCCE/eREG of flexibility and changeability quantity, the quantity of the resource element that the quantity of the eREG that each eCCE comprises and each eREG occupy.

Summary of the invention

Visible, according to background technology, lack at present the research to eCCE concrete configuration.

Therefore, for existing problem in background technology, according to a first aspect of the invention, a kind of method that is configured for the eCCE of ePDCCH in the network entity of communication system has been proposed, wherein, said method comprising the steps of: a. determines the quantity of the quantity of eCCE of Physical Resource Block centering and the shared resource element of each eCCE.

A preferred embodiment according to the present invention, step a further comprises: a11. determines the quantity of the resource element that described Physical Resource Block centering can be used, and a12. is defined as 4 by the quantity of the eCCE of described Physical Resource Block centering, and the quantity of the eCCE based on determined Physical Resource Block centering is determined the quantity of the resource element that average each eCCE is shared, and a13. is when the quantity of the shared resource element of described average each eCCE is integer, the quantity of the shared resource element of described average each eCCE is defined as to the quantity of the shared resource element of each eCCE, when the quantity of the shared resource element of described average each eCCE is non-integer, described in execution step a13-1 or a13-2:a13-1., network entity comprises base station and subscriber equipment, and when described base station and shared the first pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eCCE is shared based on described the first pre-defined rule, a13-2. described network entity comprises base station and subscriber equipment, and when the first pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eCCE is shared is determined in described base station based on described the first pre-defined rule, and send the first information to described subscriber equipment, the described first information is indicated the quantity of the shared eCCE of described subscriber equipment and the shared resource element of this eCCE, and described subscriber equipment receives the described first information from described base station, and based on the described first information, determine the quantity of eCCE that it is shared and the shared resource element of this eCCE.

Above-described embodiment has been described the method for quantity of eCCE of fixed configurations Physical Resource Block centering a kind of, has simplified thus implementation process.

According to a preferred embodiment of the present invention, step a further comprises that a21. determines the quantity of the resource element that described Physical Resource Block centering can be used, a22. when the quantity of described available resource element is during greater than or equal to first threshold, determine the eCCE of the first quantity, and the eCCE based on described the first quantity determines the quantity of the resource element that average each eCCE is shared, when the quantity of described available resource element is during lower than described first threshold, determine the eCCE of the second quantity, and the eCCE based on described the second quantity determines the quantity of the resource element that average each eCCE is shared, and a23. is when the quantity of the shared resource element of described average each eCCE is integer, the quantity of the shared resource element of described average each eCCE is defined as to the quantity of the shared resource element of each eCCE, when the quantity of the shared resource element of described average each eCCE is non-integer, described in execution step a23-1 or a23-2:a23-1., network entity comprises base station and subscriber equipment, and when described base station and shared the second pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eCCE is shared based on described the second pre-defined rule, a23-2. described network entity comprises base station and subscriber equipment, and when the second pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eCCE is shared is determined in described base station based on described the second pre-defined rule, and send the second information to described subscriber equipment, described the second information is indicated the quantity of the shared eCCE of described subscriber equipment and the shared resource element of this eCCE, and described subscriber equipment receives described the second information from described base station, and based on described the second information, determine the quantity of eCCE that it is shared and the shared resource element of this eCCE.

Above-described embodiment has been described the method for quantity of eCCE of flexible configuration Physical Resource Block centering a kind of, and the resource element that can use according to current physical piece centering is thus the quantity of flexible configuration eCCE usually, has therefore optimized implementation process.

According to a preferred embodiment of the present invention, described the first pre-defined rule and/or described the second pre-defined rule comprise the difference between the quantity that minimizes the shared resource element of each eCCE.If owing to having two or more eCCE in a continuous resource, its decay of experiencing channel is close.Therefore, in the time of can being non-integer in the quantity of the shared resource element of average each eCCE, the difference minimizing between the quantity of the shared resource element of each eCCE of take is come as each eCCE Resources allocation element.For example, when using at 63 resource elements, and have in the situation of two eCCE, can distribute 31 resource elements for an eCCE, another eCCE distributes 32 resource elements.Although second eCCE overabsorption a resource element, in real system, coding is very flexibly, base station can be for example by encrypting code check, allotment power adjustment (for example allocating the power of last resource element) is processed above-mentioned situation.

According to a preferred embodiment of the present invention, the eCCE of described the first quantity is 4, and the eCCE of described the second quantity is 2.By the quantity of configuration like this eCCE, can be so that the polymerization level of the quantity of the eCCE of Physical Resource Block centering and current use 1,2,3,4} (aggregation level) matches, and has been convenient to thus realize the blind decoding of ePDCCH.

