WO2016122108A1

WO2016122108A1 - Method and device for grouping serving cells in multiple component carrier system

Info

Publication number: WO2016122108A1
Application number: PCT/KR2015/013559
Authority: WO
Inventors: 박동현
Original assignee: 주식회사 아이티엘
Priority date: 2015-01-30
Filing date: 2015-12-11
Publication date: 2016-08-04
Also published as: KR102244326B1; KR20160094196A

Abstract

The present specification relates to a method and a device for grouping serving cells in a multiple component carrier system. The present specification provides a method for grouping serving cells by a base station in a multiple component carrier system, the method comprising the steps of: grouping a plurality of component carriers configured for a terminal; and transmitting RRC signaling to the terminal, wherein each of the groups includes a maximum of eight component carriers.

Description

Method and apparatus for grouping serving cells in multi-component carrier system

The present invention relates to wireless communication, and more particularly, to a method and apparatus for grouping serving cells in a multi-component carrier system.

In a typical wireless communication system, even though the bandwidth between uplink and downlink is set differently, only one carrier is considered. In the 3rd Generation Partnership Project (3GPP) long term evolution (LTE), based on a single carrier, the number of carriers constituting uplink and downlink is one, and the bandwidth of the uplink and the downlink are generally symmetrical to each other. to be. In such a single carrier system, wireless communication is performed using one carrier.

However, with the recent introduction of multiple component carrier systems, wireless communication systems require service support through multiple component carriers.

An object of the present invention is to provide a method and apparatus for wireless communication that can reduce overhead of a main serving cell in a multi-carrier system.

Another object of the present invention is to provide a wireless communication method and apparatus for supporting a plurality of component carriers while minimizing a change in an existing physical layer structure.

According to an aspect of the present invention, a method of grouping serving cells of a base station in a multi-component carrier system is provided. The method of grouping the serving cells includes grouping a plurality of component carriers configured in a terminal, and transmitting an RRC signaling to the terminal, wherein each grouping group is at most It is implemented by including eight component carriers.

According to another aspect of the present invention, a method for receiving a signal in a grouped serving cell of a terminal in a multi-component carrier system is provided. The signal receiving method includes receiving an RRC signaling from a base station, wherein each grouping group includes at most eight component carriers.

According to the present invention, by grouping the serving cells in a multi-carrier system, it provides an advantage of reducing overhead in the main serving cell (Pcell). In addition, it provides an advantage of supporting a plurality of component carriers through the same physical layer structure.

1 shows an example of an LAA network environment to which the present invention is applied.

2 illustrates an example in which serving cells are grouped and signaled according to an embodiment of the present invention.

3 shows an example of an activation / deactivation MAC CE structure according to an embodiment of the present invention.

4 shows an example of an activation / deactivation MAC CE structure according to another embodiment of the present invention.

5 and 6 illustrate an example of an activation / deactivation MAC CE structure in which four serving cell groups are grouped according to an embodiment of the present invention.

7 shows an example of a MAC CE structure according to another embodiment of the present invention.

8 illustrates a PHR MAC CE structure according to an embodiment of the present invention.

9 shows an example of a PHR MAC CE structure according to another embodiment of the present invention.

10 is a flowchart illustrating a method of transmitting an RRC signal by a base station according to an embodiment of the present invention.

11 is a flowchart illustrating a CIF signal transmission method of a base station according to an embodiment of the present invention.

12 is a flowchart illustrating MAC CE transmission and reception between a base station and a terminal according to an embodiment of the present invention.

13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.

Hereinafter, some embodiments will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present specification, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

The present specification describes a communication network, and the work performed in the communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in

A user equipment (UE) may be fixed or mobile and may have other terms such as mobile station (MS), advanced MS (AMS), user terminal (UT), subscriber station (SS), and wireless device (Wireless Device). Can be called.

