Source: https://patents.google.com/patent/US9585136B2/en
Timestamp: 2019-05-25 07:57:25
Document Index: 207558588

Matched Legal Cases: ['Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 2010800364636', 'Application No. 10789762', 'Application No. 2014']

US9585136B2 - Method and system for indicating method used to scramble dedicated reference signals - Google Patents
US9585136B2
US9585136B2 US14/457,718 US201414457718A US9585136B2 US 9585136 B2 US9585136 B2 US 9585136B2 US 201414457718 A US201414457718 A US 201414457718A US 9585136 B2 US9585136 B2 US 9585136B2
US14/457,718
US20150036625A1 (en
2012-09-04 Priority to US13/603,083 priority patent/US8805448B2/en
2014-08-12 Priority to US14/457,718 priority patent/US9585136B2/en
2014-08-12 Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
2015-02-05 Publication of US20150036625A1 publication Critical patent/US20150036625A1/en
2017-02-28 Publication of US9585136B2 publication Critical patent/US9585136B2/en
This application is a continuation of U.S. Non-Provisional patent application Ser. No. 13/603,083 filed Sep. 4, 2012 and entitled “METHOD AND SYSTEM FOR INDICATING METHOD USED TO SCRAMBLE DEDICATED REFERENCE SIGNALS,” which is a continuation of U.S. Non-Provisional patent application Ser. No. 12/797,418 filed Jun. 9, 2010 and also entitled “METHOD AND SYSTEM FOR INDICATING METHOD USED TO SCRAMBLE DEDICATED REFERENCE SIGNALS,” and claims priority to U.S. Provisional Patent Application No. 61/268,950 filed Jun. 18, 2009 and entitled “SIGNALING FOR MULTI-USER MIMO TRANSMISSIONS IN WIRELESS COMMUNICATION SYSTEMS,” to U.S. Provisional Patent Application No. 61/269,886, filed Jun. 30, 2009 and entitled “SIGNALING METHODS FOR MULTI-USER MIMO TRANSMISSIONS IN WIRELESS COMMUNICATION SYSTEMS,” and to U.S. Provisional Patent Application No. 61/273,646 filed Aug. 6, 2009 and entitled “METHODS OF MULTI-USER MIMO TRANSMISSIONS IN WIRELESS COMMUNICATION SYSTEMS.” The content of the above-identified patent documents is hereby incorporated by reference.
FIGS. 6A and 6B illustrate reference signal patterns according to an embodiment of this disclosure;
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.
resource block assignment—┌log2(NRB DL(NRB DL+1))/2┐ bits, where all bits are set to 1;
Resource block assignment—┌log2 (NRB DL(NRB DL+1))/2┐ bits as defined in Section 7.1.6.3 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein;
for localized VRB, ┌log2(NRB DL(NRB DL+1))/2┐ bits provide the resource allocation;
if NRB DL<50 or if the format 1A CRC is scrambled by the random access radio network temporary identifier (RA-RNTI), the paging radio network temporary identifier (P-RNTI), or the system information radio network temporary identifier (SI-RNTI), ┌log2 (NRB DL(NRB DL+1))/2┐ bits provide the resource allocation.
−1 bit, the most significant bit (MSB) indicates the gap value, where value 0 indicates Ngap=Ngap,1 and value 1 indicates Ngap=Ngap,2; and
(┌log2(NRB DL(NRB DL+1))/2┐−1) bits provide the resource allocation.
the least significant bit of the TPC command indicates column NRB 1A of the transport block size (TBS) table defined in 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
if least significant bit is 0, then NRB 1A=2 else NRB 1A=3.
Downlink assignment index (this field is present in TDD for all the uplink—downlink configurations. This field is not present in FDD)—2 bits.
for resource allocation type 0 as defined in Section 7.1.6.1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, ┌NRB DL/P┐ bits provide the resource allocation.
For resource allocation type 1 as defined in Section 7.1.6.2 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, ┌NRB DL/P┐ bits of this field are used as a header specific to this resource allocation type to indicate the selected resource blocks subset.
(┌NRB DL/P┐−┌NRB DL/P−1) bits provide the resource allocation.
FIGS. 6A and 6B illustrate reference signal patterns according to an embodiment of this disclosure.