According to a preferred embodiment of the present invention, described first threshold is 72.At this, a Physical Resource Block centering has 168 resource elements, and the demodulation of ePDCCH is based on to the demodulated reference signal DM-RS (Demodulation Reference Signal) transmitting in the Physical Resource Block of distributing to Downlink Control Information transmission, DM-RS need to take 24 resource elements at present, therefore Physical Resource Block centering also remains 144 resource elements, and Physical Resource Block centering has at most 144 resource elements to use.Visible, the 72nd, a median.On the other hand, in the CCE using at existing PDCCH, each CCE has 36 resource elements.So choose 72 amounts that are equivalent to choose the resource element suitable with original 2 CCE.Thus, be convenient to have improved the compatibility with original configuration.

According to a preferred embodiment of the present invention, described method also comprises that step b:b. determines the quantity of the quantity of the eREG that an eCCE occupies and the shared resource element of each eREG.

According to a preferred embodiment of the present invention, described step b further comprises: the quantity of the eREG that b11. occupies an eCCE is defined as 4, and determines the quantity of the resource element that average each eREG is shared, and b12. is when the quantity of the shared resource element of described average each eREG is integer, the quantity of the shared resource element of described average each eREG is defined as to the quantity of the shared resource element of each eREG, when the quantity of the shared resource element of described average each eREG is non-integer, described in execution step b12-1 or b12-2:b12-1., network entity comprises base station and subscriber equipment, and when described base station and shared the 3rd pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eREG is shared based on described the 3rd pre-defined rule, b12-2. described network entity comprises base station and subscriber equipment, and when the 3rd pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eREG is shared is determined in described base station based on described the 3rd pre-defined rule, and send the 3rd information to described subscriber equipment, described the 3rd information is indicated the quantity of the shared resource element of each shared eREG of described subscriber equipment, and described subscriber equipment receives described the 3rd information from described base station, and based on described the 3rd information, determine the quantity of the resource element that its each shared eREG is shared.

Above-described embodiment has been described the method for the quantity of the eREG that a kind of eCCE of fixed configurations Physical Resource Block centering occupies, has simplified thus implementation process.

According to a preferred embodiment of the present invention, described step b further comprises: b21. is when the quantity of the shared resource element of determined eCCE is during greater than or equal to Second Threshold, determine that an eCCE occupies the eREG of the 3rd quantity, and determine the quantity of the resource element that average each eREG is shared, when the quantity of the shared resource element of determined eCCE is during lower than described Second Threshold, determine that an eCCE occupies the eREG of the 4th quantity, and determine the quantity of the resource element that average each eREG is shared, and b22. is when the quantity of the shared resource element of described average each eREG is integer, the quantity of the shared resource element of described average each eREG is defined as to the quantity of the shared resource element of each eREG, when the quantity of the shared resource element of described average each eREG is non-integer, described in execution step b22-1 or b22-2:b22-1., network entity comprises base station and subscriber equipment, and when described base station and shared the 4th pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eREG is shared based on described the 4th pre-defined rule, b22-2. described network entity comprises base station and subscriber equipment, and when the 4th pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eREG is shared is determined in described base station based on described the 4th pre-defined rule, and send the 4th information to described subscriber equipment, described the 4th information is indicated the quantity of the shared resource element of each shared eREG of described subscriber equipment, and described subscriber equipment receives described the 4th information from described base station, and based on described the 4th information, determine the quantity of the resource element that its each shared eREG is shared.

Above-described embodiment has been described the method for the quantity of the eREG that a kind of eCCE of flexible configuration Physical Resource Block centering occupies, the resource element that can use according to current physical piece centering thus, and then carry out the quantity of flexible configuration eREG according to the quantity of the shared resource element of average each eCCE, so optimized implementation process.

According to a preferred embodiment of the present invention, described the 3rd pre-defined rule and/or described the 4th pre-defined rule comprise the difference between the quantity that minimizes the shared resource element of each eREG.

According to a preferred embodiment of the present invention, the eREG of described the 3rd quantity is 4, and the eREG of described the 4th quantity is 2.

According to a preferred embodiment of the present invention, described Second Threshold is 16.

By the preferred embodiment of the invention, can compatible previously some original configurations of PDCCH, accelerated standardized process simultaneously.

Accompanying drawing explanation

By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, other features, objects and advantages of the present invention will become more apparent:

Fig. 1 shows the flow chart of method according to an embodiment of the invention;

Fig. 2 shows the flow chart of the method for the step S1 in enforcement Fig. 1 according to an embodiment of the invention;

Fig. 3 shows the flow chart of the method for the step S1 in enforcement Fig. 1 according to another embodiment of the invention;

Fig. 4 shows the flow chart of the method for the step S2 in enforcement Fig. 1 according to an embodiment of the invention; And

Fig. 5 shows the flow chart of the method for the step S2 in enforcement Fig. 1 according to another embodiment of the invention.

In the drawings, run through different diagrams, same or similar Reference numeral represents identical or corresponding parts or feature.

Embodiment

Fig. 1 shows the flow chart of method according to an embodiment of the invention.As described in Figure 1, the method according to this invention is comprised of 2 parts substantially, and step S1 determines the quantity of the resource element that the quantity of the quantity of eCCE of Physical Resource Block centering and the shared resource element of each eCCE and quantity that step S2 determines the eREG that an eCCE occupies and each eREG are shared.By network entity implementation step S1 and S2.In specification of the present invention, network entity comprises base station and subscriber equipment.

