JP2014520411A - Providing control information to UE - Google Patents

Abstract

A method is provided for providing control information to a user equipment (UE) (150) communicating with a base station (110) over a wireless communication system (100). According to an ECCE (enhanced-control channel element) structure including a variable number of REGs (resource element groups), at least one E-PDCCH (enhanced-physical downlink control) pair is assigned. Mapping to PBR (physical resource blocks) and changing the number of REGs in the E-CCE structure.
[Selection] Figure 1

Description

  The present invention relates to a method of providing control information to UEs (User Equipments) in data communication, and more particularly, to using enhanced physical downlink control channels (E-PDCCH) to set up UEs.

  In an existing LTE wireless communication system such as LTE (Long Term Evolution) Release 8, 9 and 10, the eNodeB in the LTE system should give which UE (User Equipment) the uplink resource for data transmission and which Determine whether the UE should be scheduled for data reception on the downlink and provide appropriate control information to the UE accordingly. As an example, the eNodeB is necessary and supported by the UE, and determines the control channel resource amount of PDCCH (Physical Downlink Control Channel) that constitutes the control information.

  Currently, there is a need to optimize the use of control channel resources to improve system capabilities.

  One aspect of the present invention provides a method for providing control information to a UE that is in data communication with an eNodeB over an LTE (Long Term Evolution) wireless communication system. The method encodes at least one E-PDCCH (Enhanced-Physical Downlink Control Channel) that configures control information for setting the UE to exchange data with the eNodeB on the LTE wireless communication system, According to an E-CCE (Enhanced-Control Channel Element) structure including a variable number of REGs (Resource Element Groups), the at least one E-PDCCH is mapped to at least one pair of assigned PBRs (Physical Resource Blocks). Changing the number of REGs in the E-CCE structure to optimize channel utilization for the E-PDCCH mapping, Communicating the at least one E-PDCCH mapped to a pair of assigned PBRs to the UE, thereby enabling the UE to be configured to exchange the data on the LTE wireless communication system based on the control information , Including that.

  In one or more embodiments, each E-CCE structure is 3, 4, 5, 6, 9, 10, 11, 12, 14 or 16 REGs in size, or equivalently 12, 14, 20, 24. 36, 40, 44, 48, 56 or 64 REs (Resource Elements).

  In one or more embodiments, the size of the E-CCE structure may be different on a pair of PRBs or groups of PRB pairs in a subframe.

When implemented at the eNodeB, the size of the E-CCE structure may be determined by the following steps (1) to (5) at the eNodeB.
(1) Calculate the number of REs available for mapping E-PDCCH or multiplexed E-PDCCH to a pair of PRBs for E-PDCCH or multiple PRB pairs (2) For each E-CCE structure Due to the size, the number of REs available for mapping of E-PDCCH or multiplexed E-PDCCH calculated in step (1) is divided into several REs by the size of the E-CCE structure, Calculate the RE (3) In step (2), select the size of the E-CCE structure that gives the smallest number of remaining REs (4) The size of the E-CCE structure that gives the smallest number of remaining REs is 1 If there are more,
a. For the size of each E-CCE structure that gives the least number of remaining REs, determine the maximum possible aggregation level from the nominated aggregation levels 1, 2, 4 and 8;
b. For the size of each E-CCE structure, the number of REs available for mapping of E-PDCCH or multiplexed E-PDCCH calculated in step (1) is determined in steps (4) a. Calculate the remaining RE divided into several REs at the maximum possible aggregation level in
c. Select the size of the E-CCE structure that results in the smallest remaining RE. (5) If there is not more than one E-CCE structure size that gives the least number of remaining REs, select in step (3). The size of the E-CCE structure

