Patent Abstract:
The present invention provides a method and device for allocating same resource for a plurality of eNBs of collaborative Multiple-input-Multiple-output (MIMO). Wherein a serving eNB firstly determines, in the one or more other eNBs, at least one candidate eNB recommended to cooperate with the serving eNB, according to measurement report reported by mobile stations or according to report information of the recommended candidate eNB reported by mobile station, then obtains resource related information of the at least one candidate eNB, then determines one or more collaborative eNBs from the at least one candidate eNB according to the resource related information, and allocates corresponding communication resources for the serving eNB and the one or more collaborative eNBs. The solution according to the present does not need to reserve special resource for collaborative MIMO, reduces waste of resource, and meets the requirement of resource for implementing collaborative MIMO by different serving eNBs flexibly, and increases the success rate of implementing collaborative MIMO.

Full Description:
FIELD OF THE INVENTION 
     The present invention relates to communication network, especially to wireless MEMO communication network. 
     BACKGROUND OF THE INVENTION 
     In IMT-advanced (International Mobile Telecommunications-Advanced), the collaborative MIMO (Multiple-Input-Multiple-Output) solution becomes an efficient method to improve the system coverage and spectral efficiency by using a plurality of eNBs (evolved Node B, hereinafter referred to as eNB) to provides one or more mobile stations (MS) with data service via cooperation among the plurality of eNBs to reduce the ICI (Inter-Cell Interference). To implement the collaborative MIMO transmission, same resource needs to be allocated for a plurality of eNBs performing, collaborative MIMO, that is, resource synchronization. 
     The so-called collaborative MIMO means that both eNB and MS have a plurality of antennas, at least a plurality of eNBs communicate with one MS, one eNB may communicate with one or more MSs. In collaborative MIMO, the serving eNB of one MS requests the neighboring cell eNB to participate in the collaborative MIMO transmission and indicates the resource allocated for this collaboration MEMO to the neighboring cell eNB requested to participate in the collaborative MIMO. If there is no conflict between the resource allocated for the neighboring cell eNB by the serving eNB and the resource of the neighboring cell eNB, then the collaborative MIMO transmission for this MS may be established. Referring to  FIG. 1 ,  FIG. 1  shows a schematic diagram of topology of traditional cellular cell, taking traditional hexagonal cell model as an example for illustration. Each MS has only one serving eNB, the serving eNB of MS is determined during the initial access of MS, MS may handover from original source serving eNB to a new object eNB with the movement of MS. MS  2   a  may be taken as a example to illustrate. The serving eNB of MS  2   a  is eNB  1   a , since network model is of hexagonal structure, one serving eNB at most has two neighboring cells which may participate in the collaborative MIMO with the serving eNB, the neighboring cell eNB performing the collaborative MIMO with the serving eNB and the serving eNB constitute one collaborative cell cluster. Certainly, in actual network, the serving eNB may have a plurality of neighboring eNBs (hereinafter referred to as neighboring cell eNB). As shown in  FIG. 1 , the dot oval frame denotes a collaborative cell cluster performing collaborative MIMO service for MS  2   a , constituted by the serving eNB  1   a , neighboring cell eNBs  1   b  and  1   c . In this collaborative cell cluster, the serving eNB  1   a  determines resource allocation for this collaborative MIMO transmission. 
     neighboring cell eNB  1   b  shown in  FIG. 1  may also be taken as a serving eNB in one collaborative cell cluster and determine MS (not shown in Fig) dominated by it, in this collaborative cell cluster. When each serving eNB allocates resource respectively, it is easy to cause resource conflict and result in CO-MIMO failure. 
     An existing resource allocation manner for CO-MIMO is shown in  FIG. 2 , the shadow with slash lines denotes the resource which may be used for CO-MIMO by eNB  1   a  as serving eNB, the blank area denotes the resource which may be used for CO-MIMO by eNB  1   b  as serving eNB, the shadow with vertical lines denotes the resource which may be used for CO-MIMO by eNB  1   c  as serving eNB, that is, each eNB reserves a part of fixed resource as resource area which may be allocated for collaborative MIMO while it acts as a serving eNB, and the reserved resource areas allocated for each serving eNB to be used for collaborative MIMO with other eNBs are all orthogonal to each other, that is, there is no overlapping part between any two resource areas, so as to guarantee there is no conflict of resources for collaborative MIMO. However, the efficiency of the resource allocation manner, which defining the resource allocation of serving eNB and collaborative eNB in a cell cluster for collaborative MIMO in a predetermined area, is very low. Its disadvantages are as follows:
         the reserved resource will be waste, If there is no MS or few MSs desiring collaborative MIMO communication.   if there are too many MSs desiring collaborative MIMO in one cell dominated by serving eNB, the reserved resource for this serving eNB will not meet the requirement of collaborative MIMO, so as to cause collaborative MIMO failure.   furthermore, that how to define the initial reserved resource area effectively in this predetermined fixed scheme is a problem.       

     SUMMARY OF THE INVENTION 
     In order to solve the aforesaid problems in the prior art, the present invention proposes: firstly, the serving eNB determines, in the one or more other eNBs, at least one candidate eNB recommended to cooperate with the serving eNB; then, obtains resource related information of the at least one candidate eNB; and then determines one or more collaborative eNBs from the at least one candidate eNB according to the resource related information, and allocates corresponding communication resources for the serving eNB and the one or more collaborative eNBs. 
     According to the first aspect of the present invention, there is provided a method, in a serving eNB of wireless communication network based on collaborative Multiple-Input-Multiple-Output, for allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, wherein the method comprises the following steps: determining, in the one or more other eNBs, at least one candidate eNB recommended to cooperate with the serving eNB; obtaining resource related information of the at least one candidate eNB; determining one or more collaborative eNBs from the at least one candidate eNB according to the resource related information, and allocating corresponding communication resources for the serving eNB and the one or more collaborative eNBs. 
     According to the second aspect of the present invention, there is provided a method, in a candidate eNB of wireless communication network based on collaborative Multiple-Input-Multiple-Output, for assisting a serving eNB in allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, wherein the method comprises the following step: sending resource related information to the serving eNB. 
     According to the third aspect of the present invention, there is provided a method, in a mobile station of wireless communication network based on collaborative Multiple-Input-Multiple-Output, for assisting a serving eNB in allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, wherein the method comprises the following steps: measuring signal quality related information between the mobile station and the serving eNB, and between the mobile station and one or more other eNBs; determining at least one candidate eNB recommended to cooperate with the serving eNB, according to the signal quality related information; generating candidate eNB indication information for indicating the at least one candidate eNB according to the at least one candidate eNB, and sending the candidate eNB indication information to the serving base station. 
     According to the fourth aspect of the present invention, there is provided a first collaborative device, in a serving eNB of wireless communication network based on collaborative Multiple-Input-Multiple-Output, for allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, wherein the device comprises: a means for determining candidate eNB, configured to determine, in the one or more other eNBs, at least one candidate eNB recommended to cooperate with the serving eNB; a means for obtaining resource information, configured to obtain resource related information of the at least one candidate eNB; a means for processing, configured to determine the one or more collaborative eNBs from the at least one candidate eNB according to the resource related information, and to allocate corresponding communication resources for the serving eNB and the one or more collaborative eNBs. 
     According to the fifth aspect of the present invention, there is provided a second collaborative device, in candidate eNB of wireless communication network based on collaborative Multiple-Input-Multiple-Output, for assisting a serving eNB in allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, wherein the device comprises: a means for sending resource information, configured to send resource related information to the serving eNB. 
     According to the sixth aspect of the present invention, there is provided An assisting device, in a mobile station of wireless communication network based on collaborative Multiple-Input-Multiple-Output, for assisting a serving eNB in allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, wherein the device comprises: a means for measurement, configured to measure signal quality related information between the mobile station and the serving eNB, and between the mobile station and one or more other eNBs; a means for recommendation, configured to determine at least one candidate eNB recommended to cooperate with the serving eNB, according to the signal quality related information; a means for sending, configured to generate candidate eNB indication information for indicating the at least one candidate eNB according to the at least one candidate eNB, and send the candidate eNB indication information to the serving base station. 
     The solution according to the present does not need to reserve special resource for collaborative MIMO, reduces waste of resource, and meets the demand for resource for implementing collaborative MIMO by different serving eNBs flexibly, and increases the success rate of implementing collaborative MIMO. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present invention will become apparent. 
         FIG. 1  shows a schematic diagram of topology of traditional cellular cell; 
         FIG. 2  shows an existing resource allocation manner; 
         FIG. 3  shows a flowchart of system method according to a detailed embodiment of the present invention; 
         FIG. 4  shows a flowchart of method of the step S 12  to the step S 15  according to another detailed embodiment of the present invention; 
         FIG. 5A  to  FIG. 5C  respectively shows three different scenarios of common available resource between serving eNB and candidate eNB; 
         FIG. 6  shows a block diagram a detailed embodiment present invention. 
     