Fig. 2 shows the flow chart of the method for the step S1 in enforcement Fig. 1 according to an embodiment of the invention.In the embodiment described in Fig. 2, a Physical Resource Block centering, fixedly choose 4 eCCE.

Particularly, in step S101, network entity is determined the quantity of the resource element that Physical Resource Block centering can be used.A Physical Resource Block centering has 168 resource elements, and the demodulation of ePDCCH is based on to the demodulated reference signal DM-RS (Demodulation Reference Signal) transmitting in the Physical Resource Block of distributing to Downlink Control Information transmission, DM-RS need to take 24 resource elements at present, so Physical Resource Block centering also remains 144 resource elements.Therefore, network entity need to be determined the quantity of resource element available in these 144 resource elements.

When network entity is base station, the resource element that it can be for example shared according to other signals of Physical Resource Block centering, determines the resource element that a Physical Resource Block centering can be used.Particularly, such as it, can whether there is the resource element that the conditions such as CSI-RS determine that a Physical Resource Block centering can be used according to the antenna port number of the symbolic number of the shared OFDM of PDCCH, CRS, Physical Resource Block centering.Preferably, base station can also judge that the fast centering of physical resource, whether transmitting PBCH, PSS/SSS determines the resource element that a Physical Resource Block centering can be used.Those skilled in the art, should be appreciated that in this base station and can determine the resource element that a Physical Resource Block centering can be used in conjunction with one or more condition said or that do not state.

When network entity is subscriber equipment, the existence that also can know PDCCH, CRS, PSS, SSS, PBCH, CSI-RS due to subscriber equipment whether and/or its configuration, so subscriber equipment also will impliedly dope the quantity of available resource element.

Then, network entity by the quantity of available resource element divided by the quantity of eCCE (in this case 4), to determine the quantity of the resource element that average each eCCE is shared.For example, when having 144 resource elements available, the quantity of the shared resource element of average each eCCE is 36, when having 72 resource elements available, the quantity of the shared resource element of average each eCCE is 18, when having 106 resource elements available, the quantity of the shared resource element of average each eCCE is 26.5.

When the quantity of the shared resource element of average each eCCE is integer, method enters step S203.In step S203, network entity is defined as the quantity of the shared resource element of average each eCCE the quantity of the shared resource element of each eCCE.For 144 resource elements, can use this situation, the quantity of the shared resource element of 4 eCCE is all defined as to 36,36,36,36.

When the quantity of the shared resource element of average each eCCE is non-integer, need to judge whether base station and subscriber equipment be shared has the first pre-defined rule.When base station and subscriber equipment, share while having the first pre-defined rule, method enters step S204.Otherwise enter step S205.

Particularly, for example for 106 resource elements, can use, the quantity of the resource element that average each eCCE is shared is 26.5 this situations, if base station and subscriber equipment are shared and had (predefine has) that the quantity of the resource element of 4 eCCE is set to respectively to 26,26,27,27 these rules in advance, base station and subscriber equipment can be determined respectively the quantity of each the shared resource element in these 4 eCCE according to this pre-defined rule.At this, this pre-defined rule is preferably the difference between the quantity that minimizes the shared resource element of each eCCE.Certainly, at this, do not get rid of other applicable rules yet.This pre-defined rule that for example base station and subscriber equipment are shared can be also 28,28,25,25.

And do not share while having above-mentioned rule when base station and subscriber equipment, the quantity of the resource element that each eCCE is shared is determined in base station based on this pre-defined rule, determine 26, 26, 27, 27, and send the first information to subscriber equipment, (this information for example can be passed through public search space (Common Searching Space to the quantity of the resource element that the eCCE that this first information equipment for indicating user is shared and this eCCE are shared, CSS) control information realizes or passes through high-level signaling, radio resource control signaling (Radio Resource Control for example, RRC) send).Subsequently, subscriber equipment is determined the quantity of eCCE that it is shared and the shared resource element of this eCCE based on the first information.

In the embodiment of another variation, when the quantity of the resource element that each eCCE is shared is determined to be different from the rule of the first pre-defined rule in base station, for example, in above-mentioned example, when the quantity of the resource element of 4 eCCE is set to respectively to 28,26,25,27 or 30,22,27,27 etc., subscriber equipment also can be told by above-mentioned configuration by the first information in base station, so that subscriber equipment carries out follow-up operation.

In the embodiment of another variation, if these 4 eCCE difference correspondences are 2 subscriber equipmenies for example, preferably, base station need to send respectively information to these two subscriber equipmenies, to tell the quantity of the resource element in its corresponding eCCE of these two subscriber equipmenies and corresponding eCCE, thereby avoid the unnecessary too much blind decoding of subscriber equipment.

