JP2016220220A - Improved physical uplink control channel format resource allocation for time division duplex mode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide efficient PUCCH format 1a/1b resource allocation for LTE progress type TDD from a viewpoint of resource consumption.SOLUTION: A method includes: a step for allocating a physical uplink control channel resource by reserving the physical uplink control channel resource with granularity of one ACK/NACK bundle, during time division duplex mode with a user device; and a step for transmitting an instruction of the allocated physical uplink control channel resource from a network access node to the user device.SELECTED DRAWING: Figure 11A

Description

  The present invention relates generally to wireless communication systems, methods, apparatuses and computer programs, and more particularly to resource allocation related signaling between network access nodes and user equipment, and uplink confirmation reporting techniques. However, the present invention is not limited to this.

  This section is intended to provide a background or context to the invention that is defined in the claims. The description herein can include concepts that can be accomplished but not necessarily devised, embodied or described previously. Therefore, unless stated otherwise, what is stated in this section is not prior art to the specification and claims of this application and is not admitted to be prior art by inclusion in this section.

The following abbreviations found in the specification and / or drawings are defined as follows:
3GPP: Third Generation Partnership Project ACK: Confirmation BS: Base Station BW: Bandwidth CA: Carrier Aggregation CC: Component Carrier CCE: Control Channel Element DAI: Downlink Designated Index DL: Downlink (eNB towards UE)
eNB: E-UTRAN NodeB (Evolved NodeB)
EPC: Evolved packet core E-UTRAN: Evolved UTRAN (LTE)
FDMA: frequency division multiple access HSPA: high-speed packet access IMTA: international mobile telecommunications association ITU-R: international telecommunications union-wireless communication sector LTE: long-term evolution of UTRAN (E-UTRAN) MAC: media access control (layer 2, L2)
MM / MME: mobility management / mobility management entity NACK: negative (denial) confirmation NodeB: base station OFDMA: orthogonal frequency division multiple access O & M: operation and maintenance PDCCH: physical download control channel PDCP: packet data convergence protocol PHY: physical (Layer 1, L1)
PUCCH: Physical uplink control channel PUSCH: Physical uplink shared channel QPSK: Quadrature phase shift keying Rel: Release RLC: Radio link control RRC: Radio resource control RRM: Radio resource management mantle SGW: Serving gateway SC-FDMA: Single Single carrier frequency division multiple access TDD: Time division duplex UE: User equipment such as mobile station, mobile node or mobile terminal UL: Uplink (UE towards eNB)
UPE: User plane entity UTRAN: Universal Terrestrial Radio Access Network

  One modern communication system is known as Evolved UTRAN (E-UTRAN, also referred to as UTRAN-LTE or E-UTRA). In this system, the DL access technology is OFDMA and the UL access technology is SC-FDMA.

  One such specification is 3GPP TS 36.00, V8.11.0 (2009-12), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolution Universal Terrestrial Access Network (EUTRAN); Full Description; Stage 2 (Release 8) ", which is incorporated herein by reference in its entirety. This system is referred to as LTE Rel-8 for convenience. In general, 3GPP TS 36. The set of specifications given as xyz (eg, 36.211, 36.311, 36.312, etc.) is considered to describe a Release 8 LTE system. Recently, at least some release 9 versions of these specifications have been published, including 3GPP TS 36.300, V9.3.0 (2010-03).

  FIG. 1A reproduces FIG. 4.1 of 3GPP TS 36.300, V8.11.0 and shows the overall architecture of the EUTRAN system (Rel-8). See also FIG. 1B. The E-UTRAN system comprises an eNB that provides E-UTRAN user plane (PDCP / RLC / MAC / PHY) and control plane (RRC) protocol termination towards the UE. The eNBs are interconnected with each other by an X2 interface. The eNB is also connected to the EPC via the S1 interface, and more specifically to the MME via the S1 MME interface and to the S-GW via the S1 interface (MME / S-GW4). The S1 interface supports a many-to-many relationship between MME / S-GW / UPE and eNB.

The eNB is a host for the following functions.
RRM functions: RRC, radio admission control, connection mobility control, dynamic allocation (scheduling) of resources to UEs in both UL and DL;
IP header compression and encryption of user data streams;
Selection of the MME in the UE attachment;
Routing of user plane data towards EPC (MME / S-GW);
Scheduling and sending of paging messages (generated from MME);
Scheduling and transmission of broadcast information (generated from MME or O &M);
Measurement and measurement report configuration for mobility and scheduling.

  Of particular interest here is a further release of 3GPP LTE (eg LTE Rel-10) targeting future IMTA systems, where, for convenience, simply LTE-Advance (LTE-A) and Called. In this regard, 3GPP TR 36.913, V9.0.0 (2009-12), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Requirements for further advancement of E-UTRA (LTE Advanced) ) (Release 9). 3GPP TR 36.912, V9.3.0 (2010-06) Technical Report 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Feasibility Study for Further Advancement of E-UTRA (LTE Progressive Type) See also (Release 9).

  The goal of LTE-A is to provide significantly improved services at a lower cost with higher data rates and lower latencies. LTE-A is directed to extending and optimizing 3GPP LTE Rel-8 radio access technology to provide higher data rates at lower costs. LTE-A is a more optimal wireless system that satisfies IMT advanced ITU-R requirements while maintaining backward compatibility with LTE Rel-8.

  As specified in 3GPP TR 36.913, LTE-A uses LTE Rel-8 to achieve peak data rates of 100 Mbit / s for high mobility and 1 Gbit / s for low mobility. It must operate with different sized spectrum allocations, including wider spectrum allocations (eg up to 100 MHz). It has been agreed that LTE-A must consider carrier aggregation in order to support bandwidths greater than 20 MHz. Carrier aggregation that aggregates two or more component carriers (CC) is considered for LTE-A to support transmission bandwidths greater than 20 MHz. Carrier aggregation may be continuous or discontinuous. This technology can provide significant gains in terms of peak data rate and cell throughput as a bandwidth extension compared to non-aggregated operations such as LTE Rel-8.

  A terminal can receive one or more component carriers simultaneously based on its capabilities. An LTE-A terminal having a reception capability exceeding 20 MHz can simultaneously receive transmissions on a plurality of component carriers. The LTE Rel-8 terminal can only receive transmissions on a single component carrier if the component carrier structure conforms to Rel-8. Furthermore, LTE-A is Rel-8 LTE in the sense that Rel-8 LTE terminals must operate in LTE-A systems and LTE-A terminals must operate in Rel-8 LTE systems. It is required to be backward compatible.

  FIG. 1C illustrates an example of carrier aggregation by combining M Rel-8 component carriers together to form M HRel-8 BWs (eg, 5H 20 MHz = 100 MHz if M = 5). Yes. The Rel-8 terminal receives / transmits on one component carrier, while the LTE-A terminal receives / transmits simultaneously on multiple component carriers to obtain a higher (wider) bandwidth. it can. In both FDD and TDD systems, it is agreed that up to 5 CCs can be aggregated in LTE advanced.

  FIG. 1D illustrates the use of aggregate component carriers with respect to system bandwidth. In FIG. 1D, the total system bandwidth is shown as 100 MHz (frequency). In case 1, which is the first case for LTE-A where component carriers are aggregated, this entire bandwidth is aggregated and used by a single UE device. In Case 2, the bandwidth is partially aggregated into two 40 MHz groups, leaving the 20 MHz group. This remaining bandwidth is used, for example, by Rel-8 LTE UEs that only require 20 MHz. Note that the CA configuration is UE specific, which means that a Rel-8 UE can operate on each of the five carriers shown. In case 3, no CC is aggregated, so five 20 MHz components can be used by five different UEs.

  3GPP TS 36.211 V9.1.0 (2010-03) Technical Specification Third Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channel and Modulation (Release) 9) describes PUCCH formats 1, 1a and 1b in Chapter 5.4.1.