    
    
     In drawings, same or similar reference signs refer to the same or similar device (module) or step. 
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Referring to  FIG. 1 , the network topology of the present invention is described as follows. MS  2   a  is taken as example for illustration. eNB  1   a  is the serving eNB of MS  2   a , furthermore, MS  2   a  may also receive signals from other neighboring eNBs, that is, neighboring cell eNBs of eNB  1   a , including eNB  1   b  and eNB  1   c . In LTE-Advanced system. eNB  1   a  interconnects with eNB  1   b  and eNB  1   c  via X2 interfaces. 
     Hereinafter, referring to  FIG. 3  and in combination with  FIG. 1 , flowchart of system method of the present invention is described as follows.  FIG. 3  shows a flowchart of system method according to a detailed embodiment of the present invention. 
     In step S 10 , the MS  2   a  measures signal quality related information between the MS  2   a  and the serving eNB  1   a , and between the MS  2   a  and each of other eNBs respectively. In this embodiment, signal quality related information is illustrated with signal strength. It may be understood that it is only exemplary here and signal quality related information is not limited to aforesaid contents and may be also RSSI (Received Signal Strength Indication), RSRP (Reference Signal Received Power), CQI (Channel Quality Indication) or CSI (Channel State Indication). 
     The MS  2   a  is located at cell edge area and may detect signal strength with the serving eNB  1   a  and signal strength with each of neighboring cell eNBs  1   b ,  1   c , and  1   d , for example, which are 110 dBm, 92 dBm, 85 dBm and 50 dBm respectively. 
     Then, in step S 11 , the MS  2   a  reports to eNB  1   a  signal quality related information with the serving eNB  1   a  and with each of a plurality of other eNBs. The signal quality related information comprises the type of the reported measurement value, which is RSSI in this embodiment, and further comprises the measured values. 
     Particularly, that when the MS  2   a  reports may be divided into the following two manners:
         event trigger:       

     in the phase of network entry, the MS  2   a  knows that it needs to report to the serving eNB  1   a  other eNBs whose signal strengths exceed a third predetermined threshold value and the signal strengths corresponding to these eNBs in order to perform collaborative MIMO among a plurality of eNBs. For example, the reported threshold pre-stored in the MS  2   a  is 80 dBm, that is, when the MS  2   a  detects that the signal strength corresponding to eNB exceeds 80 dBm, the MS  2   a  will report to the serving eNB  1   a  this eNB and the signal strength corresponding to this eNB. For example, when the MS  2   a  detects that the signal strengths with neighboring cell eNBs  1   b ,  1   c  and  1   d  are 92 dBm, 85 dBm and 50 dBm respectively, in order to reduce uplink signaling overhead and increase the reliability of collaborative MIMO, the MS  2   a  only reports to the serving eNB  1   a  the neighboring cell eNBs having good signal qualities, that is, the eNB whose signal strengths exceeds the third predetermined threshold, comprising: eNB  1   b  and eNB  1   c , and signal strength between the MS  2   a  and eNB  1   b , signal strength between the MS  2   a  and eNB  1   c . Therefore, the MS  2   a  reports to the serving eNB  1   a , the serving eNB  1   a  and other eNBs  1   b  and  1   c , whose signal strength with the MS  2   a  are 110 dBm 92 dBm and 85 dBm, respectively. 
     Or, in a varied embodiment, it may be specified that the MS  2   a  only reports the signal strength of the two neighboring cell eNBs whose measured signal strengths are the strongest. The aforesaid parameters are still taken as example, then the MS  2   a  reports to the serving eNB  1   a  signal strengths of the serving eNB  1   a  and the two neighboring cell eNBs whose signal strengths are the strongest, which are 110 dBm, 92 dBm and 85 dBm respectively. 
     Furthermore, alternatively, if the uplink signaling overhead of system is not considered, once the MS  2   a  detects signal from a neighboring cell eNB, it may report to the serving eNB  1   a  this neighboring cell eNB and signal strength corresponding to this neighboring cell eNB, that is, the MS  2   a  reports to the serving eNB  1   a  all of the detected signal strengths and eNBs corresponding to these detected signal strengths. For example, the MS  2   a  reports the signal strengths with the serving eNB  1   a  and eNBs  1   b ,  1   c , and  1   d , which are 110 dBm, 92 dBm 85 dBm and 50 dBm respectively.
         periodical trigger:       