Therefore, by step S205, subscriber equipment has under the situation of pre-defined rule not having to share, and can receive the first information from base station, and determines accordingly the quantity of its shared eCCE and the shared resource element of eCCE.Certainly, even if exist under the situation of a plurality of subscriber equipmenies, subscriber equipment also can be known by applicable signaling the quantity of eCCE that other subscriber equipment is shared and the shared resource element of eCCE.

In sum, in the step shown in Fig. 2, base station and subscriber equipment (network entity) can be distinguished implementation step S201, S202, S203 and S204 independently.Only, in step S205, need base station to send extra message and come to carry out alternately with subscriber equipment, thereby complete the eCCE configuration for ePDCCH.

Fig. 3 shows the flow chart of the method for the step S 1 in enforcement Fig. 1 according to another embodiment of the invention.Embodiment shown in Fig. 3 has described the method for quantity of eCCE of flexible configuration Physical Resource Block centering a kind of, and the resource element that can use according to current physical piece centering is thus the quantity of flexible configuration eCCE usually, has therefore optimized implementation process.

Particularly, step S301 is similar to the step S201 in Fig. 2, and network entity is determined the quantity of the resource element that Physical Resource Block centering can be used.Process in its deterministic process and step S201 is similar, is not described in detail in this.

In step S302, when the quantity of available resource element is during greater than or equal to first threshold, network entity is determined the eCCE of the first quantity, and the eCCE based on the first quantity determines the quantity of the resource element that average each eCCE is shared, when the quantity of available resource element is during lower than first threshold, network entity is determined the eCCE of the second quantity, and the eCCE based on the second quantity determines the quantity of the resource element that average each eCCE is shared.

Particularly, in this case for the purpose of example, the eCCE that the eCCE of the first quantity is set to 2, the second quantity is set to 4, first threshold is set to 72.It is pointed out that those numerical value are only preferred (its advantage are set forth in the preceding article to some extent, is not described in detail in this), and and unrestriced, choose other threshold value and/or the enforcement that do not affect scheme of the quantity of eCCE.For example can also first threshold be set to 80,90 equivalences, the eCCE that the eCCE of the first quantity is set to 3, the second quantity is set to other applicable values such as 6 grades, and this all depends on the concrete enforcement of scheme.For example, when the quantity of the resource element that may comprise is too small, just no longer in this frame, transmit ePDCCH in eCCE.

By take the eCCE that the eCCE of the first quantity is 2, the second quantity, be 4 below, first threshold is 72 to discuss.

Particularly, table 1 and table 2 show respectively Physical Resource Block centering and do not have the configuration scenario of eCCE of PBCH, PSS, SSS and the configuration scenario of the eCCE that Physical Resource Block centering has PBCH, PSS, SSS (at this, table 1 and table 2 are only used for setting forth particularly the present invention, and nonrestrictive).In addition,, due in standard process, will under PBCH, PSS, SSS situation, whether transmit ePDCCH and discuss having Physical Resource Block centering, so configuration to eCCE is categorized into table 1 and table 2 at this.

Table 1 (Physical Resource Block centering does not have PBCH, PSS, SSS)

Table 2 (Physical Resource Block centering has PBCH, PSS, SSS)

In table 1 and 2, the first row has indicated respectively PDCCH symbolic number (quantity of shared RE), CRS port number (quantity of required RE), PBCH, PSS/SSS, CSI-RS and the quantity of the RE that average each eCCE having under 4 eCCE and 2 eCCE situations comprised at each Physical Resource Block, and wherein RE represents resource element.In table, Yes represents to have, and No represents not have.

Referring to table 1 and table 2, the configuration that it is pointed out that CSI-RS is very flexibly, and in table 1 and table 2, CSI-RS is set to take 8 resource elements, and this is only an example.In practice, according to the configuration of base station, can change the quantity of the shared resource element of CSI-RS.In addition because decoding, PDCCH undertaken by CRS, so if there is no CRS, just there is no need to exist PDCCH.For the mark occurring in table 1 and table 2, for example 31.5, this does not show to have resource element half, and only means the quantity of the resource element that average each eCCE is shared, for example have under the situation of 4 eCCE, these 4 eCCE can have respectively 31,32,31,32 resource elements.And, rightmost at table 1 and table 2 all shows each Physical Resource Block to having 4 eCCE and 2 these two kinds of situations of eCCE, this is just convenient to the blind decoding of subscriber equipment, so and be not precluded within unshowned other the situation of eCCE of quantity in table 1 and table 2.

In addition, those skilled in the art should easily understand, under the various situations shown in table 1 and table 2, can draw the resource element value that various signals are shared according to frame structure, also therefore can obtain the quantity of the available resource elements of the Physical Resource Block centering going out as Table 1 and Table 2 below, at this, just no longer describe in detail.

