CN101820669B - Method and device for allocating PDCCH resources - Google Patents

Abstract

The invention discloses a method and a device for allocating PDCCH resources, which is used in a communication system comprising a plurality of cells and allocates PDCCH resources for cell edge users or cell center users in the cells. The method comprises the following steps: dividing PDCCH resources into a plurality of control channel unit CCE sets; configuring main CCE sets and subsidiary CCE sets for the cells based on the CCE sets; and allocating the resources of the main CCE sets to the cell edge users, and allocating the resources of the subsidiary CCE sets to the cell center users. The invention improves the carrying capacity of the PDCCH channel transmission, ensures the reliability of the PDCCH transmission for the edge users, and meets the QoS requirements of the users.

Description

A method and device for PDCCH resource allocation

technical field

The present invention relates to the field of communication technology, in particular to a method and device for allocating PDCCH resources. the

Background technique

3GPP LTE (Long Term Evolution, long-term evolution) system is a long-term evolution version of 3G (3rd Generation, third-generation mobile communication technology). The LTE system provides higher user peak data rates, greater coverage and better Cell edge user QoS (Quality of Service, quality of service), etc. the

In the LTE system, by using OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access technology) in the downlink direction, SC-FDMA (Single Carrier-Frequency Division Multiple Access, single carrier) with low peak-to-average ratio is used in the uplink direction. Frequency Division Multiple Access), in addition, the LTE system also uses the MIMO (Multiple Input Multiple Output) technology of multi-antenna technology to provide spatial multiplexing gain and transmit diversity gain. Therefore, the available resources of the LTE system include three dimensions of time domain, frequency domain and air domain. The base station flexibly and reasonably selects appropriate time slots, PRBs ( Physical Resource Block, MCS (Modulation and Coding Scheme, modulation and coding format), transmit power, MIMO transmission scheme, etc., to improve the total throughput of the system and meet the rate requirements of cell edge users. the

In the LTE system, various types of DCI (Downlink Control Information, downlink control information) sent by the base station to the user are carried in the PDCCH for transmission. Among them, the DCI includes Scheduling Grant, resource indication, modulation and coding mode, etc. the

In the 10ms frame structure defined by LTE, within a TTI (TransmissionTime Interval, transmission time interval) corresponding to a 1ms downlink subframe, only the first n (n<=3) OFDM (Orthogonal Frequency Division Multiplexing, positive Cross frequency division multiplexing) symbols occupy the system bandwidth in the frequency domain and remove the remaining frequency bands after other channels use resources. Among them, other channels such as reference signals, PCFICH (Physical Control Format Indicator Channel, physical format indicator channel), PHICH ( Physical HARQ Indicator Channel, physical HARQ indicator), etc. Therefore, in each downlink subframe, only a limited amount of reserved time-frequency resources can be used to transmit downlink control information, and this part of time-frequency resources is called the control domain Control Region. the

The smallest unit of PDCCH resource allocation is CCE (Control Channel Element, Control Channel Element), and 1 CCE includes 9 REGs (Resource Element Group, Resource Element Group), that is, 36 REs (Resource Element, Resource Element). In order to provide different degrees of reliability through the coding rate, CCE is allowed to have four kinds of AL (Aggregation Level, combination level), AL=1, 2, 4 and 8, corresponding to a PDCCH channel resource occupying 1, 2, 4 or 1 at the same time. 8 CCEs. the

Depending on the type of DCI transmitted, the entire search space of the PDCCH includes CSS (Common Search Space, public search space) and USS (UE-specific Search Space, user-specific search space). The position of the CSS for placing public detection information is fixed, while the USS is used to transmit information related to individual users. The resource mapping of this space needs to be determined by the base station to allocate PDCCH resources to users scheduled in the cell. the

Specifically, the user uses the blind detection method to demodulate the DCI in the PDCCH domain. Each UE monitors the PDCCH candidate (Candidate) sets in the USS of the cell at the same time and tries to demodulate one by one. The number of PDCCH candidate sets corresponding to different ALs is shown in the table 1. the

Table 1 The number of PDCCH candidate sets

The purpose of setting the number of PDCCH candidate sets is to reduce the time spent on user blind detection and reduce processing complexity, but this also largely limits the PDCCH resources that each user can use. The blind detection method also defines the starting position of each UE monitoring PDCCH candidate set. The CCE sequence number S _k corresponding to the monitoring start point is related to the UE_ID and the total number of CCEs in the control domain.

S _k = AL × (Y _k mod [ _{NCCE, k} / AL]) (1)

Y _k ＝(39827·Y _k-1 )mod65537 (2)

Wherein, N _{CCE, k} represents the number of CCEs in the control field of the kth subframe, and Y _-1 is initialized with UE_ID. For example, when N _{CCE, k} =40, UE_ID=1, the positions of the PDCCH candidate sets corresponding to AL=1, 2, 4 and 8 are shown in FIG. 1 . It can be seen from Figure 1 that in the LTE system, the resources used to transmit downlink control information are very limited, and the resource allocation of PDCCH is also different from that of traffic channel resources due to the limitation of the number and location of user candidate sets. Assign different characteristics.

Specifically, from the perspective of a single cell, in the process of PDCCH transmission, when the base station allocates PDCCH resources to users, in order to meet the reliability of user control information transmission, it is necessary to ensure that the CCE size allocated to users is large enough. , in order to avoid resource collision among users and carry more users, it is necessary to reduce the resources allocated to users as much as possible. From the perspective of multiple cells, inter-cell interference leads to performance degradation of edge users on the PDCCH channel, and even causes some edge users to fail to receive DCI correctly. Most edge users can only ensure their reliability by using larger-sized CCEs. Therefore, when allocating PDCCH resources in the LTE system, how to implement the PDCCH channel to carry more users, ensure the reliability of PDCCH transmission of cell edge users, and meet the QoS requirements of edge users is an urgent problem to be solved in the prior art. the

Contents of the invention

In view of this, the present invention provides a method and device for allocating PDCCH resources, which are used to improve the carrying capacity of PDCCH channel transmission, ensure the reliability of PDCCH transmission for edge users, and meet the QoS requirements of users. the

The present invention provides a method for allocating physical downlink control channel PDCCH resources, which is applied in a communication system including multiple cells, and allocates PDCCH resources for cell edge users or cell center users in the multiple cells, and the method includes The following steps:

According to the cell edge blocking rate of the PDCCH transmission in the last subframe, estimate the demand ratio of each cell edge resource used for the current PDCCH transmission, and divide the PDCCH resource into n disjoint CCE sets according to the demand ratio, where n is the number of cells in the cell group;

Distribute one of the CCE sets as the primary CCE set of the cell for the cell, and the primary CCE sets assigned to different cells in the cell group do not overlap each other; the (n-1 ) CCE sets are used as secondary CCE sets of the cell;

Allocating the primary CCE set resources to the cell edge user, and allocating the secondary CCE set resources to the cell center user. the

Preferably, when one of the CCE sets is allocated to the cell as the primary CCE set of the cell, the primary CCE sets allocated to different cells in the cell group do not overlap each other; the CCE sets allocated to other users in the cell group After (n-1) CCE sets are used as the auxiliary CCE sets of the cell, it also includes: setting the transmit power of each CCE in the primary CCE set and the secondary CCE set of the cell, and setting the transmit power of the primary CCE set to be higher than The transmit power of the secondary CCE set: set the same transmit power for CCEs in the consecutive CCE subsets, and have different transmit powers for the CCEs in different CCE consecutive subsets. the

