CN102196566A - Method and device for selecting carrier in mobile communication system and user equipment - Google Patents

Abstract

The embodiment of the invention discloses a method and device for selecting a carrier in a mobile communication system and a user equipment. The method includes: according to the amount of idle service resources of each carrier, selecting a first set of carriers whose sum of the amount of idle service resources can meet the service resource requirements of a user equipment UE, and the first set of carriers is used to carry the service information of the UE; according to the second The amount of idle control resources of each carrier in a carrier set, the second set of carriers whose sum of idle control resources can meet the control resource requirements of the UE is selected from the first set of carriers, and the second set of carriers is used to carry the control resources of the UE information. Applying the present invention can save network resources.

Description

Method and device for selecting carrier in mobile communication system and user equipment

technical field

The present invention relates to the technical field of mobile communication, in particular to a method and device for selecting a carrier in a mobile communication system and a user equipment (UE).

Background technique

In order to meet the requirements of various services, the new generation wireless communication system should be able to provide a high transmission rate of 1Gbps, which requires a larger bandwidth for information transmission. However, due to the constraints of actual conditions, it is impossible to plan a large section of continuous spectrum. At present, the problem of transmission bandwidth is solved by aggregating spectrum in different frequency bands. This technology aggregates multiple discontinuous spectrum to serve user equipment (UE) It is called carrier aggregation (Carrier Aggregation, CA) technology.

FIG. 1 is a schematic diagram of carrier aggregation.

As shown in FIG. 1 , a base station (eNB) aggregates three carriers in total, namely carrier A, carrier B and carrier C. Each aggregated carrier is called a component carrier (Component Carrier, CC), for example, carrier A is the component carrier. In order to be compatible with LTE R8 UEs, the maximum bandwidth of each CC does not exceed 20MHz. The UE in the LTE-A system can transmit information on a single CC or on multiple CCs according to the traffic volume, while the UE in the LTE system can only transmit information on a single CC.

Although using multiple CCs to serve a UE at the same time can increase the data transmission rate, the demand for control channel resources will increase accordingly.

The Physical Downlink Control Channel (PDCCH) carries downlink control information (Downlink Control Information, DCI), such as scheduling information for downlink data transmission, scheduling information for uplink data transmission, and response/non-response to uplink data ( ACK/NACK) information. If multiple CCs are used to serve the same UE, the PDCCH contains the control signaling information of multiple CCs, and the size of the control signaling will increase in approximate multiples as the number of CCs increases.

The UE blindly detects the PDCCH on the CC that serves it. When multiple CCs serve the UE, if the PDCCH is blindly detected on each CC, it will cause a waste of network resources, and the implementation complexity of the UE is also high. , if only the PDCCH is carried on the anchor component carrier (Author CC), and then the PDCCH is blindly detected on the Author CC, since the control signaling carried by the PDCCH is large in size, it is easy to cause PDCCH blocking, which affects the blind detection effect, and then affect the communication quality.

Contents of the invention

In view of this, the purpose of the embodiments of the present invention is to provide a method and device for selecting a carrier in a mobile communication system and a user equipment, so as to save network resources.

In order to achieve the above purpose, the technical solutions of the embodiments of the present invention are specifically implemented as follows:

A method for selecting a carrier in a mobile communication system, the method comprising:

According to the amount of idle service resources of each carrier, select a first set of carriers whose sum of the amount of idle service resources can meet the service resource requirements of the user equipment UE, and the first set of carriers is used to carry the service information of the UE;

According to the amount of idle control resources of each carrier in the first set of carriers, select a second set of carriers whose sum of the amount of idle control resources can meet the control resource requirements of the UE from the first set of carriers, and the second set of carriers is used to carry the UE control information.

A device for selecting a carrier in a mobile communication system, the device comprising a first selection module and a second selection module;

The first selection module selects a first set of carriers whose sum of idle service resources can meet the service resource requirements of the user equipment UE according to the amount of idle service resources of each carrier, and the first set of carriers is used to carry the service information of the UE ;

The second selection module selects from the first carrier set a second carrier set whose sum of idle control resource amounts can meet the UE control resource requirements according to the idle control resource amounts of each carrier in the first carrier set, and the second carrier set The set of carriers is used to bear the control information of the UE.

A user equipment, the UE includes a first receiving module and a second receiving module;

The first receiving module receives service information on carriers in a first carrier set, the first carrier set is selected by the network side according to the amount of idle service resources of each carrier and the service resource requirements of the UE;

The second receiving module receives the control information of each carrier in the first carrier set on a carrier in the second carrier set, and the second carrier set is controlled by the network side according to the idle control resource amount of each carrier in the first carrier set and the UE's control resource requirements are selected.