For example, referring to the 7th row in table 1, PDCCH takies an OFDM symbol (taking 10 resource elements), CRS has an antenna port (taking 8 resource elements), the situation without PBCH, PSS/SSS, by taking 144 resource elements after 24 resource elements and deduct 18 to obtain the quantity of current available resource element be in this case 126 removing 24 DM-RS.And be greater than threshold value 72 due to 126, will choose 4 eCCE, by by 126 divided by 4, can obtain the quantity (being 31.5) of the shared resource element of average each eCCE in this example.And for example, referring to the 45th row in table 2, PDCCH takies two OFDM symbols (taking 22 resource elements), CRS has an antenna port (taking 8 resource elements), there is PBCH (taking 46 resource elements), the situation without PSS/SSS, by taking 144 resource elements after 24 resource elements and deduct 76 to obtain the quantity of current available resource element be in this case 68 removing 24 DM-RS.And be less than threshold value 72 due to 68, will choose 2 eCCE, by by 68 divided by 2, can obtain the quantity (being 34) of the shared resource element of average each eCCE in this example.

In a preferred embodiment, network entity (base station and subscriber equipment) all has table 1 and table 2, and according to the rule of step S302, by means of table 1 and table 2, carries out the configuration to eCCE, for example choose the quantity of eCCE, determine the quantity of the resource element that average each eCCE is shared.Certainly, base station and subscriber equipment also can be without table 1 and tables 2, and can alternatively according to current available resource element, usually calculate in real time the quantity of eCCE, determine the quantity of the resource element that average each eCCE is shared.

In sum, base station and subscriber equipment can be determined the quantity of eCCE by step S301 and step S302, and determine thus the quantity of the resource element that average each eCCE is shared.

Then,, when the quantity of the shared resource element of average each eCCE is integer, method enters step S303.

Step S303 and step S203 are similar, and in step S303, network entity is defined as the quantity of the shared resource element of average each eCCE the quantity of the shared resource element of each eCCE.For 144 resource elements, can use this situation, the quantity of the shared resource element of 4 eCCE is all defined as to 36,36,36,36.

Be similar to the relevant step shown in Fig. 2, when the quantity of the shared resource element of average each eCCE is non-integer, need to judge whether base station and subscriber equipment be shared has the second pre-defined rule.When base station and subscriber equipment, share while having the second pre-defined rule, method enters step S304.Otherwise enter step S305.At this, it is pointed out that the second pre-defined rule herein can be identical with the first pre-defined rule above, also can be different.

Step 304 is similar with step 204 corresponding in Fig. 2, the shared resource element of average each eCCE of for example take under 4 eCCE situations is above as 31.5 being example, if base station and subscriber equipment are shared and had (predefine has) that the quantity of the resource element of 4 eCCE is set to respectively to 31,32,31,32 these rules in advance, base station and subscriber equipment can be determined respectively the quantity of each the shared resource element in these 4 eCCE according to this pre-defined rule.At this, this pre-defined rule is preferably the difference between the quantity that minimizes the shared resource element of each eCCE.Certainly, at this, do not get rid of other applicable rules yet.This pre-defined rule that for example base station and subscriber equipment are shared can be also 32,32,32,30.

And do not share while having above-mentioned rule when base station and subscriber equipment, the quantity of the resource element that each eCCE is shared is determined in base station based on this pre-defined rule, determine 31, 32, 31, 32, and send the second information to subscriber equipment, (this information for example can be passed through public search space (Common Searching Space to the quantity of the resource element that the eCCE that this second information equipment for indicating user is shared and this eCCE are shared, CSS) control information realizes or passes through high-level signaling, radio resource control signaling (Radio Resource Control for example, RRC) send).Subsequently, subscriber equipment is determined the quantity of eCCE that it is shared and the shared resource element of this eCCE based on the second information.

In the embodiment of another variation, when the quantity of the resource element that each eCCE is shared is determined to be different from the rule of the first pre-defined rule in base station, for example, in above-mentioned example, when the quantity of the resource element of 4 eCCE is set to respectively to 33,33,30,30 or 33,32,31,30 etc., subscriber equipment also can be told by above-mentioned configuration by the second information in base station, so that subscriber equipment carries out follow-up operation.

Therefore, by step S305, subscriber equipment has under the situation of pre-defined rule not having to share, and can receive from base station the second information, and determines accordingly the quantity of its shared eCCE and the shared resource element of eCCE.Certainly, even if exist under the situation of a plurality of subscriber equipmenies, subscriber equipment also can be known by suitable signaling the quantity of eCCE that other subscriber equipment is shared and the shared resource element of eCCE.

In sum, in the step shown in Fig. 3, base station and subscriber equipment (network entity) can be distinguished implementation step S301, S302, S303 and S304 independently.Only, in step S205, need base station to send extra message and come to carry out alternately with subscriber equipment, thereby complete the eCCE configuration for ePDCCH.

Fig. 4 shows the flow chart of the method for the step S2 in enforcement Fig. 1 according to an embodiment of the invention.In embodiment described in Fig. 4, the quantity of the eREG that an eCCE is occupied is fixedly defined as 4.