Preferably, allocating the resources of the primary CCE set to the cell edge users, and allocating the resources of the secondary CCE set to the center users of the cell, also includes:

According to the received reference signal received power RSRP of the cell and neighboring cells and the transmit power of the primary CCE set and the secondary CCE set of the cell, the signal-to-interference and noise ratio (SINR) and secondary SINR of the CCE set;

其中，所述目标门限值 中，AL属于所述主辅备选AL集{AL}，DCI为下行控制信息DCI的类型；  Search the PDCCH candidate set in the primary CCE set and the secondary CCE set of the cell, and obtain the primary and secondary candidate AL sets {AL} of the cell users respectively; according to the acquired primary and secondary candidate AL sets {AL} of the cell users }, obtain the corresponding target thresholds of the cell users on the primary and secondary CCE sets respectively

Among them, the target threshold Among them, AL belongs to the primary and secondary candidate AL set {AL}, and DCI is the type of downlink control information DCI;

比较所述辅CCE集的SINR和所述在辅CCE集上对应的目标门限值 

当满足不等式 

分别获取AL为所述主CCE集和辅CCE集的SINR上支持的AL，并获取所述用户在所述主CCE集上的最小AL_min，获取所述用户在所述辅CCE集上的最小AL_min。  Comparing the SINR of the main CCE set with the target threshold corresponding to the main CCE set

Comparing the SINR of the secondary CCE set with the target threshold corresponding to the secondary CCE set

When the inequality is satisfied

Respectively obtain the AL supported by the SINR of the primary CCE set and the secondary CCE set, and obtain the minimum AL min of the user on the primary CCE set, and obtain the minimum AL _min of the user on the secondary CCE set AL _min .

Preferably, the users in the cell are divided into the cell edge users and the cell center users according to the cell RSRP reported by the users;

Allocating the resources of the primary CCE set to the cell edge users, and allocating the resources of the secondary CCE set to the center users of the cell, specifically include:

When the user is a cell edge user, sort the cell edge users in ascending order of AL _min on the primary CCE set, and the cell edge users in the primary CCE set and belonging to the cell edge user PDCCH candidate set In the CCE continuous subset, judge whether there is an idle CCE resource whose size is the AL _min , if there is, allocate the CCE resource corresponding to the AL _min to the cell edge user, otherwise jump to the next cell edge user;

When the user is a cell center user, sort the cell center users in ascending order of AL _min on the secondary CCE set, and the cell center users in the secondary CCE set and belonging to the cell center user PDCCH candidate set In the continuous subset of CCEs, it is judged whether there is an idle CCE resource whose size is the AL _min , and if there is, the CCE resource corresponding to the AL _min is allocated to the cell center user, otherwise, jump to the next cell center user.

Preferably, allocating the primary CCE set resources to the cell edge users, allocating the secondary CCE set resources to the cell center users, and then further including judging whether there are remaining primary CCE set resources or secondary CCE set resources ;

When it is determined that there are remaining primary CCE set resources and there are cell center users who have not been allocated secondary CCE set resources, the cell centers that have not allocated secondary CCE set resources The user sorts, in the CCE continuous subset in the main CCE set and belonging to the cell center user PDCCH candidate set, judge whether there is an idle CCE resource whose size is the AL _min , if there is a CCE resource corresponding to the AL _min Assign to the cell center user who has not allocated secondary CCE set resources, otherwise jump to the next cell center user who has not allocated secondary CCE set resources; when it is judged that there is no remaining primary CCE set resource When the cell center user of the CCE set resource is used, block the cell center user who has not allocated the secondary CCE set resource;

When it is judged that there are remaining secondary CCE set resources and there are cell edge users not allocated primary CCE set resources, the cell edge users not allocated primary CCE set resources are checked according to the QoS priority from high to low. Sort, in the secondary CCE set and belong to the CCE continuous subset of the cell edge user PDCCH candidate set, judge whether there is a free CCE resource with the size of the AL _min , if there is, allocate the CCE resource corresponding to the AL _min to The cell-edge users who have not been allocated primary CCE set resources, otherwise jump to the next cell-edge user that has not been allocated primary CCE set resources; when it is judged that there is no remaining secondary CCE set resources When the cell edge users of the primary CCE set resources are used, block the cell edge users that are not assigned the primary CCE set resources;

The QoS level is one or more of the user's transmission delay requirement and fairness parameters. the

The present invention also provides a physical downlink control channel PDCCH resource allocation device, which is characterized in that it is applied in a communication system including multiple cells, and allocates PDCCH resources for cell edge users or cell center users in the multiple cells , the device consists of:

A division module, configured to estimate the demand ratio of each cell edge resource used for the current PDCCH transmission according to the cell edge blocking rate of the PDCCH transmission in the last subframe, and divide the PDCCH resource into n disjoint ones according to the demand ratio CCE set, n is the number of cells in the cell group;

A configuration module, configured to assign one of the CCE sets to the cell as the primary CCE set of the cell according to the plurality of CCE sets obtained by the partitioning module, and assign it to the primary CCE sets of different cells in the cell group The CCE sets do not overlap with each other; (n-1) CCE sets assigned to other users in the cell group are used as the secondary CCE sets of the cell;

A resource allocation module, configured to allocate resources of the primary CCE set to the cell edge user, and allocate resources of the secondary CCE set to the cell center user. the

Preferably, the device further includes a setting module, configured to set the transmission power of each CCE in the main CCE set and the auxiliary CCE set of the cell, and set the transmission power of the main CCE set to be higher than the transmission power of the auxiliary CCE set ; Set the CCEs in the continuous CCE subsets to have the same transmission power, and the CCEs belonging to different CCE continuous subsets have different transmission powers. the

Preferably, the device further includes a calculation module, which is used to calculate the primary CCE set of the user in the cell according to the received RSRP of the cell and the adjacent cell and the transmission power of the primary CCE set and the secondary CCE set of the cell, respectively. The SINR and the SINR in the auxiliary CCE set;

其中，所述目标门限值 中，AL属于所述主辅备选AL集{AL}，DCI为下行控制信息DCI的类型；  The device also includes an acquisition module, configured to search for a PDCCH candidate set in the primary CCE set and secondary CCE set of the cell, and obtain the primary and secondary candidate AL sets {AL} of the cell users respectively; and according to the obtained The primary and secondary alternative AL sets {AL} of the cell users, respectively obtain the corresponding target thresholds of the cell users on the primary and secondary CCE sets

Among them, the target threshold Among them, AL belongs to the primary and secondary candidate AL set {AL}, and DCI is the type of downlink control information DCI;

比较所述辅CCE集的SINR和所述在辅CCE集上对应的目标门限值 当满足不等式 

分别获取AL为所述主CCE集和辅CCE集的SINR上支持的AL，并获取所述用户在所述主CCE集上的最小AL_min，获取所述用户在所述辅CCE集上的最小AL_min。  The acquiring module is further configured to compare the SINR of the main CCE set with the target threshold corresponding to the main CCE set

Comparing the SINR of the secondary CCE set with the target threshold corresponding to the secondary CCE set When the inequality is satisfied

Respectively obtain the AL supported by the SINR of the primary CCE set and the secondary CCE set, and obtain the minimum AL min of the user on the primary CCE set, and obtain the minimum AL _min of the user on the secondary CCE set AL _min .

