KR101932312B1 - A method of providing control information for user equipment - Google Patents

Abstract

A method of providing control information for user equipments (UEs) 150 communicating with a base station 110 via a wireless communication system 100 is provided. The method comprises providing at least one enhanced pair of physical downlinks (PRBs) to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure comprising a variable number of resource element groups Mapping a control channel (E-PDCCH); And changing the number of REGs in the E-CCE structure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for providing control information to a user equipment,

The present invention relates to a method of providing control information for a user equipment (UE) in data communication, and more particularly to the use of an enhanced physical downlink control channel (E-PDCCH) for configuring a UE.

In existing Long Term Evolution (LTE) wireless communication systems, such as LTE Releases 8, 9 and 10, an eNodeB in an LTE system determines which user equipment (UE) in the system is to be given uplink resources for data transmission and which UE To be scheduled for data reception on the downlink, and then provides appropriate control information for the UEs accordingly. In one example, the eNodeB determines the amount of control channel resources of the physical downlink control channel (PDCCH) that are required and supported for the UEs, including this control information.

There is a need to optimize the use of control channel resources to improve system performance.

One aspect of the invention provides a method of providing control information for UEs in data communication with an eNodeB via a Long Term Evolution (LTE) wireless communication system,

This method

Encoding at least one enhanced physical downlink control channel (E-PDCCH) comprising control information for configuring UEs to communicate data with an eNodeB through an LTE wireless communication system;

Mapping at least one E-PDCCH to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure comprising a variable number of resource element groups (REGs) ;

Changing the number of REGs in the E-CCE structure to optimize channel capacity usage for E-PDCCH mapping; And

Transmitting at least one E-PDCCH mapped to at least one assigned pair of PRBs to the UEs such that the UEs can be configured to communicate the data over an LTE wireless communication system based on control information

.

In one or more embodiments, each E-CCE structure has 12, 16, 20, 24, 36, 40, and 44 as REGs or equivalents of 3, 4, 5, 6, 9, 10, , 48, 56 or 64 resource elements (RE).

In one or more embodiments, the E-CCE structure size may vary for a pair of PRBs in a subframe or a group of pairs of PRBs.

When implemented in an eNodeB, the size of the E-CCE structure is

(1) calculating the number of REs available for the mapping of E-PDCCHs or multiplexed E-PDCCHs for an intended PRB pair or multiple PRB pairs for E-PDCCH (s);

(2) For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the E-CCE structure size Calculate the number of remaining REs when divided by;

(3) selecting an E-CCE structure size that provides a minimum number of remaining REs in step (2);

(4) if there is more than one E-CCE structure size providing a minimum number of remaining REs:

a. For each E-CCE structure size providing the minimum number of remaining REs, determine the maximum possible aggregation level from the specified aggregation levels of 1, 2, 4, and 8,

b. For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the number of REs in step (4) a. Calculate the remainder when dividing by the maximum possible aggregation level,

c. Selecting an E-CCE structure size having a minimum residue;

(5) Otherwise, it can be determined in the eNodeB by using the E-CCE structure size selected in step (3).

When implemented in a UE, the size of the E-CCE structure is

(1) calculating the number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in the assigned PRB pair or multiple PRB pairs;

(2) For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the E-CCE structure size Calculate the number of remaining REs when divided by;

(3) selecting an E-CCE structure size that provides a minimum number of remaining REs in step (2);

(4) if there is more than one E-CCE structure size providing a minimum number of remaining REs:

a. For each E-CCE structure size providing the minimum number of remaining REs, determine the maximum possible aggregation level from the specified aggregation levels of 1, 2, 4, and 8,

b. For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the number of REs in step (4) a. Calculate the remainder when dividing by the maximum possible aggregation level,

c. Selecting an E-CCE structure size having a minimum residue;

(5) Otherwise, it may be determined at the UE by using the E-CCE structure size selected in step (1).