  In LTE Rel-8 TDD, the UE has the ability to report ACK / NACK feedback related to multiple DL subframes in one UL subframe. Thus, ACK / NACK resources corresponding to multiple DL subframes are implicitly based on the corresponding UL subframe (ie, based on the mapping between the ACK / NACK resource and the corresponding first CCE of the PDCCH). Reserved). A clear PUCCH resource assignment applies for persistently scheduled PDSCH.

  In LTE advanced systems, it has been agreed to support mapping of ACK / NACK resources to one UE-specific UL CC in 3GPP RANI # 58bis. In an LTE advanced TDD system, this means that multiple ACK / NACK resources (corresponding to multiple DL subframes in the time domain and multiple (DL) CCs in the frequency domain) are combined into one UL subframe. It means that it needs to be allocated in one UE specific (UL) CC.

  This solution is expected to increase the PUCCH resource allocation / consumption in the UE specific UL CC. In view of resource consumption, it is desired to provide efficient PUCCH format 1a / 1b resource allocation for LTE advanced TDD.

  By using the exemplary embodiments of the present invention, these and other problems are overcome and other benefits are realized.

  An exemplary embodiment of the present invention, in its first aspect, is a physical uplink control channel with granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle when in time division duplex operation mode with a user equipment. A method is provided that includes allocating physical uplink control channel resources by reserving resources; and transmitting an indication of the allocated physical uplink control channel resources from a network access node to a user equipment.

  An exemplary embodiment of the present invention, in yet another aspect thereof, comprises a processor and a memory including computer program code, the memory and the computer program code together with the processor when the device is at least a user device. Allocating physical uplink control channel resources by reserving physical uplink control channel resources at the granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle when in split duplex mode of operation; and the allocated physical An apparatus configured to cause an indication of a general uplink control channel resource to be transmitted from a network access node to a user equipment is provided.

  An exemplary embodiment of the present invention, in yet another aspect thereof, obtains a single physical uplink control channel format 1a / 1b resource allocation at a user equipment, wherein the physical uplink control channel resource is one Acknowledged / Negated Acknowledgment (ACK / NACK) bundle granularity reserved; performs ACK / NACK bundling across spatial codewords and generates 1 bundled bit per received component carrier / subframe; Then, based on the value of the bundled ACK / NACK bit and the value of the downlink designation index of the physical downlink control channel received last in the ACK / NACK bundle, the control for transmission on the uplink is performed. The method comprising selecting a tape configuration point.

  In yet another aspect thereof, the exemplary embodiment of the present invention obtains allocation of a plurality of physical uplink control channel format 1a / 1b resources at a user equipment, the physical uplink control channel resource being one confirmation. Multiple physical uplinks based on the value of the downlink designation index of the last received physical downlink control channel in the ACK / NACK bundle; A method is provided that includes selecting one of the control channel format 1a / 1b resources and transmitting a bundled ACK / NACK result.

Figure 4.1 of 3GPP TS 36.300 is reproduced and shows the overall architecture of the EUTRAN system. FIG. 3 is another diagram of an EUTRAN system. An example of the carrier aggregation proposed with respect to a LTE-A system is shown. The use of aggregate component carriers is shown in terms of system bandwidth. FIG. 6 is a simplified block diagram of various electronic devices suitable for use in implementing an exemplary embodiment of the present invention. Indicates ACK / NACK complete bundling. The time domain of ACK / NACK and CC domain bundling are shown. 4 shows a first embodiment of PUCCH format 1a / 1b resource allocation for ACK / NACK complete bundling. 5B is a table showing constellation point selection for the embodiment of FIG. 5A. The 2nd Embodiment of PUCCH format 1a / 1b resource allocation of ACK / NACK complete bundling is shown. Fig. 2 illustrates conventional CC and TDD subframe groupings. Fig. 4 illustrates an exemplary embodiment of DAI value encoding. Fig. 4 illustrates another exemplary embodiment of DAI value encoding. The pattern used for ACK / NACK signaling is shown. One of the ACK / NACK signaling patterns of FIG. 9 is shown in detail. FIG. 12 is a logic flow diagram that is a portion of FIG. 11 illustrating the operation of the method according to an exemplary embodiment of the present invention and illustrating the results of execution of a computer program instruction implemented on a computer readable medium. FIG. 12 is a logic flow diagram that is a portion of FIG. 11 illustrating the operation of the method according to an exemplary embodiment of the present invention and illustrating the results of execution of a computer program instruction implemented on a computer readable medium. FIG. 12 is a logic flow diagram that is a portion of FIG. 11 illustrating the operation of the method according to an exemplary embodiment of the present invention and illustrating the results of execution of a computer program instruction implemented on a computer readable medium.

  The exemplary embodiments of the present invention are at least partially related to LTE advanced wireless communication systems expected to be implemented in 3GPP LTE Rel-10 (although the exemplary embodiments are LTE Rel). Not limited to only −10). More particularly, the exemplary embodiment is directed to PUCCH format 1a / 1b (ie, ACK / NACK resource) allocation in the case of component carrier (CC) aggregation in TDD mode.

  In general, TDD operation refers to the use of a single carrier that is time-multiplexed between eNB-to-UE transmission and UE-to-eNB transmission.

  The exemplary embodiment focuses on PUCCH format 1a / 1b resource allocation and provides an efficient allocation technique that can be applied to (but is not limited to) LTE advanced TDD systems.

  As described above, in LTE Rel-8, the PUCCH resource for ACK / NACK feedback corresponding to the dynamically scheduled PDSCH is implicitly determined by the first CCE of the corresponding PDCCH. In LTE advancement, this form of implicit ACK / NACK resource reservation scheme must be preserved at least for the case of backward compatible DL CCs paired with UL CCs. However, as in the case of paired DL CCs, reserving dynamic ACK / NACK resources for all cross CCs results in inefficient use of PUCCH resources. This basically requires reserving dynamic ACK / NACK resources corresponding to all DL CCs in each of the UL CCs.

  Furthermore, in LTE advanced TDD systems, multiple ACK / NACK resources (multiple DL subframes in time domain and multiple DL in frequency domain) in one UE-specific (UL) CC in a single UL subframe. Assigned to the CC). It is readily observed that such “completely implicit resource allocation” performed in Rel-8 results in unacceptable resource consumption for UE-specific CCs.

  In LTE advanced TDD systems, it is pointed out that ACK / NACK bundling remains an important factor, like Rel-8 TDD, to ensure UL coverage. This is especially the case for ACK / NACK in PUCCH format 1a / 1b.

3GPP TSG RAN WG1 Meeting # 60bis, R1-1101886, Beijing, China, April 12-16, 2010, Agenda Item: 6.2.4.1, Source: Nokia, Nokia Siemens Network, Title “UL ACK / As described in “NACK Feedback in LTE-A TDD”, the following options are promising for ACK / NACK feedback in PUCCH format 1a / 1b of LTE advanced TDD.
ACK / NACK complete bundling shown in FIG. 3;
ACK / NACK partial bundling shown in FIG. 4: CC domain bundling + channel selection; and ACK / NACK partial bundling also shown in FIG. 4: time domain bundling + channel selection.

  The proposal made in R1-1101886 is described in detail below, but it can be said that the CA introduces an additional degree of freedom (as compared to Rel-8 TDD) for PDCCH transmitted in DL. As a result, more ACK / NACK bits (eg, up to 20 bits with 5 component carriers) need to be supported in one uplink subframe. More specifically, Rel-8 TDD supports at most 4 ACK / NACK bits (single component carrier), and therefore 4 bits × 5 CC = 20 bits. In principle, more than 20 bits can be considered in a given TDD configuration. For ACK / NACK signaling, what container is used for multiple ACK / NACK bits, how to reduce the number of ACK / NACK bits in cases where coverage is limited, and the case of PDCCH errors A number of TDD specific issues need to be considered, including how to handle them.

For UL ACK / NACK feedback in LTE-A TDD, one UL subframe is
Multiple CCs in frequency domain (based on UE = sCC configuration), and multiple DL subframes in time domain (based on configured TDD configuration)
Associated with multiple PDSCH transmissions.