Preferably, the division module is further configured to divide the users in the cell into the cell edge users and the cell center users according to the cell RSRP reported by the users;

The resource allocation module specifically includes a judgment sub-module and an allocation sub-module;

When the user is a cell edge user, sort the cell edge users in ascending order of AL _min on the main CCE set, and the judging submodule is in the main CCE set and belongs to the cell edge In the CCE continuous subset of the user PDCCH candidate set, it is judged whether there is an idle CCE resource whose size is the AL _min , and when the judgment result is yes, the allocation submodule allocates the CCE resource corresponding to the AL _min to the Cell edge user, otherwise jump to the next cell edge user;

When the user is a cell center user, sort the cell center users in ascending order of AL _min on the secondary CCE set, and the judging submodule is in the secondary CCE set and belongs to the cell center In the CCE continuous subset of the user PDCCH candidate set, it is judged whether there is an idle CCE resource whose size is the AL _min , and when the judgment result is yes, the allocation submodule allocates the CCE resource corresponding to the AL _min to the The cell center user, otherwise jump to the next cell center user.

Preferably, the resource allocation module also includes a judgment submodule, an allocation submodule and a processing submodule, and the judgment submodule is specifically used to judge whether there are remaining primary CCE set resources or auxiliary CCE set resources;

When the judging sub-module judges that there are remaining primary CCE set resources and determines that there are cell center users who have not allocated secondary CCE set resources, the unallocated secondary CCE set resources are allocated according to the order of QoS priority from high to low The cell center users are sorted, and the judging submodule is in the main CCE set and belongs to the CCE continuous subset of the cell center user PDCCH candidate set, and judges whether there is an idle CCE resource whose size is the AL _min . When the judgment result When yes, the allocation submodule allocates the CCE resource corresponding to the AL _min to the cell center user who has not allocated the secondary CCE set resource, otherwise jumps to the next cell center user which has not allocated the secondary CCE set resource; When the judging submodule determines that there are no remaining primary CCE set resources and determines that there are cell center users who have not been allocated secondary CCE set resources, the processing submodule will Perform blocking processing;

When the judging sub-module judges that there are remaining secondary CCE set resources and determines that there are cell edge users who have not allocated primary CCE set resources, the unallocated primary CCE set resources will be allocated according to the order of QoS priority from high to low The cell edge users are sorted, and the judging submodule is in the auxiliary CCE set and belongs to the CCE continuous subset of the cell edge user PDCCH candidate set, and judges whether there is an idle CCE resource whose size is the AL _min , when the judging result When yes, the allocation submodule allocates the CCE resource corresponding to the AL _min to the cell edge user who has not allocated the resource of the primary CCE set, otherwise jumps to the next cell edge user who has not allocated the resource of the primary CCE set; When the judging submodule determines that there are no remaining secondary CCE set resources and determines that there are cell edge users that have not been allocated primary CCE set resources, the processing submodule will Perform blocking processing;

The QoS level is one or more of the user's transmission delay requirement and fairness parameters. the

Compared with the prior art, the technical solution provided by the invention has the following advantages:

Select the appropriate CCE size for each user according to the user's channel conditions, allocate primary CCE set resources for edge users, and allocate secondary CCE set resources for central users, which meets the reliability of user PDCCH transmission, saves CCE resources, and ensures access More users can improve the carrying capacity of the PDCCH channel, ensure the reliability of PDCCH transmission for edge users, and meet the QoS requirements of users. the

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the present invention or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts. the

Fig. 1 is a schematic diagram of the CCE position corresponding to the PDCCH candidate set in the prior art;

FIG. 2 is a schematic flow diagram of a method for PDCCH resource allocation provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic flow diagram of a method for PDCCH resource allocation provided by Embodiment 2 of the present invention;

Fig. 4 is the schematic diagram of division of primary and secondary CCE sets and power settings of the cell provided by the present invention;

FIG. 5 is a schematic flow diagram of a method for PDCCH resource allocation provided by Embodiment 3 of the present invention;

FIG. 6 is a schematic flow diagram of a method for PDCCH resource allocation provided by Embodiment 4 of the present invention;

FIG. 7 is a schematic structural diagram of an apparatus for allocating PDCCH resources according to an embodiment of the present invention. the

Detailed ways

The core idea of the present invention is: divide the PDCCH resource into multiple control channel element CCE sets, and configure the primary CCE set and secondary CCE set for the cell according to the multiple divided CCE sets, and allocate the primary CCE set resources to the cell edge users, Allocate secondary CCE set resources to cell center users. the

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. the

Embodiment 1 of the present invention provides a method for allocating PDCCH resources, which is applied in a communication system including multiple cells, and allocates PDCCH resources for cell edge users or cell center users in multiple cells, as shown in Figure 2, the method includes the following steps:

Step s201, dividing PDCCH resources into multiple CCE sets;

Step s202, configuring a primary CCE set and a secondary CCE set for the cell according to multiple CCE sets;

In step s203 , resources of the primary CCE set are allocated to cell edge users, and resources of the secondary CCE set are allocated to cell center users. the

By using the present invention, the carrying capacity of PDCCH channel transmission is improved, the reliability of PDCCH transmission of edge users is guaranteed, and the QoS requirements of users are met. the

Embodiment 2 of the present invention provides a method for allocating PDCCH resources, which is applied to allocating PDCCH resources in an LTE system, and allocating PDCCH resources for cell edge users or cell center users in multiple cells. The LTE system includes: TD-LTE (Time Division-LTE, Time Division-Long Term Evolution) system, FDD-LTE (Frequency Division Duplex-LTE, Frequency Division Duplex-Long Term Evolution) system and other types of communication systems. As shown in Figure 3, the method includes the following steps:

Step s301, dividing PDCCH resources in the current subframe. the

Specifically, the demand ratio of each cell edge resource used in this PDCCH transmission is determined according to the cell edge area blocking rate of the PDCCH in the previous subframe, and the PDCCH resources in the current subframe are divided into n disjoint CCE set, where n is the number of cells in a cell group. Wherein, the PDCCH resource refers to the CCE resource of the PDCCH USS part. the

For example, when the blocking rate of the cell edge area of the PDCCH in the previous subframe is high, it means that when the PDCCH resources were allocated in the previous subframe, many users in the edge area were not allocated PDCCH resources, resulting in a high blocking rate, that is, the corresponding The demand for edge resources of the cell is relatively large, and when dividing the PDCCH resources in the current subframe, the demand ratio of the corresponding cell edge resources can be appropriately increased; similarly, when the blocking rate of the cell edge area of the PDCCH in the previous subframe is low, the cell When a large number of PDCCH resources are not allocated in the edge area, the demand ratio of corresponding cell edge resources may be appropriately reduced. the

It should be noted that, in the embodiment of the present invention, the blockage rate of the cell edge region of the PDCCH in the above subframe is used as a reference to divide the PDCCH resources, and flexibly adjust the size of the CCE set of each cell to realize the The PDCCH resource division is adjusted according to the load condition of the cell, and the resource utilization rate of the cell is improved. the

According to the above PDCCH resource division method, the CCEs in the divided n disjoint CCE sets may be continuous CCEs or discrete CCEs. When the sequence numbers of the CCEs in the CCE set are arranged continuously, the CCEs arranged continuously in the CCE set constitute a continuous CCE subset. It can be understood that a CCE set may contain multiple consecutive CCE subsets. the