When implemented in the UE, the size of the E-CCE structure may be determined by the UE according to the following steps (1) to (5).
(1) Calculate the number of REs available for mapping E-PDCCH or multiplexed EPDCCH in a pair of assigned PRBs or multiple PRB pairs. (2) For the size of each E-CCE structure: The remaining REs are calculated by dividing the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH calculated in step (1) into several REs by the size of the E-CCE structure (3) In step (2), select the size of the E-CCE structure that gives the least number of remaining REs (4) If there is more than one E-CCE structure size that gives the least number of remaining REs,
a. For the size of each E-CCE structure that gives the least number of remaining REs, determine the maximum possible aggregation level from the nominated aggregation levels 1, 2, 4 and 8;
b. For the size of each E-CCE structure, the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH calculated in step (1) is determined in steps (4) a. Calculate the remaining RE divided into several REs at the maximum possible aggregation level in
c. Select the size of the E-CCE structure that results in the smallest remaining RE. (5) If there is not more than one E-CCE structure size that gives the least number of remaining REs, select in step (1). The size of the E-CCE structure

  Another aspect of the present invention provides a UE that communicates with an eNodeB over an LTE (Long Term Evolution) wireless communication system. The UE includes a controller. The controller receives at least one E-PDCCH (Enhanced-Physical Downlink Control Channel) that constitutes control information for setting the UE to perform data communication with the eNodeB on the LTE wireless communication system. The at least one E-PDCCH is mapped to at least one pair of allocated PBR (Physical Resource Blocks) according to an E-CCE (Enhanced-Control Channel Element) structure including a variable number of REGs (Resource Element Groups). Is done. In addition, the controller changes the number of REGs in an E-CCE structure to optimize a channel operation rate used for the E-PDCCH mapping, and sets the UE to the LTE wireless communication system based on the control information. In the above, data communication with the eNodeB is set.

  Still another aspect of the present invention provides an eNodeB that communicates with a UE on a LTE (Long Term Evolution) wireless communication system. The eNodeB includes a controller. The controller transmits at least one E-PDCCH (Enhanced-Physical Downlink Control Channel) that constitutes control information for setting the UE to perform data communication with the eNodeB on the LTE wireless communication system. The at least one E-PDCCH is mapped to at least one pair of allocated PBR (Physical Resource Blocks) according to an E-CCE (Enhanced-Control Channel Element) structure including a variable number of REGs (Resource Element Groups). Is done. In addition, the controller changes the number of REGs in an E-CCE structure to optimize a channel operation rate used for the E-PDCCH mapping, and sets the eNodeB to the LTE wireless communication system based on the control information. The UE is set to allow data communication with the UE.

  An aspect of the present invention also provides a method for providing control information to UEs (user equipments) communicating with a base station over a wireless communication system. According to an enhanced-control channel element (ECCE) structure including a variable number of resource element groups (REGs), at least one E-PDCCH (enhanced-physical downlink control) pair is assigned to this method. Mapping to PBR (physical resource blocks) and changing the number of REGs in the E-CCE structure.

  The method encodes the at least one EPDCCH constituting control information for setting the UE to be able to communicate with the base station on the wireless communication system, and maps the encoded information to the at least one pair of assigned PBRs. It may further include transmitting the at least one E-PDCCH to the UE, thereby enabling the UE to be configured to communicate on the wireless communication system based on the control information.

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

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

  In this method, the number of REGs may vary depending on the subframe.

  In this method, the number of REGs may be different even within one subframe.

When implemented in a base station, the size of the E-CCE structure may be determined by the following steps (1) to (5) at the base station.
(1) Calculate the number of REs available for mapping E-PDCCH or multiplexed E-PDCCH to a pair of PRBs for E-PDCCH or multiple PRB pairs (2) For each E-CCE structure Due to the size, the number of REs available for mapping of E-PDCCH or multiplexed E-PDCCH calculated in step (1) is divided into several REs by the size of the E-CCE structure, Calculate the RE (3) In step (2), select the size of the E-CCE structure that gives the smallest number of remaining REs (4) The size of the E-CCE structure that gives the smallest number of remaining REs is 1 If there are more,
a. For the size of each E-CCE structure that gives the least number of remaining REs, determine the maximum possible aggregation level from the nominated aggregation levels 1, 2, 4 and 8;
b. For the size of each E-CCE structure, the number of REs available for mapping of E-PDCCH or multiplexed E-PDCCH calculated in step (1) is determined in steps (4) a. Calculate the remaining RE divided into several REs at the maximum possible aggregation level in
c. Select the size of the E-CCE structure that results in the smallest remaining RE. (5) If there is not more than one E-CCE structure size that gives the least number of remaining REs, select in step (3). The size of the E-CCE structure