Another aspect of the invention provides a UE for data communication with an eNodeB via a Long Term Evolution (LTE) wireless communication system,

The UE

(E-PDCCH) comprising control information for configuring a UE to communicate data with an eNodeB through an LTE wireless communication system, wherein the at least one E-PDCCH comprises a variable number of Is mapped to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure comprising a resource element group (REG);

Changing the number of REGs in the E-CCE structure to optimize channel capacity usage for E-PDCCH mapping;

To configure the UE to communicate data with the eNodeB through the LTE wireless communication system based on the control information

Lt; / RTI >

Yet another aspect of the present invention provides an eNodeB that communicates data with UEs via a Long Term Evolution (LTE) wireless communication system,

This eNodeB

(E-PDCCH) comprising control information for configuring UEs to communicate data with an eNodeB through an LTE wireless communication system, wherein at least one E-PDCCH comprises a variable number of Is mapped to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure comprising a resource element group (REG);

Changing the number of REGs in the E-CCE structure to optimize channel capacity usage for E-PDCCH mapping;

To configure the eNodeB to communicate data with the UEs via the LTE wireless communication system based on control information

Lt; / RTI >

A further aspect of the invention provides a method of providing control information for user equipments (UEs) communicating with a base station via a wireless communication system. The method comprises providing at least one enhanced pair of physical downlinks (PRBs) to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure comprising a variable number of resource element groups Mapping a control channel (E-PDCCH); And changing the number of REGs in the E-CCE structure.

The method includes the steps of encoding at least one E-PDCCH comprising control information for configuring UEs to communicate with a base station via a wireless communication system; And transmitting at least one E-PDCCH mapped to at least one assigned pair of PRBs to the UEs such that the UEs can be configured to communicate over the wireless communication system based on the control information .

In this method, each E-CCE structure may have a size of 3, 4, 5, 6, 9, 10, 11, 12, 14 or 16 REGs.

In this way, each E-CCE structure may have a size of 12, 16, 20, 24, 36, 40, 44, 48, 56 or 64 resource elements (RE).

In this way, the number of REGs may vary from subframe to subframe.

In this way, the number of REGs may vary within a subframe.

When implemented at the base station, the size of the E-CCE structure is

(1) calculating the number of REs available for the mapping of E-PDCCHs or multiplexed E-PDCCHs for an intended PRB pair or multiple PRB pairs for E-PDCCH (s);

(2) For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the E-CCE structure size Calculate the number of remaining REs when divided by;

(3) selecting an E-CCE structure size that provides a minimum number of remaining REs in step (2);

(4) if there is more than one E-CCE structure size providing a minimum number of remaining REs:

a. For each E-CCE structure size providing the minimum number of remaining REs, determine the maximum possible aggregation level from the specified aggregation levels of 1, 2, 4, and 8,

b. For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the number of REs in step (4) a. Calculate the remainder when dividing by the maximum possible aggregation level,

c. Selecting an E-CCE structure size having a minimum residue;

(5) Otherwise, it may be determined at the base station by using the selected E-CCE structure size in step (3).

When implemented in a UE, the size of the E-CCE structure is

(1) calculating the number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in the assigned PRB pair or multiple PRB pairs;

(2) For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the E-CCE structure size Calculate the number of remaining REs when divided by;

(3) selecting an E-CCE structure size that provides a minimum number of remaining REs in step (2);

(4) if there is more than one E-CCE structure size providing a minimum number of remaining REs:

a. For each E-CCE structure size providing the minimum number of remaining REs, determine the maximum possible aggregation level from the specified aggregation levels of 1, 2, 4, and 8,

b. For each E-CCE structure size, the calculated number of REs available for mapping the E-PDCCH or multiplexed E-PDCCHs in step (1) to the number of REs in step (4) a. Calculate the remainder when dividing by the maximum possible aggregation level,

c. Selecting an E-CCE structure size having a minimum residue;

(5) Otherwise, it may be determined at the UE by using the E-CCE structure size selected in step (1).

Another aspect of the present invention provides a base station communicating with a user equipment (UE) via a wireless communication system, the base station having an enhanced control channel element (E-CCE) structure comprising a variable number of resource element groups And a mapping unit for mapping at least one enhanced physical downlink control channel (E-PDCCH) to at least one assigned pair of physical resource blocks (PRBs). The base station changes the number of REGs in the E-CCE structure.

