Source: https://patents.google.com/patent/US10333597B2/en
Timestamp: 2020-01-20 15:01:55
Document Index: 439076632

Matched Legal Cases: ['Application No. 61', 'Application No. 11150088', 'Application No. 14171879', 'Application No. 10', 'Application No. 1160', 'Application No. 2011800287631', 'Application No. 2014', 'Application No. 2012124082']

US10333597B2 - Method and system for enabling block bundling in LTE-A systems - Google Patents
Method and system for enabling block bundling in LTE-A systems Download PDF
US10333597B2
US10333597B2 US15/363,930 US201615363930A US10333597B2 US 10333597 B2 US10333597 B2 US 10333597B2 US 201615363930 A US201615363930 A US 201615363930A US 10333597 B2 US10333597 B2 US 10333597B2
US15/363,930
US20180006691A9 (en
US20170141824A1 (en
2014-12-15 Priority to US14/571,171 priority patent/US9516655B2/en
2016-11-29 Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
2016-11-29 Priority to US15/363,930 priority patent/US10333597B2/en
2016-11-29 Assigned to SAMSUNG ELECTRONICS CO., LTD reassignment SAMSUNG ELECTRONICS CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIU, LINGJIA, NAM, YOUNG-HAN, ZHANG, JIANZHONG
2017-05-18 Publication of US20170141824A1 publication Critical patent/US20170141824A1/en
2018-01-04 Publication of US20180006691A9 publication Critical patent/US20180006691A9/en
2019-06-25 Publication of US10333597B2 publication Critical patent/US10333597B2/en
A base station includes a transmit path circuitry to transmit an indication of whether a subscriber station is configured with precoding matrix indicator/rank indicator (PMI/RI) reporting. The transmit path circuitry sets a pre-coding granularity to multiple physical resource blocks in the frequency domain to perform a same pre-coding over a bundled resource block if the subscriber station is configured with PMI/RI reporting. The bundled resource block includes multiple consecutive physical resource blocks in the frequency domain. The base station also includes a receive path circuitry to receive feedback from the subscriber station.
This application is a continuation of U.S. Non-Provisional patent application Ser. No. 14/571,171 filed Dec. 15, 2014 and entitled METHOD AND SYSTEM FOR ENABLING RESOURCE BLOCK BUNDLING IN LTE-A SYSTEMS, now U.S. Pat. No. 9,516,655, which is a continuation of U.S. Non-Provisional patent application Ser. No. 12/970,717 filed Dec. 16, 2010 and entitled METHOD AND SYSTEM FOR ENABLING RESOURCE BLOCK BUNDLING IN LTE-A SYSTEMS, now U.S. Pat. No. 9,253,784, which claims priority to U.S. Provisional Patent Application No. 61/294,010 filed Jan. 11, 2010 and entitled “RESOURCE BLOCK BUNDLING FOR LTE-A SYSTEMS.” The content of the above-identified patent documents is hereby incorporated by reference.
The present application relates generally to wireless communications and, more specifically, to a method and system for enabling resource block bundling.
In 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) systems, Orthogonal Frequency Division Multiplexing (OFDM) is adopted as a downlink (DL) transmission scheme.
A base station is provided. The base station includes a transmit path circuitry configured to transmit an indication of whether a subscriber station is configured with precoding matrix indicator/rank indicator (PMI/RI) reporting. The transmit path circuitry is configured to set a pre-coding granularity to multiple physical resource blocks in the frequency domain to perform a same pre-coding over a bundled resource block if the subscriber station is configured with PMI/RI reporting. The bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain. The base station also includes a receive path circuitry configured to receive feedback from the subscriber station.
A method of operating a base station is provided. The method includes transmitting an indication of whether a subscriber station is configured with precoding matrix indicator/rank indicator (PMI/RI) reporting, and setting a pre-coding granularity to multiple physical resource blocks in the frequency domain to perform a same pre-coding over a bundled resource block if the subscriber station is configured with PMI/RI reporting. The bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain. The method also includes receiving feedback from the subscriber station.
A subscriber station is provided. The subscriber station includes a receive path circuitry configured to receive from a base station an indication of whether the subscriber station is configured with precoding matrix indicator/rank indicator (PMI/RI) reporting, and perform a channel estimation over a bundled resource block if the subscriber station is configured with PMI/RI reporting. The bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain. The subscriber station also includes a transmit path circuitry configured to transmit the channel estimation as feedback to the base station.
A method of operating a subscriber station is provided. The method includes receiving from a base station an indication of whether the subscriber station is configured with precoding matrix indicator/rank indicator (PMI/RI) reporting, and performing a channel estimation over a bundled resource block if the subscriber station is configured with PMI/RI reporting. The bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain. The method also includes transmitting the channel estimation as feedback to the base station.
A base station is provided. The base station includes a transmit path circuitry configured to transmit an indication of either a first feedback mode or a second feedback mode to a subscriber station. The transmit path circuitry is also configured to set a pre-coding granularity to multiple physical resource blocks in the frequency domain to perform a same pre-coding over a bundled resource block if the first feedback mode is indicated by the indicator. The bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain. The base station also includes a receive path circuitry configured to receive feedback from the subscriber station.
A method of operating a base station is provided. The method includes transmitting an indication of either a first feedback mode or a second feedback mode to a subscriber station and receiving feedback from the subscriber station, and setting a pre-coding granularity to multiple physical resource blocks in the frequency domain to perform a same pre-coding over a bundled resource block if the first feedback mode is indicated by the indicator. The bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain. The method also includes receiving feedback from the subscriber station.