A base station generally refers to a station communicating with a terminal, and includes an eNodeB (evolved-NodeB), a base transceiver system (BTS), an access point, an femto base station (FemtoeNodeB), and a home eNodeB (HeNodeB). It may be called in other terms such as relay, remote radio head (RRH). The cell should be interpreted in a comprehensive sense indicating some areas covered by the base station, and encompasses various coverage areas such as megacells, macrocells, microcells, picocells and femtocells.

Carrier aggregation (CA) supports a plurality of carriers, also referred to as spectrum aggregation or bandwidth aggregation. Individual unit carriers bound by carrier aggregation are called component carriers (CCs). Each component carrier is defined by a bandwidth and a center frequency. For example, if five component carriers are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.

Hereinafter, the multiple carrier system includes a system supporting carrier aggregation (CA). A serving cell may be defined as an element frequency band that may be aggregated by a CA based on a multiple component carrier system. The serving cell includes a primary serving cell (PCell) and a secondary serving cell (SCell). The primary serving cell is one that provides security input and non-access stratum (NAS) mobility information in a Radio Resource Control (RRC) connection (establishment) or re-establishment state. It means a serving cell. According to the capabilities of the terminal, at least one cell may be configured to form a set of serving cells together with the main serving cell, wherein the at least one cell is called a secondary serving cell. The set of serving cells configured for one terminal may consist of only one main serving cell or one main serving cell and at least one secondary serving cell.

When the terminal configures the CA, the terminal has one RRC connection with the network. When establishing, re-establishing, or handing over an RRC connection, a specific serving cell provides non-access stratum (NAS) mobility information (eg, Tracking Area ID). Hereinafter, the specific serving cell is called a primary serving cell (PCell). The main serving cell may be configured with a DL Downlink Primary Component Carrier (DL PCC) and an UL Uplink Primary Component Carrier (UL PCC).

On the other hand, secondary cells (SCell) may be configured in the form of a serving cell set together with the main serving cell according to the hardware capability (UE capability) of the terminal. The secondary serving cell may be configured of only DL Downlink Secondary Component Carrier (SCC) or may be configured to be paired with UL Uplink Secondary Component Carrier (SCC).

The serving cell set includes one main serving cell and at least one secondary serving cell. The primary serving cell can be changed only through the handover procedure and used for PUCCH transmission. The primary serving cell may not transition to the inactive state, but the secondary serving cell may transition to the inactive state.

Meanwhile, a carrier aggregation carrier (CA) supporting multiple component carriers (CA) may be considered a system supporting five or more component carriers (CCs) in a wideband supporting system. . Many detailed infrastructure technologies must be considered to support these technologies.

FIG. 1 illustrates an example in which carrier aggregation is performed on a plurality of component carriers (CCs) in a LAA (License Assisted Access) situation to which the present invention is applied.

In the present invention, the LAA refers to a wireless communication technique that supports CA operation for one or more SCells operating in an unlicensed band or unlicensed spectrum based on assistance of a PCell operating in a licensed band or spectrum. In other words, LAA is a technology that binds a licensed band and an unlicensed band to one using a CA as an anchor and a licensed band as an anchor. In this case, the licensed band may be used as the primary serving cell and the secondary serving cell, and the unlicensed band may be used only as the secondary serving cell. In addition, the unlicensed band may be activated only through the CA and may not perform LTE communication alone. The UE accesses the network to the licensed band to use the service, and the base station may offload the traffic of the licensed band to the unlicensed band by combining the licensed band and the unlicensed band with a CA according to circumstances.

Referring to FIG. 1, a first terminal UE1 may perform CA on five or more licensed carriers (LCs) and unlicensed carriers, and a second terminal UE2 and a third UE. UE UE3 may perform CA in five licensed bands and unlicensed band carriers. For example, the first terminal may support up to 32 CCs, and may be configured to support 16 CCs among them. The first to third terminals set the licensed band carrier to Pcell or Scell, and then set the remaining unlicensed band carriers to Scell to perform CA. In such a situation, various configurations for downlink / uplink control signaling (DL / UL) control signaling should be considered. For example, excessive signaling overhead may occur to support CAs for up to 32 CCs in the PHY and MAC layers, which can be reduced through RRC signaling proposed below.