The base station may further comprise a transmission unit for transmitting at least one E-PDCCH including control information. In this case, the UE is configured to communicate with the base station via the wireless communication system based on the control information.

Another aspect of the present invention provides a user equipment (UE) that communicates with a base station via a wireless communication system. The UE comprising a controller configured to receive at least one enhanced physical downlink control channel (E-PDCCH) comprising control information for configuring UEs to communicate with a base station via a wireless communication system, wherein at least one E -PDCCH is mapped to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure including a variable number of resource element groups (REGs). The number of REGs in the E-CCE structure is changed by the base station.

Another aspect of the present invention provides a method implemented in a base station. The method comprises providing at least one enhanced pair of physical downlinks (PRBs) to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure comprising a variable number of resource element groups Mapping a control channel (E-PDCCH); And changing the number of REGs in the E-CCE structure.

The method includes the steps of encoding at least one E-PDCCH comprising control information for configuring UEs to communicate with a base station via a wireless communication system; And transmitting at least one E-PDCCH mapped to at least one assigned pair of PRBs to the UEs such that the UEs can be configured to communicate over the wireless communication system based on the control information .

Yet another aspect of the invention provides a method implemented in a user equipment (UE). The method includes receiving at least one enhanced physical downlink control channel (E-PDCCH) comprising control information for configuring UEs to communicate with a base station via a wireless communication system, wherein at least one E-PDCCH Is mapped to at least one assigned pair of physical resource blocks (PRBs) according to an enhanced control channel element (E-CCE) structure including a variable number of resource element groups (REGs). The number of REGs in the E-CCE structure is changed by the base station.

According to the present invention, it is possible to optimize the use of control channel resources at least to improve the system performance of an LTE wireless communication system.

1 is a schematic diagram of a Long Term Evolution (LTE) wireless communication system in accordance with an embodiment of the present invention.
2 is a flowchart illustrating the encoding of an E-PDCCH according to an embodiment of the present invention.
3 is a graphical representation of a mapping of 36 RE sized E-CCEs to an assigned PRB pair.
Figure 4 is a graphical representation of the mapping of 12 RE sized E-CCEs to an assigned PRB pair.
5 is a graphical representation of the E-CCE aggregation for the E-CCE size of 12 REs.
6 is a graphical representation of a mapping of 20 RE-sized E-CCEs to an assigned PRB pair.
Figure 7 is a graphical representation of the E-CCE aggregation for the E-CCE size of 20 REs.
8 is a graphical representation of different E-PDCCH configurations on the same subframe requiring different E-CCE sizes.
Figure 9 is a flow diagram illustrating the steps associated with implementing an optimized E-CCE size calculation in an eNodeB.
10 is a flow chart illustrating the steps associated with implementing an optimized E-CCE size calculation in a UE.
11 is a graphical representation of a first example of spatial multiplexing of different composite control information using the same modulation schemes.
12 is a graphical representation of a second example of spatial multiplexing of different composite control information using different modulation schemes.

Hereinafter, embodiments of the present invention will be described by way of example only with reference to the accompanying drawings.

In the current legacy PDCCH design, the mapping of PDCCHs to resource elements is a set of 36 useful resource elements grouped into nine resource element groups (REG) ). ≪ / RTI > The number of CCE (s) required for a given PDCCH, i.e. 1, 2, 4 or 8, depends on the payload size and channel coding rate of the control information (DCI payload). This is used to realize link adaptation to the PDCCH. If the channel conditions for the terminal to use the PDCCH are unfavorable, a larger number of CCEs should be used than for the advantageous channel conditions. The number of CCEs used for the PDCCH is also referred to as the aggregation level.

In the case of a legacy PDCCH, the number of CCEs available for PDCCHs depends on the size of the control region, the cell bandwidth, the number of downlink antenna ports, and the amount of resources occupied by the PHICH. The size of the control region may vary dynamically for each subframe, while the other quantities are semi-static.