A subscriber station is provided. The subscriber station includes a receive path circuitry configured to receive an indication of either a first feedback mode or a second feedback mode from a base station, and perform a channel estimation over a bundled resource block if the first feedback mode is indicated by the indicator. The bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain. The subscriber station also includes a transmit path circuitry configured to transmit the channel estimation as feedback to the base station.
FIG. 2 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) transmitter according to one embodiment of this disclosure;
FIG. 3 is a high-level diagram of an OFDMA receiver according to one embodiment of this disclosure;
FIG. 5 illustrates a spatial division multiple access (SDMA) scheme according to an embodiment of this disclosure;
FIGS. 6 and 6A through 6C collectively illustrate dedicated reference signal (DRS) patterns that support two and four layer transmissions according to an embodiment of this disclosure;
FIG. 7 illustrates DRS patterns that support eight layer transmissions according to an embodiment of this disclosure;
FIG. 8 illustrates a table depicting the use of a one bit signaling to turn on or turn off resource block (RB) bundling according to an embodiment of this disclosure;
FIG. 9 illustrates a table depicting the use of available downlink control information (DCI) code-points to turn on or turn off resource block RB bundling according to an embodiment of this disclosure;
FIG. 10 illustrates subbands bundled together according to an embodiment of this disclosure;
FIG. 11 illustrates a DCI format 2C according to an embodiment of this disclosure;
FIG. 12 illustrates a table depicting restricted subsets according to an embodiment of this disclosure;
FIG. 13 illustrates a table depicting a mapping of states in a restricted subset to codepoints in DCI format 2C according to an embodiment of this disclosure;
FIG. 14 illustrates a table depicting restricted subsets according to another embodiment of this disclosure;
FIG. 15 illustrates a table depicting a mapping of states in a restricted subset to codepoints in DCI format 2C according to another embodiment of this disclosure;
FIG. 16 illustrates a method of operating a base station according to an embodiment of this disclosure;
FIG. 17 illustrates a method of operating a subscriber station according to an embodiment of this disclosure;
FIG. 18 illustrates a method of operating a base station according to another embodiment of this disclosure; and
FIG. 19 illustrates a method of operating a subscriber station according to another embodiment of this disclosure.
FIGS. 1 through 19, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless communication system.
With regard to the following description, it is noted that the Long Term Evolution (LTE) term “node B” is another term for “base station” used below. Also, the LTE term “user equipment” or “UE” is another term for “subscriber station” used below.
FIG. 1 illustrates exemplary wireless network 100, which transmits messages according to the principles of the present disclosure. In the illustrated embodiment, wireless network 100 includes base station (BS) 101, base station (BS) 102, base station (BS) 103, and other similar base stations (not shown). Base station 101 is in communication with Internet 130 or a similar IP-based network (not shown). Base station 102 provides wireless broadband access to Internet 130 to a first plurality of subscriber stations within coverage area 120 of base station 102. The first plurality of subscriber stations includes subscriber station 111, which may be located in a small business (SB), subscriber station 112, which may be located in an enterprise (E), subscriber station 113, which may be located in a WiFi hotspot (HS), subscriber station 114, which may be located in a first residence (R), subscriber station 115, which may be located in a second residence (R), and subscriber station 116, which may be a mobile device (M), such as a cell phone, a wireless laptop, a wireless PDA, or the like.
FIG. 2 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) transmit path 200. FIG. 3 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) receive path 300. In FIGS. 2 and 3, the OFDMA transmit path 200 is implemented in base station (BS) 102 and the OFDMA receive path 300 is implemented in subscriber station (SS) 116 for the purposes of illustration and explanation only. However, it will be understood by those skilled in the art that the OFDMA receive path 300 may also be implemented in BS 102 and the OFDMA transmit path 200 may be implemented in SS 116.
The transmitted signal in each downlink (DL) slot of a resource block is described by a resource grid of NRB DLNsc RB subcarriers and Nsymb DL OFDM symbols. The quantity NRB DL depends on the downlink transmission bandwidth configured in the cell and fulfills NRB min,DL≤NRB DL≤NRB max,DL, where NRB min,DL and NRB max,DL are respectively the smallest and largest downlink bandwidths supported. In some embodiments, subcarriers are considered the smallest elements that are capable of being modulated.
In case of multi-antenna transmission, there is one resource grid defined per antenna port. Each element in the resource grid for antenna port p is called a resource element (RE) and is uniquely identified by the index pair (k,l) in a slot where k=0, . . . , NRB DLNsc RB−1 and l=0, . . . , Nsymb DL−1 are the indices in the frequency and time domains, respectively. Resource element (k,l) on antenna port p corresponds to the complex value ak,l (p). If there is no risk for confusion or no particular antenna port is specified, the index p may be dropped.
UE-specific reference signals (or dedicated RSs: DRSs) are supported for single-antenna-port transmission on the Physical Downlink Shared Channel (PDSCH) and are transmitted on antenna port 5. The UE is informed by higher layers whether the UE-specific reference signal is present and is a valid phase reference for PDSCH demodulation or not. UE-specific reference signals are transmitted only on the resource blocks upon which the corresponding PDSCH is mapped.