  Note that for TDD, DL / UL asymmetry in the time domain already exists in LTE Rel-8. Therefore, a set of mechanisms has already been specified to support ACK / NACK signaling corresponding to multiple DL subframes in a single UL subframe.

  More specifically, in Rel-8, both PUSCH and PUCCH can carry ACK / NACK corresponding to multiple DL subframes. The following modes are specified:

ACK / NACK bundling:
In this mode, an “AND” operation is performed over multiple ACK / NACK bits within a “bundling window” per codeword and one or two bundled ACK / NACK bits are generated for feedback. . Such a mode is useful for UEs with limited coverage.

ACK / NACK multiplexing:
In this mode, there is a channel selection method in which an “AND” operation is performed over a spatial codeword (ie, ACK / NACK spatial bundling) and DL throughput can be increased compared to using only ACK / NACK bundling. As a result, ACK / NACK multiplexing is achieved.

  Switching between these modes is UE specific and is a higher layer configuration.

  In Rel-8 TDD, a downlink specified index (DAI) is included in UL grants and most DL grants to handle potential error cases for ACK / NACK bundling. In order to balance error case handling, scheduling flexibility and other requirements, an associated DAI encoding method is specified.

  Considering that all these mechanisms have undergone careful optimization during Rel-8 standardization, as further described in R1-1101886, as a feasible solution, multiple ACK / Signaling NACK feedback can also be maintained. Therefore, it is desirable to reuse the existing mechanism specified in Rel-8 TDD as much as possible in LTE-A.

  Thus, one suggestion in R1-1101886 is that the ACK / NACK feedback mechanism specified in Rel-8 TDD should be reused as much as possible in LTE-A.

  In LTE-A TDD, the component carrier size increases the ACK / NACK payload as compared to Rel-8 TDD. Therefore, PUCCH format 2 can be considered as an additional container for the increased number of ACK / NACK bits (in addition to PUCCH format 1a / 1b and PUSCH).

  Based on the above observations, R1-1101886 further describes that the next ACK / NACK mode / container needs to be considered in LTE-A TDD.

  (A) As specified in Rel-8 TDD, in the case of small and medium ACK / NACK payloads in LTE-A TDD, PUCCH format 1a / 1b can be used as ACK / NACK container. The following ACK / NACK feedback modes can be supported.

Full bundling mode:
* Mainly used for a small number of ACK / NACK feedback bits, such as Rel-8 TDD.
* As in Rel-8 TDD, one or two bundled ACK / NACK bits are generated via an "AND" operation over multiple ACK / NACKs.
* In LTE-A TDD, such a mode is (still) meaningful for UEs with limited coverage and serves as an ACK / NACK fallback mode.

Channel selection mode:
* Mainly used for medium ACK / NACK bit numbers (eg up to 4 bits), like Rel-8 TDD.
* In LTE-A TDD, the channel selection mechanism specified in Rel-8 TDD can be fully used.
* In LTE-A TDD, further bundling is required to adapt the ACK / NACK payload to the multiplexing capacity.

  (B) In LTE-A TDD, PUCCH format 2 is a feasible ACK / NACK container for large ACK / NACK payloads.

  (C) In LTE-A TDD, switching between the modes is UE-specific and is configured in an upper layer like Rel-8 TDD.

  Furthermore, for ACK / NACK feedback, transmitting multiple PUCCH channels simultaneously results in non-optimal third metric characteristics and significantly increases UE power consumption. Therefore, ACK / NACK feedback must be based on a single PUCCH transmission, not simultaneous transmission of multiple PUCCHs.

  Further, in R1-1101886, for LTE-A TDD, PUCCH format 1a / 1b, PUCCH format 2, and PUSCH are considered as potential constraints on ACK / NACK feedback signaling, and both full bundling and channel selection modes Is required to be supported in PUCCH format 1a / 1b, and it is proposed that ACK / NACK feedback should be based on a single PUCCH transmission, not simultaneous transmission of multiple PUCCHs.

  Note that in Rl-101886, Rel-8 TDD specifies that ACK / NACK bundling maximizes ACK / NACK coverage by space and time domain bundling.

  In LTE-A TDD, ACK / NACK bundling is still an important factor for ACK / NACK feedback, especially when considering limited container capacity and potentially increased ACK / NACK overhead. Therefore, in order to reduce the ACK / NACK feedback overhead in the UL, the following bundling modes (and combinations thereof) must be considered as candidates.

(A) Spatial domain bundling:
* As in Rel-8 TDD, an "AND" operation is performed over the spatial codeword and generates a bundled ACK / NACK result.
* In terms of ACK / NACK overhead, this effectively compresses the ACK / NACK overhead from the spatial domain.
* Loss can be reduced from the viewpoint of DL throughput.

(B) Time domain bundling:
* In Rel-8 TDD, this bundling is already adopted for the “ACK / NACK bundling” mode.
* In LTE-A TDD, time domain bundling can also be considered.

(C) CC domain bundling:
* An "AND" operation is performed across multiple configured CCs to generate a bundled ACK / NACK.
* In terms of ACK / NACK overhead, this effectively compresses the ACK / NACK payload in the CC domain.
* ACK / NACK CC domain bundling is superior to ACK / NACK time domain bundling for DL throughput, especially for cell edge throughput.

  Further, in R1-1101886, it is proposed that time domain bundling and CC domain bundling (and combinations thereof) can be used in LTE-A TDD spatial domain bundling to reduce ACK / NACK overhead. ACK / NACK CC domain bundling incorporates priority from the perspective of DL throughput.

  In Rel-8 TDD, along with ACK / NACK bundling, a DAI solution is included in the DL / UL grant, and an encoding method is specified to handle potential error cases.

  In LTE-A TDD, DAI is required. This is because DAI uses UL ACK / NACK in LTE-A TDD to handle related error cases due to lack of DL grants within the “bundling window” (ie, the same motivation that exists in Rel-8 TDD). This is still an important factor for feedback. Furthermore, in LTE-A TDD, the “bundling window” can be extended to both the time domain and the CC domain.

  Regarding the bit width of the DAI field, in Rel-8 TDD, the bit width of DL / UL DAI is 2 bits. In LTE-A TDD, a similar DAI bit width is preferred to avoid additional TDD-specific overhead for most grants. Furthermore, with respect to the requirement for DTX vs. ACK probability, in Rel-8 TDD, in the case of ACK / NACK bundling, a DTX vs. ACK error may occur due to DL grant missing. The target DTA versus ACK probability is set to 1E-4. In Rel-10 TDD, the same reliability level can be targeted.

  Summarizing what has been described in R1-1101886 above, it is observed that in PUCCH format 1a / 1b transmission with ACK / NACK bundling it is not necessary to reserve PUCCH resources for each PDCCH. This is because there is only one (or two) ACK / NACK bits generated within each bundling window. As a result, only one PUCCH channel needs to be used for ACK / NACK transmission. This observation shows that a one-to-one mapping between PDCCH and PUCCH format 1a / 1b allocations (such as LTE Rel-8) is an excessive resource, especially in TDD systems configured for ACK / NACK bundling mode. It means inviting consumption.

  The exemplary embodiments of the present invention provide an effective way to overcome the inefficient allocation problem of PUCCH format 1a / 1b in LTE advanced TDD systems.

  Conventionally, a number of methods have been proposed for ACK / NACK resource allocation / reservation in LTE advanced type. However, these methods are primarily focused on FDD systems, not TDD systems.

One possible solution is to assume that the dynamic ACK / NACK space consists of two parts.
(A) a conventional dynamic ACK / NACK space defined in LTE Rel-8; and (b) a new dynamic cross-CC-ACK / NACK space.

  This solution makes it possible to use many-to-one mapping between CCE and ACK / NACK resources in dynamic cross-CC PUCCH resources that can be configured by higher protocol layers. This is considered as one form of PUCCH format 1a / 1b resource compression.