When implemented in the UE, the size of the E-CCE structure may be determined by the UE according to the following steps (1) to (5).
(1) Calculate the number of REs available for mapping of E-PDCCH or multiplexed E-PDCCH in a pair of allocated PRBs or multiple PRB pairs (2) Due to the size of each E-CCE structure Next, the remaining REs are calculated by dividing the number of REs available for mapping of E-PDCCH or multiplexed E-PDCCH calculated in step (1) into several REs with the size of the E-CCE structure. (3) In step (2), select the size of the E-CCE structure that gives the least number of remaining REs. (4) There is more than one E-CCE structure size that gives the least number of remaining REs. If you want to
a. For the size of each E-CCE structure that gives the least number of remaining REs, determine the maximum possible aggregation level from the nominated aggregation levels 1, 2, 4 and 8;
b. For the size of each E-CCE structure, the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH calculated in step (1) is determined in steps (4) a. Calculate the remaining RE divided into several REs at the maximum possible aggregation level in
c. Select the size of the E-CCE structure that results in the smallest remaining RE. (5) If there is not more than one E-CCE structure size that gives the least number of remaining REs, select in step (1). The size of the E-CCE structure

  Another aspect of the present invention provides a base station that communicates with a user equipment (UE) over a wireless communication system. The base station has at least one E-PDCCH (enhanced-physical downlink control) pair according to an enhanced-control channel element (E-CCE) structure including a variable number of resource element groups (REGs). A mapping unit that maps to PBR (physical resource blocks) assigned to the E-CCE structure.

  The base station may further include a transmission unit that transmits the at least one EPDCCH constituting the control information. In this case, the UE is configured to communicate with the base station on the wireless communication system based on the control information.

  Still another aspect of the present invention provides a UE (user equipment) that communicates with a base station over a wireless communication system. The UE includes a controller. The controller receives at least one enhanced-physical downlink control channel (EPDCCH) constituting control information for setting the UE to communicate with the base station on the wireless communication system. The at least one E-PDCCH is mapped to at least a pair of allocated PBRs (physical resource blocks) according to an enhanced-control channel element (E-CCE) structure including a variable number of resource element groups (REGs). Is done. The number of REGs in the E-CCE structure is changed by the base station.

  Yet another aspect of the invention provides a method implemented in a base station. According to the ECCE (enhanced-control channel element) structure including a variable number of resource element groups (REGs), at least one EPDCCH (enhanced-physical downlink control) is assigned to the method. Mapping to (physical resource blocks) and changing the number of REGs in the E-CCE structure.

  In this method, the at least one EPDCCH constituting control information for setting a UE to communicate with the base station on a wireless communication system is encoded and mapped to the at least one pair of assigned PBRs. It may further comprise transmitting at least one E-PDCCH to the UE, thereby enabling the UE to be configured to communicate on the wireless communication system based on the control information.

  Yet another aspect of the present invention provides a method implemented in a UE (user equipment). The method includes receiving at least one enhanced-physical downlink control channel (EPDCCH) that constitutes control information for setting the UE to be able to communicate with a base station on a wireless communication system. The at least one E-PDCCH is mapped to at least a pair of allocated PBRs (physical resource blocks) according to an enhanced-control channel element (E-CCE) structure including a variable number of resource element groups (REGs). Is done. The number of REGs in the E-CCE structure is changed by the base station.