FIGS. 6A and 6B illustrate a 2-DRS pattern 610 and a 4-DRS pattern 620. Reference signal pattern 610 is an FDM/TDM pilot pattern that can support up to 2 layer transmissions. In reference pattern 610, the DRS REs are partitioned into two groups, the REs labeled with 0 and those with 1. The DRS REs labeled with 0 carry the DRS for layer 0, while the DRS REs labeled with 1 carry the DRS for layer 1.
Reference signal pattern 620 is a CDM/FDM pilot pattern that can support up to four layer transmissions, where DRS REs are again partitioned into two groups, those labeled with 0,1 and those with 2,3. For example, the DRS REs labeled with 0,1 carry the DRS for layers 0 and 1 where the two layers' RSs are code-division multiplexed (CDMed). In the two adjacent DRS REs labeled with 0,1, a DRS symbol r0 for layer 0 is mapped to the two REs spread by a Walsh code [1 1] that results in [r0 r0], while a DRS symbol r1 for layer 1 is mapped to the two REs spread by a Walsh code [1 −1] that results in [r1 −r1].
Using the first MU-MIMO method, the first UE would receive DRS 0 together with stream 0, while the second UE would receive DRS 1 together with stream 1. FIGS. 6A and 6B may be referred to for specific DRS patterns with FDM/TDM and with CDM. For example, in the FDM reference signal pattern 610, the first UE would receive the DRS in the RS REs with label 0, while the second UE would receive the DRS in the RS REs with label 1. If the first UE were to know that another UE is co-scheduled in the time-frequency resource where the first UE receives the downlink transmission, the first UE may try to estimate interfering channels in the other DRS REs (i.e., the RS REs with label 1) and use the interference information for demodulation.
Using the second MU-MIMO method, the first and second UEs' DRSs are not necessarily orthogonally multiplexed, and each UE assumes that there are no co-scheduled UEs in the time-frequency resource where the UEs receive the downlink transmission. In other words, in this MU-MIMO mode, the UEs expect SU-MIMO transmissions from the eNodeB. In one example, both the first and the second UEs would receive DRS in the same set of RS REs (e.g., RS REs with label 0 in FIGS. 6A and 6B).
c init=(└n s/2┘+1)·(2N ID cell+1)·216,
c init=(└n s/2┘g+1)·(2N ID cell+1)·216, [Eqn. 5]
The RS sequence generator 901 receives an initialization seed cinit,g for generating a pseudo-random sequence cg(i). The RS sequence generator 901 then uses the pseudo-random sequence cg (i) to generate a respective RS sequence for each of the antenna ports and sends each RS sequence to a respective resource element mapper 903-1 to 903-n for each of the antenna ports.
In one embodiment of this disclosure, an existing bit in a particular DL grant is reinterpreted to indicate these two states. This embodiment is also applicable for the DCI formats that can indicate two TBs, for example, the 2A′ DCI format mentioned above (which is based on 2A).
Please note that in table 1800, total rank>1 is a general formula. In the case of dual-layer beamforming, total rank is 2.
In a particular embodiment, the CW-to-layer mapping for the 1CW transmission case is modified such that, if the number of layers is 1 and the number of CWs is 1, then)
x (0)(i)=d (n _ cw)(i), and
M symb layer =M symb (n _ cw),
where n_cw is the enabled CW index, i=0, 1, . . . , Msymb layer−1 and Msymb layer=Msymb (n _ cw) is the number of modulation symbols in the enabled CW.
As shown in FIG. 31, a UE receives a transmission grant and a set of signals in a time-frequency resource assigned by the transmission grant from an eNodeB (block 3101). The UE then determines if the CW#0 in the transmission grant is enabled (block 3103). If the CW#0 in the transmission grant is enabled, the UE extracts signals from the REs for DRS#0 (block 3105). If the CW#1 in the transmission grant is enabled, the UE extracts signals from the REs for DRS#1 (block 3107). The UE then estimates the channels in the assigned time-frequency resource using the extracted signals (block 3109). The UE also demodulates the intended data stream in the assigned time-frequency resource using the estimated channels (block 3111). The UE also determines if the TB-to-CW swap flag in the transmission grant is set (block 3113). If the TB-to-CW swap flag in the transmission grant is set, the UE determines that CW#0 corresponds to TB#2 and CW#1 corresponds to TB#1 (block 3115). If the TB-to-CW swap flag in the transmission grant is not set, the UE determines that CW#0 corresponds to TB#1 and CW#1 corresponds to TB#2 (block 3117).