It can be seen that when the present invention selects a carrier (CC), first, according to the idle service resources of each CC, try to use as few CCs as possible to carry the service information of the UE, thereby reducing the UE's demand for control resources and saving network resources; and , compared with carrying the control information of the CC on each CC in the prior art, the present invention selects some CCs from all the CCs that carry the service information, so that the selected CCs can meet the control resource requirements of the UE. Carrying control information on the selected CC can also reduce the number of times the UE performs blind detection and reduce the complexity of the UE.

Description of drawings

FIG. 1 is a schematic diagram of carrier aggregation.

Fig. 2 is a flowchart of a method for selecting a carrier in the mobile communication system provided by the present invention.

Fig. 3 is a general flowchart of a preferred embodiment of the CC selection method provided by the present invention.

Fig. 4 is a flow chart of a method for selecting a single CC for a UE to transmit service information provided by the present invention.

Fig. 5 is a schematic diagram of the first resource allocation provided by the present invention.

FIG. 6 is a flow chart of a method for selecting multiple CCs for a UE to transmit service information or control information provided by the present invention.

Fig. 7 is a schematic diagram of second resource allocation provided by the present invention.

Fig. 8 is a structural diagram of a device for selecting a carrier in a mobile communication system provided by the present invention.

Fig. 9 is a structural diagram of user equipment provided by the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

Fig. 2 is a flowchart of a method for selecting a carrier in the mobile communication system provided by the present invention.

As shown in Figure 2, the method includes:

Step 201, according to the amount of idle service resources of each carrier, select a first set of carriers whose sum of idle service resources can meet the service resource requirements of the user equipment UE.

The first carrier set selected in this step is used to bear the service information of the UE;

Step 202: According to the amount of idle control resources of each carrier in the first set of carriers, select a second set of carriers from the first set of carriers whose sum of the amounts of idle control resources can meet the control resource requirements of the UE.

The second set of carriers selected in this step is used to bear the control information of the UE.

Wherein, a single carrier whose amount of idle service resources can meet the service resource requirement of the UE may be selected, and the first set of carriers is composed of the selected single carrier.

When there are two or more single carriers whose idle service resources can meet the service resource requirements of the UE, select a single carrier whose idle control resources can meet the UE's control resource requirements from the two or more single carriers, and the first set of carriers and The second carrier set is composed of a single carrier meeting the service resource requirement and the control resource requirement of the UE.

When there are more than two single carriers meeting the service resource requirement and the control resource requirement of the UE, a single carrier for forming the first carrier set and the second carrier set is selected according to the channel quality.

When there is no single carrier whose idle service resources can meet the service resource requirements of the UE, the carriers are selected in descending order of the idle service resources until the sum of the idle service resources of all the selected carriers can meet the UE service requirements. Resource requirements, the first set of carriers is composed of all the selected carriers.

A single carrier whose amount of idle control resources can satisfy the control resources required by the UE is selected from the first set of carriers, and the second set of carriers is composed of the selected single carrier. Specifically, it is judged whether there is a current idle control resource amount of a single carrier in each carrier of the first carrier set to meet the control resources required by the UE, if yes, select the single carrier, if not, increase the number of idle control resources of the carriers in the first carrier set The amount of currently idle control resources returns to the action of the judgment. The selected idle control resource amount of the single carrier is updated to the increased idle control resource amount, and the idle control resource amounts of other carriers in the first carrier set are kept as the idle control resource amount before the increase.

When there is no single carrier whose amount of idle control resources can satisfy the control resources required by the UE, the carriers are selected in descending order of the amount of idle control resources until the sum of the amount of idle control resources of all the selected carriers can meet the requirements of the UE. The required control resource consists of all the selected carriers forming the second carrier set.

When the sum of the current idle control resources of all carriers in the first carrier set cannot meet the control resources required by the UE, increase the current idle control resources of the carriers in the first carrier set, and use the increased idle control resources by Carriers are selected in descending order until the sum of idle control resources of all selected carriers can meet the control resources required by the UE, and all the selected carriers form the second carrier set.

When the sum of the current idle control resource amounts of all carriers in the first carrier set cannot satisfy the control resources required by the UE, update the idle control resource amounts of the carriers in the second carrier set to the increased idle control resource amounts, The amount of idle control resources of the carriers other than the second set of carriers in the first set of carriers is kept as the amount of idle control resources before the increase.

Specifically, the present invention increases the idle control resource of the carrier by increasing the OFDM symbol time of the carrier.