  3GPP TSG RAN WG1 Meeting # 59bis, R1-100243, Spain, Valencia, January 18-22, 2010, Source: Huawei, title “UL ACK / NACK resource allocation for carrier aggregation” should be M <N For example, it is stated that M ACK / NACK resources can be reserved for a total of N CCEs. This is considered that linked but unpaired DL CCs reduce implicit ACK / NACK resource overhead. Similar proposals have been made in 3GPP TSG RAN WG1 Meeting # 59bis, R1-100363, Valencia, Spain, 18-22 January 2010, Source: Panasonic, entitled “PUCCH resource allocation for carrier aggregation”.

  The PUCCH format 1a / 1b resource compression described above (ie, many-to-one mapping between CCE and PUCCH resources) is achieved via both implicit and explicit signaling and obtains more efficient resource compression Additional scheduling constraints may be introduced for this purpose. However, this solution is not optimal for use in LTE advanced TDD systems. That is, the TDD system has a greater degree of freedom for ACK / NACK resource mapping. This is because there is a mapping from multiple CCs and multiple DL subframes to one UE specific CC in one UL subframe. In addition, as described above, the ACK / NACK bundling operation provides a new property for PUCCH format 1a / 1b resource allocation that can be used for efficient resource compression.

  In accordance with the exemplary embodiments of the present invention, an efficient technique is provided for adapting to PUCCH format 1a / 1b resource allocation in LTE advanced TDD systems supporting CA.

  Before describing the exemplary embodiment of the present invention in more detail, FIG. 2, which is a simplified block diagram of various electronic devices and apparatus suitable for use in implementing the exemplary embodiment of the present invention, will be described. . In FIG. 2, the wireless network 1 communicates with a device such as a mobile communication device called UE 10 through a wireless link 11, a NodeB (base station), more specifically, a network access node such as eNB 12. To be done. The network 1 comprises a network control element (NCE) 14, which includes the MME / SGW functionality shown in FIG. 1A and yet another network such as a telephone network and / or a data communication network (eg, the Internet). Connection. The UE 10 is at least one non-transitory computer readable implemented as a memory (MEM) 10B that stores at least one computer or controller such as a data processor (DP) 10A and a computer instruction program (PROG) 10C. A memory medium and at least one suitable radio frequency (RF) transceiver 10D for two-way wireless communication with the eNB 12 via one or more antennas are provided. The eNB 12 also has at least one computer or memory such as a data processor (DP) 12A and at least one computer readable memory implemented as a memory (MEM) 12B that stores a computer instruction program (PROG) 12C. A medium and at least one suitable RF transceiver 12D for communicating with the UE 10 via one or more antennas (typically multiple when multiple input / multiple output (MIMO) operation is used). . The eNB 12 is coupled to the NCE 14 via the data / control path 13. The path 13 is embodied as the S1 interface shown in FIG. 1A. The eNB 12 is also coupled to another eNB via the data / control path 15 embodied as the X2 interface shown in FIG. 1A.

  For the description of the exemplary embodiment of the present invention, it is assumed that the UE 10 also comprises an ACK / NACK generation and transmission unit or module or function 10E that operates according to the exemplary embodiment of the present invention, and the eNB 12 is complementary. An ACK / NACK reception / interpretation unit or module or function 12E is provided. The eNB 12 also includes a PUCCH resource allocation unit or module or function 12F that operates as described below.

  Assume that at least one of PROGs 10C and 12C includes program instructions that, when executed by the associated DP, allow the device to operate according to the exemplary embodiments of the present invention, as described in detail below. Is done. That is, the exemplary embodiments of the present invention may be implemented at least in part by computer software executable by DP 10A of UE 10 and / or DP 12A of eNB 12, or by hardware or a combination of software and hardware (and firmware). Is done. For example, the ACK / NACK generation / transmission unit or module or function 10E, the ACK / NACK reception / interpretation unit or module or function 12E, and the PUCCH resource allocation unit or module or function 12F, respectively, as hardware or memory 10B and It can be implemented as executable code / software stored in 12B or as a combination of executable code / software and hardware (and firmware).

  In general, various embodiments of UE 10 include, but are not limited to, cellular phones, personal digital assistants (PDAs) with wireless communication capabilities, portable computers with wireless communication capabilities, and digital cameras with wireless communication capabilities. Image capturing device, game machine with wireless communication capability, music storage / playback device with wireless communication capability, Internet device capable of wireless Internet access and browsing, and portable unit or combination of such functions Including terminal.

  The computer readable MEMs 10B and 12B are of any type suitable for the local technical environment and may be any suitable data storage technology such as semiconductor-based memory devices, random access memory, read only memory, programmable read only memory. It is implemented using memory, flash memory, magnetic memory device and system, optical memory device and system, fixed memory and removable memory. DPs 10A and 12A are of any type suitable for the local technical environment and are based on non-limiting examples, general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), and multi-core processor architectures. Including a processor.

  Describing in detail an exemplary embodiment of the present invention, for PUCCH format 1a / 1b resource allocation in LTE advanced TDD, PUCCH format 1a / 1b resources are reserved with a granularity of one “ACK / NACK bundle” . “ACK / NACK bundle” means a set of TDD subframes and component carriers configured to form a subset of ACK / NACK feedback transmitted in the UL in response to received data (PDSCH) in the DL. Interpreted. “Configured to form a subset of ACK / NACK feedback” means that the configuration is made by eNB 12 in a typical (and non-limiting) application, using RRC signaling between eNB 12 and UE 10 Means it is realized and its properties are semi-static.

  In order to generalize this concept, the number of PUCCH format 1a / 1b resources reserved for each “ACK / NACK bundle” can be predefined or configured by higher protocol layers. The exact values are different for different ACK / NACK feedback / bundling schemes.

  For example, the total number of PUCCH format 1a / 1b resources allocated to a given UE 10 by the PUCCH resource allocation unit 12F depends on the number of ACK / NACK bundling mechanisms employed and “ACK / NACK bundles”. More specifically, the total number of PUCCH format 1a / 1b resources allocated to a given UE 10 is scaled by the number of “ACK / NACK bundles” depending on the UE specific configuration.

  For resource allocation, the location of PUCCH format 1a / 1b resources allocated to a given UE 10 is derived in a predetermined manner based on implicit or explicit resource allocation signaling (or a combination of implicit or explicit resource allocation signaling). The

  In addition, the start position of the PUCCH format 1a / 1b resource assigned to a given UE 10 is explicitly indicated by RRC signaling or some other UE specific parameter (eg ACK / NACK resource and UE specific search). Implicitly indicated by introducing a relationship between the start position of the space).

  The “UE-specific search space” corresponds to a predetermined set of control channel elements (CCE) that can be used to transmit a UE's PDCCH (in LTE Rel-8, the first CCE and PUCCH ACK / NACK resources and There is a one-to-one mapping between). The total CCE space (from the point of view of a single UE) is (i) a common search space (available for all UEs), (ii) a UE-specific search space (available for a given UE), and It is divided into search spaces that are not available at all for a given UE.

  Regarding the number of PUCCH format 1a / 1b resources allocated for different ACK / NACK bundling schemes, as described in R1-1101886 above, “ACK / NACK complete bundling” and “ACK / NACK time domain bundling” A number of methods can be used to support "/ CC domain bundling + channel selection".

  For example, in the case of ACK / NACK complete bundling (ie, a single “ACK / NACK bundle”), the number of PUCCH format 1a / 1b resources to be allocated may be predefined or configured in higher layers. it can.

  5A and 5B (described in further detail below), in a first embodiment, a single PUCCH format 1a / 1b resource is allocated to a given UE 10 by a PUCCH resource allocation unit 12F and The ringed ACK / NACK result is then transmitted via the allocated resource by the ACK / NACK generator / transmitter 10E. Furthermore, ACK / NACK bundling over spatial codewords can be applied. Furthermore, constellation point selection based on the value of the bundled ACK / NACK bits and the DAI of the last received PDCCH within the bundling window may be applied.