FIG. 4 illustrates a diagram 400 of a base station 420 in communication with a plurality of mobile stations 402, 404, 406, and 408 according to an embodiment of this disclosure. As shown in FIG. 4, base station 420 simultaneously communicates with multiple of mobile stations through the use of multiple antenna beams, each antenna beam is formed toward its intended mobile station at the same time and same frequency. Base station 420 and mobile stations 402, 404, 406, and 408 are employing multiple antennas for transmission and reception of radio wave signals. The radio wave signals can be Orthogonal Frequency Division Multiplexing (OFDM) signals.
In this embodiment, base station 420 performs simultaneous beamforming through a plurality of transmitters to each mobile station. For instance, base station 420 transmits data to mobile station 402 through a beamformed signal 410, data to mobile station 404 through a beamformed signal 412, data to mobile station 406 through a beamformed signal 414, and data to mobile station 408 through a beamformed signal 416. In some embodiments of this disclosure, base station 420 is capable of simultaneously beamforming to the mobile stations 402, 404, 406, and 408. In some embodiments, each beamformed signal is formed toward its intended mobile station at the same time and the same frequency. For the purpose of clarity, the communication from a base station to a mobile station may also be referred to as downlink communication, and the communication from a mobile station to a base station may be referred to as uplink communication.
FIG. 5 illustrates an SDMA scheme according to an embodiment of this disclosure. As shown in FIG. 5, base station 420 is equipped with 8 transmit antennas while mobile stations 402, 404, 406, and 408 are each equipped two antennas. In this example, base station 420 has eight transmit antennas. Each of the transmit antennas transmits one of beamformed signals 410, 502, 504, 412, 414, 506, 416, and 508. In this example, mobile station 402 receives beamformed transmissions 410 and 502, mobile station 404 receives beamformed transmissions 504 and 412, mobile station 406 receives beamformed transmissions 506 and 414, and mobile station 408 receives beamformed transmissions 508 and 416.
In Release 8 LTE systems, a UE is required to perform channel estimation based on common reference signals (CRSs) over the entire bandwidth. Once channel estimation is performed, the UE performs demodulation based on different transmission modes indicated by the different formats of the downlink control information. For example, when downlink spatial multiplexing is performed, downlink control information (DCI) format 2 is used, and the UE performs demodulation based on the resource assignment and TPMI (transmission PMI) contained in the DCI format. For example, in 3GPP TS 36.212 v 8.8.0, “E-UTRA, Multiplexing and Channel Coding,” December 2009, the definition of TPMI is defined in Table 5.3.3.1.5-4 (2 antenna ports) and in Table 5.3.3.1.5-5 (4 antenna ports) of Section 5.3.3.1.5, which is hereby incorporated by reference into the present application as if fully set forth herein.
The eNodeB indicates whether it is wideband precoding or subband precoding to UE based on the UE's feedback, and the UE performs downlink demodulation accordingly.
In LTE-Advanced (LTE-A) systems, the downlink demodulation is based on dedicated reference signals (DRS), a.k.a. UE-specific reference signals (UE-RS).
In LTE-Advanced systems, demodulation of the data channel is based precoded UE-specific reference signal, that is, the reference signals are precoded using the same precoder as the data channel as described in R1-090529 “Way forward on CoMP and MIMO DL RS,” Outcome of ad hoc discussions, January 2009, and R1-091066 “Way forward on downlink reference signals for LTE-A,” CATT, CMCC, Ericsson, Huawei, LGE, Motorola, Nokia, Nokia Siemens Networks, Nortel, Panasonic, Philips, Qualcomm Europe, Samsung, Texas Instruments, March 2009, both of which are hereby incorporated by reference into the present application as if fully set forth herein.
RSs targeting PDSCH demodulation (for LTE-A operation) are UE specific and are transmitted only in scheduled RBs and the corresponding layers. Different layers can target the same or different UEs. The design principle is an extension of the concept of Rel-8 UE-specific RS (used for beamforming) to multiple layers. RSs on different layers are mutually orthogonal. RSs and data are subject to the same precoding operation, and complementary use of Rel-8 CRS by the UE is not precluded.
In R1-094413, “Way forward on the details of DCI format 2B for enhanced DL transmission,” 3GPP RAN1#58bis, Miyazaki, October 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, an agreement has been made for DCI format 2B as follows:
The DCI Format 2B is based on DCI Format 2A;
1 bit is added for the source channel identifier (SC-ID);
The Swap Flag is removed;
For rank 1 transmission, the new data indicator (NDI) bit of the disabled transport block is re-used to indicate port information. A value of 0 is used to indicate an enabled transport block (TB) associated with port 7. A value of 1 is used to indicate an enabled transport block associated with port 8; and
For rank 2 transmission, TB1 is associated with port 7, and TB2 associated with port 8.
DCI format 2C can be constructed based on DCI format 2B for Rel. 10 transmission modes for facilitating dynamic SU- and MU-MIMO switching.
Since an eNodeB could potentially perform resource block (RB)-based precoding, the baseline granularity for channel estimation and demodulation is one RB. However, as disclosed in R1-093105, “UE-RS Patterns for LTE-A,” Qualcomm Europe, August 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, “RB-bundling” (bundle contiguous RBs together to perform channel estimation and demodulation) will help higher rank (i.e., rank 5 to 8) transmissions achieve adequate channel estimation accuracy along with a low overhead. It is also disclosed in R1-094575, “Discussion on DM-RS for LTE-Advanced,” Samsung, November 2009; R1-094438, “On Rel-10 DM RS design for rank 5-8,” Ericsson, ST-Ericsson, November 2009; and R1-094548, “Further investigation on DMRS design for LTE-A,” CATT, November 2009, which are hereby incorporated by reference into the present application as if fully set forth herein, that “RB bundling” could be used to balance the transmission power imbalance across OFDM symbols for some high rank DM-RS patterns.