The initial resource block RE number of the control resource of the carrier in the second carrier set occupied by the control information of the carrier in the first carrier set is an integer multiple of the number of resources corresponding to the control information, and the control information of one carrier in the first carrier set is continuously carried In the control resource of a carrier in the second set of carriers.

The carrier number and control information of a carrier in the first carrier set are continuously carried in the control resource of a carrier in the second carrier set, so that the UE can identify which carrier the control information is for.

The present invention not only considers the system performance gain brought by the CA technology, but also considers its implementation complexity, and makes a compromise between the system performance gain and the implementation complexity. The specific method is to first select the bearer service according to the service resource demand of the UE The first carrier set of information, also known as the downlink CC set, reduces the UE's demand for control resources by selecting as few CCs as possible to carry service information, and then selects the second carrier set from the downlink CC set to carry the UE's Control information. The second carrier set can also be called the PDCCH monitoring set. Since the PDCCH monitoring set is a subset of the downlink CC set, usually the UE does not need to perform blind detection on all downlink CCs, and only needs to perform blind detection on the PDCCH monitoring set. It is enough to perform blind detection on the CC in the UE, thereby reducing the implementation complexity of the UE.

When the PDCCH monitoring set is completely included in the downlink CC set, the UE needs to schedule each CC through the cross-carrier scheduling technology, where the cross-carrier scheduling is an existing technology, and will not be described here.

In the present invention, the CC is selected by the network side, usually the base station (NodeB) selects the CC, and the selection of the CC is mainly based on the following principles:

Principle 1: When determining the UE's downlink CC set, according to the idle service resources of each CC, try to use as few CCs as possible to meet the UE's service resource requirements, thereby reducing the UE's demand for control resources.

Principle 2: When determining the PDCCH monitoring set of the UE, according to the idle control resources of each CC in the downlink CC set and the occupied OFDM symbol time, try to make the PDCCH monitoring set without increasing the OFDM symbol time occupied by the control resources. The number of CCs included is the least. If the sum of the idle control resources of all CCs in the downlink CC set does not meet the control resource requirements of the UE, increase the control resources of the CCs in the downlink CC set by increasing the OFDM symbol time occupied by the control resources. domain, and minimize the number of CCs included in the PDCCH monitoring set while increasing the control resource domain as little as possible. By making the PDCCH monitoring set include as few CCs as possible, the times of UE blind detection can be reduced, the complexity of UE implementation can be reduced, and the utilization rate of control resources can be improved at the same time.

Principle 3: When selecting a downlink CC set or a PDCCH monitoring set, if multiple CCs meet the conditions, try to select a CC with good channel quality, so as to improve the reliability of information transmission.

In the CA technology, the amount of control resources required by the UE largely depends on the number of CCs serving the UE, and the number of CCs serving the UE depends on the service resource requirements of the UE. Taking the resource scheduling of the Physical Downlink Share Channel (PDSCH) as an example, if the UE uses two CCs with the same bandwidth to transmit service data, no matter whether the PDCCH is sent on one or two CCs, the DCI information must contain the bitmap (Bitmap) of the time-frequency resource occupancy of each CC, so the control signaling size when two CCs are used to transmit service data will be the control signaling size when one CC is used to transmit service data 2 times, the amount of control resources required by the UE will also be doubled; in addition, from the perspective of UE implementation complexity, for the case of using 2 CCs to transmit service data, if the UE sends PDCCH on each CC separately, then the UE needs Perform PDCCH blind detection on each CC, and the number of blind detections will be twice that of using a single CC to transmit service data.

Based on the above analysis, when the present invention allocates radio resources for the UE, it first allocates service resources, that is, allocates downlink CC sets, and then allocates control resources, that is, allocates PDCCH monitoring sets, and selects from the downlink CC sets The PDCCH monitoring set is such that the PDCCH monitoring set is a subset of the downlink CC set. Preferably, try to select a single CC for service resource transmission and control resource transmission of the UE.

Fig. 3 is a general flowchart of a preferred embodiment of the CC selection method provided by the present invention.

As shown in Figure 3, the method includes:

Step 301 , judging whether storing a single CC satisfies both the UE's service resource requirements and the UE's control resource requirements, if yes, execute step 302 , otherwise execute step 303 .

In step 302, a single CC is selected to serve the UE. If the CC is selected successfully, this procedure ends.

In this step, select a CC to serve the UE from the CCs that meet both the UE's service resource requirements and the UE's control resource requirements, usually based on the channel quality of the CC to ensure the accuracy of information transmission.

Step 303, judging whether the combination of multiple CCs can meet the resource requirements of the UE, if yes, execute step 304, otherwise, CC selection fails, and this process ends.