     the MS  2   a  comprises timer for sending measurement report, when the timer reaches a predetermined time, it means that the MS  2   a  needs to report to the serving eNB  1   a  the detected signal quality related information of a plurality of other eNBs. For example, if the timer expires, the MS  2   a  reports to the serving eNB  1   a  the signal strengths between each of the serving eNB  1   a , other eNBs  1   b  and  1   c  and the MS  2   a , which are 110 dBm, 92 dBm and 85 dBm respectively; or the MS  2   a  reports the signal strengths with each of the serving eNB  1   a , eNBs  1   b ,  1   c  and  1   d , which are 110 dBm, 92 dBm 85 dBm and 50 dBm respectively. 
     Then, in step S 12 , the serving eNB  1   a  determines eNBs  1   b  and  1   c  as candidate eNBs according to signal quality related information reported by the MS  2   a.    
     Particularly, a first predetermined threshold value is pre-stored in the serving eNB  1   a , the first predetermined threshold value is used for selecting candidate eNB, desired by the serving eNB  1   a  to collaboratively process service of the MS  2   a  with this serving eNB  1   a , according to physical signal strength. When the serving eNB  1   a  selects candidate eNB, at least the magnitude of RSSI value is considered, moreover, the serving eNB  1   a  may also need to consider the difference value of signal strength between eNB  1   b  and eNB  1   c.    
     For example, the first predetermined threshold value pre-stored in the serving eNB  1   a  is 90 dBm, and a second predetermined threshold value is 10 dBm. The second predetermined threshold value is used for judging the difference level of signal strength among a plurality of other eNBs. 
     The aforesaid parameters are still taken as example. The serving eNB  1   a  firstly judges whether signal strength from other eNBs is higher than the first predetermined threshold value 90 dBm.
         if the signal strengths of both neighboring cell eNBs are higher than the first predetermined threshold value, then these two neighboring cell eNBs are both taken as candidate eNBs. For example, for the MS  2   b , as shown in  FIG. 1 , the MS  2   b  reports to the serving eNB  1   a  the signal strengths with each of the serving eNB  1   a , other eNBs  1   d  and  1   e . If the signal strengths between the MS  2   b  and each of neighboring cell eNBs  1   d  and  1   e , which are obtained by the serving eNB  1   a  and are from the report of the MS  2   b , are 95 dBm and 105 dBm respectively, both being higher than 90 dBm, then the serving eNB  1   a  takes both eNBs  1   d  and  1   e  as candidate eNBs.   if the signal strength value of only one eNB of two neighboring cell eNBs is higher than the first predetermined threshold value, and the difference value between signal strengths of the two neighboring cell eNBs is higher than the second predetermined threshold value, then the eNB whose signal strength is higher than the first predetermined threshold value is taken as candidate eNB. For example, for the MS  2   c , as shown in  FIG. 1 , the MS  2   c  reports to the serving eNB  1   a  the signal strengths with each of the serving eNB  1   a , other eNBs  1   b  and  1   g . If the signal strengths between the MS  2   c  and each of neighboring cell eNBs  1   b  and  1   g , which are obtained by the serving eNB  1   a  and are from the report of the MS  2   c , are 100 dBm and 80 dBm respectively, only 100 dBm being higher than 90 dBm, and the difference value of these two signal strengths is 20 dBm, higher than the second predetermined threshold value 10 dBm, then the serving eNB  1   a  only takes other eNBs  1   b  as candidate eNB.   if the signal strength value of only one eNB of two neighboring cell eNBs is higher than the first predetermined threshold value, and the difference value between signal strengths of the two neighboring cell eNBs is less than the second predetermined threshold value, then serving eNB takes both two neighboring cell eNBs as candidate eNBs. For example, for the MS  2   a , the MS  2   a  reports to the serving eNB  1   a  the signal strengths with each of the serving eNB  1   a , other eNBs  1   b  and  1   c . The signal strengths between the MS  2   a  and each of neighboring cell eNBs  1   b  and  1   c , which are obtained by the serving eNB  1   a  and are from the report of the MS  2   a , are 92 dBm and 85 dBm respectively, only 92 dBm being higher than 90 dBm, and the difference value of these two signal strengths is 7 dBm, less than the second predetermined threshold value 10 dBm, then the serving eNB  1   a  takes both other eNBs  1   b  and  1   c  as candidate eNBs. This practice broadens the limitation to signal strength of neighboring cell eNB, since the different value of respective signal strength of two neighboring cell eNBs is less the second predetermined threshold value, signal strengths are relative close to each other so that it will not cause the weaker signal to be submerged because one signal is too strong and the other is too weak.       