  In the second embodiment (see FIG. 5C), multiple PUCCH format 1a / 1b resources are allocated to a given UE 10 and the resources selected to transmit the bundled ACK / NACK result are: Depends on the last received PDCCH DAI value within the bundling window.

  Further, for example, in the case of ACK / NACK time domain bundling and / or CC domain bundling + channel selection, one PUCCH format 1a / 1b resource is allocated for each “ACK / NACK bundle”. Therefore, the total number of PUCCH format 1a / 1b resources allocated to a given UE 10 depends on the number of configured “ACK / NACK bundles”.

  Channel selection is performed among multiple assigned PUCCH format 1a / 1b resources, which are used to carry generated (bundled) ACK / NACK results.

  The normative rules that can be used for implicit resource allocation are described below.

In the LTE advanced TDD system, the location of the PUCCH format 1a / 1b resource assigned to a given UE 10 is determined in a predefined manner as follows.
f (UE _para , RA _index ), where
UE _para is a UE-specific parameter determined by RRC signaling or other UE-specific parameter (eg, UE-specific search space start position).
RA _index = 1,... M, where M is the total number of PUCCH format 1a / 1b resources allocated to a given UE 10, and M is the number of ACK / NACK bundles (which is Pre-defined or composed of higher layers).

As a normative implementation, f (UE _para , RA _index ) has the following formula:
f (UE _para , RA _index ) = (N _PUCCH + M · UE _para + RA _index ) mod C, or f (UE _para , RA _index ) = N _PUCCH + (M · UE _para + RA _index ) mod C
However, “·” means a “multiplication” operation, “mod” is modulo, and N _PUCCH and C are values defined by the PUCC resource allocation unit 12F of the eNB 12.

For ACK / NACK full bundling, one example implementation is as follows (shown in FIG. 5A).
A single PUCCH format 1a / 1b resource is allocated to a given UE10.
ACK / NACK bundling is applied across spatial codewords (one bundled ACK / NACK bit is generated per received CC / subframe).
Constellation point selection based on the value of the bundled ACK / NACK bit and the DAI of the last received PDCCH within the bundling window is applied as shown in the table of FIG. 5B.

For ACK / NACK full bundling, another example implementation is as follows (shown in FIG. 5C).
The number of PUCCH format 1a / 1b resources allocated to a given UE 10 is either predefined or configured in higher layers (denoted as M).
The resource used to send the bundled ACK / NACK result depends on the last received PDCCH DAI value within the bundling window.
One implementation is to use the (nmodM) PUCCH format 1a / 1b resource to carry the bundled ACK / NACK result, where n is the DAI of the last received PDCCH And M is the total number of PUCCH format 1a / 1b resources allocated to the UE 10 by the PUCCH resource allocation unit 12F of the eNB 12.

  The DAI encoding principle shown in FIGS. 5A and 5C is a co-pending application filed July 2, 2009 entitled “System and Method for ACK / NACK Feedback in TDD Communications” by the same inventor as the present patent application. This is described in more detail in US patent application Ser. No. 12 / 497,434, which is referred to below as a “commonly owned application”. The DAI encoding principle according to this commonly owned application is briefly outlined with reference to FIGS. 6-10.

  3GPP TSG RAN WG1 Meeting # 56bis, R1-091526, Korea, Seoul, March 23-27, 2009, Source: CATT, “UL ACK / NACK transmission in LTE-A” describes the concept of CC grouping ing. The number of DL component carriers and TDD subframes are configured to form C groups: c1, c2, c3, c3 in a prescribed manner. These C groups are then configured to generate group specific ACK / NACK / DTX information based on up to M input bits per group. Group specific ACK / NACK / DTX information is generated by bundling or multiplexing ACK / NACK bits corresponding to different component carriers CC, TDD subframes and spatial layers within the group. Regardless of the grouping shown in FIG. 6, (UL / DL) resource allocation grants transmitted over PDCCH corresponding to PDSCH of different component carriers and TDD subframes are encoded separately.

  FIG. 6 shows the concept of grouping. In the component carrier, the C groups, c1, c2, c3 and c4 are shown with different shading, and the TDD subframe is shown extending from left to right in the figure. NAK / ACK message information is indicated for groups c1-c4 with N / A displayed in different TDD subframes on the component carrier. Embodiments of the present invention based on commonly owned applications use this grouping concept as described in detail below.

  Previously proposed solutions do not consider the ACK / NACK signaling required to support LTE-A. More specifically, conventional solutions consider the error case handling required for individual PDCCH UL and DL grants when these dedicated resource allocation grants correspond to different component carriers (CC) and TDD subframes. Does not provide ACK / NACK uplink signaling in

  Embodiments of the present invention based on commonly owned applications provide features that are used together to perform ACK / NACK signaling on the PUCCH of LTE-A systems while addressing error cases. In one embodiment, a new DAI encoding is provided for the aggregated CC case used for LTE-A. In an embodiment method, an intra-group encoding solution for DAI is used. In another embodiment method, an inter-group encoding method for DAI is used. In both of these embodiments, two DAI bits are included in the PDCCH downlink grant. By using DAI encoding for the downlink grant, the UE 10 and the eNB 12 can handle error cases related to grouping of ACK / NACK feedback signals corresponding to a plurality of CC and TDD subframes. These error cases occur when a CC / TDD subframe specific PDCCH downlink grant assignment is not correctly received by the UE 10. Without the DAI encoding of the present invention based on a commonly owned application, the UE and eNB cannot handle these errors correctly.

  In another aspect of the present invention based on a commonly owned application, ACK / NACK signal feedback via PUCCH is implemented at the top of a configurable grouping. In one embodiment scheme, semi-static grouping is used. In another embodiment, dynamic grouping is used. Then, an ACK / NACK signal is sent over the UL to report the result of the previous DL transmission.

FIG. 7 is a simplified diagram illustrating a method for encoding DAI in the method of the “In Group” embodiment. In this exemplary embodiment, DAI encoding is group specific, i.e., DAI encoding begins again for each group. In that embodiment, a DAI counter is used and its count is equal to the number of previous grants in the group. For each group, the DAI counter is incremented from 0 to 1,... N _i -1, where N _i is the number of DL grants in the i th group. DAI counters are numbered for each group first in the frequency domain and in the time domain, with numbers starting with zero.

Equation 1 represents the value of the DAI counter.
DAICounter = 0, 1, 2,... N _i −1 (1)
However, N _i = the number of DL grants in the i th group, then the DAI value is obtained by applying a modulo operation, where MOD 4 is used.
Equation 2 is the equation for this step.
DAIValue = DAICounter MOD 4 (2)

  FIG. 7 shows a non-limiting example of a method based on a commonly owned application. Here, four CCs and four subframes are divided into four groups. The four groups have 2, 1, 1, and 2 DL grants, respectively. These groups are designated as group 1, group 2, group 3 and group 4 by shading in FIG.

  For the first group, the first DL grant has no precursor, so the count is zero. In the second DL grant in the first group, the count is one. In group 2, there is only one DL grant and therefore receives a DAI count of zero. Similarly, group 3 has only one DL grant and receives a count of zero. In group 4, the first DL grant starts with a count of zero and then the second DL grant receives a DAI count of one. The MOD 4 operation does not change the count value in this example, so the DAI values are 0 and 1 for group 1, 0 for group 2, 0 for group 3, and 0 for group 4, respectively. , Shown as 1.

In another embodiment method for DAI encoding according to the present invention of commonly owned applications, “inter-group” encoding is used. In this solution, the DAI counter starts at 0 and increments to the total DL grant number in the UE receive band for the frequency domain and in the scheduling window for the time domain. That is, the DAI counter is not reset for each group. Thus, DAI counter = 0, 1, 2,... N−1, where N is the total DL grant observed for all groups. Equation 3 is a simple equation. After the DAI count is determined, a MOD 4 operation is performed to obtain the DAI value. Equation 4 gives this equation.
DAICounter = 0, 1, 2, ... N-1 (3)
N is the total number of DL grants.
DAIValue = DAICounter MOD 4 (4)

  FIG. 8 shows an application of this embodiment as a non-limiting case for illustration. Also in FIG. 8, four groups are shown in the scheduling window with four component carriers and four TDD subframes. Groups are indicated by shaded group 1, group 2, group 3 and group 4. The numerical values shown in some blocks represent the DAI values determined using the inter-group method embodiment as follows.