In this step, it is judged whether the combination of multiple CCs can meet both the service resource requirements of the UE and the control resource requirements of the UE. If all the CCs that the UE can currently use cannot meet the service resource requirements and control resource requirements, CC selection fails.

Step 304, determine the downlink CC set of the UE.

In step 305, a PDCCH monitoring set is selected from the downlink CC set of the UE, and the CC selection is successful, and this process ends.

After the CA technology is introduced into the LTE-A system, the base station (eNB) will still centrally perform resource scheduling. Among them, the resource usage of each CC is recorded in the eNB, and the eNB allocates the transmission service for the UE according to the resource usage of each CC, the quality of service (Qos), traffic volume, wireless channel conditions, and UE capabilities of the user service. CC for information and/or control information.

According to the method in Figure 3, the UE preferentially uses a single CC for service information transmission and control information transmission. If a single CC cannot be used to transmit service information or control information, and the UE has the CA capability, multiple CCs are used to transmit service information or control information. . The method for the UE to transmit service information or control information on a single CC and the method for the UE to transmit service information or control information on multiple CCs will be described respectively below.

Fig. 4 is a flow chart of a method for selecting a single CC for a UE to transmit service information provided by the present invention.

As shown in Figure 4, the method includes:

Step 401: Arrange the CCs in descending order according to the amount of idle service resources, and determine whether there is a CC with idle service resources greater than the service resource requirements of the UE. If so, perform step 402; otherwise, use multiple CCs to provide services for the UE.

Step 402, for the CC selected in step 401, judge whether there is a CC with idle control resources that can meet the control resource requirements of the UE without increasing the size of the CC control resource domain, if yes, perform step 403, if not, perform Step 404.

In this step, the control resource domain of the CC=carrier bandwidth of the CC×OFDM symbol time occupied by the CC.

Step 403: Select a CC from the CCs that meet both the UE's service resource requirements and the UE's control resource requirements to transmit the UE's service information and control information.

In this step, if there are multiple CCs that meet both the service resource requirements of the UE and the control resource requirements of the UE, a CC with better channel quality is selected from the multiple CCs to improve the information transmission accuracy of the UE.

Step 404, for the CC selected in step 401, judge whether there is a CC that can meet the UE's control resource requirements under the condition of increasing the size of the CC control resource field, if yes, perform step 405, if not, use multiple CCs as the UE Provide services.

Step 405: Select the CC with the smallest increase in the control resource field from the CCs that meet the UE's control resource requirements to provide services for the UE,

In this step, if there are multiple CCs that meet both the service resource requirements of the UE and the control resource requirements of the UE after increasing the control resource domain, select the CC with the smallest increase in the control resource domain from the multiple CCs. If the increase of the control resource area of two or more CCs is the smallest, the CC with the best channel quality is selected from the two or more CCs as the final serving CC of the UE.

The following uses FIG. 5 as an example to illustrate the method of selecting a single CC for the transmission of service information and control information.

Fig. 5 is a schematic diagram of the first resource allocation provided by the present invention.

In Figure 5, the eNB has aggregated 3 CCs including Carrier A, Carrier B and Carrier C. The allocation of control resources and service resources of each CC is represented by a giant with a different mark: with a 45-degree tilt to the left Rectangles with diagonal lines represent occupied control resources, circled rectangles represent unoccupied control resources, blank rectangles represent occupied service resources, curved rectangles represent unoccupied service resources, and red arrows represent PDCCH Indication relationship with PDSCH. It is worth noting that the idle resources and occupied resources referred to here do not include the Resource Element (RE) corresponding to the time-frequency grid where the Reference Signal (RS) is located. In addition, in order to reduce the complexity of UE blind detection in LTE, there are certain rules for PDCCH resource mapping, that is, the RE number at the starting position must be an integer multiple of the number of resources corresponding to PDCCH. Therefore, within the overall control resources, both occupied resources and unoccupied resources are discretely distributed. There are two kinds of resource mapping of PDSCH in LTE: centralized mapping and distributed mapping, and the resource allocation situation is indicated through Bitmap. In order to clearly show the allocation of resources, the occupied resources and unoccupied resources in Figure 5 are represented by continuous resources, and those skilled in the art should be able to understand that both occupied resources and unoccupied resources in practical applications may be discontinuously distributed And, when transmitting PDCCHs on discontinuously distributed unoccupied control resources, each PDCCH can only be borne on a segment of continuous control resources, and the RE number of the starting position occupied by each PDCCH on the control resources should be the The PDCCH corresponds to an integer multiple of the number of resources.