     Then, in step S 13 , the serving eNB  1   a  sends resource related information request message to eNB  1   b  and eNB  1   c.    
     In order to reduce redundant information interaction between the serving eNB  1   a  and other eNBs, the serving eNB  1   a  sends resource related information request message only to the candidate eNB selected by it. For example, the serving eNB  1   a  sends resource related information request message to the selected candidate eNBs  1   b  and  1   c . The resource related information request message is used for requesting the candidate eNBs  1   b  and  1   c  to send resource related information to the serving eNB  1   a . The serving eNB  1   a  interacts with other eNBs via X2 interfaces. 
     After candidate eNB receives the resource related information request message from the serving eNB  1   a , the method goes into step S 14 , eNBs  1   b  and  1   c  respectively send respective resource related information to the serving eNB  1   a . The serving eNB  1   a  may extract information related to available resource of eNBs  1   b  and  1   c  from the resource related information. 
     Certainly, there are at least two kinds of forms of resource related information: indication information of the occupied resource and indication information of the available resource. 
     Bit MAP is taken as example to illustrate resource related information. For example, the available bandwidth for each eNB is 5M, assuming multiplexing coefficient is 1, that is, each eNB may use the same frequency resource. For each eNB, for example, the allocation granularity of the bandwidth 5M is RB (Resource Block). In bit MAP, 0 denotes that the resource block is available namely idle, 1 denotes that the resource block is not available, that is, the resource block has already been allocated, or vice versa. And bit MAP is indexed to form pattern of resource related information. 
     For example, in respective resource related information which eNBs  1   b  and  1   c  respectively send to the serving eNB  1   a , the pattern of the resource related information of eNB  1   b  indicates that the resource blocks number  5  to number  33  of eNB  1   b  are not allocated and are still available, the pattern of the resource related information of eNB  1   c  indicates that the resource blocks numbers  17  to  40  of eNB  1   c  are available. 
     Then, in step S 15  the serving eNB  1   a  determines collaborative eNB among eNBs  1   b  and  1   c  according to resource related information of eNBs  1   b  and  1   c , and allocates corresponding communication resources. 
     In the following scenarios, several scenarios, in which there are common available resources among the serving eNB  1   a  and each of eNBs  1   b  and  1   c , are discussed respectively: 
     i) there is no common available resource either between the serving eNB and eNBs  1   b  or between the serving eNB  1   a  and eNBs  1   c:    
     for example, the available resources of the serving eNB  1   a  are the resource blocks number  45  to number  60 , the aforesaid parameters are still taken as example, that is, the available resources of eNB  1   b  are the resource blocks number  5  to number  33 , the available resources of eNB  1   c  are the resource blocks number  17  to number  40 . The available resources of the serving eNB  1   a  do not have intersection either with the available resources of eNB  1   b  or with the available resources of eNB  1   c . Therefore, the serving eNB  1   a  can not perform collaborative MIMO with neighboring cell eNB. Therefore, the method ends here, and the subsequent steps are not needed. 
     ii) there are same common available resources among the serving eNB  1   a , eNB  1   b  and eNB  1   c:    
     for example, the available resources of the serving eNB  1   a  are the resource blocks number  10  to number  25 , the aforesaid parameters are still taken as example, that is, the available resources of eNB  1   b  are the resource blocks number  5  to number  33 , the available resources of eNB  1   c  are the resource blocks number  17  to number  40 . The resource blocks number  17  to number  25  are the same common available resources among the serving eNB  1   a  and eNB  1   b  and eNB  1   c . Therefore, the serving eNB  1   a  takes both eNB  1   b  and eNB  1   c  as collaborative eNBs for collaborative MIMO and allocates resources in the resource blocks number  17  to number  25  for eNB  1   b  and eNB  1   c.    
     iii) there are respectively common available resources between the serving eNB  1   a  and eNB  1   b  and between the serving eNB  1   a  and eNB  1   c , but the common available resources between the serving eNB  1   a  and eNB  1   b  does not have intersection with the common available resources between the serving eNB  1   a  and eNB  1   c:    
     for example, the available resources of the serving eNB  1   a  are the resource blocks number  10  to number  25  and the resource blocks number  50  to number  64 , the available resources of eNB  1   b  are the resource blocks number  15  to number  45 , the available resources of eNB  1   c  are the resource blocks number  40  to number  60 . Therefore, the resource blocks number  15  to number  25  are the common available resources between the serving eNB  1   a  and eNB  1   b , the resource blocks number  50  to number  60  are the common available resources between the serving eNB  1   a  and eNB  1   c , these two common available resources do not have intersection between each other. Now, the serving eNB  1   a  further selects the one with better signal quality as collaborative eNB according to signal qualities of the two candidate eNBs. For example, the signal strength between eNB  1   b  and the MS  2   a  is 92 dBm, the signal strength between eNB  1   c  and the MS  2   a  is 85 dBm. Since the signal strength between eNB  1   b  and the MS  2   a  is higher than the signal strength between eNB  1   c  and the MS  2   a , the serving eNB  1   a  selects eNB  1   b  as collaborative eNB. 
     Then, the serving eNB  1   a  determines corresponding MCS (Modulation and Coding Scheme) according to QoS (Quality of Service) of the service requested by the MS  2   a , and allocates a part or all of common available resources for the serving eNB  1   a  and the determined collaborative eNB according to the MCS, granularity of resource allocation, single allocation or allocation in pairs, to perform collaborative MIMO. For example, the scenario i) is taken as example, the serving eNB  1   a  allocates the resource blocks number  18  to number  21  of the resource blocks number  17  to number  25  for the serving eNB  1   a , eNB  1   b  and eNB  1   c , so that the serving eNB  1   a , eNB  1   b  and eNB  1   c  perform collaborative MIMO on the same resource blocks number  18  to number  21 , and sends collaborative MIMO request to eNB  1   b  and eNB lc, which comprises the sequence number  18 - 21  of the resource blocks for collaborative MIMO, allocated for eNB  1   b  and eNB  1   c  by the serving eNB  1   a.    
     In a varied embodiment, prior to the step S 11 , the method further comprises the following step, the serving eNB  1   a  sends to the MS  2   a  measurement control message for requesting measurement report, the measurement control message comprises the type of the desired MS measurement and the threshold value of the reported measurement value. Then, in the step S 12 , the MS  2   a  measures and reports according to the measurement control message received from the serving eNB  1   a.    
     In aforesaid embodiment, in the step S 11 , the serving eNB  1   a  obtains the measurement report reported by the MS  2   a , the measurement report comprises not only the signal quality between the MS  2   a  and the serving eNB  1   a  but also the signal quality between the MS  2   a  and other eNBs. In a varied embodiment, for example, for TDD system, the serving eNB  1   a  may measure via uplink sounding signal and obtain corresponding downlink signal quality from uplink signal quality according to the reciprocity of TDD system, therefore, the serving eNB  1   a  may measure signal quality with the MS  2   a  by itself and receive signal quality related information between this MS and other eNB, reported by the MS  2   a . That is, the MS  2   a  does not need to report to its serving eNB  1   a  the signal quality related information between the MS  2   a  and the serving eNB  1   a.    
     In aforesaid embodiment, existing measurement control and measurement report between each MS and serving eNB may be reused. In a varied embodiment, considering that MS develops towards the trend of more intelligent, its computing speed and process capability are higher and higher. Therefore, a kind of new signaling may be defined, or a kind of new measurement type is defined in measurement types, so the step S 12  may be finished by MS, that is, the MS  2   a  judges that which neighboring cell eNBs are selected as candidate eNBs according to measurement results with the serving eNB  1   a  and neighboring eNBs (for example, eNB  1   b , eNB  1   c ), measured by itself, and generates corresponding candidate eNB indication information and sends the candidate eNB indication information to serving eNB. The detailed judging process is described in aforesaid step S 12  in details, it is not necessary to repeat again. Then in step S 13 , the serving eNB  1   a  sends resource related information request message to corresponding candidate eNB according to candidate eNB indication information from the MS  2   a.    
     In the step S 13  of aforesaid embodiment, that the serving eNB  1   a  sends resource related information request message to eNB  1   b  and eNB  1   c  is for the purpose of reducing signaling overhead between eNB and eNB. Without considering signaling overhead, the step S 13  may be omitted, for example, neighboring eNBs may report their resource related information to the serving eNB  1   a  periodically, and it is not necessary for neighboring eNBs to trigger the report upon receiving the request message from the serving eNB  1   a.    
     In aforesaid embodiment, the scenario in which the MS  2   a  reports to the serving eNB  1   a  the signal strengths between the MS  2   a  and each of two neighboring cell eNBs, is taken as example for illustration. In a varied embodiment, the MS  2   b  is taken as example, for example, the MS  2   b  reports to the serving eNB  1   a  the signal strengths between the MS  2   a  and each of a plurality of neighboring cell eNBs, which comprise eNB  1   d , eNB  1   e  and eNB  1   b .  FIG. 4  shows a method flowchart from step S 12  to step S 15  performed by the serving eNB  1   a , taking the MS  2   b  as a detailed embodiment. Hereinafter, in combination with  FIG. 4 , the flowchart is described as follows: 
     In step S 120 , firstly, the serving eNB  1   a  judges whether the signal strength between each of three neighboring cell eNBs and the MS  2   b  is higher than the first predetermined threshold.
         if the judging result of the serving eNB  1   a  is that the signal strength between each of three neighboring cell eNBs and the MS  2   b  is higher than the first predetermined threshold, then the method goes into the step S 122 ′, the serving eNB  1   a  takes all of three neighboring eNBs  1   b ,  1   d  and  1   e  as candidate eNBs for collaborative MIMO;   if the judging result of the serving eNB  1   a  is that not all the signal strengths from the three neighboring cell eNBs are higher than the first predetermined threshold, for example, the signal strength from eNB  1   b  is less than the first predetermined threshold, but the signal strengths from eNB  1   d  and eNB  1   e  are higher than the first predetermined threshold, then the method goes into the step S 121 , the serving eNB  1   a  judges whether the difference value between the signal strength of the one that is less than the first predetermined threshold, and the signal strength of the minimal in these signal strengths which are higher than the first predetermined threshold, is higher than the second predetermined threshold. For example, the first predetermined threshold is 90 dBm, and the second predetermined threshold is 10 dBm. The signal strengths from eNB  1   d  and eNB  1   e  are respectively 100 dBm and 92 dBm, and the signal strength from eNB  1   b  is 88 dBm. The serving eNB  1   a  firstly judges that the signal strengths from eNB  1   d  and eNB  1   c  are higher than the first predetermined threshold, but the signal strength from eNB  1   b  is less than the first predetermined threshold, thus the serving eNB  1   a  firstly takes eNBs  1   d  and  1   e  as candidate eNBs, then the method goes into the step S 121 , the serving eNB  1   a  further compares the difference value between the signal quality from eNB  1   b  and the signal quality from eNB  1   e , the serving eNB finds that the difference value of the signal quality from eNB  1   e  92 dBm minus the signal quality from eNB  1   b  88 dBm is less than the second predetermined threshold, thus the serving eNB  1   a  also takes eNBs  1   b  as candidate eNB;   if the first predetermined threshold is 90 dBm, and the second predetermined threshold is 10 dBm, the signal strengths from eNB  1   d  and eNB  1   e  are respectively 100 dBm and 95 dBm, and the signal strength from eNB  1   b  is 80 dBm. Then in the step S 121 , the judging result of the serving eNB  1   a  is the difference value of the signal strength between eNB  1   b  and MS, and the signal strength between eNB  1   e  and MS is higher than the second predetermined threshold, thus in the step S 122 , the serving eNB  1   a  only takes the two neighboring cell eNBs  1   d  and  1   e  as candidate eNBs for collaborative MIMO;   furthermore, if the signal quality of only one eNB is higher than the first predetermined threshold, for example, only the signal quality of eNB  1   d  is higher than the first predetermined threshold, and the difference value of signal quality between eNB  1   b  and eNB  1   d , and the difference value of signal quality between eNB  1   e  and eNB  1   d  are both higher than the second predetermined threshold, then the judging result of the serving eNB  1   a  is that only eNB  1   d  is taken as candidate eNB for collaborative MIMO.       