  In group 1, there are two DL grants. In group 2, there is one downlink grant. In group 3, there is one DL grant and in group 4, there are two DL grants. Thus, in this exemplary case, there are a total of 6 DL grants. When using the inter-group method for DAI counters, the counter is incremented from 0 to 5. Applying the DAI value method step using MOD 4, the DAI values shown in FIG. 8 are, for example, 0 for group 1, 2 for group 2, 2 for group 3, and 0 for group 4. 1 is obtained. These values are shown in the appropriate CC / TDD subframe block of FIG.

  Two alternative embodiment DAI encoding schemes are shown in FIGS. Since the DAI encoding scheme is still formed as a 2-bit DAI value, using a system that conforms to LTE Rel-8 in TDD mode does not cause any backward compatibility issues. The use of embodiments of the present invention based on commonly owned applications is compatible with the use of Rel-8 devices.

  In another aspect of embodiments of the present invention based on a commonly owned application, a method for providing feedback of ACK / NACK information is disclosed. Two alternative method embodiment solutions are provided that address the trade-off between system throughput (efficiency) of the LTE-A system in TDD mode and UL coverage.

  In one method embodiment, semi-static grouping is used to provide ACK / NACK feedback. In this solution, the C group and M subgroup are defined by higher layer operation. This information is sent to the UE as a control bit in the initialization message. This solution is used in connection with the inter-group or intra-group DAI encoding scheme described above.

After the grouping is configured, the UE transmits ACK / NACK information based on the following steps.
Step # 1: Within each subgroup, ACK / NACK bits are first bundled in the space / CC / time domain to generate M ACK / NACK feedback bits.
Step # 2: Apply channel selection technique to carry M ACK / NACK feedback bits per group. In another aspect, other techniques are used to carry M ACK / NACK feedback bits per group.
Step # 3: After the channel is selected, the UE transmits ACK / NACK / DTX feedback corresponding to the C parallel group via the selected or predefined channel.

  FIG. 9 shows various configurations 1-8 of predefined grouping patterns that are combined with the ACK / NACK signaling scheme of the embodiment to provide feedback of ACK / NACK information from the UE via PUCCH, for example. The shades indicate different groups, and the circles indicate the subgroups to which domains ACK / NACK bundling applies. For example, in configuration 7, two groups and four subgroups per group are configured. Within each group, four ACK / NACK / DTX feedback information is generated via ACK / NACK bundling within each subgroup. Channel selection is then performed within each group to carry four ACK / NACK / DTX feedback signals. Finally, all ACK / NACK / DTX feedback signals are transmitted over the parallel selected PUCCH format 1b channel.

  FIG. 10 shows the pattern 5 of FIG. 9 in more detail. In FIG. 10, DAI encoding is applied to “between groups”. The ACK / NACK bits corresponding to all observed DL grants (observed by UE 10) are organized into two groups and three subgroups per group as shown in FIG. Each subgroup provides one ACK / NACK / DTX status indication by using ACK / NACK bundling. In order to transmit this information, appropriate channel and QPSK constellation point selection (or typically an encoding scheme) is performed within each group to carry ACK / NACK feedback corresponding to the three subgroups. Finally, ACK / NACK / DTX feedback information corresponding to the two groups is transmitted in parallel using two PUCCH format 1b channels or using another encoding scheme corresponding to the two groups. The The two arrows in FIG. 10 indicate parallel (temporally simultaneous) uplink transmission on the two channels.

  Error handling is required when the UE does not correctly observe all DL grants transmitted by the eNB. While the last N DL grants are missing at the same time, a bundled ACK signal may be generated. As an example, considering the case where 10 DL designations are scheduled within one “scheduling window”, the 2 bits of the DAI value are 0, 1, 2, 3, 0, 1, 2, 3 respectively. , 0 and 1. If the UE only sees or receives the first 7 DL grants and the last 3 are missing, 7 from the UE side with DAI values 0, 1, 2, 3, 0, 1 and 2 DL grant is observed. In this example, since the DAI index is continuous, the UE is unaware of missing detection of the other three DL grants.

  In this error case, the uplink ACK / NACK signal transmitted by bundling does not correspond to true ACK information. The following method embodiment is provided as an embodiment of the present invention based on a commonly owned application used to handle this error condition known as the “DTX vs. ACK” error condition.

  First, as a simple case assumption, the most likely case is that the last DL grant is missing. The risk of missing the last N consecutive DL grants is very low, so such a case is not addressed here.

  In one embodiment, the UE explicitly indicates the last received PDCCH DL grant by always using the PUCCH resource corresponding to the last received DL grant. This solution or implementation is suitable for the case of at least ORT (orthogonal resource transmission) for PUCCH diversity with multiple antennas. In this signaling diversity solution, the UE uses PUCCH diversity based on the use of multiple PUCCH format 1a / 1b resources. In such a case, the UE selects the PUCCH resource corresponding to the last observed or received DL grant, and thus the eNB that receives the PUCCH is the last DL grant received by the UE. I understand.

  This solution or implementation is also suitable for the case of at least SCTD (Single Carrier Transmit Diversity) for PUCCH diversity with multiple antennas. SCTD is also referred to as an ORT scheme in the description of 3GPP Ran1. In SCTD or ORT, diversity gain is obtained by transmitting the same PUCCH information from multiple antennas in a UE with orthogonal PUCCH resources. This scheme is under consideration as one candidate transmit diversity scheme for LTE-A PUCCH channels. In such cases, multiple orthogonal PUCCH channels are required for multiple antennas. In the method of this embodiment for implicitly signaling the last received DL grant, the UE selects the PUCCH resource corresponding to the last observed or received DL grant and sends it to the ORT transmission. It can be used as one required PUCCH channel. Upon receiving the PUCCH, the eNB that receives the PUCCH knows which DL grant is the last DL grant received by the UE. For example, in the non-limiting exemplary assumption that there is a group of C = 1 and the UE has two antennas, in the ORT case, the UE may The PUCCH channel is selected, but the PUCCH channel is selected for the other antennas based on the last received DL grant.

  In another solution, the UE implicitly indicates the DAI value “V” of the last received PDCCH in each group by channel selection.

  In this alternative solution, the UE performs PUCC resource selection in a manner that implicitly indicates the value V (otherwise, the UE is free to choose any one of the PDCCH channels in the selected subgroup. select). Upon receiving the UL signal, the eNB knows which is the last observed DL grant on the UL side, and the eNB and the UE have a common understanding regarding the status of the received DL grant.

  To make this selection, one subgroup is selected through channel selection within each subgroup. In the example shown here, if the last received DL grant DAI is 2, the UE selects the third resource in the selected subgroup and transmits the ACK / NACK result. Can do. In this way, the eNB knows which is the last DL grant that the UE has received securely.

  Accordingly, embodiments of the present invention based on commonly owned applications provide at least two methods for performing DAI encoding, multiple methods for providing ACK / NACK feedback, and methods for transmitting information. These embodiments, for example, use TDD and aggregate CC in the PUCCH channel while maintaining full compatibility with Release 8 of the LTE standard, because the DAI value remains 2 bits. Used to provide error handling and ACK / NACK support for the A system. In addition, CC is “pure counter” at first, and since encoding of DAI counter is used, “affirmative scheduling” is unnecessary in the time domain.

  The method described based on the commonly owned application is also a means for handling “last DL grant missing” in various alternative embodiments.

  The method described based on the commonly owned application is also an embodiment of ACK / NACK feedback obtained from the UE using either semi-static grouping or dynamic grouping. Semi-static grouping is determined at a higher level and the scheduler commands the UE to use an appropriate pattern to improve ACK / NACK feedback efficiency taking into account traffic, signal strength, quality, etc. . In dynamic grouping, the pattern used on the UE side is based on the designation each time to further improve ACK / NACK efficiency. However, the dynamic solution requires DAI signaling in the UL message, thus increasing the use of resources in signaling traffic and adding complexity to the UE.