The present invention proposes a method of RRC signaling by dividing serving cells into up to four groups in order to more effectively perform addition or modification to Scell in a situation where up to 32 CCs are CA. Each group may be configured with a maximum of eight CCs, the base station may be set to the terminal by determining the number of groups in consideration of the total number of serving cells and the efficiency of radio resource utilization.

Table 1 shows an example of how 25 CCs are divided into four groups.

Table 1

RRC signaling
1st serving cell group (SGC # 0 (supports up to 8 CCs))	Second Serving Cell Group (SGC # 1 (supports up to 8 CCs))	3rd Serving Cell Group (SGC # 2 (supports up to 8 CCs))	4th Serving Cell Group (SGC # 3 (supports up to 8 CCs))
PCell (self-scheduling)	SCell # 0 (Cross-carrier scheduling)	SCell # 0 (Cross-carrier scheduling)	SCell # 0 (self-scheduling)
SCell # 1	SCell # 1	SCell # 1	SCell # 1
SCell # 2	SCell # 2	SCell # 2	SCell # 2
SCell # 3	SCell # 3	SCell # 3	SCell # 3
SCell # 4	SCell # 4	SCell # 4	SCell # 4
SCell # 5	SCell # 5	SCell # 5	SCell # 5
SCell # 6

Referring to Table 1, the number of groups may be determined in consideration of the number of CCs configured in the terminal and the maximum number of CCs that can be set in one group. In the embodiment of Table 1, up to eight CCs may be configured in one serving cell group.

In the embodiment of Table 1, 25 CCs are divided into a total of four groups, the first serving cell group (SCG # 0) includes a total of seven CCs, including the PCell. Each of the six SCells has an index from 1 to 6, and the PCell and all SCells operate with self scheduling. The second serving cell group (SGC # 2) and the third serving cell group (SGC # 3) include six CCs in total, and cross-carrier scheduling is configured in one specific SCell in each group. The remaining serving cells have indices of 1 to 5. The fourth serving cell group (SCG # 3) includes a total of six CCs and operates by self scheduling on all SCells.

In another embodiment, the group of serving cells is divided into two groups, and the first serving cell group (SCG # 0) includes a PCell and may consist of up to 16 serving cells, whereas the second The serving cell group (SCG # 1) always includes the SCell to which the PUCCH SCell is configured (if the terminal supports the PUCCH SCell and the base station is configured with the serving cell group configuration), up to 16 serving cells may be configured. .

Here, PUCCH SCell means that the base station configures PUCCH transmission in addition to the PUCCH transmission (default) of the PCell among the SCell to the terminal supporting it. Through this, uplink control information (UCI) overhead transmitted uplink can be offloaded from PCell to SCell, leading to system performance improvement.

Meanwhile, the relationship between the serving cell index and the serving cell group may be fixed. For example, the index of the total serving cells in the RRC is 0 to 31, and each serving cell may be allocated up to eight serving cells per one serving cell group in four serving cell groups. At this time, the first serving cell group is serving cell index 0-7, the second serving cell group serving cell index 8-15, the third serving cell group serving cell index 16-23, and the fourth serving cell group serving cell index 24-31 It has a serving cell index up to. Of course, such an index is valid only in a radio resource control (RRC) layer, and has a serving cell index in each group, that is, an index of 0 to 7 in the MAC or PHY layer. For example, in MAC or PHY, an index value corresponding to serving cell index 1 (SCell # 1) in serving cell group # 1 in Table 1 may indicate a serving cell index equal to the value of serving cell index 9 in RRC. Can be.