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

FIG. 1 is a schematic diagram of an LTE (Long Term Evolution) wireless communication system according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating E-PDCCH encoding according to an embodiment of the present invention. FIG. 3 is a graphical representation of 36 RE-sized E-CCE mapping to assigned PRB pairs. FIG. 4 is a graphical representation of 12 RE-sized E-CCEs that map to assigned PRB pairs. FIG. 5 is a graphical representation of E-CCE aggregation for 12 RE-sized E-CCEs. FIG. 6 is a graphical representation of 20 RE-sized E-CCEs that map to assigned PRB pairs. FIG. 7 is a graphical representation of E-CCE aggregation for 20 RE-sized E-CCEs. FIG. 8 is a graphical representation of different E-PDCCH settings on the same subframe that require different E-CCE sizes. FIG. 9 is a flowchart illustrating the steps involved in calculating the optimal E-CCE size at the eNodeB. FIG. 10 is a flowchart illustrating steps related to calculating an optimal E-CCE size in the UE. FIG. 11 is a graphical representation of a first example of spatial multiplexing of different composite control information with the same modulation scheme. FIG. 12 is a graphical representation of a second example of spatial multiplexing of different composite control information with different modulation schemes.

  Embodiments of the present invention will now be described, by way of example only, with reference to the drawings.

  In the current conventional PDCCH design, the mapping of PDCCH to resource elements is directed to the so-called CCE (Control Channel Elements) structure, which is composed of 9 REGs (each consisting of 4 REs). It is a set of 36 valid resource elements that are grouped in turn into resource-element groups. The number of CCEs required for a PDCCH (ie 1, 2, 4 or 8) depends on the payload size of control information (DCI payload) and the channel coating rate. This is used to realize link adaptation for PDCCH. If the channel condition for the terminal to which the PDCCH is directed is in an unfavorable situation, it is necessary to use a larger number of CCEs than in the advantageous channel condition. The number of CCEs used for PDCCH is also referred to as an aggregation level.

  For a conventional PDCCH, the number of CCEs available for PDCCH depends on the control area, the cell bandwidth, the number of downlink antenna ports, and the amount of resources occupied by PHICH. The size of the control area can be dynamically changed depending on the subframe, and other numbers and amounts are set semi-statically.

  According to the working hypothesis and agreement achieved for E-PDCCH (Enhanced-PDCCH), the number of valid REs available for E-PDCCH is the size of the control region, the number of allocated PRB pairs, the number of PRB pairs Location (ie, central 6 or 7 PRBs, or other PRBs), subframe number (ie, subframe # 0, 5 or special subframe for type 2 subframes, or other subframes) , Depending on the number of CRS settings, UE specific RS settings, CSI-RS settings, and subframe type (ie normal CP or extended CP). The size of the control region may change dynamically depending on the subframe. Other numbers and quantities are set semi-statically, but in the case of periodically appearing CSI-RS, PBCH, PSS, SSS, RE reserved for PRS and / or Type 2 frame structure Depending on the special subframe, it may affect the number of available REs available for E-PDCCH mapping per subframe. This leads to inefficient use of available channel resources when using the same CCE size (ie, 9 REGs) as the conventional PDCCH.

In the simple example shown in FIG. 3, the RE used is not actually located at the end of the subframe, but in the following cases 1 to 8, the interleaving function 380 of the E-PDCCH coding mechanism shown in FIG. Are distributed along the PBR pairs assigned after.
1. Normal CP subframe 2. The size of the control region is 2 OFDM symbols. A pair of PRBs are allocated to E-PDCCH in the central 72 subcarriers. It is not a special subframe when the subframe number is 0, 5, or a type 2 subframe. 5.2 CRS antenna ports 6.2 DMRS antenna ports 7.2 CSI-RS antenna ports 8 . On subframe without CSI-RS

  If the same design as a conventional PDCCH is applied with a CCE size of 9 REGs (or 36 REs) and aggregation level 2, 12 REGs (or 48 REs) are not used and -It can be used for additional mapping of PDCCH RE to increase coding gain, thereby improving E-PDCCH demodulation performance. These unused REs account for 40% of the total channel capacity available for E-PDCCH mapping. In this case, assuming that the current ambiguous information bit size 12, 14, or 16 is used, the maximum aggregation level is 2, and aggregation level 1 is QPSK unless a coding rate higher than 1/3 is used. Not applicable to modulated E-PDCCH. This will limit the link adaptation on the transmitted E-PDCCH so that only one coating rate can be used to enable aggregation level 1.