FIGS. 6 and 6A through 6C collectively illustrate dedicated reference signal (DRS) patterns that support two and four layer transmissions according to an embodiment of this disclosure. The patterns in FIGS. 6A through 6C are related as indicated diagrammatically in FIG. 6. DRS patterns 601 and 603 illustrate pilot patterns that can support up to 2 layer transmissions. DRS REs labeled with 0,1 in DRS pattern 601 carry DRS for layer 0 and 1 with the RSs of the two layers code-division multiplexed (CDMed). Similarly, for DRS REs labeled with 2,3 in DRS pattern 603 carry DRS for layer 2 and 3 with the RSs of the two layers code-division multiplexed (CDMed).
In the two adjacent DRS REs labeled with 0,1, DRS symbols [r0 r1] for layer 0 are mapped to the two REs spread by a Walsh code [1 1], which results in [r0 r1], while DRS symbols r2 and r3 for layer 1 are mapped to the two REs spread by a Walsh code [1 −1], which results in [r2 −r3].
DRS pattern 605 illustrates a pilot pattern that can support up to four layer transmissions, where the DRS REs are again partitioned into two, those labeled with 0,1 and those with 2,3. In this pattern, the DRS REs labeled with 0,1 carry DRSs for layer 0 and 1 with the RSs of the two layers code-division multiplexed (CDMed), and the DRS REs labeled with 2,3 carry DRSs for layer 2 and 3 with the RSs of the two layers code-division multiplexed (CDMed).
FIG. 7 illustrates DRS patterns that support eight layer transmissions according to an embodiment of this disclosure. With regard to FIG. 7, REs labeled with alphabet X, where X is one of G, H, I, J, L, K, are used for carrying a number of DRS among the 8 DRS, where the number of DRS are CDM'ed. DRS pattern 701 is based on spreading factor 2 CDM across two time-adjacent REs with the same alphabet label. DRS pattern 703 is based on spreading factor 4 CDM across two groups of two time-adjacent REs with the same alphabet label. In this embodiment, the 8 antenna ports in a Rank-8 pattern are referred to as antenna ports 4, 5, 6, 7, 8, 9, 10, 11 in the sequel to distinguish them from the antenna ports in Rank-2 and Rank-4 patterns.
It is noted that in Rel-8 LTE, antenna ports 0, 1, 2, 3, 4, 5 are used for CRS, MBSFN RS and Rel-8 DRS. Hence, if the numbering convention extending Rel-8 LTE is followed, the new antenna port numbers will start from 6. Rank-2 pattern will have antenna ports 6, 7. Rank-4 pattern will have antenna ports 7, 8, 9, 10. Rank-8 pattern will have antenna ports 11, 12, 13, 14, 15, 16, 17, 18.
In one embodiment of DRS pattern 701, G carries DRS 4,5. H carries DRS 6,7. I carries DRS 8,9. J carries DRS 10,11. In one embodiment of DRS pattern 703, K carries DRS 4, 5, 6, 7; and L carries DRS 8, 9, 10, 11.
Each of the DM-RS patterns in FIGS. 6 and 7 is RB based. Accordingly, a UE could perform channel estimation and demodulation per RB. Alternatively, if RB bundling is supported, the UE could perform channel estimation and demodulation jointly across bundled RBs. In this way, the performance of channel estimation and demodulation can be improved.
RB-bundling gain is achieved only when an eNodeB performs the same downlink precoding vectors across the bundled RBs. Accordingly, a UE will have to perform channel estimation and demodulation over the bundled RBs jointly.
In other words, RB bundling will reduce the precoding flexibility since the precoding vectors within the bundled RBs have to be the same. This clearly suggests a trade-off between gains from increasing channel interpolation span in frequency versus losses from increasing frequency selective precoding granularity.
The advantage of RB bundling is that channel estimation performance is improved. However, the eNodeB cannot perform per RB encoding if the eNode B does not receive per RB feedback from the UE due to large overhead.
The advantage of not enabling RB bundling is that the eNodeB does not need the UE to feedback the PMI in order to perform channel estimation and demodulation. Instead, the eNodeB could rely upon uplink channel sounding in TDD systems. Furthermore, the eNodeB would have the flexibility to perform per RB pre-coding, which results in a higher pre-coding gain. However, the UE would then have to perform per RB channel estimation if the channel is very selective.
Therefore, it would be advantageous to be able to turn on or off the feature of RB-bundling depending on the channel conditions.
This disclosure provides systems and methods for enabling RB-bundling.
In some embodiments of this disclosure, an eNodeB transmits an indication to turn on or off the feature of RB-bundling to a UE.
When RB-bundling is turned on or enabled, the eNodeB performs the same downlink precoding vectors across a number of continuous RBs (the RB-bundling size), and the UE performs channel estimation and demodulation jointly on the bundled RBs. When RB-bundling is turning off or not enabled, the eNodeB performs downlink precoding on a per-RB basis, and the UE performs channel estimation and demodulation on a per RB basis as well.
The indication from the eNodeB to the UE to indicate whether RB bundling is enabled can be achieved several ways.
In some embodiments of this disclosure, a signaling from the eNodeB to UE indicating whether RB-bundling is enabled can be either semi-statically signaled through higher-layer signaling or dynamically signaled utilizing the available code-points in a DCI format. Furthermore, this signaling can be either explicit or implicit.