According to the work assumptions and conventions made for the E-PDCCH, the number of available REs (s) available for E-PDCCH (s) depends on the size of the control region, the number of assigned PRB pair (E.g., 6 or 7 PRBs in the center), subframe number (i.e., special subframe or other subframes for subframe # 0, 5 or Type 2 subframes), number of CRS configurations , The UE-specific RS configuration, the CSI-RS configuration, and the type of subframe (i.e. normal or extended CP). The size of the control region may be changed dynamically for each subframe, while the other quantities are semi-statically configured, but the REs reserved for CSI-RS, PBCH, PSS, SSS, (S) available for subframe-by-frame mapping of the E-PDCCH (s) due to special subframes in the case of the structure. This causes ineffective use of available channel resources when the same CCE size (i.e., 9 REGs) is used with the legacy PDCCH.

In the simplified example shown in FIG. 3, the RE (s) used are not actually located at the end of the subframe but are allocated after the interleaving function 380 of the E-PDCCH coding structure shown in FIG. 2, 0.0 > PRB < / RTI > pair.

1. Normal CP subframe

2. Control area size is two OFDM symbols

3. A pair of PRBs is assigned to the E-PDCCH in the center 72 subcarriers

4. Not a special sub-frame in case of sub-frame number 0 or 5 or type 2 frame structure

5. Two CRS antenna ports

6. Two DMRS antenna ports

7. Two CSI-RS antenna ports

8. Sub-frame without CSI-RS

If the same design as the legacy PDCCH is applied with a CCE size of 9 REGs (or 36 REs) and an aggregation level of 2, then 12 REGs (or 48 REs) are left unused and this is probably the E-PDCCH RE To increase the coding gain, and thus to improve the E-PDCCH demodulation performance. This unused RE (s) occupies 40% of the total channel capacity available for E-PDCCH mapping. In this case, assuming that the current ambiguous size of 12, 14 or 16 information bits is used, the maximum aggregation level is 2, and the aggregation level of 1 is QPSK modulated E -PDCCH. ≪ / RTI > This limits the link adaptation to the E-PDCCH being transmitted, i.e. only one coding rate can be used to enable an aggregation level of one.

Referring again to FIG. 4 and again to note that this figure has been simplified for illustrative purposes only, the RE (s) used are not actually arranged in logical order, but rather the interleaving function 380 of FIG. , The E-CCE size of 3 REBs (or 12 REs) is used instead of using the CCE size of 9 REGs (or 36 REs). If an aggregation level of 8 is used, then 10 CCEs may be inserted into the assigned PRB pair. Six REGs (i.e., 24 REs) remain unused. This is 20% of the total channel capacity available for E-PDCCH mapping. Furthermore, the maximum aggregation level of 8, including possible aggregation levels of 4 and 8 in the case of E-PDCCH (s), is limited by the current ambiguous sizes of 12, 14 or 16 information bits QPSK is modulated with the assumption that QPSK is modulated. This provides better link adaptation with respect to different aggregation levels. Considering higher order modulation schemes such as 16QAM or 64QAM, multiple E-PDCCHs with the same modulation level can be multiplexed and used for all available REs with possible aggregation levels of {2, 4, 8} . This is illustrated in Fig. 5 for 16QAM and 64QAM Modulation E-PDCCH (s).

Referring again to FIG. 6 and again to note that this figure has been simplified for illustrative purposes only, the RE (s) used are not actually arranged in a logical order, but rather the interleaving function 380 of FIG. , The E-CCE size of 5 REBs (i.e., 20 REs) is used instead of using the CCE size of 9 REGs (i.e., 36 REs). If an aggregation level of 4 is used, then six CCEs may be inserted into the assigned PRB pair. Ten REGs (or 40 REs) remain unused. This is 33% of the total channel capacity available for E-PDCCH mapping. Moreover, in the case of E-PDCCH (s), the maximum aggregation level of 4, which does not include any other possible aggregation level, is QPSK modulated as shown in the upper part of Fig. Considering higher order modulation schemes such as 16QAM or 64QAM, multiple E-PDCCHs with the same modulation level can be multiplexed and used for all available REs with possible aggregation levels of {1, 2, 4} . This is illustrated in FIG. 7 for 16QAM and 64QAM Modulation E-PDCCH (s).

The above examples have shown that a different CCE size design for the E-PDCCH is needed to effectively utilize the channel capacity allocated to the E-PDCCH, as well as to enable effective realization of link adaptation.