  It is noted that the DAI encoding described above with reference to FIGS. 6-10 represents a number of exemplary and non-limiting solutions for providing DAI encoding with respect to FIGS. 5A and 5C of the exemplary embodiment of the present invention. I want.

  The use of the exemplary embodiments of the present invention provides a number of technical operations and effects.

  For example, using the exemplary embodiment of the present invention provides high PUCCH resource efficiency by avoiding unnecessary PUCCH resource allocation. In addition, the resource collision opportunities are reduced and can be controlled by the eNB 12. Furthermore, the signaling overhead for resource allocation is reduced. In addition, those exemplary embodiments are compatible with the channel selection and ACK / NACK bundling modes as described above with respect to R1-101886 and the full ACK / NACK bundling mode described in R1-101886.

  FIG. 11A is a logic flow diagram illustrating the results of method operations and execution of computer program instructions according to an exemplary embodiment of the present invention. According to these exemplary embodiments, the method is physically performed at a granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle in block 11A-1 when in time division duplex operation mode with the user equipment. Allocating a physical uplink control channel resource by reserving a common uplink control channel resource. In block 11B-1, there is the step of transmitting an indication of the allocated physical uplink control channel resource from the network access node to the user equipment.

  FIG. 11B is further a logic flow diagram illustrating the results of another method of operation and execution of computer program instructions according to an exemplary embodiment of the present invention. The method performs the step of obtaining an allocation of a single physical uplink control channel format 1a / 1b resource at the user equipment at block 11A-2, where the physical uplink control channel resource is 1 Reserved with a granularity of two acknowledgment / negative acknowledgment (ACK / NACK) bundles. Block 11B-2 has the step of performing ACK / NACK bundling over the spatial codeword, where one bundled ACK / NACK bit is generated per received component carrier / subframe. . Block 11C-2 includes on the uplink based on the value of the bundled ACK / NACK bit and the value of the downlink designation index of the last received physical downlink control channel in the ACK / NACK bundle. There is a step of selecting a constellation point for transmission of.

  FIG. 11C is further a logic flow diagram illustrating the results of still another method of operation and execution of computer program instructions according to an exemplary embodiment of the present invention. According to these exemplary embodiments, the method performs the step of obtaining, at block 11A-3, a plurality of physical uplink control channel format 1a / 1b resource assignments at the user equipment, wherein physical The common uplink control channel resource is reserved with a granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle. In block 11B-3, one of a plurality of physical uplink control channel format 1a / 1b resources is selected and the downlink designation index of the last received physical downlink control channel in the ACK / NACK bundle. Based on the value, a bundled ACK / NACK result is transmitted.

  The various blocks shown in FIG. 11 are viewed as method steps and / or operations resulting from the operation of computer program code and / or as a plurality of combined logic circuit elements configured to perform related functions. It is.

  An exemplary embodiment is also a device of the type having at least one processor and a memory containing computer program code, the memory and computer program code being in conjunction with the processor when the device is at least with a user device. Allocating physical uplink control channel resources by reserving physical uplink control channel resources at the granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle when in split duplex mode of operation; and the allocated physical Including an apparatus configured to cause an indication of a general uplink control channel resource to be transmitted from a network access node to a user equipment.

  The exemplary embodiment also reserves physical uplink control channel resources with granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle in response to operation in a time division duplex operation mode with the user equipment. And means for allocating a physical uplink control channel resource by means of; and means for transmitting an indication of the allocated physical uplink control channel resource from a network access node to a user equipment. To do.

  An exemplary embodiment is also a device of the type having at least one processor and a memory containing computer program code, the memory and the computer program code, together with the processor, comprising at least a single physical device. The uplink uplink control channel format 1a / 1b resource allocation is obtained at the user equipment, and its physical uplink control channel resource is reserved with granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle; spatial codeword ACK / NACK bundling over a received component carrier / subframe is generated with one bundled bit; and the value of the bundled ACK / NACK bit, and ACK / Also included is an apparatus configured to select a constellation point for transmission on the uplink based on the value of the downlink designated index of the last received physical downlink control channel in the ACK bundle. .

  The exemplary embodiment is also a means for obtaining a single physical uplink control channel format 1a / 1b resource allocation at the user equipment, where the physical uplink control channel resource is one confirmation / denial. Means that are reserved at the granularity of the acknowledgment (ACK / NACK) bundle; means for performing ACK / NACK bundling across spatial codewords, one bundling per received component carrier / subframe Based on the value of the bundled ACK / NACK bit and the value of the downlink designation index of the last received physical downlink control channel in the ACK / NACK bundle. Up It encompasses apparatus provided with; means and for selecting the constellation points for transmission links.

  An exemplary embodiment is also a device of the type having at least one processor and a memory including computer program code, the memory and the computer program code, together with the processor, including at least a plurality of physical Uplink control channel format 1a / 1b resource allocation is obtained at the user equipment, and its physical uplink control channel resource is reserved with granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle; and ACK / NACK bundle Select one of a plurality of physical uplink control channel format 1a / 1b resources based on the value of the downlink designation index of the physical downlink control channel received last in Te, also encompasses an apparatus configured to so as to transmit the bundling been ACK / NACK result.

  The exemplary embodiment is also a means for obtaining allocation of a plurality of physical uplink control channel format 1a / 1b resources at a user equipment, wherein the physical uplink control channel resource is one confirmation / negative confirmation. (ACK / NACK) means that are reserved at the granularity of the bundle; based on the value of the downlink received index of the last received physical downlink control channel in the ACK / NACK bundle, a plurality of physical Means for selecting one of the uplink control channel format 1a / 1b resources and transmitting the bundled ACK / NACK result.

  In general, the various exemplary embodiments are implemented in hardware or special purpose circuits, software, logic or combinations thereof. For example, some aspects may be embodied in hardware while other aspects are embodied in firmware or software running on a controller, microprocessor, or other computing device, but the invention is not limited thereto. Not. Although various aspects of exemplary embodiments of the invention have been illustrated and described, as block diagrams, flowcharts, or using other pictorial representations, those blocks, apparatus, systems, and techniques described herein have been described. Or, it should be understood that the method is embodied in hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controllers, or other computing devices, or combinations thereof, as non-limiting examples.

  At least some aspects of the exemplary embodiments of the invention are implemented in various components such as integrated circuit chips and modules, and the exemplary embodiments of the invention are implemented in an apparatus implemented as an integrated circuit. Please understand that. The one or more integrated circuits may be configured to operate in accordance with an exemplary embodiment of the invention, one or more data processors, one or more digital signal processors, a baseband circuit, and a high frequency circuit; Circuitry (and possibly firmware) for implementing at least one of the following.

  Various modifications and adaptations to the above exemplary embodiments of the present invention will become apparent to those skilled in the art when the above description is read in conjunction with the accompanying drawings. However, all such modifications are encompassed within the scope of the exemplary embodiments of the present invention.

  For example, although the exemplary embodiments of the present invention have been described above with respect to (UTRAN-LTE-A) systems, they are not limited to use only with this one particular type of wireless communication system, and other wireless communication systems. It is clear that it can be used effectively.

  “Connected”, “coupled” or variations thereof means a direct or indirect connection or coupling between two or more elements and is “connected” or “coupled” together Note that it also encompasses the presence of one or more intermediate elements between two elements. The coupling or connection between elements is physical, logical or a combination thereof. By way of some non-limiting and non-exhaustive example, the two elements used herein include the use of one or more wires, cables and / or printed electrical connections, as well as the high frequency region, microwave region and The use of electromagnetic energy, such as electromagnetic energy having a wavelength in the optical region (both visible and invisible) is considered to be “connected” or “coupled” together.