Adding, removing or reconfiguring the secondary serving cell to the serving cell set is performed through an RRC reconfiguration procedure, which is dedicated signaling. When a new secondary serving cell is added to the serving cell set, the RRC reconfiguration message is also transmitted with system information on the new secondary serving cell. Therefore, the secondary serving cell does not need to monitor the change of the system information.

According to an aspect of the present invention, the TAG configuration may be set independently of the above serving cell group configuration. According to the deployment scenario and the frequency band, the serving cells belonging to one TAG and the group belonging to the serving cell group as in the embodiment illustrated in Table 1 may be the same or different. In addition, the number of TAGs used and the number of groups to be used may be set independently and used.

2 illustrates an example of a structure in which serving cells are signaled by grouping according to an embodiment of the present invention.

Referring to FIG. 2, 32 CCs are divided into four serving cell groups, that is, SCG # 0, SCG # 1, SCG # 2, and SCG # 3. In FIG. 2, MAC signaling # 0 and PHY signaling # 0 represent MAC signaling and PHY signaling in SCG # 0, and MAC signaling # 1 and PHY signaling # 1 represent MAC signaling and PHY signaling in SCG # 1. Similarly, MAC signaling # 2 and PHY signaling # 2 represent MAC signaling and PHY signaling in SCG # 2, and MAC signaling # 3 and PHY signaling # 3 represent MAC signaling and PHY signaling in SCG # 3.

The method of serving cell grouping according to an embodiment of the present invention can support CAs using five or more CCs while minimizing the influence on the PHY / MAC control information signaling format of a conventional wireless communication system using five CCs. have. For example, the present invention provides three effects as follows.

1) A 3-bit CIF field size in a DCI format can be maintained.

2) 8-bit activation / deactivation It is possible to maintain the field structure of the MAC CE.

3) The field structure of the 8-bit PHR MAC CE can be maintained.

A CIF (Carrier Indication Field) is a serving cell that appears in a terminal having crosscarrier scheduling configured for a specific SCell through RRC signaling from a base station in a DCI format and schedules (E) PDCCH for downlink / uplink transmission of the SCell. serving cell).

Assuming serving cell grouping is not applied according to an embodiment of the present invention, when performing CA, if the maximum number of concatenated CCs increases from 5 to 32, a carrier indication field (CIF) in the DCI format is It must increase from 3 bits to 5 bits to enable cross-carrier scheduling for all CCs. However, increasing the size of the CIF may not only affect the PHY structure but also adversely affect the PDCCH (or EPDCCH) link performance.

Therefore, if the concept of the serving cell group proposed in the embodiment of the present invention is applied, a 3-bit CIF field can be used because the CIF is set in one serving cell group. Thus, the PHY structure may be less affected by the number of CIF fields and serving cells.

According to an aspect of the present invention, the CIF in the DCI format according to each serving cell group may configure cross-carrier scheduling only in each serving cell group. If the CIF is not set, it may be determined to perform self-scheduling. This precondition can be a good precondition for UCI enhancement. For example, in the conventional system, the number of serving cells is taken into account in the size of HARQ-ACK reporting bits, and the number of HARQ-ACK bits is divided by SCG unit to form a new UCI signaling format or PUCCH on the SCell. Can be transmitted through In addition, the PHY can be effectively designed for CSI, soft-buffer, rate-matching, and power control. In addition, according to the above configuration, the overhead of downlink control signaling may be distributed to a specific serving cell such as a PCell. In addition, setting of a PDCCH / EPDCCH search space may be limited. In addition, the PHICH is transmitted to the serving cell in which the UL grant signal is transmitted.

According to another aspect of the present invention, when one serving cell group includes a PCell or a PUCCH SCell, 8-bit activation / deactivation MAC CE may be applied.