According to one or more embodiments, the present invention not only proposes a different set of E-CCE sizes to be used for the E-PDCCH, but also uses signaling to inform the UE of the configured E-CCE size used in its eNodeB, We propose a method for computing and selecting appropriate E-CCE sizes based on subframes for implementation in eNodeBs and UEs.

According to one or more embodiments, the set of E-CCE sizes designated for the E-PDCCH is {3, 4, 5, 6, 9, 10, 11, 12, 14, 16} REGs, {12, 16, 20, 24, 36, 40, 44, 48, 56, 64} REs.

An LTE wireless communication system 100 supporting an E-PDCCH with a variable E-CCE size is shown in FIG.

The wireless system 100 includes an eNodeB 110 for encoding information using the following functions and for transmitting the E-PDCCH (s) over the wireless channel to the intended UE 150:

a. An E-PDCCH encoding function 112 implemented to encode control information to be transmitted,

b. An E-CCE size calculation function 111 for deriving an optimal E-CCE size for link adaptation,

c. An E-CCE (s) aggregation function 113 and an E-PDCCHs multiplexing function 114 implemented to form complex control information, and

d. E-PDCCH (s) physical channel processing function (115) implemented to perform E-PDCCH (s) RE mapping for assigned PRB pairs to transmit physical layer mapping, precoding and E-PDCCHs. Furthermore, the eNodeB may be configured to receive E-PDCCHs (e. G., As shown in FIG. 8) having different configurations targeting different groups of UEs or groups of E-PDCCHs to maximize performance targets as well as channel conditions, link adaptation and beamforming Can be mapped.

Detailed E-PDCCH channel coding and physical channel coding 300 are further illustrated in FIG.

In addition, the exemplary eNodeB implementation E-PDCCH (s) physical channel processing function 115 may be implemented in a multi-layer transport and pre-coding scheme, as shown in Figures 11 and 12, It has multiplexing.

The wireless system 100 uses its intended E-PDCCH (s) using the E-PDCCH (s) reception function 153, the E-CCE size calculation function 151 and the E-PDCCH And a UE 150 for performing reception, detection, and decoding of the signals.

eNodeB Implementation The E-CCE size calculation function is further described in the following steps using the summarized procedure described above in Fig.

In a wireless system, the UE (s) belonging to the eNodeB are geometrically distributed, and thus different configurations for the UE or group of UE (s) can improve the E-PDCCH (s) demodulation performance. This also means that different E-CCE sizes are used for each UE or group of UE (s) sharing the same assigned PRB pairs for the E-PDCCH (s) RE (s) mapping and / in need. For each group of UEs sharing the same assigned PRB pairs for the E-PDCCHs RE mapping and having the same DMRS configuration and having the same beamforming configuration, the eNodeB, along with each semi-static configuration, Steps are used to calculate the E-CCE size for all possible sizes of the control area and for subframes with or without CSI-RS.

1. Calculate the number of REs (s) available for E-PDCCH (s) mapping.

2. For each E-CCE size, calculate the calculated number of RE (s) available for mapping of E-PDCCH (s) in step (1) to the E-CCE size , The remaining RE (s) are calculated.

3. In step (2), select the E-CCE size (s) that provides the minimum residue.

4. If there are two or more E-CCE sizes that provide the same minimum residue,

a. For each E-CCE size that provides the same minimum residue, determine the maximum possible aggregation level - the specified aggregation level is {1, 2, 4, 8}

b. For each E-CCE size, the calculated number of RE (s) available for mapping of the E-PDCCH (s) in step (1) to the number of RE (s) Calculate the remainder when dividing by the maximum possible aggregation level,

c. Select the E-CCE structure size with the least residue.

5. Otherwise, use the E-CCE size selected in step (3).

For all subframes, the eNodeB computes a computed E-CCE corresponding to the dynamically configured control region size with or without CSI-RS for E-PDCCH encoding, aggregation of E-CCEs and E-PDCCH Use size. This eNodeB computed E-CCE size (s) will remain valid until the set of semi-static parameters to be reconstructed and activated or the number of assigned PRB pairs is changed and validated.