In Fig. 5, the eNB selects a CC for the UE according to the resource requirements of the UE and the available resources of the three CCs. First, comparing the service resource requirements of the UE with the idle service resources of the three CCs, it is found that the idle service resources of carriers B and C are greater than the service resource requirements of the UE. Next, carrier B and carrier C are further screened to find a CC that satisfies the control resource requirements of the UE.

Between carriers B and C, if carrier C is selected, additional OFDM symbol time needs to be added for control resources, that is, the control resource field of carrier C can be increased to meet the control resource requirements of the UE, without increasing the control resources of carrier B. The resource domain can meet the control resource requirements of the UE, so the carrier B is selected as the serving CC of the UE, thus completing the CC selection process.

Wherein, the control resource part of the carrier is variable in time, may occupy 1, 2 or 3 OFDM symbol time, and the OFDM symbol time occupied by the carrier is indicated by PCFICH. In the part of control resources, the OFDM symbol time that does not send control messages can be mapped to PDSCH, so when performing CC selection based on control resources, it is better not to increase the OFDM symbol time.

According to the regulations of 3GPP, in the CA technology, when a single carrier is used to serve the UE, it can be backward compatible with LTE R8 UEs, avoiding cross-carrier scheduling (Cross-Carrier Scheduling) and improving system compatibility. The cross-carrier scheduling means that the PDSCH is mapped to one CC, and the PDCCH is mapped to another different CC.

FIG. 6 is a flow chart of a method for selecting multiple CCs for a UE to transmit service information or control information provided by the present invention.

First, define a set of CCs that serve the UE in the downlink direction as a "downlink CC set". The "downlink CC set" is UE-specific, that is, there is one such set for each UE transmitting CA, and the "downlink CC set" of different UEs may be different. If the UE's PDSCH on each CC is indicated by the PDCCH on the same CC, the number of blind detections required by the UE is proportional to the number of CCs in the "downlink CC set", resulting in a large increase in the number of blind detections, and complicated UE implementation. higher degree. If the PDCCHs of all CCs in the UE's "downlink CC set" are transmitted on the anchor carrier (Anchor CC), the blind detection of the UE only needs to be performed on the Anchor CC, which can significantly reduce the number of blind detections, but use the Anchor CC to carry all The PDCCH on the CC will increase the blocking probability of the PDCCH, that is, the success rate of allocating a large number of PDCCH resources on a single CC is not high, and the more the number of CCs in the downlink CC set, the greater the blocking probability of the PDCCH.

Based on the above considerations, the present invention introduces a PDCCH monitoring set. The PDCCH monitoring set is a subset of the downlink CC set. The PDCCH for CA transmission by the UE is transmitted on the CCs in the PDCCH monitoring set. Therefore, when the UE transmits on multiple CCs, the main task of the eNB is to determine the UE's downlink CC set and PDCCH monitoring set, so as to flexibly achieve a compromise between blind detection complexity and PDCCH blocking probability.

Referring to Figure 6, the method includes:

In step 601, the eNB arranges the CCs in descending order according to the amount of idle service resources in descending order.

In step 602, the eNB allocates service resources to UEs in descending order on the sorted CCs until sufficient service resources are allocated to the UEs.

In this step, how many service resources are specifically allocated to the UE to meet the needs of the UE depends on the service volume of the UE and parameters such as channel conditions and Qos.

In this step, if the service resource requirements of the UE can be met, then all the CCs that provide service resources for the UE together constitute the downlink CC set of the UE. So far, the downlink CC set of the UE is determined. If all the CCs of the eNB cannot be combined If the service resource requirements of the UE are met, the CC selection fails, and this process ends.

After the UE's downlink CC set is determined, the next task is to determine the UE's PDCCH monitoring set. When determining the PDCCH monitoring set of the UE, in order to reduce the number of blind detections of the UE, the PDCCH monitoring set of the UE should be kept as small as possible.

It is assumed that there are m CCs in the downlink CC set of the UE, the bandwidth of each CC is W _i (i=1, 2, ..., m), and the amount of idle control resources is K _i (i=1, 2, ..., m), and the occupied OFDM symbol times are S _i (1≤S _i ≤3, i=1, 2, ..., m). Each CC in the PDCCH monitoring set of the UE needs PDCCH resources to indicate the resource allocation of the PDSCH. It is assumed that the control resource demand of each CC indicating the PDSCH resources allocated to the current UE is R _i (i=1, 2 ,..., m). The present invention determines the PDCCH monitoring set of the UE according to K ₁ , K ₂ , ..., K _m and R ₁ , R ₂ , ..., R _m , and allocates the PDCCH monitoring set for the UE on the CC with more idle control resources preferentially. It is necessary to control resources to keep the size of the UE's PDCCH monitoring set to a minimum, please refer to steps 603-608 for details.