Step s302, allocate primary and secondary CCE sets for each cell. the

From n disjoint CCE sets, select a CCE set corresponding to the proportion of the edge resource demand of the cell as the primary CCE set of the cell. -1) CCE sets are used as secondary CCE sets of the cell. That is, in a cell group with n cells, each cell has 1 primary CCE set and (n-1) secondary CCE sets. the

Step s303, setting the transmission power of the primary CCE set and the secondary CCE set of the cell. the

After allocating the primary CCE set and secondary CCE set for each cell, set the transmit power of each CCE in the primary CCE set of the cell, and set the transmit power of each CCE in the secondary CCE set of the cell. the

Specifically, for each cell, the transmit power of the primary CCE set of the cell is set to be higher than the transmit power of the secondary CCE set of the cell. In the primary CCE set and the auxiliary CCE set, set the CCEs in the consecutive CCE subsets to have the same power, and the CCEs belonging to different CCE consecutive subsets can have different powers, and set the power of different CCE consecutive subsets in the primary CCE set to the minimum The value is greater than the maximum power value of different consecutive subsets of CCEs in the secondary CCE set. the

In the cellular mobile system, when the size n of the cell grouping takes a typical value of 3, the division of primary CCE and secondary CCE in each cell is shown in Figure 4(a), and the corresponding power settings are shown in Figure 4(b), where , the squares marked with shading (diagonal bars, grids, and dots) correspond to the primary CCE set of the cell, and the white-bottomed squares correspond to the secondary CCE set of the cell. power. The main CCE set and the auxiliary CCE set do not overlap with each other. Set the transmit power of the main CCE set higher than that of the auxiliary CCE set. The CCEs in the CCE consecutive subsets are set to the same power, and the CCEs in different CCE consecutive subsets are set differently. power. the

In step s304, the receiving user measures and reports the RSRP (Reference Signal Received Power, Reference Signal Received Power) of the own cell and neighboring cells. the

Step s305, determining the SINR (Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio) of the user on the primary CCE set and the secondary CCE set. the

Acquire the transmission performance of users in the cell on the primary and secondary CCE sets according to the primary and secondary CCE sets allocated to the cell and the CCE transmit power in the primary and secondary CCE sets. The following takes the user's SINR on the primary CCE set and the secondary CCE set as an example for illustration. the

Specifically, take the calculation of the ratio SINR of user r in the first CCE continuous subset in cell k as an example:

According to the RSRP reported by the user, the PL (PathLoss, path loss) between the user and the base station of the cell and the adjacent base station is calculated, and the power allocation of the cell group where the cell k is located is substituted into the following expression:

${\mathrm{<span\; class="notranslate">\; SINR</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}}^{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; P</span>}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; /</span><span\; class="notranslate">\; (</span>\underset{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; \&NotEqual;</span>\mathrm{<span\; class="notranslate">\; k</span>}}{\overset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; .</span>{\mathrm{<span\; class="notranslate">\; PL</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span>$

Get the SINR of user r on the corresponding CCE continuous subset. Among them, P _k,1 is the power allocated by cell k to the first continuous subset of CCEs, P _m,1 is the power allocated to this continuous subset of CCEs by other cells in the cell group, and N ₀ represents the noise power.

According to the above process of obtaining the SINR on the CCE continuous subset, traverse all the CCE continuous subsets in the primary and secondary CCE sets, and obtain the user's {SINR_P} _r on the primary CCE set and {SINR_S} _r on the secondary CCE set .

Step s306, searching for a PDCCH candidate set in the primary CCE set and secondary CCE set of the cell. the

Specifically, search for the PDCCH candidate set of user r in the primary CCE set according to formulas (1) and (2), and obtain the primary candidate AL set {AL_P} _r of user r; search for the PDCCH candidate set in the secondary CCE set, and obtain Auxiliary alternative AL set {AL_S} _r for user r.

When there is no candidate PDCCH set in the primary CCE set or the secondary CCE set, set the corresponding candidate AL set to be empty. the

Step s307, acquiring the target threshold value corresponding to the DCI-AL combination. the

The BLER performance curve of each DCI-AL combination is obtained through link-level simulation, where DCI is the type of downlink control information that may be sent, including scheduling grants, resource indications, or modulation and coding methods, etc. AL indicates the CCE combination level, AL=1 , 2, 4 or 8. the

，在DCI-AL目标门限值 

中下标AL∈{AL_P}或AL∈{AL_S}，{AL_P}和{AL_S}为用户的主辅备选AL集。  Specifically, take the SINR corresponding to 1% BLER as the target threshold of DCI-AL, and express it as

, at the DCI-AL target threshold

The subscript AL∈{AL_P} or AL∈{AL_S}, {AL_P} and {AL_S} are the user's primary and secondary alternative AL sets.

Step s308, obtaining the minimum AL supported by the user on the primary and secondary CCE sets. the

，在确定向用户r下发的DCI_r类型后，通过比较主 CCE集的{SINR_P}_r和目标门限值 

(AL_k∈{AL_P})、比较辅CCE集的{SINR_S}_r和目标门限值 

(AL_j∈{AL_S})分别确定小区内用户r在主辅CCE集上支持的最小AL。  Specifically, according to the SINR of the user on the primary and secondary CCE sets obtained in step s305 and the target threshold value obtained in step s307

, after determining the type of DCI _r delivered to user r, by comparing {SINR_P} _r of the main CCE set with the target threshold

(AL _k ∈ {AL_P}), compare the {SINR_S} _r of the secondary CCE set with the target threshold

(AL _j ∈ {AL_S}) respectively determine the minimum AL supported by user r in the cell on the primary and secondary CCE sets.

满足不等式 

，获取用户在主CCE集上可支持的最小AL，记为{AL_P_min}_r，获取用户在辅CCE集上可支持的最小AL，记为{AL_S_min}_r，其中AL为SINR可支持的AL，余量的具体取值可根据信道状况等条件进行设定。可以理解的是，小区中每一个用户都有一个AL_P_min和一个AL_S_min。  When the SINR of the user on the primary and secondary CCE sets and the corresponding target threshold

satisfy the inequality

, to obtain the minimum AL supported by the user on the primary CCE set, denoted as {AL_P _min } _r , to obtain the minimum AL supported by the user on the secondary CCE set, denoted as {AL_S _min } _r , where AL is the SINR supportable AL, the specific value of the margin can be set according to conditions such as channel conditions. It can be understood that each user in the cell has an AL_P _min and an AL_S _min .

When the primary/secondary alternative AL set of user r is empty, or {SINR_P} _r cannot support {AL_P} _r , {SINR_S} _r cannot support any AL option in {AL_S} _r , set {AL_P _min } _r , { AL_S _min } _r is zero.

In step s309, users are divided into cell center users and cell edge users according to the local RSRP reported by the users. the

Step s310 , sort the cell edge users in ascending order of AL_P _min supported on the main CCE set and generate a list A, and initialize the list A.

The cell edge users in the list A are arranged in ascending order of AL_P _min supported on the main CCE set, and list A is initialized so that when the index i=1, the list A points to the first users. And according to the order of AL_P _min in the list A from small to large, the main CCE set resources are allocated to the cell edge users in turn.

Step s311, in the primary CCE set assigned to the cell and in the continuous subset of CCEs belonging to the user PDCCH candidate set, determine whether there is a free CCE resource with a size of {AL_P _min } _i , if yes, execute step s312, otherwise execute step s313.