To enable the UE (s) to calculate and apply the same E-CCE sizes used by the eNodeB without signaling, the UE (s) can be described in the following steps using the summarized procedure described above in Fig. Gt; E-CCE < / RTI >

In a wireless system, such as system 100, the eNodeB configures the UE to monitor a different set of assigned PRB pairs for different E-PDCCH (s) configurations as shown in FIG. This also requires that different E-CCE sizes be used for each E-PDCCH configuration that the UE is configured to monitor. For each E-PDCCH configuration that the UE is configured to monitor, the UE calculates all possible sizes of the control region and E-CCE sizes for subframes with and without CSI-RS using the following steps .

1. Calculate the number of REs (s) available for E-PDCCH (s) mapping.

2. For each E-CCE size, calculate the calculated number of RE (s) available for mapping of E-PDCCH (s) in step (1) to the E-CCE size , The remaining RE (s) are calculated.

3. In step (2), select the E-CCE size (s) that provides the minimum residue.

4. If there are two or more E-CCE sizes that provide the same minimum residue,

a. For each E-CCE size that provides the same minimum residue, determine the maximum possible aggregation level - the specified aggregation level is {1, 2, 4, 8}

b. For each E-CCE size, the calculated number of RE (s) available for mapping of the E-PDCCH (s) in step (1) to the number of RE (s) Calculate the remainder when dividing by the maximum possible aggregation level,

c. Select the E-CCE structure size with the least residue.

5. Otherwise, use the E-CCE size selected in step (3).

For all subframes, the UE shall receive the E-PDCCH (s) for its intended control information and, for E-PDCCH (s) blind decoding, The calculated E-CCE size is used. The calculated E-CCE size (s) of this UE will remain valid until the set of semi-static parameters to be reconstructed and activated or the number of assigned PRB pairs is changed and validated.

From the above, the various embodiments of the invention described provide a list of the following non-inclusive advantages.

(E. G., The REs) available for mapping E-PDCCH (s) in a pair of PRBs and multiple pairs of PRBs. -PDCCH E-CCE sizes can be selected and configured.

2. A procedure for calculating optimized E-CCE sizes and applying the calculated E-CCE based on the subframe without notification to the UE is implemented by the eNodeB.

3. The procedure for calculating the optimized E-CCE sizes used by the eNodeB and applying the correct E-CCEs used by the eNodeBs by the eNodeBs by subframe and by E-PDCCH configuration without signaling is implemented by the UE.

4. Mapping the E-PDCCH (s) to different configurations on the same channel (BW), obtaining optimal link adaptation and channel conditions, and using different E-CCE sizes for different E- PDCCH channel allocation.

5. Multiple control information streams are multiplexed using different E-CCE aggregation and modulation schemes.

Additions and / or modifications may be made to the elements described above without departing from the scope of the present invention, and in light of the above teachings, the present invention may be implemented in various ways, / RTI > and / or < / RTI > hardware.

The descriptions of documents, operations, materials, devices, objects, and the like are included herein only for the purpose of providing a context for the present invention. It is to be understood that any or all such occurrences are prior to the priority of each claim of the present application and do not form part of the prior art description or suggest or suggest a general knowledge in the field related to the present invention.

Throughout the description and claims of this specification, the word " comprises " and " comprising " are not intended to exclude other additions, components, integers or steps.

This application is based on and claims priority from Australian Patent Provisional Application No. 2012901017, filed March 14, 2012, the disclosure of which is incorporated herein by reference in its entirety.

The present invention may be applied to a method for providing control information for a user equipment (UE) in data communication with an eNodeB via a Long Term Evolution (LTE) wireless communication system.