  Referring to FIG. 4 (note that this figure shows that the REs used are not actually located in a logical order, but are distributed along the PBR pairs assigned after the interleaving function 380 of FIG. Note again that it has been simplified for the purpose of explaining only what is done), instead of using a CCE size of 9 REGs (or 36 REs), 3 REGs (Or 12 RE) CCE sizes are used. Six REGs (ie, 24 REs) are not used. This is 20% of the total channel capacity available for E-PDCCH mapping. Further, assuming that the current ambiguous information bit size 12, 14 or 16 is used as shown at the bottom of FIG. 5, if the E-PDCCH is QPSK modulated, the maximum aggregation level is 8, Aggregation levels are 4 and 8. This provides better link adaptation from the perspective of different aggregation levels. When considering higher-order modulation schemes such as 16-QAM or 64-QAM, a plurality of E-PDCCHs having the same modulation level can be assigned to all available REs with possible aggregation levels {2, 4, 8}. Can be multiplexed and used. This is illustrated in FIG. 5 as 16-QAM and 64-QAM modulated E-PDCCH.

  Referring to FIG. 6 (note that this figure shows that the REs used are not actually located in a logical order, but are distributed along the PBR pairs assigned after the interleaving function 380 of FIG. Note again that it has been simplified for the purpose of illustrating only what is being done), instead of using a CCE size of 9 REGs (ie 36 REs) A CCE size of REG (ie, 20 REs) is used. When aggregation level 4 is used, 6 CCEs can fit into the assigned PRB pair. Ten REGs (ie, 40 REs) are not used. This is 33% of the total channel capacity available for E-PDCCH mapping. When the E-PDCCH is QPSK modulated as shown at the top of FIG. 7, the maximum aggregation level is 4, and there is no other possible aggregation level. When considering higher-order modulation schemes such as 16-QAM or 64-QAM, a plurality of E-PDCCHs having the same modulation level are all available REs with possible aggregation levels {1, 2, 4}. Can be multiplexed and used. This is shown at the bottom of FIG. 7 as 16-QAM and 64-QAM modulated E-PDCCH.

  In the above example, it has been demonstrated that different CCE sizes are required for E-PDCCH in order to efficiently allocate and utilize channel capacity to E-PDCCH and to enable link adaptation efficiently.

  According to one or more embodiments, the present invention provides a set of different E-CCE sizes used for E-PDCCH, and a method for implementing at eNodeB and UE, which is suitable for subframes based on E-CCE size. We propose a method that does not need to use signaling to calculate and select the E-CCE to inform the UE of the configured E-CCE size used in the eNodeB.

  According to one or more embodiments, the set of E-CCE sizes nominated for E-PDCCH is not limited to {3, 4, 5, 6, 9, 10, 11 , 12, 14, 16} REGs or {12, 16, 20, 24, 36, 40, 44, 48, 56, 64} REs.

  FIG. 1 shows an LTE wireless communication system 100 that supports E-PDCCH with variable E-CCE size.

The radio system 100 includes an eNodeB 110 for encoding control information and transmitting E-PDCCH to a desired UE 150 via a radio channel. The eNodeB 100 uses the following a to d.
a. Implemented E-PDCCH encoding function 112 that encodes control information to be transmitted
b. E-CCE size calculation function 111 for deriving an optimal E-CCE size for link adaptation
c. Implemented E-CCE aggregation function 113 and E-PDCCH multiplexing function 114 forming composite control information
d. Implemented E-PDCCH physical channel processing function 115 that performs layer mapping, precoding, and E-PDCCH RE mapping to PRB pairs assigned to transmit E-PDCCH
In addition, the eNodeB maps E-PDCCH with different settings targeted to different UE groups or E-PDCCH groups to maximize channel conditions, link adaptation, beamforming and performance goals as shown in FIG. I can do it.