In different PDCCH transmission processes, the primary CCE set assigned to the cell changes, while in PDCCH transmission, each user’s PDCCH candidate set is fixed, so when CCE resources are allocated to cell edge user i in the primary CCE set, The CCE resource must be within the range of the user PDCCH candidate set, otherwise the user cannot occupy the CCE resource and use the CCE resource to transmit PDCCH downlink control signaling. That is, the CCE resource allocated to the user is a continuous CCE subset in the main CCE set, and the continuous CCE subset belongs to the PDCCH candidate set of user i. the

Step s312, allocate the primary CCE resource corresponding to {AL_P _min } _i to user i, and mark the CCE resource as "occupied", and execute step 314.

Step s313, put user i into list C, and execute step s314. the

Step s314, judging whether the desired cell edge users in the list A have been traversed, if yes, execute step s316, otherwise execute step s315. the

Step s315, update i=i+1 of list A to point to the next user in list A, and return to step s310. the

Step s316, sort the cell center users according to the ascending order of AL_S _min supported on the secondary CCE set, generate list B, and initialize list B.

The cell center users in list B are arranged in ascending order of AL_S _min supported on the secondary CCE set, and list B is initialized so that list B points to the first one in list B when index j=1 users, and allocate secondary CCE set resources to cell center users in sequence according to the order of AL_S _min in list B from small to large.

Step s317, in the CCE contiguous subset in the secondary CCE set of the cell and belonging to the user PDCCH candidate set, judge whether there is an idle secondary CCE resource with a size of {AL_S _min } _j , if yes, execute step s318, otherwise execute step s319.

Step s318, allocate the CCE secondary resource corresponding to {AL_S _min } _j to user j, and mark the CCE resource allocated to user j as "occupied", and execute step s320.

The CCE resource allocated to user j is a continuous CCE subset in the secondary CCE set, and the continuous CCE set belongs to the PDCCH candidate set of user j. the

Step s319, put user j into list D, and execute step s320. the

Step s320, judging whether the desired cell center user in the list B has been traversed, if yes, execute step s322, otherwise execute step s321. the

In step s321, j=j+1 in list B is updated to point to the next user in list B, and step s316 is executed. the

Step s322, determine whether there are remaining unallocated CCE resources in the primary and secondary CCE sets of the cell, if there are no remaining unallocated CCE resources, execute step s323, otherwise, execute step s324. the

Follow steps s310-step s315 to allocate primary CCE resources of the cell for cell edge users, and allocate secondary CCE resources for cell center users according to steps s316-step s321, traverse cell edge users and cell center users, and generate lists C and List D, wherein, list C is a set of cell edge users not allocated primary CCE set resources, and list D is a set of cell center users not allocated secondary CCE set resources. the

When both the edge user and the central user in the cell are assigned primary and secondary CCE set resources, list C and list D are empty, and the resource allocation process is completed without secondary resource allocation. the

When the list C is not empty, all the resources of the main CCE set in this cell are allocated to the edge users, and there are still edge users who have not been allocated the resources of the main CCE set, and the secondary resource allocation is performed for the edge users in the list C, specifically , allocate the remaining unallocated secondary CCE set resources to the edge users in list C; when list D is not empty, all the secondary CCE set resources of the cell are allocated to central users, and there are still centers that have not allocated secondary CCE set resources For the user, secondary resource allocation is performed for the central user in list D, and the remaining unallocated primary CCE set resources are allocated for the central user in list D. When performing secondary resource allocation, it is necessary to ensure that there are remaining unallocated resources of the primary CCE set or secondary CCE set. Therefore, in this step, it is determined whether there are unallocated primary and secondary CCE resources. Of course, it is also possible to first determine whether the list C is empty, and then determine whether there are remaining unallocated CCE resources in the secondary CCE set when it is determined that the list C is not empty, and list C only when there are unallocated secondary CCE set resources Allocation of secondary CCE set resources for cell edge users in the cell can be similarly obtained for list D; or, judging whether there are remaining CCE resources and judging whether the list is empty is performed at the same time, and the specific sequence change does not affect the scope of protection of the present invention . the

In step s323, the secondary resource allocation process is not performed. the

When it is judged that there are no remaining unallocated primary and secondary CCE resources, resources cannot be provided for the cell users in list D or list C for secondary resource allocation. Therefore, the users in list D or list C are blocked, that is, in During PDCCH transmission in the current subframe, no CCE resources are allocated to the cell users in List D or List C. the

In step s324, a secondary resource allocation process is performed. the

Specifically, two situations are described:

1. When it is determined that there are remaining unallocated CCE resources in the main CCE set of the cell, it means that all cell edge users have been allocated the resources of the main CCE set, and the list C is empty. At this point, when the list D is not empty, the unallocated primary CCE set resources are allocated for the cell center users in the list D. the

2. When it is determined that there are remaining unallocated CCE resources in the secondary CCE set of the cell, it means that all the users in the center of the cell have been allocated resources of the secondary CCE set, and the list D is empty. At this time, when the list C is not empty, unallocated secondary CCE set resources are allocated to the cell edge users in the list C. the

It should be noted that, in the embodiment of the present invention, the resources of the primary CCE set are allocated to the edge users, and the resources of the secondary CCE set are allocated to the central users. Reliability of transmission, and save CCE resources, to ensure access to more users to improve the carrying capacity of the PDCCH channel. the

By using the present invention, the carrying capacity of PDCCH channel transmission is improved, the reliability of edge user PDCCH transmission is guaranteed, and the QoS requirements of users are met

Embodiment 3 of the present invention provides a method for PDCCH resource allocation, wherein secondary resource allocation is performed on cell edge users, as shown in FIG. 5 , the method includes the following steps:

Step s501, when there are remaining unallocated CCE resources in the secondary CCE set, judge whether the list C is empty. When the list C is empty, all cell edge users have all allocated the resources of the primary CCE set, and there is no need to perform secondary Resource allocation, otherwise go to step s502. the

When performing secondary resource allocation to cell edge users, the secondary CCE set resources allocated to cell edge users are the remaining unallocated secondary CCE resources in the first resource allocation process. Therefore, it should be noted that in the present invention In an embodiment, the proposed secondary CCE set resource is the remaining unallocated secondary CCE resource in the first resource allocation process. the

Step s502, reorder the cell edge users in the list C in descending order of delay requirements, and initialize the list C. the

The cell edge users in list C are arranged in descending order of user service delay requirements, and list C is initialized so that list C points to the first user in list C when all k=1, And according to the order of AL_S _min in the list C from small to large, the secondary CCE set resources are allocated to the cell edge users in sequence.

Step s503, in the CCE continuous subset in the secondary CCE set of the cell and belonging to the user PDCCH candidate set, determine whether there is a free CCE resource with a size of {AL_S _min } _k , if yes, perform step s504, otherwise, perform step s505.

Step s504, allocate the secondary CCE resource corresponding to {AL_S _min } _k to user k, and mark the CCE resource allocated to user k as "occupied", and execute step s506.

Step s505, perform blocking processing on user k. the

In the secondary resource allocation for the cell edge users in list C, there is no free secondary CCE resource with size {AL_S _min } _k in the secondary CCE set of the cell and the continuous subset of CCEs belonging to the user PDCCH candidate set to be allocated to user k When , block processing is performed on user k, that is, no CCE resources are allocated to user k during the current PDCCH transmission process.