a receive path circuitry configured to receive a downlink transmission grant and a Physical Downlink Shared CHannel (PDSCH) from a base station, the downlink transmission grant using at least one of a cell radio network temporary identifier (C-RNTI) and a semi-persistent scheduling (SPS)C-RNTI,
wherein, if the downlink transmission grant is acquired using the C-RNTI, and if the downlink transmission grant utilizes a first downlink control information (DCI) format, then the receive path circuitry is configured to determine that transmission of the PDSCH by the base station uses a transmit diversity transmission scheme or a single antenna-port scheme,
if the downlink transmission grant is acquired using the C-RNTI, and if the downlink transmission grant utilizes a second DCI format, then the receive path circuitry is configured to determine that transmission of the PDSCH by the base station uses a dual-dedicated reference signal (DRS) port transmission scheme or a single-DRS port transmission scheme,
if the downlink transmission grant is acquired using the SPS C-RNTI, and if the downlink transmission grant utilizes the first DCI format, then the receive path circuitry is configured to determine that transmission of the PDSCH by the base station uses a single-DRS port transmission scheme, and
if the downlink transmission grant is acquired using the SPS C-RNTI, and if the downlink transmission grant utilizes the second DCI format, then the receive path circuitry is configured to determine that transmission of the PDSCH by the base station uses a single-DRS port transmission scheme.
2. The subscriber station in accordance with claim 1, wherein, if the downlink transmission grant utilizes the first DCI format, a search space for a Physical Downlink Control CHannel (PDCCH) includes both common channels and user equipment (UE)-specific channels by C-RINTI, and wherein, if the downlink transmission grant utilizes the second DCI format, the search space for the PDCCH includes only the UE-specific channels by C-RINTI.
3. The subscriber station in accordance with claim 1, wherein a first value for a new data indicator (NDI) field of a disable transport block indicates that the single-DRS port transmission utilizes a first antenna port, and wherein a second value for the NDI field indicates that the single-DRS port transmission utilizes a second antenna port.
4. The subscriber station in accordance with claim 1, wherein if a dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the subscriber station is further configured to determine a DRS port index of an enabled transport block in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
5. The subscriber station in accordance with claim 1, wherein if a dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the subscriber station is further configured to determine a DRS port index of an enabled codeword in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
receiving a downlink transmission grant and a Physical Downlink Shared CHannel (PDSCH) from a base station, the downlink transmission grant using at least one of a cell radio network temporary identifier (C-RNTI) and a semi-persistent scheduling (SPS)C-RNTI,
wherein, if the downlink transmission grant is acquired using the C-RNTI, and if the downlink transmission grant utilizes a first downlink control information (DCI) format, then determining that transmission of the PDSCH by the base station uses a transmit diversity transmission scheme or a single antenna-port scheme,
if the downlink transmission grant is acquired using the C-RNTI, and if the downlink transmission grant utilizes a second DCI format, then determining that transmission of the PDSCH by the base station uses a dual-dedicated reference signal (DRS) port transmission scheme or a single-DRS port transmission scheme,
if the downlink transmission grant is acquired using the SPS C-RNTI, and if the downlink transmission grant utilizes the first DCI format, then determining that transmission of the PDSCH by the base station uses a single-DRS port transmission scheme, and
if the downlink transmission grant is acquired using the SPS C-RNTI, and if the downlink transmission grant utilizes the second DCI format, then determining that transmission of the PDSCH by the base station uses a single-DRS port transmission scheme.
7. The method in accordance with claim 6, wherein, if the downlink transmission grant utilizes the first DCI format, a search space for a Physical Downlink Control CHannel (PDCCH) includes both common channels and user equipment (UE)-specific channels by C-RINTI, and wherein, if the downlink transmission grant utilizes the second DCI format, the search space for the PDCCH includes only the UE-specific channels by C-RINTI.
8. The method in accordance with claim 6, wherein a first value for a new data indicator (NDI) field of a disable transport block indicates that the single-DRS port transmission utilizes a first antenna port, and wherein a second value for the NDI field indicates that the single-DRS port transmission utilizes a second antenna port.