     Then, in step S 13 , the serving eNB  1   a  sends resource related information request message to the selected candidate eNB; then, in step S 14 , the serving eNB obtains resource related information from each candidate eNB. 
     Then, in step S 150 , the serving, eNB  1   a  judges whether the available resources from each candidate eNB overlaps the available resources of the serving eNB  1   a.    
     Since the scenario with two candidate eNBs is discussed hereinbefore, it is not necessary to repeat again. Hereinafter, the scenario with three candidate eNBs, for example, eNBs  1   b ,  1   d  and  1   e , will be discussed, the available resources of each of three candidate eNBs may have common parts with the available resources of the serving eNB  1   a  or may not.
         if the available resources of each of three candidate eNBs are not same with the available resources of the serving eNB  1   a , that is, the available resources of each of three candidate eNBs do not overlap the available resources of the serving eNB  1   a , then the method goes into step S 153 ″, the serving eNB  1   a  judges that all of three candidate eNBs can not cooperate with the serving eNB to perform CO-MIMO;   if the available resources of each of three candidate eNBs has common parts with the available resources of the serving eNB  1   a , then in the step S 151 , the serving eNB  1   a  continues to judge whether there are suitable common available resources, for example, judge whether the common available resources of a plurality of candidate eNBs and the serving eNB  1   a  are partly same or identical. If the common available resources of candidate eNBs and serving eNB are shown as  FIG. 5A , the same common available resources is denoted by the shadow with slash lines, then the serving eNB  1   a  judges to go into step S 153 , all of the three candidate eNBs may cooperate with the serving eNB  1   a  for collaborative MIMO on the same common available resources, and the serving eNB  1   a  accordingly allocates a part or all of resources corresponding to the shadow with slash lines for the serving eNB  1   a  and other eNBs  1   b ,  1   d  and  1   e ; if, for example, the common available resources between two candidate eNBs and serving eNB have overlapping parts, but there is no common available resource between another candidate eNB and serving eNB, then similarly, a part or all of the overlapping common available resources between the two candidate eNBs and the serving eNB are taken as resources for CO-MIMO;   if there are common available resources between each of a plurality of candidate eNBs and the serving eNB  1   a  respectively, and there is no common available resource between every two of the plurality of candidate eNBs, a candidate eNB whose signal quality with the MS is the best among the plurality of candidate eNBs is selected as collaborative eNB to cooperate with the serving eNB to serve the MS, according to the signal quality of each candidate eNB.  FIG. 5B  is taken as example, each of candidate eNB  1   e  and  1   b  has common available resources with the serving eNB  1   a , but there is no same part between the two common available resources, then in step S  153 ′, the serving eNB  1   a  selects a candidate eNB whose signal quality with the MS  2   b  is the best among candidate eNBs as collaborative eNB to cooperate with the serving eNB  1   a . For example, the signal strength between eNB  1   e  and the MS  2   b  is 95 dBm and the signal strength between eNB  1   b  and the MS  2   b  is 88 dBm, then the serving eNB  1   a  selects eNB  1   c  as collaborative eNB, and selects a part or all of the common available resource, as shown by the shadow with transverse line in  FIG. 5B , for the serving eNB  1   a  and collaborative eNB  1   e  to perform CO-MIMO;   if there are common available resources between not all of candidate eNBs  1   b ,  1   d  and  1   e , and the serving eNB  1   a , for example, as shown in  FIG. 5C , candidate eNBs  1   d  and  1   b  have common available resources with the serving eNB  1   a , as shown by the shadow with slash lines, and candidate eNB  1   e  has common available resources with the serving eNB  1   a , as shown by the shadow with transverse lines, and these two common available resources have no intersection with each other, then in the step S 153 ′ the serving eNB  1   a  takes each candidate eNB, corresponding to common available resources available for allocation for the maximum number of candidate eNBs and for the serving eNB, as collaborative eNB to cooperate with the serving eNB 1   a  to serve the MS  2   b , that is, as shown in  FIG. 5C , the serving eNB  1   a  takes eNBs  1   d  and  1   b  as collaborative eNBs, and allocates the resources for CO-MIMO for the serving eNB  1   a , collaborative eNB  1   b  and collaborative eNB  1   d  according to corresponding common available resources shown by the shadow with slash lines.       

     It may be understood that the above-mentioned values of the first predetermined threshold, the second predetermined threshold and the third predetermined threshold are only exemplary, those skilled in the art may select suitable threshold values according to actual engineering requirement such as different network configuration. Furthermore, the values of signals in each embodiment are also only exemplary. 
     Hereinbefore, the embodiments of the present invention are described in detail from the aspect of method; hereinafter, the embodiments of the present invention are described in detail from the aspect of device.  FIG. 6  shows a block diagram of device of a detailed embodiment of the present invention. 
     Wherein, a first collaborative device  1  of serving eNB  1   a , for allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, comprises a means  10  for determining candidate eNB, a means  11  for requesting, a means  12  for obtaining resource information and a means  13  for processing. Wherein, the means  10  for determining candidate eNB further comprises a means  100  for obtaining signal quality, the means  13  for processing further comprises a means  130  for resource judging and a means  131  for resource allocation. 
     An assisting device  2  of the MS  2   a , for assisting a serving eNB in allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, comprises a means  20  for measurement, a means  21  for sending. 
     A second collaborative device  3  of the candidate eNBs  1   b ,  1   c , for assisting the serving eNB in allocating communication resources for the serving eNB and one or more collaborative eNBs that collaboratively process mobile station service, comprises: a means  30  for receiving request, a means  31  for sending resource information, a means  32  for obtaining indication and a means  33  for communication. 
     The means  20  for measurement of the assisting device  2  of the MS  2   a  measures signal quality related information between the MS  2   a  and the serving eNB  1   a , and between the MS  2   a  and each of other eNBs respectively. In this embodiment, signal quality related information is illustrated with signal strength. It may be understood that it is only exemplary here and signal quality related information is not limited to aforesaid contents and may be also RSSI (Received Signal Strength Indication), RSRP (Reference Signal Received Power), CQI (Channel Quality Indication) or CSI (Channel State Indication). 
     The MS  2   a  is located at cell edge area, the means  20  for measurement may detect signal strength with the serving eNB  1   a  and signal strength with each of neighboring cell eNBs  1   b ,  1   c , and  1   d , for example, which are 110 dBm, 92 dBm, 85 dBm and 50 dBm respectively. 
     Then, the means  21  for sending reports to the means  100  for obtaining signal quality of the eNB  1   a  signal quality related information with the serving eNB  1   a  and with each of a plurality of other eNBs. The signal quality related information comprises the type of the reported measurement value, which is RSSI in this embodiment, and further comprises the measured values. 
     Particularly, that when the MS  2   a  reports may be divided into the following two manners of:
         event trigger:       

     in the phase of network entry, the MS  2   a  knows that it needs to report to the means  100  for obtaining signal quality of the serving eNB  1   a  other eNBs whose signal strengths exceed a third predetermined threshold value and the signal strengths corresponding to these eNBs in order to perform collaborative MIMO among a plurality of eNBs. For example, the reported threshold pre-stored in the MS  2   a  is 80 dBm, that is, when the means  20  for measurement detects that the signal strength corresponding to eNB exceeds 80 dBm, the means  20  for measurement will report to the serving eNB  1   a  this eNB and the signal strength corresponding to this eNB. For example, when the means  20  for measurement detects that the signal strengths with neighboring cell eNBs  1   b ,  1   c  and  1   d  are 92 dBm, 85 dBm and 50 dBm respectively, in order to reduce uplink signaling overhead and increase the reliability of collaborative MIMO, the means  21  for sending only reports to the serving eNB  1   a  the neighboring cell eNBs having good signal qualities, that is, the eNB whose signal strengths exceeds the third predetermined threshold, comprising: eNB  1   b  and eNB  1   c , and signal strength between the MS  2   a  and eNB  1   b , signal strength between the MS  2   a  and eNB  1   c . Therefore, the means  21  for sending reports to the serving eNB  1   a , the serving eNB  1   a  and other eNBs  1   b  and  1   c , whose signal strength with the MS  2   a  are 110 dBm 92 dBm and 85 dBm, respectively. 
     Or, in a varied embodiment, it may be specified that the MS  2   a  only reports the signal strength of the two neighboring cell eNBs whose measured signal strengths are the strongest. The aforesaid parameters are still taken as example, then the means  21  for sending reports to the serving eNB  1   a  signal strengths of the serving eNB  1   a  and the two neighboring cell eNBs whose signal strengths are the strongest, which are 110 dBm, 92 dBm and 85 dBm respectively. 
     Furthermore, alternatively, if the uplink signaling overhead of system is not considered, once the MS  2   a  detects signal from a neighboring cell eNB, it may report to the serving eNB  1   a  this neighboring cell eNB and signal strength corresponding to this neighboring cell eNB, that is, the MS  2   a  reports to the serving eNB  1   a  all of the detected signal strengths and eNBs corresponding to these detected signal strengths. For example, the MS  2   a  reports the signal strengths with the serving eNB  1   a  and eNBs  1   b ,  1   c , and  1   d , which are 110 dBm, 92 dBm 85 dBm and 50 dBm respectively.
         periodical trigger:       