Particularly, in step S401, the quantity of the eREG that network entity occupies an eCCE is defined as 4, and determines the quantity of the resource element that average each eREG is shared.For example, by by means of embodiment described in Fig. 2 or Fig. 3, can determine the quantity of the shared resource element of each eCCE.Thus can be by the quantity of the shared resource element of eCCE divided by the quantity of eREG (in this case 4), to determine the quantity of the resource element that average each eREG is shared.For example, above, there are 4 eCCE, these 4 eCCE have respectively under the situation of 31,32,31,32 resource elements, by above-mentioned value respectively divided by 4, thereby the situation at eCCE with 31 resource elements, the quantity of the resource element that average each eREG is shared is 7.75, has under the situation of 32 resource elements at eCCE, and on average the quantity of the shared resource element of each eREG is 8.

When the quantity of the shared resource element of average each eCCE is integer, method enters step S402.In step S402, network entity is defined as the quantity of the shared resource element of average each eREG the quantity of the shared resource element of each eREG.This situation that the quantity of the shared resource element of average each eREG is 8, is all defined as 8,8,8,8 by the quantity of the shared resource element of 4 eCCE.

When the quantity of the shared resource element of average each eREG is non-integer, need to judge whether base station and subscriber equipment be shared has the 3rd pre-defined rule.When base station and subscriber equipment, share while having the 3rd pre-defined rule, method enters step S403.Otherwise enter step S404.

Particularly, for example the quantity for the shared resource element of average each eREG is 7.75 this situations, if base station and subscriber equipment are shared and had (predefine has) that the quantity of the resource element of 4 eREG is set to respectively to 8,8,8,7 these rules in advance, base station and subscriber equipment can be determined respectively the quantity of each the shared resource element in these 4 eREG according to this pre-defined rule.At this, this pre-defined rule is preferably the difference between the quantity that minimizes the shared resource element of each eREG.Certainly, at this, do not get rid of other applicable rules yet.This pre-defined rule that for example base station and subscriber equipment are shared can be also 9,8,7,7.

And do not share while having above-mentioned rule when base station and subscriber equipment, the quantity of the resource element that each eCCE is shared is determined in base station based on this pre-defined rule, determine 8,8,8,7, and send the 3rd information to subscriber equipment, (this information for example can be passed through public search space (Common Searching Space to the quantity of the resource element that shared each eREG of the 3rd information equipment for indicating user is shared, CSS) control information realizes or passes through high-level signaling, for example radio resource control signaling (Radio Resource Control, RRC) sends).Subsequently, subscriber equipment is determined the quantity of the resource element that its each shared eREG is shared based on the 3rd information.

In the embodiment of another variation, when the quantity of the resource element that each eREG is shared is determined to be different from the rule of the 3rd pre-defined rule in base station, for example, in above-mentioned example, when the quantity of the resource element of 4 eREG is set to respectively to 6,8,8,9 etc., subscriber equipment also can be told by above-mentioned configuration by the 3rd information in base station, so that subscriber equipment carries out follow-up operation.

Therefore, by step S404, subscriber equipment has under the situation of pre-defined rule not having to share, and can receive from base station the 3rd information, and determines accordingly the quantity of its shared eREG and the shared resource element of eREG.

In sum, in the step shown in Fig. 4, base station and subscriber equipment (network entity) can be distinguished implementation step S401, S402, S403 independently.Only, in step S405, need base station to send extra message and come to carry out alternately with subscriber equipment, thereby complete the configuration to eREG, to the eCCE configuration for ePDCCH.

Fig. 5 shows the flow chart of the method for the step S2 in enforcement Fig. 1 according to another embodiment of the invention.Embodiment shown in Fig. 5 has described the method for the quantity of the eREG that a kind of eCCE of flexible configuration Physical Resource Block centering occupies, the resource element that can use according to current physical piece centering thus, and then carry out the quantity of flexible configuration eREG according to the quantity of the shared resource element of average each eCCE, so optimized implementation process.

Particularly, in step 501, use is by the quantity of the shared resource element of each eCCE of determining in the embodiment describing according to Fig. 2 or Fig. 3, when the quantity of the shared resource element of determined eCCE is during greater than or equal to Second Threshold, network entity determines that an eCCE occupies the eREG of the 3rd quantity, and determine the quantity of the resource element that average each eREG is shared, when the quantity of the shared resource element of determined eCCE is during lower than Second Threshold, network entity determines that an eCCE occupies the eREG of the 4th quantity, and determine the quantity of the resource element that average each eREG is shared.

Particularly, in this case, for the purpose of example, the eREG that the eREG of the 3rd quantity is set to 4, the four quantity is set to 2, and Second Threshold is set to 16.It may be noted that, those numerical value are only preferred, and nonrestrictive, also not fix.It will be understood by those of skill in the art that threshold value or the enforcement that do not affect scheme of the quantity of eREG of choosing other.By take the eREG that the eREG of the 3rd quantity is 2, the four quantity, be 4 below, Second Threshold is 16 as example, to discuss.