100: LTE wireless communication system
110: eNodeB
111: E-CCE size calculation function
112: E-PDCCH encoding function
113: E-CCE (s) aggregation function
114: E-PDCCHs multiplexing function
115: E-PDCCH physical channel processing function
150: User Equipment (UE)
151: E-CCE size calculation function
152: E-PDCCH (s) blind decoding function
153: Reception function of E-PDCCH (s)

Claims (15)

A method implemented in a base station for use in a wireless communication system,
An enhanced physical downlink control channel (E-PDCCH) on at least one physical resource block (PRB) pair using aggregation of one or more enhanced control channel elements (E-CCEs) an enhanced physical downlink control channel to the user equipment, wherein each of the one or more enhanced control channel elements comprises resource element groups (REGs); And
Changing the number of REGs for each E-CCE
Lt; / RTI >
The E-PDCCH includes control information,
Wherein the base station does not signal the size of the E-CCE changed between the base station and the user equipment, including a variable number of the REGs. A method embodied in a user equipment used in a wireless communication system,
Receiving an enhanced physical downlink control channel (E-PDCCH) on at least one physical resource block (PRB) pair from a base station using an aggregation of one or more enhanced control channel elements (E-CCEs) Wherein each of the control channel elements comprises resource element groups (REGs)
The number of REGs changes for each E-CCE, the E-PDCCH includes control information,
Wherein the number of REGs in the E-CCE structure is changed by the base station and the size of the E-CCE changed between the base station and the user equipment, including the variable number of REGs, is not signaled by the base station. 3. The method according to claim 1 or 2,
Wherein each E-CCE structure has one of the sizes of 3, 4, 5, 6, 9, 10, 11, 12, 14 or 16 REGs. 3. The method according to claim 1 or 2,
Wherein the number of REGs varies from subframe to subframe. 3. The method according to claim 1 or 2,
Wherein the number of REGs varies within a subframe. 1. A base station used in a wireless communication system,
A transmitter for transmitting an enhanced physical downlink control channel (E-PDCCH) on at least one physical resource block (PRB) pair to the user equipment using aggregation of one or more enhanced control channel elements (E-CCEs) Wherein each of the enhanced control channel elements comprises resource element groups (REGs), and
A processor for changing the number of REGs for each E-CCE
Lt; / RTI >
The E-PDCCH includes control information,
The base station does not signal the size of the E-CCE changed between the base station and the user equipment, including a variable number of REGs. The method according to claim 6,
Wherein each E-CCE structure has one of the sizes of 3, 4, 5, 6, 9, 10, 11, 12, 14 or 16 REGs. 8. The method according to claim 6 or 7,
Wherein the number of REGs varies from one subframe to another. 8. The method according to claim 6 or 7,
Wherein the number of REGs varies within a subframe. A user equipment for use in a wireless communication system,
A receiver for receiving an enhanced physical downlink control channel (E-PDCCH) on at least one physical resource block (PRB) pair from the base station using an aggregation of one or more enhanced control channel elements (E-CCEs) Wherein each of the enhanced control channel elements comprises resource element groups (REGs)
The number of REGs changes for each E-CCE, the E-PDCCH includes control information,
The size of the E-CCE changed between the base station and the user equipment, wherein the number of REGs in the E-CCE structure is changed by the base station and the variable number of REGs is not signaled by the base station, . 11. The method of claim 10,
Each E-CCE structure has one of the sizes of 3, 4, 5, 6, 9, 10, 11, 12, 14 or 16 REGs. The method according to claim 10 or 11,
Wherein the number of REGs varies from subframe to subframe. The method according to claim 10 or 11,
Wherein the number of REGs varies within a subframe. A method for use in a wireless communication system,
Transmitting an enhanced physical downlink control channel (E-PDCCH) on at least one physical resource block (PRB) pair from a base station to a user equipment using aggregation of one or more enhanced control channel elements (E-CCEs) Each of the one or more enhanced control channel elements comprising resource element groups (REGs); And
Changing the number of REGs for each E-CCE
Lt; / RTI >
The E-PDCCH includes control information,
Wherein the base station does not signal the size of the E-CCE changed between the base station and the user equipment, including a variable number of the REGs. User equipment; And
A base station for transmitting an enhanced physical downlink control channel (E-PDCCH) on at least one physical resource block (PRB) pair to the user equipment using an aggregation of one or more enhanced control channel elements (E-CCEs) Wherein each of the one or more enhanced control channel elements comprises resource element groups (REGs)
/ RTI >
The base station changes the number of REGs for each E-CCE, the E-PDCCH includes control information,
Wherein the number of REGs in the E-CCE structure is varied by the base station and the size of the E-CCE changed between the base station and the user equipment comprising a variable number of REGs is not signaled by the base station, system.

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