That is, when CA is configured in the terminal, the activation / deactivation mechanism for the secondary serving cell is supported to optimize the battery consumption of the terminal. The activation / deactivation mechanism is based on a combination of a MAC Control Element (CE) and a deactivation timer. The MAC CE expresses whether to enable / disable each secondary serving cell as one bit. '0' indicates inactivation and '1' indicates activation. The MAC CE may independently indicate whether to enable / disable secondary serving cells through a bit corresponding to each secondary serving cell, which may be configured in a bitmap form.

3 shows an example of an activation / deactivation MAC CE structure when a PCell or a PUCCH SCell is included in one serving cell group according to an embodiment of the present invention.

3, the structure of the activation / deactivation MAC CE has a fixed length of 8 bits. In FIG. 3, C ₁ is an indicator indicating activation / deactivation for the SCell having the index value '1' when the SCell having the index value '1' is configured. Similarly, C ₂ is an indicator indicating activation / deactivation of the SCell having the index value '2' when the SCell having the index value '2' is configured. At this time, the terminal may ignore the field for the SCell not configured in the terminal. 'R' is a reserved bit and is always set to '0'. It is assumed that the PCell included in the serving cell group is always activated. Similarly, even when a PUCCH SCell is included in a serving cell group, it is assumed that the PUCCH SCell is always activated.

Accordingly, the MAC CE signaling format having the structure shown in FIG. 3 is also used for the serving cell group in which the PUCCH SCell is configured. If a PUCCH SCell and other SCells are included in one serving cell group, the index value of the PUCCH SCell is defined as '0'. In the case where the PUCCH SCell exists in one SCG according to an example of the present invention, this may correspond to the R field.

In relation to the operation of the UE in the activation / deactivation state, if the secondary serving cell is inactive, the UE does not need to receive a PDCCH or PDSCH corresponding to the secondary serving cell, and through an uplink corresponding to the secondary serving cell. No transmission can be done. In addition, CQI (Channel Quality Indicator) measurement should not be performed. In contrast, if the secondary serving cell is in an activated state, the UE may receive the PDCCH and the PDSCH. However, this is performed only when the corresponding UE is configured to monitor the PDCCH for the secondary serving cell. In addition, it should be possible to perform CQI measurement operation.

According to another aspect of the present invention, if a PCell or a PUCCH SCell is not included in one serving cell group and only the other SCells are included, a modified MAC CE may be used.

4 illustrates an example of an activation / deactivation MAC CE structure when a PCell or a PUCCH SCell is not included in one serving cell group according to another embodiment of the present invention.

Referring to Figure 4, the structure of the MAC CE has a fixed length of 8 bits. In FIG. 4, C ₁ is an indicator indicating activation / deactivation of the SCell having the index value '1' when the SCell having the index value '1' is configured. Similarly, C ₂ is an indicator indicating activation / deactivation of the SCell having the index value '2' when the SCell having the index value '2' is configured. At this time, the terminal may ignore the field for the SCell not configured in the terminal. C ₀ is an indicator indicating activation / deactivation for the SCell having the index value '0' when the SCell having the index value '0' is configured. The MAC CE structure of the format shown in FIG. 4 should be used only when the terminal is configured to support five or more CCs and the serving cell grouping of the present invention is used. When the PCell or the PUCCH SCell is not included in one serving cell group as in the embodiment of FIG. 4, compared to the case in which the PCell or the PUCCH SCell is included in one serving cell group as in the embodiment of FIG. 3, activation / deactivation is performed. There is one more SCell to which is indicated. Therefore, instead of using the 'R' field, it is used as an index field for indicating activation / deactivation of one additional SCell.

FIG. 5 illustrates a PCell or a PUCCH SCell in a first serving cell group SGC # 0 and a second serving cell group SGC # 1, and includes a third serving cell group SGC # 2 and a fourth serving cell group (SGC # 0). SGC # 3) shows an example of grouped activation / deactivation MAC CE structure when PCell or PUCCH SCell is not included.

6 illustrates a PCell or a PUCCH SCell in a first serving cell group SGC # 0, a second serving cell group SGC # 1, a third serving cell group SGC # 2, and a fourth serving cell. Group (SGC # 3) shows an example of grouped activation / deactivation MAC CE structure when PCell or PUCCH SCell is not included.