  FIG. 2 further illustrates detailed E-PDCCH channel coding and physical channel coding (300).

  In addition, the exemplary eNodeB is an E-PDCCH that spatially multiplexes multiple control information streams with the same or different modulation schemes for multi-layer transmission and precoding as shown in FIGS. 11 and 12, respectively. A physical channel processing function 115 is implemented.

  Furthermore, the radio system 100 includes a UE 150. The UE 150 uses the E-PDCCH reception function 153, the E-CCE size calculation function 151, and the E-PDCCH blind decoding function 152 to receive, detect, and decode the E-PDCCH for itself.

  The eNodeB that implements the E-CCE size calculation function will be described in a schematic procedure defined in FIG. 9 in the following steps.

In the radio system, UEs belonging to eNodeB are geometrically distributed. For this reason, different settings for each UE or UE group improve the E-PDCCH demodulation performance. This is also a requirement that different E-CCE sizes be used for each UE or UE group sharing the same PRB pair and / or beamforming configuration assigned for E-PDCCH RE mapping. For UE groups that share the same PRB pair assigned for E-PDCCH RE mapping, have the same DMRS configuration, and have the same beamforming configuration, due to semi-static configuration, the eNodeB The following steps 1-5 are used to calculate all possible control region sizes as well as E-CCE sizes for subframes with or without CSI-RS.
1. 1. Calculate the number of REs available for E-PDCCH mapping 2. For each E-CCE size, calculate the remaining REs by dividing the number of REs available for E-PDCCH mapping calculated in (1) into several REs by E-CCE size. 3. Select E-CCE size that gives the least remaining RE in (2). If there are more than 1 E-CCE sizes giving the same minimum remaining RE,
a. For each E-CCE size that gives the least remaining RE, determine the maximum possible aggregation level, the nominated aggregation level is {1, 2, 4, 8};
b. For each E-CCE size, calculate the remaining REs, dividing the number of REs available for E-PDCCH mapping calculated in (1) into several REs at the maximum possible aggregation level;
c. 4. Select the E-CCE size that results in the smallest remaining RE. Otherwise, use the E-CCE size selected in (3)

  For each subframe, the eNodeB was calculated corresponding to the dynamically configured control region size with or without CSI-RS for E-PDCCH encoding, E-CCE aggregation and E-PDCCH multiplexing. E-CCE size is used. The E-CCE sizes calculated by these eNodeBs will remain valid until the semi-static parameter set is reconfigured and activated, or until the number of assigned PRB pairs is changed and valid. .

  In order to allow the UE to apply the same E-CCE size as calculated and used by the eNodeB without signaling, the UE is described in the following steps and is schematically defined in FIG. Implement the procedure for calculating the size.

In a wireless system such as system 100, the eNodeB can be configured to monitor the UE for different sets of PRB pairs assigned for different E-PDCCH configurations, as shown in FIG. This also requires a different E-CCE size to be used for each E-PDCCH configuration monitored by the UE. For each E-PDCCH configuration that the UE monitors, the UE uses the following steps 1 to 5 for all possible control region sizes, as well as E- for subframes with or without CSI-RS. CCE size is calculated.
1. 1. Calculate the number of REs available for E-PDCCH mapping 2. For each E-CCE size, calculate the remaining REs by dividing the number of REs available for E-PDCCH mapping calculated in (1) into several REs by E-CCE size. 3. Select E-CCE size that gives the least remaining RE in (2). If there are more than 1 E-CCE sizes giving the same minimum remaining RE,
a. For each E-CCE size that gives the least remaining RE, determine the maximum possible aggregation level, the nominated aggregation level is {1, 2, 4, 8};
b. For each E-CCE size, calculate the remaining REs, dividing the number of REs available for E-PDCCH mapping calculated in (1) into several REs at the maximum possible aggregation level;
c. 4. Select the E-CCE size that results in the smallest remaining RE. Otherwise, use the E-CCE size selected in (3)

  For each subframe, the UE dynamically detects with or without CSI-RS for E-PDCCH encoding, E-PDCCH reception and E-PDCCH blind decoding for control information directed to itself. The E-CCE size calculated corresponding to the control area size is used. The E-CCE sizes calculated by these UEs will remain valid until the semi-static parameter set is reconfigured and activated, or until the number of assigned PRB pairs is changed and valid. .