In step 603, the eNB respectively arranges K ₁ , K ₂ , ..., K _m and R ₁ , R ₂ , ..., R _m in descending order.

Step 604 , filling the sorted R ₁ , R ₂ , . . . , R _m into the descending sorted K _i (i=1, 2, .

In this step, the sorted R ₁ , R _{2 , .} Among them, the knapsack algorithm is a prior art, and will not be described here.

In the process shown in Figure 6, step 604 is executed for the first time under the condition that the idle control resources of each CC remain unchanged. If none of them can meet the control resource requirements of the UE, it is necessary to increase the idle control resources of the CCs by performing steps 606 to 608, and then re-determine whether the CCs in the downlink CC set can meet the control resource requirements of the UE.

When increasing the idle control resources of the CCs, if the CCs in the downlink CC set can meet the control resource requirements of the UE, then for K _i filled with R _i (i=1, 2, ..., m) ( _i =1 _, 2, . . . , m) for K _i (i=1, 2, . . . , m), keep the K _i (i=1, 2, . . . , m) as the initial value.

Step 605, judging whether Σ _i=1 ^m K _i can meet the requirement of Σ _i=1 ^m R _i , if yes, then select the K _{i (} The CC corresponding to i=1, 2,..., m) is used to send the PDCCH, that is, the K _{i (} i=1, 2, ..., the CCs corresponding to m) form a PDCCH monitoring set, and end this process; otherwise, execute step 606.

In step 606, it is judged whether S _i <3 (i=1, 2, .

Step 607, update S _i .

In this step, for S _i less than 3, set S _i ′=S _i +1 (i=1, 2,...,m), update S _i with S _i ′, and keep S _i equal to 3 unchanged .

Step 608, using W _i and S _i updated in step 607 to recalculate the idle control resources K _i ' (i=1, 2, ..., m) of each CC in the UE's downlink CC set, using K _i '( i=1, 2, . . . , m) update K _i (i=1, 2, . . . , m), return to step 603 .

In Figure 6, for the CCs corresponding to the sorted K _i (i=1, 2, ..., m), use the backpack algorithm in order from large to small to combine R ₁ , R ₂ , ..., R _m The purpose of filling it is to allocate as many resources as possible for the UE on the CC, so as to ensure that the PDCCH monitoring set of the UE is the smallest. The end condition is that the allocation of control resources required by the UE is completed or K _i (i=1, 2, .. ., m) is traversed. If _the control resources required by the UE are allocated successfully, the PDCCH monitoring set of the UE is determined; The selection process failed. It should be noted that when filling R ₁ , R ₂ , _.

The following uses FIG. 7 as an example to describe a method for selecting multiple CCs for transmission of service information and control information.

Fig. 7 is a schematic diagram of second resource allocation provided by the present invention.

The representation method of business resources in Fig. 7 is the same as that in Fig. 5 .

In the case of resource allocation in FIG. 7 , service resources are firstly allocated to the UE. In FIG. 7 , the order of idle service resources of the three carriers from large to small is carrier C>carrier B>carrier A. Therefore, starting from carrier C, service resource carriers are allocated to UEs in sequence. Through calculation, it is found that carrier C and carrier B can jointly meet the service resource requirements of the UE, so the downlink CC set of the UE is determined to be {carrier C, carrier B}.

Next, control resources are allocated to the UE on carrier C and carrier B. According to the control resource requirements of the UE and the idle control resources of carriers C and B, it is found that carrier B can meet the control resource requirements of the UE without increasing the number of OFDM symbols occupied by the control resources, so the PDCCH monitoring of the UE is determined The set is {carrier B}, that is, the service resources allocated by carrier B and carrier C for the UE are scheduled on carrier B. So far, the entire resource allocation process for the UE is completed.

Fig. 8 is a structural diagram of a device for selecting a carrier in a mobile communication system provided by the present invention.

As shown in FIG. 8 , the device includes a first selection module 801 and a second selection module 802 .

The first selection module 801 selects a first set of carriers whose sum of idle service resources can meet service resource requirements of a user equipment UE according to the amount of idle service resources of each carrier, and the first set of carriers is used to carry service information of the UE.

The second selection module 802, according to the amount of idle control resources of each carrier in the first set of carriers, selects from the first set of carriers a second set of carriers whose sum of the amount of idle control resources can meet the control resource requirements of the UE, the second carrier The set is used to bear the control information of the UE.

The first selection module 801 may select a single carrier whose amount of idle service resources can meet the service resource requirements of the UE, and form a first carrier set from the selected single carrier.