Step s506, judging whether all the cell edge users in the list C have been traversed, if yes, end the process, otherwise execute step s507. the

Step s507, update k=k+1 of list C to point to the next user in the list, and return to step s503. the

End the process. the

It should be noted that, in the embodiment of the present invention, primary and secondary CCE set resources are allocated to cell edge users and cell center users respectively, and all users in the cell are traversed. If there are unallocated CCE resources and it is determined that there are unallocated CCE resources When there are many users in the cell, the users are sorted according to the delay requirements of the users, and the unallocated CCE resources are allocated to the cell users who have not been allocated CCE resources according to the priority of the delay requirements. The cell edge users with high delay requirements, Users in the center of the cell give priority to using the remaining resources of the secondary and primary CCE sets, which can improve resource utilization while taking into account the user's delay requirements, and meet the user's QoS requirements. the

By using the present invention, the carrying capacity of PDCCH channel transmission is improved, the reliability of PDCCH transmission of edge users is guaranteed, and the QoS requirements of users are met. the

Embodiment 4 of the present invention provides a method for PDCCH resource allocation, wherein secondary resource allocation is performed on cell center users, as shown in FIG. 6 , the method includes the following steps:

Step s601, when there are remaining unallocated CCE resources in the main CCE set, judge whether the list D is empty. When the list D is empty, all the users in the center of the cell have all allocated the resources of the main CCE set, and there is no need to carry out secondary resource allocation. Allocation, otherwise go to step s602. the

When performing secondary resource allocation to cell center users, the primary CCE set resources allocated to cell center users are the remaining unallocated primary CCE resources in the first resource allocation process. Therefore, it should be noted that, in the present invention In an embodiment, the proposed primary CCE set resource is the remaining unallocated primary CCE resource in the first resource allocation process. the

Step s602, reorder the cell center users in the list D in descending order of delay requirements, and initialize the list D. the

The cell center users in list D are arranged in descending order according to user service delay requirements, and list D is initialized so that list D points to the first user in list D when all n=1, And according to the order of AL_P _min in the list D from small to large, the main CCE set resources are allocated to the cell edge users in turn.

Step s603, in the CCE contiguous subset of the primary CCE set of the cell and belonging to the user PDCCH candidate set, determine whether there is a free CCE resource with a size of {AL_P _min } _n , if yes, perform step s604, otherwise, perform step s605.

Step s604, allocate the primary CCE resource corresponding to {AL_P _min } _n to user n, and mark the CCE resource allocated to user n as "occupied", and execute step s605.

Step s605, perform blocking processing on user n. the

In the secondary resource allocation for the cell center users in list D, there is no idle primary CCE resource with size {AL_P _min } _n in the cell primary CCE set and the CCE continuous subset belonging to the user PDCCH candidate set to be allocated to user n When , block processing is performed on user n, that is, no CCE resources are allocated to user n during the current PDCCH transmission process.

Step s606, judging whether all the cell edge users in the list D have been traversed, if yes, end the process, otherwise execute step s607. the

In step s607, update n=n+1 in the list D to point to the next user in the list, and return to step s603. the

End the process. the

By using the PDCCH resource allocation method provided by the present invention, the carrying capacity of PDCCH channel transmission is improved, the reliability of PDCCH transmission for edge users is guaranteed, and the QoS requirements of users are met. the

Embodiment 5 of the present invention provides a device for allocating PDCCH resources, which is applied in a communication system including multiple cells, and allocates PDCCH resources for cell edge users or cell center users in multiple cells, as shown in FIG. 7 , the Devices include:

Division module 10, for dividing PDCCH resources into a plurality of CCE sets;

The configuration module 20 is used to configure the main CCE set and the auxiliary CCE set for the cell according to the multiple CCE sets obtained by dividing the division module 10;

The resource allocation module 30 is configured to configure the primary CCE set and the secondary CCE set for the cell according to the configuration module 20, allocate the primary CCE set resources to the cell edge users, and allocate the secondary CCE set resources to the cell center users. the

Wherein, the dividing module 10 is specifically used for estimating the demand ratio of each cell edge resource used for the current PDCCH transmission according to the cell edge blocking rate of the PDCCH transmission in the last subframe, and dividing the PDCCH resource into n disjoint resource ratios according to the demand ratio. CCE set, n is the number of cells in the cell group;

The configuration module 20 is specifically used to assign a CCE set to the cell as the primary CCE set of the cell, and the primary CCE sets assigned to different cells in the cell group do not overlap with each other; (n-1) CCEs assigned to other users in the cell group set as the auxiliary CCE set of the cell;

The device also includes a setting module 40, which is used to set the transmission power of each CCE in the main CCE set and the auxiliary CCE set of the cell, the transmission power of the main CCE set is set higher than the transmission power of the auxiliary CCE set; the CCE in the continuous subset of CCEs is set With the same transmission power, CCEs belonging to different continuous CCE subsets have different transmission powers. the

The device also includes a calculation module 50, which is used to calculate the SINR of the cell user in the primary CCE set and the SINR in the secondary CCE set according to the received RSRP of the cell and neighboring cells and the transmission power of the primary CCE set and the secondary CCE set of the cell ;

，其中，目标门限值 中，AL属于主辅备选AL集{AL}，DCI为下行控制信息DCI的类型；  The device also includes an acquisition module 60, which is used to search for a PDCCH candidate set in the primary CCE set and the secondary CCE set of the cell, and obtain the primary and secondary alternative AL sets {AL} of the cell users respectively; Select the AL set {AL} to obtain the corresponding target thresholds of the cell users on the primary and secondary CCE sets

, where the target threshold Among them, AL belongs to the primary and secondary alternative AL set {AL}, and DCI is the type of downlink control information DCI;

；当满足不等式 

，分别获取AL为主CCE集和辅CCE集的SINR上支持的AL，并获取用户在主CCE集上的最小AL_min，获取用户在辅CCE集上的最小AL_min。  The acquisition module 60 is also used to compare the SINR of the cell user in the primary CCE set calculated by the calculation module 50 with the corresponding target threshold value in the primary CCE set , by comparing the SINR of the cell user in the secondary CCE set calculated by the calculation module 50 with the corresponding target threshold value in the secondary CCE set

; when satisfying the inequality

, respectively obtain the AL supported by the SINR of the primary CCE set and the secondary CCE set, obtain the minimum AL _min of the user on the primary CCE set, and obtain the minimum AL _min of the user on the secondary CCE set.

Wherein, dividing module 10 is also used for, according to the community RSRP reported by the user, the user in the community is divided into the cell edge user and the cell center user;

Wherein, the resource allocation module 30 specifically includes a judgment submodule 31 and an allocation submodule 32;

When the user is a cell edge user, the cell edge users are sorted in ascending order of AL _min on the main CCE set, and the judging submodule 31 is in the main CCE set and belongs to the CCE continuous subset of the cell edge user PDCCH candidate set In, judging whether there is an idle CCE resource whose size is AL _min , when the judging result is yes, the allocation submodule 32 allocates the CCE resource corresponding to AL _min to the cell edge user, otherwise jumps to the next cell edge user;

When the user is a cell center user, the cell center users are sorted in ascending order of AL _min on the secondary CCE set, and the judging submodule 31 is in the secondary CCE set and belongs to the CCE continuous subset of the cell center user PDCCH candidate set Inside, judge whether there is an idle CCE resource whose size is AL _min , when the judgment result is yes, the allocation submodule 32 allocates the CCE resource corresponding to AL _min to the cell center user, otherwise jumps to the next cell center user.