  Furthermore, the various names (eg, ACK / NACK bundling, DAI, etc.) used for the parameters, information elements and other concepts described above are not so limited. This is because the various parameters, information elements and concepts can be identified by any suitable name. Further, the formulas, equations and formulas used in a particular application may differ from those expressly expressed herein. Further, various names (eg, PDCCH, PUCCH, PUCCH format 1a / 1b, etc.) assigned to different channels and channel types are not limited thereto. This is because these various channels and channel types can be identified by any suitable name.

  Moreover, certain features of the various non-limiting exemplary embodiments of the present invention can be used effectively without the corresponding use of other features. Accordingly, the foregoing description is merely illustrative of the principles, teachings, and exemplary embodiments of the present invention and is not limited thereto.

1: Wireless network 10: UE
10A: Data processor (DP)
10B: Memory (MEM)
10C: Computer instruction program (PROG)
10D: Radio frequency (RF) transceiver 10E: ACK / NACK generation / transmission unit 11: Wireless link 12: eNB
12A: DP
12B: MEM
12C: PROG
12D: RF transceiver 12E: ACK / NACK reception / interpretation unit 12F: PUCCH resource allocation unit 13: Data / control path 14: Network control element (NCE)
14A: DP
14B: MEM
14C: PROG

Claims (24)

Allocating physical uplink control channel resources by reserving physical uplink control channel resources with granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle when in a time division duplex operation mode with a user equipment When,
Transmitting an indication of the allocated physical uplink control channel resource from a network access node to a user equipment;
With a method.   The method according to claim 1, wherein the physical uplink control channel resource is a format 1a / 1b resource that is reserved for each ACK / NACK bundle and is at least one predefined and configured. .   The ACK / NACK bundle is a time division duplex subframe configured to form a subset of ACK / NACK feedback to be transmitted by a user equipment in the uplink in response to data received in the downlink (one or 3. A method according to claim 1 or 2, comprising a set of component (s) and component carrier (s).   A single physical uplink control channel format 1a / 1b resource is allocated to a given user equipment and time division duplex subframe (s) and component carriers (to form a single ACK / NACK bundle) 4. The method according to any one of claims 1 to 3, comprising one or more sets.   5. The constellation point selection is performed based on a value of a bundled ACK / NACK bit and a value of a downlink designation index of a physical downlink control channel received last in an ACK / NACK bundle. the method of.   Assign multiple physical uplink control channel format 1a / 1b resources to a given user equipment and set a set of time division duplex subframe (s) and component carrier (s) to at least one 4. A method according to any one of claims 1 to 3, comprising an ACK / NACK bundle.   In order to transmit a bundled ACK / NACK based on the value of the downlink designation index of the last received physical downlink control channel in the ACK / NACK bundle, a plurality of physical uplink control channel formats 1a / The method of claim 6, wherein one of the 1b resources is selected.   User equipment assigns at least one physical uplink control channel format 1a / 1b resource per ACK / NACK bundle for at least one of ACK / NACK time domain bundling and component carrier domain bundling in channel selection The total number of physical uplink control channel formats 1a / 1b resources allocated to the user equipment depends on the number of configured ACK / NACK bundles of the user equipment, and the channel selection is made up of a plurality of allocated physical uplinks The method of claim 1, wherein the method is performed between control channel resources and used to carry a bundled ACK / NACK result. The location of the physical uplink control channel format 1a / 1b resource assigned to a given user equipment (UE) is determined based on the following equation:
f (UE _para , RA _index ), where
UE _para is a UE specific parameter and RA _index = 1,... M, where M is the sum of physical uplink control channel format 1a / 1b resources allocated to a given UE 10 The method of claim 1, wherein the number is M and M corresponds to a number of ACK / NACK bundles.   A non-transitory computer readable medium comprising software program instructions, wherein execution of the software program instructions on at least one data processor results in the execution of operations including execution of the method of any of claims 1-9. . A processor;
A memory containing computer program code;
The memory and the computer program code, together with the processor, the device at least
Allocate physical uplink control channel resources by reserving physical uplink control channel resources with granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle when in time division duplex mode of operation with user equipment; And transmitting an indication of the allocated physical uplink control channel resource from the network access node to the user equipment,
A device configured to cause   12. The apparatus of claim 11, wherein the physical uplink control channel resource is a format 1a / 1b resource that is reserved for each ACK / NACK bundle and is at least one predefined and configured. .   The ACK / NACK bundle is a time division duplex subframe configured to form a subset of ACK / NACK feedback to be transmitted by a user equipment in the uplink in response to data received in the downlink (one or 13. Apparatus according to claim 11 or 12, comprising a set of) and component carrier (s).   A single physical uplink control channel format 1a / 1b resource is allocated to a given user equipment and time division duplex subframe (s) and component carriers (to form a single ACK / NACK bundle) 14. A device according to any one of claims 11 to 13, comprising one or more sets.   15. The constellation point selection is performed based on a value of a bundled ACK / NACK bit and a downlink designation index value of a physical downlink control channel received last in an ACK / NACK bundle. Equipment.   Assign multiple physical uplink control channel format 1a / 1b resources to a given user equipment and assign a set of time division duplex subframe (s) and component carrier (s) to a single 14. Apparatus according to any one of claims 11 to 13, configured to form an ACK / NACK bundle.   In order to transmit a bundled ACK / NACK based on the value of the downlink designation index of the last received physical downlink control channel in the ACK / NACK bundle, a plurality of physical uplink control channel formats 1a / The apparatus of claim 16, wherein one of the 1b resources is selected.   Allocate one physical uplink control channel format 1a / 1b resource per ACK / NACK bundle for at least one of ACK / NACK time domain bundling and component carrier domain bundling in channel selection, and Assigned physical uplink control channel format 1a / 1b so that the total number of resources depends on the number of configured ACK / NACK bundles of the user equipment, and the channel selection is a plurality of assigned physical uplink control 12. The apparatus of claim 11, wherein the apparatus performs between channel resources and uses it to carry a bundled ACK / NACK result. The location of the physical uplink control channel format 1a / 1b resource assigned to a given user equipment (UE) is determined based on the following equation:
f (UE _para , RA _index ), where
UE _para is a UE specific parameter and RA _index = 1,... M, where M is the sum of physical uplink control channel format 1a / 1b resources allocated to a given UE 10 The apparatus of claim 11, wherein the number is M and M corresponds to a number of ACK / NACK bundles. Obtaining an allocation of a single physical uplink control channel format 1a / 1b resource at the user equipment, wherein the physical uplink control channel resource is granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle A stage that is reserved at
Performing ACK / NACK bundling over spatial codewords such that one bundled bit is generated per received component carrier / subframe;
A constellation point for transmission on the uplink based on the value of the bundled ACK / NACK bit and the value of the downlink designated index of the last received physical downlink control channel in the ACK / NACK bundle Selecting a stage,
With a method.   The ACK / NACK bundle is a time division duplex subframe configured to form a subset of ACK / NACK feedback to be transmitted by a user equipment in the uplink in response to data received in the downlink (one or 21. The method of claim 20, comprising a set of) and component carrier (s). Obtaining allocation of multiple physical uplink control channel format 1a / 1b resources at a user equipment, wherein the physical uplink control channel resources are at the granularity of one acknowledgment / negative acknowledgment (ACK / NACK) bundle The stage being reserved,
Based on the value of the downlink designation index of the last received physical downlink control channel in the ACK / NACK bundle, select one of a plurality of physical uplink control channel formats 1a / 1b resources to Transmitting a ringed ACK / NACK result;
With a method.   (Nmod M) Physical uplink control channel format 1a / 1b resource is used to carry the bundled ACK / NACK result, where n is the downlink of the last received physical downlink control channel 23. The method of claim 22, wherein the specified index value and M is the total number of physical uplink control channel format 1a / 1b resources allocated to the user equipment.   The ACK / NACK bundle is a time division duplex subframe configured to form a subset of ACK / NACK feedback to be transmitted by a user equipment in the uplink in response to data received in the downlink (one or 24. A method according to claim 22 or 23, comprising a set of component (s) and component carrier (s).

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