The first selection module 801 may also select carriers in descending order of idle service resources when there is no single carrier whose amount of idle service resources can meet the service resource requirements of the UE, until the selected idle service resources of all carriers are The sum of the amount of resources can meet the service resource requirements of the UE, and all the selected carriers form the first carrier set.

The second selection module 802 selects a single carrier whose amount of idle control resources can satisfy the control resources required by the UE from the first set of carriers, and the second set of carriers consists of the selected single carrier.

The second selection module 802 may select carriers in descending order of the amount of idle control resources when there is no single carrier whose amount of idle control resources can satisfy the control resources required by the UE, until the idle control of all the selected carriers The sum of the amount of resources can satisfy the control resources required by the UE, and all the selected carriers form the second carrier set.

The second selection module 802 may also increase the current idle control resources of the carriers in the first carrier set when the sum of the current idle control resources of all carriers in the first carrier set cannot meet the control resources required by the UE, and increase the After the large amount of idle control resources, carriers are selected in order from large to small, until the sum of the idle control resource amounts of all selected carriers can meet the control resources required by the UE, and the second carrier is composed of all the selected carriers gather.

Generally, the device described in FIG. 8 is set in the eNB.

The present invention also provides a user equipment supporting the method of the present invention and the apparatus shown in FIG. 8 , please refer to FIG. 9 for details.

Fig. 9 is a structural diagram of user equipment provided by the present invention.

As shown in FIG. 9 , the user equipment includes a first receiving module 901 and a second receiving module 902 .

The first receiving module 901 receives service information on carriers in a first carrier set, the first carrier set is selected by the network side according to the amount of idle service resources of each carrier and the service resource requirement of the UE.

The second receiving module 902 is configured to receive the control information of each carrier in the first carrier set on a carrier in the second carrier set, and the second carrier set is controlled by the network side according to the amount of idle control resources of each carrier in the first carrier set and The UE's control resource requirements are selected.

The second receiving module 902 receives control information of each carrier in the first carrier set by performing blind detection on each carrier in the second carrier set.

The above is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall include Within the protection scope of the present invention.

Claims (22)

1. select the method for carrier wave in the mobile communication system, it is characterized in that this method comprises:

According to the idle traffic stock number of each carrier wave, select idle traffic stock number sum can satisfy the first carrier set of user equipment (UE) service resources demand, this first carrier is gathered the business information that is used to carry this UE;

According to the free time control stock number of each carrier wave in the first carrier set, from this first carrier set, select idle control stock number sum can satisfy second carrier set of UE control resource requirement, this second carrier set is used to carry the control information of this UE.

2. method according to claim 1 is characterized in that, the first carrier set that described selection idle traffic stock number sum can satisfy UE service resources demand comprises:

Select the idle traffic stock number can satisfy the single carrier wave of UE service resources demand, the first carrier set is made up of a single carrier wave of selecting.

3. method according to claim 2, it is characterized in that, when the idle traffic stock number that has plural single carrier wave can satisfy UE service resources demand, select idle control resource can satisfy the single carrier wave of this UE control resource requirement from this plural single carrier wave, the first carrier set and second carrier set are made up of a single carrier wave that satisfies this UE service resources demand and control resource requirement.

4. method according to claim 3, it is characterized in that, when the number of the single carrier wave that satisfies this UE service resources demand and control resource requirement at two when above, therefrom select to be used to form the single carrier wave of the first carrier set and second carrier set according to channel quality.

5. method according to claim 2 is characterized in that,

When not existing the idle traffic stock number can satisfy the single carrier wave of UE service resources demand, select carrier wave successively according to the order that the idle traffic stock number is descending, idle traffic stock number sum until all carrier waves of selecting can satisfy UE service resources demand, forms this first carrier set by all carrier waves of selecting.

6. method according to claim 5 is characterized in that, described second carrier set of selecting idle control stock number sum can satisfy UE control resource requirement from this first carrier set comprises:

Select idle control stock number can satisfy the single carrier wave of the required control resource of UE from the first carrier set, second carrier set is made up of a single carrier wave of selecting.

7. method according to claim 6 is characterized in that, the described single carrier wave of selecting idle control stock number can satisfy UE control resource requirement from the first carrier set comprises:

Whether judge in each carrier wave of first carrier set exists the current idle control stock number of single carrier wave to satisfy the required control resource of UE, if select this single carrier wave, if not, increase the current idle control stock number of carrier wave in the first carrier set, return the action of described judgement.

8. method according to claim 7 is characterized in that,

The free time control stock number of this single carrier wave of selecting is updated to free time control stock number after the increase, the free time control stock number of other carrier waves in the first carrier set is remained free time control stock number before increasing.