Wherein, the resource allocation module 30 also includes a judgment sub-module 31, an allocation sub-module 32 and a processing sub-module 33, the judgment sub-module 31 is specifically used to judge whether there are remaining main CCE set resources or auxiliary CCE set resources;

When the judging sub-module 31 judges that there are remaining primary CCE set resources and determines that there are cell center users who have not allocated secondary CCE set resources, the cell centers that have not allocated secondary CCE set resources will The users are sorted, and the judgment submodule 31 is in the main CCE set and belongs to the CCE continuous subset of the cell center user PDCCH candidate set, and judges whether there is an idle CCE resource with a size of AL _min . When the judgment result is yes, the allocation submodule 32 Allocate the CCE resource corresponding to AL _min to the cell center user who has not allocated the secondary CCE set resource, otherwise jump to the next cell center user who has not allocated the secondary CCE set resource; when the judging sub-module 31 judges that there is no remaining primary CCE When it is determined that there are cell center users who have not allocated secondary CCE set resources, the processing submodule 33 performs blocking processing on the cell center users that have not allocated secondary CCE set resources;

When the judging sub-module 31 judges that there are remaining secondary CCE set resources and determines that there are cell edge users who have not allocated primary CCE set resources, the cell edge users that have not allocated primary CCE set resources will be selected according to the order of QoS priority from high to low. The users are sorted, and the judging submodule 31 is in the secondary CCE set and belongs to the CCE continuous subset of the cell edge user PDCCH candidate set, judging whether there is an idle CCE resource with a size of AL _min , and when the judging result is yes, the allocating submodule 32 Allocate the CCE resources corresponding to AL _min to the cell edge users who have not allocated the resources of the primary CCE set, otherwise jump to the next cell edge user who has not allocated the resources of the primary CCE set; When it is determined that there are cell edge users who have not allocated the resources of the main CCE set, the processing submodule 33 performs blocking processing on the cell edge users who have not allocated the resources of the main CCE set;

Wherein, the QoS level is one or more of user transmission delay requirements and fairness parameters. the

By using the device for allocating PDCCH resources provided by the embodiment of the present invention, the carrying capacity of PDCCH channel transmission is improved, the reliability of PDCCH transmission for edge users is ensured, and the QoS requirements of users are met. the

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, a personal computer, a server, or a network device, etc.) executes the methods described in various embodiments of the present invention. the

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention. the

Claims (10)

1. the method for a physical downlink control channel PDCCH resource allocation; It is characterized in that; Be applied to comprise in the communication system of a plurality of sub-districts, be Cell Edge User in said a plurality of sub-districts or Cell Center User distribution PDCCH resource, said method comprising the steps of:

Each the cell edge resource requirement ratio that is used for current PDCCH transmission according to the cell edge blocking rate estimation of last subframe PDCCH transmission; And be n disjoint CCE collection according to said demand percentage with said PDCCH resource division, n is the number of sub-district in the cell group;

Be the main CCE collection of said CCE collection of said cell allocation as said sub-district, the main CCE collection of distributing to different districts in the said cell group does not overlap mutually; Distribute to the auxilliary CCE collection of (n-1) individual CCE collection of other users in the said cell group as said sub-district;

Said Cell Edge User is distributed in said main CCE fund-raising source, said Cell Center User is distributed in said auxilliary CCE fund-raising source.

2. the method for claim 1 is characterized in that, is being the main CCE collection of said CCE collection of said cell allocation as said sub-district, and the main CCE collection of distributing to different districts in the said cell group does not overlap mutually; Distribute to after other users' in the said cell group the auxilliary CCE collection of (n-1) individual CCE collection, also comprise as said sub-district:

The transmitting power that said sub-district master CCE collection and auxilliary CCE concentrate each CCE is set, and the transmitting power that said main CCE collection is set is higher than the transmitting power of said auxilliary CCE collection; The identical transmitting power of CCE in the CCE continuation subset is set, and the CCE that belongs in the different CCE continuation subsets has distinct transmit power.

3. method as claimed in claim 2 is characterized in that, said Cell Edge User is distributed in said main CCE fund-raising source, and said Cell Center User is distributed in said auxilliary CCE fund-raising source, also comprises before:

According to the transmitting power of Reference Signal Received Power RSRP and the said sub-district master CCE collection and the auxilliary CCE collection of said sub-district that receives and adjacent sub-district, calculate said community user respectively at the Signal to Interference plus Noise Ratio SINR of main CCE collection with at the SINR of auxilliary CCE collection;

In said sub-district master CCE collection and auxilliary CCE collection, search the PDCCH Candidate Set, obtain the major-minor alternative AL collection { AL} of said community user respectively; Major-minor alternative AL collection { AL} according to the said community user that obtains; Corresponding target door limit value

is wherein on major-minor CCE collection to obtain said community user respectively; In the said target door limit value

; AL belongs to said major-minor alternative AL collection, and { AL}, DCI are the type of Downlink Control Information DCI;

The SINR of more said main CCE collection and said target door limit value corresponding on main CCE collection The SINR of more said auxilliary CCE collection and said at the target door limit value of assisting correspondence on the CCE collection

When satisfying inequality Obtaining AL respectively is the last AL that supports of SINR of said main CCE collection and auxilliary CCE collection, and obtains the minimum AL of said user on said main CCE collection _Min, obtain the minimum AL of said user on said auxilliary CCE collection _Min

4. method as claimed in claim 3 is characterized in that, according to the said sub-district RSRP of said reporting of user the user in the said sub-district is divided into said Cell Edge User and said Cell Center User;

Said Cell Edge User is distributed in said main CCE fund-raising source, said Cell Center User is distributed in said auxilliary CCE fund-raising source, specifically comprise:

When said user is Cell Edge User, according to the AL on said main CCE collection _MinOrder from small to large sorts to said Cell Edge User, concentrates and belongs in the CCE continuation subset of said Cell Edge User PDCCH Candidate Set at main CCE, judges whether to exist to be of a size of said AL _MinIdle CCE resource, if having with said AL _MinSaid Cell Edge User is given in corresponding CCE resource allocation, otherwise jumps to next Cell Edge User;

When said user is Cell Center User, according to the AL on said auxilliary CCE collection _MinOrder from small to large sorts to said Cell Center User, concentrates and belongs in the CCE continuation subset of said Cell Center User PDCCH Candidate Set at auxilliary CCE, judges whether to exist to be of a size of said AL _MinIdle CCE resource, if having with said AL _MinSaid Cell Center User is given in corresponding CCE resource allocation, otherwise jumps to next Cell Center User.