     the MS  2   a  comprises timer for sending measurement report, when the timer reaches a predetermined time, it means that the MS  2   a  needs to report to the means  100  for obtaining signal quality of the serving eNB  1   a  the detected signal quality related information of a plurality of other eNBs. For example, if the timer expires, the means  21  for sending reports to the means  100  for obtaining signal quality of the serving eNB  1   a  the signal strengths between each of the serving eNB  1   a , other eNBs  1   b  and  1   c  and the MS  2   a , which are 110 dBm, 92 dBm and 85 dBm respectively; or the means  21  for sending reports the signal strengths with each of the serving eNB  1   a , eNBs  1   b ,  1   c  and  1   d , which are 110 dBm, 92 dBm 85 dBm and 50 dBm respectively. 
     The means  10  for determining candidate eNB, of the first collaborative device  1  of the serving eNB  1   a , determines eNBs  1   b  and  1   c  as candidate eNBs according to signal quality related information reported by the MS  2   a.    
     Particularly, a first predetermined threshold value is pre-stored in the means  10  for determining candidate eNB, the first predetermined threshold value is used for selecting candidate eNB, desired by the serving eNB  1   a  to collaboratively process service of the MS  2   a  with this serving eNB  1   a , according to physical signal strength. When the means  10  for determining candidate eNB selects candidate eNB, at least the magnitude of RSSI value is considered, moreover, the means  10  for determining candidate eNB may also need to consider the difference value of signal strength between eNB  1   b  and eNB  1   c.    
     For example, the first predetermined threshold value pre-stored in the means  10  for determining candidate eNB is 90 dBm, and a second predetermined threshold value is 10 dBm. The second predetermined threshold value is used for judging the difference level of signal strength among a plurality of other eNBs. 
     The aforesaid parameters are still taken as example. The means  10  for determining candidate eNB firstly judges whether signal strength from other eNBs is higher than the first predetermined threshold value 90 dBm.
         if the signal strengths of both neighboring cell eNBs are higher than the first predetermined threshold value, then these two neighboring cell eNBs are both taken as candidate eNBs. For example, for the MS  2   b , as shown in  FIG. 1 , the MS  2   b  reports to the serving eNB  1   a  the signal strengths with each of the serving eNB  1   a , other eNBs  1   d  and  1   e . If the signal strengths between the MS  2   b  and each of neighboring cell eNBs  1   d  and  1   e , which are obtained by the means  100  for obtaining signal quality and are from the report of the MS  2   b , are 95 dBm and 105 dBm respectively, both being higher than 90 dBm, then the means  10  for determining candidate eNB takes both eNBs  1   d  and  1   e  as candidate eNBs.   if the signal strength value of only one eNB of two neighboring cell eNBs is higher than the first predetermined threshold value, and the difference value between signal strengths of the two neighboring cell eNBs is higher than the second predetermined threshold value, then the means  10  for determining candidate eNB only takes the eNB, whose signal strength is higher than the first predetermined threshold value, as candidate eNB. For example, for the MS  2   c , as shown in  FIG. 1 , the MS  2   c  reports to the serving eNB  1   a  the signal strengths with each of the serving eNB  1   a , other eNBs  1   b  and  1   g . If the signal strengths between the MS  2   c  and each of neighboring cell eNBs  1   b  and  1   g , which are obtained by the means  100  for obtaining signal quality and are from the report of the MS  2   c , are 100 dBm and 80 dBm respectively, only 100 dBm being higher than 90 dBm, and the difference value of these two signal strengths is 20 dBm, higher than the second predetermined threshold value 10 dBm, then the means  10  for determining candidate eNB only takes other eNBs  1   b  as candidate eNB.   if the signal strength value of only one eNB of two neighboring cell eNBs is higher than the first predetermined threshold value, and the difference value between signal strengths of the two neighboring cell eNBs is less than the second predetermined threshold value, then the means  10  for determining candidate eNB takes both two neighboring cell eNBs as candidate eNBs. For example, for the MS  2   a , the MS  2   a  reports to the serving eNB  1   a  the signal strengths with each of the serving eNB  1   a , other eNBs  1   b  and  1   c . The signal strengths between the MS  2   a  and each of neighboring cell eNBs  1   b  and  1   c , which are obtained by the means  100  for obtaining signal quality and are from the report of the MS  2   a , are 92 dBm and 85 dBm respectively, only 92 dBm being higher than 90 dBm, and the difference value of these two signal strengths is 7 dBm, less than the second predetermined threshold value 10 dBm, then the means  10  for determining candidate eNB takes both other eNBs  1   b  and  1   c  as candidate eNBs. This practice broadens the limitation to signal strength of neighboring cell eNB, since the different value of respective signal strength of two neighboring cell eNBs is less the second predetermined threshold value, signal strengths are relative close to each other so that it will not cause the weaker signal to be submerged because one signal is too strong and the other is too weak.       