Particularly, when the quantity of the shared resource element of eCCE is for example 36, be greater than 16 due to 36, the quantity of eREG is set to 4, and the quantity of determining the shared resource element of average each eREG be 9 (by by 36 resource elements divided by 4 eREG).And when the quantity of the shared resource element of eCCE is for for example 15 time, the quantity of eREG is set to 2, and the quantity of determining the shared resource element of average each eREG is 7.5.

In sum, base station and subscriber equipment can be determined the quantity of eREG by step S501, and determine thus the quantity of the resource element that average each eREG is shared.

Then,, when the quantity of the shared resource element of average each eREG is integer, method enters step S502.In step S502, network entity is defined as the quantity of the shared resource element of average each eREG the quantity of the shared resource element of each eREG.The quantity for the shared resource element of eCCE is for example 36, and on average the quantity of the shared resource element of each eREG is 9 this situations, and the quantity of the shared resource element of 4 eREG is all defined as to 9,9,9,9.

When the quantity of the shared resource element of average each eREG is non-integer, need to judge whether base station and subscriber equipment be shared has the 4th pre-defined rule.When base station and subscriber equipment, share while having the 4th pre-defined rule, method enters step S503.Otherwise enter step 504.At this, it is pointed out that the 4th pre-defined rule herein can be identical with the 3rd pre-defined rule above, also can be different.

Particularly, similar with the step S404 in Fig. 4, for there being 4 eREG, and on average the quantity of the shared resource element of each eREG is 7.75 this situations, if base station and subscriber equipment are shared and had (predefine has) that the quantity of the resource element of 4 eREG is set to respectively to 8,8,8,7 these rules in advance, base station and subscriber equipment can be determined respectively the quantity of each the shared resource element in these 4 eREG according to this pre-defined rule.At this, this pre-defined rule is preferably the difference between the quantity that minimizes the shared resource element of each eREG.Certainly, at this, do not get rid of other applicable rules yet.This pre-defined rule that for example base station and subscriber equipment are shared can be also 9,8,7,7.

And do not share while having above-mentioned rule when base station and subscriber equipment, the quantity of the resource element that each eCCE is shared is determined in base station based on this pre-defined rule, determine 8,8,8,7, and send the 4th information to subscriber equipment, (this information for example can be passed through public search space (Common Searching Space to the quantity of the resource element that shared each eREG of the 4th information equipment for indicating user is shared, CSS) control information realizes or passes through high-level signaling, for example radio resource control signaling (Radio Resource Control, RRC) sends).Subsequently, subscriber equipment is determined the quantity of the resource element that its each shared eREG is shared based on the 4th information.

In the embodiment of another variation, when the quantity of the resource element that each eREG is shared is determined to be different from the rule of the 4th pre-defined rule in base station, for example, in above-mentioned example, when the quantity of the resource element of 4 eREG is set to respectively to 6,8,8,9 etc., subscriber equipment also can be told by above-mentioned configuration by the 4th information in base station, so that subscriber equipment carries out follow-up operation.Therefore,, by step S505, subscriber equipment has under the situation of pre-defined rule not having to share, and can receive from base station the 4th information, and determine accordingly the quantity of the shared resource element of its shared eREG.

In sum, in the step shown in Fig. 5, base station and subscriber equipment (network entity) can be distinguished implementation step S501, S502, S503 independently.Only, in step S504, need base station to send extra message and come to carry out alternately with subscriber equipment, thereby complete the configuration to eREG, to the eCCE configuration for ePDCCH.

Those skilled in the art will be understood that above-described embodiment is all exemplary and nonrestrictive.The different technologies feature occurring in different embodiment can combine, to obtain beneficial effect.Those skilled in the art, on the basis of research accompanying drawing, specification and claims, will be understood that and realize the embodiment of other variations of disclosed embodiment.For example, also can substitute predefined step, shared step by the relevant signaling of follow-up transmission, otherwise also can.

In claims, term " comprises " does not get rid of other devices or step; Indefinite article " one " is not got rid of a plurality of; Term " first ", " second " are for indicating title but not for representing any specific order.Any Reference numeral all should not be understood to the restriction to protection range.The function of a plurality of parts that occur in claim can be realized by an independent part.

Claims

1. in the network entity of communication system, be configured for a method of the eCCE of ePDCCH, wherein, said method comprising the steps of:

A. determine the quantity of the resource element that the quantity of eCCE of Physical Resource Block centering and each eCCE are shared.

2. method according to claim 1, is characterized in that, described step a further comprises:

A11. determine the quantity of the resource element that described Physical Resource Block centering can be used; And

A12. the quantity of the eCCE of described Physical Resource Block centering is defined as to 4, and the quantity of the eCCE based on determined Physical Resource Block centering is determined the quantity of the resource element that average each eCCE is shared; And

A13. when the quantity of the shared resource element of described average each eCCE is integer, the quantity of the shared resource element of described average each eCCE is defined as to the quantity of the shared resource element of each eCCE, when the quantity of the shared resource element of described average each eCCE is non-integer, execution step a13-1 or a13-2:

A13-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the first pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eCCE is shared based on described the first pre-defined rule;

A13-2. described network entity comprises base station and subscriber equipment, and when the first pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eCCE is shared is determined in described base station based on described the first pre-defined rule, and send the first information to described subscriber equipment, the described first information is indicated the quantity of the shared eCCE of described subscriber equipment and the shared resource element of this eCCE, and described subscriber equipment receives the described first information from described base station, and based on the described first information, determine the quantity of eCCE that it is shared and the shared resource element of this eCCE.