5. method as claimed in claim 4; It is characterized in that; Said Cell Edge User is distributed in said main CCE fund-raising source, said Cell Center User is distributed in said auxilliary CCE fund-raising source, also comprise afterwards judging whether to exist remaining main CCE fund-raising source or auxilliary CCE fund-raising source;

There is remaining main CCE fund-raising source when judging; And when confirming to exist the Cell Center User in unallocated auxilliary CCE fund-raising source; Sort according to the Cell Center User of service quality QoS priority order from high to low to said unallocated auxilliary CCE fund-raising source; Concentrate and belong in the CCE continuation subset of said Cell Center User PDCCH Candidate Set at main CCE, judge whether to exist to be of a size of said AL _MinIdle CCE resource, if having with said AL _MinThe Cell Center User in said unallocated auxilliary CCE fund-raising source is given in corresponding CCE resource allocation, otherwise jumps to the Cell Center User in next unallocated auxilliary CCE fund-raising source; There is not remaining main CCE fund-raising source when judging, and when confirming to have the Cell Center User in unallocated auxilliary CCE fund-raising source, the Cell Center User in said unallocated auxilliary CCE fund-raising source is blocked processing;

There is remaining auxilliary CCE fund-raising source when judging; And when confirming to exist the Cell Edge User in unallocated main CCE fund-raising source; Sort according to the Cell Edge User of QoS priority order from high to low to said unallocated main CCE fund-raising source; Concentrate and belong in the CCE continuation subset of said Cell Edge User PDCCH Candidate Set at auxilliary CCE, judge whether to exist to be of a size of said AL _MinIdle CCE resource, if having with said AL _MinThe Cell Edge User in said unallocated main CCE fund-raising source is given in corresponding CCE resource allocation, otherwise jumps to the Cell Edge User in next unallocated main CCE fund-raising source; There is not remaining said auxilliary CCE fund-raising source when judging, and when confirming to have the Cell Edge User in unallocated said main CCE fund-raising source, the Cell Edge User in said unallocated main CCE fund-raising source is blocked processing;

Said QoS grade is one or more in said user's propagation delay time requirement, the fairness parameter.

6. the device of a physical downlink control channel PDCCH resource allocation is characterized in that, is applied to comprise in the communication system of a plurality of sub-districts, is Cell Edge User in a plurality of sub-districts or Cell Center User distribution PDCCH resource, and this device comprises:

Divide module; Be used for being used for each cell edge resource requirement ratio of current PDCCH transmission according to the cell edge blocking rate estimation of last subframe PDCCH transmission; And be n disjoint CCE collection according to said demand percentage with said PDCCH resource division, n is the number of sub-district in the cell group;

Configuration module is used for said a plurality of CCE collection of obtaining according to said division Module Division, is the main CCE collection of said CCE collection of said cell allocation as said sub-district, and the main CCE collection of distributing to different districts in the said cell group does not overlap mutually; Distribute to the auxilliary CCE collection of (n-1) individual CCE collection of other users in the said cell group as said sub-district;

Resource distribution module is used for said Cell Edge User is distributed in said main CCE fund-raising source, and said Cell Center User is distributed in said auxilliary CCE fund-raising source.

7. device as claimed in claim 6; It is characterized in that; Said device also comprises module is set, and is used to be provided with the transmitting power that said sub-district master CCE collection and auxilliary CCE concentrate each CCE, and the transmitting power that said main CCE collection is set is higher than the transmitting power of said auxilliary CCE collection; The identical transmitting power of CCE in the CCE continuation subset is set, and the CCE that belongs in the different CCE continuation subsets has distinct transmit power.

8. device as claimed in claim 7; It is characterized in that; Said device also comprises computing module; Be used for according to the said sub-district and the RSRP of adjacent sub-district and the transmitting power of said sub-district master CCE collection and auxilliary CCE collection that receive, calculate said community user respectively at the SINR of main CCE collection with at the SINR that assists the CCE collection;

Said device also comprises acquisition module, is used in said sub-district master CCE collection and auxilliary CCE collection, searching the PDCCH Candidate Set, obtains the major-minor alternative AL collection { AL} of said community user respectively; And according to the major-minor alternative AL collection { AL} of the said community user that obtains; Corresponding target door limit value is wherein on major-minor CCE collection to obtain said community user respectively; In the said target door limit value

; AL belongs to said major-minor alternative AL collection, and { AL}, DCI are the type of Downlink Control Information DCI;

Said acquisition module also is used for, the SINR of more said main CCE collection and said said target door limit value corresponding on main CCE collection The SINR of more said auxilliary CCE collection and said at the target door limit value of assisting correspondence on the CCE collection

When satisfying inequality

Obtaining AL respectively is the last AL that supports of SINR of said main CCE collection and auxilliary CCE collection, and obtains the minimum AL of said user on said main CCE collection _Min, obtain the minimum AL of said user on said auxilliary CCE collection _Min

9. device as claimed in claim 8 is characterized in that, said division module also is used for, and according to the said sub-district RSRP of said reporting of user the user in the said sub-district is divided into said Cell Edge User and said Cell Center User;

Said resource distribution module specifically comprises judges submodule and distribution sub module;

When said user is Cell Edge User, according to the AL on said main CCE collection _MinOrder from small to large sorts to said Cell Edge User, and said judgement submodule is concentrated and belonged in the CCE continuation subset of said Cell Edge User PDCCH Candidate Set at main CCE, judges whether to exist to be of a size of said AL _MinIdle CCE resource, when judged result when being, said distribution sub module is with said AL _MinSaid Cell Edge User is given in corresponding CCE resource allocation, otherwise jumps to next Cell Edge User;

When said user is Cell Center User, according to the AL on said auxilliary CCE collection _MinOrder from small to large sorts to said Cell Center User, and said judgement submodule is concentrated and belonged in the CCE continuation subset of said Cell Center User PDCCH Candidate Set at auxilliary CCE, judges whether to exist to be of a size of said AL _MinIdle CCE resource, when judged result when being, said distribution sub module is with said AL _MinSaid Cell Center User is given in corresponding CCE resource allocation, otherwise jumps to next Cell Center User.

10. device as claimed in claim 9; It is characterized in that; Said resource distribution module also comprises judges submodule, distribution sub module and processing sub, and said judgement submodule specifically is used for, and judges whether to exist remaining main CCE fund-raising source or auxilliary CCE fund-raising source;

Judge at said judgement submodule and to have remaining main CCE fund-raising source; And when confirming to exist the Cell Center User in unallocated auxilliary CCE fund-raising source; Sort according to the Cell Center User of QoS priority order from high to low to said unallocated auxilliary CCE fund-raising source; Said judgement submodule is concentrated and is belonged in the CCE continuation subset of said Cell Center User PDCCH Candidate Set at main CCE, judges whether to exist to be of a size of said AL _MinIdle CCE resource, when judged result when being, said distribution sub module is with said AL _MinThe Cell Center User in said unallocated auxilliary CCE fund-raising source is given in corresponding CCE resource allocation, otherwise jumps to the Cell Center User in next unallocated auxilliary CCE fund-raising source; Judge when said judgement submodule and not have remaining main CCE fund-raising source, and when confirming to have the Cell Center User in unallocated auxilliary CCE fund-raising source, said processing sub is blocked processing to the Cell Center User in said unallocated auxilliary CCE fund-raising source;

Judge when said judgement submodule and to have remaining auxilliary CCE fund-raising source; And when confirming to exist the Cell Edge User in unallocated main CCE fund-raising source; Sort according to the Cell Edge User of QoS priority order from high to low to said unallocated main CCE fund-raising source; Said judgement submodule is concentrated and is belonged in the CCE continuation subset of said Cell Edge User PDCCH Candidate Set at auxilliary CCE, judges whether to exist to be of a size of said AL _MinIdle CCE resource, when judged result when being, said distribution sub module is with said AL _MinThe Cell Edge User in said unallocated main CCE fund-raising source is given in corresponding CCE resource allocation, otherwise jumps to the Cell Edge User in next unallocated main CCE fund-raising source; Judge when said judgement submodule and not have remaining auxilliary CCE fund-raising source, and when confirming to have the Cell Edge User in unallocated main CCE fund-raising source, said processing sub is blocked processing to the Cell Edge User in said unallocated main CCE fund-raising source;

Said QoS grade is one or more in said user's propagation delay time requirement, the fairness parameter.

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