9. method according to claim 6 is characterized in that,

When not existing idle control stock number can satisfy the single carrier wave of the required control resource of UE, select carrier wave successively according to the descending order of free time control stock number, can satisfy the required control resource of UE until the free time of all carrier waves of selecting control stock number sum, form this second carrier set by all carrier waves of selecting.

10. method according to claim 9 is characterized in that,

When the current idle control stock number sum of all carrier waves all can not satisfy the required control resource of UE in first carrier set, increase the current idle control resource of carrier wave in the first carrier set, select carrier wave successively according to the descending order of free time control stock number after increasing, can satisfy the required control resource of UE until the free time of all carrier waves of selecting control stock number sum, form this second carrier set by these all carrier waves of selecting.

11. method according to claim 10 is characterized in that,

When the current idle control stock number sum of all carrier waves all can not satisfy the required control resource of UE in first carrier set, free time of the carrier wave in second carrier set control stock number is updated to free time control stock number after the increase, the free time control stock number of the carrier wave except that second carrier set in the first carrier set is remained increases the preceding free time and control stock number.

12. according to claim 7 or 8 or 10 or 11 described methods, it is characterized in that,

Increase the free time control resource of this carrier wave by the OFDM symbol time that increases carrier wave.

13., it is characterized in that the control information that this second carrier set is used to carry this UE comprises according to the described method of the arbitrary claim of claim 1 to 11:

The initial Resource Block RE numbering of the control resource of carrier wave is the integral multiple of the corresponding number of resources of this control information in second carrier set that the control information of carrier wave takies in the first carrier set, in the first carrier set in the control resource of control information continuous bearing carrier wave in second carrier set of a carrier wave.

14. method according to claim 13 is characterized in that, in the first carrier set in the control resource of the carrier index of a carrier wave and control information continuous bearing carrier wave in second carrier set.

15. select the device of carrier wave in the mobile communication system, it is characterized in that this device comprises that first selects module and second to select module;

Described first selects module, according to the idle traffic stock number of each carrier wave, selects idle traffic stock number sum can satisfy the first carrier set of user equipment (UE) service resources demand, and this first carrier is gathered the business information that is used to carry this UE;

Described second selects module, free time control stock number according to each carrier wave in the first carrier set, select idle control stock number sum can satisfy second carrier set of UE control resource requirement from this first carrier set, this second carrier set is used to carry the control information of this UE.

16. device according to claim 15 is characterized in that,

Described first selects module, selects the idle traffic stock number can satisfy the single carrier wave of UE service resources demand, forms the first carrier set by a single carrier wave of selecting.

17. device according to claim 16 is characterized in that,

Described first selects module, when not existing the idle traffic stock number can satisfy the single carrier wave of UE service resources demand, select carrier wave successively according to the order that the idle traffic stock number is descending, idle traffic stock number sum until all carrier waves of selecting can satisfy UE service resources demand, forms the first carrier set by all carrier waves of selecting.

18. device according to claim 17 is characterized in that,

Described second selects module, selects idle control stock number can satisfy the single carrier wave of the required control resource of UE from the first carrier set, and second carrier set is made up of a single carrier wave of selecting.

19. device according to claim 18 is characterized in that,

Described second selects module, when not existing idle control stock number can satisfy the single carrier wave of the required control resource of UE, select carrier wave successively according to the descending order of free time control stock number, can satisfy the required control resource of UE until the free time of all carrier waves of selecting control stock number sum, form this second carrier set by all carrier waves of selecting.

20. device according to claim 19 is characterized in that,

Described second selects module, when the current idle control stock number sum of all carrier waves all can not satisfy the required control resource of UE in first carrier set, increase the current idle control resource of carrier wave in the first carrier set, select carrier wave successively according to the descending order of free time control stock number after increasing, can satisfy the required control resource of UE until the free time of all carrier waves of selecting control stock number sum, form this second carrier set by these all carrier waves of selecting.

21. a user equipment (UE) is characterized in that, this UE comprises first receiver module and second receiver module;

Described first receiver module receives business information on the carrier wave in the first carrier set, and described first carrier set is selected according to the idle traffic stock number of each carrier wave and the service resources demand of this UE by network side;

Described second receiver module, receive the control information of each carrier wave in the first carrier set on the carrier wave in second carrier set, described second carrier set is selected according to the free time control stock number of each carrier wave in the first carrier set and the control resource requirement of this UE by network side.

22. UE according to claim 21 is characterized in that,

Described second receiver module by carrying out blind Detecting on each carrier wave in second carrier set, receives the control information of each carrier wave in the first carrier set.

Images