     Then, the means  11  for requesting sends resource related information request message to eNB  1   b  and eNB  1   c.    
     In order to reduce redundant information interaction between the serving eNB  1   a  and other eNBs, the means  11  for requesting sends resource related information request message only to the candidate eNB selected by it. For example, the means  11  for requesting sends resource related information request message to the selected candidate eNBs  1   b  and  1   c . The resource related information request message is used for requesting the candidate eNBs  1   b  and  1   c  to send resource related information to the serving eNB  1   a . The means  11  for requesting interacts with other eNBs via X2 interfaces. 
     After the means  30  for receiving request of the second collaborative device  3  of the candidate eNBs  1   b ,  1   c  receives the resource related information request message from the serving eNB  1   a , their means  31  for sending resource information respectively send respective resource related information to the serving eNB  1   a . The means  12  for obtaining resource information, of the serving eNB  1   a , may extract information related to available resource of eNBs  1   b  and  1   c  from the resource related information. 
     Certainly, there are at least two kinds of forms of resource related information: indication information of the occupied resource and indication information of the available resource. 
     Bit MAP is taken as example to illustrate resource related information. For example, the available bandwidth for each eNB is 5M, assuming multiplexing coefficient is 1, that is, each eNB may use the same frequency resource. For each eNB, for example, the allocation granularity of bandwidth 5M is RB (Resource Block). In hit MAP, 0 denotes that the resource block is available namely idle, 1 denotes that the resource block is not available, that is, the resource block has already been allocated, or vice versa. And bit MAP is indexed to form pattern of resource related information. 
     For example, in respective resource related information which eNBs  1   b  and  1   c  respectively send to the serving eNB  1   a , the pattern of the resource related information of eNB  1   b  indicates that the resource blocks number  5  to number  33  of eNB  1   b  are not allocated and are still available, the pattern of the resource related information of eNB  1   c  indicates that the resource blocks numbers  17  to  40  of eNB  1   c  are available. 
     The means  13  for processing of the first collaborative device  1  determines collaborative eNB among eNBs  1   b  and  1   c  according to resource related information of eNBs  1   b  and  1   c , and allocates corresponding communication resources. 
     In the following scenarios, several judging scenarios judged by the means  130  for resource judging, in which there are common available resources among the serving eNB  1   a  and each of eNBs  1   b  and  1   c , are discussed respectively: 
     i) there is no common available resource either between the serving eNB  1   a  and eNBs  1   b  or between the serving eNB  1   a  and eNBs  1   c:    
     for example, the available resources of the serving eNB  1   a  are the resource blocks number  45  to number  60 , the aforesaid parameters are still taken as example, that is, the available resources of eNB  1   b  are the resource blocks number  5  to number  33 , the available resources of eNB  1   c  are the resource blocks number  17  to number  40 . The available resources of the serving eNB  1   a  do not have intersection either with the available resources of eNB  1   b  or with the available resources of eNB  1   c . Therefore, the serving eNB  1   a  can not perform collaborative MIMO with neighboring cell eNB. 
     ii) there are same common available resources among the serving eNB  1   a , eNB  1   b  and eNB  1   c:    
     for example, the available resources of the serving eNB  1   a  are the resource blocks number  10  to number  25 , the aforesaid parameters are still taken as example, that is, the available resources of eNB  1   b  are the resource blocks number  5  to number  33 , the available resources of eNB  1   c  are the resource blocks number  17  to number  40 . The resource blocks number  17  to number  25  are the same common available resources among the serving eNB  1   a  and eNB  1   b  and eNB  1   c . Therefore, the means  13  for processing takes both eNB  1   b  and eNB  1   c  as collaborative eNBs for collaborative MIMO, and the means  131  for resource allocation of the means  13  for processing allocates resources in the resource blocks number  17  to number  25  for eNB  1   b  and eNB  1   c.    
     iii) there are respectively common available resources between the serving eNB  1   a  and eNB  1   b  and between the serving eNB  1   a  and eNB  1   c , but the common available resources between the serving eNB  1   a  and eNB  1   b  does not have intersection with the common available resources between the serving eNB  1   a  and eNB  1   c:    
     for example, the available resources of the serving eNB  1   a  are the resource blocks number  10  to number  25  and the resource blocks number  50  to number  64 , the available resources of eNB  1   b  are the resource blocks number  15  to number  45 , the available resources of eNB  1   c  are the resource blocks number  40  to number  60 . Therefore, the resource blocks number  15  to number  25  are the common available resources between the serving eNB  1   a  and eNB  1   b , the resource blocks number  50  to number  60  are the common available resources between the serving eNB  1   a  and eNB  1   c , these two common available resources do not have intersection between each other. Now, the serving eNB  1   a  further selects the one with better signal quality as collaborative eNB according to signal qualities of the two candidate eNBs. For example, the signal strength between eNB  1   b  and the MS  2   a  is 92 dBm, the signal strength between eNB  1   c  and the MS  2   a  is 85 dBm. Since the signal strength between eNB  1   b  and the MS  2   a  is higher than the signal strength between eNB  1   c  and the MS  2   a , the means  13  for processing selects eNB  1   b  as collaborative eNB. 
     Then, the serving eNB  1   a  determines corresponding MCS (Modulation and Coding Scheme) according to QoS (Quality of Service) of the service requested by the MS  2   a , and allocates a part or all of common available resources for the serving eNB  1   a  and the determined collaborative eNB according to the MCS, granularity of resource allocation, single allocation or allocation in pairs, to perform collaborative MIMO. For example, the scenario i) is taken as example, the means  131  for resource allocation allocates the resource blocks number  18  to number  21  of the resource blocks number  17  to number  25  for the serving eNB  1   a , eNB  1   b  and eNB  1   c , so that the serving eNB  1   a , eNB  1   b  and eNB  1   c  perform collaborative MIMO on the same resource blocks number  18  to number  21 , and sends collaborative MIMO request to eNB  1   b  and eNB  1   c , which comprises the sequence number  18 - 21  of the resource blocks for collaborative MIMO, allocated for eNB  1   b  and eNB  1   c  by the serving eNB  1   a.    
     Then, the means  32  for obtaining indication, of the second collaborative device  3 , obtains resource allocation indication message from the first collaborative device, the resource allocation indication message is used for indicating this candidate eNB as collaborative eNB and indicating corresponding communication resource allocated for the collaborative eNB; and the means  33  for communication, determines this candidate eNB as collaborative eNB to cooperate with the serving eNB to serve the MS  2   a , according to the resource allocation indication message obtained by the means  32  for obtaining indication, and cooperates with the serving eNB to serve the MS with the corresponding communication resource. 
     In a varied embodiment, the first collaborative device  1  sends to the MS  2   a  measurement control message for requesting measurement report, the measurement control message comprises the type of the desired MS measurement and the threshold value of the reported measurement value. Then, the means  20  for measurement of the MS  2   a  measures and reports according to the measurement control message received from the serving eNB  1   a.    
     In aforesaid embodiment, the means  10  for determining candidate eNB of the serving eNB  1   a  obtains the measurement report reported by the MS  2   a , the measurement report comprises not only the signal quality between the MS  2   a  and the serving eNB  1   a  but also the signal quality between the MS  2   a  and other eNBs. In a varied embodiment, for example, for TDD system, the serving eNB  1   a  may measure via uplink sounding signal and obtain corresponding downlink signal quality from uplink signal quality according to the reciprocity of TDD system, therefore, the serving eNB  1   a  may measure signal quality with the MS  2   a  by itself and receive signal quality related information between this MS and other eNB, reported by the MS  2   a . That is, the MS  2   a  does not need to report to its serving eNB  1   a  the signal quality related information between the MS  2   a  and the serving eNB  1   a.    
     In aforesaid embodiment, existing measurement control and measurement report between each MS and serving eNB may be reused. In a varied embodiment, considering that MS develops towards the trend of more intelligent, its computing speed and process capability are higher and higher. Therefore, a kind of new signaling may be defined, or a kind of new measurement type is defined in measurement types, so the MS comprises a means for recommendation (not shown in Fig), for judging that which neighboring cell eNBs are selected as candidate eNBs according to measurement results with the serving eNB  1   a  and neighboring eNBs (for example, eNB  1   b , eNB  1   c ), measured by itself, and generating corresponding candidate eNB indication information and sends the candidate eNB indication information to the means  10  for determining candidate eNB of the first collaborative device  1 . The detailed judging process is described in details hereinbefore, it is not necessary to repeat again. Then, the means  12  for obtaining resource information of the eNB sends resource related information request message to corresponding candidate eNB according to candidate eNB indication information from the MS  2   a.    
     That the means  11  for requesting sends resource related information request message to eNB  1   b  and eNB  1   c  is for the purpose of reducing signaling overhead between eNB and eNB. Without considering signaling overhead, the means  11  for requesting may be omitted, example, neighboring eNBs may report their resource related information to the means  12  for obtaining resource information of the serving eNB  1   a  periodically, and it is not necessary for neighboring eNBs to trigger the report upon receiving the request message from the means  11  for requesting. 
     In aforesaid embodiment, the scenario in which the MS  2   a  reports to the serving eNB  1   a  the signal strengths between the MS  2   a  and each of two neighboring cell eNBs, is taken as example for illustration. In a varied embodiment, the MS  2   b  is taken as example, for example, the MS  2   b  reports to the serving eNB  1   a  the signal strengths between the MS  2   a  and each of a plurality of neighboring cell eNBs, which comprise eNB  1   d , eNB  1   e  and eNB  1   b . Hereinafter, the first collaborative device  1  is described as follows according to another embodiment: 
     Firstly, the means  10  for determining candidate eNB firstly judges whether the signal strength between each of three neighboring cell eNBs and the MS  2   b  is higher than the first predetermined threshold.
         if the judging result of the means  10  for determining candidate eNB is that the signal strength between each of three neighboring cell eNBs and the MS  2   b  is higher than the first predetermined threshold, then it takes all of three neighboring eNBs  1   b ,  1   d  and  1   e  as candidate eNBs for collaborative MIMO;   if the judging result of the means  10  for determining candidate eNB is that not all the signal strengths from the three neighboring cell eNBs are higher than the first predetermined threshold, for example, the signal strength from eNB  1   b  is less than the first predetermined threshold, but the signal strengths from eNB  1   d  and eNB  1   e  are higher than the first predetermined threshold, the means  10  for determining candidate eNB judges whether the difference value between the signal strength of the one that is less than the first predetermined threshold, and the signal strength of the minimal in these signal strengths which are higher than the first predetermined threshold, is higher than the second predetermined threshold. For example, the first predetermined threshold is 90 dBm, and the second predetermined threshold is 10 dBm. The signal strengths from eNB  1   d  and eNB  1   e  are respectively 100 dBm and 92 dBm, and the signal strength from eNB  1   b  is 88 dBm. The means  10  for determining candidate eNB firstly judges that the signal strengths from eNB  1   d  and eNB  1   e  are higher than the first predetermined threshold, but the signal strength from eNB  1   b  is less than the first predetermined threshold, thus the means  10  for determining candidate eNB firstly takes eNBs  1   d  and  1   e  as candidate eNBs, then the serving eNB  1   a  further compares the difference value between the signal quality from eNB  1   b  and the signal quality from eNB  1   e , the serving eNB finds that the difference value of the signal quality from eNB  1   e  92 dBm minus the signal quality from eNB  1   b  88 dBm is less than the second predetermined threshold, thus the means  10  for determining candidate eNB also takes eNBs  1   b  as candidate eNB;   if the first predetermined threshold is 90 dBm, and the second predetermined threshold is 10 dBm, the signal strengths from eNB  1   d  and eNB  1   e  are respectively 100 dBm and 95 dBm, and the signal strength from eNB  1   b  is 80 dBm. Then the judging result of the means  10  for determining candidate eNB is that the difference value of the signal strength between eNB  1   b  and MS, and the signal strength between eNB  1   e  and MS is higher than the second predetermined threshold, thus the means  10  for determining candidate eNB only takes the two neighboring cell eNBs  1   d  and  1   e  as candidate eNBs for collaborative MIMO;   furthermore, if the signal quality of only one eNB is higher than the first predetermined threshold, for example, only the signal quality of eNB  1   d  is higher than the first predetermined threshold, and the difference value of signal quality between eNB  1   b  and eNB  1   d , and the difference value of signal quality between eNB  1   e  and eNB  1   d  are both higher than the second predetermined threshold, then the judging result of the means  10  for determining candidate eNB is that only eNB  1   d  is taken as candidate eNB for collaborative MIMO.       