9. The method in accordance with claim 6, wherein if a duallayer beamforming format is used to indicate a single-DRS port transmission scheme, then determining a DRS port index of an enabled transport block in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
10. The method in accordance with claim 6, wherein if a dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, then determining a DRS port index of an enabled codeword in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
a transmit path circuitry configured to scramble cyclic redundancy check (CRC) bits of a downlink control information (DCI) of either a first or a second DCI format using either a cell radio network temporary identifier (C-RNTI) for dynamic scheduling or a semi-persistent scheduling (SPS)C-RNTI for semi-persistent scheduling,
the transmit path circuitry further configured to transmit the DCI and a Physical Downlink Shared CHannel (PDSCH) scheduled by the DCI to a subscriber station,
wherein, if the C-RNTI is used to scramble the CRC bits and the DCI is of the first DCI format, then the PDSCH is transmitted using a transmit diversity scheme or a single antenna-port scheme;
if the C-RNTI is used to scramble the CRC bits and the DCI is of the second DCI format, then the PDSCH is transmitted using a dual-dedicated reference signal (DRS) port transmission scheme or a single-DRS port transmission scheme,
if the SPS C-RNTI is used to scramble the CRC bits and the DCI is of the first DCI format, then the PDSCH is transmitted using a single-DRS port transmission scheme;
if the SPS C-RNTI is used to scramble the CRC bits and the DCI is of the second DCI format, then the PDSCH is transmitted using a single-DRS port transmission scheme.
12. The base station in accordance with claim 11, wherein, if the downlink transmission grant utilizes the first DCI format, a search space for a Physical Downlink Control CHannel (PDCCH) includes both common channels and user equipment (UE)-specific channels by C-RINTI, and wherein, if the downlink transmission grant utilizes the second DCI format, the search space for the PDCCH includes only the UE-specific channels by C-RINTI.
13. The base station in accordance with claim 11, wherein a first value for a new data indicator (NDI) field of a disable transport block indicates that the single-DRS port transmission utilizes a first antenna port, and wherein a second value for the NDI field indicates that the single-DRS port transmission utilizes a second antenna port.
14. The base station in accordance with claim 11, wherein the transmit path circuitry configured, if the SPS C-RNTI is used to scramble the CRC bits, to generate a downlink transmission grant using the DCI format that is the fallback format to indicate a single-DRS port transmission scheme, and to transmit the downlink transmission grant in a common or user equipment-specific search space of the Control Channel Elements (CCE) domain.
15. The base station in accordance with claim 11, wherein the transmit path circuitry configured to generate a downlink transmission grant using the DCI format that is the dual-layer beamforming format to indicate a dual-DRS port transmission scheme or a single-DRS port transmission scheme, and to transmit the downlink transmission grant in a user equipment-specific search space of the Control Channel Elements (CCE) domain.
scrambling cyclic redundancy check (CRC) bits of a downlink control information (DCI) of either a first or a second DCI format using either a cell radio network temporary identifier (C-RNTI) for dynamic scheduling or a semi-persistent scheduling (SPS)C-RNTI for semi-persistent scheduling; and
transmitting the DCI and a Physical Downlink Shared CHannel (PDSCH) scheduled by the DCI to a subscriber station,
17. The method in accordance with claim 16, wherein, if the downlink transmission grant utilizes the first DCI format, a search space for a Physical Downlink Control CHannel (PDCCH) includes both common channels and user equipment (UE)-specific channels by C-RINTI, and wherein, if the downlink transmission grant utilizes the second DCI format, the search space for the PDCCH includes only the UE-specific channels by C-RINTI.
18. The method in accordance with claim 16, wherein a first value for a new data indicator (NDI) field of a disable transport block indicates that the single-DRS port transmission utilizes a first antenna port, and wherein a second value for the NDI field indicates that the single-DRS port transmission utilizes a second antenna port.
19. The method in accordance with claim 16, further
comprising: if the SPS C-RNTI is used to scramble the CRC bits, generating a downlink transmission grant using the DCI format that is the fallback format to indicate a single-DRS port transmission scheme, and transmitting the downlink transmission grant in a common or user equipment-specific search space of the Control Channel Elements (CCE) domain.
20. The method in accordance with claim 16, further comprising: generating a downlink transmission grant using the DCI format that is the dual-layer beamforming format to indicate a dual-DRS port transmission scheme or a single-DRS port transmission scheme, and transmitting the downlink transmission grant in a user equipment-specific search space of the Control Channel Elements (CCE) domain.
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