According to an aspect of the present invention, a modified MAC CE structure in which a 2-bit data field is added to the MAC CE type as shown in FIG. 3 or 4 may be used. This is the same as FIG. 7 shows an example of a MAC CE structure according to another embodiment of the present invention.

Referring to FIG. 7, the MAC CE structure may additionally include a 2-bit data field indicating an ID of a serving cell group. The location of the 2-bit data field may be before C ₇ , which is an indicator indicating activation / deactivation, for example, for the SCell having the index value '7' or after R. In addition, the data field may be indicated as 'SGC id'. Since the maximum number of serving cell groups is four, information may be displayed by 2-bit data.

According to an aspect of the present invention, signaling in the form of an extended PHR MAC control element (PHR MAC CE) for eight serving cells in one serving cell group may be used. 8 illustrates an example of an extended PHR MAC CE according to an embodiment of the present invention. The first extended PHR MAC CE structure of FIG. 8 is a structure when a PCell is included in a serving cell group.

Referring to FIG. 8, the first extended PHR MAC CE includes a plurality of octets. The first octet is a field indicating whether a serving cell corresponding to each of C1 to C7 is activated. The second octet then consists of a P field, a V field, and a field indicating the type 2 surplus power (PH) for the primary serving cell. The third octet then consists of two R fields and a field indicating P _{CMAX, c} 1 associated with the surplus power of type 2 above. The fourth octet then consists of a field indicating the type 1 surplus power (PH) for the P field, the V field and the main serving cell. The fifth octet then consists of two R fields and a field indicating P _{CMAX, c} 2 associated with the surplus power of Type 1 above.

9 illustrates an example of an extended PHR MAC CE according to another embodiment of the present invention. The second extended PHR MAC CE structure of FIG. 9 is a structure when a PCell and a PUCCH SCell are included in a serving cell group.

Referring to FIG. 9, the first octet of the second extended PHR MAC CE is a field indicating whether the serving cell corresponding to each of C1 to C7 is activated. Subsequently, the terminal arranges Type 1 and Type 2 surplus power and P _{CMAX, c} information for the _PCell, and thereafter, the terminal types the secondary serving cell configured with the PUCCH among the serving cells in the serving cell group (SCG). 1 and Type 2 surplus power and P _{CMAX, c} information is placed, followed by surplus power and P for the corresponding secondary serving cell in the order of serving cell index of the active secondary serving cells (SCell1, ..., SCell n). A second extended PHR MAC CE is configured by disposing _CMAX information.

According to an aspect of the present invention, when the PHR is performed, the UE provides a value of a serving cell group ID (SCG ID) to the base station by using the reserved bits of the 'R' field to indicate which SCG corresponds to the PHR. Can be.

10, the base station first resets the RRC connection (S1010). Adding, removing or reconfiguring the secondary serving cell to the serving cell set is performed through an RRC reconfiguration procedure, which is dedicated signaling. When a new secondary serving cell is added to the serving cell set, the RRC reconfiguration message is also transmitted with system information on the new secondary serving cell. The secondary serving cell configuration information may include frequency band and center carrier information to which an unlicensed carrier is assigned. Since this is derived through the EARFCN value, the EARFCN value may be included in the secondary serving cell configuration information to indicate which frequency band and which center carrier the corresponding serving cell corresponds to. Therefore, the secondary serving cell may not need to monitor the change of the system information.

Next, the base station transmits the RRC signaling (signaling) for the CC grouped to the terminal (S1030). Each group may consist of up to eight CCs, and the number of groups may be determined in consideration of the total number of serving cells and the efficiency of radio resource utilization.