     Then, the means  11  for requesting of the serving eNB  1   a  sends resource related information request message to the selected candidate eNB; then, means  12  for obtaining resource related information obtains resource related information from each candidate eNB. 
     Then, the means  130  for resource judging of the means  13  for processing of the serving eNB  1   a  judges whether the available resources from each candidate eNB overlaps the available resources of the serving eNB  1   a.    
     Since the scenario with two candidate eNBs is discussed hereinbefore, it is not necessary to repeat again. Hereinafter, the scenario with three candidate eNBs, for example, eNBs  1   b ,  1   d  and  1   e , will be discussed, the available resources of each of three candidate eNBs may have common parts with the available resources of the serving eNB  1   a  or may not.
         if the available resources of each of three candidate eNBs are not same with the available resources of the serving eNB  1   a , that is, the available resources of each of three candidate eNBs do not overlap the available resources of the serving eNB  1   a , the means  130  for resource judging judges that all of three candidate eNBs can not cooperate with the serving eNB to perform CO-MIMO;   if the available resources of each of three candidate eNBs has common parts with the available resources of the serving eNB  1   a , then the means  130  for resource judging continues to judge whether there are suitable common available resources, for example, judge whether the common available resources of a plurality of candidate eNBs and the serving eNB  1   a  are partly same or identical. If the common available resources of candidate eNBs and serving eNB are shown as  FIG. 5A , the same common available resources is denoted by the shadow with slash lines, then the means  130  for resource judging judges all of the three candidate eNBs may cooperate with the serving eNB  1   a  for collaborative MIMO on the same common available resources, and the serving eNB  1   a  accordingly allocates a part or all of resources corresponding to the shadow with slash lines for the serving eNB  1   a  and other eNBs  1   b ,  1   d  and  1   e ; if for example, the common available resources between two candidate eNBs and serving eNB have overlapping parts, but there is no common available resource between another candidate eNB and serving eNB, then similarly, a part or all of the overlapping common available resources between the two candidate eNBs and the serving eNB are taken as resources for CO-MIMO;   if there are common available resources between each of a plurality of candidate eNBs and the serving eNB  1   a  respectively, and there is no common available resource between every two of the plurality of candidate eNBs, a candidate eNB whose signal quality with the MS is the best among the plurality of candidate eNBs is selected as collaborative eNB to cooperate with the serving eNB to serve the MS, according to the signal quality of each candidate eNB.  FIG. 5B  is taken as example, each of candidate eNB  1   e  and  1   b  has common available resources with the serving eNB  1   a , but there is no same part between the two common available resources, then the means  13  for processing selects a candidate eNB whose signal quality with the MS  2   b  is the best among candidate eNBs as collaborative eNB to cooperate with the serving eNB  1   a . For example, the signal strength between eNB  1   e  and the MS  2   b  is 95 dBm and the signal strength between eNB  1   b  and the MS  2   b  is 88 dBm, then the serving eNB  1   a  selects eNB  1   e  as collaborative eNB, and selects a part or all of the common available resource, as shown by the shadow with transverse line in  FIG. 5B , for the serving eNB  1   a  and collaborative eNB  1   e  to perform CO-MIMO;   if there are common available resources between not all of candidate eNBs  1   b ,  1   d  and  1   e , and the serving eNB  1   a , for example, as shown in  FIG. 5C , candidate eNBs  1   d  and  1   b  have common available resources with the serving eNB  1   a , as shown by the shadow with slash lines, and candidate eNB  1   e  has common available resources with the serving eNB  1   a , as shown by the shadow with transverse lines, and these two common available resources have no intersection with each other, then the means  13  for processing takes each candidate eNB, corresponding to common available resources available for allocation for the maximum number of candidate eNBs and for the serving eNB, as collaborative eNB to cooperate with the serving eNB 1   a  to serve the MS  2   b , that is, as shown in  FIG. 5C , the serving eNB  1   a  takes eNBs  1   d  and  1   b  as collaborative eNBs, and allocates the resources for CO-MIMO for the serving eNB  1   a , collaborative eNB  1   b  and collaborative eNB  1   d  according to corresponding common available resources shown by the shadow with slash lines.       

     The embodiments of the present invention have been described above, but the present invention is not limited to a specific system, equipment and specific protocol, those skilled in the art may make variation and modification within the scope of the appended claims.

Technology Classification (CPC): 7