As can be seen from the above, the various described embodiments of the present invention provide a list of non-comprehensive effects such as the following 1-5.
1. By selecting and setting various E-PDCCH E-CCE sizes by the eNodeB, it is possible to effectively use RE (Resource Elements) that can be used to map the E-PDCCH in a pair of PRBs or a plurality of PRB pairs.
2. The eNodeB calculates an optimum E-CCE size without notifying the UE, and performs a procedure for applying the calculated E-CCE size on a subframe basis.
3. There is a procedure for calculating an optimum E-CCE size used by the eNodeB by the UE without signaling and applying an accurate E-CCE size used by the eNodeB for each subframe and for each E-PDCCH setting. To be implemented.
4). E-PDCCHs with different settings are mapped onto the same channel BW to obtain optimal link adaptation and channel conditions, and optimal E-PDCCH channels with different E-CCE sizes for different E-PDCCH settings Maintain assignments.
5. Multiple control information streams are multiplexed with different E-CCE aggregation and modulation schemes.

  Of course, various changes, additions and / or improvements may be made to the above-described portions without departing from the scope of the present invention, and in view of the above teachings, the present invention provides software, The firmware and / or hardware may be implemented in various ways that can be understood by those skilled in the art.

  Discussion of documents, acts, materials, devices, supplies, etc. included in this specification is solely for the purpose of providing the content of the invention. Any or all of these matters form part of the prior art or do not imply or imply that they were well known in the relevant fields of the invention that existed before the priority date of each claim of this application. No.

  Throughout the description and claims, the word “comprise” and variations of the word “comprise” are not intended to exclude other additions, components, integer values, or steps. .

  This application claims priority based on Australian Provisional Patent Application No. 2012901017 filed on Mar. 14, 2012, the entire disclosure of which is incorporated herein.

  The present invention is applicable to a method of providing control information to a UE (User Equipment) that performs data communication with an eNodeB on a LTE (Long Term Evolution) wireless communication system.

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

Claims (14)