The RRC signaling transmitted to the terminal may include an index of a serving cell group and an index of a serving cell in the serving cell group. For example, the index of the total serving cells in the RRC is 0 to 31, and each serving cell may be allocated up to eight serving cells per one serving cell group in four serving cell groups. In this case, the first serving cell group is serving cell indexes 0 to 7, the second serving cell group is serving cell indexes 8 to 15, the third serving cell group is serving cell indexes 16 to 23, and the fourth serving cell group is serving cell indexes 24 to 31. It may have a serving cell index up to. For example, the relationship between serving cell indexes included in the serving cell group may be differently mapped (set). Of course, such an index is valid only in RRC (Radio Resource Control), and MAC or PHY has a serving cell index in each group, that is, an index of 0-7. For example, in MAC or PHY, an index value corresponding to serving cell index 1 (SCell # 1) in serving cell group # 1 in Table 1 may indicate a serving cell index equal to the value of serving cell index 9 in RRC. Can be.

Referring to FIG. 11, the base station configures a 3-bit CIF in the DCI format for (E) PDCCH transmission for the serving cell in which cross-carrier scheduling is configured through RRC signaling (S1110), and transmits to the UE (S1110). S1110).

Serving cells configured with the CIF (ie, SCell) may be configured such that cross-carrier scheduling is performed only within each serving cell group. That is, the serving cell that performs the scheduling and the serving cell that receives the scheduling always belong to the same serving cell group. Here, self-scheduling is performed in the case of a serving cell for which CIF is not set.

Referring to FIG. 12, the base station configures an activation / deactivation MAC CE (S1210) and transmits it to the terminal (S1230). The structure of the enable / disable MAC CE has a fixed length of 8 bits. When the PCell and / or the PUCCH SCell is included in the serving cell group, the structure of the activation / deactivation MAC CE may be configured as shown in FIG. 3. Meanwhile, when the PCell or the PUCCH SCell is included in the serving cell group, the structure of the activation / deactivation MAC CE may be configured as shown in FIG. 4. Meanwhile, as illustrated in FIG. 5 or FIG. 6, an activation / deactivation MAC CE in which four serving cell groups are grouped may be transmitted. Meanwhile, the activation / deactivation MAC CE may further include a 2-bit data field indicating an ID of the serving cell group. 7 shows an example of a MAC CE including a data field indicating an ID of a serving cell group.

Next, the terminal configures an extended PHR MAC control element (PHR MAC CE) (S1250) and transmits it to the base station (S1270). The extended PHR MAC CE may have a structure such as that of FIG. 8 or 9. The extended PHR MAC CE when the PCell is included in the serving cell group has a structure as shown in FIG. 8, and the extended PHR MAC CE when the PCell and the PUCCH SCell are included in the serving cell group has a structure as shown in FIG. 9. . 8 and 9 are structures of an extended PHR MAC CE for all serving cells included in one serving cell group.

13 is a block diagram of a terminal and a base station supporting a serving cell group according to the present invention.

Referring to FIG. 13, a terminal 1300 includes an RF unit 1305, a PHR MAC CE processor 1310, and a memory 1315. The memory 1315 is connected to the PHR MAC CE component 1310 and stores various information for driving the PHR MAC CE component 1310. The RF unit 1305 is connected to the PHR MAC CE component 1310 to transmit and / or receive a radio signal. For example, the RF unit 1305 may receive the RRC signaling, CIF, activation / deactivation MAC CE published herein from the base station 1350.

The PHR MAC CE component 1310 implements the proposed functions, processes, and / or methods. Specifically, the PHR MAC CE component 1310 performs the steps included in FIG. 12, and the extended PHR MAC CE configured through the PHR MAC CE component has a structure as illustrated in FIG. 8 or 9.

In all embodiments of the present disclosure, the operation of the terminal 1300 may be implemented by the PHR MAC CE component 1310.

The memory 1315 stores RRC signaling, CIF, activation / deactivation MAC CE according to the present specification.