FIG. 8 illustrates a table 800 depicting the use of a one bit signaling to turn on or turn off resource block (RB) bundling according to an embodiment of this disclosure. In some embodiments of this disclosure, explicit signaling is used to turn on or off RB-bundling. For example, higher layer signaling is used to semi-statistically turn on or off RB bundling. For example, as shown in table 800, a one bit signaling can be used to semi-statistically turn on or turn off RB bundling. In this particular example, a first value of “0” indicates a first state in which RB bundling is turned off or disabled. A second value of “1” indicates a second state in which RB bundling is turned on or enabled. In another example, a sequence of bits is used to indicate states related to RB-bundling. One particular state indicated by this sequence of bits could be interpreted at the UE as turning off RB-bundling.
FIG. 9 illustrates a table 900 depicting the use of available downlink control information (DCI) code-points to turn on or turn off resource block RB bundling according to an embodiment of this disclosure. As shown in FIG. 9, available DCI code-points are also used to dynamically turn on or off RB bundling. For example, in DCI format 2X, a state is defined to turn on RB bundling by adding an additional field to DCI format 2C. In this particular example, a first state indicated by the additional field is a state in which RB bundling is turned on or enabled. A second state indicated by the additional field is a state in which RB bundling is turned off or disabled.
In some embodiments of this disclosure, implicit signaling is used to turn on or off RB-bundling. For example, whether RB bundling is enabled is based on a specific transmission mode, the DCI format used for a DL grant, the transmission scheme, and the radio network temporary identifier (RNTI) configuration.
For example, RB bundling is turned on or enabled if a UE is configured in Rel. 9 transmission mode (mode 8 in 3GPP 36.213), and if the UE received a physical downlink shared channel (PDSCH) packet scheduled with DCI format 2B.
In addition, if the UE receives a PDSCH packet scheduled with DCI format 1A and the associated transmission scheme is T×D (scheduled by semi-persistent scheduling (SPS) RNTI, and for the case when the physical broadcast channel (PBCH) signals multiple antenna ports), then RB bundling is turned off or disabled. If the UE receives a PDSCH packet scheduled with DCI format 1A, and the associated transmission scheme is single antenna port transmission (1. scheduled by SPS-RNTI, and for the case when the PBCH signals one antenna port; or 2. scheduled by cell radio network temporary identifier (C-RNTI)), then RB bundling is turned on or enabled.
For example, RB bundling is turned on or enabled if a UE is configured in Rel. 10 transmission mode for both SU and MU MIMO transmission, and if the UE received a PDSCH packet scheduled with DCI format 2C (DCI format in Rel-10 used to support 2 codeword MIMO transmission).
In addition, if the UE receives a PDSCH packet scheduled with DCI format 1A, and the associated transmission scheme is TxD (scheduled by SPS RNTI, and for the case when the PBCH signals multiple antenna ports), then RB bundling is turned off or disabled. If the UE receives a PDSCH packet scheduled with DCI format 1A, and the associated transmission scheme is single antenna port transmission (1. scheduled by SPS-RNTI, and for the case when the PBCH signals one antenna port; or 2. scheduled by C-RNTI), then RB bundling is turned on or enabled.
In other embodiments of this disclosure, RB bundling is turned on or off based on a specific feedback mode.
For example, if a UE is configured in Rel-9 and Rel-10 transmission modes and precoding matrix indicator/rank indicator (PMI/RI) feedback is configured, RB bundling is turned on or enabled. Otherwise, if the UE is configured in Rel-10 and beyond Rel-10 transmission modes and PMI/RI feedback is not configured, RB bundling is turned off or disabled. This is because the application scenario for configuring PMI/RI feedback is for frequency-division duplexing (FDD) systems while the application scenario for configuring PMI/RI feedback is not for time-division duplexing TDD systems. As discussed early in TDD systems, an eNodeB may obtain the channel state information using uplink sounding to perform frequency selective precoding. In this case, PRB bundling should be turned off accordingly. Furthermore, even in FDD systems, when the eNodeB decides to perform open-loop operations, the eNodeB will not configure the UE to feedback PMI/RI. Therefore, PRB bundling is also turned off in this case to allow for flexible operation at the eNodeB.
In another example, when wideband channel quality indicator (CQI)/PMI/RI (wideband CQI) feedback mode is configured, RB bundling is turned on or enabled. When subband CQI/PMI/RI (subband CQI) feedback mode is configured, RB bundling is turned off or disabled.
In other embodiments of this disclosure, an RB bundling on/off indication can also be realized through other system indications from the eNodeB to the UE. For example, RB bundling is enabled once the rank indicator (RI) is greater than a predetermined value.
In yet other embodiments of this disclosure, RB bundling is always on for demodulation using Rel. 9 or Rel. 10 UE-RS.
In order to perform different types of feedback reports, the UE is configured by the eNodeB in different feedback modes.
In some embodiments of this disclosure, RB-bundling is turned on or off based on the specific feedback mode configured by the eNodeB.
In one embodiment, RB-bundling is turned on or off based on the specific physical uplink control channel (PUCCH) feedback mode.
For example, RB bundling is turned on or enabled when when the UE is configured with PMI/RI reporting, and RB bundling is turned off or disabled when the UE is not configured with PMI/RI reporting.
Accordingly, when the UE is configured with PMI/RI reporting, the pre-coding granularity at the eNodeB is multiple physical resource blocks. That is the eNodeB performs the same pre-coding over a bundled resource block where a bundled resource block comprises multiple consecutive physical resource blocks.