3. method according to claim 1, is characterized in that, described step a further comprises:

A21. determine the quantity of the resource element that described Physical Resource Block centering can be used;

A22. when the quantity of described available resource element is during greater than or equal to first threshold, determine the eCCE of the first quantity, and the eCCE based on described the first quantity determines the quantity of the resource element that average each eCCE is shared, when the quantity of described available resource element is during lower than described first threshold, determine the eCCE of the second quantity, and the eCCE based on described the second quantity determines the quantity of the resource element that average each eCCE is shared; And

A23. when the quantity of the shared resource element of described average each eCCE is integer, the quantity of the shared resource element of described average each eCCE is defined as to the quantity of the shared resource element of each eCCE; When the quantity of the shared resource element of described average each eCCE is non-integer, execution step a23-1 or a23-2:

A23-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the second pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eCCE is shared based on described the second pre-defined rule;

A23-2. described network entity comprises base station and subscriber equipment, and when the second pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eCCE is shared is determined in described base station based on described the second pre-defined rule, and send the second information to described subscriber equipment, described the second information is indicated the quantity of the shared eCCE of described subscriber equipment and the shared resource element of this eCCE, and described subscriber equipment receives described the second information from described base station, and based on described the second information, determine the quantity of eCCE that it is shared and the shared resource element of this eCCE.

4. according to the method in claim 2 or 3, it is characterized in that, described the first pre-defined rule and/or described the second pre-defined rule comprise the difference between the quantity that minimizes the shared resource element of each eCCE.

5. method according to claim 3, is characterized in that, the eCCE of described the first quantity is 4, and the eCCE of described the second quantity is 2.

6. method according to claim 3, is characterized in that, described first threshold is 72.

7. according to the method in claim 2 or 3, it is characterized in that, described method also comprises step b:

The quantity of the resource element that the quantity of the eREG that b. a definite eCCE occupies and each eREG are shared.

8. method according to claim 7, is characterized in that, described step b further comprises:

The quantity of the eREG that b 11. occupies an eCCE is defined as 4, and determines the quantity of the resource element that average each eREG is shared; And

B12. when the quantity of the shared resource element of described average each eREG is integer, the quantity of the shared resource element of described average each eREG is defined as to the quantity of the shared resource element of each eREG, when the quantity of the shared resource element of described average each eREG is non-integer, execution step b12-1 or b12-2:

B12-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the 3rd pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eREG is shared based on described the 3rd pre-defined rule;

B12-2. described network entity comprises base station and subscriber equipment, and when the 3rd pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eREG is shared is determined in described base station based on described the 3rd pre-defined rule, and send the 3rd information to described subscriber equipment, described the 3rd information is indicated the quantity of the shared resource element of each shared eREG of described subscriber equipment, and described subscriber equipment receives described the 3rd information from described base station, and based on described the 3rd information, determine the quantity of the resource element that its each shared eREG is shared.

9. method according to claim 7, is characterized in that, described step b further comprises:

B21. when the quantity of the shared resource element of determined eCCE is during greater than or equal to Second Threshold, determine that an eCCE occupies the eREG of the 3rd quantity, and determine the quantity of the resource element that average each eREG is shared, when the quantity of the shared resource element of determined eCCE is during lower than described Second Threshold, determine that an eCCE occupies the eREG of the 4th quantity, and determine the quantity of the resource element that average each eREG is shared; And

B22. when the quantity of the shared resource element of described average each eREG is integer, the quantity of the shared resource element of described average each eREG is defined as to the quantity of the shared resource element of each eREG, when the quantity of the shared resource element of described average each eREG is non-integer, execution step b22-1 or b22-2:

B22-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the 4th pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eREG is shared based on described the 4th pre-defined rule;

B22-2. described network entity comprises base station and subscriber equipment, and when the 4th pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eREG is shared is determined in described base station based on described the 4th pre-defined rule, and send the 4th information to described subscriber equipment, described the 4th information is indicated the quantity of the shared resource element of each shared eREG of described subscriber equipment, and described subscriber equipment receives described the 4th information from described base station, and based on described the 4th information, determine the quantity of the resource element that its each shared eREG is shared.

10. method according to claim 8 or claim 9, is characterized in that, described the 3rd pre-defined rule and/or described the 4th pre-defined rule comprise the difference between the quantity that minimizes the shared resource element of each eREG.

11. methods according to claim 9, is characterized in that, the eREG of described the 3rd quantity is 4, and the eREG of described the 4th quantity is 2.

12. methods according to claim 9, is characterized in that, described Second Threshold is 16.