A method for providing control information to UEs (user equipments) communicating with a base station on a wireless communication system,
According to an ECCE (enhanced-control channel element) structure including a variable number of REGs (resource element groups), at least one E-PDCCH (enhanced-physical downlink control channel) is assigned to at least one pair of B resource blocks),
Changing the number of REGs in the E-CCE structure;
A method involving that. In claim 1,
Encoding the at least one EPDCCH comprising control information for configuring the UE to communicate with the base station on the wireless communication system;
Conveying the at least one E-PDCCH mapped to the at least one pair of assigned PBRs to the UE, thereby enabling the UE to be configured to communicate on the wireless communication system based on the control information;
A method further comprising: In claim 1 or 2,
Each E-CCE structure has a size of 3, 4, 5, 6, 9, 10, 11, 12, 14, or 16 REGs,
A method characterized by that. In claim 1 or 2,
Each E-CCE structure has a size of 12, 16, 20, 24, 36, 40, 44, 48, 56 or 64 RE (resource elements),
A method characterized by that. In any one of Claims 1-4,
The number of REGs varies according to subframes. In any one of Claims 1-4,
The method according to claim 1, wherein the number of REGs is different even within one subframe. In any one of Claims 1-4,
When the method is performed at a base station,
The size of the E-CCE structure is the base station,
(1) Calculate the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH to a pair of PRBs for E-PDCCH or a plurality of PRB pairs,
(2) For each E-CCE structure size, the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH calculated in step (1) Calculate the remaining RE divided into REs,
(3) Select the size of the E-CCE structure that gives the minimum number of remaining REs in step (2);
(4) If there is more than one E-CCE structure size that gives the least number of remaining REs,
a. For the size of each E-CCE structure that gives the least number of remaining REs, determine the maximum possible aggregation level from the nominated aggregation levels 1, 2, 4 and 8;
b. For the size of each E-CCE structure, the number of REs available for mapping of E-PDCCH PDCCH or multiplexed E-PDCCH calculated in step (1) is determined in steps (4) a. Calculate the remaining RE divided into several REs at the maximum possible aggregation level in
c. Select the size of the E-CCE structure that will be the smallest remaining RE,
(5) If the size of the E-CCE structure that gives the minimum number of remaining REs does not exist more than 1, use the size of the E-CCE structure selected in step (3).
Method, determined by In any one of Claims 1-4,
When the method is performed at the UE,
The size of the E-CCE structure is the UE,
(1) calculating the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH in a pair of allocated PRBs or a plurality of PRB pairs;
(2) For each E-CCE structure size, the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH calculated in step (1) Calculate the remaining RE divided into REs,
(3) Select the size of the E-CCE structure that gives the minimum number of remaining REs in step (2);
(4) If there is more than one E-CCE structure size that gives the least number of remaining REs,
a. For the size of each E-CCE structure that gives the least number of remaining REs, determine the maximum possible aggregation level from the nominated aggregation levels 1, 2, 4 and 8;
b. For the size of each E-CCE structure, the number of REs available for mapping of E-PDCCH or multiplexed EPDCCH calculated in step (1) is determined in steps (4) a. Calculate the remaining RE divided into several REs at the maximum possible aggregation level in
c. Select the size of the E-CCE structure that will be the smallest remaining RE,
(5) If the size of the E-CCE structure that gives the minimum number of remaining REs does not exist more than 1, use the size of the E-CCE structure selected in step (1).
Method, determined by A base station that communicates with a UE (user equipment) on a wireless communication system,
According to an enhanced-control channel element (E-CCE) structure including a variable number of REGs (resource element groups), at least one E-PDCCH (enhanced-physical downlink control channel pair) is assigned. A mapping unit for mapping to (physical resource blocks),
Changing the number of REGs in the E-CCE structure;
base station. In claim 9,
A transmission unit that transmits the at least one EPDCCH constituting control information;
The UE is configured to communicate with the base station on the wireless communication system based on the control information;
Base station characterized by that. A UE (user equipment) communicating with a base station on a wireless communication system,
A controller,
The controller receives at least one enhanced-physical-downlink control channel (EPDCCH) constituting control information for setting the UE to be able to communicate with the base station on the wireless communication system, and the at least one The E-PDCCH is mapped to at least one pair of allocated PBR (physical resource blocks) according to an enhanced-control channel element (E-CCE) structure including a variable number of REGs (resource element groups).
The number of REGs in an E-CCE structure is changed by the base station,
UE. A method implemented in a base station, comprising:
According to an ECCE (enhanced-control channel element) structure including a variable number of REGs (resource element groups), at least one EPDCCH (enhanced-physical downlink control channel) is assigned to a pair of sir, squeezed by a squeeze of a pair of ce To)
Changing the number of REGs in the E-CCE structure;
A method involving that. In claim 12,
Encoding the at least one EPDCCH comprising control information for configuring a UE to be able to communicate with the base station over a wireless communication system;
Conveying the at least one E-PDCCH mapped to the at least one pair of assigned PBRs to the UE, thereby enabling the UE to be configured to communicate on the wireless communication system based on the control information;
A method further comprising: A method implemented in a UE (user equipment),
Receiving at least one enhanced-physical downlink control channel (EPDCCH) that constitutes control information for setting the UE to be able to communicate with a base station on a wireless communication system,
The at least one E-PDCCH is mapped to at least a pair of allocated PBRs (physical resource blocks) according to an enhanced-control channel element (E-CCE) structure including a variable number of resource element groups (REGs). And
The number of REGs in an E-CCE structure is changed by the base station,
Method.

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