Accordingly, when the UE is configured with PMI/RI reporting, the feedback granularity at the UE is set to multiple physical resource blocks such that the UE performs a channel estimation over a bundled resource block where a bundled resource block comprises multiple consecutive physical resource blocks.
Furthermore, when the UE is not configured with PMI/RI reporting, the pre-coding granularity at the eNodeB is a single physical resource block. That is the eNodeB performs pre-coding on a per physical resource block basis.
Accordingly, when the UE is not configured with PMI/RI reporting, the feedback granularity at the UE is set to a single physical resource block such that the UE performs a channel estimation on a per physical resource block basis.
In 3GPP TS 36.213 v 8.8.0, “E-UTRA, Physical Layer Procedures,” December 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, depending on the mode of periodic PUCCH feedback, RB bundling is turned on or enabled when the UE is configured in mode 1-1 and mode 2-1 of Table 7.2.2-1, and RB bundling is turned off or disabled when the UE is configured in mode 1-0 and mode 2-0.
In other embodiments of this disclosure, RB-bundling is turned on or off based on the based on the specific physical uplink shared channel (PUSCH) feedback mode.
In some embodiments of this disclosure, RB bundling is turned on or enabled when the UE is configured for “single PMI” and/or “multiple PMI” feedback, and RB bundling is turned off or disabled otherwise.
For example, RB bundling is turned on or enabled when the UE is configured for “single PMI” feedback, and RB bundling is turned off or disabled when the UE is configured for “No PMI” or “Multiple PMI” feedback.
In another example, RB bundling is turned on or enabled when the UE is configured for “single PMI” and “Multiple PMI” feedback, and RB bundling is turned off or disabled when the UE is configured for “No PMI” feedback.
In yet another example, RB bundling is turned on or enabled when the UE is configured for “Multiple PMI” feedback, and RB-bundling is turned off or disabled when the UE is configured for “No PMI” or “Single PMI” feedback.
For example, in 3GPP TS 36.213 v 8.8.0, “E-UTRA, Physical Layer Procedures,” December 2009, depending on the mode of aperiodic PUSCH feedback, RB bundling is turned on or enabled when the UE is configured in mode 3-1, and RB bundling is turned off or disabled in other feedback modes.
Once RB bundling is on or enabled, the granularity of the RB bundling has to be decided. As described earlier, the granularity of the RB bundling refers to the number of continuous PRBs used for channel estimation and demodulation.
In some embodiments of this disclosure, the RB-bundling granularity is set to be the unit of downlink resource allocation.
For example, in 3GPP TS 36.211 v 8.8.0, “E-UTRA, Physical channels and modulation,” December 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, the unit of downlink resource allocation is a resource block group (RBG), the size of RBG is dependent on the total system bandwidth. Therefore, the granularity of RB bundling can be the RBG size.
In other embodiments of this disclosure, the RB-bundling granularity is set to be the feedback granularity. The feedback granularity refers to the number of continuous RBs used by the UE to perform PMI/CQI/RI feedback.
For example, in 3GPP TS 36.211 v 8.8.0, “E-UTRA, Physical channels and modulation,” December 2009, feedback granularity for PUSCH feedback is the subband size defined in Section 7.2.1 for higher layer-configured subband feedback or UE-selected subband feedback. The feedback granularity for PUCCH feedback is defined in Section 7.2.2.
Therefore, in some embodiments, the RB-bundling granularity is set to be the subband size of the PUCCH feedback as a function of the total system bandwidth.
Alternatively, the RB-bundling granularity is related to the subband size of the PUSCH feedback.
For example, if RB bundling is turned on or enabled by the eNodeB configuring specific feedback mode, then the granularity of RB is the subband size of the corresponding feedback mode.
FIG. 10 illustrates subbands bundled together according to an embodiment of this disclosure. In yet other embodiments of this disclosure, the RB-bundling granularity is set to be jointly decided by the feedback granularity as well as the downlink resource allocation unit. Feedback granularity refers to the number of continuous RBs used by the UE to perform PMI/CQI/RI feedback.
For example when a UE is configured to have PUSCH “Multiple PMI” feedback, the eNodeB would perform downlink precoding based on the UE feedback subband size, and the UE would assume the RBs in the downlink resource allocation from the same subband bundled together as shown in FIG. 10.
In FIG. 10, a first subband 1010 includes a first RB bundle 1001, and a second subband 1020 includes a second RB bundle 1011. The first RB bundle 1001 and the second RB bundle 1011 are bundled together to form an RBG 1030.
In further embodiments of this disclosure, the RB-bundling granularity is set according to the subband size associated with the configured feedback modes.
In one such embodiment, the RB-bundling granularity depends on the configured PUSCH feedback modes.
For example, when wideband feedback is configured (mode 3-1), all the allocated RBs are bundled to perform channel estimation and demodulation.
In another example, when subband feedback is configured (mode 1-2, mode 2-2), RB bundling follows the subband size from the UE PUSCH feedback and/or the resource block group (RBG) size.
In a further example, when no PMI feedback is configured (mode 2-0, mode 3-0), RB bundling is turned off or disabled.
In some embodiments of this disclosure, the RB-bundling granularity depends on the configured PUCCH feedback modes.
For example, when wideband feedback is configured (mode 1-1, mode 2-1), RB bundling follows the subband size from the PUCCH feedback (higher layer configured feedback subband size) and/or the RBG size.
For example, when no PMI feedback is configured (mode 1-0, mode 2-0), RB bundling is turned off or disabled.