The base station 1350 includes a processor 1355, a memory 1360, and an RF unit 965 (radio frequency unit). The memory 1360 is connected to the processor 1355 and stores various information for driving the processor 1355. The RF unit 1365 is connected to the processor 1355 to transmit and / or receive a radio signal. The processor 1355 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 1355. The processor 1355 includes an RRC component 1356, a CIF component 1357, and an activation / deactivation MAC CE component 1358.

RRC component 1356 constitutes an RRC in accordance with the present invention. The RRC signaling configured by the RRC configuration unit 1356 may include an index of a serving cell group and an index of a serving cell in the serving cell group. For example, the index of the total serving cells in the RRC is 0 to 31, and each serving cell may be allocated up to eight serving cells per one serving cell group in four serving cell groups. In this case, the first serving cell group is serving cell indexes 0 to 7, the second serving cell group is serving cell indexes 8 to 15, the third serving cell group is serving cell indexes 16 to 23, and the fourth serving cell group is serving cell indexes 24 to 31. It has a serving cell index up to.

The CIF construction unit 1357 configures and transmits a 3-bit CIF to the terminal. When the CIF is configured, serving cells may be configured such that cross-carrier scheduling is performed only within each serving cell group. If CIF is not set, self-scheduling is set.

The activating MAC CE configuration 1358 configures an activation / deactivation MAC CE having a fixed length of 8 bits. When the PCell or the PUCCH SCell is included in the serving cell group, the structure of the activation / deactivation MAC CE is shown in FIG. 3. Meanwhile, when the PCell or the PUCCH SCell is included in the serving cell group, the structure of the activation / deactivation MAC CE is shown in FIG. 4. Meanwhile, as illustrated in FIG. 5 or FIG. 6, an activation / deactivation MAC CE in which four serving cell groups are grouped may be transmitted. Meanwhile, the activation / deactivation MAC CE may further include a 2-bit data field indicating an ID of the serving cell group. 7 shows an example of a MAC CE including a data field indicating an ID of a serving cell group.

The processor 1355 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device. The RF unit may include a baseband circuit for processing a radio signal. When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. The module may be stored in memory and executed by a processor. The memory may be internal or external to the processor and may be coupled to the processor by various well known means.

According to the present invention, a group and a serving cell in a multi-carrier system, to provide a wireless communication method and apparatus that can reduce the overhead (overhead) in the main serving cell (Pcell). In addition, a plurality of component carriers may be supported while minimizing changes in the existing physical layer structure.

Claims

A method of grouping serving cells of a base station in a multi-component carrier system,

Grouping a plurality of component carriers configured in a terminal; And

Transmitting RRC signaling to the terminal

The method of claim 1, wherein each grouping group includes up to eight component carriers.
The method of claim 1, wherein the RRC signaling includes an index of a serving cell group and an index of a serving cell in the serving cell group.
The method of claim 1, wherein the method of grouping the serving cells further comprises constructing a carrier indicator field (CIF) and transmitting the same to a terminal.
4. The method of claim 3, wherein the CIF has a size of 3 bits.
4. The method of claim 3, wherein the CIF indicates information on component carriers configured for the UE in the serving cell group. 5.
The method of claim 1, wherein the method of grouping the serving cells further comprises transmitting an activation / deactivation medium access control (MAC) control element to the terminal.
In a multi-carrier system, a method of receiving a serving cell grouped by a terminal,

Receiving RRC signaling from a base station

The method of claim 1, wherein each grouped group includes a maximum of eight component carriers.
8. The method of claim 7, wherein the RRC signaling comprises an index of a serving cell group and an index of a serving cell in the serving cell group.
8. The method of claim 7, further comprising receiving a carrier indicator field (CIF) from the base station.
10. The method of claim 9, wherein the CIF has a size of 3 bits.
10. The method of claim 9, wherein the CIF indicates information on component carriers configured for the UE in the serving cell group.
8. The method of claim 7, further comprising receiving an activation / deactivation Medium Access Control (MAC) Control Element from a base station.