In some embodiments of this disclosure, the size of RB bundling is fixed.
For example, the size of RB bundling can be an even number to facilitate pattern rotation of UE-RS patterns for higher ranks as suggested in R1-094575, “Discussion on DM-RS for LTE-Advanced,” Samsung, November 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
FIG. 11 illustrates a DCI format 2C 1100 according to an embodiment of this disclosure. As shown in FIG. 11, in some embodiments of this disclosure, DCI format 2C 1100 is constructed by adding a new N3-bit for the indication of a combination of a selected DM RS pattern and a DM RS index set to DCI format 2B to support dynamic switching of SU- and MU-MIMO. A new data indicator (NDI) bit of a disabled transport block (TB) in DCI format 2B is used for indicating a DM RS index in the case of rank-1 indication in Rel-9 LTE. Hence, this embodiment uses codepoints constructed by a combination of an NDI bit of a disabled TB, such as the NDI bit in NDI field 1101 or NDI field 1103, and the new N3-bit in the N3-bit field 1105 for indicating rank-1 states in the restricted subset.
FIG. 12 illustrates a table 1200 depicting restricted subsets according to an embodiment of this disclosure. In some embodiments, a state in a restricted subset A is signalled by DCI format 2C, where the restricted subset A is shown in table 1200 as an example. In particular embodiments, the restricted subset A is constructed such that all possible states from Rank-2 patterns A and B are included, no Rank-2 states from Rank-4 are included, and only higher rank states are included from Rank-8.
The motivations of this subset restriction are that:
rank 1 and rank 2 transmissions are supported with minimal UE-RS overhead;
MU-MIMO is explicitly supported only for rank-1 with orthogonal UE-RS in Rank-2 and Rank-4 patterns; and
higher RS overhead is allowed only for ranks 3 or above.
FIG. 13 illustrates a table 1300 depicting a mapping of states in a restricted subset to codepoints in DCI format 2C according to an embodiment of this disclosure. FIG. 13 illustrates one example mapping of states in restricted subset A to codepoints in DCI format 2C.
FIG. 14 illustrates a table 1400 depicting restricted subsets according to another embodiment of this disclosure. In this embodiment, a state in restricted subset B is signalled by DCI format 2C. In this embodiment, the restricted subset B is constructed such that all possible states from Rank-2 patterns A and B are included, no Rank-2 states from Rank-4 are included, and only higher rank states are included from Rank-8. The motivations of this subset restriction are that:
MU-MIMO is explicitly supported for rank-1 with orthogonal UE-RS in Rank-2 and Rank-4 patterns;
MU-MIMO is explicitly supported for rank-2 with orthogonal UE-RS in Rank-4 pattern; and
higher RS overhead is allowed for ranks 2 or above.
FIG. 15 illustrates a table 1500 depicting a mapping of states in a restricted subset to codepoints in DCI format 2C according to another embodiment of this disclosure. FIG. 15 illustrates one example mapping of states in restricted subset B to codepoints in DCI format 2C.
FIG. 16 illustrates a method 1600 of operating a base station according to an embodiment of this disclosure. The method 1600 includes transmitting an indication of either a first feedback mode or a second feedback mode to a subscriber station (block 1601) and determining whether the first feedback mode is indicated by the indicator (block 1603). The method 1600 also includes setting the pre-coding granularity at the base station to multiple physical resource blocks in the frequency domain such that the base station performs the same pre-coding over a bundled resource block where a bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain if the first feedback mode is indicated by the indicator (block 1605) and setting the pre-coding granularity at the base station to one physical resource block if the second feedback mode is indicated by the indicator (block 1607). The method 1600 further includes receiving feedback from the subscriber station (block 1609).
FIG. 17 illustrates a method 1700 of operating a subscriber station according to an embodiment of this disclosure. The method 1700 includes receiving an indication of a first feedback mode or a second feedback mode from a base station (block 1701), and determining whether the first feedback mode is indicated by the indicator (block 1703). The method 1700 also includes performing a channel estimation over a bundled resource block where a bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain if the first feedback mode is indicated by the indicator (block 1705), and performing channel estimation only on a per physical resource block basis if the second feedback mode is indicated by the indicator (block 1707). The method 1700 further includes transmitting the channel estimation as feedback to the base station (block 1709).
FIG. 18 illustrates a method 1800 of operating a base station according to another embodiment of this disclosure. The method 1800 includes transmitting an indication of whether a subscriber station is configured with precoding matrix indicator/rank indicator (PMI/RI) reporting (block 1801), and determining whether the subscriber station is configured with PMI/RI reporting (block 1803). The method 1800 also includes setting the pre-coding granularity at the base station to multiple physical resource blocks in the frequency domain such that the base station performs the same pre-coding over a bundled resource block where a bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain if the subscriber station is configured with PMI/RI reporting (block 1805) and setting the pre-coding granularity at the base station to one physical resource block if the subscriber station is not configured with PMI/RI reporting (block 1807). The method 1800 further includes receiving feedback from the subscriber station (block 1809).
FIG. 19 illustrates a method 1900 of operating a subscriber station according to another embodiment of this disclosure. The method 1900 includes receiving from a base station an indication of whether the subscriber station is configured with precoding matrix indicator/rank indicator (PMI/RI) reporting (block 1901), and determining whether the subscriber station is configured with PMI/RI reporting (block 1903). The method 1900 also includes performing a channel estimation over a bundled resource block where a bundled resource block comprises multiple consecutive physical resource blocks in the frequency domain if the subscriber station is configured with PMI/RI reporting (block 1905), and performing channel estimation only on a per physical resource block basis if the subscriber station is not configured with PMI/RI reporting (block 1907). The method 1900 further includes transmitting the channel estimation as feedback to the base station (block 1909).
transmit information to a subscriber station configuring a transmission mode for the subscriber station and one of feedback with precoding matrix indicator/rank indicator (PMI/RI) by the subscriber station or feedback without PMI/RI by the subscriber station, and
set a same precoding to be applied to all scheduled physical resource blocks within a resource block group in response to feedback with PMI/RI by the subscriber station being configured and transmission mode 9 or 10 being configured for the subscriber station according to the information; and
a receive path circuitry configured to receive a feedback from the subscriber station.
transmit information for feedback to a subscriber station, and
set a same precoding to be applied to all scheduled physical resource blocks within a resource block group when
precoding matrix indicator/rank indicator (PMI/RI) feedback is configured according to the information for feedback, and
a transmission mode 9 or 10 is configured for the subscriber station; and
a receive path circuitry configured to receive a feedback from the subscriber station,
wherein the transmit path circuitry is configured to set a first precoding to be applied to one or more first physical resource blocks within the resource block group and a second precoding to be applied to one or more second physical resource blocks within the resource block group when either one of the PMI/RI feedback is not configured or the transmission mode 9 or 10 is not configured.
3. The base station of claim 2, wherein a number of the physical resource blocks within the resource block group is determined based on a system bandwidth.
4. The base station of claim 2, wherein the resource block group comprises at least one continuous physical resource block.
5. The base station of claim 2, wherein the transmit path circuitry is configured to set the same precoding to be applied to one physical resource block when the PMI/RI feedback is not configured.
transmitting information to a subscriber station configuring feedback with precoding matrix indicator/rank indicator (PMI/RI) by the subscriber station and a transmission mode for the subscriber station, wherein the transmission mode is 9 or 10 for the subscriber station;
setting a same precoding to be applied to all scheduled physical resource blocks within a resource block group in response to feedback with PMI/RI by the subscriber station being configured and transmission mode 9 or 10 being configured for the subscriber station according to the information; and
receiving a feedback from the subscriber station.
7. A method of operating a base station, the method comprising:
transmitting information for feedback to a subscriber station;
setting a same precoding to be applied to all scheduled physical resource blocks within a resource block group when both
setting a first precoding to be applied to one or more first physical resource blocks within the resource block group and a second precoding to be applied to one or more second physical resource blocks within the resource block group when either one of the PMI/RI feedback is not configured or the transmission mode 9 or 10 is not configured;
8. The method of claim 7, wherein a number of the physical resource blocks within the resource block group is determined based on a system bandwidth.
9. The method of claim 7, wherein the resource block group comprises at least one continuous physical resource block.
10. The method of claim 6, wherein the same precoding is set to be applied to one physical resource block when the PMI/RI feedback is not configured.
receive from a base station information configuring a transmission mode for the subscriber station and one of feedback with precoding matrix indicator/rank indicator (PMI/RI) by the subscriber station or feedback without PMI/RI by the subscriber station, and
identify that a same precoding is applied to all scheduled physical resource blocks within a resource block group in response to feedback with PMI/RI by the subscriber station being configured and a transmission mode 9 or 10 being configured for the subscriber station according to the information; and
a transmit path circuitry configured to transmit a feedback to the base station.
receive from a base station information for feedback, and
identify that a same precoding is applied to all scheduled physical resource blocks within a resource block group when both
a transmit path circuitry configured to transmit a feedback to the base station,
wherein the receive path circuitry is configured to identify that a first precoding is applied to one or more first physical resource blocks within the resource block group and that a second precoding is applied to one or more second physical resource blocks within the resource block group when either one of the PMI/RI feedback is not configured or the transmission mode 9 or 10 is not configured.
13. The subscriber station of claim 12, wherein a number of the physical resource blocks within the resource block group is determined based on a system bandwidth.
14. The subscriber station of claim 12, wherein the resource block group comprises at least one continuous physical resource block.
15. The subscriber station of claim 12, wherein the receive path circuitry is configured to identify that the same precoding is applied to one physical resource block when the PMI/RI feedback is not configured.
16. A method of operating a subscriber station receiving, from a base station, information configuring feedback with precoding matrix indicator/rank indicator (PMI/RI) by the subscriber station the method comprising:
identifying that a same precoding is applied to all scheduled physical resource blocks within a resource block group in response to feedback with PMI/RI by the subscriber station being configured and a transmission mode 9 or 10 being configured for the subscriber station according to the information; and
transmitting a feedback to the base station.
17. A method of operating a subscriber station, comprising:
receiving, from a base station, information for feedback;
identifying that a same precoding is applied to all scheduled physical resource blocks within a resource block group when both
a transmission mode 9 or 10 is configured for the subscriber station;
identifying that a first precoding is applied to one or more first physical resource blocks within the resource block group and that a second precoding is applied to one or more second physical resource blocks within the resource block group when either one of the PMI/RI feedback is not configured or the transmission mode 9 or 10 is not configured; and
18. The method of claim 17, wherein a number of the physical resource blocks within the resource block group is determined based on a system bandwidth.
19. The method of claim 17, wherein the resource block group comprises at least one continuous physical resource block.
20. The method of claim 17, wherein the same precoding is identified as applied to one physical resource block when the PMI/RI feedback is not configured.
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